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Malpractice or masterful practice?Navigating vicarious liability in healthcare
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作者 Satvik N Pai Naveen Jeyaraman +1 位作者 Madhan Jeyaraman Swaminathan Ramasubramanian 《World Journal of Clinical Cases》 SCIE 2025年第2期10-13,共4页
In the intricate landscape of healthcare,vicarious liability looms large,shaping the responsibilities and actions of healthcare practitioners and administrators alike.Illustrated by a poignant scenario of a medication... In the intricate landscape of healthcare,vicarious liability looms large,shaping the responsibilities and actions of healthcare practitioners and administrators alike.Illustrated by a poignant scenario of a medication error,this article navigates the complexities of vicarious liability in healthcare.It explains the legal basis and ramifications of this theory,emphasizing its importance in fostering responsibility,protecting patient welfare,and easing access to justice.The paper explores the practical effects of vicarious responsibility on day-to-day operations,leadership practices,and decision-making processes via the eyes of senior consultants,junior doctors,and hospital administrators.Through comprehensive insights and real-world examples,it underscores the imperative of fostering a culture of accountability,communication,and quality care to navigate the intricate web of liabilities inherent in modern healthcare. 展开更多
关键词 Vicarious liability Healthcare RESPONSIBILITY LITIGATION Patient welfare
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Determination of Liability for Violation of “Sexual Autonomy” and Compensation for Mental Damages
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作者 姚邢 JIANG Lin(Translated) 《The Journal of Human Rights》 2024年第2期347-372,共26页
At the legislative level in China,there has been insufficient theoretical preparation to explicitly include“sexual autonomy”within the scope of general personality rights.In handling the increasing number of dispute... At the legislative level in China,there has been insufficient theoretical preparation to explicitly include“sexual autonomy”within the scope of general personality rights.In handling the increasing number of disputes related to violations of“sexual autonomy,”judicial biases have emerged during the trial process when courts determine the attribute of the right to“sexual autonomy.”This situation necessitates a clear legal analysis of the concept and attributes of“sexual autonomy”to establish its essential attribute as a personality right,and,from the perspective of legal doctrine,enable the justification of the right to“sexual autonomy”as either a general personality right or other personality interests,thereby providing theoretical support for courts to“adjudicate according to law.”By delineating and categorizing instances of violations of“sexual autonomy,”the constitutive elements and fundamental characteristics of such violations can be clarified.By examining the legal norms governing civil litigation and civil litigation associated with criminal cases concerning violations of“sexual autonomy,”the responsibility determination,remedies,and existing regulatory loopholes regarding violations of“sexual autonomy,”especially in cases involving both criminal and civil matters,can be defined.Based on this foundation,the legal basis,determination mechanism,and compensation standards for claiming compensation for mental damages resulting from violations of“sexual autonomy”can be elucidated. 展开更多
关键词 sexual autonomy personality rights VIOLATIONS liability investigation
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Risk Assessment of an Environmental Liability in the Commercialization of Hydrocarbons-A Secondary Publication
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作者 Yamila Navarro Sosa JoséCarlos Rojas Acosta +2 位作者 Lester Rivas Trasancos Carlos C.Cañete Pérez Yuletsis Díaz Rodríguez 《Journal of World Architecture》 2024年第2期108-117,共10页
The risk analysis evaluates the probability of occurrence with the impact of said risks.In the hydrocarbon sector,an environmental liability is an improperly abandoned facility,soil contaminated by spills or others.Th... The risk analysis evaluates the probability of occurrence with the impact of said risks.In the hydrocarbon sector,an environmental liability is an improperly abandoned facility,soil contaminated by spills or others.The objective of this work is to define a risk management plan.The characterization of the residue and the area was carried out.Hazardous events were identified:overflow spill,soil contamination by infiltration,as well as radiant heat and suffocating and toxic fumes from a fire.The matrix method was applied considering the probability of occurrence against vulnerability.The danger of infiltration implied a high level of risk.The risk management plan was drawn up,its main action being the liquidation of the pool and the sanitation of the area. 展开更多
关键词 Hazardous events Environmental liability Waste Risk VULNERABILITY
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Spontaneous combustion liability of coal and coal-shale: a review of prediction methods 被引量:11
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作者 M.Onifade B.Genc 《International Journal of Coal Science & Technology》 EI 2019年第2期151-168,共18页
This study presents a review of the various methods to predict the spontaneous combustion liability of coal and coal-shale. The relative propensity of coal to undergo self-heating can be established by different metho... This study presents a review of the various methods to predict the spontaneous combustion liability of coal and coal-shale. The relative propensity of coal to undergo self-heating can be established by different methods. These methods are well established in their usage, but the fact that no particular test method has become a standard to predict the spontaneous combustion liability indicates that doubt still exists as to the validity of all of them. The underlying principle of all the tests is that the more readily the coal undergoes exothermic oxidation, the more liable it is to self-heat. Comprehensive studies that centres on the international position on research being conducted by academics, different research institutes and industries on spontaneous combustion of coal and coal mine fires were evaluated. Relationships between the geochemical analysis (proximate and ultimate analysis, forms of sulphur, petrographic properties, X-ray diffraction and X-ray fluorescence) and spontaneous combustion testing methods (numerical and experimental approaches) used to predict the spontaneous combustion liability of coal were reviewed. The combination of these tests provides a better understanding of the mechanism that controls the spontaneous combustion phenomena. However, irrespective of the extensive studies that have been conducted over time, spontaneous combustion is still a major problem in the coal value chain. 展开更多
关键词 Coalfields SPONTANEOUS combustion liability MACERALS Numerical and GEOCHEMICAL analysis
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Replenishment policy and inventory optimization for supply-hub with liability period consideration 被引量:1
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作者 李果 黄焜 +1 位作者 姚琦 马士华 《Journal of Central South University》 SCIE EI CAS 2013年第10期2914-2921,共8页
A replenishment decision-making model for supply-hub is firstly established from the angle of supplier, and optimal replenishment decision of the supplier is analyzed. Then, inventory optimization model for supply-hub... A replenishment decision-making model for supply-hub is firstly established from the angle of supplier, and optimal replenishment decision of the supplier is analyzed. Then, inventory optimization model for supply-hub is formulated from the angle of the manufacturer, and the optimization algorithm for obtaining optimal inventory levels is given. The result shows that liability period decides the share of the inventory cost between two sides in supply chain. With the increase of liability period, the service level has been quickly reduced even though the manufacturer's cost has been cut down by transferring the inventory cost to the supplier. As to the safety inventory, if the lower bound of components safety inventory increases, the supplier's cost will rise up more slowly than the liability period does, while the service levels increases as the safety inventory's lower bound is raised. 展开更多
关键词 liability PERIOD SUPPLY-HUB REPLENISHMENT policy INVENTORY OPTIMIZATION lead time
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Proposing a novel comprehensive evaluation model for the coal burst liability in underground coal mines considering uncertainty factors 被引量:7
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作者 Jian Zhou Chao Chen +1 位作者 Mingzheng Wang Manoj Khandelwal 《International Journal of Mining Science and Technology》 SCIE EI CAS CSCD 2021年第5期799-812,共14页
Coal burst is a severe hazard that can result in fatalities and damage of facilities in underground coal mines.To address this issue,a robust unascertained combination model is proposed to study the coal burst hazard ... Coal burst is a severe hazard that can result in fatalities and damage of facilities in underground coal mines.To address this issue,a robust unascertained combination model is proposed to study the coal burst hazard based on an updated database.Four assessment indexes are used in the model,which are the dynamic failure duration(DT),elastic energy index(WET),impact energy index(KE)and uniaxial compressive strength(RC).Four membership functions,including linear(L),parabolic(P),S and Weibull(W)functions,are proposed to measure the uncertainty level of individual index.The corresponding weights are determined through information entropy(EN),analysis hierarchy process(AHP)and synthetic weights(CW).Simultaneously,the classification criteria,including unascertained cluster(UC)and credible identification principle(CIP),are analyzed.The combination algorithm,consisting of P function,CW and CIP(P-CW-CIP),is selected as the optimal classification model in function of theory analysis and to train the samples.Ultimately,the established ensemble model is further validated through test samples with 100%accuracy.The results reveal that the hybrid model has a great potential in the coal burst hazard evaluation in underground coal mines. 展开更多
关键词 Coal burst liability(CBL) Unascertained measurement(UM) Analysis hierarchy process Information entropy Synthetic weights Comprehensive evaluation
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Analysis of spontaneous combustion liability indices and coal recording standards/basis 被引量:2
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作者 A.R.Gbadamosi M.Onifade +1 位作者 B.Genc S.Rupprecht 《International Journal of Mining Science and Technology》 SCIE EI CSCD 2020年第5期723-736,共14页
The characterization of the physical and chemical properties of coal on a standard provides an understanding of its characteristics towards spontaneous combustion.The trend of linear relationships between coal recordi... The characterization of the physical and chemical properties of coal on a standard provides an understanding of its characteristics towards spontaneous combustion.The trend of linear relationships between coal recording standards(%air-dried(ad),%dry(db)and%dry ash free(daf)basis)of 30 selected coal samples from the Witbank coalfields and spontaneous combustion liability indices were evaluated.The spontaneous combustion liability indices of these samples were evaluated by crossing point temperature(XPT),Stage II Slope,FCC(Feng,Chakravorty,Cochrane)and the Wits-Ehac tests,while the coal properties were determined from the proximate and ultimate analyses.The results obtained from these coal properties were related to different liability indices to develop trends of linear relationships using regression analysis.The ad basis indicated higher correlation coefficients than the db and daf basis for the XPT and FCC index,while the daf showed higher correlation coefficients than the ad and db basis for the Wits-Ehac index.It was found that the trend of linear relationships of these coal properties differs from one liability index to the next.The XPTs showed a better trend followed by the Stage II Slope on the coal properties among the spontaneous combustion liability indices evaluated. 展开更多
关键词 Coal basis Correlation analysis liability indices Spontaneous combustion
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Reliability of a Tissue Microarray in Detecting Thyroid Transcription Factor-1 Protein in Lung Carcinomas 被引量:1
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作者 Xiaoyan Bai Hong Shen 《Chinese Journal of Clinical Oncology》 CSCD 2007年第1期9-15,共7页
OBJECTIVE To compare the expression of the thyroid transcription factor-1 (TTF-1) in human normal adult type Ⅱ alveolar epithelial cells, embryonic pneumocytes and cancer cells of lung carcinoma and metastatic lymp... OBJECTIVE To compare the expression of the thyroid transcription factor-1 (TTF-1) in human normal adult type Ⅱ alveolar epithelial cells, embryonic pneumocytes and cancer cells of lung carcinoma and metastatic lymph nodes using a tissue microarray (TMA) along with paired conventional full sections, and to investigate the reliability of tissue microarrays in detecting protein expression in lung carcinoma. METHODS A lung carcinoma TMA including 765 cores was constructed. TTF-1 protein expression in both TMA and paired conventional full sections were detected by the immunohistochemical SP method using a monoclonal antibody to TTF-1. A PU (Positive Unit) of TTF-1 protein was assessed quantitatively by the Leica Q500MC image analysis system with results from the paired conventional full sections as controls. RESULTS There was no significance between TMA and paired conventional full sections in TTF-1 expression in different nuclei of the lung tissue. CONCLUSION TTF-1 protein expression in lung carcinoma detected by TMA was highly concordant with that of paired full sections. TMA is a reliable method in detecting protein expression. 展开更多
关键词 lung carcinoma transcription factor-1(TTF-1) liability. tissue microarray thyroid immunohistochemistry reliability.
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Trends in the International Regime of Liability and Compensation for Oil Pollution Damage
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作者 Zhang Qiurong(张秋荣) 《Journal of Donghua University(English Edition)》 EI CAS 2001年第4期128-132,共5页
Since the entry into force of the International Convention on liability and compensation for oil spill damage, there have been many discussions on the improvement of this regime. Based on the existing tworegimes, the ... Since the entry into force of the International Convention on liability and compensation for oil spill damage, there have been many discussions on the improvement of this regime. Based on the existing tworegimes, the writer tried to analysis the advantages of the new regimes and foresee the trends of the international regime of liability and compensation for oil pollution damage. 展开更多
关键词 regime OIL pollution liability and COMPENSATION
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The Emerging Importance of Professional Liability Insurance Coverage for Pharmacists
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作者 Sumera Kazim Albert Wertheimer 《Pharmacology & Pharmacy》 2014年第2期171-174,共4页
As the responsibilities for clinical pharmacists have increased in recent years, the pharmacy practitioner finds the need for professional liability insurance. This report describes the practice changes under way and ... As the responsibilities for clinical pharmacists have increased in recent years, the pharmacy practitioner finds the need for professional liability insurance. This report describes the practice changes under way and describes the malpractice insurance options available to current pharmacy practitioners. 展开更多
关键词 PHARMACY Professional liability PHARMACIST MALPRACTICE INSURANCE
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A Liability Division Method for Harmonic Pollution Based on Line-Transferred Power Components
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作者 Jianchun Peng Jun Zhou Hui Jiang 《Journal of Power and Energy Engineering》 2015年第4期262-268,共7页
The existing liability division methods for harmonic pollution are either inexplicit or incomplete in physical meaning. To compensate these defects, two new methods are proposed based on line-transferred power compone... The existing liability division methods for harmonic pollution are either inexplicit or incomplete in physical meaning. To compensate these defects, two new methods are proposed based on line-transferred power components in this paper. At first, all harmonic sources are represented by ideal equivalent current source, line current components and bus voltage components of a source are determined by stimulation of this source with all other sources disabled. Then, the line-trans- ferred power component owing to a source under all sources action together is determined by the theory of line-transferred power components, and called source’s line-transferred power component. At last, the liability of a source for line-end harmonic pollution is divided by two methods: the ration of the source’s line-transferred active power component to the total line-transferred power, and the ration of projection of the source’s line-transferred complex power component to absolute value of the total line-transferred complex power. These two methods are taken into account not only harmonic voltage but also harmonic current in the liability division. Simulation results show that the proposed liability division method based on active power component is the most effective and ideal one. 展开更多
关键词 HARMONIC POLLUTION liability DIVISION Line-Transferred POWER POWER Component Grid
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Rapid genetic screening of Charcot-Marie-Tooth disease type 1A and hereditary neuropathy with liability to pressure palsies patients
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作者 Xiaobo Li Xiaohong Zi +9 位作者 Lin Li Yajing Zhan Shunxiang Huang Jin Li Xuning Li Xigui Li Zhengmao Hu Kun Xia Beisha Tang Ruxu Zhang 《Neural Regeneration Research》 SCIE CAS CSCD 2012年第32期2522-2527,共6页
We used the allele-specific PCR-double digestion method on peripheral myelin protein 22 (PMP22) to determine duplication and deletion mutations in the proband and family members of one family with Charcot-Marie-Toot... We used the allele-specific PCR-double digestion method on peripheral myelin protein 22 (PMP22) to determine duplication and deletion mutations in the proband and family members of one family with Charcot-Marie-Tooth disease type 1 and one family with hereditary neuropathy with liability to pressure palsies. The proband and one subclinical family member from the Charcot-Marie-Tooth disease type 1 family had a PMP22 gene duplication; one patient from the hereditary neuropathy with liability to pressure palsies family had a PMP22 gene deletion. Electron microscopic analysis of ultrathin sections of the superficial peroneal nerve from the two probands demonstrated demyelination and myelin sheath hyperplasia, as well as an 'onion-like' structure in the Charcot-Marie-Tooth disease type 1A patient. We observed an irregular thickened myelin sheath and 'mouse-nibbled'-Iike changes in the patient with hereditary neuropathy with liability to pressure palsies. In the Charcot-Marie-Tooth disease type 1A patient, nerve electrophysiological examination revealed moderate-to-severe reductions in the motor and sensory conduction velocities of the bilateral median nerve, ulnar nerve, tibial nerve, and sural nerve. Moreover, the compound muscle action potential amplitude was decreased. In the patient with hereditary neuropathy with liability to pressure palsies, the nerve conduction velocity of the bilateral tibial nerve and sural nerve was moderately reduced, and the nerve conduction velocity of the median nerve and ulnar nerve of both upper extremities was slightly reduced. 展开更多
关键词 Charcot-Marie-Tooth disease hereditary neuropathy with liability to pressure palsies peripheral myelin protein 22 gene mutation PCR-double digestion method myelin sheath action potentia neuropathology neural regeneration
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On Environmental Quality Standards and Finding of Liability for Environmental Pollution Torts
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作者 You Mingqing Yi Xin 《Contemporary Social Sciences》 2019年第5期29-47,共19页
Though bearing technical and legal attributes,environmental quality standards are neither rules nor regulatory documents.With the binding force coming from the legal norms where they are cited,environmental quality st... Though bearing technical and legal attributes,environmental quality standards are neither rules nor regulatory documents.With the binding force coming from the legal norms where they are cited,environmental quality standards are designed and implemented as a yardstick for measuring environmental quality.They also play a role in the functions of goal setting,merit appraisals,inspiration,supervision and accountability in conjunction with the legal norms and administrative plans where they are cited.Characteristically,environmental quality standards adopt sort management in concept,take holistic values and methodologies,establish phased goals and accept the resulting policy choices.These standards are not applicable to determine tort liability caused by environmental pollution from the perspective of legal norms but provide limited evidence for finding the same in the view of factual analysis by delivering scientific support to prove negative effects on the environment.Hence,environmental quality standards do contribute to finding torts,thus making the production of evidence less difficult.Also,they can be used to prove the relevance between torts and damage. 展开更多
关键词 ENVIRONMENTAL quality standards ENVIRONMENTAL POLLUTION liability FACTS norms
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International Law on Liability and Compensation in the Offshore Oil & Gas Industry
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作者 Erik ter Brake 《Journal of Shipping and Ocean Engineering》 2016年第3期185-190,共6页
Offshore oil and gas exploration and production comes with risk of release of hydrocarbons in to sea. Today, the probability of such an event is relatively low, but the consequences are nevertheless significant and ca... Offshore oil and gas exploration and production comes with risk of release of hydrocarbons in to sea. Today, the probability of such an event is relatively low, but the consequences are nevertheless significant and can cover a vast geographical area. As such, it raises the question as to whether liability and compensation in oil & gas related incidents should be covered under international law. Current international legislation addresses the issue mainly in terms of shipping. This paper attempts to shed light on the topic in relation to oil and gas exploration whilst investigating notable events in the UK and the USA. The findings show that domestic laws of these countries cover the matter sufficiently. However, the question of whether the regulation should fall under international regulation can unfortunately not be answered with confidence as it would require a test-case of a situation where an oil spill affects multiple littoral states. 展开更多
关键词 International law OFFSHORE oil gas liability Macondo.
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Compulsory Liability Insurance for Marine Drilling Platforms Pollution under Chinese Law
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作者 XU Tie ZHANG Pengfei 《Journal of Shipping and Ocean Engineering》 2016年第6期356-363,共8页
Compulsory liability insurance has widely existed in the field of marine insurance. However, marine drilling platforms have always been excluded from this system in China. In view of the special legal nature of oil po... Compulsory liability insurance has widely existed in the field of marine insurance. However, marine drilling platforms have always been excluded from this system in China. In view of the special legal nature of oil pollution compulsory liability insurance for marine drilling platforms, this paper analyzes a number of issues related to oil pollution compulsory liability insurance, elaborates on the necessity for China to implement the system and makes some suggestions about the implementation of that. 展开更多
关键词 Marine drilling platforms oil pollution compulsory liability insurance.
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Public Broadcasting in Brazil" Challenges to Overcome a Symbolic Liability
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作者 Carlos Eduardo Esc h, Nel1ia R. Del Bianco 《Journalism and Mass Communication》 2013年第11期691-704,共14页
A survey of opinion conducted by the Observatory of Public Broadcasting in Latin America indicates that one of the biggest challenges for Brazilian public broadcasting lies in changing the perception that has been cry... A survey of opinion conducted by the Observatory of Public Broadcasting in Latin America indicates that one of the biggest challenges for Brazilian public broadcasting lies in changing the perception that has been crystallized by the public in relation to such stations. Initial analysis of the data obtained so far shows that the respondents have a negative image in relation to public media. At times, the people manifest themselves in favor of the principles that should delimit the performance of radios and TVs, such as diversity, independence, and differentiation from commercial media, but, which are not fully followed. At other times, they criticize the quality of programming and the political-governmental character of these stations. In this critical scenario, the paper presents a discussion on the challenges facing the sector considering the complex historical, cultural, and economic policy circumstances, that have contributed to the maintenance of this "symbolic liability" between media and the audience/citizens, and which reflects on the possible strategies to face the problem. 展开更多
关键词 public broadcasting observatory of public broadcasting audience and symbolic liability
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The Fundamental Need of Reform in Company Law in England: Parent Company’s Liability for Debt of Insolvent Subsidiary
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作者 Yining Long 《Journal of Finance Research》 2020年第2期151-155,共5页
Based on the fact that the parent company has actual control over the subsidiary company,this paper analyzes the possibility of the parent company using the subsidiary company to seek benefits and damage the interests... Based on the fact that the parent company has actual control over the subsidiary company,this paper analyzes the possibility of the parent company using the subsidiary company to seek benefits and damage the interests of creditors.Moreover,under the intangible protection of the current limited liability system and the independent personality of the company,it can“retreat”.This is undoubtedly against the original intention of the establishment of enterprise groups and has great potential harm to creditors.In addition,on the basis of the relief measures for the rights and interests of the parent company caused by the bad behavior of the subsidiary,the legal defects that should be carefully considered are determined.Considering whether there are other remedies that may have the same effect as disclosure,some are more moderate than disclosure.With Britain’s strong caution about lifting the veil,a more moderate direction could be considered. 展开更多
关键词 REFORM Limited liability Parent company Subsidray
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"Principal Components" for the Calculation of the Best Estimate Liability of Future Discretionary Benefits under Solvency II
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作者 Luca Bianchi 《Journal of Mathematics and System Science》 2013年第6期271-278,共8页
The core of the presentation that I propose treats about the application of principal component analysis for the estimation of the future earnings of the Segregated Funds. The Segregated Funds are the pools of assets ... The core of the presentation that I propose treats about the application of principal component analysis for the estimation of the future earnings of the Segregated Funds. The Segregated Funds are the pools of assets which have been using in the Italian Insurance Market since mid 80's for managing the "with profit" business, also known as business with "discretionary participation feature" according to IFRS4 since the income attributable to the policyholders is composed by the net realised gains less a fee and by a minimum guarantee, if any. The discretion of the Management of the Entity lays on the decision on whether and when to realise both the financial gains and the financial losses of the underlying investments. This strategy is tied by the need to manage an appropriate ALM, from the rules included in the local legislation as well as by the policy about the solvency margin (for example a minimum solvency ratio to fulfil that is conditional upon the value of income attributed that year). The fee can not be changed, i.e., is not discretionary, the minimum granted could be fixed on annual basis-sometimes paid on cash recurrently-or could be promised only at expiration or sometimes promised at expiration or in advance only for death and disability. In case of years so adverse that the Entity is not able to avoid earnings too low, sometimes the entity delivers an additional bonus, in order to compensate their policyholders, which is based above a full discretion. Principal components are used in finance as well as in other fields such as genetic. You can see some of these applications in two of the references advised below. The purposes of the technique of principal components are (1) to increase objectivity of results and their verifiability by third parties such as auditors, (2) make speeder the time spent for the analytical calculations (i.e., runs of the actuarial models) and (3) to render the relationship between the asset composition and the their earnings effectively used for the best estimate liabilities through their contribution in forecasting future cash flows. 展开更多
关键词 liabilities in solvency II future discretionary benefits principal components.
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Study on the Tort Liability of Electronic Commerce Platform
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作者 WU Zhixiao HAO Huifeng 《Chinese Business Review》 2021年第6期207-211,共5页
Today,the rapid development of electronic commerce(E-commerce)has added a new driving force for China’s economic development.However,all kinds of legal problems have followed,such as uncontrolled production and sale ... Today,the rapid development of electronic commerce(E-commerce)has added a new driving force for China’s economic development.However,all kinds of legal problems have followed,such as uncontrolled production and sale of fake goods,frequent malicious complaints,endless unfair competition,and illegal infringement,which have harmed the legitimate interests of consumers and seriously damaged the market order and fair competition.In order to provide some theoretical and realistic reference for the development of China’s E-commerce industry,this paper focuses on the relevant problems in the field of“infringement”of E-commerce platforms for in-depth thinking,and puts forward suggestions for solving the existing problems based on the development status of E-commerce platforms. 展开更多
关键词 E-commerce platform operator of E-commerce platform tort liability
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Co-20Re-25Cr-7Al合金在3.0×10^(-5)Pa低氧压下的氧化行为研究
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作者 张帅 孙海英 +5 位作者 徐勋虎 向军淮 张恒 王玲 胡剑松 严凯 《材料保护》 CAS CSCD 2023年第8期103-108,共6页
为探究在低氧压高温环境中添加少量的Al是否对Co-Re基高温合金形成保护性的Cr_(2)O_(3)氧化膜具有协同效应,研究了Co-20Re-25Cr-7Al合金在1100~1300℃,3.0×10^(-5)PaO_(2)下氧化24 h的恒温氧化行为。结果显示:合金的氧化动力学曲... 为探究在低氧压高温环境中添加少量的Al是否对Co-Re基高温合金形成保护性的Cr_(2)O_(3)氧化膜具有协同效应,研究了Co-20Re-25Cr-7Al合金在1100~1300℃,3.0×10^(-5)PaO_(2)下氧化24 h的恒温氧化行为。结果显示:合金的氧化动力学曲线完全符合抛物线规律,其氧化激活能为242.3 kJ/mol。合金在1100~1300℃形成的氧化膜很类似,主要由连续致密的Cr_(2)O_(3)层组成,其上分布着少量的CoO和CoCr_(2)O_(4)尖晶石。与相应的Co-20Re-25Cr三元合金相比,Co-20Re-25Cr-7Al四元合金形成的具有保护性的Cr_(2)O_(3)层在氧化过程中可以防止合金中的Re元素以ReO_(3)的形式挥发,从而为合金提供更好的保护。7%Al的添加不足以使Co-20Re-25Cr-7Al合金发生Al的选择性外氧化,因此在外氧化膜下面形成了Al的内氧化区。但Al的添加明显促进了连续而致密的Cr_(2)O_(3)层的形成,大大提高了合金的抗高温氧化性能。Al的添加和低氧压对于形成保护性的Cr_(2)O_(3)层具有协同效应。 展开更多
关键词 Co-20re-25Cr-7Al合金 高温氧化 低氧压 Al效应
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