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EFFECT OF Mn CONTENT ON KINETIC PARAMETER DURING PHASE TRANSFORMATION IN CuZnAlMnNi SHAPE MEMORY ALLOYS 被引量:2
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作者 Geng, GL Bai, YJ 《中国有色金属学会会刊:英文版》 CSCD 1996年第3期150-152,共3页
EFFECTOFMnCONTENTONKINETICPARAMETERDURINGPHASETRANSFORMATIONINCuZnAlMnNiSHAPEMEMORYALLOYS¥GengGuili(Institut... EFFECTOFMnCONTENTONKINETICPARAMETERDURINGPHASETRANSFORMATIONINCuZnAlMnNiSHAPEMEMORYALLOYS¥GengGuili(InstituteforMaterialsEngi... 展开更多
关键词 Mn content CuZnAlMnNi SHAPE MEMORY alloy phase TRANSFORMATION KINETIC PARAMETER
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Effect of Cr content and cooling rate on the primary phase of Al-2.5Mn alloy 被引量:1
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作者 Hang-qi Feng Zhi-bo Yang +2 位作者 Ye-tong Bai Li Zhang Yu-lin Liu 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2019年第12期1551-1558,共8页
The effect of Cr content and cooling rate on the microstructure of Al-Mn alloy was studied using well resistance furnace melting,and the alloy was analyzed using scanning electron microscopy(SEM)and X-ray diffraction(... The effect of Cr content and cooling rate on the microstructure of Al-Mn alloy was studied using well resistance furnace melting,and the alloy was analyzed using scanning electron microscopy(SEM)and X-ray diffraction(XRD).The experimental results showed that adding Cr could significantly improve the morphology of the primary phase in the Al-2.5Mn alloy.Without Cr,the primary phase in the alloy was thick,needle-like,and strip-like structure.After adding 0.2wt%-0.5wt%Cr,the primary phase in the upper part of the alloy was gradually fined and reached the best effect at 0.35wt%Cr.When the content of Cr was 0.5wt%,the microstructure of the primary phase in the upper part began to coarsen.The bottom of the alloy was a large bulk phase,but still much finer than that without adding Cr.XRD and SEM analysis showed that the precipitation phase at the bottom was mainly Al85Mn7Cr8,while the fine microstructure at the top was Al6Mn and Al3Mn.The results of the cooling rate experiments showed that the primary phase of Al-2.5Mn-0.35Cr was further refined,and the eutectic microstructure was partly achieved,under air-cooling condition.And when the cooling method was iron die-cooling,the microstructure of the Al-2.5Mn-0.35Cr alloy was changed into a eutectic microstructure. 展开更多
关键词 Al-2.5Mn ALLOY Cr content PRIMARY phase COOLING rate
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Effects of magnesium content on phase constituents of Al-Mg-Si-Cu alloys 被引量:11
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作者 刘宏 赵刚 +1 位作者 刘春明 左良 《中国有色金属学会会刊:英文版》 EI CSCD 2006年第2期376-381,共6页
By means of scanning electron microscopy(SEM), energy dispersive spectrum(EDS), X-ray diffractometry(XRD) and metallographic analysis, the effects of variation of magnesium content on phase constituents of Al-Mg-Si-Cu... By means of scanning electron microscopy(SEM), energy dispersive spectrum(EDS), X-ray diffractometry(XRD) and metallographic analysis, the effects of variation of magnesium content on phase constituents of Al-Mg-Si-Cu alloys were investigated. The results indicate that the constituents formed during casting alloys are main Al1.9CuMg4.1Si3.3,Al4(MnFe)3Si2 and Mg2Si, while pure Si is only present in the alloy containing lower magnesium content. Increasing Mg content leads to increasing the amount of Mg2Si, but decreasing the amount of Al1.9CuMg4.1Si3.3 and Al4(MnFe)3Si2. During the following homogenization process, Al1.9CuMg4.1Si3.3 is completely dissolved, Al4(MnFe)3Si2 and pure Si remain unchanged. After rolling and final heat treatment, the constituents in the alloys change no longer. 展开更多
关键词 Al1.9CuMg4.1Si3.3 Al4(MnFe)3Si2 MG2SI 铝合金
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Effect of Y_2BaCuO_5 Phase Content on Magnetic Property in Bulk Melt-textured YBCO
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作者 付雪奎 肖玲 任洪涛 《Journal of Rare Earths》 SCIE EI CAS CSCD 1995年第2期137-139,共3页
Bulk YBCO samples were prepared by PMP method. The nominal composition was Y123+xwt% Y211+10 wt% Ag2O (x= 0,15,25,40).The result of magnetic measurements indicated the sample with x= 1 5 at 77 K exhibited a J0 of 3. 9... Bulk YBCO samples were prepared by PMP method. The nominal composition was Y123+xwt% Y211+10 wt% Ag2O (x= 0,15,25,40).The result of magnetic measurements indicated the sample with x= 1 5 at 77 K exhibited a J0 of 3. 9 ×104 A/cm2 at 0.1 T and 2. 4 ×104A/cm2 at 1.0 T.The morphology of samples suggested that fine dispersed Y2BaCuO5 phase acts as effective pinning centers. 展开更多
关键词 Oxide superconductor Y_2BaCuO_5 phase content Magnetic property YTTRIUM
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Equilibrium Diagram in the Presence of a Gaseous Phase and Its Application(Overview PartⅡ)
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作者 Du Ailing Zhang Heming 《Rare Metals》 SCIE EI CAS CSCD 1998年第2期43-49,共7页
E-T or log p-1/T diagrams showing the influence of temperature and pressure in a gaseous phase were presented in par tⅠof the overview.I n partⅡ,the relationship between E-T and Kellogg diagrams or between E-T and E... E-T or log p-1/T diagrams showing the influence of temperature and pressure in a gaseous phase were presented in par tⅠof the overview.I n partⅡ,the relationship between E-T and Kellogg diagrams or between E-T and E-pH diagrams is discussed.E-T diagrams cover larger field of application than the other two.The practical use of E-T or log p-1/T diagrams is also investigated,which includes:the calculation of polycomponent equilibria in a gaseous phase,the prediction of cor rosion products,the interpretation of catalytic mechanism,the exploration for the possibility of producing aluminum with carbothermic method,etc.The limitation of this kind of diagrams is also discussed. 展开更多
关键词 THERMODYNAMICS gaseous phase Equilibrium diagram APPLICATION
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Introduction to investigations of the negative corona and EHD flow in gaseous two-phase fluids
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作者 Jerzy MIZERACZYK Artur BERENDT 《Plasma Science and Technology》 SCIE EI CAS CSCD 2018年第5期147-156,共10页
Research interests have recently been directed towards electrical discharges in multi-phase environments.Natural electrical discharges,such as lightning and coronas,occur in the Earth's atmosphere,which is actually a... Research interests have recently been directed towards electrical discharges in multi-phase environments.Natural electrical discharges,such as lightning and coronas,occur in the Earth's atmosphere,which is actually a mixture of gaseous phase(air) and suspended solid and liquid particulate matters(PMs).An example of an anthropogenic gaseous multi-phase environment is the flow of flue gas through electrostatic precipitators(ESPs),which are generally regarded as a mixture of a post-combustion gas with solid PM and microdroplets suspended in it.Electrical discharges in multi-phase environments,the knowledge of which is scarce,are becoming an attractive research subject,offering a wide variety of possible discharges and multi-phase environments to be studied.This paper is an introduction to electrical discharges in multi-phase environments.It is focused on DC negative coronas and accompanying electrohydrodynamic(EHD) flows in a gaseous two-phase fluid formed by air(a gaseous phase) and solid PM(a solid phase),run under laboratory conditions.The introduction is based on a review of the relevant literature.Two cases will be considered:the first case is of a gaseous two-phase fluid,initially motionless in a closed chamber before being subjected to a negative corona(with the needle-toplate electrode arrangement),which afterwards induces an EHD flow in the chamber,and the second,of a gaseous two-phase fluid flowing transversely with respect to the needle-to-plate electrode axis along a chamber with a corona discharge running between the electrodes.This review-based introductory paper should be of interest to theoretical researchers and modellers in the field of negative corona discharges in single-or two-phase fluids,and for engineers who work on designing EHD devices(such as ESPs,EHD pumps,and smoke detectors). 展开更多
关键词 DC negative corona discharge Trichel pulses gaseous two-phase flow air withsuspended particle flow ESP EHD
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Al含量提高对IN 617合金持久性能及组织稳定性的影响
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作者 任利国 白亚冠 +5 位作者 聂义宏 杨晓禹 王大鹏 白兴红 彭亚敏 傅万堂 《材料热处理学报》 CAS CSCD 北大核心 2024年第9期150-159,共10页
采用高温持久实验、扫描电镜(SEM)及透射电镜(TEM)等研究了Al含量提高对IN 617合金持久性能及组织稳定性的影响。结果表明:Al含量提高后,基于超过4万小时的实验数据,IN 617合金700℃、10万小时的外推持久强度超过170 MPa,持久性能显著提... 采用高温持久实验、扫描电镜(SEM)及透射电镜(TEM)等研究了Al含量提高对IN 617合金持久性能及组织稳定性的影响。结果表明:Al含量提高后,基于超过4万小时的实验数据,IN 617合金700℃、10万小时的外推持久强度超过170 MPa,持久性能显著提高,合金的持久断裂机制仍以微孔聚集长大为主;Al含量的提高会明显促进IN 617合金中γ′相的析出,提高其含量,同时也会促进合金中μ相和σ相等TCP相(Topologically close-packed phases)的析出,从而提高合金的硬度与持久性能,但尚未发现TCP相会对合金持久强度产生不利影响;时效处理时间越长,晶界析出相尺寸越大且愈加连续,致使晶界结合强度降低,而Al含量的提高又会提高晶内强度。二者共同作用,会使IN 617合金的持久塑性降低。 展开更多
关键词 IN 617合金 AL含量 持久性能 组织稳定性 析出相
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Co替代Ni对汽车电池用La_(0.8)Mg_(0.2)Ni_(3.8-x)Co_(x)储氢合金电化学性能的影响
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作者 彭卫锋 施卫 《无机盐工业》 CAS CSCD 北大核心 2024年第11期65-71,共7页
采用磁悬浮熔炼炉制备了铸态La_(0.8)Mg_(0.2)Ni_(3.8-x)Co_(x)储氢合金,研究了Co含量对La_(0.8)Mg_(0.2)Ni_(3.8-x)Co_(x)储氢合金相结构和电化学性能的影响。结果表明,不同Co含量的La_(0.8)Mg_(0.2)Ni_(3.8-x)Co_(x)储氢合金主要由LaN... 采用磁悬浮熔炼炉制备了铸态La_(0.8)Mg_(0.2)Ni_(3.8-x)Co_(x)储氢合金,研究了Co含量对La_(0.8)Mg_(0.2)Ni_(3.8-x)Co_(x)储氢合金相结构和电化学性能的影响。结果表明,不同Co含量的La_(0.8)Mg_(0.2)Ni_(3.8-x)Co_(x)储氢合金主要由LaNi_(5)相、Ce_(5)Co_(19)相、Pr_(5)Co_(19)相和CeNi_(2)相组成,La_(0.8)Mg_(0.2)Ni_(3.8-x)Co_(x)储氢合金中x值增大(Co含量增加)会促使Ce_(5)Co_(19)相向Pr_(5)Co_(19)相转变,且当x=1.05时储氢合金中LaNi_(5)相含量最小。随着x值增大,储氢合金的放氢平台先减小后增大、最大储氢量先增大后减小、第100次充放电后的容量保持率(S_(100))先增大后减小,当x=0.15时储氢合金的最大放电容量和S_(100)取得最大值,分别为352.39 mA·h/g和81.29%。随着La_(0.8)Mg_(0.2)Ni_(3.8-x)Co_(x)储氢合金中x值从0.65增加至2.25,储氢合金电极的交流阻抗逐渐增大,交换电流密度逐渐减小,氢扩散系数先增大后减小并在x=1.05时取得最大值,电流密度为300、600、900 mA/g时的高倍率放电性能均逐渐减小。结果表明,交换电流密度是决定La_(0.8)Mg_(0.2)Ni_(3.8-x)Co_(x)储氢合金电极高倍率放电性能的关键因素。 展开更多
关键词 Co含量 La_(0.8)Mg_(0.2)Ni_(3.8-x)Co_(x)储氢合金 相结构 微观形貌 电化学性能
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社区词研究三十年
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作者 田小琳 田静 《语言战略研究》 CSSCI 北大核心 2024年第3期86-96,共11页
“社区词”概念提出至今已有整30年。从这30年的社区词研究历程中,可以梳理出两条并行而又有交叉的研究主线:一条是概念线,分为概念形成期和概念完善期,以《香港社区词词典》的出版为分节点;另一条是理论线,分为理论建构期与理论发展期... “社区词”概念提出至今已有整30年。从这30年的社区词研究历程中,可以梳理出两条并行而又有交叉的研究主线:一条是概念线,分为概念形成期和概念完善期,以《香港社区词词典》的出版为分节点;另一条是理论线,分为理论建构期与理论发展期,以“社区词”作为标准术语收入《语言学名词》为分节点。30年来的研究内容可以分为3类:围绕社区词概念的“名”“实”辨析、社区词的搜集整理与个案调查、基于词典的社区词研究;研究特征则可以归纳为适用领域的广泛性、研究视角的互补性、研究过程的科学性与研究任务的连贯性。在此基础上,也发现现有研究存在一些问题:语料不平衡造成描写分析不够系统深入,学术探讨多而应用成果少,理论的国际化程度有待提高。因此,未来研究中,田野调查仍是首要任务,还需要进一步阐明社区词与相关术语的异同,重视社区词研究的应用价值,并致力于提升社区词理论的国际化程度。 展开更多
关键词 社区词 发展分期 研究内容 研究特征
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基于幅度和相位融合的微波两相流测量系统设计
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作者 李利品 代雷 +2 位作者 黄燕群 卢宇 颜曌恩 《仪表技术与传感器》 CSCD 北大核心 2024年第5期79-84,共6页
针对油井开采过程中需要对各相含量进行精确预测以调整开采策略的实际问题,设计了一种基于微波法的油水两相流检测系统。该系统利用微波在不同介质中透射能力的差异,构建了一套包含微波信号源、功率放大器、功率分配器、检波器和STM32F1... 针对油井开采过程中需要对各相含量进行精确预测以调整开采策略的实际问题,设计了一种基于微波法的油水两相流检测系统。该系统利用微波在不同介质中透射能力的差异,构建了一套包含微波信号源、功率放大器、功率分配器、检波器和STM32F103ZET6核心板的硬件电路系统,通过编写AD采集和串口通信的软件代码,来接收检波器端幅度和相位数据。在数据处理方面,分别对幅度数据、相位数据和幅度-相位融合数据采用BP神经网络的方法预测含水率。实验表明:在使用融合数据时,预测准确度可以提高至96.33%,取得了较理想的效果。 展开更多
关键词 幅度和相位融合 微波法 两相流 含水率 BP神经网络 AD采集
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Fe、Ni元素微合金化对Al-11Si铝合金微观组织及力学性能的影响
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作者 刘清 王若超 +2 位作者 晁延吉 齐志峰 刘洪涛 《轻金属》 2024年第4期44-49,共6页
本研究利用扫描电子显微镜(SEM)、能量散射X射线光谱(EDS)和拉伸试验机,研究了Ni(1.2及1.6wt.%)和Fe(0.6及0.8wt.%)含量对Al-11Si铝合金的微观组织及不同温度下的力学性能的影响。实验结果表明,适量的Ni元素对于Al-11Si合金中富含Fe相... 本研究利用扫描电子显微镜(SEM)、能量散射X射线光谱(EDS)和拉伸试验机,研究了Ni(1.2及1.6wt.%)和Fe(0.6及0.8wt.%)含量对Al-11Si铝合金的微观组织及不同温度下的力学性能的影响。实验结果表明,适量的Ni元素对于Al-11Si合金中富含Fe相的类型、形态和分布具有积极作用。在Al-11Si铝合金中添加1.2wt.%Ni和0.6wt.%Fe可以生成一种类似“汉字状”的富Fe强化相。当进一步增加到1.6wt.%Ni和0.8wt.%Fe后,富Fe相变为了长针状,对Al基体产生严重的割裂作用,降低了合金力学性能。由于含有1.2wt.%Ni和0.6wt.%Fe的Al-11Si铝合金中生成了“汉字状”富Fe强化相,合金的高温拉伸性能得到了显著改善。在350℃的测试温度下,Al-11Si铝合金的抗拉强度(UTS)达到了139 MPa。 展开更多
关键词 Al-11Si铝合金 Ni含量 Fe含量 富Fe相 力学性能
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叶轮开孔参数对气液两相高速离心泵的影响
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作者 王彦伟 许继洋 李育房 《化学工程》 CAS CSCD 北大核心 2024年第8期71-77,共7页
为保持高速离心泵在气液两相条件下的性能稳定性,采用CFD数值模拟方法探究不同孔径和位置叶轮开孔对高速离心泵的性能影响。结果表明:开孔泵的性能趋于稳定,随着入口含气率的增大,开孔泵的扬程逐渐降低。而原始无孔泵扬程随着入口含气... 为保持高速离心泵在气液两相条件下的性能稳定性,采用CFD数值模拟方法探究不同孔径和位置叶轮开孔对高速离心泵的性能影响。结果表明:开孔泵的性能趋于稳定,随着入口含气率的增大,开孔泵的扬程逐渐降低。而原始无孔泵扬程随着入口含气率的增大而显著下降。因此,在入口含气率较大的情况下,开孔可以提高高速离心泵的性能;当入口含气率不足时,有孔泵的性能不如原始无孔泵,扬程随着孔径的增大而减小。当孔径为3.5 mm时,扬程衰减超过18%,因此孔径不应>3 mm;随着开孔孔径的增大,叶轮中的气体体积减小,而孔径越大,泵内的水力损失越大。因此在选择孔径时,必须在叶轮中的气体体积和泵的水力损失之间进行权衡;开孔的径向位置值越小,孔越靠近叶轮中心,水力损失越大;开孔的径向位置值越大,叶轮中气体体积就越大,在选择开孔的径向位置时,仍然需要权衡。对于所研究的高速离心泵,仿真结果表明,径向位置为14 mm和孔径为2 mm的选择是可取的,可以很好地平衡叶轮中气体体积和水力损失。 展开更多
关键词 离心泵 开孔叶轮 数值模拟 气液两相 含气率
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Phase-Transitions at High, Very High, and Very Low Temperatures upon Nano-Indentations: Onset Forces and Transition Energies
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作者 Gerd Kaupp 《Advances in Materials Physics and Chemistry》 2023年第6期101-120,共20页
This paper describes the phase-transition energies from published loading curves on the basis of the physically deduced F<sub>N</sub> = k-h<sup>3/2</sup> law that does not violate the energy la... This paper describes the phase-transition energies from published loading curves on the basis of the physically deduced F<sub>N</sub> = k-h<sup>3/2</sup> law that does not violate the energy law by assuming h<sup>2</sup> instead, as still do ISO-ASTM 14,577 standards. This law is valid for all materials and all “one-point indentation” temperatures. It detects initial surface effects and phase-transition kink-unsteadiness. Why is that important? The mechanically induced phase-transitions form polymorph interfaces with increased risk of crash nucleation for example at the pickle forks of airliners. After our published crashing risk, as nucleated within microscopic polymorph-interfaces via pre-cracks, had finally appeared (we presented microscopic images (5000×) from a model system), 550 airliners were all at once grounded for 18 months due to such microscopic pre-cracks at their pickle forks (connection device for wing to body). These pre-cracks at phase-transition interfaces were previously not complained at the (semi)yearlycheckups of all airliners. But materials with higher compliance against phase- transitions must be developed for everybody’s safety, most easily by checking with nanoindentations, using their physically correct analyses. Unfortunately, non-physical analyses, as based on the after all incredible exponent 2 on h for the F<sub>N</sub> versus h loading curve are still enforced by ISO-ASTM standards that cannot detect phase-transitions. These standards propagate that all of the force, as applied to the penetrating cone or pyramid shall be used for the depth formation, but not also in part for the pressure to the indenter environment. However, the remaining part of pressure (that was not consumed for migrations, etc.) is always used for the elastic modulus detection routine. That severely violates the energy-law! Furthermore, the now physically analyzed published loading curves contain the phase-transition onsets and energies information, because these old-fashioned authors innocently (?) published (of course correct) experimental loading curves. These follow as ever the physically deduced F<sub>N</sub> = k-h<sup>3/2</sup> relation that does not violate the energy law. Nevertheless, the old-fashioned authors stubbornly assume h<sup>2</sup>instead of h<sup>3/2</sup> as still do ISO-ASTM 14,577 standards according to an Oliver-Pharr publication of 1992 and textbooks. The present work contributes to understanding the temperature dependence of phase-transitions under mechanical load, not only for aviation and space flights, which is important. The physical calculations use exclusively regressions and pure algebra (no iterations, no fittings, and no simulations) in a series of straightforward steps by correcting for unavoidable initial effects from the axis cuts of the linear branches from the above equation exhibiting sharp kink unsteadiness at the onset of phase transitions. The test loading curves are from Molybdenum and Al 7075 alloy. The valid published loading curves strictly follow the F<sub>N</sub> = k-h<sup>3/2</sup> relation. Full applied work, conversion work, and conversion work per depth unit show reliable overall comparable order of magnitude values at temperature increase by 150°C (Al 7075) and 980°C (Mo) when also considering different physical hardnesses and penetration depths. It turns out how much the normalized endothermic phase-transition energy decreases upon temperature increase. For the only known 1000°C indentation we provide reason that the presented loading curves changes are only to a minor degree caused by the thermal expansion. The results with Al 7075 up to 170°C are successfully compared. Al 7075 alloy is also checked by indentation with liquid nitrogen cooling (77 K). It gives two endothermic and one very prominent exothermic phase transition with particularly high normalized phase-transition energy. This indentation loading curve at liquid nitrogen temperature reveals epochal novelties. The energy requiring endothermic phase transitions (already seen at 20°C and above) at 77 K is shortly after the start of the second polymorph (sharply at 19.53 N loading force) followed by a strongly exothermic phase-transition by producing (that is losing) energy-content. Both processes at 77 K are totally unexpected. The produced energy per depth unit is much higher energy than the one required for the previous endothermic conversions. This exothermic phase-transition profits from the inability to provide further energy for the formation of the third polymorph as endothermic obtained at 70°C and above. That is only possible because the very cold crystal can no longer support endothermic events but supports exothermic ones. Both endothermic and exothermic phase-transitions at 77 K under load are unprecedented and were not expected before. While the energetic support at 77 K for endothermic processes under mechanical load is unusual but still understandable (there are also further means to produce lower temperatures). But strongly exothermicphase-transition under mechanical load for the production of new modification with negative energy content (less than the energy content of the ambient polymorph) at very low temperature is an epochal event here on earth. It leads to new global thinking and promises important new applications. The energy content of strongly exothermic transformed material is less than the thermodynamic standard zero energy-content on earth. And it can only be reached when there is no possibility left to produce an endothermic phase-transition. Such less than zero-energy-content materials should be isolated, using appropriate equipment. Their properties must be investigated by chemists, crystallographers, and physicists for cosmological reasons. It could be that such materials will require cooling despite their low energy content (higher stability!) and not survive at ambient temperatures and pressures on earth, but only because we do not know of such negative-energy-content materials with our arbitrary thermodynamic standard zeros on earth. At first one will have to study how far we can go up with temperature for keeping them stable. Thus, the apparently never before considered unprecedented result opens up new thinking for the search of new polymorphs that can, of course, not be reached by heating. Various further applications including cosmology and space flight explorations are profiting from it. 展开更多
关键词 Aluminum Alloy Aviation Cosmology Epochal News High and Liquid Nitrogen Temperature Indentations Negative-Energy-content Polymorph Molybdenum phase-Transition-Energy
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高压作用下水泥基粉末材料的接触硬化研究综述
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作者 张超 张子龙 +4 位作者 黄伟 潘阿馨 赖志超 吴天赐 黄醒东 《材料导报》 EI CAS CSCD 北大核心 2024年第16期117-125,共9页
在高压作用下,一些具有无定型相的水泥基粉末材料会发生接触硬化现象,粉末颗粒在压力作用下发生缩聚运动,并在粉末颗粒间形成结构键,进而快速形成具有一定强度及耐水性的人造石材。本文综述了压力作用下水泥基粉末材料接触硬化的成键机... 在高压作用下,一些具有无定型相的水泥基粉末材料会发生接触硬化现象,粉末颗粒在压力作用下发生缩聚运动,并在粉末颗粒间形成结构键,进而快速形成具有一定强度及耐水性的人造石材。本文综述了压力作用下水泥基粉末材料接触硬化的成键机理以及粉末水分含量、干燥条件、钙硅比、压制过程对其接触硬化性能影响的研究进展。相关研究结果表明,压力作用下粉末颗粒间会形成氢键、范德华力、固体桥键等结构键;粉末水分含量是影响接触硬化性能的重要因素,在压力作用下,水分可以改变粉末颗粒的表面性质并影响颗粒之间的结合,进而改变压制成品的力学性能;钙硅比对接触硬化性能的影响显著,不同粉末材料在压制时的最佳钙硅比亦是不同;摩擦力的存在降低了压制效率,造成压制成品密度、强度分布不均匀,润滑剂的加入可以有效降低摩擦力的影响;此外,降低压制模具高径比并使用双面压制可有效提升压制成品的质量。 展开更多
关键词 水泥基粉末材料 接触硬化 无定型相 结构键 水分含量 钙硅比 压制工艺
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陆相页岩层系岩心中气态烃井场测定技术初步应用及展望 被引量:1
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作者 贾梦瑶 鲍云杰 +6 位作者 李志明 申宝剑 曹婷婷 刘鹏 杨振恒 卢龙飞 黎茂稳 《石油实验地质》 CAS CSCD 北大核心 2024年第1期183-190,共8页
陆相页岩层系的流体分析是页岩油甜点评价的重要基础,针对岩心样品中气态烃易于散失的特性和页岩油钻井现场的需求,研发了井场岩心气态烃快速采集测定装置及方法,探讨了基于岩心气态烃分析和热解含油性分析资料快速计算视气油比和估算... 陆相页岩层系的流体分析是页岩油甜点评价的重要基础,针对岩心样品中气态烃易于散失的特性和页岩油钻井现场的需求,研发了井场岩心气态烃快速采集测定装置及方法,探讨了基于岩心气态烃分析和热解含油性分析资料快速计算视气油比和估算游离油损失的方法。研究表明,该装置适用于全直径岩心和块状样品的气态烃检测,既可以实现全直径岩心在常温、常压下逸散气态烃的采集测定,也可以测定块状岩心样品的气态烃总量,气态烃检测相对误差10%,测试结果可以转换为单位质量岩样气态烃含量。全直径岩心逸散气分析可实现岩心气态烃的非破坏式采集和测定,反映了页岩层系垂向上含油气性及其非均质性的变化特征。视气油比可反映页岩层系含油气性和可流动性的趋势,视气油比越大,代表相应页岩层系页岩油可流动性越好。利用视气油比可估算岩心经历降压降温脱气过程中游离烃的损失量,在建立岩心降温降压脱气过程的热解游离烃损失恢复方法中具有较大应用潜力。岩心气态烃井场测定技术丰富了适用于井场的岩心流体分析实验技术手段和方法,为陆相页岩层系流体评价及甜点确定提供数据支撑。 展开更多
关键词 气态烃含量 视气油比 游离油损失恢复 可流动性评价 页岩油气 陆相页岩
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Cu含量对Al-Cu-Li合金淬火敏感性的影响 被引量:1
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作者 刘锦勋 李红英 +2 位作者 杨惠钧 林海涛 郑子樵 《中国有色金属学报》 EI CAS CSCD 北大核心 2024年第5期1506-1518,共13页
采用薄板叠层末端淬火的方法,通过强度测试、连续冷却转变(CCT)和时间-温度-转化率(TTT)曲线计算及X射线衍射、扫描电镜、透射电镜等微观组织表征方法,研究了Cu含量(3.15%、3.63%和3.88%)对Al-Cu-Li合金淬火敏感性的影响,结合理论分析,... 采用薄板叠层末端淬火的方法,通过强度测试、连续冷却转变(CCT)和时间-温度-转化率(TTT)曲线计算及X射线衍射、扫描电镜、透射电镜等微观组织表征方法,研究了Cu含量(3.15%、3.63%和3.88%)对Al-Cu-Li合金淬火敏感性的影响,结合理论分析,从析出驱动力和形核位点的角度分析了Cu含量影响淬火敏感性的机理。结果表明:随着Cu含量的增加,晶格畸变能增加,Li的溶解度降低,淬火态合金中位错和残留第二相增多,含Li相的析出驱动力和非均匀形核位点增加,淬火沉淀相增多;随着临界冷却速率的增大,鼻尖温度孕育期缩短,强度残存率减小,Al-Cu-Li合金淬火敏感性提高。T8态合金强度受Cu含量和淬火速率共同作用,淬火速率较高时,主要受Cu含量的影响;淬火速率较低时,Cu含量的影响减小。 展开更多
关键词 AL-CU-LI合金 CU含量 淬火敏感性 强度 淬火沉淀相
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Effects of Cr content on microstructure and mechanical properties of single crystal superalloy 被引量:3
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作者 史振学 刘世忠 +1 位作者 王效光 李嘉荣 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2015年第3期776-782,共7页
Two experimental single crystal superalloys with 2% Cr and 4% Cr (mass fraction) were cast in a directionally solidified furnace, while other alloying element contents were kept unchanged. The effects of Cr content on... Two experimental single crystal superalloys with 2% Cr and 4% Cr (mass fraction) were cast in a directionally solidified furnace, while other alloying element contents were kept unchanged. The effects of Cr content on the microstructure, phase stability, tensile properties at 1100 °C and stress rupture properties at 1070 °C and 160 MPa of the single crystal superalloy were investigated. The results show that the size ofγ′ phase particles become small and uniform, and the cubic shape turns a little regular with the increase of Cr content. Theγ′ directional coarsening and rafting were observed in the 2% Cr and 4% Cr alloys after long term aging (LTA) at 1100 °C. The rafting rate ofγ′ phase increased with increasing Cr content. Needle-shaped topologically close packed (TCP) phases precipitated and grew along fixed direction in both alloys. The precipitating rate and volume fraction of TCP phases significantly increased with the increase of Cr content. The tensile property of the alloy increased and the stress rupture properties of the alloy decreased with the increase of Cr content at high temperature. The increase of Cr content increased the partition ratio of TCP forming elements, Re, W, and Mo, and the saturation degrees of these elements inγ phases increased. Therefore, the high temperature phase stability of the alloy decreased with the increase of Cr content. 展开更多
关键词 single crystal superalloy Cr content MICROSTRUCTURE phase stability mechanical properties
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甲烷-水合物两相平衡体系气相水含量研究
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作者 徐振 戴泽利 +3 位作者 王逸伟 孙强 陈建义 郭绪强 《低碳化学与化工》 CAS 北大核心 2024年第1期113-118,共6页
天然气中的微量气态水在天然气开采、集输过程中可能与气体小分子形成水合物,造成管路堵塞,因此需要对天然气进行脱水处理。为了合理设计天然气最大容许水含量参数,准确测量和计算天然气-水合物相平衡时的气相水含量具有重要意义。在压... 天然气中的微量气态水在天然气开采、集输过程中可能与气体小分子形成水合物,造成管路堵塞,因此需要对天然气进行脱水处理。为了合理设计天然气最大容许水含量参数,准确测量和计算天然气-水合物相平衡时的气相水含量具有重要意义。在压力为3.44~6.00 MPa、温度为270.00~274.00 K的条件下,通过实验测量和模型预测研究了甲烷-水合物相平衡时的气相水含量。结果表明,相比于压力露点,常压露点和气相水含量体积比随温度和压力的变化都具有规律性,气相水含量随温度的降低和压力的升高而减小。在实验的基础上,基于热力学相平衡理论建立了甲烷-水合物相平衡时的气相水含量热力学模型,气相水含量体积比的模型预测值与实验值的平均相对偏差为2.33%。该实验方法实现了甲烷-水合物相平衡体系气相水含量的原位测量,建立的热力学模型相比于通过查图获得的甲烷-液态水相平衡时的饱和水含量再外推至水合物区的方法更快速和准确。 展开更多
关键词 水合物 甲烷 相平衡 气相水含量 热力学模型
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Mn含量对Inconel718板材焊接接头组织性能的影响
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作者 杨亚倩 马帅 +3 位作者 王惠生 杨晓东 梁田 马颖澈 《特殊钢》 2024年第3期96-104,共9页
采用w[Mn]<0.01%、0.24%、0.34%三种不同合金的固溶态Inconel718热轧板材进行直流脉冲电弧焊接,经双级热时效处理后进行室温拉伸实验,研究Mn含量的变化对焊接接头微观组织及时效态力学性能影响规律。结果表明,三种不同Mn含量焊接接... 采用w[Mn]<0.01%、0.24%、0.34%三种不同合金的固溶态Inconel718热轧板材进行直流脉冲电弧焊接,经双级热时效处理后进行室温拉伸实验,研究Mn含量的变化对焊接接头微观组织及时效态力学性能影响规律。结果表明,三种不同Mn含量焊接接头组织中只存在Laves相,没有δ相析出,随着w[Mn]由<0.01%提高至0.34%,焊接接头中Laves相析出体积分数略有增多。经过双级热时效处理后,γ’’开始析出,焊接接头组织中Laves相含量略有减少。与时效态母材拉伸性能相比,焊接接头拉伸强度和伸长率有所降低。且随着Mn含量的增加,时效态焊接接头拉伸性能略有降低,抗拉强度由1250 MPa小幅降低至1178 MPa和1213 MPa,三种不同Mn含量的焊接接头时效态拉伸样品断裂位置皆为焊缝区域,且均为韧性断裂。 展开更多
关键词 INCONEL718合金 MN含量 LAVES相 焊接性能 板材
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湖南不同草地类植被的营养价值评价
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作者 何鹏亮 揭红东 +5 位作者 朱宁静 赵龙 许妍 石玉玲 邢虎成 揭雨成 《中国草地学报》 CSCD 北大核心 2024年第11期141-150,共10页
为了探究湖南不同草地类植被的营养成分含量特征,并对其营养价值进行科学评价,以4种不同草地类植被为研究对象,测定植物干物质、粗蛋白、粗脂肪、粗纤维、粗灰分、无氮浸出物等营养成分含量,并运用灰色关联度法进行综合评价。结果表明:... 为了探究湖南不同草地类植被的营养成分含量特征,并对其营养价值进行科学评价,以4种不同草地类植被为研究对象,测定植物干物质、粗蛋白、粗脂肪、粗纤维、粗灰分、无氮浸出物等营养成分含量,并运用灰色关联度法进行综合评价。结果表明:各草地类的干物质含量为26.44%~30.38%,粗蛋白含量为9.31%~12.03%,粗脂肪含量为1.88%~2.71%,粗纤维含量为29.00%~33.00%,粗灰分含量为10.28%~10.89%,无氮浸出物含量为43.15%~46.37%,山地草甸的干物质含量(30.38%)最高,低地草甸的粗蛋白含量(12.03%)最高,热性灌草丛的粗脂肪和无氮浸出物含量(2.71%和46.37%)最高,粗纤维含量(29.00%)最低,暖性灌草丛的粗灰分含量(10.28%)最低。各草地类的营养价值大小排序为:热性灌草丛>低地草甸>山地草甸>暖性灌草丛。 展开更多
关键词 湖南草地 营养生长期 营养成分含量 营养价值 灰色关联度法
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