期刊文献+
共找到9篇文章
< 1 >
每页显示 20 50 100
抗腐槽橡胶内衬的高频火花检漏
1
作者 周锦坤 《无损检测》 北大核心 1989年第8期234-235,共2页
现代工业材料表面处理及化学工业用抗腐槽(抗腐罐)往往用金属外槽加非金属内衬构成。如内衬有局部渗漏,将危及整个槽的使用寿命,内衬橡胶或塑料接缝处容易出现气孔、间隙、未胶合等缺陷而产生渗漏现象。在容器检漏技术中,国内外有采用... 现代工业材料表面处理及化学工业用抗腐槽(抗腐罐)往往用金属外槽加非金属内衬构成。如内衬有局部渗漏,将危及整个槽的使用寿命,内衬橡胶或塑料接缝处容易出现气孔、间隙、未胶合等缺陷而产生渗漏现象。在容器检漏技术中,国内外有采用质谱检漏、光谱检漏、渗液检漏、气密性检漏、卤素检漏、放射性同位素检漏等,一般检测工艺复杂、成本较高。针对检测对象是金属外壳加非金属绝缘橡胶内衬特点,我们试验用高频电火花检漏,既简单方便,又直观可靠。 展开更多
关键词 腐槽 橡胶内衬 电火花 检测
下载PDF
优化腐槽工艺、提高表面钝化膜质量从而提高产品生产率
2
作者 孙海萍 《黑龙江科技信息》 2008年第30期31-31,共1页
随着航天、航空等国家重点工程对军用电子元器件质量可靠性的保证要求的不断提高,我厂为求得企业的生存与发展,全厂各部门都在技术更新,其中我厂在腐槽工艺上存在着一些问题,为改善这一现状,我选择"优化腐槽工艺、提高表面钝化膜... 随着航天、航空等国家重点工程对军用电子元器件质量可靠性的保证要求的不断提高,我厂为求得企业的生存与发展,全厂各部门都在技术更新,其中我厂在腐槽工艺上存在着一些问题,为改善这一现状,我选择"优化腐槽工艺、提高表面钝化膜质量从而提高产品生产率"为论文研究内容。 展开更多
关键词 腐槽 玻璃钝化 工程能力指数 浮胶
下载PDF
骨槽风辨治五法
3
作者 许振亚 《辽宁中医杂志》 CAS 北大核心 1990年第2期29-30,共2页
骨槽风又名穿腮毒,病在骨之牙槽,以牙槽骨腐溃或有死骨可见也。《医宗金鉴》云:“起于耳前,连及腮颊,筋骨隐痛,日久腐溃,腮之里外筋骨,仍然漫肿硬痛,牙关拘急,皆由邪风深袭筋骨故也。”稽其病机:《证治准绳》云:“由忧愁思虑恐悲伤所致”。
关键词 中医治疗
下载PDF
Localized dissolution initiated at single and clustered intermetallic particles during immersion of Al-Cu-Mg alloy in sodium chloride solution
4
作者 骆晨 Xiaorong ZHOU George E.THOMPSON 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2016年第11期2800-2809,共10页
Aiming at understanding how intermetallic phases response when AA2024-T3 aluminium alloy is exposed to chloridecontainingaqueous medium, scanning electron microscopy was employed to provide morphological information o... Aiming at understanding how intermetallic phases response when AA2024-T3 aluminium alloy is exposed to chloridecontainingaqueous medium, scanning electron microscopy was employed to provide morphological information on alloy surfacebefore and after corrosion testing. Energy dispersive X-ray spectroscopy was carried out to determine compositional change inintermetallic particles. Atomic force microscopy was used to examine topographical variation introduced by the reactions ofintermetallic phases. Transmission electron microscopy combined with ultramicrotomy was carried out on dealloyed Al2CuMgparticles and their periphery region. It is found that dealloyed Al2CuMg particles exhibited porous, polycrystalline structurecomprised of body-centred cubic copper particles with sizes of 5 to 20 nm. Aluminium matrix started to trench in the periphery ofAl2CuMg particles at the early stage of dealloying. Development of trenching in Al.Cu.Fe.Mn.(Si) particle’s periphery was notuniform and took longer time to initiate than Al2CuMg dealloying. Localized corrosion at a cluster of Al2CuMg and Al2Cu particleswas mainly associated with Al2CuMg particles. 展开更多
关键词 aluminium alloy intermetallic particle localized dissolution DEALLOYING TRENCHING
下载PDF
Current Efficiency, Corrosion and Structural Changes in SnO2-Sb2O3-CuO Inert Anodes for Aluminium Electrolysis 被引量:2
5
作者 Ana-Maria Popescu Virgil Constantin 《Chinese Journal of Chemical Physics》 SCIE CAS CSCD 2014年第3期368-372,共5页
A systematic study was conducted on current efficiency (CE), corrosion and structural changes in SnO2-based inert anodes (made of 96wt%SnO2+2wt%Sb2O3+2wt%CuO) on a laboratory Hall-Heroult aluminium cell. The inf... A systematic study was conducted on current efficiency (CE), corrosion and structural changes in SnO2-based inert anodes (made of 96wt%SnO2+2wt%Sb2O3+2wt%CuO) on a laboratory Hall-Heroult aluminium cell. The influence of operating parameters and electrolyte composition on the CE and corrosion process were evaluated. The CE was found to be more than 90% and catastrophic corrosion took place at low percent of Al2O3, high percent of LiF, low cryolite ratio and high current densities. From all the structural changes that took place in the SnO2-based inert anodes, we assumed that the most important contribution was due to the migration of CuO towards the outer limits of the constituent grains of SnO2 based ceramic. The complex process occurred during the formation of various phases and their sintering ability both directly depended on Cu/Sb molar ratio. 展开更多
关键词 Inert anode Aluminium electrowinning Current efficiency
下载PDF
Ammonia corrosion analysis of copper tubes and experimental research on non-copper improvement for heat exchanger in power plant
6
作者 ZENG Zhou-hua LONG Xin-feng LIANG Ping 《Journal of Chemistry and Chemical Engineering》 2009年第12期30-36,共7页
Ammonia corrosion in copper tube will affect the safety of boiler running in power plant. Therefore, no copper in heating system has become a technical orientation in heat exchanger reconstruction, This paper analy... Ammonia corrosion in copper tube will affect the safety of boiler running in power plant. Therefore, no copper in heating system has become a technical orientation in heat exchanger reconstruction, This paper analyzes the condition and mechanism of ammonia corrosion occurring in copper tube used in coal-fired power plants. Using a general steam condensation testing equipment only for horizontal single tube, with water vapor and water as working fluid, on two types of steel tube with 2-side enhancement heat transfer, namely, a spirally fluted tube and a ratchet tube with internal spiral groove (RISG tube) which was developed recently, a set of experimental tests are conducted to investigate the characteristics of heat transfer and hydromeehanics. In order to compare easily, both one copper smooth tube and one steel smooth tube are also used in the experiment. The experimental results, which get from single horizontal tube, show that the overall heat transfer coefficient of steel spirally fluted tube are improved by 10%o to 17%, and that of the steel RISG tube(22%-28%) is better than steel spirally fluted tube, its flow resistance coefficient is only increased by 22% to 66% when compared with smooth tube. Based on a lot of experimental data, the steel spirally fluted tube and the steel RISG tube were applied in a low pressure preheater and an oil-cooler of some or other power plant respectively. The field testing results showed that their heat transfer coefficient with each types of enhancement heat transfer tubes were improved by 2.5% and 21%-45% comparing with copper smooth tube heat exchangers. Both basic and field experiment indicates that the steel tube with 2-side enhancement heat transfer is an ideal choice for heat exchanger reconstruction in no copper issue in power plants. 展开更多
关键词 spirally fluted tube ratchet tube with internal spiralgroove heat transfer enhancement copper corrosion low-pressure preheater oil cooler no copper in heating system
下载PDF
Influence of the operating parameters over the current efficiency and corrosion rate in the Hall–Heroult aluminum cell with tin oxide anode substrate material 被引量:2
7
作者 Virgil Constantin 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2015年第4期722-726,共5页
A systematic laboratory study was conducted on current efficiency and corrosion obtained in cryolite-alumina melts with SnO2-Sb203-CuO ceramic inert anodes. The current efficiency (CE) was determined by measuring th... A systematic laboratory study was conducted on current efficiency and corrosion obtained in cryolite-alumina melts with SnO2-Sb203-CuO ceramic inert anodes. The current efficiency (CE) was determined by measuring the total amount of oxygen evolved at the anode and was found to be ~ 95%. The influence of operating parameters (inter-elec- trode distance, temperature and current density) was evaluated. The quantitative interdependencies as well as the ranges of CE optima[ values were established (2-3 cm, 940-960 ℃ and 0.7-0.8 A.cm 2). The corrosion process of these anodes was evaluated by the mass loss method. The evaluation also took care of the corrosion data, as the prob- lem of the anode corrosion appeared to be the main obstacle for the use of those anodes in the commercial cells.Low-ering of the ACD up to 2 cm did not aggravate anode corrosion. 展开更多
关键词 Aluminum electrolysisCurrent efficiencyCorrosionInert anodes
下载PDF
Two-step gate-recess process combining selective wet-etching and digital wet-etching for InAIAs/InGaAs InP-based HEMTs 被引量:1
8
作者 Ying-hui ZHONG Shu-xiang SUN +5 位作者 Wen-bin WONG Hai-li WANG Xiao-ming LIU Zhi-yong DUAN Peng DING Zhi JIN 《Frontiers of Information Technology & Electronic Engineering》 SCIE EI CSCD 2017年第8期1180-1185,共6页
A two-step gate-recess process combining high selective wet-etching and non-selective digital wet-etching techniques has been proposed for InAlAs/InGaAs InP-based high electron mobility transistors (HEMTs). High etc... A two-step gate-recess process combining high selective wet-etching and non-selective digital wet-etching techniques has been proposed for InAlAs/InGaAs InP-based high electron mobility transistors (HEMTs). High etching-selectivity ratio of InGaAs to InA1As material larger than 100 is achieved by using mixture solution of succinic acid and hydrogen peroxide (H202). Selective wet-etching is validated in the gate-recess process of InA1As/InGaAs InP-based HEMTs, which proceeds and auto- matically stops at the InA1As barrier layer. The non-selective digital wet-etching process is developed using a separately controlled oxidation/de-oxidation technique, and during each digital etching cycle 1.2 nm InAIAs material is removed. The two-step gate-recess etching technique has been successfully incorporated into device fabrication. Digital wet-etching is repeated for two cycles with about 3 nm InAIAs barrier layer being etched off. InP-based HEMTs have demonstrated superior extrinsic trans- conductance and RF characteristics to devices fabricated during only the selective gate-recess etching process because of the smaller gate to channel distance. 展开更多
关键词 High electron mobility transistors (HEMTs) Gate-recess Digital wet-etching Selective wet-etching
原文传递
Corrosion resistance and cytocompatibility of Ti-20Zr-10Nb-4Ta alloy surface modified by a focused fiber laser 被引量:2
9
作者 Xianda Xue Chengpeng Ma +2 位作者 Hongjuan An Yan Li Yingchun Guan 《Science China Materials》 SCIE EI CSCD 2018年第4期516-524,共9页
The corrosion resistance and cytocompatibility of Ti-20 Zr-10 Nb-4 Ta(TZNT) alloy modified by surface laser treatment were investigated. The scanning electron microscopy(SEM) measurements indicated that laser trea... The corrosion resistance and cytocompatibility of Ti-20 Zr-10 Nb-4 Ta(TZNT) alloy modified by surface laser treatment were investigated. The scanning electron microscopy(SEM) measurements indicated that laser treatment on TZNT alloy generated groove morphologies with the width of^40 μm and the depth of ~10 μm on the surface. The water contact angles along the groove direction decreased by 51%compared with that of the untreated alloy. The laser treatment promoted the oxidation of metallic Ti, Zr and Nb and produced more stable oxides on surface. The corrosion potential increased by 50% and corrosion current density decreased by72% compared with that of the untreated alloy in the anodic polarization test for the alloy in Hank’s solution at 37°C. This indicated the improvement of the corrosion resistance by laser treatment. The cytotoxicity testing results showed that the laser-treated TZNT alloy performed similar MC3 T3-E1 cell viability compared with the untreated alloy. The cells displayed oriented growth along the groove direction due to the increased hydrophilicity. This novel material may be a new candidate in orthopedics and dentistry implantations fields. 展开更多
关键词 laser Ti-20Zr-10Nb-4Ta corrosion resistance CYTOCOMPATIBILITY
原文传递
上一页 1 下一页 到第
使用帮助 返回顶部