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国家自然科学基金(51171146)

作品数:8 被引量:32H指数:4
相关作者:王亚平卢雪琼周志明柴林江黄伟九更多>>
相关机构:西安交通大学重庆理工大学更多>>
发文基金:国家自然科学基金重庆市自然科学基金更多>>
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8 条 记 录,以下是 1-8
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纳米结构Al_2O_3/Cu复合材料的研究现状被引量:4
2017年
指出了Al_2O_3/Cu弥散强化复合材料制备过程中需要注意的问题:颗粒尺寸、界面和工艺;综述了制备Al_2O_3/Cu复合材料的传统方法 ,介绍了搅拌铸造法、机械合金化法、内氧化法和共沉淀法的工艺过程和工艺特点;对改进的制备方法,如反应球磨、化学镀、添加合金元素和稀土元素做出论述。最后指出今后Al_2O_3/Cu复合材料需关注的问题和研究方向。
张严
关键词:AL2O3/CU复合材料弥散强化
Surface modification of Cu-25Cr alloy induced by high current pulsed electron beam被引量:2
2015年
A Cu-25Cr alloy prepared by vacuum induction melting method was treated by the high current pulsed electron beam (HCPEB) with pulse numbers ranging from 1 to 100. Surface morphologies and microstructures of the alloy before and after the treatment were investigated by scanning electron microscopy and X-ray diffraction. The results show that significant surface modification can be induced by HCPEB with the pulse number reaching 10. Craters with typical morphologies on the Cu-25Cr alloy surface are formed due to the dynamic thermal field induced by the HCPEB. Micro-cracks, as a unique feature, are well revealed in the irradiated Cu-25Cr specimens and attributed to quasi-static thermal stresses accumulated along the specimen surface. The amount of cracks is found to increase with the pulse number and a preference of these cracks to Cr phases rather than Cu phases is also noted. Another characteristic produced by the HCPEB is the fine Cr spheroids, which are determined to be due to occurrence of liquid phase separation in the Cu-25Cr alloy. In addition, an examination on surface roughness of all specimens reveals that more pulses will produce a roughened surface, as a result of compromising the above features.
周志明柴林江肖志佩涂坚王亚平黄伟九
关键词:MICROSTRUCTURE
强流脉冲电子束表面改性CuFe10合金的显微组织和性能研究(英文)被引量:1
2015年
研究了不同脉冲次数强流脉冲电子束表面改性对CuFe10合金组织及性能的影响。强流脉冲电子束处理CuFe10合金的重熔表面出现了火山坑和直径为100nm到1μm的富铁球,表明了强流脉冲电子束处理CuFe10合金表面发生了液相分离。强流脉冲电子束脉冲轰击30次后,CuFe10合金表面的显微硬度与耐蚀性能均得到显著改善,主要是由于强流脉冲电子束轰击处理CuFe10合金表层引发的快速熔凝过程中表面发生了液相分离及晶粒细化的缘故。
周志明陈宝凤肖红梅涂坚柴林江黄伟九胡建军
关键词:强流脉冲电子束液相分离
Effect of La on arc erosion behaviors and oxidation resistance of Cu alloys被引量:3
2017年
Cu with and without La addition was prepared and the effect of a trace amount of La on the arc erosion behaviors and oxidation resistance of Cu alloys was investigated. The results indicate that CuLa alloy exhibits superior oxidation resistance and arc erosion resistance. The contact resistance and temperature rise were obviously improved. The oxidation resistance of CuLa alloy mainly is due to the interface wrapping of La2O3 particles and CuLa alloy phase on Cu atoms. Thermodynamic calculation indicated that La2O3 could form preferentially in the CuLa alloy, which was beneficial for the protection of the Cu substrate. According to kinetics analysis, the activation energy of CuLa alloy was higher than that of pure Cu, indicating the better oxidation resistance of CuLa alloys.
李海燕周轩卢雪琼王亚平
关键词:OXIDATION
铜及其合金高温氧化的影响因素研究被引量:9
2012年
综述了目前国内外铜合金高温氧化的研究现状;分析了纯金属铜的氧化机制;探讨了合金元素、晶粒尺寸和不同氧分压对提高铜合金高温氧化性能的影响。这对进一步研究铜合金高温氧化机理,寻找更好的抗高温氧化措施以及发展新型耐高温铜合金都具有重要的意义。
卢雪琼王军王亚平郭永利
关键词:铜合金高温氧化抗氧化能力
Evolution of surface microstructure of Cu-50Cr alloy treated by high current pulsed electron beam被引量:7
2015年
A Cu-50Cr alloy was treated by the high current pulsed electron beam(HCPEB)at 20 and 30 ke V with pulse numbers ranging from 1 to 100.Surface morphologies and microstructures of specimens before and after the treatments were investigated by employing scanning electron microscopy and X-ray diffraction.Results show that the HCPEB technique is able to induce remarkable surface modifications for the Cu-50Cr alloy.Cracks in Cr phases appear even after one-pulse treatment and their density always increases with the pulse number.Formation reason for these cracks is attributed to quasi-static thermal stresses accumulated along the specimen surface.Craters with typical morphologies are formed due to the dynamic thermal field induced by the HCPEB and they are found to prefer the sites near cracks or boundaries between neighboring Cr phases.Another microstructural characteristic produced by the HCPEB is the fine Cr spheroids,which are determined to be due to occurrence of liquid phase separation in the Cu-50Cr alloy.Finally,a general microstructural evolution profile that incorporates various HCPEB-induced surface features is tentatively outlined.
CHAI LinJiangZHOU ZhiMingXIAO ZhiPeiTU JianWANG YaPingHUANG WeiJiu
关键词:MICROSTRUCTURE
Impact of structure and flow-path on in situ synthesis of AlN: Dynamic microstructural evolution of Al-AlN-Si materials被引量:4
2018年
The AI-AIN-Si composites were prepared in the gas-in-liquid in situ synthesized flow-reaction-system, which was implemented by a powder metallurgy and reaction sin- tering route. The experimental results showed that A1-AIN- 50SiB material (prepared by ball-milling powders) and AI- AIN-50SiM material (prepared by mixing powders) exhibited the semi-continuous Si structures and the isolated Si islands, respectively. Subsequently, the AI-AIN-50Si materials were selected as the model materials by phase identification and microstructure analysis. The dynamic microstructural evolu- tion of AI-AIN-50Si materials was investigated using the computational fluid dynamics (CFD) method. Mathematical models and simulation results showed that the in situ synthesis of AIN was strongly influenced by the structure and the flow- path ((Cg,N2/lg,N2)+(Cs,AlN/ls,AiN)). The flow paths of AI-AIN-50Si^B material were restricted by the semi-continuous Si. These Si structures can promote the formation of the strong turbulence with gradually weakened fluctuation, so that the in situ synthesis of AIN was interconnected and surrounded by an interpenetrating Si network. In contrast, the flow paths of AI- AIN-50Si^B material can easily pass through the isolated Si due to its mild turbulence with linear relationship. As a result, AIN was separated by the isolated Si and agglomerated in the matrix. Overall, the present work provides new insights into dynamic microstructural evolution in in situ reaction sinter- ing systems.
Zhe WangXin WangYigang TongYaping Wang
冷喷涂AgSnO_2触点涂层的组织与性能被引量:4
2017年
采用高能球磨方法制备AgSnO_2复合粉末,将球磨粉末冷喷涂到铜基板上,能够获得几毫米厚度的较致密的AgSnO_2触点涂层。850℃退火后涂层发生进一步致密化并且在原始粉末颗粒边界形成富银区,涂层材料硬度略为降低。电弧侵蚀和电接触试验表明,冷喷涂的AgSnO_2涂层材料具有低而稳定的接触电阻,能够满足触点的基本性能要求。
李海燕李鹏王军王亚平
关键词:AGSNO2冷喷涂电弧侵蚀
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