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Microstructure Characteristics of SiC Particle-Reinforced Aluminum Matrix Composites Coatings by Cold Spraying

稀有金属材料与工程 2012年第S1期41卷 460-463页

作者： Wang Hongtao Ji Gangchang Chen Xiao Bai Xiaobo Chen Qinyu jiujiang univ Jiujiang Key Lab Green Remfg Jiujiang 332005 Peoples R China

A dense Al/SiCp composite coating with high volume fraction(60%)of nano SiCp reinforcement was fabricated by cold spraying of ball-milled Al-60SiCp composite *** morphologies evolution of the Al-60SiCp composite powder during ball milling and the microstructure and microhardness of the cold-sprayed Al-60SiCp composite coating were *** results show that Al particles undergone fracture deformation and nano SiC particles are uniformly distributed in soft Al matrix after ball milling.A dense Al-60SiCp composite coating can be fabricated by cold spraying of ball milled composite *** SiC particles in the cold-sprayed Al-60SiCp composites coating exhibit a reasonably uniform *** Hv0.5 microhardness of the Al-60SiCp composite coating is reached up to(5.30±0.53)GPa due to the enhancement of SiC particles,compared to(0.34±0.03)GPa for the pure Al bulk.

关键词： cold spraying ball milling aluminum matrix composites microstructure

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Effects of Binder Phase Content and Substrate Hardness on Deposition Behavior of Cermet Particles in Cold Spraying Process

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稀有金属材料与工程 2012年第S1期41卷 384-387页

作者： Wang Hongtao Ji Gangchang Chen Xiao Chen Qinyu Bai Xiaobo jiujiang univ JiuJiang Key Lab Green Remfg Jiujiang 332005 Peoples R China

In this paper,three kinds of cermet particles with different binder phase and content,namely WC-12Co,WC-17Co and Cr3C2-25NiCr were deposited on the Q235 low carbon steel and WC-12Co coating substrates to investigate the effect of binder phase content and substrate hardness on deposition behavior of cermet particle during cold *** morphology of the deposited particles was examined by scanning electron microscopy(SEM)from the particle surface and *** was found that with increasing substrate hardness,the deposition behavior of cermet particles transformed from completely embedding into substrate to partially flattening and even *** the Co content from 12 wt%to 17 wt% influenced significantly the deposition deformation behavior of the WC-Co particles,the higher Co content brought about a fuller flattening of WC-Co ***,Cr3C2-25NiCr particle exhibited the relatively lower flattening ratio and significant rebounding of Cr3C2 even with the highest binder phase content,which may be attributed to the bigger Cr3C2 size and weak bonding between Cr3C2 and NiCr.

关键词： cold spraying ball milling aluminum matrix composites microstructure

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维普期刊数据库

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THE APPLICATION OF HOMOGENEOUS FUNCTION ANALYSIS TO RELATIVISTIC WkB APPROXIMATIONS

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Acta Mathematica Scientia 1992年第1期12卷 71-78页

作者：卢书城倪光炯 Dept. of Phys. Jiujiang Teacher's College Jiujiang 332000 China Dept. of Phys. Fudan Univ. Shanghai 200433 China

This paper illustrates how homogeneous function analysis can be generalized. to relativistic quantum mechanics for finding the WKB energy levels of Dirac particle in the positive power-law potentials (V = lambda-r(v), S = lambda'r(v), lambda, lambda', v > 0). The results show that the equation determining energy levels contains a product of hypergeometric function with some gamma functions, and the energy of particle is proportional to (2n(r) + l + 3/2) 2v/1 + v under the condition that the relativistic effect plays a principal role in contrast with the (2n(r) + l + 3/2) 2v/2 + v dependence in nonrelativistic case.

关键词： relativistic Dirac determining gamma finding proportional definitely paradox devoted fairly

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