Effect of processing parameters on the microstructure and thermal conductivity of diamond/Ag composites fabricated by spark plasma sintering

Diamond/metal composites with 50 vol.% diamond have been produced by spark plasma sintering（SPS） using pure Ag as a matrix and diamond particles as reinforcement.Three kinds of powder mixing processes were used to prepare the mixture of diamond/Ag powders：dry mixing without milling medium,wet mixing...

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Bibliographic Details
Published in:Rare metals 2010-12, Vol.29 (6), p.625-629
Main Authors: Gao, Wenjia, Jia, Chengchang, Jia, Xian, Liang, Xuebing, Chu, Ke, Zhang, Luman, Huang, Hai, Liu, Meng
Format: Article
Language:English
Subjects:
Biomaterials
Blending
Chemistry and Materials Science
Drying
Energy
Heat transfer
Materials Engineering
Materials Science
Metallic Materials
Microstructure
Nanoscale Science and Technology
Physical Chemistry
Polymer matrix composites
Process parameters
Silver
Spark plasma sintering
Thermal conductivity
优化工艺参数
微观结构
放电等离子烧结
热导率
粉末混合物
金刚石颗粒
银复合材料
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Summary:Diamond/metal composites with 50 vol.% diamond have been produced by spark plasma sintering（SPS） using pure Ag as a matrix and diamond particles as reinforcement.Three kinds of powder mixing processes were used to prepare the mixture of diamond/Ag powders：dry mixing without milling medium,wet mixing and magnetic blending.Subsequently,they were all consolidated by SPS at various processing parameters to produce bulk diamond/Ag composites.Then samples were heat treated in order to obtain a higher thermal conductivity.The effect of processing parameters on the morphologies of the mixed powders,the microstructure and the thermal conductivity of the composites were investigated by comparing the experimental data.It reveals that particles were easy to agglomerate and the distribution of mixed powders was inhomogeneous by dry mixing method,and wet mixing method is too complex.The most favorable mixing process is magnetic blending by which the powders can be homogenously mixed and the composites prepared by optimized SPS processing parameters can obtain the highest relative density and the best thermal conductivity among the composites prepared by different processes.The magnetic blending diamond/Ag composites even have a 23% increase in thermal conductivity compared with pure silver sintered by SPS.
ISSN:1001-0521
1867-7185
DOI:10.1007/s12598-010-0182-4