粉末冶金法制备金刚石/铝复合材料导热性能的研究

Thermal Conductivity of Diamond/Al Composites Prepared Using Powder Metallurgy

摘要: 采用粉末冶金法制备金刚石/铝复合材料，研究金刚石颗粒体积分数、烧结温度对复合材料导热性能的影响。利用扫描电镜观察金刚石/铝复合材料组织形貌，采用阿基米德排水法和热导仪测试金刚石/铝复合材料的致密度及热导率。研究结果表明：当烧结温度为875℃，金刚石/铝复合材料组织致密，颗粒分布均匀。随烧结温度的升高，金刚石/铝复合材料热导率呈先增加后降低的趋势，当金刚石体积分数为20%，烧结温度为875℃，其热导率最高为243 W/（m·K）。

Abstract: Diamond/Al composites were prepared by powder metallurgy technology. The thermal properties of the composites with different volume fraction and sintering temperatures were investigated. The physical properties of diamond/Al composites were characterized by SEM, Archimede's method and Laser Flash Apparatus. The result show that when the sintering temperature is 875℃, the diamond/Al composites possesses high relative density, and the distribution of diamond particles are very uniformly. With the increase of the sintering temperatures, thermal conductivity of diamond/Al composites appears a downward trend after the first rise. With the diamond volume fraction of 20% and the sintering temperature of 875℃, the thermal conductivity of the composites is up to 243 W/(m·K).