铬包覆的金刚石颗粒增强铜基复合材料的热物理性能研究

Study on thermal-physical property of Cr-coated diamond particle reinforced copper matrix composite

通过混合熔盐法将NaCl、KCl、金刚石颗粒及微量活性物质铬粉按一定比例混合均匀后煅烧处理,经过充分清洗、过筛及干燥等工艺得到了铬包覆的金刚石颗粒;利用放电等离子烧制技术制备了具有优异热物理性能的铬包覆金刚石颗粒增强铜基复合散热材料。结果表明:采用该混合熔盐法能够实现金刚石颗粒表面铬全包覆;铬包覆的金刚石颗粒与铜基体金属材料的界面结合良好;采用放电等离子技术制备的铬包覆金刚石-铜基复合材料具有较高的相对密度、优异的热传导性能及相对较低的热膨胀系数。

Cr-coated diamond particles were obtained by blending evenly the raw materials including chromium powder,NaCl,KCl and diamond particles according to a certain proportion used the mixed molten salt method. Cr coated diamond particle reinforced Cu matrix composites with excellent thermal and physical properties were prepared by spark plasma sintering.The results showed that the chromium complete coating on the surface of diamond particles can be achieved by using the mixed molten salt method. The interracial bonding between Cr coated diamond particles and Cu matrix metallic materials was excellent. Cr-coated diamond/copper composites prepared by spark plasma sintering had high relative density,excellent thermal conductivity and relatively low thermal expansion coefficient.