Development of surface modification technique for ceramic reinforcements by metallic nanopartiles and the application to MMCs

研究了化学镀法制备Cu和Ni纳米粒子的工艺。通过控制电镀条件来控制纳米颗粒的大小。对Cu纳米粒子修饰的氧化铝增强粒子进行热处理后，Cu纳米粒子转变为CuO纳米粒子。铝热剂处理使铝合金熔体自发渗透到CuO纳米粒子修饰的氧化铝颗粒层中，从而改善了氧化铝与铝合金熔体之间的润湿性。结果表明，具有高比表面积的Cu纳米粒子容易与铝合金熔体发生氧化反应，导致自发渗透。

Fabrication process of Cu and Ni nanoparticles by electroless plating method were developed. The size of the nanoparticles was controlled by controlling the plating conditions. When alumina particle reinforcements modified by Cu nanoparticles were heat-treated, the Cu nanoparticles were changed to CuO nanoparticles. Al alloy melt was infiltrated spontaneously into the alumina particle layer modified by CuO nanoparticles due to the thermite process resulting the improvement of the wettability between alumina and Al alloy melt. It is suggested that Cu nanopartiles having high specific surface area would be oxidized and reacted with Al alloy melt easily and resulted in the spontaneous infiltration.