Jeong Young-Keun, Bang Su-Ryong, Oh Sung-Tag
J Nanosci Nanotechnol. 2016 Feb;16(2):1993-5. doi: 10.1166/jnn.2016.11957.
Cu-70 vol% SIC composites with dense microstructure and sound interface between Cu and SIC grains were fabricated by solution chemistry route and spark plasma sintering. Two methods for developing powder mixtures of Cu and uncoated or pre-coated SIC were compared on the basis of the resulting microstructures. The pre-coating of Si(Al)OC onto SiC powders was prepared by curing and pyrolysis of Al-modified polycarbosilane. SiC/Cu composites were obtained by hydrogen reduction and densified using spark plasma sintering of pre-coated SIC and Cu-nitrate powder mixtures. The powder mixture showed a homogenous dispersion of nano-sized Cu particles on the surface of SIC powers. Microstructural observation revealed that the sintered composite using powder mixture with pre-coating of Al-PCS onto SiC powders showed dense microstructure and good contact between Cu and SIC grains due to the improved wettability by barrier coating. The results suggested that the SiC/Cu composite with required microstructural characteristics can be fabricated by using Al-PCS coated SIC powder mixture, more effectively.
通过溶液化学法和放电等离子烧结制备了具有致密微观结构且铜与碳化硅晶粒间界面良好的70体积%铜-碳化硅复合材料。基于所得微观结构，比较了两种制备铜与未涂层或预涂层碳化硅粉末混合物的方法。通过对铝改性聚碳硅烷进行固化和热解，在碳化硅粉末上制备了硅（铝）氧碳预涂层。通过氢气还原获得碳化硅/铜复合材料，并使用预涂层碳化硅和硝酸铜粉末混合物的放电等离子烧结进行致密化处理。该粉末混合物在碳化硅粉末表面呈现出纳米级铜颗粒的均匀分散。微观结构观察表明，使用在碳化硅粉末上预涂覆铝-聚碳硅烷的粉末混合物烧结而成的复合材料具有致密的微观结构，并且由于阻挡涂层提高了润湿性，铜与碳化硅晶粒之间具有良好的接触。结果表明，使用铝-聚碳硅烷涂层碳化硅粉末混合物能够更有效地制备具有所需微观结构特征的碳化硅/铜复合材料。
