高压氢还原法制备Ni包SiC粉末的研究  

Preparation of nickel-coated SiC powder by hydrogen reduction under high pressure

作　　者：章林[1] 曲选辉[1] 段柏华[1] 何新波[1] 罗铁钢[1] 

机构地区：[1]北京科技大学材料科学与工程学院,北京100083

出　　处：《粉末冶金技术》2008年第5期369-373,共5页Powder Metallurgy Technology

摘　　要：采用高压氢还原法制备了Ni包SiC复合粉末，研究了反应温度、氢分压、表面活性剂及包覆次数对包覆效果的影响，并且对该包覆粉末的热稳定性进行了评价。结果表明：在反应温度为150～160℃、氢分压为1．5～2．5MPa、活性剂的质量浓度为0．05g／L、搅拌速度为800r／min的条件下，包覆二次可以获得连续均匀的包覆层。包覆粉末在1150℃左右会发生反应，生成Ni2Si和C。Nickel-coated SiC powder was prepared by hydrogen reduction under high pressure. The key factors include the temperature, the partial pressure of hydrogen , the surfactant and the coating number of times. In order to get a nice nickel layer on the SiC surface, the optimum conditions are as follows： 150℃-165℃ of the reaction temperature. 1.5 ～ 2.5MPa of the hydrogen pressure, 800 r/min of the stirring speed and two times coating process. The thermal stability of the coated powder was studied, it is approved that Ni will react with SiC to form Ni2Si and C after heat treatment at 1150℃.

关 键 词：高压氢还原 表面涂层 复合粉末 镍包碳化硅 

分 类 号：TG174.44[金属学及工艺—金属表面处理] TF123.74[金属学及工艺—金属学]