共沉淀-热分解法制备金刚石工具用预合金粉  

Preparation of prealloyed powder for diamond tools by coprecipitation-thermal decomposition method

作　　者：向波[1] 贺跃辉[1] 谢志刚[1] 黄艳华[1] 

机构地区：[1]中南大学粉末冶金国家重点实验室,长沙410083

出　　处：《粉末冶金技术》2008年第1期44-48,共5页Powder Metallurgy Technology

基　　金：广西科学研究与技术开发计划项目资助(桂科能05112001-2B1)

摘　　要：研究用共沉淀-热分解法制备金刚石工具胎体用预合金粉,其中包括共沉淀反应pH值、反应温度和热分解反应温度等对粉末收得率和粒度等方面的影响。采用XRD和SEM对粉末物相组成和形貌进行了分析,同时采用激光衍射粒度分析仪对预合金粉粒度分布进行了分析。研究结果表明:采用共沉淀-热分解法可以制备出良好的预合金化粉末,粉末呈棒状和不规则形状,粉末粒度较细,分布比较均匀、集中;粉末收得率随着共沉淀反应pH值的增大而提高,在pH值约等于9.8时达最大值;随着共沉淀反应温度的升高,粉末粒度逐渐增大;随着前驱体热分解反应温度的升高,粉末粒度逐渐增大。Prealloyed powder was prepared by coprecipitation-thermal decompostion. The effects of pH value, temperature of eoprecipitation and temperature of thermal decomposition on the yield and the particle size of the prealloyed powder were analyzed.The powder morphology and composition were analysed by X-ray diffraction （XRD） and scanning electronic microscope （SEM）, the distribution of particle size was analysed by Mastersizer. The results show that, the goad prealloyed powder prepared by eoprecipitation-thermal decomposition is dub-shaped and irregular-shaped, the particle size is small and the distribution of particle size is tignt. The yield of powder increases with increasing the pH value of coprecipitation, and the biggest yiel is at about pH value of 9.8. The particle size increases with increasing the temperature of coprecipitation. With temperature of thermal decomposition increasing, oxygen content of powder decrease, but the particle size increases.

关 键 词：共沉淀-热分解法 预合金粉 制备 

分 类 号：TF123.71[冶金工程—粉末冶金] S816.71[冶金工程—冶金物理化学]