(Ti,W)(B,C,N)纳米晶粉末的合成  

Synthesis of Nanocrystalline (Ti,W)(B,C,N) Powders

作　　者：张正权[1] 金永中[1] 王睿贤 尹植 张永强[1] 姜伦[1] 周焕林[1] 

机构地区：[1]四川理工学院材料科学与工程学院,四川自贡643000

出　　处：《稀有金属与硬质合金》2017年第3期20-24,共5页Rare Metals and Cemented Carbides

基　　金：四川省教育厅重点项目(15ZA0232);自贡市科技局重点项目(2015HX19;15ZA0232);四川理工学院科研培育项目(2014PY10)

摘　　要：以偏钛酸、偏钨酸铵、木糖、硼酸为原料,采用"前驱体+碳热还原"法合成了(Ti,W)(B,C,N)纳米晶粉末。利用SEM、XRD等表征产物相组成和显微形貌,重点探讨了合成温度、保温时间对合成产物的影响。结果表明,合成温度、保温时间均对(Ti,W)(B,C,N)粉末合成有显著影响,随着合成温度的提高以及保温时间的延长,合成粉末晶粒尺寸呈明显长大趋势。在合成温度1 200℃,保温时间2h条件下成功合成了晶粒度约为21.3nm的(Ti,W)(B,C,N)纳米晶粉末。与传统的"普通球磨+碳热还原"法比较,"前驱体+碳热还原"法显著降低了合成温度,并具有原料成本低廉的优势。Nanocrystalline （Ti,W）（B,C,N） powders were prepared by precursor plus carbothermal reduction with metatitanic acid,ammonium metatungstate,xylose and boracic acid as the materials. Phase composition and microstructure of the products were characterized by SEM and XRD. The effects of synthesis temperature and holding time on reaction products were discussed. The results show that both synthesis temperature and holding time have obvious effects on the synthesis of （Ti,W）（B,C,N） powders. With the increase of synthesis temperature and holding time, synthetic powder grains significantly grow up. Nano- crystalline （Ti,W）（B,C,N） powders with grain size of 21.3 nm are successfully prepared at 1 200 ℃ for 2 h. Compared with the traditional method of ordinary ball milling plus carbothermal reduction, the method of precursor plus carbothermal reduction can significantly reduce synthesis temperature with an advantage of low cost of raw materials.

关 键 词：(Ti W)(B C N) 纳米晶粉末 前驱体 碳热还原 物相组成 显微形貌 

分 类 号：TF123[冶金工程—粉末冶金]