摘要
以无水乙醇和水为分散介质,钛酸丁酯为钛源,采用溶胶-凝胶法在立方氮化硼(cBN)颗粒表面包覆TiO_2制备cBN-TiO_2复合粉,研究了无水乙醇与钛酸丁酯物质的量比、cBN与钛酸丁酯物质的量比对包覆效果的影响,对制备工艺进行了优化,并分析了最优工艺下cBN-TiO_2复合粉的抗氧化性能。结果表明:当无水乙醇与钛酸丁酯的物质的量的比为10∶1、cBN与钛酸丁酯的物质的量的比为1∶1时,cBN颗粒表面均匀地包覆了一层致密的TiO_2,包覆效果最好;最优工艺下cBN-TiO_2复合粉的开始氧化温度为900℃,比包覆TiO_2前cBN微粉的提高了220℃。
A layer of TiO2 was coated on the surface of cubic boron nitride（cBN）particles by sol-gel method with anhydrous ethanol and water as dispersion medium and with tetrabutyl titanate as titanium source,and then cBN-TiO2 composite powders were obtained.The effects of the molar ratio of anhydrous ethanol to butyl titanate and the molar ratio of cBN to butyl titanate on the coating effect were investigated.The preparation process was optimized.The oxidation resistance of cBN-TiO2 composite powder under optimal process was studied.The results show that the surface of cBN particles was coated with a layer of dense TiO2 uniformly when the molar ratio of anhydrous ethanol to butyl titanate was 10∶1 and the molar ratio of cubic boron nitride to butyl titanate was 1∶1,indicating the best coating effect.The initial oxidation temperature of cBN-TiO composite powder prepared under optimal process was 900 ℃,and was 220 ℃ higher than that of cBN micro powder before coating with TiO2.
作者
梁力行
王海龙
李剑
胡碧涌
邵刚
许红亮
卢红霞
范冰冰
张锐
LIANG Lixing;WANG Hailong;LI Jian;HU Biyong;SHAO Gang;XU Hongliang;LU Hongxia;FAN Bingbing;ZHANG Rui(School of Materials Science and Engineering,Zhengzhou University,Zhengzhou 450001,China;Zhengzhou University of Aeronautics,Zhengzhou 450015,China)
出处
《机械工程材料》
CAS
CSCD
北大核心
2018年第9期37-40,共4页
Materials For Mechanical Engineering
基金
河南省自然科学基金资助项目(162300410242)
郑州大学优秀青年教师发展基金资助项目(1421320044)
