摘要
以锆英石、氧化硼、活性炭为原料,采用碳热还原合成工艺制备了ZrB2—SiC复合粉体,并对合成过程进行了热力学分析。考察了反应温度及原料配比对碳热还原合成ZrB2—SiC复合粉体的物相的组成、含量和显微结构的影响。结果表明:提高反应温度有利于ZrB2—SiC复合粉体的合成,适当过量氧化硼及活性炭有利于ZrB2—SiC复合粉体的合成。合成ZrB2—SiC复合粉体的最优参数为:当ZrSiO4、B2O3和C的摩尔比为1∶2∶12,在1 773K保温3h,可得到几乎纯相的ZrB2—SiC复合粉体。
ZrB2-SiC composite powders were prepared via carbothermal reduction of zircon with activated carbon and boron oxide as starting materials.The thermodynamic analysis of the reaction synthetic process of ZrB2-SiC was carried out.The effects of reacting temperature,ratios of zircon to boron oxide and zircon to activated carbon in the synthesis process on the phase composition,contents of the crystalline phase and microstructure of ZrB2-SiC composite powders were investigated.The results indicate that the synthesis of ZrB2-SiC composite powders can be enhanced when the reaction temperature is increased,and ZrB2-SiC powders can be synthesized when the boron oxide and activated carbon are added at the reaction temperature of 1 773 K and the reaction duration of 3 h.
出处
《硅酸盐学报》
EI
CAS
CSCD
北大核心
2014年第6期779-784,共6页
Journal of The Chinese Ceramic Society
基金
国家自然科学基金面上项目(51272188)
湖北省自然科学基金项目(2013CFA086)
湖北省科技支撑计划对外科技合作项目(2013BHE002)
关键词
锆英石
碳热还原
硼化锆
碳化硅
复合粉体
zircon
carbothermal reduction
zirconium diboride
silicon carbide
composite powder
