摘要
以锆英石和活性炭为原料,采用微波碳热还原法制备了Zr C-Si C复合粉体,对其合成过程进行了热力学分析,并研究了反应温度、添加剂的用量和埋粉等工艺条件对合成的Zr C-Si C复合粉体的物相组成和显微结构的影响。结果表明,提高反应温度和在反应物中添加B2O3有助于促进Zr C-Si C复合粉体的合成,而将反应物埋入Si C粉对该复合粉体的合成则有抑制作用。与常规加热相比,微波加热法可以有效地降低碳热还原反应的起始温度,并且减少制备过程的时间和能耗。
ZrC-SiC composite powders were prepared by a microwave carbothermal reduction method using zircon and activated carbon as raw materials; thermodynamic calculation on the preparation of ZrC-SiC was also studied. The effects of heating temperature, embedded powders, and heating methods on the synthesis of ZrC-SiC composite powders(phase composition, contents of the crystalline phase and microstructure) were investigated. The results indicate that it would be favor to the synthesis of ZrC-SiC composite powders under the condition of increasing reaction temperature, using B_2O_3 as additive and without using SiC as embedded powders. Compared with the conventional heating method, the microwave heating process can decrease the reaction temperature, save the energy and reduce the cost.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2015年第S1期217-221,共5页
Rare Metal Materials and Engineering
基金
国家自然科学基金面上项目(51272188
51472184
51472185)
"973"计划前期研究专项(2014CB660802)
湖北省自然科学基金重点项目(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
微波碳热还原
碳化锆
碳化硅
复合粉体
zircon
microwave carbothermal reduction
zirconium carbide
silicon carbide
composite powder
