摘要
以工业硅藻土(DE)和酚醛树脂(PF)为原料,Ni(NO_3)_2·6H_2O为催化剂前驱体,采用催化反应的方法制备了碳化硅粉体。研究了反应温度、反应时间和催化剂用量等对合成碳化硅粉体的影响,采用XRD、SEM和TEM分析了产物的物相组成和显微结构。结果表明:当添加1.5%(质量分数,下同)的Ni作催化剂时,1400℃保温3 h后即可合成纯相的β-Si C;相比之下,无催化剂存在时,1400℃反应3 h后β-Si C的产率仅为17%;所合成的β-Si C为颗粒状,其粒径大部分在100 nm以下。
β-SiC powders were synthesized at 1400 ℃ for 3 h in Ar atmosphere via a catalytic reaction method using industrial diatomite powders and phenolic resin as raw materials, and nickel nitrate as a catalyst precursor. The effects of temperature, holding time and catalyst content on the formation of the SiC powders were investigated. XRD, SEM and TEM analyses were employed to characterize the phase composition and microstructure of the final products. The results indicate that the β-SiC can be synthesized at 1400 ℃ for 3 h with 1.5 wt% Ni as catalysts. In contrast, for the sample without Ni catalysts, the yield of β-SiC is only 17 wt% in the final products under the identical condition. The as-prepared β-SiC are granular in morphology, and the particle sizes are less than 100 nm.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2018年第S1期95-98,共4页
Rare Metal Materials and Engineering
基金
国家自然科学基金面上项目(51472184
51472185)
湖北省教育厅高等学校优秀中青年科技创新团队计划(T201602)
关键词
硅藻土
Β-SIC
催化反应
低温合成
diatomite
β-SiC
catalytic reaction
low temperature synthesis
