作者：WANG Huifang,LI Haisheng,ZHANG Haijun,BI Yubao,..

作者单位：1Wuhan UST,2Henan UST,3University of Exeter

会议录名称：Conference on Refractories International 2018

出版年：2018-10-17

起页：1

止页：1

总页数：1

馆藏号：

分类号：TQ175

语种：英文

会议名称：Conference on Refractories International 2018

会议地点：中国浙江杭州

会议时间：2018-10-17

会议主办者：中钢集团洛阳耐火材料研究院,中国金属学会耐火材料分会,耐火材料杂志社,先进耐火材料国家重点实验室

关键词：self-bonded SiC refractories,3C-SiC nanowires,Fe nanoparticle catalysts

内容简介

3C-SiC was catalytically synthesized with 1 wt% Fe nanoparticles in diameter of 5 nm at 1573 K for 3 h in flow Ar using expanded graphite and Si powders as starting materials; for comparison, the content of 3C-SiC was only 50 wt% in the sample without any catalysts. First-principles calculations suggested that metal nanoparticals accelerated the 3C-SiC formation via weakening the bond strength in C=C dimer, and CO and SiO molecules absorbed onto the metal catalysts. According to these results, self-bonded SiC refractories were catalytically prepared using Fe NP as catalysts and black SiC grain, expanded graphite and Si powders as raw materials. Both mechanical strength (MOR of 32.2 MPa at 1673 K) and thermal shock resistance of as-prepared self-bonded SiC refractories were increased significantly compared with the specimens without catalysts.