期刊文献+
共找到1篇文章
< 1 >
每页显示 20 50 100
β-SiAlON Hollow Spheres Prepared from Coal Fly Ash Microspheres
1
作者 ZHANG Lei WANG Xueping +2 位作者 YANG Jiujun WANG Wenjuan YANG Fuzeng 《China's Refractories》 CAS 2009年第4期13-17,共5页
β-SiAION hollow spheres were prepared by carbothermal reduction method, using coal fly ash ( 〈 15 μm, 43 - 77 μm, and 〉 100 μm) and active carbon in Some proportion (20% less than theoretical addition, theore... β-SiAION hollow spheres were prepared by carbothermal reduction method, using coal fly ash ( 〈 15 μm, 43 - 77 μm, and 〉 100 μm) and active carbon in Some proportion (20% less than theoretical addition, theoretical addition and 10% excess theoretical addition) as starting materials, putting into alumina crucible in high temperature nitriding furnace after well mixed, and holding at 1 300 ℃, 1 350 ℃, 1 400 ℃, 1 450 ℃, and 1 500 ℃ for 6 h. Effects of temperature, particle size of the microsphere . and addition of active carbon on the phase composition and microstructure of the nitridized products were studied by means of XRD and SEM. The results show that the nitridation reaction starts at 1 300 ℃ ; excess active carbon is necessary to form β-SiAION hollow spheres, and particle size is the important parameter to form the hollow spheres nitridized products β-SiAION; at 1 500 ℃, when the active carbon is 10% in excess, the β-SiAlON hollow spheres, which were prepared using coal fly ash with particle size 〉 100 μm, are featured with rough surface, high hollowness and low density. 展开更多
关键词 Coal fly ash rnicrospheres Carbontherrnal reduction β-SIMON hollow sphere
下载PDF
上一页 1 下一页 到第
使用帮助 返回顶部