碳热还原氮化高岭土合成 Sialon 粉末

来源期刊：中国有色金属学报1998年第1期

论文作者：张宏泉 戴英 李晔 李凝芳

文章页码：140 - 144

关键词：β′-Sialon 碳热还原氮化 高岭土

Key words：β'-Sialon , carbothermal reduction-nitridation , kaolinite

摘    要：以高岭土为原料， CaF₂ 和Na₂ CO₃为添加剂， 在 1400℃保温4h, 通过碳热还原氮化法合成了β′-Sialon粉末。 XRD、 SEM、 XPS等测试手段对合成产物的测试结果表 明：控制适当的C含量不仅可以合成质量较好的β′-Sialon(Z=3),而且可以 避免产物 中生成FeSi_x 。 详细地讨论了CaF₂和Na₂CO₃添加剂及其它工艺因素对合成 Sialon的影响与作用， 并探讨了β′-Sialon的形成过程。

Abstract: β' -Sialon was synthesized by adding CaF₂ and Na₂CO₃ additives in the condition of 1400℃ and holding 4h through the carbothermal reduction-nitridation of kaolinite. The products were analysed by XRD, XPS, SEM techniques. It was shown that not only high quality β'-Sialon with Z=3 can be synthesized by controlling appropriate carbon content,but also the formation of FeSi_x phase in the products can be avoided. The effect of CaF₂ and Na₂CO₃ additives as well as t he reaction conditions on the synthesis of Sialon were investigated. The formation of β'-Sialon were also discussed in detail.