利用高铝粉煤灰合成β-Sialon粉体的实验研究  

The preparation of β-Sialon powder from high-alumina fly ash:an experimental study

作　　者：李金洪[1] 马鸿文[1] 吴秀文[1] 

机构地区：[1]中国地质大学矿物材料国家专业实验室,北京100083

出　　处：《岩石矿物学杂志》2005年第6期643-647,共5页Acta Petrologica et Mineralogica

基　　金：中国地质大学(北京)校内基金(51900961008);矿物材料国家专业实验室开放基金资助项目(04101)

摘　　要：在N2气氛中以粉煤灰为原料,采用碳热还原氮化工艺制备了β-Sialon粉体,研究了碳含量、合成反应温度、保温时间和氮气流量等因素对生成物物相的影响。在添加适量Al2O3、C含量23%、氮气流量2L/min、合成温度1450℃、保温时间为6h的条件下,可获得Z=3的纯晶相β-Sialon粉体,粒度均一,形态规则。β-Sialon粉体粒径在1～3μm之间,形态与结晶程度受合成条件影响。在不同的制备条件下,所合成的产物为β-Sialon和Al N、β-SiC、Si3N4、Al6Si2O13、O’-Sialon、α-Al2O3、Si O2等的混合物。并对高铝粉煤灰合成β-Sialon的反应过程进行了分析。β-Sialon powder was prepared from fly ash and carbon black via carbothermal reduction nitridation in this study. The main factors such as additives of Al2O3 and carbon, heating temperature, soaking time and the flow of N2 were investigated and their effects on the phase of products were also analyzed by XRD and SEM. A nearly pure β-Sialon powder can be obtained when a proper amount of Al2O3 is added, carbon is 23 %, and calcination occurs at 1450℃ for 6 hours at the N2 flow of 2.0 L/min. Some other phases such as AlN, β-SiC, Si3N4, Al6Si2O13, O＇-Sialon, α-Al2O3, SIO2 exist under different preparation conditions. The size of β-Sialon powder is mostly 1- 3μm, and the shape and crystallization degree of prepared β-Sialon are greatly affected by the synthesized conditions.

关 键 词：高铝粉煤灰 Β-SIALON 碳热还原氮化法 

分 类 号：X705[环境科学与工程—环境工程] P579[天文地球—矿物学]