摘要
以用后镁碳砖和用后滑板砖为主要原料,采用碳热还原氮化合成MgAlON/β-SiAlON复相材料,研究了复相材料的合成配比、氮化温度与相组成的关系,复相材料相组成与理化性能的关系,并采用XRD、SEM和EDS等手段对合成产物进行分析。结果表明:(1)热力学计算表明高温下MgAlON与β-SiAlON存在热力学稳定共存区域;(2)当氮化温度不同时合成相组成变化较大,1923K时氮化合成了MgAlON/β-SiAlON复相材料;(3)β-SiAlON含量较高试样的抗折强度较好,可达到45MPa。
MgAlON/β-SiA1ON composites have been one-step synthesized by carbonthermal reduction-nitridation method from wasted magnesite carbon brick and wasted slide gate at 1 923 K. The phase compositions, nitridation temperature and physics properties of MgAION/β-SiAlON composities, have been detailed investigated and discussed. The phase characterization and microstmcture also have been analyzed by XRD, SEM, and EDS. Based on thermodynamic analysis, MgA1ON and 13-SiAlON is being similar phase stability diagram and synthetical parameter at 1 873 K. Different phase composition are generated along with the increased of temperature from 1 823 K to 1 923 K. The composites with high content of β-SiAlON showed higher strength of 45 MPa.
出处
《科学技术与工程》
2009年第16期4624-4629,共6页
Science Technology and Engineering
基金
国家自然科学基金(50874013)资助
首钢科技开发资金(2006科12-2)