摘要
研究了氢氧化铝（AION）尖晶石粉在1330～1730℃的石墨压力炉中，N2和N2＋CO气氛（压力0．2和5MPa）条件下的热稳定性以及在900℃，1200℃的大气和氧气中的氧化行为．在石墨护中保温6h后，A10N的成份变化很大，表明通常在低于1630℃时，AION是不稳定的．在大气中，低于600℃时AION是稳定的．在1200℃时，只需几个小时即可完全氧化．而在中间温度的大气和氧气中，成份-时间曲线是S形的，表明氧化是从生核开始的。
The thermal stability of aluminium oxynitride (AION) spinel powder has been inves-tigated by heat-treatment of small samples in a gas autoclave with a graphite furnace at different pressures (0.2 and 5 MPa) and temperatures (1330～1730℃) in N2 and N2+10％ CO. Oxidation Stud-ies of AION powder were pedermed in an alumina tube furnace by heat-treatment of samples in airor oxygen at constant temperatures between 900 and 1200℃. In the graphite furnace. significantcompositional shifts were obtained after 6h annealing, showing that AION is thermodynamically un-Stable below ～1630℃ under the prevailing conditions. In air, AION powder is stable up to 900℃,but at 1200℃ full oxidation was accomplished in a few hours. At intermediate temperatures in air and oxygen, the composition vs time curves have a sigmoid shape, suggesting that the oxidation process is preceded by a nucIeation stage, which also manifested itself in appreciable u induction periods'.
出处
《材料研究学报》
EI
CAS
CSCD
北大核心
1998年第5期497-506,共10页
Chinese Journal of Materials Research
