硅酸盐学报2011，Vol.39Issue(3)：424-429,457,7.
氮气气氛下铁铝尖晶石的合成
Synthesis of Hercynites Under N2 Atmosphere
摘要
Abstract
The synthesis of hereynites by sintering method needs to control a suitable atmosphere, and make sure of ferrous oxide (FeO) at the temperature and O2 partial pressures which it can stably exist. By analyzing the phase equilibria about the system Fe2O3-Al2O3 in different O2 partial pressure and the isothermal section of the system FeO-Fe2O3-Al2O3 at 1 500 ℃, the results show that the lower O2 partial pressure is beneficial for synthesizing hercynite. The solid solubility of Fe3O4 and FeAl2O4 reduced rapidly with the decreasing of O2 partial pressure and increasing of the content of hercynite. Thermodynamics calculation indicates that FeO can stably exist at the temperature between 1 473 ℃ and 2 160 ℃ under a high purity N2 atmosphere which the O2 partial pressure is 0.5 Pa, and hercynites can be synthesized at this condition. The test proves that if the Fe2O3 powders and Al2O3 powders are used as raw materials, it need add a definite mass of carbon powders to consume the oxygen decomposed by iron oxide, and all ferrous oxides change to hercynites when the temperature is higher than 1 500 ℃. Such a high sintering temperature makes the reaction limited in the laboratory.关键词
铁铝尖晶石/氧化亚铁/氧分压/相图/热力学Key words
hereynites/ ferrous oxide/ oxygen partial pressure/ phase equilibria/ thermodynamics分类
化学化工引用本文复制引用
马淑龙,李勇,孙加林,王志发..氮气气氛下铁铝尖晶石的合成[J].硅酸盐学报,2011,39(3):424-429,457,7.基金项目
北京通达耐火技术股份有限公司资助. （）
