硅酸盐学报2016，Vol.44Issue(9)：1341-1346,6.DOI:10.14062/j.issn.0454-5648.2016.09.14
氮化烧成铝-方镁石-刚玉复合材料的显微结构和反应机理
Microstructure and Reaction Mechanism of Al-MgO-Al2O3 Composites After Nitriding Sintering
马佳佳 1李勇 1岳丹丹 1洪炀 1仝尚好 1蒋朋 1薛文东1
作者信息
- 1. 北京科技大学材料科学与工程学院，北京 100083
- 折叠
摘要
Abstract
The Al–MgO–Al2O3 composite samples were prepared with alumina (fused corundum and sintered alumina), high purity magnesia and Al powder of 0, 4%(in mass fraction), 6%and 10%, respectively, sintered at 1 600℃in a carbon tube furnace under nitrogen atmosphere. The results show that the main phases are corundum and magnesium aluminum spinel solid solution, while the matrix is a reinforced composite structure composing of spinel solid solution, AlN, AlON and MgAlON phases. The amount of AlN, AlON and MgAlON contents increases with increasing the content of Al powder. The unreacted Al powder exists. The mechanism of aluminum nitride was proposed as follows:Al reacts with nitrogen to form AlN;AlN and Al2O3 solid solution react to form AlON phase; MgO or a new form of spinel and AlON phase solid solution react to form MgAlON. The nitriding reaction model of Al powder was also established, showing the cyclic structure. The inner layer of samples is the unreacted Al powder and the micro-pores formed after reaction. The middle layer of samples is the composite structure of AlN and AlON. The outer layer of samples is the composite structure of AlON and MgAlON. Part of the fused alumina reacts to form the cyclic shaped magnesia-alumina spinel.关键词
铝粉/镁阿隆/阿隆/氮化铝/氮化反应Key words
aluminum powder/magnesium aron/aron/aluminum nitride/nitriding reaction分类
化学工程引用本文复制引用
马佳佳,李勇,岳丹丹,洪炀,仝尚好,蒋朋,薛文东..氮化烧成铝-方镁石-刚玉复合材料的显微结构和反应机理[J].硅酸盐学报,2016,44(9):1341-1346,6.
