Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7888260 | Ceramics International | 2018 | 6 Pages |
Abstract
The Al-Al2O3-MgO composite was calcined at 1800 â in flowing nitrogen, using fused corundum, tabular alumina, activated α-Al2O3, high purity magnesia and metal aluminum powder as raw materials and magnesium aluminate sol as binding agent. The calcined sample was characterized and analyzed by XRD, SEM and EDS, and evolution mechanism of MgAlON was studied. Formation mechanism of MgAlON can be described as follows. At elevated temperatures in flowing nitrogen, Al(g)/Al2O(g) diffuses and transfers along pores or gaps in the Al-Al2O3-MgO composite, being nitrided as AlN, and then AlN reacts with Al2O3-rich spinel to form granular MgAlON. In gas-gas reaction system, Al(g)/Al2O(g), N2(g), Mg(g) and O2(g) react to form flake MgAlON.
Keywords
Related Topics
Physical Sciences and Engineering
Materials Science
Ceramics and Composites
Authors
Mingwei Yan, Yong Li, Hongyu Li, Yang Sun, Haiyang Chen, Chenhong Ma, Jialin Sun,