Fabrication and Properties of in-situ Formed Mullite Coating by Laser-Sintering; [激光烧结原位合成莫来石涂层及其性能]

被引：0

作者：

Xiong J. ^{[1
]}

Li X. ^{[1
]}

Feng Z. ^{[1
]}

Hou X. ^{[2
]}

Huang J. ^{[1
]}

机构：

[1] School of Materials Science and Engineering, Nanchang Hangkong University, Nanchang

[2] Tianjin Boya Dadi New Material Technology Ltd., Tianjin

来源：

Kuei Suan Jen Hsueh Pao/Journal of the Chinese Ceramic Society | 2019年 / 47卷 / 05期

关键词：

Coating; In-situsynthesis; Laser sintering; Mullite;

D O I：

10.14062/j.issn.0454-5648.2019.05.13

中图分类号：

学科分类号：

摘要：

A mullite anti-oxidation coating was prepared in-situ on graphite substrate by laser-sintering aluminum and silica powders without any binder to prevent the oxidation of graphite. The phase composition, microstructure, the Vickers hardness and oxidation resistance of the prepared coating were investigated. The results reveal that mullite phase with a small amount of alumina and silica is mainly formed in the coating. A dense and crack free mullite coating is formed on the surface of graphite. Some columnar mullite crystals are embedded in silica glass phase, thus enhancing the adhesion between the coating and the substrate. The Vickers hardness of the coating reaches 910 HV0.5. The mullite coating has the excellent oxidation resistance at a high temperature for a long time. The main reaction mechanism of mullite synthesized by laser-sintering is liquid phase reaction of aluminum and silica. © 2019, Editorial Department of Journal of the Chinese Ceramic Society. All right reserved.

引用

页码：675 / 678

页数：3