Preparation and Microstructure Characterization of Mullite Coatings Made of Mullitized Natural Andalusite Powders

被引：8

作者：

An, Yulong ^{[1
,2
]}

Liu, Guang ^{[1
,2
]}

Zhao, Xiaoqin ^{[1
]}

Chen, Jianmin ^{[1
]}

Zhou, Huidi ^{[1
]}

Hou, Guoliang ^{[1
,2
]}

机构：

[1] Chinese Acad Sci, Lanzhou Inst Chem Phys, State Key Lab Solid Lubricat, Lanzhou 730000, Peoples R China

[2] Chinese Acad Sci, Grad Sch, Beijing 100049, Peoples R China

来源：

JOURNAL OF THERMAL SPRAY TECHNOLOGY | 2011年 / 20卷 / 03期

基金：

中国国家自然科学基金;

关键词：

andalusite; microstructure characterization; mullite coating; mullitization; plasma spraying; preparation; ENVIRONMENTAL BARRIER COATINGS; SILICA; SPRAY;

D O I：

10.1007/s11666-010-9536-6

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Natural andalusite powders were heated at high temperature in air allowing mullitization. The mullitized powders were spray-dried and then air plasma sprayed to form mullite coatings. Microstructure and phase composition of the plasma-sprayed mullite coatings were investigated by means of scanning electron microscopy and x-ray diffraction. The effect of spraying power on the microstructure and phase composition of the mullite coatings was investigated. It has been found that spraying power has significant effect on the content of amorphous phase in the mullite coatings. At the same time, good adhesion is reached between the mullite coating and the bound coating (NiCrAlY) and between the bound coating and the substrate. The mullite coating deposited at a spraying power of 22.5 kW is free of cracks. The processes reported here are applicable to preparing mullite coatings used in high-temperature environment.

引用

页码：479 / 485

页数：7

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