| AN Yu-long,CHEN Jian-min,ZHOU Hui-di,WEI Jia-jun.Preparation and Microstructure of Mullite/SiO2Composite Coating[J],39(5):1-3,76 |
| Preparation and Microstructure of Mullite/SiO2Composite Coating |
| Received:June 23, 2010 Revised:October 10, 2010 |
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| DOI： |
| KeyWord:andalusite mullite spray-dry atmosphere plasma spray |
| Author | Institution |
| AN Yu-long |
1.State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics,Chinese Academy of Sciences, Lanzhou , China;2.Graduate School of Chinese Academy of Science, Beijing , China |
| CHEN Jian-min |
State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics,Chinese Academy of Sciences, Lanzhou , China |
| ZHOU Hui-di |
State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics,Chinese Academy of Sciences, Lanzhou , China |
| WEI Jia-jun |
Gansu Zixin Mining Industry and Coal Chemistry Industry Company Ltd., Lanzhou , China |
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| Abstract: |
| Natural andalusite powders as raw material were heated at high temperature in air allowing mullitization. The resultant mullitized powder was spray-dried and heat treated to attain spherical mullite/SiO2composite powder. The mullite/SiO2composite powder was then plasma sprayed onto stainless steel(1Cr18Ni9Ti)to form coatings. The microstructural, microhardness and phase structure of as-sprayed mullite coatings were analysed. Results show that the mullitized andalusite powder consists of mullite and a small amount of free SiO2. The apparent density of spray-dried powders is improved after thermal treatment at 1 000℃ .The as-sprayed coating has fine microstructure and higher microhardness. The phase component of as-sprayed coating consistes of crystalline mullite, quartz and amorphous glass phase. |
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