| Microstructure and thermal cycle resistance of plasma sprayed mullite coatings made from secondary mullitized natural andalusite powder | |
| Department | 固体润滑国家重点实验室 ; 先进润滑与防护材料研究发展中心 |
An YL(安宇龙) ; Chen JM(陈建敏); Zhou HD(周惠娣); Liu G(刘光)
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| 2010 | |
| Source Publication | Surface and Coatings Technology
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| ISSN | 0257-8972 |
| Volume | 205Pages:1897-1903 |
| Abstract | Natural andalusite powder was calcinated at a high temperature in air to realize secondary mullitization. Theresultant secondary mullitized powder was spray-dried and heat-treated to improve sprayable capabilityThe heat-treated spherical powder was then plasma sprayed onto Ni-based high-temperature alloy(Hastelloy C-276) to form mullite coatings. The chemical composition and phase structure of the as-sprayedand thermally cycled mullite coatings were determined by means of energy dispersive X-ray fluorescence(ED-XRF) and X-ray diffraction. The microstructure of the as-sprayed coatings was analyzed by using ascanning electron microscope; and their porosity, microhardness and bonding strength were measuredMoreover, the phase transition temperature and enthalpy of the coatings were determined by means ofdifferential scanning calorimetry; and their thermal shock resistance was evaluated as well. Results showthat the spray-dried and heat-treated powder consists of mullite and a small amount of Al2O3; while the as-sprayed mullite coatings are composed of crystalline mullite as the major phase and a small amount ofamorphous glass phase. During thermal cycle test, the amorphous glass phase is partially transformed tocrystalline mullite, finally leading to failure of the coatings.Whether before or after thermal cycle, the mullitecoatings experience phase transition around 980 °C, and the enthalpy of crystallization is determined tobe −141.9×10−3J/kg and −95.48×10−3J/kg, respectively. The as-sprayed mullite coatings have a porosityof about 6.0±0.2% and possess good thermal cycle resistance, showing promising prospect in a high-temperature application. |
| Keyword | Andalusite Mullitization Plasma Spraying Mullite Coating Thermal Cycle Resistance |
| Subject Area | 材料科学与物理化学 |
| Funding Organization | the National Natural Science Foundation of China (grant no. 50421502);the Ministry of Science and Technology of China (project of “973” Plan; grant no. 2007CB607601) |
| Indexed By | SCI |
| Language | 英语 |
| Funding Project | 磨损和表面工程组 |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://ir.licp.cn/handle/362003/1059 |
| Collection | 固体润滑国家重点实验室（LSL） 中国科学院材料磨损与防护重点实验室/先进润滑与防护材料研究发展中心 |
| Corresponding Author | Chen JM(陈建敏) |
| Recommended Citation GB/T 7714 | An YL,Chen JM,Zhou HD,et al. Microstructure and thermal cycle resistance of plasma sprayed mullite coatings made from secondary mullitized natural andalusite powder[J]. Surface and Coatings Technology,2010,205:1897-1903. |
| APA | 安宇龙,陈建敏,周惠娣,&刘光.(2010).Microstructure and thermal cycle resistance of plasma sprayed mullite coatings made from secondary mullitized natural andalusite powder.Surface and Coatings Technology,205,1897-1903. |
| MLA | 安宇龙,et al."Microstructure and thermal cycle resistance of plasma sprayed mullite coatings made from secondary mullitized natural andalusite powder".Surface and Coatings Technology 205(2010):1897-1903. |
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