Microstructure and thermal cycle resistance of plasma sprayed mullite coatings made from secondary mullitized natural andalusite powder
文献类型：期刊论文
| 作者 | An YL(安宇龙) ; Chen JM(陈建敏); Zhou HD(周惠娣); Chen JM(陈建敏)
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| 刊名 | Surface and Coatings Technology
 |
| 出版日期 | 2010 |
| 卷号 | 205页码:1897-1903 |
| 关键词 | Andalusite Mullitization Plasma spraying Mullite coating Thermal cycle resistance |
| ISSN号 | 0257-8972 |
| 通讯作者 | 陈建敏 |
| 中文摘要 | 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. |
| 学科主题 | 材料科学与物理化学 |
| 收录类别 | SCI |
| 资助信息 | 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) |
| 语种 | 英语 |
| WOS记录号 | WOS:000286343100016 |
| 公开日期 | 2012-09-28 |
| 源URL | [http://210.77.64.217/handle/362003/1059]  |
| 专题 | 兰州化学物理研究所_固体润滑国家重点实验室 兰州化学物理研究所_先进润滑与防护材料研究发展中心 |
| 通讯作者 | Chen JM(陈建敏); Chen JM(陈建敏) |
| 推荐引用方式 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,&陈建敏.(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. |
入库方式： OAI收割
来源：兰州化学物理研究所
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