| XU Xin-jie,HE Yi,MA Dong-lin,LIU Yuan-zhong.Study on the Structure and Thermal Oxidization Properties of Plasma-sprayed Al2O3-13%TiO2Composite Ceramic Coatings[J],39(1):15-19 |
| Study on the Structure and Thermal Oxidization Properties of Plasma-sprayed Al2O3-13%TiO2Composite Ceramic Coatings |
| Received:June 26, 2009 Revised:February 10, 2010 |
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| DOI： |
| KeyWord:Plasma spray Al2O3-13%TiO2 Thermal oxidization Structure Properties |
| Author | Institution |
| XU Xin-jie |
Xihua University, Chengdu , China |
| HE Yi |
Xihua University, Chengdu , China |
| MA Dong-lin |
Xihua University, Chengdu , China |
| LIU Yuan-zhong |
Chengdu Steel& Vanadium Co., Ltd of Pangang Group, Chengdu , China |
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| Abstract: |
| The conventional and nano-structured Al2O3-13%TiO2composite coatings were prepared on the substrate Q235 steel by atmosphere plasma spraying. The thermal oxidization experiment was investigated, the phase composition before and after spraying was analyzed by XRD and the distribution of components was studied by EDS. All above were done in order to find out the differences of microstructure and thermal oxidization properties and the failure mechanism of those two kinds of as-sprayed coatings. The results show thatα-Al2O3in the two kinds of coatings decreases while theγ-Al2O3increases after spraying. Rutile-TiO2transforms to brookite-TiO2and the innerstress of coating was increased so as to aggravate the expansion of cracking. The pores are small but dense in the conventional coating while bigger but loose in the nano-structured coating. The pores in the nano-structured coating exist almost inside the partially melted region. The pores generated during spraying and the cracks generated during the course of thermal oxidization because of thermal stress are the direct reasons why coatings fail. |
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