| 激光表面重熔对ZrO_2-8wt%Y_2O_3热障涂层组织与抗热震性能的影响 |
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| 引用本文： | 王超,宋仁国.激光表面重熔对ZrO_2-8wt%Y_2O_3热障涂层组织与抗热震性能的影响[J].材料热处理学报,2011,32(5). |
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| 作者姓名： | 王超 宋仁国 |
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| 作者单位： | 常州大学先进金属材料常州市重点实验室,江苏,常州,213164;浙江工业大学特种装备制造与先进加工技术教育部重点实验室,浙江,杭州,310014 |
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| 基金项目： | 浙江省公益技术应用研究项目(2010C31G2020127) |
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| 摘 要： | 采用等离子喷涂设备在H13热作模具钢表面制备氧化钇部分稳定的氧化锆(ZrO2-8 wt%Y2O3)热障涂层,并用CO2横流激光器对热障涂层进行表面重熔处理,并采用X射线衍射仪(XRD)、扫描电子显微镜(SEM)、热震试验等手段研究激光重熔前后热障涂层的微观结构及其抗热震性能的变化。结果表明,重熔前后涂层均由四方结构钇锆氧化物和立方相的氧化锆组成,重熔后涂层结晶度增加,晶粒有长大现象。激光重熔后涂层产生明显分层,表层组织孔隙和裂纹明显减少,裂纹呈网状且沿晶界分布,重熔涂层内部仍保持等离子喷涂典型结构。激光重熔后涂层孔隙率降低了67%,涂层的抗热震性能也显著提高。
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| 关 键 词： | 等离子喷涂 激光表面重熔 热障涂层 组织 抗热震性能 |
Effect of laser surface remelting on microstructure and thermal shock resistance of ZrO_2-8 wt%Y_2O_3 coatings |
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| WANG Chao,SONG Ren-guo.Effect of laser surface remelting on microstructure and thermal shock resistance of ZrO_2-8 wt%Y_2O_3 coatings[J].Transactions of Materials and Heat Treatment,2011,32(5). |
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| Authors: | WANG Chao SONG Ren-guo |
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| Affiliation: | WANG Chao1,2,SONG Ren-guo1,2(1.Key Laboratory of Advanced Metal Meterials of Changzhou City,Changzhou University,Changzhou 213164,China,2.Key Laboratory of Special Purpose Equipment and Advanced Manufactruing Technology,Ministry of Education,Zhejiang University of Technology,Hangzhou 310014,China) |
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| Abstract: | Yttrium stabilized zirconia(YSZ) thermal barrier coatings(TBCs) were fabricated by plasma spraying on the surface of H13 hot die steel and then were remelted by a transverse flow CO2 laser.The microstructure,phases and thermal shock resistance of the as-sprayed and laser remelted coatings were investigated by means of X-ray diffraction(XRD),scanning electron microscopy(SEM) and thermal shock tests.The results show that the coatings before and after laser surface remelting both consist of tetragonal yttrium ... |
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| Keywords: | plasma spray laser surface remelting thermal barrier coatings microstructure thermal shock resistance |
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