| 摘要: |
| 采用球磨造粒法制备Sm2Zr2O7(SZO)和Y2O3部分稳定ZrO2(YSZ)复合粉体，对造粒团聚体的尺寸、形貌及相结构进行了表征。并采用大气等离子制备SZO/YSZ复合涂层，研究等离子喷涂过程对复合粉体相结构和相稳定性的影响。用扫描电子显微镜(SEM)和X射线衍射(XRD) 分析了YSZ/SZO复合粉体和涂层的微观组织和相结构，并利用差示扫描量热法(DSC)研究复合粉体稳定性。结果表明：SZO和YSZ复合团聚粉体表面光滑致密，室温呈混合相结构。在室温~1200 ℃范围内无相变发生，说明YSZ/SZO粉末在该范围内较为稳定。等离子喷涂YSZ/SZO涂层呈典型层状组织结构，涂层成分和组织分布较为均匀，与单一SZO涂层相比，复合陶瓷涂层结合强度得到了提高。但等离子喷涂过程中SZO与YSZ发生离子扩散，粉体稳定性下降，SZO发生有序-无序转变，涂层呈现单一萤石结构。 |
| 关键词: 热障涂层 锆酸钐 复合粉体 等离子喷涂 微观组织 相稳定性 |
| DOI：10.11933/j.issn.1007-9289.20190530002 |
| 分类号:TG174.442 |
| 基金项目:北京市自然科学基金（2131006） |
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| Preparation and Properties of YSZ/Sm2Zr2O7 Composite Powders |
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CHEN Dong1, LIU Yanbo1, WANG Quansheng1, NING Xianjin1, LUAN Xingtao2
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1.National Key Laboratory of Science and Technology on Materials Under Shock and Impact, Beijing Institute of Technology, Beijing 100081, China;2.Institute of Standardization, China Ordnance Industry, Beijing 100089, China
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| Abstract: |
| Sm2Zr2O7 (SZO) and Y2O3 partially stabilized ZrO2 (YSZ) composite powders were prepared by agglomeration granulation after ball milling. The size, morphology and phase structure of granulated aggregates were characterized. The SZO/YSZ composite coating was prepared by atmospheric plasma. The effects of heat treatment and plasma spraying on the phase structure of composite powders and its phase stability were studied. The microstructures and phase structures of YSZ/SZO composite powders and coatings were studied by scanning electron microscopy (SEM) and X-ray diffraction (XRD). The stability of YSZ/SZO composite powders was investigated by differential scanning calorimetry (DSC). The results indicate that spherical agglomerated SZO and YSZ composite powders are relatively smooth and the structure is compact with a mixed phase structure at room temperature. No phase transformation occuring in the range of room temperature to 1200 ℃ reveals that the YSZ/SZO powders have suitability in the service temperature. The YSZ/SZO coating has a typical layered structure, and the composition and structure distribution of the coating are relatively uniform. Compared with the single SZO coating, the bonding strength of the YSZ/SZO coating is significantly improved. During plasma spraying, the stability of the powder decreases due to ions diffuse. The ordered phase in SZO transformed to disordered phase and the composite coating only presents a single fluorite structure. |
| Key words: thermal barrier coating Sm2Zr2O7 composite powder plasma spray microstructure phase stability |
