TiAl合金表面激光重熔Al2O3-13wt%TiO2复合陶瓷涂层组织结构

王东生; 田宗军; 沈理达; 刘志东; 黄因慧

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航空材料学报 ›› 2008, Vol. 28 ›› Issue (6) : 51-56.

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论文

TiAl合金表面激光重熔Al₂O₃-13wt%TiO₂复合陶瓷涂层组织结构

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Microstructure of Laser Remelted Al₂O₃-13wt%TiO₂ Composite Ceramic Coatings on TiAl Alloy Surface

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摘要

采用等离子喷涂和激光重熔复合工艺在TiAl合金表面制备了Al2O3-13wt%TiO2复合陶瓷涂层。为了减少重熔层裂纹等缺陷,采用较低的激光功率和能量密度进行重熔。用扫描电镜(SEM),能谱仪(EDS)和X射线衍射仪(XRD)分析了涂层形貌、微观结构和相组成。结果表明,经过激光重熔处理后,陶瓷涂层颗粒细化,片层状组织得以消失,致密性提高,获得了基本没有裂纹等缺陷的重熔层;激光重熔亚稳相-γAl2O3转变为稳定相-αAl2O3;由于陶瓷材料导热系数较低的影响,激光重熔时无法使整个陶瓷层实现重熔,重熔后的陶瓷涂层形成了晶粒细小的等轴晶重熔区、烧结区以及片层状残余等离子喷涂区。

Abstract

The Al2O3-13wt%TiO2 composite ceramic coatings prepared by plasma spraying on TiAl alloy surface were remelted by laser.To reduce the crack origination,a lower laser power and energy density was used during laser remelting.The morphology,microstructure and phase constitution of coating were investigated using X-ray diffractometry(XRD),scanning electron microscopy(SEM) and energy dispersive spectroscope(EDS),respectively.The results show that the ceramic coating has smaller grains and higher compactness after laser remelting,and the lamellar structure of as-sprayed coating is also eliminated.The remelted coaing is almost without cracks or other defets.The metastable γ-Al2O3 phase in the remelted area transfers into stable α-Al2O3 phase.The ceramic coating cannot be total remelted due to low thermal conductivity of ceramic material.According to the microstructural difference,the ceramic coating can be divided into the remelted zone(fine equiaxed grains),the sintered zone and remained plasma-sprayed zone(lamellar-like structure).

导出引用

王东生, 田宗军, 沈理达, 刘志东, 黄因慧. TiAl合金表面激光重熔Al₂O₃-13wt%TiO₂复合陶瓷涂层组织结构[J]. 航空材料学报, 2008, 28(6): 51-56

WANG Dong-sheng, TIAN Zong-jun, SHEN Li-da, LIU Zhi-dong, HUANG Yin-hui. Microstructure of Laser Remelted Al₂O₃-13wt%TiO₂ Composite Ceramic Coatings on TiAl Alloy Surface[J]. Journal of Aeronautical Materials, 2008, 28(6): 51-56

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