摘要
将金属陶瓷粉末与具有不同熔点的自熔合金粉末混合喷涂于金属基材表面，形成低熔点相的固液相变点温度从基材界面向涂层表面逐步升高的梯度涂层，研究了在１０００℃烧结后烧结层的显微组织结构和力学性能．结果表明，在烧结时出现液相的区域内喷涂层所固有的层状结构消失，在界面上有大约２０μｍ宽的扩散区并呈冶金结合，在表层存在明显的固－液相分界线，在显微组织中氧化物有球化趋势．梯度液相烧结可使涂层稳定成型所需的最佳控制参数区间变大，涂层的力学性能满足使用要求．
The mixtures of cermet powder and self-flux alloys powder with different melting- points are sprayed on the surface of substrate to form a gradient coating, in which the solid-liquid phase transformation temperature of low melting-points phase goes higher and higher from the interface to the surface of coating. Microstructure and mechanical properties of sintered layer after sintering at 1000 ℃ are studied, results showed that original layered microstructure of thermal spray coating in the region where the liquid phase appears during sintering disappears. There is about 20μm diffusion region with metallurgical binding on the interface and a clear solid-liquid phase boundary near the surface of coating, the oxide in microstructure tend to assembling. The gradient liquid phase sintering can enlarge the range of the best control parameters, which is necessary for stable coating, and can get good mechanical properties of sintering coating for use.
出处
《材料研究学报》
EI
CAS
CSCD
北大核心
2001年第4期479-483,共5页
Chinese Journal of Materials Research
基金
湖南省自然科学基金资助 98-JJY2028.
