等离子喷涂Al_2O_(3p)/NiCrBSi涂层组织与性能

Microstructures and properties of plasma sprayed Al_2O_(3p)/NiCrBSi composite coating

为了研究粉末结构对复合材料涂层组织与性能的影响规律,采用双路送粉方法、高能球磨团聚粉末及包覆混合粉末等离子喷涂制备Al2O3p/NiCrBSi复合材料涂层.利用激光共聚焦扫描显微镜(LCSM)、扫描电子显微镜(SEM)、场发射扫描电子显微镜(FESEM)、x-射线衍射仪(XRD)及冲蚀磨损试验机等研究了涂层的微观组织和抗冲蚀磨损性能.结果表明,复合材料涂层主要由α-Al2O3、γ-Al2O3、γ-Ni、Ni3B、CrB、Cr2B、M7C3和M23C6相组成,Al2O3增强体颗粒分布于基体层片间或层片内.粉末结构对涂层的组织与性能具有明显的影响,采用包覆混合粉末制备的Al2O3p/NiCrBSi复合材料涂层结构致密,具有更高的抗冲蚀磨损性能.

In order to evaluate the effect of power structure on both microstructure and property of composite coating,the Al2O3p /NiCrBSi composite coating was fabricated by plasma spraying technology with double line powder feed method, high energy ball milling agglomerated powder and coated powder. The microstructures and erosion resistance of the Al2O3p /NiCrBSi coating were investigated using LCSM,SEM, FESEM XRD and erosion test machine. The results show that the microstructure of the composite coating consists mainly of α-Al2O3,γ-Al2O3,γ-Ni,Ni3B,CrB,Cr2B,M7C3 and M23 C6 phases. The Al2O3 reinforcing particles distribute between matrix lamellas or inside matrix. The powder structure has an obvious effect on both microstructure and erosion resistance of the coating. The Al2O3p /NiCrBSi composite coating fabricated with coated powder exhibits the compact structure and higher erosion resistance.