镍基喷焊层的抗气蚀性能研究

用火焰喷涂法在低碳不锈钢表面制备镍基合金涂层.借助光学显微镜、X射线衍射仪、显微硬度计、磁致伸缩气蚀仪等设备研究涂层的组织、结构和性 能，并利用扫描电子显微镜对气蚀形貌进行了跟踪观察.结果表明：Ni60喷焊层组织较细，显微硬度远远高于Ni25喷焊层，Ni60喷焊层抗气蚀性能和Ni25喷焊层相比有明显提高.

CAVITATION EROSION RESISTANCE OF SPRAY WELDING NICKEL-BASED COATINGS

Ni-based alloy coatings were made by spray welding on surface of the mild steel(1Cr18Ni9Ti).The microstructure and performance of the coatings were investigated by optical microscope,X-ray diffraction,Vickers hardness,scanning electron microscope(SEM) and vibratory cavitation apparatus.The results show that the Ni60 coating has much higher hardness and finer structure than Ni25 coating and 1Cr18Ni9Ti.In addition,the vibratory cavitation results show that the mass loss increases with increasing test time.These results indicate that the cavitation erosion resistance of Ni60 coating is much better than that of the Ni25 coating,due to higher hardness and finer structure.Furthermore,the cavitation erosion mechanisms were studied also in the end of this paper.The results showed that higher hardness and finer structure can increase the vibratory cavitation resistance of coatings.