超音速等离子喷涂WC-17Co纳米涂层的性能研究

Study on Properties of Supersonic Plasma Sprayed WC-17Co nano-coating

摘要:

采用超音速等离子喷涂在0Cr13Ni5Mo不锈钢表面制备了纳米和微米WC-Co涂层，并对比了两种涂层的孔隙率、结合强度、硬度和耐磨性。结果表明，纳米涂层的致密性和结合强度均高于微米涂层，其孔隙率仅为0.56%，结合强度大于69.2 MPa；纳米涂层和微米涂层的硬度是基体的3.9和3.8倍，硬度值从涂层的表面到底部逐渐增加；基体磨损为磨粒磨损 粘着磨损 层状剥落，两种涂层磨损均为磨粒磨损。纳米涂层的孔隙率低、硬度高、表面抗压性强使其表现出更优的耐磨性。

Abstract:

The nano and micro WC-17Co coatings were fabricated on the 0Cr13Ni5Mo stainless steel by supersonic plasma spraying method. The porosity, adhesive strength, hardness and wear resistance of both coatings were compared. The results indicate that the porosity and adhesive strength of nano-coating (i.e., 0.56% and over 69.2 MPa) are higher than those of micro-coating. The hardness of nano-coating and micro-coating are 3.9 and 3.8 times more than that of matrix, respectively. The hardness of both coating will gradually increase from its top to bottom. The wear mechanisms of matrix were adhesive wear, abrasive wear and delamination, while the coatings only suffered adhesive wear. The lower porosity, higer hardness and stonger compressive resistance of nano-coating result in its excellent wear resistance.