工艺参数对爆炸喷涂WC-Co涂层性能均匀性的影响

INFLUENCE OF PROCESS PARAMETERS ON THE PERFORMANCE UNIFORMITY OF DETONATION GUN SPRAYED WC-Co COATINGS

采用正交实验,分别研究了氧燃率、喷涂距离对爆炸喷涂WC-Co涂层性能的影响.通过工艺优化,获得了结构均匀致密、硬度高、弹性模量大、耐磨性能好的WC-Co涂层.利用XRD和SEM分析涂层的物相组成、观察其微观结构,经截面与表面力学性能和磨损性能对比,优化后的涂层表现出近似各向同性特征.分析指出涂层均匀的微观结构及低孔隙率是导致其近似各向同性特征的主要原因.

Based on the orthogonal experiment, the effects of oxygen-fuel ratio and spraying distance on physical and mechanical properties of D-gun sprayed WC-Co coatings were investigated. An ideal coating with the uniform dense microstructures, high hardness and elastic modulus, and excellent wear resistance was obtained by technology optimization. The phase identifications and microstructure observation of the optimized WC-Co coating were conducted by XRD and SEM, respectively. The coating showed near-isotropic behaviors, which has been verified by the comparisons of mechanical and wear properties between cross section and surface. The mechanisms how the spraying parameters affected near-isotropic characters of the D-gun sprayed WC-Co coating were analyzed and discussed.