电热爆炸喷涂WC/Co涂层组织和性能研究

Microstructure and Properties of Electro-thermal Explosion Sprayed WC/Co Coating

利用电热爆炸喷涂技术,在45钢表面制备了WC/Co耐磨涂层,使用SEM和XRD分析了涂层的组织与相结构,使用显微硬度计和纳米压痕仪测试了涂层的硬度和弹性模量。结果发现,电热爆炸喷涂WC/Co涂层致密,无明显的层状结构;涂层的显微硬度最高达到了2836HV0.1,平均为1704HV0.1;纳米压痕仪测得涂层的弹性模量为346.8 GPa;涂层的相组成主要为WC和W2C;在涂层与基体的结合区,出现柱状晶,证明涂层与基体主要是冶金结合。

The WC/Co coating was prepared on substrate 45 steel with electro-thermal explosion spraying. Microstructure and phase structure of the coating were investigated by SEM, X-ray diffraction, etc. The hardness and elastic modulus were estimated by microhardness meter and nano-indentation instrument respectively. The results show that the WC/Co coating is characterized by compact construction. The average hardness of the coating reachs to 1704HV0. 1 with the highest value of 2836HV0.1. The main phases of the coating are WC and W2C. Columnar crystals appear in the bonded zone between the coating and the substrate and it shows that the bonding between the coating and the substrate is metal lurgical one.