高速钢表面硬质合金覆层的组织及性能

Microstructure and Properties of Cemented Carbide Coating on Surface of High Speed Steel

通过热喷涂-真空粉末烧结的方法在高速钢表面制备硬质合金覆层，分析了硬质合金覆层组织和界面结构的特点、测试了硬质合金覆层的结合强度、硬度和耐磨性。结果表明，热喷涂后经过1200℃烧结，获得1—3mm厚度的硬质合金覆层，结合强度达到450MPa，硬度达到85HRA，具有较高的耐磨性能。

The microstructure and properties of cemented carbide on the interface of high speed steel by thermal spraying-vacuum powder sintering are investigated. The interface characteristics and bonding strength between coating and high-speed steel substrate, micro-hardness at varied temperatures and wear resistance of high speed steel-cemented carbide composites are analyzed. The results indicate that the cemented carbide coating with 1~3 mm in thickness and 450 MPa in bonding strength and 85 HRA in micro-hardness can be prepared after thermal spraying by vacuum powder sintering at 1 200 ℃, exhibiting higher wear resistance.