超音速电弧与普通电弧喷涂FeCrNiB涂层的耐磨损性能

Wear Resistance of Coatings Prepared by Supersonic Arc Spraying and Ordinary Arc Spraying

为了提高电弧喷涂涂层的结合强度及耐磨损性能,采用超音速电弧喷涂技术和普通电弧喷涂技术在Q235钢表面分别制备了Fe17Cr5NiB涂层,通过扫描电镜(SEM)、X射线衍射仪(XRD)、显微硬度计、摩擦磨损试验机等手段对比分析了2种涂层的微观结构及性能。结果表明:超音速电弧涂层具有更加致密的结构,其平均孔隙率为0.95%,远低于普通电弧涂层;超音速电弧涂层与基体呈紧密结合,其结合强度为60 MPa,而普通电弧涂层与基体之间呈明显的分层状态,其结合强度仅为28 MPa;超音速电弧涂层具有良好的非晶态结构及致密性,使其具有远高于普通电弧涂层的硬度以及耐磨损性能,显微硬度高出普通电弧涂层32.27%,耐磨损性能是普通电弧涂层的2倍以上(是基体的14倍以上)。

In order to improve the bonding strength and wear resistance of arc spraying coatings, Fel7CrSNiB coatings were prepared on Q235 steel by supersonic arc spraying and ordinary arc spraying. Comparison analysis of the microstructure and properties of two kinds of coatings by scanning electron microscopy （SEM）, X-ray diffractometer （XRD）, hardness measurement, wear testing machine, etc was carried out. Re- suits showed that supersonic arc coating had a more compact structure and its porosity was far lower than that of the ordinary arc coatings. The supersonic arc coatings and the matrix were combined closely with the bonding strength of 60 MPa, while there was obviously delaminating be- tween ordinary arc coatings and matrix with the bonding strength of only 28 MPa. Besides, the supersonic arc coatings had good amorphous structure and compactness. Therefore, the hardness and wear resistance of supersonic arc coatings were better than those of the ordinary arc coatings： the micro-hardness was 32.27% higher than that of the ordinary arc coatings, and the wear resistance was 2 times higher than that of the ordinary arc coatings（ 14 times higher than that of the matrix）.