Microstructure and Wear Behaviors of Plasma-Sprayed MoAlB Ceramic Coating

Coatings

Shengnan Sun¹  Yun Wang¹  Zhenying Xu¹  Fuzhu Li¹  Ruitao Li¹  Yong Xu²  Lihui Tian³ 

[1] Department School of Mechanical Engineering, Jiangsu University, Zhenjiang 212013, China;Department of Mechanic Engineering, Wenzhou Polytechnic, Wenzhou 325000, China;National Demonstration Center for Experimental Materials Science and Engineering Education, Jiangsu University of Science and Technology, Zhenjiang 212008, China;

关键词: MoAlB;    plasma-sprayed coating;    microstructure;    tribological property;   

DOI  :  10.3390/coatings11040474

来源: DOAJ

【 摘 要 】

MoAlB ceramic coatings were prepared on a 316 steel surface by atmospheric plasma spraying with different arc power levels. The phase composition, microstructure and wear resistance of coatings against GCr15 and Si₃N₄ counterparts were studied. The MoAlB ceramic decomposed and was oxidized to form MoB and Al₂O₃ during plasma spraying. With the increase of the arc power, MoAlB experienced more decomposition, but the coatings became denser. When the arc power increased from 30 to 36 kW, the wear rates of coatings against GCr15 and Si₃N₄ balls reduced by 91% and 78%, respectively. The characterization of wear tracks shows that when against GCr15 counterparts, the main wear mechanisms are abrasive and adhesive wear, and when against Si₃N₄ counterparts, fatigue and abrasive wear are dominant. The refinement of wear resistance by increasing arc power can be attributed to the improvement of density and adhesive strength among splats.

【 授权许可】

Unknown