Effect of the Structure of TiB2–(Fe–Mo) Plasma Coatings on Mechanical and Tribotechnical Properties

• Published in: Powder metallurgy and metal ceramics Vol. 56; no. 1-2; pp. 60 - 69
• Main Authors: Storozhenko, M. S., Umanskii, A. P., Terentiev, A. E., Zakiev, I. M.
• Format: Journal Article
• Language: English
• Published: New York Springer US 01.05.2017
• Subjects: Ceramics; Characterization and Evaluation of Materials; Chemistry and Materials Science; Composites; Glass; Materials Science; Metallic Materials; Natural Materials; Protective and Functional Powder Coatings; wearresistance; titanium diboride; coating; plasma spraying; structure; iron-molybdenum alloy
• ISSN: 1068-1302; 1573-9066
• DOI: 10.1007/s11106-017-9872-x

The structure, mechanical properties, and wear-resistance of TiB2–(Fe–Mo) plasma coatings are investigated. Composite powders in the TiB 2 –(Fe–Mo) system with 20, 40, 60, and 80 wt.% of the Fe–13 wt.% Mo alloy were produced by vacuum sintering with subsequent grinding. The developed powders are conglomerates that contain both refractory and metallic phases. During plasma spraying of developed coatings, a coating with heterophase structure, which consists of Fe-based metal alloy and titanium diboride grains, is formed. The effect of the microstructure of plasmasprayed coatings on the wear-resistance under abrasive wear and dry sliding friction conditions is studied. The scratch hardness testing revealed an insufficient strength of TiB 2 –20 wt.% (Fe–13 wt.% Mo) coatings and their poor adhesion to the coating base, resulting in the extremely gross wear, when friction. It is found out that, due to the optimal ratio of refractory and metallic phases, the TiB 2 –40 wt.% (Fe–13 wt.% Mo) coating possesses high wear-resistance under abrasive wear and dry sliding friction conditions.