Effect of Gas Propellant Temperature on the Microstructure, Friction, and Wear Resistance of High-Pressure Cold Sprayed Zr702 Coatings on Al6061 Alloy

Coatings

Manoranjan Misra¹  Pankaj Kumar¹  Pradeep L. Menezes²  Ashish K. Kasar²  Arpith Siddaiah²  Alessandro M. Ralls²  Mohammadreza Daroonparvar²  Charles M. Kay³ 

[1] Department of Materials and Chemical Engineering, University of Nevada Reno, Reno, NV 89557, USA;Department of Mechanical Engineering, University of Nevada Reno, Reno, NV 89557, USA;Research and Development Department, ABS Industries Inc., Barberton, OH 44203, USA;

关键词: Zr702;    cold spray;    wear;    surface modification;    surface coatings;   

DOI  :  10.3390/coatings12020263

来源: DOAJ

【 摘 要 】

For the first time, Zr702 coatings were deposited onto an Al6061 alloy using a high-pressure cold spray (HPCS) system. In this work, five different N₂ process gas temperatures between 700 and 1100 °C were employed to understand the formation of cold sprayed (CS) Zr coatings and their feasibility for enhanced wear resistance. Results indicated that the N₂ processing gas temperature of about 1100 °C enabled a higher degree of particle thermal softening, which created a dense, robust, oxide- and defect-free Zr coating. Across all CS Zr coatings, there was a refinement of crystallinity, which was attributed to the severe localized plastic deformation of the powder particles. The enhanced thermal boost up zone at the inter-particle boundaries and decreased recoverable elastic strain were accountable for the inter-particle bonding of the coatings at higher process gas temperatures. The flattening ratio (ε) increased as a function of temperature, implying that there was a greater degree of plastic deformation at higher N₂ gas temperatures. The microhardness readings and wear volume of the coatings were also improved as a function of process gas temperature. In this work, the wear of the Al6061 alloy substrate was mainly plowing-based, whereas the Zr CS substrates demonstrated a gradual change of abrasive to adhesive wear. From our findings, the preparation of CS Zr coatings was a feasible method of enhancing the wear resistance of Al-based alloys.

【 授权许可】

Unknown