Effect of Vacuum Annealing Treatment on the Wear Performance of AlCoCrFeNiCu High Entropy Coating Prepared by HVOF Technology

doi:10.3901/JME.2025.10.075

Abstract

Abstract: In order to enhance the wear resistance of key components of coalbed methane(CBM) drilling tools, High velocity oxy-fuel (HVOF) technology was used to prepare AlCoCrFeNiCu high entropy coatings(HEC) on the 35CrMo steel substrate, and the HEC was vacuum annealed at various temperatures (500, 700 and 900 ℃). The microstructure, phase structure and microhardness of the high entropy alloy coating were analyzed by SEM, XRD and microhardness tester. Then friction and wear tests were conducted on the HEC (including dry sliding wear and wet sliding wear in CBM drilling fluid). The results show that an appropriate vacuum annealing process can enhance the uniformity of the HEC structure, as well as improve its hardness and wear resistance. The AlCoCrFeNiCu HEC annealed at 500 ℃ has the highest microhardness (737±33) HV_0.2 and the best wear resistance, which is (5.2±0.3)×10⁻⁵ mm³·N⁻¹·m⁻¹ (dry sliding wear) and (2.4±0.1)×10⁻⁵ mm³·N⁻¹·m⁻¹ (wet sliding wear). The wear mechanism of the AlCoCrFeNiCu HEC under dry sliding wear is mainly abrasive wear, adhesion wear and oxidation wear. Besides, the wear mechanism of the AlCoCrFeNiCu HEC under wet sliding wear is mainly abrasive wear, adhesive wear and corrosion wear.

Key words: AlCoCrFeNiCu, high entropy coating, vacuum annealing, wear

CLC Number:

TH117

ZHOU Yongkuan, KANG Jiajie, MA Guozheng, LIU Yuhe, LI Ruifeng. Effect of Vacuum Annealing Treatment on the Wear Performance of AlCoCrFeNiCu High Entropy Coating Prepared by HVOF Technology[J]. Journal of Mechanical Engineering, 2025, 61(10): 75-89.

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