Wear Behavior of Coatings and Liners for a Certain Type of Helicopter Sliding Bearings

WU Yunzhang; WANG Qianxu; SHI Jinda; LI Jian; REN Yulou; SHEN Jun; GAO Fu

doi:10.7643/ issn.1672-9242.2025.12.004

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Equipment Environmental Engineering ›› 2025, Vol. 22 ›› Issue (12) : 24-30. DOI: 10.7643/ issn.1672-9242.2025.12.004

Aviation and Aerospace Equipment

Wear Behavior of Coatings and Liners for a Certain Type of Helicopter Sliding Bearings

WU Yunzhang, WANG Qianxu, SHI Jinda, LI Jian, REN Yulou, SHEN Jun, GAO Fu

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Abstract

The work aims to study the wear performance and wear mechanism of the inner ring G95Cr18 (with liner) and outer ring 05Cr17Ni4Cu4Nb (with coating) for a certain type of helicopter sliding bearings during friction, establish a friction and wear model, and quantitatively evaluate the wear resistance of helicopter sliding bearings. Different specimens with G95Cr18 as the matrix material for the inner ring with coatings (respectively coated with Cr and Al₂O₃) and the corresponding disc end face liners (respectively equipped with FSZ-Z01 liner and 7623-type liner) were prepared for friction and wear tests under line contact and surface contact conditions. The elastic modulus of the inner and outer ring materials was measured with an electronic universal material testing machine and vernier caliper. The thickness of the coating was analyzed with an ultra-depth of field three-dimensional microscopy system and a vernier caliper, while the surface roughness of the specimens was measured through a surface topography measurement system. The friction and wear performance of different coatings and liners was investigated with a ball-disc contact SRV-4 high-temperature friction and wear tester. The three-dimensional white light interference profilometer was used to measure the surface wear topography. Based on the test data of two sliding bearing schemes (original liner scheme: FSZ-Z01, Cr; improved scheme: 7623-type liner, Al₂O₃) under 20 working conditions, an Archard model was used to establish a wear rate model for sliding bearings. Through simulation verification, with the liner thickness of 250 mm as the boundary, the two schemes were evaluated. The wear resistance of the improved liner scheme is approximately 4.6 times that of the original scheme, demonstrating the effectiveness of the bearing improvement scheme.

Key words

sliding bearing / wear capacity / wear rate / wear rate model / wear test / coatings / liners

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WU Yunzhang, WANG Qianxu, SHI Jinda, LI Jian, REN Yulou, SHEN Jun, GAO Fu. Wear Behavior of Coatings and Liners for a Certain Type of Helicopter Sliding Bearings[J]. Equipment Environmental Engineering. 2025, 22(12): 24-30 https://doi.org/10.7643/ issn.1672-9242.2025.12.004

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