A comparative investigation on wear behaviors of physical and chemical vapor deposited bronze coatings for hydraulic piston pump  

作　　者：Wei HAO Andrews LARBI Hongkang DONG Dongyun WANG Shenghu LI 

机构地区：[1]Zhejiang Provincial Key Laboratory of Urban Rail Transit Intelligent Operation and Maintenance Technology and Equipment,Zhejiang Normal University,Jinhua 321004,China [2]College of Engineering,Zhejiang Normal University,Jinhua 321004,China [3]Hangzhou Lilong Hydraulic Co.,Ltd,Hangzhou 311200,China

出　　处：《Chinese Journal of Aeronautics》2024年第3期391-403,共13页中国航空学报（英文版）

基　　金：supported by the Key Research and Development Program of Zhejiang Province,China(Nos.2020C01153,2022C01139)。

摘　　要：The cylinder block/valve plate interface is one of the most critical frictional interfaces of the swashplate-type axial piston pump.However,the poor lubrication interface caused rapid wear and high friction loss in an elastohydrodynamic lubrication system,decreasing the pump lifetime.Wear resistant bronze coatings were fabricated on 38CrMoAl substrate by Physical Vapor Deposition(PVD)and Chemical Vapor Deposition(CVD),respectively.Ball-on-disc wear tests were performed to comparatively investigate the wear behaviors of the coatings and bulk ductile iron samples.It can be found that the PVD-bronze coating exhibited better wear resistance than the other two samples.This enhanced wear resistance was attributed to the unique composite microstructure and desired mechanical strength,which could resist to mechanical shear and spallation,decreasing friction loss.The appropriate hardness of(1.33±0.07)GPa could be beneficial for enhancing its wear resistance.The PVD-bronze coating possessed a much lower and stable coefficient of friction(about 0.1)and wear rate(about 6000μm3.N-1.m-1)under the loading forces of about 100 N after 20 min.The wear mechanism was the abrasive wear.

关 键 词：Aircraft hydraulic pump BRONZE COATINGS Wear resistance MECHANISMS 

分 类 号：V245.1[航空宇航科学与技术—飞行器设计]