改性h-BN/SiO2纳米添加剂增强轴向柱塞泵配流盘摩擦学性能OA

In axial piston pumps,fluctuations in operating conditions can cause the oil film to break down,leading to abrasive wear,adhesive wear,and even disc burning,which severely affects equipment reliability and service life.To improve their tribological properties,five groups of composite nano-lubricants are prepared using No.15 aviation hydraulic oil as the base oil,with hexagonal boron nitride(h-BN)and silicon dioxide(SiO2)nanoparticles modified by dehydrated sorbitan monooleate and hexadecyltrimethoxysilane,respectively.The success of the modification is confirmed using scanning electron microscopy.Fourier-transform infrared spectroscopy,and Raman spectroscopy,which also demonstrates a significant improvement in the dispersion stability of the nano-additives within the lubricant.Tribological tests using high-speed steel and tin bronze as friction pairs show that,compared to the base oil,the lubricant containing the modified h-BN/SiO2 composite nano-additives exhibits significantly reduced friction coefficients and wear rates.Further analysis using scanning electron microscopy,optical profilometry,and X-ray photoelectron spectroscopy reveals the mechanism by which the modified nanoparticles enhance the anti-friction and anti-wear performance of the distribution plate through the formation of a stable lubricating transfer film.This provides an effective strategy and theoretical basis for the development of novel nano-lubricants for high-performance hydraulic components.