Research On Tribological Properties And Life Effects Of Mechanical Equipment By Surface Modification

As an important basis of industrial production,the mechanical equipment plays a key role in improving quality,quantity and efficiency and security of industrial production.Nevertheless,the friction and wear of moving parts of the mechanical equipment are bottlenecking technologies impacting reliability and life of mechanical equipment.This study focuses on the demand of high-performance lubricating material technology for the movement system of mechanical equipment.Through in-depth organic ester lubricating based oil and carbon-based coating studies,characteristics of high-performance synthetic lubricating material have been known well and applied to the surface of movement system of mechanical equipment.Effects of key technology index such as anti-friction,energy saving,operating life and reliability of the mechanical system are studied.Fullerene-like hydrogenated carbon?FL-C:H?films were prepared on Si substrates,steel and Si₃N₄ balls by plasma enhanced chemical vapor deposition.High-resolution transmission electron microscopy,X-ray photoelectron spectroscopy,micro-Raman spectra and Reflection fourier-transform infrared spectra were employed to reveal the films'microstructures.The mechanical and tribological properties of fullerene-like hydrogenated carbon films were investigated by Tribo Indenter in-situ nanomechanical test system and UMT-3 tribometer.Their wear tracks and scars were analyzed by scanning electron microscopy?SEM?and 3D surface profiles.The main results were as follows:?1?Depositing FL-C:H films on steel or Si₃N₄ counterbody is an effective way to achieve lower friction coefficient and wear rate in humid environments.?2?The tribological differences of FL-C:H coated steel and Si₃N₄ balls can probably be explained by the changes of these films'structures and mechanical properties.?3?The doped N FL-C:H film exhibits high hardness,good elasticity recovery,a very smooth morphology and low friction and wear.N atoms promote the formation of more cross-linked fullerene-like structure,while F atoms terminate sp² bond linking state of curved graphitic,and thus destroy the fullerene-like continuous network structure.?4?The coefficient of friction is lowered approximately 48%or 41%when FL-C:H film was respectively deposited on steel balls that were chosen as a sliding counterpart under PAO6 as lubricants.Compared with uncoated steel or Si₃N₄ balls,the wear rate is decreased by about 82%or 76%for the FL-C:H coated steel or Si₃N₄balls under engine oil as lubricants.?5?The wear rate of FL-C:H film and FL-C:H film contact exhibited a decrease,and the coefficient friction of FL-C:H film and FL-C:H film contact showed an increase under PAO6 and engine oil as lubricants.Compared with FL-C:H film and FL-C:H film contact,the wear life is obviously improved.?6?The Si substrate-film with 3 h,against the steel ball-film with 2 h and 3 h,exhibit super-low friction and super-long wear life.The excellent friction behaviors are closely linked with both fullerene-like structures with in the carbon films and the sliding induced at friction interfaces.