Study on Processing Performance and Research of Wear - resistant Aluminum Duct
Wear-resistant aluminum Duct cast aluminum alloy because it contains a sufficient amount of eutectic Si element, wear resistance is better, but its poor mechanical properties, the use of most of the range of manufacturing equipment, daily necessities, building doors and windows.
Pressure-modified deformed aluminum alloys have good mechanical properties and are widely used in industry. Wear-resistant aluminum Ducts There are some reports on the mechanical deformation of pure aluminum, in addition to the aluminum alloy, especially Al-Si alloy wear a lot of research. However, little is known about the dry friction properties of deformed aluminum alloys. The study of the friction and wear properties of the deformed aluminum alloy is based on the surface modification process after the treatment is in line with the performance requirements, the deformation of aluminum alloy on the wear resistance of little research.
In this paper, five kinds of deformed aluminum alloy and martensitic stainless steel and austenitic stainless steel friction plate in the temperature of 15 ℃, air humidity of 40g / m3 under the laboratory in the absence of lubrication dry friction in the M2000 friction The experimental study was carried out under the same dry friction condition at a fixed pressure of 200 N and a speed of 200 r / min (0.424 m / s) for 2 h friction and wear experiments. Each of the deformed aluminum The alloys were tested under experimental conditions in five groups. M2000 friction and wear tester to get the friction coefficient and the weighing method to obtain the volume wear rate after the data processing analysis, their wear resistance were compared by scanning electron microscopy (SEM) to observe the wear surface, energy spectrometer analysis of surface micro-area The microstructure and mechanical properties of the deformed aluminum alloy were obtained. The friction and wear mechanism of the deformed aluminum alloy were obtained. The results show that the average friction coefficient of the five kinds of deformed aluminum alloy and martensitic stainless steel is 0.3 ~ 0.4 between the five deformed aluminum alloy and austenitic stainless steel, the average coefficient of friction between 0.4 to 0.5, numbered A #, E # relative to a relatively small coefficient of friction and volume wear rate, deformation of aluminum alloy under the action of the load Plastic deformation and work hardening, deformation of aluminum alloy friction and wear process can be divided into three stages.
The first stage, the slight wear stage; the second stage, the mechanical mixing layer formation stage; the third stage, the mechanical mixing layer formation, stripping wear. The influence of process parameters on the wear resistance of ceramic layer under oil lubrication condition was studied by wear test. The results show that the hard ceramic layer can be obtained by micro-arc oxidation under the intervention of plasma oxidation. On the surface of the ceramic layer, there are "spray holes" of the order of microns, and the nanometer The presence of micropores in the ceramic layer is helpful to improve the wear resistance of the ceramic layer under the condition of oil lubrication. The higher the current density, the faster the growth rate, resulting in the ceramic layer surface adhesion type ceramic small particles The higher the surface roughness of the ceramic layer, the greater the wear and tear wear; the choice of frequency and duty cycle affects the size of the single pulse energy, too high and too low are not conducive to the formation of wear-resistant ceramic layer; the same preparation conditions , The thickness of the ceramic layer only affects the wear and run-in time of the run-in period and the running-in time, but it has little effect on the wear weight loss rate in the stable wear stage. The optimum process conditions can be used to prepare the micro- Oxidation of ceramic layer; lubrication conditions, aluminum alloy micro-arc oxidation ceramic layer wear resistance is better than electroplating hard chrome and phosphorus vanadium copper cast iron.