Wear is when the surface contact and move relative to each other, gradually lost that material from a surface phenomenon of surface damage. Usually will wear their surfaces damage mechanisms and features are divided into four categories: abrasive and adhesive wear and surface fatigue wear and corrosion.
Second, abrasive wear
Surfaces with abrasive material losses caused by friction between the surface phenomenon known as abrasive wear. Abrasive wear is a kind of mechanical wear, verypopular, are very dangerous, according to the statistics, 50% per cent of total abrasive wear of wear. When the unit when powered sites in the wild, due to poor working conditions, direct contact with the sediments, ores and slag, etc, will have a different form of abrasive wear.
Abrasive wear is the result of abrasive mechanical action, its relative to the abrasive hardness, shape, size and loading of abrasive and mechanical properties of theground surface. Source of abrasive dust, chips into the outside world, fluid into the microstructure surface, surface wear, hard points and inclusions. Abrasive wear includes two things: first is that rough metal surfaces in a relatively soft metal surface sliding wear; the second is a hard metal to soft metal friction surfaces free of wear caused by abrasive, such as bearings and bearing, cylinder wear. Reduce abrasive wear General measures in two ways: one is to prevent or reduce the grain into the friction surface; the second is enhanced anti-wear property of the component.
Third, adhesive wear
Friction surface relative movement Shi, due to friction in local will produced large of hot, led to temperature sharply increased led surface metal melting, with heat constantly to around passed, parts surface of temperature will gradually declined and produced welding collection role, welding collection in then of movement in the and was tore, led to contact surface of material from a surface transfer to another surface of phenomenon called adhesive wear, as hold w, and pulled cylinder,.
IV, surface fatigue
Two contact surfaces for rolling or scrolling when the sliding friction, in the presence of cyclic exposure to stress, made of small surface fatigue cracks. With the crack, and because the grease in the crack of high pressure, physical deterioration phenomena produced by Fleck, called surface fatigue and wear. Surface wear of bearing surface wear and gear.
Finally, corrosion and wear
In the process of friction, chemical or electrochemical reaction of metal and the surrounding medium. Parts due to the combined effect of corrosion and wear material damage on the surface, this phenomenon is known as corrosion. Corrosion is achemical mechanical wear. Simple corrosion phenomenon cannot be defined for corrosion and wear only when corrosion and mechanical wear process combined to form. Corrosion and wear of these three mechanisms, it is an extremely complicated process of wear, often occur in hot or humid environments, more prone to acid, alkali, salt, and other special media conditions.