The main forms of material scrapping include wear, corrosion and fracture. However, about 70% – 80% of parts and equipment failures are caused by friction and wear during service every year. The working process with wear includes: relative rotation between shaft and bearing; High speed sliding between piston and cylinder sleeve; During steel rolling, the rolling rod and rolled material are in contact with each other, and there are both high-speed relative sliding and relative rotation; In addition, excavator bucket teeth, crusher lining plate, jaw plate rolling mortar wall, crushing wall and other parts will bear the wear of ore; In addition, in the grinding process of mineral pulp, refractory raw materials, cement, pulverized coal and other materials, alloy grinding balls and ball mill lining plates are worn by materials; The track shoe of agricultural tractor is worn by soil in the process of farming.
It can be seen that wear and tear widely exists in all aspects of industrial production and daily life. It is a bargaining chip of benefit and efficiency that can not be ignored in the national economy. In recent years, the research results of scholars from various countries on wear and tear in their respective countries show that the economic loss caused by scrapping materials due to wear is conservatively estimated to be hundreds of billions of dollars a year. Due to a large number of infrastructure construction in China in recent years, the economic loss caused by wear and tear is also extremely huge. According to statistics, the consumption of metal wear-resistant materials in China is about 5.5 million tons / year, including 700000 tons / year of roll consumption, more than 600000 tons of annual consumption of bucket teeth of various loaders, excavation engineering machinery, material conveying pipelines, jaw plates and hammers of crushers, grinding rollers and crawler shoes, more than 200000 tons of annual consumption of railway basins and wheels, and an amazing 2 million tons of various die steel, The annual loss caused by wear and tear in China is as high as more than 40 billion US dollars. The research on new wear-resistant materials and new forming methods of wear-resistant parts is of great significance to reduce the cost of social development caused by material wear.