Metal materials are commonly used in sliding bearing metal materials, including bearing alloy (also known as Pakistan alloy or white alloy), wear -resistant cast iron, copper -based and aluminum -based alloy.
(1) Bearing alloy (also known as Pakistan alloy or white alloy) The main alloy components are tin, lead, copper, to improve the strength and hardness of the alloy. According to national standards, Pakistan alloys can be divided into two types: tinlocular alloy and lead base alloy. The intensity and hardness of the lead consecration are lower than that of the tin conformity alloy, and the corrosion resistance is also poor. Therefore, when using Basal alloys, tinlocoli alloys are usually used, and its commonly used licenses include ZSNSB11CU6, ZSNSB8CU4, etc. Although the performance of the lead -based alloy is not as good as a tinlocular alloy, because it is more economical, it is still selected and used under the conditions of the requirements of the requirements. However, the melting point of bearing alloy elements is mostly low, so it is suitable for working conditions below 150 ° C.
(2) Copper -based alloys have high thermal conductivity and have better abrasion resistance compared to steel. And copper -based alloys have good processing and lubrication. Its inner walls can be processed and exposed to smooth surfaces with axis. Copper alloys used for sliding bearing materials are mainly: brass with copper and ingredients as the main ingredients; bronze with copper and tin as the main ingredients; and copper lead alloys (also known as lead bronze). Copper -based alloy is high, with good thermal conductivity and abrasion resistance. It allows the working temperature to be higher than that of Ba's alloys, but the compatibility, embedded and friction compatibility are not as good as that of Ba's alloys. The commonly used tin and phosphorus tin bronze is suitable for bearing with medium -speed overload or impact load; tin bronze containing tin, zinc, and lead is suitable for bearing of mid -speed mid -load.
Non -metal materials for cam bearing:
(1) Polytefluorolythene: It has excellent self -lubricating performance and higher thermal stability. Its friction factor is small, does not absorb water, not sticky, not burning, and can be used under the conditions of -180 ~ 250 ° C. However, there are also disadvantages such as large line swelling factor, poor size stability, poor thermal conductivity. In order to improve its performance, metal particles, fiber, graphite, and inorganic objects can be enhanced.
(2) Graphite: It is a good self -lubricating material, and because it is easy to process, and the more grinding, the smoother, so it is a preferred material for bearing. However, its mechanical properties are poor, the resistance of impact and tolerance is poor, and it is only suitable for light load occasions. In order to improve its mechanical properties, some easy -to -melt metals with good wear resistance are often used for impregnation treatment. Commonly used immersive materials include Pa's alloy, copper alloy, and tadpole alloy. The use temperature of the soaked alloy graphite bearing is 120 ~ 180 ° C, and the copper -soaked alloy graphite bearing is allowed to use the temperature of 300 ° C, and the working temperature allowed by the soaked alloy graphite bearing can reach 500 ° C.
(3) Rubber: It is a polymer with elastic bodies, which has good elasticity and vibration. However, its heat conduction is poor and difficult to process. The use temperature is below 65 ° C, and the circulating water needs to be continuously lubricated and cooled, so it is generally rarely used.
(4) Hard alloy: have a series of excellent performance such as high hardness, abrasion resistance, good strength and toughness, heat resistance, corrosion resistance, etc. Therefore, the sliding bearing of the processing is high, running smoothly, high hardness, good strength, good strength, good strength, good strength It is durable, but the price is expensive.
(5) Silicon carbide: It is a new type of inorganic non -metal material for artificial synthesis. The hardness is second only to diamond. It has excellent chemical corrosion resistance, abrasion resistance, high temperature resistance and high mechanical strength, good self -lubricating performance, small -temperature creep, small friction factor, high thermal guidance rate, low thermal expansion coefficient, etc. For oil, metallurgy, chemical, machinery, aerospace, and nuclear energy, it is often used as a sliding bearing and mechanical sealing friction side materials. A large number of tests show that silicon carbide is the best material in the current friction, especially the performance of non -pressure sintering SIC and hot -sintered sinic SIC.