What is the proper sintering temperature for powder metallurgy bearings?

What is the proper sintering temperature for powder metallurgy bearings?

The powder metallurgy bearing is made of metal powder and other antifriction materials by pressing, sintering, shaping and oil immersion. It has a porous structure. After soaking in hot oil, the pores are filled with lubricating oil. During operation, due to the suction effect of journal rotation and friction heating, the metal and oil are heated and expanded, and the oil is squeezed out of the pores, thus the friction surface plays a lubricating role. After the bearing cools, the oil is sucked back into the pores.

powder metallurgy

Sintering is a key process in powder metallurgy bearing technology. The formed compact can obtain the required final physical and mechanical properties through sintering. Sintering can be divided into unit system sintering and multi-element system sintering. For the solid state sintering of single system and multicomponent system, the sintering temperature is lower than the melting point of the metals and alloys used; For the liquid phase sintering of multicomponent systems, the sintering temperature is generally lower than the melting point of the refractory components, but higher than the melting point of the fusible components. What is the proper sintering temperature? Let's take a look at it together with Zhongwei Precision Editor:

The sintered bearing material of iron bronze is prepared by sintering powder metallurgy bearing with adding iron powder into tin bronze powder. The relationship between the addition of iron content, shrinkage and wear resistance is discussed. The optimal addition amount of iron powder is 40%. According to the sintering principle and state diagram of iron copper alloy, it is concluded that the sintering temperature of iron copper alloy increases with the increase of iron powder addition, and the optimal sintering temperature is 820-850 ℃.

Generally speaking, powder metallurgy bearings can be formed at one time without cutting. The cost is lighter than machining, and the material waste is less, so the price is cheaper. It is also in line with the current national policy of promoting energy conservation, so it is considered to be a technology that will not be outdated, and the application of powder metallurgy bearings is becoming more and more extensive.