What kinds of bearing materials are there?

The materials of bearings are divided into ceramic bearings and plastic bearings. Performance comparison of ordinary bearing steel AISI52 100(GCr 15), stainless steel AISI440(9Cr 18), silicon nitride (Si3N4) and zirconia (ZrO2 _ 2).

As an important mechanical basic component, ceramic bearing is in the leading position in the field of new materials with its unparalleled excellent performance, high temperature resistance and super strength. In recent ten years, it has been widely used in various fields of national economy and people's livelihood.

Plastic bearings can generally be divided into plastic rolling bearings and plastic sliding bearings; The working principles of plastic rolling bearings and plastic sliding bearings can be distinguished by their names, and the friction produced when plastic rolling bearings work is rolling friction.

However, plastic sliding bearings will produce sliding friction when working; The size of rolling friction mainly depends on manufacturing accuracy; The friction force of plastic sliding bearing mainly depends on the material of sliding surface of bearing.

Extended data:

First, the advantages of plastic bearings:

1, all-plastic bearing is made of lubricating material, with long service life;

2. Plastic bearings will not rust and resist corrosion in use, while metal bearings are easy to rust and cannot be used in chemical liquids;

3. The weight of plastic bearing is lighter than that of metal, which is more suitable for modern lightweight design trend;

4. The manufacturing cost of plastic bearings is lower than that of metal bearings; Plastic bearings are injection molded, which is suitable for mass production.

5. The plastic bearing is noiseless in operation and has certain damping function;

6, plastic sliding bearing is suitable for high and low temperature work -200 ~+250 degrees;

Plastic sliding bearings can be made not only into the shape of shaft sleeves, but also into plastic linear sliding bearings, but only if the materials are self-lubricated to improve their comprehensive wear resistance.

For example, the common plastic linear bearing on the market at present is made of engineering plastics modified by lubricants and reinforced fibers, and has excellent wear resistance.

Because plastic sliding bearings have many advantages over metal sliding bearings, the output of plastic bearings is expanding day by day, and the application of plastic bearings is also expanding.

From fitness equipment to office equipment and automobile industry, plastic bearings are used. At present, there is no car on the road that does not use plastic bearings.

Second, the advantages of ceramic bearings:

First, because ceramics are almost not afraid of corrosion, ceramic rolling bearings are suitable for working in harsh conditions full of corrosive media.

Secondly, because the density of ceramic ball is lower than that of steel and its weight is much lighter, the centrifugal effect of the outer ring can be reduced by 40% when rotating, and the service life can be greatly prolonged.

Thirdly, ceramics are less affected by thermal expansion and contraction than steel, so the bearing can be allowed to work in an environment with severe temperature difference when the bearing clearance is fixed.

Fourthly, because the elastic modulus of ceramics is higher than that of steel, it is not easy to deform when stressed, which is beneficial to improve the working speed and achieve higher accuracy.

References:

Baidu encyclopedia-plastic bearings

Baidu encyclopedia-ceramic bearings

Baidu encyclopedia-bearings