Date: 2013-08-20

The ceramic material used in the bearing manufacturing industry

Silicon nitride ceramic bearings are mainly used in four aspects: 1, high-speed bearings; 2, high temperature bearings; vacuum bearings, corrosion bearings. Silicon nitride ceramic bearings have been able to work in special circumstances and conditions, and is entirely due to the performance of silicon nitride ceramics. Silicon nitride ceramic ceramic bearing has the following advantages:
1, high-speed
The weight of the ceramic material is only 40% of the equivalent weight of steel, the density characteristics can be realized to the weight and the speed of the bearing, so that the ceramic bearing is rotating at high speed due to the centrifugal force caused by the increase of the rolling element load can be suppressed and the slip , the speed of the ceramic bearing steel bearing 1.3 to 1.5 times, the DN value of up to 300 million, for example, angular contact ball bearings, the contact angle between the rolling element and raceway rotational slide, When the density ceramic rolling elements, not only rotating sliding small, bearing heating and surface damage play a useful role, is also very useful for aerospace vehicles.
2, high rigidity
Much higher modulus of elasticity than the metal of the silicon nitride ceramic is 1.5 times that of metal, and thus by the force of the elastic deformation is small, the relative load of a high rigidity, stiffness can be improved about 15% ~ 20%, thereby reducing the machine vibrations. Get a good value in high-precision systems, such as ultra-precision machine tool spindle, high precision aerospace bearings.
3, long life
Dislocations due to the ceramic material is small, the mobility is low, and having a high hardness, the ships 1 times higher than the hardness of the metal, it is possible to reduce wear and tear so that the ceramic bearing having a good wear resistance. In addition, the mechanical strength of the silicon nitride ceramic is not low, its tensile strength and bending strength with metal; high compressive strength, which is about 5 to 7 times of the metallic material, especially under high temperature conditions, still able to maintain a high strength and hardness, even in the 1200 ° C when the intensity remained unchanged, little flaking failure in the case of a contaminant, the ceramic balls, and therefore good ceramic bearings, pressure marks usually have a longer life ships increased by 3-5 times compared with steel bearings.
4, low heat build-
Due to the low coefficient of friction of the silicon nitride ceramic material, about 30% of the standard bearing steel, so compared with the metal material of poor thermal conductivity of the silicon nitride ceramic, and therefore the small amount of heat is generated when the ceramic bearings work, prolong the life of the grease.
5, low thermal expansion
The coefficient of thermal expansion of the silicon nitride ceramic is about 20% of the bearing steel, and therefore the size of the temperature change of the ceramic bearings with a small amount of change, and the heat generated by the pre-set low, thus avoiding excessive heat accumulation fatigue spalling failure, useful at the temperature changes in the environment.
6, the corrosion resistance
Inactive chemical properties of ceramic materials, the corrosion resistance of the ceramic bearings, ceramic bearings steel bearings and premature failure due to the lack of chemical resistance can be used for all applications, such as chemical machinery and equipment, food, marine and other departments of mechanical and nuclear equipment.
7, non-magnetic
Strong magnetic environment, the use of steel bearing wear down from the bearing itself micronized adsorption between the rolling elements and raceway, bearing off in advance the main reason for damage, noise increases due to ceramic bearings is completely non- magnetic, and having a normal carrying capacity, it can be used in a need to completely non-magnetic bearing Occasion.
8, insulating
Ceramic material often retire relatively high resistivity can be used as the insulating material preferably, from arc damage the bearing.

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