Ceramic bearing material explanation

The most common on the market at present commonly used have a silicon nitride ceramic bearing ceramic bearings, zirconia ceramic bearings and silicon carbide ceramic bearing these three materials, for these three materials bearing choice how should we do? Don't worry, we first take a look at them before the material properties. 1, the silicon nitride ceramic bearing nitride is a kind of important structure ceramic materials. It is a kind of super hard material, itself has the lubrication, and wear resistance, as the atomic crystal; When high temperature oxidation resistance. And it also can resist cold and hot shock, in air heated to above 1000 ℃, a sharp cooling heating sharply again, also won't fracture. It is because of silicon nitride ceramics with such excellent properties, people often use it to manufacture bearings, steam turbine blades, mechanical seal, mechanical components, such as permanent mould. Product features 1) High speed: with cold resistance, small mechanical elasticity, resistance to high pressure, poor thermal performance, light weight, the advantages of small friction coefficient, can be used in the 12000 RPM to 75000 RPM of high-speed spindle and other high precision equipment; 2) High temperature resistant: material itself has resistance to high temperature 1200 ℃, and good self-lubrication, using temperature at 100 ℃ Do not produce because of the difference in temperature between 800 ℃ caused by inflation. Can be used in the furnaces, high temperature equipment such as plastic, steel; 3) Corrosion resistance: material itself has the property of corrosion resistance, can be used in strong acid, strong alkali, inorganic, organic salt, water, and other fields, such as electroplating equipment, electronic equipment, chemical machinery, shipbuilding, medical equipment, etc. 4) Magnetically: because there was no magnetic dust absorption, can reduce the bearing early spalling, large noise, etc. Available in the demagnetization device. Precision instruments and other fields. 5) Electric insulation: high electric resistance, can avoid damage of bearing arc, available in various requirements of the insulation power equipment. 6) Vacuum: ceramic materials have the oilless self-lubrication characteristic, in the ultra high vacuum environment, silicon nitride ceramic bearing all can not overcome the ordinary bearing lubrication problem. 2, zirconia ceramic bearing zirconium dioxide ( Chemical formula: ZrO2) Is the main zirconium oxide, usually under the condition of white odourless tasteless crystal, soluble in water, hydrochloric acid and dilute sulphuric acid. General often contains a small amount of hafnium. Chemical inertness and high melting point, high resistivity, high refractive index and the properties of low thermal expansion coefficient, make it become a important high temperature resistant materials, insulation materials and ceramic sunscreen. Product features 1) High speed: with cold resistance, small mechanical elasticity, resistance to high pressure, poor thermal performance, light weight, the advantages of small friction coefficient, can be used in the 12000 RPM to 50000 RPM of high-speed spindle and other high precision equipment; 2) High temperature resistant: using temperature at 100 ℃ Do not produce because of the difference in temperature between 600 ℃ caused by inflation. Can be used in the furnaces, high temperature equipment such as plastic, steel; 3) Corrosion resistance: material itself has the property of corrosion resistance, can be used in strong acid, strong alkali, inorganic, organic salt, water, and other fields, such as electroplating equipment, electronic equipment, chemical machinery, shipbuilding, medical equipment, etc. 4) Magnetically: because there was no magnetic dust absorption, can reduce the bearing early spalling, large noise, etc. Available in the demagnetization device. Precision instruments and other fields. 5) Electric insulation: high electric resistance, can avoid damage of bearing arc, available in various requirements of the insulation power equipment. 6) Vacuum: ceramic materials have the oilless self-lubrication characteristic, in the ultra high vacuum environment, zirconia ceramic bearings can not overcome the ordinary bearing lubrication problem. 3, the hardness of silicon carbide silicon carbide ceramic bearing is very big, mohs hardness of 9. Level 5, second only to the world's most hard diamond ( (10) , good thermal conductivity, is a kind of semiconductor, can oxidation resistance at high temperature. Chemical performance is stable, high thermal conductivity, small thermal expansion coefficient, good wear resistance, etc. Silicon carbide ceramic bearing ring and all adopts roller pressure of silicon carbide ( SSIC） Ceramic material, the machine can be used PTFE as standard, compared with zirconia bearing materials and silicon nitride bearing material, can be used in higher temperature and more harsh corrosive environments such as extremely harsh environment and special places. For example: the high temperature environment ( Suggest using full ball ball) , its a few can afford to 1300 ℃. And as in the high corrosive chemicals ( It is recommended to use a cage type material for PTFE) Have a longer wear resistance and service life, because of its hardness up to HRC90 degrees. Compared with other several types of ceramic bearing, silicon carbide bearing SiC materials have high chemical corrosion resistance good strength, high hardness, high wear resistance, low friction performance, apply to the highest temperature, etc. Watching the author of three kinds of ceramic bearing materials, I believe you have a certain understanding, you first according to their own requirements to determine when the choose and buy.