What is the minimum operating temperature of silicon nitride bearings?

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At the temperature of liquid nitrogen (minus 196°C), silicon nitride can also be used.

  • Silicon nitride ceramic balls are precision ceramics sintered at high temperature in a non-oxidizing atmosphere. They have high strength, high wear resistance, high temperature resistance, corrosion resistance, acid and alkali resistance, can be used in seawater for a long time, and have good performance of electric and magnetic insulation. At 800 ℃, the strength and hardness are almost unchanged, and its density is 3.20g/cm3, which is almost 1/3 of that of bearing steel. Weight, small centrifugal force when rotating. High speed operation can be achieved. It also has self-lubricating properties, and it can be used in environments with high pollution without lubricating media. Become the preferred ball of ceramic bearings, hybrid ceramic ball bearings.
  • For many years, ceramic materials have been the most interesting materials for engineers engaged in bearing research. The term "ceramic bearing" usually refers to bearings made entirely of ceramic that run red and hot without lubrication. Much of the early work focused on the study of all-ceramic bearings in high-temperature environments, such as air turbine engine bearings. There is a continuing need for improved lubrication systems for such bearings. Recent development work has focused on hybrid bearings consisting of steel rings or raceways and ceramic balls. Hybrid bearings have been used in machine tool spindles, where there is an urgent need, and their use is becoming more and more widespread.
  • There are many kinds of ceramic materials, and their composition, microstructure and properties are different. It has been proven that silicon nitride materials have the best physical and mechanical properties when used in bearings. At present, the annual production of silicon nitride balls in the world is estimated at several million grains.