Ceramic bearing performance

Ceramic materials are the materials with the best stiffness and highest hardness among engineering materials, and their hardness is mostly above 1500HV. Ceramics have high compressive strength, but low tensile strength, and poor plasticity and toughness.

Mechanical properties

Thermal properties

Ceramic materials generally have high melting points (mostly above 2000°C) and have excellent chemical stability at high temperatures; the thermal conductivity of ceramics is lower than that of metal materials, and ceramics are also good heat insulation materials. At the same time, the linear expansion coefficient of ceramics is lower than that of metals. When the temperature changes, ceramics have good dimensional stability.

Electrical properties

Most ceramics have good electrical insulation properties and are therefore widely used in the production of insulation devices with various voltages (1kV~110kV). Ferroelectric ceramics (barium titanate BaTiO3) have a high dielectric constant and can be used to make capacitors. Ferroelectric ceramics can also change shape under the action of an external electric field and convert electrical energy into mechanical energy (having the characteristics of piezoelectric materials). It can be used as amplifier, record player, ultrasonic instrument, sonar, medical spectrometer, etc. A few ceramics also have semiconductor properties and can be used as rectifiers.

chemical properties

Ceramic materials are not easily oxidized at high temperatures and have good corrosion resistance against acids, alkalis, and salts.

Optical properties

Ceramic materials also have unique optical properties and can be used as solid laser materials, optical fiber materials, optical storage, etc. Transparent ceramics can be used in high-pressure sodium lamp tubes, etc. Magnetic ceramics (ferrites such as MgFe2O4, CuFe2O4, Fe3O4) have broad prospects for application in audio tapes, records, transformer cores, and large computer memory components.