What material is ceramics?

Ceramics are inorganic nonmetallic materials.

It has the advantages of high melting point, high hardness, high wear resistance and oxidation resistance. It can be used as structural materials and tool materials, because ceramics also have some special properties and can also be used as functional materials.

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mechanical properties

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

thermal performance

Ceramic materials generally have a high melting point (mostly above 2000℃) and excellent high-temperature chemical stability; The thermal conductivity of ceramics is lower than that of metal materials, and ceramics are still good thermal insulation materials. At the same time, the linear expansion coefficient of ceramics is lower than that of metals, and ceramics have good dimensional stability when the temperature changes.

electrical characteristics

Most ceramics have good electrical insulation, so they are widely used to make insulating devices with various voltages (1kV~ 1 10kV). Ferroelectric ceramics (BaTiO3) have high dielectric constant and can be used to manufacture capacitors. Ferroelectric ceramics can also change shape under the action of external electric field, converting electric energy into mechanical energy, and can be used as amplifiers, record players, ultrasonic instruments, sonar, medical spectrographs and so on.