Ceramic Seal
Mechanical Sealing Material

Ceramic Seal

Ceramic material refers to inorganic non-metallic materials made of natural or synthetic compounds through forming and sintering. It has the advantages of high melting point, high hardness, high wear resistance and oxidation resistance. A ceramic O-ring, also known as a ceramic seal, is a type of sealing device made from ceramic materials. Ceramic mechanical seal is widely used in machinery, chemical industry, petroleum, pharmaceutical, automobile and other fields. Because of its advantages, ceramic shaft seal has become Sealcon’s great choice for sealing materials.

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Ceramic Material Properties

Mechanical seals has the high demands about sealing materials, so the ceramic is choosed to make ceramic mechanical seal because of its competitive features.

Mechanical characteristic

Ceramic material is the material with the best rigidity and highest hardness in engineering materials, and its hardness is mostly above 1500HV. Ceramics have high compressive strength, but low tensile strength, poor plasticity and toughness. Ceramic seals perfectly inherit these characteristics.

Thermal characteristic

Ceramic materials generally have high melting point (mostly above 2000), and have excellent chemical stability at high temperature. The thermal conductivity of ceramics is lower than that of metal materials. At the same time, the linear expansion coefficient of ceramics is lower than that of metal. When temperature changes, ceramics have good dimensional stability.

Electrical characteristic

Most ceramics have good electrical insulation, so a large amount of insulation is used to make all kinds of voltages (1kV~110kV). Ferroelectric ceramics barium titanate (BaTiO3) has high dielectric constant which can be used in the production of capacitor, ferroelectric ceramics. A few ceramics also have the characteristic of semiconductor, can be a rectifier.

Chemical characteristic

Ceramic material is not easy to be oxidized at high temperature, and has good corrosion resistance to acid, alkali and salt.

Optical characteristic

Ceramic materials also have unique optical properties, which can be used as solid laser materials, optical fiber materials, optical storage containers, etc. Transparent ceramics can be used in high-pressure sodium lamp tubes.Magnetic ceramics (ferrites such as MgFe2O4, CuFe2O4, Fe3O4) have a wide range of applications in recording tapes, records, transformer cores, and large computer memory components.

Physical Property of Ceramic Seal Ring

ceramic physical property
technical parameter unit 95%Al2O3 99%Al2O3 99.5%Al2O3
content of Al2O3 % 95 99 99.5
density g/cm3 3.7 3.88 3.9
hardness HRA 85 88 90
porosity rate % 0.4 0.2 0.15
fractural strength MPa 250 310 350
coefficient of heat expansion 10(-6)/K 5.5 5.3 5.2
thermal conductivity W/M.K 27.8 26.7 26
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Knowledge Center VIEW ALL
  • Basic Properties Of Ceramic Materials
    May 03 , 2018
    Basic Properties Of Ceramic Materials
    It is not possible to use common ceramic materials in sealing devices. Engineering ceramics (i.e. structural ceramics) should be used, the main types of which are Al2O3, ZrO2, SiC and so on. These eng...
  • Sealing Properties Of Ceramic Material
    May 06 , 2018
    Sealing Properties Of Ceramic Material
    The surface properties of the ceramic seal ring can be made full use of the surface characteristics of the ceramic material, which is the same as the surface of the metal material. Although the surfac...