Ceramic Mechanical 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. It is widely used in machinery, chemical industry, petroleum, pharmaceutical, automobile and other fields. Because of its advantages, it has become Sealcon's great choice for sealing materials.
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.
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.
Mechanical seals has the high demands about sealing materials, so the ceramic is choosed to make ceramic seals for water pumps because of its competitive features.
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 |
Tag: Mechanical Seals
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Friday, June 01, 2007
Quantity : 1 000 000 - Price : US$127/ton
We wish to import copper and cobalt concentrates from the D R Congo into Zambia. Please contact us quickly for earliest business. This will be a contract arrangement for a period of 5 years and will be paid on a monthly basis in leu of collection. Please note that we require high...
Chemtec Enterprises Ltd
- chemtec
- 280051 - Kitwe
- +2602225669
- +26 0 95 46 00 93
Saturday, May 05, 2007
Quantity : 1kg - Price : 3$
We export dried herring with high quality to Russian, Ukraina, Korean, Malaysian, Hong Kong Markets... Our company is one of VASEP (VietNam Association of Seafood Exporters and Producers) members. If you interested in my products please contact us, we're willing to send you our samples...
DKPT SEAFOOD.,LTD
- dekhangphuthanh
- 84 - Ho Chi Minh
- +84 6 50 77 44 83
- +84 9 18 77 05 46
Sunday, January 03, 2010
Quantity : Régulier
Nous cherchons un partenariat sur le long terme avec des plateformes de SAV pouvant nous fournir en éléctroménager, meuble, ordinateur, produit audio .... de retour client. Annonce sérieuse .Location : 19, avenue Tolosane, 31520 RAMONVILLE, Contact : Fabrice Gardelle,