Have the excellent performance of Good sealing, Excellent Resistant-Corrosion, High-Temperature Resistance , High Mechanical Strength, High hardness , Stable chemical property ,Wear Resistant, High Thermal Conductivity, Good Self-Lubrication, High purity alpha alumina and low silica content, Small Tolerance Range , Long Time Warranty, Stably and Professional Quality Control.
Surface Treatment: Polished, Alumina Purity: 95% to 99.5%, Color: White, Creamy.
Sizes: Various sizes available
Packaging: Standard carton boxes and pallets .
(The Alumina Ceramic seal ring is sintered into the friction material after high temperature.
Alumina can resist the general corrosion medium except hydrofluoric acid and dense alkali. But fragility of Alumina is very high, so it can be fractured with great changing temperature.
Have the property of good sealing, excellent resistant-corrosion, resistant-high-temperature, high mechanical strength, wear resistant, high thermal conductivity, good self-lubrication,used as seal faces, bearings and tubes in spacecraft, machinery, metallurgy, printing and dyeing, foodstuff, pharmaceutical, auto industry and so on. When the sic faces are combined with graphite faces the friction is the smallest and they can be made into mechanical seals which are able to work in highest working requirements. )
Technology Spec.:
95%, 96%, 99%, 99.5%, 99.6% Alumina Ceramic Ring
Density g/cm3 ≥3.68
Water absorption % O
Sintering temperature °C 1600-1800
Hardness HV ≥1500
Flexural strength Kgf/cm2 3000
Compressive strength Kgf/cm2 25000
Fracture toughness Map.m3/2 3~4
Maximum temperature °C 1800
Coefficient of thermal expansion /°C 8*10-6
Heat shock T(°C) 220
Thermal conductivity W/m.k(25-300°C) 25 14
20°C >1012
Volume resistivity 100°C >.cm 1012-1013
300°C >1010
Insulation breakdown strength KV/mm 18
dielectric constant 100MHz(E) 9.5
