中 文  Favorites  |  Home  
Technical indicators
Technical data
Item unit Test standard Alumina
99% 94-96% 85% 50%
Density g/cm3 GB2413 ≥3.8 ≥3.72 ≥3.42 ≥2.64
Particle average size um Section microscopy 6 6 6 12
Water absorption % GB2413 0 0 0 0
Bubble - GB775.1 0 0 0 0
Colour - - white white white white or brown
Flexure strength MPa GB/T5593 ≥338 ≥320 ≥290 ≥160
Elasticity modulus GPa GB5594.2 ≥350 ≥300 ≥220 ≥140
Poisson's ratio - GB5594.2 0.20~0.25 0.20~0.25 0.20~0.25 -
Compressive strength MPa GB/T5593 ≥2400 ≥2000 ≥1500 ≥500
Hardness GPa HRA 82 80 73 70
Tension strength MPa GB775.3 ≥240 ≥190 ≥150 ≥45
Impact toughness MPa·m1/2 GB/T14389 4~5 4~5 3~4 -
Thermal conductivity coefficient W/m·°K GB5598 ≥27 ≥24 - -
Coefficient of linear expansion 1×10-6/℃ GB5594.3 6.5~8.2 6.5~8.0 6.5~8.5 5.0~6.0
Specific heat KJ/kj·°K GB5598 0.8~0.9 0.8~0.9 - -
Thermal shock resistance GB/T5593 800 800 420 190
Max. Tem. - 1600 1600 1400 -
Dielectric strength ac/kV/mm GB775.2

≥18

≥18 ≥15 ≥20
Dielectric constant - GB5597

9~10

9~10 ≤10 ≤7.5
Dielectric loss ×10-4 GB5594.4

≤2.5

≤2.5 ≤8 ≤20
Specific resistance 25℃ Ω·cm GB5594.5

≥1014

≥1014 ≥1014 ≥1014
500℃ Ω·cm GB5594.5

≥1010

≥109 ≥108 -
1000℃ Ω·cm GB5594.5 ≥106 ≥106 - -
Copyright (c) nj-tailong.com    Nanjing Xingtailong Special Ceramics Co., Ltd.,         
Address: Hengtai Road 1-1, Nanjing Economic and Technological Development Zone, China 210033     Tel:86-25-85303295 85329635  Fax:86-25-85305806   E-MAIL:longtao@nj-tailong.com