High Purity 99% Polishing Aluminum Oxide Ceramic Round Bar Customized Size
ISO Alumina Ceramic Rod Al2o3 Ceramic Electrical Insulation Surface Polishing
1.Alumina ceramic
Alumina ceramic has the advantages of super hardness, high wear-resisting,good corrosion resistance and electric insulation,resistant acid-base,high intensity,thermostable,high temperature tolerance,good insulation,high strength,precision process,high mechanical strength,good chemical stability.
Good smoothness, mechanical seal good, polishing surface and so on.
2.Forming methods includes
Drying pressing
Isostatic pressing
Hot pressing casting
3.Features
1) A variety of specifications available.
2) Satisfy various technical request
3) Lower medium spoilage
4) Good insulation performance and high temperature resistance
5) Stiffness texture
6) Used in all electric products, electric heating products and wear resistant machinery parts.
4.Technical Data
|
Item
|
Test Condition
|
Unit Symbol
|
95%Alumina ceramics
|
99%Alumina ceramics
|
99.7%Alumina ceramics
|
|
The main chemical ingredient
|
|
|
Al2O3
|
Al2O3
|
Al2O3
|
|
Bulk Density
|
|
g/cm3
|
3.6
|
3.89
|
3.96
|
|
Maximum Use Temperature
|
|
|
1450°C
|
1600°C
|
1650°C
|
|
Water absorption
|
|
%
|
0
|
0
|
0
|
|
ROHS Hardness
|
|
|
≥85
|
≥89
|
≥89
|
|
Flexural strength
|
20° C
|
MPa (psi x 103)
|
358 (52)
|
550
|
550
|
|
Compressive Strength
|
20° C
|
MPa (psi x 103)
|
2068 (300)
|
2600(377)
|
2600(377)
|
|
Fracture Toughness
|
K(I c)
|
Mpa m1/2
|
4-5
|
5.6
|
6
|
|
Coefficient of
thermal expansion |
25-1000° C
|
1X 10-6/°C
|
7.6
|
7.9
|
8.2
|
|
Coefficient of
thermal conductivity |
20° C
|
W/m °K
|
16
|
30.0
|
30.4
|
|
Thermal Shock Resistance
|
Tc
|
°C
|
250
|
200
|
200
|
|
Dielectricity constant
|
1MHz.25°C
|
|
9
|
9.7
|
9.7
|
|
Dielectric strength
|
|
ac-kV/mm (ac V/mil)
|
8.3 (210)
|
8.7 (220)
|
8.7 (220)
|
|
Volume Resistivity
|
100°C
|
ohm-cm
|
> 1013
|
> 1014
|
> 1014
|
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