Physical Characteristics
|
Item
|
Brown
Aluminum Oxide
|
White
Aluminum Oxide
|
Pink
Aluminum Oxide
|
Black
Silicon Carbide
|
Green
Silicon Carbide
|
|
Basic mineral
|
α-Al2O3
|
α-Al2O3
|
α-Al2O3
|
α-SiC
|
α-SiC
|
|
Crystal system
|
Hexagonal
|
Hexagonal
|
Hexagonal
|
Hexagonal
|
Hexagonal
|
|
Crystal color
|
Brown
|
White
|
Pink
|
Black
|
Green
|
|
Density
|
＞3.90g/cm3
|
＞3.90g/cm3
|
＞3.90g/cm3
|
＞3.12g/cm3
|
＞3.18g/cm3
|
|
Mohs hardness
|
9
|
9
|
9
|
9.15
|
9.15
|
|
Micro hardness
|
HV1800-2200
|
HV2200-2300
|
HV2200-2300
|
HV3100-3280
|
HV3280-3400
|
|
Grinding ability
(compared with
diamond as one)
|
0.10
|
0.12
|
0.12
|
0.25
|
0.28
|
|
linear expansion
coefficient(when
900℃α·10-6k-1)
|
7.6
|
8.3
|
8.3
|
4.4
|
4.6
|
|
Electrical resistivity
|
1014～1016Ω· cm
|
3×105～3×107Ω· cm
|
|
