| 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
|
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