- アルミナ99.9%
- 純度99.9%の高純度材料です。
- アルミナ99.5%
- 強度・電気絶縁・耐摩耗性と非常にバランスの取れた高純度品の汎用グレードです。
- アルミナ96.0%
- メタライズ性に優れたグレードです。
- 窒化ケイ素
- 高温での機械強度が大きく、耐熱衝撃性に優れます。
- 炭化ケイ素
- 硬度が非常に高く、耐摩耗性に優れています。高温でも強度が劣化しません。
| Type | Alumina | Silicon nitride | Silicon carbide | ||
|---|---|---|---|---|---|
| Composition | Al2O3 99.9% | Al2O3 99.5% | Al2O3 96.0% | Si3N4 | SiC |
| Color | Flesh | Pale Flesh | White | Gray | Black |
| Bulk Density (g/cm3) | 3.9 | 3.9 | 3.7 | 3.2 | 3.1 |
| Water Adsorption Ratio (%) | 0 | 0 | 0 | 0 | 0 |
| Bending Strength (Mpa) | 350 | 340 | 310 | 880 | 490 |
| Conpressive Strength (Mpa) | 2900 | 2900 | 2400 | 2940 | – |
| Young’s Ratio (Gpa) | 400 | 350 | 310 | 290 | 390 |
| Poisson’s Ratio | 0.24 | 0.23 | 0.24 | 0.28 | 0.16 |
| Vickers Hardness (Gpa) | 15 | 15 | 11 | 16 | 20 |
| Volume Resistivity [RT] [RT] (Ω･cm) |
2 x1015 | 1 x1015 | 0.1 x1015 | – | – |
| Volume Resistivity [RT] [500℃] (Ω･cm) |
0.2 x 1012 | 60 x109 | 40 x106 | – | – |
| Dielectric Constant [1MHZ] |
10 | 10 | 9.5 | – | – |
| Dielectric Tangent [1MHz] |
0.0004 | 0.0004 | 0.0004 | – | – |
| Dielectric Strength (kV/mm) | ＞10 | ＞10 | ＞10 | – | – |
| Max. Useable Temperature (℃) |
1600 | 1500 | 1500 | 1200 | – |
| Thermal Expansion Coefficient [RT-200℃] (/℃) |
6.5 x 10-6 | 6.5 x 10-6 | 6.4 x 10-6 | – | – |
| Thermal Expansion Coefficient [RT-400℃] (/℃) |
7.0 x 10-6 | 7.0 x 10-6 | 6.9 x 10-6 | – | – |
| Thermal Expansion Coefficient [RT-600℃] (/℃) |
7.5 x 10-6 | 7.5 x 10-6 | 7.4 x 10-6 | – | – |
| Thermal Expansion Coefficient [RT-800℃] (/℃) |
7.9 x 10-6 | 7.9 x 10-6 | 7.5 x 10-6 | 3.2 x 10-6 | 4.2 x 10-6 |
| Thermal Conductivity [RT] (W/m･K) |
38 | 30 | 24 | 25 | 75 |
| Thermal Conductivity [400℃] (W/m･K) |
14 | 13 | 11 | – | – |
| Thermal Conductivity [800℃] (W/m･K) |
11 | 9 | 8 | – | – |
| Specific Heat [RT] (kJ/kg･K) |
0.8 | 0.8 | 0.8 | – | – |
| Specific Heat [400℃] (kJ/kg･K) |
1.1 | 1.1 | 1.1 | – | – |
| Specific Heat [800℃] (kJ/kg･K) |
1.3 | 1.3 | 1.3 | – | – |
| Heat Shock Strength (℃) |
200 | 200 | 200 | 700 | 400 |
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