Fine ceramics have different characteristics such as those excellent in heat resistance, those with excellent wear resistance, those excellent in chemical resistance, those with excellent electrical insulating properties, and those with excellent thermal conductivity, therefore, it is important to select the material according to the required characteristics.
The features and properties of the major fine ceramics are as follows;
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| Classification | Engineering Ceramics | Machinable Ceramics | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Code | Type E-1 |
Type E-2 |
Type E-3 |
Type E-4 |
Type E-5 |
Type M-1 |
Type M-2 |
Type M-3 |
||
| Material | Alumina | Zirconia | Silicon Nitride | Silicon Carbide | Aluminum Nitride | Machinable Ceramics | Boron Nitride | Aluminum Nitride | ||
| Main component / Composition | Al2O3 99.5% | ZrO2 | Si3N4 | SiC | AlN | Fluorphlogopite | BN | AlN | ||
| General Properties |
Color | ivory | white | gray | black | gray | white | white | light gray | |
| Specific Gravity | ｇ/㎝3 | 3.9 | 6.0 | 3.2 | 3.1 | 3.2 | 2.6 | 2.0 | 2.9 | |
| Water Absorption Ratio | ％ | 0 | 0 | 0 | 0 | 0 | 0 | 0.4 | 0 | |
| Thermal Properties |
Max. Useable Temperature | ℃ | 1500 | 1200 | 1600 | 1000 | 1000 | 2200 non-oxidative atmosphere |
1900 non-oxidative atmosphere |
|
| Thermal Shock Resistance | ℃ | 200 | 250 | 700 | 400 | 400 | 150 | 1500 | 400 | |
| Thermal Conductivity （25℃） |
W/m・k | 30 | 3 | 25 | 75 | 170 | 1.7 | 36 | 90 | |
| Thermal Conductivity （400℃） |
W/m・k | 13 | 3 | 80 | ||||||
| Thermal Conductivity （800℃） |
W/m・k | 9 | 3 | 50 | ||||||
| Thermal Expansion Coefficient （25～200℃） |
1/℃ × 10-6 |
6.5 | 9.5 | 4.5 | ||||||
| Thermal Expansion Coefficient （25～400℃） |
1/℃ × 10-6 |
7.0 | 10.0 | 8.5 | 4.4 | |||||
| Thermal Expansion Coefficient （25～600℃） |
1/℃ × 10-6 |
7.5 | 10.3 | 4.8 | ||||||
| Thermal Expansion Coefficient （25～800℃） |
1/℃ × 10-6 |
7.9 | 10.3 | 3.2 | 3.2 | 5.1 | ||||
| Mechanical Properties |
Flexural Strength | MPa | 340 | 1100 | 880 | 490 | 350 | 147 | 35 | 290 |
| Compressive Strength | MPa | 2900 | 3000 | 2940 | 3000 | 50 | 1180 | |||
| Young’s Modulus | GPa | 350 | 210 | 290 | 390 | 320 | 66 | 180 | ||
| Hardness(Vickers) | GPa | 15 | 13 | 16 | 20 | 11 | 2.2 | 3.9 | ||
| Electrical Properties |
Volume Resistivity （25℃） |
Ω・㎝ | 1×1015 | 0.8×1012 | 1×1014 | 3×106 | 0.1×1015 | 1.8×1015 | 10×1015 | 20×1012 |
| Volume Resistivity （300℃） |
Ω・㎝ | 1×1013 | ||||||||
| Volume Resistivity （500℃） |
Ω・㎝ | 1×1010 | 30×106 | |||||||
| Volume Resistivity （800℃） |
Ω・㎝ | 1×109 | ||||||||
| Dielectric Breakdown Voltage | KV/㎜ | ＞10 | 15 | 18 | 40 | |||||
| Dielectric Constant | 1MHz | 10 | 8.3 | 8.8 | 6.1 | 4 | 7 | |||
| Dielectric Tangent | 1MHz | 0.0004 | 0.0005 | 0.0008 | 0.001 | |||||
| Main Characteristic | Well balanced with wear resistance, heat resistance, chemical resistance, mechanical strength, and electrical insulation. | Highest toughness and strength at room temperature of all fine ceramics. Wear resistance. |
Excellent thermal shock strength. Inactive against melted metal. |
Wear resistance. Heat resistance. Chemical resistance. High mechanical strength under high temperatures. |
High thermal conductivity. | Excellent machinability. Rapid delivery. Heat insulation(thermal insulation) . |
Heat resistance. Thermal shock strength. High thermal conductivity. |
High thermal conductivity. | ||
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Fine Ceramics other than the above can also be supplied.
Listed values are measured, it is not a guaranteed value.
Max. useable temperature is for reference only, and varies depending on the operating conditions.