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For MARUWA ceramic valves, high performance and high reliability are realized by means of our original material technology, press technology , and high-precision processing technology developed over many years. Sliding parts other than valves are available through our surface polishing technology.
The sliding properties can be further improved by applying carbon coating developed by our company.
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■Features
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High strength, resistance against wear
Excellent in resistance against wear, and hardness second to diamond. |
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Thermal conductivity, heat resistance, thermal shock resistance
High thermal conductivity, excellent in heat resistance/ thermal shock resistance. |
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Chemical resistance
Excellent resistance against chemicals not to be damaged by acid and alkali. |
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■Application
• Faucet valve
• Sliding parts
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■Characteristics
| Material name |
Alumina (Al2O3) |
| Product No. |
AP960 |
AP90T |
| Coloration |
White |
Greenish white |
| Alumina purity |
% |
96 |
90 |
| Apparent density |
kg/m3 |
3.7x103 |
3.7x103 |
| Water absorption |
% |
0 |
0 |
Mechanical
characteristics |
Vickers hardness |
GPa |
15.7 |
13.7 |
| Bending strength |
MPa |
313 |
294 |
| Compressive strength |
MPa |
1964 |
- |
Thermal
characteristics |
Coefficient of
linear expansion |
40~400ºC x10-6/ºC |
7.3 |
6.2 |
| Thermal conductivity |
25ºC cal•cm
/cm2•sec•ºC |
0.04 |
0.03 |
| Specific heat |
J / (kg • K) |
0.75x103 |
0.75x103 |
| Thermal shock resistance |
ºC |
200 |
200 |
Electrical
characteristics |
Dielectric strength |
kV/mm |
10 |
10 |
| Volume resistivity |
20ºC |
Ω • cm |
1014 |
- |
| 300ºC |
1013 |
- |
| 500ºC |
1010 |
- |
| Dielectric constant |
1MHz |
9.4 |
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COPYRIGHT 2009 MARUWA Co., Ltd. ALL RIGHT RESERVED.
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