Machinable Alumina Al2O3
Final Advanced Materials provides machinable ceramics. Cotronics machinable alumina Al2O3 is available in boards and rods, we can machine according to drawings
Machinable alumina presentation
Cotronics Rescor 960 is a 96% Alumina, Machinable Ceramic that is usable to 1650°C. It is manufactured from high purity alumina by a unique process.
Machining can be accomplished with conventional tooling on standard shop equipment. No heat treatment is required.
Rescor 960 Machinable Alumina can be used continuously to temperatures of 1650°C and offers the convenience and economy of an in house capability for Alumina parts.
The chemical, thermal and electrical properties of Rescor 960 is equivalent to standard high alumina ceramics.
Machinable alumina applications
Rescor 960 is ideal for applications in electrical, electronic, metallurgical, fixtures and vacuum industries.
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Properties |
Units |
Alumina silicate raw |
Alumina silicate 1100°C |
Alumina silicate 1300°C |
Macor® |
Glass ceramic (Vitro 800) |
Machinable alumina |
Machinable boron nitride |
Aluminium nitride (Shapal M™) |
Machinable Aluminium nitride |
|
Physical characteristics |
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|
Density |
g/cm3 |
2.2 |
2.4 |
2.5 |
2.52 |
2.7 |
3.8 |
1.85 |
2.9 |
2.9 |
|
Porosity |
% |
1.5 - 2 |
0 - 0.5 |
0 - 0.5 |
0 |
0.096 |
10 |
14 |
0 |
< 0,1 |
|
Water uptake |
% |
1.5 - 2 |
0 - 0.5 |
0 - 0.5 |
0 |
0.038 |
2 - 3.5 |
/ |
0 |
0 |
|
Mechanical characteristics |
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|
Hardness |
Mohs: 2.5 |
Mohs: 5.5 |
Mohs: 7.5 |
Rockwell A: 48 |
Mohs: 4 |
Mohs: 5 |
Knopp: 4 kg/mm² |
Vickers: 3900 Mpa |
Vickers: 3750 Mpa |
|
|
Compressive Strength |
N/mm2 |
6 |
150 |
800 |
345 |
488 |
422 |
20 |
1200 |
1170 |
|
Flexural Strength |
N/mm2 |
12 |
50 |
80 |
94 |
108 |
267 |
50 |
300 |
300 |
|
Modulus of Elasticity |
GPa |
/ |
/ |
/ |
66.9 |
65 |
/ |
/ |
190 |
180 |
|
Thermal characteristics |
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|
Peak Temperature |
°C |
900 |
1100 |
1400 |
1000 |
800 |
1650 |
850 |
1000 |
1000 |
|
Continuous Temperature |
°C |
700 |
1100 |
1300 |
800 |
800 |
1650 |
850 |
1000 |
1000 |
|
Specific Heat at 20°C |
J/kg°K |
/ |
/ |
/ |
0.79 |
/ |
/ |
1.5 |
/ |
/ |
|
Thermal Conductivity at 100°C |
W/m°K |
1.07 |
1.7 |
2.2 |
1.46 |
1.68 |
4.61 |
90 |
90 |
90 |
|
Coefficient of Expansion 20 - 40°C |
10-6/°K |
/ |
/ |
/ |
9.3 |
/ |
/ |
/ |
4.4 |
/ |
|
20 - 600°C |
/ |
2.9 - 3.6 |
6-8 |
11.4 |
8,6 |
/ |
/ |
4.8 |
4.5 |
|
|
20 - 800°C |
/ |
/ |
/ |
12.6 |
/ |
/ |
/ |
5.1 |
/ |
|
|
20 - 1000°C |
7-12 |
/ |
4-10 |
/ |
/ |
/ |
0.57 |
/ |
/ |
|
|
Electrical characteristics |
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|
Specific Resistivity at 20°C |
Ohm.cm |
1010 |
1012 |
1012 |
1016 |
1.8x1014 |
1014 |
1014 |
1012 |
1012 |
|
Dielectric Constant at 20°C |
at 1 KHz |
/ |
/ |
6.1 |
6.03 |
6~7 |
9 (@ 100kHz) |
4 |
7.1 |
7.1 |
|
Loss Tangent |
at 1 KHz |
/ |
/ |
9x10-5 |
0.005 |
/ |
/ |
0.0012 |
0.001 |
/ |
|
Dielectric Strength at 20°C |
kV/mm |
8-10 |
6-7 |
12-17 |
40 |
> 15 |
7.87 |
2 |
40 |
40 |
|
Chemical characteristics |
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|
Corrosion resistance at 20°C |
B |
B |
B |
B |
B |
B |
/ |
/ |
/ |
|
|
Resistance to alkalis at 20°C |
B |
B |
B |
TB |
TB |
B |
/ |
/ |
/ |
|