Jan 6 2004
Shapal-M® is a high purity, machineable ceramic with high strength and high thermal conductivity. Although the thermal conductivity is not as high as Aluminium Nitride, it is still 50 times that of Machineable Glass Ceramic.
Like Aluminium Nitride, applications include heat sinks and electronically insulating components for the high power electronic industry, and crucibles for molten metals.
Shapal-M® also has the advantage that much more complex shapes may be used. It may be machined by using carbide tools and is resistant to acids and bases.
Key Properties
The key properties of Shapal-M are tabulated below.
Table 1. Key properties of Shapal-M
| Chemical Resistance |
| Acids - dilute |
Fair |
| Alkalis |
Poor |
| Electrical Properties |
| Dielectric constant |
7.3 |
| Dielectric strength ( kV.mm-1 ) |
40 |
| Volume resistivity ( Ohm.cm ) |
1.8 x 1013 @ 25 °C |
| Mechanical Properties |
| Compressive strength ( MPa ) |
1000 |
| Hardness - Vickers ( kgf.mm-2 ) |
560 |
| Tensile modulus ( GPa ) |
160 |
| Physical Properties |
| Apparent porosity ( % ) |
0 |
| Density ( g.cm-3 ) |
2.95 |
| Thermal Properties |
| Coefficient of thermal expansion ( x10-6 K-1 ) |
5.2 @ 20-1000 °C |
| Thermal conductivity ( W.m-1.K-1 ) |
100 @ 20 °C |
| Upper continuous use temperature ( °C ) |
1000 - 1900 |
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