Background
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This Machineable Ceramic is a white ceramic which can be machined with ordinary steel or carbide tools. It has been used extensively in the Space Shuttle Orbiter. It can be used continuously up to 800°C and is a good electrical and thermal insulator. Outgassing in ultra-high vacuum environments can be eliminated, if degassed before use. MACOR® is non-wetting and can be bonded to itself as well as to various metals, if the MACOR® surfaces are first metallised.
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Key Properties
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Acids - concentrated
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Poor
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Acids - dilute
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Fair
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Alkalis
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Fair
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Dielectric constant
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5.9
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Dielectric strength ( kV.mm-1 )
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40
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Volume resistivity ( Ohm.cm )
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>1014 @ 25°C
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Compressive strength ( MPa )
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345
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Hardness - Vickers ( kgf.mm-2 )
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400
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Tensile modulus ( GPa )
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67
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Apparent porosity ( % )
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0
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Density ( g.cm-3 )
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2.52
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Coefficient of thermal expansion ( x10-6 K-1 )
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13 @ 20-1000°C
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Specific heat ( J.K-1.kg-1 )
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790 @ 25°C
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Thermal conductivity ( W.m-1.K-1 )
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1.5 @ 20°C
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Upper continuous use temperature ( °C )
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800-1000
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This entry was posted
on Thursday, April 6th, 2006 at 1:12 pm and is filed under Aircraft.
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