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[November 2002]
Refractory Sheet for High Strength Insulation
Zircar Refractory Composites Inc (Florida, NY, USA) has launched its refractory sheet Type RSLE-57, described as a low expansion, high strength reinforced silica matrix composite designed for use as a high strength insulator in induction hot press applications.ZRCI says that the product's very low thermal expansion coefficient and high hot strength combine to give it a thermal shock resistance not found in other structural ceramic matrix composite materials.
The coefficient of expansion is 0.3 x 10-6°C, providing resistance to thermal shock up to 1200°C in an oxidising atmosphere and permitting use with rapid variation in temperature in that zone.
Beyond 1200°C, it transforms into a crystalline structure while maintaining its properties up to 1650°C providing that there is no significant fall in temperature. At temperatures above this, the material will exhibit surface glazing. Other unique properties claimed for RSLE-57 are:
• A low thermal conductivity
• An excellent electrical insulation
• A high chemical purity
• An excellent resistance to corrosion (from molten metal and glass)ZRCI adds that the material also exhibits exceptional non-wetting properties when used in contact with molten aluminium, making it useful in numerous molten aluminium contact applications.
The material is 100% organic free and contains no refractory ceramic fibre. It is readily machined to precision tolerances with conventional tooling.
ENDS