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[October 2003]
ZIRCAR Introduces New Refractory Sheet
ZIRCAR Refractory Composites Inc (Florida, NY, USA) has announced the introduction of the new Refractory Sheet Type RSLE-57. This is a low expansion, high strength, reinforced silica matrix composite. The material has been designed for use as a high strength insulator in induction hot press applications.
RSLE-57's very low thermal expansion coefficient and high hot strength combine, says the company, to give it thermal shock resistance not found in other structural ceramic matrix composite materials.
The company explained that the material exhibits a very low coefficient of expansion (0.3 x 10-6°C) which provides remarkable resistance to the thermal shock up to 1200°C in an oxidising atmosphere and permits its 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.
According to ZIRCAR, RSLE-57 also exhibits low thermal conductivity, excellent electrical insulation, high chemical purity and excellent resistance to corrosion from molten metal and glass. It is also said to exhibit exceptional non-wetting properties when used in contact with molten aluminium, making it useful in numerous molten aluminium contact applications.
RSLE-57 is 100% organic free and contains no refractory ceramic fibre. It is readily machined to precision tolerances with conventional tooling.
www.zrci.com
ENDS