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US 4,906,509 AGranted
Two layered refractory plate
AssigneeShinagawa Refractories Co., Ltd.
InventorsHideaki Nishio, Akira Matsuo, Katsunori Ito, Keisuke Uemori
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Abstract
The present invention provides a two layered refractory plate consisting of a crack-resistant substrate with a grained surface layer embedded thereon. This two layered refractory plate is suitable for use as a shelf plate in a furnace in which the temperatures vary. Cracks due to thermal expansion differences in the material can be prevented.
Claims1
A two layered refractory plate, which consists of:
- a substrate formed of at least one material selected from the group consisting of magnesia, spinel, mullite, zirconia, zircon, alumina, chamotte, cordierite, silicon carbide and silicon nitride having thereon a granular surface composed of grains of a refractory material, which grains are spaced apart from each other thereby leaving gaps between said grains, said grains at least partially being embedded in said substrate and being formed of a material selected from the group consisting of magnesia, spinel, zirconia, alumina, silica, chromium oxide, silicon carbide, silicon nitride, carbon and picrochromite.
Dependencies are inferred from the claim text.