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Application filed by Nauchnoizsledovatelski Inst StfiledCriticalNauchnoizsledovatelski Inst St
Priority to BG9046089ApriorityCriticalpatent/BG49649A1/en
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The fire-clay is used for preparation of goods, in particular, of fire-resistant glasses. It has a high thermal resistance and strength, while their production allows the utilization of the waste refractory. The fire-clay device contains in %: a highallumooxide waste refractory from 60 to 80, kaolin from 10 to 20 and fire-resistant clay from 10 to 20. The high allumooxide refractory may partially be replaced with refractory class A to 50%, while their grain-metric composition is the following: grain size is between 0.5 mm - 50% and from 1 to 2 mm - 50%.
BG9046089A1989-11-281989-11-28Refrectory for manifacture of products for metal- founding
BG49649A1
(en)
Process for the production of heat and wear-resistant ceramic materials, product of the process and starting material composition for use in the process
Process for the preparation of reaction-sintered composite materials containing boron nitride and for the production of shaped articles from these composite materials, and composite materials which contain boron nitride and can be prepared by the process