Fire-proof material

Abstract

The heat-resistant and refractory molded part in the form of an artificial log for fireplaces, a heat-insulating plate or a light-weight constructional brick having a density of from 400 to 1000 kg/m 3 consists of hydraulically cured compositions, wherein the uncured composition contains from 10 to 60% by weight of aluminous cement and from 10 to 60% by weight of xonotlite in addition to water.

1 . A heat-resistant and refractory molded part in the form of an artificial log for fireplaces, a heat-insulating plate or a light-weight constructional brick having a density of from 400 to 1000 kg/m 3  consisting of hydraulically cured compositions, wherein the uncured composition contains from 10 to 60% by weight of aluminous cement and from 10 to 60% by weight of xonotlite in addition to water.  
     
     
         2 . The molded part according to  claim 1 , characterized in that said composition contains from 20 to 40% by weight of aluminous cement and from 20 to 40% by weight of synthetic xonotlite.  
     
     
         3 . The molded part according to  claim 1 , characterized by containing wollastonite, tobermorite, finely divided amorphous silica and/or reactive aluminum oxide as fillers.  
     
     
         4 . The molded part according to  claim 1 , characterized by containing light-weight fillers selected from the group consisting of pearlites, vermiculites, fly ashes and/or glass beads.  
     
     
         5 . A method for the preparation of a heat-resistant and refractory molded part according to  claim 1 , characterized in that a mixture of aluminous cement, optionally in admixture with Portland cement, phosphate binders or water glass, fillers and, if desired, fibers, curing accelerators, curing delayers, plasticizing agents and foaming agents, is mixed with water, the composition is molded and cured, wherein the uncured composition contains from 10 to 60% by weight of aluminous cement and from 10 to 60% by weight of xonotlite.  
     
     
         6 . The method according to  claim 5  for the preparation of an artificial log for fireplaces, characterized in that the uncured composition is placed into a mold which corresponds to the shape of natural logs.  
     
     
         7 . The method according to  claim 6 , characterized in that either the composition is colored with refractory pigments, or else the ready-cured log is colored later externally with refractory pigment paints.  
     
     
         8 . Use of an hydraulically cured composition containing, in an uncured state, in addition to water, aluminous cement, optionally in admixture with Portland cement, phosphate binders or water glass, fillers and, if desired, fibers, curing accelerators, curing delayers, plasticizing agents and foaming agents, wherein the uncured composition contains from 10 to 60% by weight of aluminous cement and from 10 to 60% by weight of xonotlite, for the preparation of a molded part according to  claim 1.