Method of making porous mono cordiertie glass ceramic material and its use

Abstract

A sintered porous cordierite-based glass-ceramic material is made using mainly three natural starting materials which are silica′ sand, kaolin clay and magnesite in addition to little boric acid is described. Upon melting at 1400-1450° C., this combination of raw materials and boric acid forms transparent brown glass which after solidification by quenching is then crushed and reduced to powder having a median particle size diameter less than 65 microns. This brown glass powder is consolidated, for example by compaction, to form a green body for sintering. Sintering of the green body at temperatures between about 1000° C. and 1300° C. in the period from 1 min to 60 min to produce porous cordierite glass-ceramic material containing a 56% porosity. The said material have density, microhardness and CTE suitable for use in various technical fields such as light insulation refractor material and in filter for vehicle exhaust.

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