Method for producing building materials
AssigneeIndupart Glaskeramic Stahl - Und Metallbau GmbH
InventorNorbert Greulich
Life of this patent
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Abstract
The invention relates to a process for producing high-strength construction and decoration materials which resemble natural stone, are in the form of panels and are used for cladding facades, walls and floors, both indoors and outdoors, from mixtures of broken glass, mineral components and finely divided additives, with a specified composition. A sintering aid, in the form of a solution of metal oxychlorides or metal alkoxides or tetrachlorides, preferably titanium tetrachloride, is added to the mixture, which is then introduced into a heat-resistant mould. In this mould, the mixture is subjected to a conventional sintering operation. The sintering aid which has been added makes it possible in particular to reduce the maximum sintering temperature and to improve the quality of the surface considerably.
Claims8
A process for producing a shaped sintered glass or sintered glass-ceramic body as a high-strength construction and decoration material simulating natural stone and used for cladding facades, walls and floors, both indoors and outdoors, said process comprising the steps of:
- a) introducing a planar, uniformly thick layer of a mixture comprising from 85 to 98% by weight of broken glass, from 0 to 14.7% by weight of a mineral component and from 0.3 to 5% by weight of finely divided additives into a heat-resistant mold;
- b) adding from 40 to 600 ppm of a sintering aid to the mixture, wherein said sintering aid is a solution of a metal tetrachloride compound, a metal oxychloride, a metal alkoxide, or a hydrolysis product thereof;
- c) drying the layer of the mixture in the mold at a temperature of 60 to 100° C.;
- d) heating the layer of the mixture at a rate of at least 0.5 to 3.0 K/min to a sintering temperature;
- e) maintaining the layer of the mixture at said sintering temperature for at least 20 minutes;
- and then
- f) cooling the layer of the mixture at a rate of at least 0.5 to 3.0 K/min to room temperature.
Dependencies are inferred from the claim text.