Process for the manufacture of open porous sintered bodies being prepronderantly composed of glass ceramics

US4904291A · kind A · utility

Assignee

• Schott Glaswerke · DE

Inventors

• Friedrich Siebers · Nierstein, DE
• Werner Kiefer · Ingelheim am Rhein, DE
• Maria Sura · Ingelheim am Rhein, DE

Key dates

• Filing date: Sep 19, 1988
• Grant date: Feb 27, 1990
• Expiry date: Sep 19, 2008

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C03C11/00
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

A process for manufacturing open porous sintered bodies with large open pore volume and defined pore diameters and which at least predominantly consist of glass-ceramics. They are obtained by sintering a mixture of sinterable powder and an inorganic soluble salt with defined grade of grain, the melting point of which is above the densification temperature of the sinterable powder. For the formation of a molded body the mixture of sinterable powder and inorganic salt is submitted to a molding process. The molded body is sintered in a sintering process and the soluble salt being contained in the molded body is lixiviated. As a main constituent the sinterable powder contains a pulverized crystallizable glass powder. The sintering process is performed in such a way that the crystal phases being produced during the crystallization of the crystallizable glass, and therefore the material properties, too, are controlled by the guidance of the sintering process as well as by the ion exchange taking place between the sinterable powder and the inorganic salt and which is controlled by their composition. Afterwards, the sintered body is transformed to the final glass-ceramic texture.