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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 melt

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.

대표청구항 ▼

A process for them manufacture of open porous sintered bodies at least predominantly consisting of glass ceramics comprising the steps of: (a) mixing a sinterable powder with a ground crystallizable glass powder to form a main constituent, the sinterable powder comprising a ground solder glass havin

A process for them manufacture of open porous sintered bodies at least predominantly consisting of glass ceramics comprising the steps of: (a) mixing a sinterable powder with a ground crystallizable glass powder to form a main constituent, the sinterable powder comprising a ground solder glass having a viscosity which si below the viscosity of the crystallizable glass powder when heated to a sintering temperature (b) adding to the main constituent an inorganic salt of defined grain size to form a molding material, the melting point of the salt being above the densification temperature of the sinterable powder, (c) submitting the molding material to a molding process for the formation of a molded body, (d) sintering the molded body in a sintering process to form a sintered body, the salt and sinterable powder being selected such that an ion exchange occurs between the salt and the sinterable powder during the sintering process, (e) cooling the sintered body, (f) leaching the salt contained in the sintered body to form pores within the body, and (g) transforming the sintered body into a final glass-ceramic body having open pores.