Method of ceramic molding which produces a porosity gradient and the manufacture of compound moldings using this method

US4710480A · kind A · utility

Assignee

• Didier-Werke AG · DE

Inventors

• Rudiger Buschmann · Bärnau, DE
• Rudolf Ganz · Overath, DE
• Gerd Willmann · Niedernhausen, DE
• Ludwig Wirth · Wiesbaden, DE
• Ingo Elstner · Wiesbaden, DE
• Peter Jeschke · Eltville am Rhein, DE

Key dates

• Filing date: Dec 3, 1985
• Grant date: Dec 1, 1987
• Expiry date: Dec 3, 2005

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S264/19
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

The invention relates to a ceramic molding which is manufactured from high-temperature resistant, fire-resistant or refractory fibers and fine-grain, fire-resistant or refractory materials and, in certain cases, from other customary additives. The ceramic molding is characterized by the fact that its porosity gradually and continuously increases along an axis of the molding from less than 20% to more than 70%. The areas with low porosity comprise the fine-grain, fire-resistant or refractory materials. The areas of high porosity comprise ceramic fiber, such as, fibers of Al.sub.2 O.sub.3, SiO.sub.2, ZrO.sub.2, C, SiC or mixtures thereof. The intermediate areas are constructed of mixtures of ceramic fiber and fire-resistant or refractory materials. The invention also relates to the use of such a ceramic molding method for the manufacture of compound moldings saturated or infiltrated with organic resins, pitch, tar, metals, metal alloys or glasses.