Sintered shaped body, whose surface comprises a porous layer and a method for the production thereof

US7074479B2 · kind B2 · utility

Assignee

• Ceramtec AG, Innovative Ceramic Engineering · DE

Inventors

• Dirk Rogowski · Amöneburg, DE
• Hans-Georg Pfaff · Esslingen am Neckar, DE
• Alwin Nagel · Aalen, DE

Key dates

• Filing date: Mar 14, 2001
• Grant date: Jul 11, 2006
• Expiry date: Mar 14, 2021

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/265
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

Porous coatings on high-performance ceramics attempt to combine the mechanical and thermal characteristics, which fulfil stringent demands, of the substrate material with the advantageous properties of coating materials. The subsequent application of layers of this type to the pre-sintered substrate produces unsatisfactory results in several areas of use with regard to possible layer thickness, porosity and adhesion. According to the invention, a shaped body consisting of a sintered, inorganic material, whose surface comprises a porous layer is produced in such a way that the base body is first formed as a green body. A layer in the form of a suspension, also containing an inorganic material, is then applied to the surface or to one section of the surface of the base body. A predetermined fraction of a pore-forming substance is mixed with at least the material of said layer and the green body with its applied layer is subjected to the thermal treatments required for producing a monolithic sintered body.