Method and components for bonding a silicon carbide molded part to another such part or to a metallic part

US4961529A · kind A · utility

Assignee

• Kernforschungsanlage Lulich Gesellschaft mit beschrankter Haftung · DE

Inventors

• Bernd Gottselig · Bensberg, DE
• Erno Gyarmati · Jülich, DE
• Aristides Naoumidis · Jülich, DE

Key dates

• Filing date: Dec 20, 1988
• Grant date: Oct 9, 1990
• Expiry date: Dec 20, 2008

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/266
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

A layer of titanium carbosilicide Ti.sub.3 SiC.sub.2 on a silicon carbide surface polished for making a joint makes it possible to join silicon carbide bodies together in a hot pressing procedure and obtaining a joint strength comparable to the strength of the silicon carbide material. Such a layer on silicon carbide also makes possible brazed juoints with steel alloy or nickel based alloy parts. The layer may be applied directly by a powder dispersion in a volatile but viscous glycol or by sputtering or else the layer can be made in place from a powder mixture of components, especially TiC.sub.0,8 and Tisi.sub.2 (5:1) or a titanium layer of a thickness in the range of 1 to 3 .mu.m that reacts with the silicon carbide surface. When silicon carbide parts are joined together, the heating up to make the joint also serves to convert a titanium layer into titanium carbosilicide. When silicon carbide is to be joined with metal, a preliminary heating step is necessary to at first convert a powder mixture or a titanium layer on the silicon carbide surface to Ti.sub.3 SiC.sub.2. Alternatively a Ti.sub.3 SiC.sub. 2 surface layer can be formed by a sputtering process. The Ti.sub.3 SiC.sub.2 l…