Process for permanently joining at least two structural componen

Details Process for permanently joining at least two structural componen Process for permanently joining at least two structural componen

1997-09-05

1999-08-24

Mayes, Curtis

Adhesive bonding and miscellaneous chemical manufacture

Methods

Surface bonding and/or assembly therefor

156 8925, 156813, 264682, B32B 3126

Patent

active

059420642

ABSTRACT:
A process is provided for permanently joining at least two structural components together to form a molded body, in which a carbon-containing paste is introduced between the structural components to be joined and heated to form a carbon skeleton. This skeleton is then infiltrated with silicon at a temperature above 1,410.degree. C. to form silicon carbide. As one of the structural components, a carbon fiber-reinforced component with a system of microcracks is used. One of the structural components is aligned with the other structural component in such a way as to leave a joint gap. For cases in which the width, defined as the distance between the two surfaces to be joined, is .ltoreq.80 .mu.m, the joint gap is filled with a paste which contains an organic, carbon-containing binder with a carbon content of at least 30 wt. % and carbon powder with a particle size of less than 15 .mu.m. In cases where the width of the gap is more than 80 .mu.m, carbon fibers are introduced into the joint gap in addition to the paste. The paste is pyrolyzed at a temperature in the range of 800-1,200.degree. C. to form a system of microcracks which approximately corresponds or is analogous to that of the carbon fiber-reinforced structural components. The system of microcracks of the pyrolyzed paste is then infiltrated with liquid silicon at a temperature above the melting point of silicon, which is thus converted to silicon carbide.

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Krenkel, W., Henke, T. and Mason, N., "In-Situ Joined CMC Components," Key Engineering Materials vols. 127-131, pp. 313-320, 1997.
Derwent abstract of DE 2,922,953, Dec. 1979.
Derwent abstract of DE 4,438,456, May 1996.

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