TECHNICAL PAPERS: Gas Turbines: Ceramics

Design, Fabrication, and Testing of Ceramic Joints for High Temperature SiC/SiC Composites

[+] Author and Article Information
M. Singh

Dynacs Engineering Co. NASA Glenn Research Center Cleveland, OH 44135

E. Lara-Curzio

Metals and Ceramics Division Oak Ridge National Laboratory Oak Ridge, TN 37831

J. Eng. Gas Turbines Power 123(2), 288-292 (Oct 01, 2000) (5 pages) doi:10.1115/1.1362664 History: Received October 01, 1999; Revised October 01, 2000
Copyright © 2001 by ASME
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Photograph showing components fabricated by joining fiber-reinforced silicon carbide matrix composite subelements
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Schematic of a joint design map where the shear and normal stresses have been normalized by the virgin isothermal joint strengths. The envelope defines the strength of the joint.
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Schematic of tubes joined to a manifold where stresses in the joint regions involve multiaxial states of stress. (e.g., normal plus shear stresses).
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Schematic of a joint design map where the design envelope shrinks due to a degradation of strength with time
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Schematic of the double-notched shear specimen
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Schematic of the process for joining of fiber-reinforced silicon carbide matrix composites
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Schematic of fixture used for the compression of double-notched specimens at elevated temperatures
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(a) and (b) Photographs of double-notched joint specimens
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Typical shear stress versus cross-head displacement curves obtained from the compression of double-notched joint specimens at high temperatures
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Optical micrograph of fracture surfaces of joined CVI SiC/SiC composites tested at 1200°C
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Temperature dependence of apparent shear strength for joined SiC (CG-Nicalon™)/C/CVI-SiC composites
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Results from the shear stress-rupture evaluation of joints at 1200°C. The data point at the shortest time corresponds to the “virgin” shear strength of the joints.




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