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RESEARCH PAPERS: Gas Turbines: Manufacturing and Materials

Performance Testing and Strength Prediction of Ceramic-to-Metal Joints

[+] Author and Article Information
J. H. Selverian, D. A. O’Neil

Osram Sylvania Inc., 60 Boston Street, Salem, MA 01970

S. Kang

Valenite, 1711 Thunderbird, Troy, MI 48084

J. Eng. Gas Turbines Power 116(3), 622-628 (Jul 01, 1994) (7 pages) doi:10.1115/1.2906865 History: Received March 01, 1993; Online April 24, 2008

Abstract

Brazed joints were made between silicon nitride and Ni-based and Fe-based super alloys. Room temperature shear (torsion) strengths ranged from 75-242 MPa for Si3 N4 -to-Incoloy 909 joints and from 30-127 MPa for the Si3 N4 -to-Inconel 718 joints. At 500°C the joint strength was 120 MPa while at 650°C and 950°C the joint strengths were less than 20 MPa. These low strengths at 650°C and 950°C were attributed to a reduction in the shrink-fit and to low braze strength at these high temperatures. Finite element analysis (FEA) and a probabilistic failure theory (CARES) were used to predict the joint strengths. The predicted joint strengths agreed well with measured joint strengths in torsional loading at 20°C. Torsion tests were also performed at 650°C. Aspects of the material systems, residual stresses, mechanical behavior, and strength predictions and presented. Two new braze alloys based on the Au-Ni-Cr-Fe system were used to overcome the poor high-temperature strength. Joints made with these brazes had good strength (85 MPa and 35 N-m) at 650°C.

Copyright © 1994 by The American Society of Mechanical Engineers
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