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 Si3N4-to-Incoloy 909 joints and from 30–127 MPa for the Si3N4-to-Inconel 718 joints. At 500 °C the joint strength was 120 MPa while at 650°C and 950°C the joints 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 are 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.
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ASME 1993 International Gas Turbine and Aeroengine Congress and Exposition
May 24–27, 1993
Cincinnati, Ohio, USA
Conference Sponsors:
- International Gas Turbine Institute
ISBN:
978-0-7918-7892-7
PROCEEDINGS PAPER
Performance Testing and Strength Prediction of Ceramic-to-Metal Joints Free
J. H. Selverian,
J. H. Selverian
Osram Sylvania Inc., Salem, MA
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Dave A. ONeil,
Dave A. ONeil
Osram Sylvania Inc., Salem, MA
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Shinhoo Kang
Shinhoo Kang
Valenite, Troy, MI
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J. H. Selverian
Osram Sylvania Inc., Salem, MA
Dave A. ONeil
Osram Sylvania Inc., Salem, MA
Shinhoo Kang
Valenite, Troy, MI
Paper No:
93-GT-412, V03CT17A073; 10 pages
Published Online:
February 25, 2015
Citation
Selverian, JH, ONeil, DA, & Kang, S. "Performance Testing and Strength Prediction of Ceramic-to-Metal Joints." Proceedings of the ASME 1993 International Gas Turbine and Aeroengine Congress and Exposition. Volume 3C: General. Cincinnati, Ohio, USA. May 24–27, 1993. V03CT17A073. ASME. https://doi.org/10.1115/93-GT-412
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