Performance testing and strength prediction of ceramic-to-metal joints
- Osram Sylvania Inc., Salem, MA (United States)
- Valenite, Troy, MI (United States)
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 Si[sub 3]N[sub 4]-to-Incoloy 909 joints and from 30--127 MPa for the Si[sub 3]N[sub 4]-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 (FA) and a probabilistic failure theory (CARES) were used to predict the 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.
- OSTI ID:
- 6955334
- Journal Information:
- Journal of Engineering for Gas Turbines and Power; (United States), Vol. 116:3; ISSN 0742-4795
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
BRAZED JOINTS
PERFORMANCE TESTING
INCOLOY ALLOYS
BONDING
INCONEL 718
SILICON NITRIDES
MECHANICAL PROPERTIES
ALLOY-NI53CR19FE19NB5MO3
ALLOYS
ALUMINIUM ADDITIONS
ALUMINIUM ALLOYS
CHROMIUM ALLOYS
CORROSION RESISTANT ALLOYS
FABRICATION
HEAT RESISTANT MATERIALS
HEAT RESISTING ALLOYS
INCONEL ALLOYS
IRON ALLOYS
JOINING
JOINTS
MATERIALS
MOLYBDENUM ALLOYS
NICKEL ALLOYS
NICKEL BASE ALLOYS
NIOBIUM A
NITRIDES
NITROGEN COMPOUNDS
PNICTIDES
SILICON COMPOUNDS
TESTING
WELDED JOINTS
360603* - Materials- Properties
360201 - Ceramics
Cermets
& Refractories- Preparation & Fabrication
360101 - Metals & Alloys- Preparation & Fabrication