Ceramic-metal brazing for high temperature applications
- and others
Next-generation advanced heat engine designs will require joining of ceramic parts to metal subassemblies. Engine materials are expected to experience extreme thermal operating conditions. Sandia National Laboratories/New Mexico has been investigating the direct brazing of silicon nitride to a variety of metals with brazing alloys that contain titanium. The `reactive` Ti constituent reacts with Si{sub 3}N{sub 4} to form titanium nitrides and silicides at the ceramic and braze interface. Two Si{sub 3}N{sub 4} ceramics, four metals, and two brazing alloys were selected for the investigation. The Si{sub 3}N{sub 4} compositions contained either 8 wt% magnesia, alumina, and yttria or 10 wt% yttria and strontia sintering additions. Solid-state aging studies were designed to simulate isothermal operating conditions of a heat engine. Microstructural evolution of the metal (or ceramic)-braze interface and the bulk braze will be discussed. Mechanical test braze joints are also being fabricated to characterize representative joint microstructures. Initial four-point bend (flexure) tests will be conducted at room temperature.
- Research Organization:
- Sandia National Laboratory
- DOE Contract Number:
- AC04-94AL85000
- OSTI ID:
- 115513
- Report Number(s):
- CONF-9404233--
- Country of Publication:
- United States
- Language:
- English
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