Joining of silicon carbide reinforced ceramics
This research program will identify and develop techniques for joining silicon carbide fiber-reinforced ceramic composites of tubular geometries, primarily through the use of glass joining materials. The general tasks include: identifying, preparing, and characterizing glass compositions suitable for joining ceramic/ceramic composites; developing a joining methodology and evaluating the effects of process parameters on joint characteristics; fabricating and characterizing joints; and determining physical/mechanical properties and failure behavior of joints under ambient conditions, elevated temperatures, and simulated service environments. The majority of the effort during the last year has been directed towards characterization of glass compositions for use as joining materials. The following requirements for the glass brazing material were identified: the glass joining material should melt and flow at temperatures below those reported to degrade the properties of the composite material (approximately 1200/sup 0/C); the glass joining material should not exhibit excessive chemical reactivity with SiC; ideally, the devitrified glass joint should exhibit good mechanical properties to 1000/sup 0/C; and the glass composition should devitrify to crystalline phases which exhibit low thermal expansion and good chemical resistivity to promote thermal and chemical stability of the resulting joint. This review discusses the results of characterization studies of candidate joining glasses with respect to the above criteria. Also discussed are the results of some initial joining experiments. 6 refs., 19 figs., 5 tabs.
- Research Organization:
- EG and G Idaho, Inc., Idaho Falls (USA)
- DOE Contract Number:
- AC07-76ID01570
- OSTI ID:
- 6096931
- Report Number(s):
- EGG-M-15687; CONF-8705103-12; ON: DE87014881
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360201* -- Ceramics
Cermets
& Refractories-- Preparation & Fabrication
CARBIDES
CARBON COMPOUNDS
CERAMICS
CHEMICAL COMPOSITION
COHERENT SCATTERING
CRYSTALLIZATION
DIFFRACTION
FABRICATION
GLASS
JOINING
JOINTS
MATERIALS
MELTING POINTS
PHASE TRANSFORMATIONS
PHYSICAL PROPERTIES
REINFORCED MATERIALS
SCATTERING
SILICON CARBIDES
SILICON COMPOUNDS
THERMODYNAMIC PROPERTIES
TRANSITION TEMPERATURE
WETTABILITY
X-RAY DIFFRACTION