Joining of silicon carbide with a cordierite glass-ceramic

Journal Article · Mon Feb 01 04:00:00 EST 1999 · Journal of the American Ceramic Society

DOI:https://doi.org/10.1111/j.1551-2916.1999.tb20061.x· OSTI ID:329093

Perham, T J; De Jonghe, L C ^[1]; MoberlyChan, W J ^[1]

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1. Lawrence Berkeley National Lab., CA (United States)

A method for the joining of silicon carbide using a cordierite glass-ceramic has been developed. Cordierite, with glass-ceramic processing, remains amorphous and wets the SiC substrate to form a strong bond when rapidly fired. Subsequent heat treatment crystallizes a multiphase interlayer with a matching bulk thermal expansion coefficient (CTE). A benchtop tape casting method for depositing joining precursor films of varying thickness is described. The wetting characteristics of cordierite on SiC that are pertinent to the joining process are shown to be highly sensitive to processing atmosphere. Doping with a fluoride ion flux can lower the peak processing temperature without significantly altering the crystallization path. The effect of interlayer thickness is observed by monitoring indentation crack paths and with 4-point bending tests. Controlling the degree of crystallinity is shown to tailor the mismatches in thermal expansion coefficient and elastic moduli to produce joints of high strength ({sigma}{sub F} > 500 MPa). Characterization is accomplished with XRD, SEM, and TEM.

• Sponsoring Organization: USDOE Office of Energy Research, Washington, DC (United States)
• DOE Contract Number: AC03-76SF00098
• OSTI ID: 329093
• Journal Information: Journal of the American Ceramic Society, Journal Name: Journal of the American Ceramic Society Journal Issue: 2 Vol. 82; ISSN 0002-7820; ISSN JACTAW
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM OXIDES
CERAMICS
GLASS
HEAT TREATMENTS
INTERFACES
JOINING
MAGNESIUM OXIDES
SILICON CARBIDES
SILICON OXIDES
THERMAL EXPANSION