Brazing of titanium-vapor-coated silicon nitride

Journal Article · Thu Sep 01 00:00:00 EDT 1988 · Advanced Ceramic Materials; (USA)

DOI:https://doi.org/10.1111/j.1551-2916.1988.tb00256.x· OSTI ID:5965166

Santella, M L ^[1]

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1. Oak Ridge National Lab., TN (USA)

A technique for brazing Si{sub 3}N{sub 4} with metallic alloys was evaluated. The process involved vapor coating the ceramic with a 1.0-{mu}-thick layer of titanium before the brazing operation. The coating improved wetting of the Si{sub 3}N{sub 4} surfaces to the extent that strong bonding between the solidified braze filler metal and the ceramic occurred. Braze joints of Si{sub 3}N{sub 4} were made with Ag-Cu, Au-Ni, and Au-Ni-Pd alloys at temperatures of 790{degree}, 970{degree}, and 1,130{degree}C. Silicon nitride specimens were also brazed with a Ag-Cu alloy to the molybdenum alloy TZM, titanium, and A286 steel at 790{degree}C. Residual stresses resulting from mismatch of thermal expansion coefficients between the Si{sub 3}N{sub 4} and the metals caused all of the ceramic-to-metal joints to spontaneously crack in the Si{sub 3}N{sub 4} upon cooling from the brazing temperature.

• DOE Contract Number: AC05-84OR21400
• OSTI ID: 5965166
• Journal Information: Advanced Ceramic Materials; (USA), Journal Name: Advanced Ceramic Materials; (USA) Vol. 3:5; ISSN 0883-5551; ISSN ACEME
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360201* -- Ceramics
Cermets
& Refractories-- Preparation & Fabrication
BRAZING
COATINGS
DATA
ELEMENTS
EXPERIMENTAL DATA
FABRICATION
INFORMATION
JOINING
METALS
NITRIDES
NITROGEN COMPOUNDS
NUMERICAL DATA
PNICTIDES
RESIDUAL STRESSES
SILICON COMPOUNDS
SILICON NITRIDES
STRESSES
TITANIUM
TRANSITION ELEMENTS
VAPOR DEPOSITED COATINGS
VERY HIGH TEMPERATURE
WELDING