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Evaluation of Brazed Silicon Nitride Joints: Microstructure and Mechanical Properties
Author(s) -
Peteves Stathis D.,
Nicholas Michael G.
Publication year - 1996
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1996.tb08764.x
Subject(s) - brazing , materials science , weibull modulus , ceramic , microstructure , silicon nitride , composite material , flexural strength , thermal expansion , layer (electronics) , weibull distribution , metallurgy , alloy , statistics , mathematics
Sintered Si 3 N 4 has been bonded to itself and to AISI 316 steel by the active‐metal brazing route. A commercial Ag‐35Cu‐1.6Ti filler has been used with joining taking place during a 30 min hold at 850°C under vacuum. Si 3 N 4 / Si 3 N 4 joints have been produced with strength distribution (average bend strength = 773.5 MPa, Weibull modulus = 11.2) similar to that of the monolithic ceramic. Direct brazing of the Si 3 N 4 to AISI 316 steel was unsuccessful. However, reliably strong (bend strength of 250–400 MPa) ceramic/ steel joints with 20 × 20 mm 2 cross sections were fabricated by using Cu, Mo, or Nb interlayers. The most potent inter‐layer used in this work was Mo, whose coefficient of thermal expansion matches best that of the ceramic.