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Mechanical Properties of Joined Silicon Nitride
Author(s) -
JOHNSON SYLVIA M.,
ROWCLIFFE DAVID J.
Publication year - 1985
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.1151-2916.1985.tb15810.x
Subject(s) - silicon nitride , materials science , glazing , ceramic , dissolution , joint (building) , flexural strength , silicon , composite material , fracture (geology) , nitride , oxide , mechanical strength , mineralogy , metallurgy , chemistry , structural engineering , layer (electronics) , engineering
A technique is described to join Si 3 N 4 ceramics using oxide glasses. The technique involves a glazing step, followed by a pressureless reaction treatment of 30 to 60 min at 1575° to 1650°C. Reactions between the glasses and Si3N4 are reported. Important events are dissolution of Si 3 N 4 and the growth of Si 2 N 2 O crystals into the joint. The strength of joined bars depends on joint thickness. Two strength regimes are identified, and two corresponding fracture mechanisms are described. A maximum strength of ∼460 MPa is achieved for a joint thickness of ∼30 μm.