SPARK PLASMA SINTERING OF CERAMIC MATRIX COMPOSITES WITH SELF-HEALING MATRIX

A mixture of Si3N4 and TiB2, with Al2O3 and Y2O3 as sintering aids, was ball milled, dried and spark plasma sintered under an axial pressure of 30 MPa in an argon or nitrogen atmosphere to temperatures in the range 1450-1750 C, with a hold time at top temperature of 1-20 min. The sintered materials...

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Bibliographic Details
Published inCeramic Engineering and Science Proceedings pp. 177 - 186
Main Authors Magnant, J, Maille, L, Pailler, R, Guette, A
Format Journal Article
LanguageEnglish
Published 01.01.2015
Subjects
Barometric pressure
Ceramics
Preforms
Self healing materials
Silicon nitride
Sintering
Spark plasma sintering
Titanium diboride
Yttrium oxide
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ISBN1119031184
9781119031185
ISSN0196-6219

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Summary:A mixture of Si3N4 and TiB2, with Al2O3 and Y2O3 as sintering aids, was ball milled, dried and spark plasma sintered under an axial pressure of 30 MPa in an argon or nitrogen atmosphere to temperatures in the range 1450-1750 C, with a hold time at top temperature of 1-20 min. The sintered materials were characterised by determinations of bulk density and phase composition. A pyrolytic carbon coating was deposited on multi-direction carbon fibre preforms by CVI, and composites prepared by slurry infiltration of the preforms using a mixture of Si3N4, TiB2, Al2O3 and Y2O3 followed by spark plasma sintering at 1500 C, hold time 3 min, under an axial pressure of 30 MPa in a nitrogen atmosphere. This firing cycle gave full matrix consolidation without fibre degradation. A flexural strength of approximately 300 MPa was achieved, and the composites exhibited self-healing behaviour on oxidation in air at 850 C for 13 h.
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ISBN:1119031184
9781119031185
ISSN:0196-6219