C - Chemistry – Metallurgy – 04 – B
Patent
C - Chemistry, Metallurgy
04
B
261/1, 25/141
C04B 35/00 (2006.01) C04B 35/65 (2006.01) C22C 1/05 (2006.01) C22C 1/10 (2006.01) C22C 29/12 (2006.01) C25C 3/08 (2006.01)
Patent
CA 1256457
ABSTRACT A method is disclosed for manufacturing a reaction sintered composite article which comprises at least one ceramic component. The method comprises preparing a particulate mixture of precursor powders leading to the formation of said composite material upon reaction sintering, pressing said particulate mixture to a self-sustaining body, heating said body up to a temperature below the temperature at which the reaction sintering is initiated, comminuting the heat treated body, selecting particles of a suitable grain size distribution, pressing said particles into shapes of desired size and configuration, and heating said shapes up to a temperature at which the reaction sintering is initiated. The reaction sintered body comprises borides, carbides, nitrides or silicides of a transition metal of the groups IVb, Vb or VIb of the periodic table (comprising titanium, hafnium, zirconium, vanadium, niobium, tantalum, chromium, molybdenum and tungsten), and a metal oxide. In the case that the composite material comprises A1203, TiB2 and facultatively A1, the precursor powder may comprise TiO2, B2o3 and Al. Composite bodies of sizes, shapes, varying compositions or other particular configurations which do not allow for the preparation of the final bodies in one operation are produced by preparing sub-sections of precursor shapes which are pressed in a first pressing operation, assembled to a shape of essentially the final configuration, again pressed and reaction sintered.
509420
Chevigne Michel
Darracq Dominique
Wiaux Jean-Pol
Gowling Lafleur Henderson Llp
Moltech Invent S.a.
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