C - Chemistry – Metallurgy – 04 – B
Patent
C - Chemistry, Metallurgy
04
B
39/101, 204/198,
C04B 35/52 (2006.01) C04B 35/10 (2006.01) C04B 35/532 (2006.01) C04B 35/64 (2006.01) C04B 35/83 (2006.01) C25B 11/12 (2006.01) C25C 3/12 (2006.01) F27B 14/10 (2006.01)
Patent
CA 2019667
ABSTRACT Carbon matrix materials of low porosity and high density, and process of producing the same. The invention requires the use of a particulate heat-treated sub-alpha alumina as a matrix texture modifier. The preferred matrix texture modifier is heat-treated gamma-alumina, and is most preferably the waste dust collected during the calcination of aluminum trihydrate carried out as a step of the Bayer process for the production of alumina. The sub-alpha alumina is heated at a temperature of 400 - 450°C, usually for 12 - 24 hours, before use as a matrix texture modifier in the present invention. As an alternative to the use of this preferred modifier, a similar modifier may be prepared by the low temperature calcination of aluminum trihydrate at 400 - 500°C followed by milling to produce particles of an appropriate size (generally <50µm). The material produced by the invention has a greater density, a smaller pore size and a reduced tendency to shrink and crack during carbonization than equivalent material produced without the use of the matrix texture modifier. When the material is a carbon composite (i.e. a carbon matrix reinforced by fibres and/or fillers), fewer subsequent densification and baking steps are required to prepare a useful product than is usually the case with conventional procedures. The product of the invention can be used for the same applications as conventional carbon matrix materials.
Francoeur Jacques R.
Gesing Adam J.
Rhedey Paul J.
Alcan International Limited
Francoeur Jacques R.
Gesing Adam J.
Kirby Eades Gale Baker
Rhedey Paul J.
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