Plastic and nonmetallic article shaping or treating: processes – Carbonizing to form article – In specific atmosphere
Patent
1988-11-01
1990-11-27
Silbaugh, Jan H.
Plastic and nonmetallic article shaping or treating: processes
Carbonizing to form article
In specific atmosphere
264 43, 264 44, B28B 150
Patent
active
049734350
ABSTRACT:
Porous membranes made of sintered refractory metal oxides, e.g., silica aluimina, titania, zirconia, tungsten oxide, etc., and to a process for their formation. The membranes are formed by dispersing a powder of the metal oxide in an organic polymer. The relative amount of metal oxide to polymer is such that, after the polymer has been carbonized in a subsquent step, there is a stoichiometrical excess of the oxide to carbon. The solution is then shaped to form a desired thin membrane, and the polymer is then carbonized by heating it in a non-oxidizing atmosphere. The resulting oxide/carbon product is heated to a temperature at which (a) the carbon reacts with the oxide to form a volatile sub-oxide and carbon monoxide and (b) the remaining (unreacted) oxide particles sinter together. The heating is carried out in a non-oxidizing atmosphere containing either no nitrogen whatsoever, or an amount of nitrogen less than that which results in the formation of a non-porous product. The sintered membranes can be used, for example, as filters and catalyst supports and have good strength and controlled porosity.
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Jain Mukesh K.
Nadkarni Sadashiv K.
Alcan International Limited
Fiorilla Christopher A.
Silbaugh Jan H.
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