Manufacture of silicon carbide foam from a polyurethane foam imp

Details Manufacture of silicon carbide foam from a polyurethane foam imp Manufacture of silicon carbide foam from a polyurethane foam imp

1995-03-13

1995-09-12

Pal, Asok

Catalyst, solid sorbent, or support therefor: product or process

Catalyst or precursor therefor

Inorganic carbon containing

501 88, 423345, 55523, B01J 27224, C01B 3136, B01D 3920

Patent

active

054496543

ABSTRACT:
The invention concerns a process for preparing a silicon carbide foam consisting of attacking a polyurethane foam with an alkaline solution, impregnating it, after rinsing and drying, with a suspension of silicon powder in an organic resin, heating progressively to polymerise the resin, carbonising the polyurethane foam and resin, and finally carburising the silicon contained in the resin suspension by means of the carbon originating from the carbonisation of the foam and resin.
The foams obtained are characterised by a high microporosity and a mesoporosity which is variable according to the carburising temperature.
The invention finds an application in the manufacture of catalyst carriers for exhaust chambers and filters for diesel engines.

REFERENCES:
patent: 4112032 (1978-09-01), Blaszyk et al.
patent: 4242235 (1980-12-01), Cognion et al.
patent: 5217930 (1993-06-01), Dubots
patent: 5395807 (1995-03-01), Divakar et al.

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