Manufacture of porous refractory materials by the

摘要

Porous agglomerates are made by mixing refractory particles (e.g. brick, metal powders, or oxides) with expanded plastic grains (e.g. polystyrene, rigid polyurethane or polyvinyl chloride), moulding the product to the required form, and then heating to 50 deg.-120 deg.C to expand the plastic, finally firing the agglomerate to 150 deg.-2,000 deg.C. The materials can be used for thermal insulation, filtration, catalysis, etc. according to their composition. The main advantage is that the pores are of controlled size and shape, being the same as that of the plastic particles removed.