Process for producing shaped refractory products

Details Process for producing shaped refractory products Process for producing shaped refractory products

1988-10-04

1991-03-26

Group, Karl

Compositions: ceramic

Ceramic compositions

Pore-forming

501 96, 501 98, 423409, 423412, 264 292, 264 294, 264 296, C04B 3558

Patent

active

050029045

ABSTRACT:
Shaped refractory products, particularly in the form of hollow spheres, and a process for their formation. The process involves dispersing particles of silica or a metal oxide, e.g. Al.sub.2 O.sub.3, in an organic polymer, shaping the dispersion into a desired shape, heating the shaped dispersion in a non-oxidizing atmosphere to carbonize the polymer, and heating the carbonized product at high temperature in a non-oxidizing atmosphere containing nitrogen so that some of the oxide is converted to the corresponding nitride and the particles of unreacted oxide sinter together. The ratio of oxide to carbon should be high so that some but not all of the oxide is converted to the nitride and, preferably, only a relatively small amount should be converted. The resulting refractory material is strong and can be used for a variety of uses, e.g. catalyst supports, packing materials and insulating materials.

REFERENCES:
patent: 4256676 (1981-03-01), Kovach
patent: 4615863 (1986-10-01), Inoue et al.
patent: 4652436 (1987-03-01), Kato
patent: 4670407 (1987-06-01), Kiehl et al.
patent: 4780299 (1988-10-01), Kumagai et al.
patent: 4784839 (1988-11-01), Bachelard et al.
patent: 4851205 (1989-07-01), Mitomo
patent: 4857246 (1989-08-01), Bolt

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