Foamed insulation refractory

Details Foamed insulation refractory Foamed insulation refractory

1978-03-16

1979-06-19

White, Robert F.

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

Of inorganic materials

106 40R, 106 64, 106 71, 264 86, C04B 4300

Patent

active

041586859

ABSTRACT:
A foamed insulating refractory shape is made by: (1) preparing a slip of water, deflocculating agent, refractory aggregate, at least 7.5% by weight cement, and, optionally, clay; (2) forming a foam of water, foaming agent, and air having a density not over about 5 lbs per cubic foot (80 g/l); (3) admixing the slip and the foam to form a foamed slurry with a viscosity between 1000 and 30,000 centipoises, the amount of water in the slip being adjusted to yield the desired viscosity in the foamed slurry; (4) pouring the foamed slurry into molds; (5) curing the pieces so formed at a temperature not over about 72.degree. F. (about 22.degree. C.) for about 16 to 24 hours; (6) drying the pieces at a temperature not over about 200.degree. F. (about 93.degree. C.); and (7) firing the pieces. The method of this invention produces insulating refractory shapes with higher strength-to-weight ratios than those produced by prior art methods.

REFERENCES:
patent: 3232772 (1966-02-01), Hilton et al.
patent: 3508940 (1970-04-01), Webb

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