Compositions: coating or plastic – Coating or plastic compositions – Molds and mold coating compositions
Patent
1983-05-05
1985-08-20
Hayes, Lorenzo B.
Compositions: coating or plastic
Coating or plastic compositions
Molds and mold coating compositions
106 389, 106104, B28B 734
Patent
active
045362165
ABSTRACT:
The cement of the invention comprises chemically combined oxides, percent by mass: CaO, 50 to 60; Al.sub.2 O.sub.3, 28 to 37; Fe.sub.2 O.sub.3, 0.01 to 1; SiO.sub.2, 0.1 to 8; Na.sub.2 O, 0.1 to 1; K.sub.2 O, 0.1 to 0.5; H.sub.2 O, 3 to 12; and incorporates 85 to 99% by mass of a fraction with a particle size of below 80 .mu.m and 1 to 15% by mass of a fraction with a particle size of from 80 to 200 .mu.m. The cement can also contain one or more additives: calcium oxide or calcium hydroxide, calcium carbonate, calcium carboaluminate.
The method according to the invention for preparing said cement comprises a heat-treatment of calcium hydroalumosilicate containing SiO.sub.2 in an amount of not more than 8% by mass at a temperature of from 250.degree. to 600.degree. C. The heat-treated product is disintegrated to produce 85 to 99% by mass of a fraction with a particle size of below 80 .mu.m and 1 to 15% of a fraction with a particle size of from 80 to 200 .mu.m.
During the heat-treatment of the hydroalumosilicate at least one component can be added calcium oxide or calcium hydroxide, calcium carbonate, calcium carboaluminate.
The cement is useful in foundry engineering for the manufacture of articles from ferrous and non-ferrous metals.
REFERENCES:
patent: 2081558 (1937-05-01), Prange
patent: 2887392 (1959-05-01), Lolley et al.
Ved et al., "Physico-Chem. Principles of Technology of Steam-Cured Bldg. Mat'ls", Beedivelnik, 1966.
Shvite et al., "Calcium Hydrocarboaluminates and Hydroferrites", 1969.
Alexeev Alexei I.
Andreev Vladimir V.
Badaliants Khoren A.
Kaluzhsky Nikolai A.
Korneev Valentin I.
Hayes Lorenzo B.
Vsesojuzny Nauchno-Issledovatelsky I Proektny Institut Aljuminie
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