Casting core composition

Details Casting core composition Casting core composition

1996-04-24

1997-03-18

Hoke, Veronica P.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Processes of preparing a desired or intentional composition...

524444, C08K 322

Patent

active

056123930

ABSTRACT:
The invention relates to a casting core composition including refractory mullite grains and 1.0-2.2 wt % of a phenolic resin for binding the mullite grains. The mullite grains are substantially spherical in shape and have a special grain size distribution. That is, the mullite grains contain first to eighth fractions. These fractions respectively have first to eighth diameters which are respectively within ranges of larger than 420 .mu.m, 297-420 .mu.m 210-297 .mu.m, 149-210 .mu.m, 105-149 .mu.m, 74-105 .mu.m, 53-74 .mu.m, and smaller than 53 .mu.m.

REFERENCES:
patent: 3616108 (1971-10-01), Whitehouse et al.
patent: 4381355 (1983-04-01), Henry, Jr. et al.
patent: 4387173 (1983-06-01), Henry, Jr. et al.
patent: 4460730 (1984-07-01), Koyama et al.
Japanese Industrial Standard, #JIS Z2602, p. 5 (1976).
Perry's Chemical Engineer's Handbook, Sixth Edition, pp. 21-15 (1984).
Product specification for the "Naigai Cerabeads 60", pp. 2-3 (1987).

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