Variable-permeability pattern coating for lost foam casting

Details Variable-permeability pattern coating for lost foam casting Variable-permeability pattern coating for lost foam casting

1982-07-26

1984-11-13

Goldberg, Howard N.

Metal founding

Process

Shaping a forming surface

164 45, 164249, B22C 902

Patent

active

044820003

ABSTRACT:
A vaporizable pattern for casting reduced porosity metal by a lost foam process is coated with a thermally insulative, predominantly refractory particulate layer comprising polymeric particles. During metal casting, the refractory particles insulate the polymeric particles to delay vaporization, whereupon pattern decomposition vapors build up and slow metal replacement of the pattern to reduce vapor-entrapping turbulence. Subsequent vaporization of the polymeric particles produces pores in the residual refractory coating wherethrough pattern decomposition vapors readily vent to avoid entrapment in the metal.

REFERENCES:
patent: 3169288 (1965-02-01), Dewey
patent: 3314116 (1967-04-01), Wittmoser et al.
patent: 3339620 (1967-09-01), Kryyzanowski et al.
patent: 3410942 (1968-11-01), Bayer
patent: 3498360 (1970-03-01), Wittmoser et al.
patent: 4010791 (1977-03-01), Hetke et al.

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