Variable-permeability, two-layer pattern coating for lost foam c

Details Variable-permeability, two-layer pattern coating for lost foam c Variable-permeability, two-layer pattern coating for lost foam c

1982-07-26

1984-05-15

Hampilos, Gus T.

Metal founding

Process

Shaping a forming surface

164 45, 164249, B22C 902, B22C 700

Patent

active

044482353

ABSTRACT:
A vaporizable pattern for casting reduced porosity metal by a lost foam process is coated first with a thermally insulative, refractory layer characterized by a relatively high gas permeability and thereafter with a vaporizable polymeric layer characterized by a relatively low gas permeability. During metal casting, the refractory layer insulates the polymeric layer to delay vaporization, whereupon the low permeability causes pattern decomposition vapors to build up and slow metal replacement of the pattern to reduce vapor-entrapping turbulence. After vaporization of the polymeric layer, the vapors readily vent through the high permeability, refractory layer to avoid entrapment in the metal.

REFERENCES:
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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