Metal founding – Process – Shaping a forming surface
Patent
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.
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patent: 3410942 (1968-11-01), Bayer
patent: 3498360 (1970-03-01), Wittmoser et al.
patent: 4010791 (1977-03-01), Hetke et al.
Eley Timothy V.
Fekete Douglas D.
General Motors Corporation
Goldberg Howard N.
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