Microwave core process

Details Microwave core process Microwave core process

1979-07-02

1982-05-25

Hampilos, Gus T.

Metal founding

Process

Shaping a forming surface

164525, 164528, 1642501, B22C 118

Patent

active

043311970

ABSTRACT:
A rapid method for dehydrating a water-sand mixture containing sodium or potassium silicate to produce a strongly bonded sand core is disclosed. The silicate is mixed in a water/silicate ratio of 1.45-3.22:1 and is limited to 0.25-3% of the weight of the mixture. The core box is semi-foraminous and partially transparent to micro-wave energy whereby generated vapor is reduced due to the heated inner surface of the core box (some degree of lossiness) and due to some escape through limited core-box openings. The controlled supersaturated environment about the core serves to prevent micro-porosity and surface defects when controlled micro-wave energy is used to heat cure the mixture. To promote resistance to humidity after curing, the mixture may contain 0.5% zinc oxide, chromic oxide, or aminoaldehyde.

REFERENCES:
patent: 3692085 (1972-09-01), Brown et al.

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