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How much time (in a minute) is usually required for the passing of Co2 through the mould?

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+1 vote
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in Casting-Forming-Welding I by (687k points)
How much time (in a minute) is usually required for the passing of Co2 through the mould?

(a) One

(b) Two

(c) Five

(d) Seven

The question was asked during a job interview.

My question comes from CO2 Process topic in section Special Casting Techniques of Casting-Forming-Welding I

1 Answer

+1 vote
by (828k points)
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Best answer
The correct choice is (a) One

To elaborate: In Co2 moulding, mould of sand is hardened by passing of Co2 for about one minute. The Co2 gas forms a weak acid that hydrolyzes the sodium silicate (Na2O, SiO2) solution to form amorphous silica gel which acts as the bond and sodium silicate itself also provides some bonding action.

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