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Co2 moulding is mainly used for the increase in strength and hardness of the moulds and cores.

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in Casting-Forming-Welding I by (687k points)
Co2 moulding is mainly used for the increase in strength and hardness of the moulds and cores.

(a) True

(b) False

I have been asked this question during an interview for a job.

Query is from CO2 Process topic in portion Special Casting Techniques of Casting-Forming-Welding I

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Correct option is (a) True

The explanation is: Mould is prepared by adding sodium silicate binder. Co2 gas is supplied to the mould for sufficient time. It reacts with sodium silicate and produces silica gel which has better bonding properties. Due to this strength and hardness of the large sized moulds and cores can be increased.

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