Gravity and low-pressure die-casting

2 Casting in permanent moulds 2.6.2.1 Gravity and low-pressure die-casting 

Permanent mould coatings are typically formulated using water as a carrier, a high temperature binder (normally sodium silicate) and a refractory filler or blend of fillers. There are two categories of coatings  

Coatings are generally sprayed onto the die. Careful attention to die preparation, coating preparation and application and the t5q)e of coating equipment utilised can yield significant quality and productivity benefits. 

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Permanent mould casting involves the injection of molten metal into a metal mould. The mould is opened after solidification and the easting is taken out for finishing. Chemieally-bonded sand cores are used to a limited extent in gravity and low-pressure die-casting. 

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