تأثير المضافات على خواص القوالب الرملية المستخدمة لصب حديد الزهر الرمادي

الملخص EN

This research is devoted to study the effect of some additives such as glycerol, oat flour, rye flour, glue, PVC and Na2CO3 on properties of sand moulds then their effects on cast iron castings resulted from casting in these moulds.

To prepare sand mixture with suitable properties for casting the required metal, various percentages of additives were added (after selecting the optimum percentage of bentonite and water) to the mixture to show their effects on the properties of the sand mould.

Several tests were performed on the castings showed that those obtained from pouring in a mould composed of a mixture containing 0.5% glue, have better surface and mechanical properties, where the mould hardness was (75 Brinell scale) and its green strength was (0.046 MPa) in comparison to other additives, which gave less surface and mechanical properties.