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Magnesium cannot be used extensively for precision casting applications.(a) True(b) FalseI had been asked this question in quiz.My query is from Magnesium Alloys topic in section Foundry Introduction & Materials of Casting-Forming-Welding II

Answer»

Right answer is (a) True

Easy explanation: MAGNESIUM cannot be used extensively for precision casting APPLICATIONS because it is highly reactive with silica containing constituents like plaster or other mould materials. Silica is mostly present in slurry in which it acts like binding MATERIAL. Reaction of magnesium with silica produces magnesium oxide and magnesium silicide which may imparts defects in the casting components.



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