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While the fluorine included in mold flux is an additive widely applied to reduce viscosity and solidification temperature, it causes the corrosion of casting machine and the environmental pollution. In order to resolve these problems, F-free mold flux was examined in the glass system of CaO–SiO 2 –Al 2 O 3 –Na 2 O–B 2 O 3 , and their properties such...
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