Release time： 2020-05-27 11:06:00.000
①Higher purity and cleanliness, taking silica sand as an example, the content of SiO2 is required to be more than 90% for cast iron sand and more than 97% for larger steel castings;
③Appropriate particle shape and particle composition;
④Not easily infiltrated by liquid metal;
⑤Cheap and easy to get.
The particle shape and composition of foundry sand affect the fluidity, compactness, permeability, strength and resistance to penetration of liquid metal of the sand, which is an important index of the quality of foundry sand.
②Polygonal sand: The particles are polygonal and most of them have obtuse angles.
③ Sharp Angle Shaped Sand: The particles are sharp angle shaped and most of them are acute angle. The particle shape of casting sand is generally expressed by angle coefficient (sand actual specific surface area/sand theoretical specific surface area).
According to the different mineral composition, foundry sand can be divided into silica sand and non-silica sand.
Silica Sand: The main mineral composition of silica sand is SiO2.
Non-siliceous Sand: There are many kinds of non-siliceous sand with different uses.
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