Copper is a non-ferrous metal closely related to humans. Tin bronze is a non-ferrous metal alloy with the smallest casting shrinkage rate. It is used to produce castings with complex shapes, clear outlines and low air tightness requirements. So what kind of tin bronze is really suitable for producing castings?
When the tin content is less than 5~6%, tin dissolves in copper to form a solid solution, and the plasticity increases. When the tin content is greater than 5~6%, due to the appearance of a Cu31sb8-based solid solution, the tensile strength decreases, so the scale is The tin content of tin bronze is mostly between 3-14%. When the tin content is less than 5%, it is suitable for cold deformation processing, and when the tin content is 5 to 7%, it is suitable for hot deformation processing. When the tin content is greater than 10%, it is suitable for casting.
Because tin bronze has a wide crystallization temperature range and poor fluidity, it is not easy to form concentrated shrinkage cavities, and it is easy to form dendritic segregation and dispersed shrinkage cavities. The casting shrinkage rate is small, which is conducive to obtaining castings with a size very close to the mold, so it is suitable for casting The shape is complicated. The condition of large wall thickness is not suitable for casting castings that require high density and good sealing.
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