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Copper alloy casting materials and their process characteristics
- May 16, 2018 -

Non-ferrous metal castings such as copper alloy castings are used in a wide range of applications in our lives because people have seen good wear resistance, corrosion resistance, electrical conductivity and thermal conductivity, and a certain degree of strength so that they can be part of refrigeration equipment. It is used.

There are two types of materials used in copper alloy casting, namely brass and bronze. Brass is divided into common brass and special brass. Bronze is divided into tin bronze and special bronze. Since ordinary brass is a binary alloy of copper and zinc, its mechanical properties are good, and it is widely used in the manufacture of general wear-resistant and corrosion-resistant parts. 

In the copper alloy casting process, in order to improve the performance of ordinary brass, a small amount of other elements are added to the ordinary brass to form a special brass, which meets the casting requirements for heavy-duty gears, worm gears, and marine propellers.

In contrast, tin bronze has higher wear resistance and corrosion resistance than brass, but its casting performance is inferior to that of brass. Microcast shrinkage is easily generated in castings made by copper alloy casting process. Therefore, it is only applicable. To produce wear-resistant and corrosion-resistant parts with low air tightness requirements. However, it is only necessary to add phosphorus element to the tin bronze to obtain higher strength and wear resistance, and it is suitable for casting parts that withstand heavy loads and high wear resistance.

According to experience, the copper alloy casting process is characterized by the large shrinkage of most copper alloys. For this reason, it is necessary to control the solidification sequence during casting to prevent the formation of shrinkage cavities. During casting, it is not necessary to stop the flow, and the pouring system should be capable of preventing the molten metal. Splashing, so that the metal fluid flow smoothly; and before casting fully stirred, so that the liquid composition as uniform as possible, and the rapid cooling of the castings to reduce the proportion of segregation phenomenon.