Why is starch used in precision casting?

In investment casting, starch is mainly used as a filling material and ablation model. Its main function is to create internal cavities or channels in castings with complex shapes.

Specifically, starch is used as a core material. The core is a pattern used to create the cavity or pipe inside the casting. During the casting process, the starch pattern is placed in the casting mold and fixed in a designated position. It is then dissolved or burned by The starch model is etched to create cavities or channels that allow molten metal to enter and fill the desired shape.

The advantages of starch as a core material include:
- Good processability: Starch can be easily formed into the desired shape and size, making it suitable for the production of complex parts.
- Degradability: Starch can be removed by dissolution or heat ablation after casting, without tedious manual processing.
- Environmentally friendly: Starch is a natural material that is easy to degrade and has little impact on the environment.

It should be noted that the application of starch in precision casting can also vary depending on specific processes and application fields, and can be adjusted and improved in conjunction with other materials and processes.