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10.8: Investment Casting

Last updated

Aug 24, 2023
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- 10.7: Continuous Casting
- 10.9: Other Methods of Casting

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Investment casting is used to make precision parts with a good surface finish. It is used to make turbine blades from a single crystal Ni-based superalloys. As the moulds are made from ceramic, metals with high melting points can be cast in this way.

A pattern of the required component is formed out of wax usually through injection moulding into a metal mould. A runner and gate are included within the wax pattern. Pre formed ceramic cores can also be added, so that hollow castings can be made.
Many wax patterns are then connected together to form a tree, and this is then dipped into a ceramic slurry, which sets through drying. Different layers of ceramic are created around the wax patterns, increasing in coarseness.
The wax patterns are then melted out, ready for the molten metal to be poured in to create the castings.
The ceramic mould is broken to reveal the castings, and any ceramic cores added at the start can be chemically etched out to leave a hollow structure.


Investment wax	Investment mould	Investment blades

https://www.doitpoms.ac.uk/tlplib/ca...entcasting.mp4

Advantages

Metals with a high melting temperature can be cast due to ceramic mould
Complex shapes can be formed by using ceramic liners in the original wax patterns
Good surface finish can be obtained using fine ceramic material

Disadvantages

Expensive as mould cannot be reused
Time consuming (drying times for ceramic range roughly 24 hrs)

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