Certain basic elements in the earlier development of investment casting process, as well as many current advancements made to the process, some due to the rapid growth in technology, are described in this chapter.
Investment casting is often called lost wax casting, and it is based on one of the oldest metal forming processes. The Egyptians used the process, some years ago, to make gold jewelry, as exact replica of many intricate shapes, cast in gold from artfully created beeswax patterns. In the investment casting process, a ceramic slurry is applied, or invested, around a disposable pattern, usually wax, and is allowed to harden to form a disposable casting mold. The wax pattern is lost, when it is melted out from the disposable ceramic mold,
which is later destroyed to recover the casting.