28-10-2014, 03:26 PM
Abstracts: Investment casting is commonly used to produce high quality metal products with relatively close dimensional tolerances. The investment casting process is well known and commonly practiced. Generally, an investment casting of a part is made by creating a thin-walled ceramic mold over a previously formed pattern of the part. After the mold or shell has hardened, the pattern is melted or otherwise removed from it. The ceramic shell is then filled with a molten metal and allowed to solidify. The shell is then removed to reveal the desired part. A composition and method for forming investment casting shells includes using colloidal silica, zircon flour, and fused silica in a slurry which is applied to a pattern. After the slurry is applied to the pattern, it is allowed to partially or completely solidify. We discovered the improved composition by adding 10% caco3 & 3% fly-ash of weight of slurry.the improved shell slurry composition and corresponding method minimizes pattern-to-pour cycle times and is environmentally friendly. we have to reduce the 2 number of coating from 10 layer coating. Ultimately time consumption of 2 layer is reduced and the production of part become fast. It also reduces the extra labour cost for making 2 layer.