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Patent Details

Indian Institute of Technology (IIT) Roorkee 
Improving the porosity of ceramic shell in investment casting process 
D. Benny Karunakar and Sanjay Kumar 
Indian Institute of Technology (IIT) Roorkee 
Application type:
Applied - 2017-08-09 
Application Number:
Applied at:
Entered by:
Indian Institute of Technology (IIT) Roorkee 
The present invention provides a modified ceramic shell for investment casting process with an improved porosity/permeability. The conventional ceramic shells are prepared using slurries that are developed by mixing aluminum silicate (as refractory powder) and colloidal silica (as binder). A molochite stucco is applied using rainfall stucco machine between successive slurry coatings. The modified ceramic shell / body (from the present work) and its method thereof includes the following steps. An extremely small amount of iodine is added to the inner coat slurry, which upon heating, got sublimed and left micro pores inside the inner coating of the shell. In a similar way, a small amount of needle coke is added to the outer coat slurry. During the firing of the shell, the coarse needle coke got burnt and, consequently, macro pores are created inside outer coating of the shell, which would enable escape of the undesirable gases that may generate inside the shell during pouring. This ultimately would enhance the porosity/permeability of the ceramic shell and reduce the porosity defects in the final cast parts. The modified ceramic shell also possesses adequate mechanical properties like flexural strength, tensile strength and fair inner surface roughness. 

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