Vol 7, No 6 (2016) > Mechanical Engineering >

The Effect of Temperature Increase, Holding Time and Number of Layers on Ceramic Shells using the Investment Casting Process

Tresna Priyana Soemardi, Agri Suwandi, Gandjar Kiswanto, Widjajalaksmi Kusumaningsih

 

Abstract: This study aimed to
determine the effect of using acrylonitrile butadiene styrene in place of
conventional wax material on treatment pattern removal in the investment
casting process.  There are three
controllable process variables that can affect treatment pattern removal, which
include temperature increase, holding time and the number of layers of ceramic
shell that have been considered for comparison. Comparison among the effects of
temperature increase, holding time and numbers of ceramic shell layers on the
ceramic shell was analyzed using ANOVA. It was found that temperature increase
(Tx), holding time (t) and number of layers of ceramic shell
(N) contribute significantly to the
length of the crack (l) on the
ceramic shell. The crack in the ceramic shell’s surface was analyzed using
scanning electron microscope photos. Less layers number cause the increase of
crack length. The combination between temperature upraise and longer holding
time cause cracking delay. The experimental is conducted by using 3 (three)
variants for each of layers number, temperature and holding time. The layers
number is ranging between 7-9 layers. Temperature increase from room
temperature until 1300oC. The layers number variant is ranging
between 180-300 seconds. It was concluded that a longer holding time will
result in a more intact ceramic shell, as longer holding
times yield short crack lengths.
Keywords: Acrylonitrile butadiene styrene; Ceramic shell; Holding time; Number of layers; Temperature increase

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