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The Effect of Fused Silica Crystallization on Flexural Strength and Shrinkage of Ceramic Cores for Investment Casting
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 Title & Authors
The Effect of Fused Silica Crystallization on Flexural Strength and Shrinkage of Ceramic Cores for Investment Casting
Kim, Young-Hwan; Yeo, Jeong-Gu; Choi, Sung-Churl;
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 Abstract
Complex designed silica-based ceramic cores were fabricated by ceramic injection molding. Slow heating rate (0.2K/min) for debinding restrained bloating on the surface of ceramic cores. To investigate effect of sintering conditions on mechanical properties of ceramic cores, green bodies were sintered at temperatures in a range from to for various dwelling times (6 h to 48 h). Sintering above for 12 h and dwelling time over 24 h at reduce the flexural strength and increase the linear shrinkage of ceramic cores. Cristobalite, formed by high sintering temperature or long dwelling time, induces reduction of mechanical properties due to its phase transformation, which is accompanied by volume contraction and microcracking. Ceramic core sintered at for 12 h endured wax patterning and shell molding, and was manufactured successfully.
 Keywords
Fused silica;Ceramic core;Mechanical properties;Crystallization;
 Language
English
 Cited by
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