The effect of fused silica crystallization on flexural strength and shrinkage of ceramic cores for investment casting

Young Hwan Kim, Jeong Gu Yeo, Sung Churl Choi

Research output: Contribution to journalArticle

4 Citations (Scopus)

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 1150 °C to 1400°C for various dwelling times (6 h to 48 h). Sintering above 1300°C for 12 h and dwelling time over 24 h at 1200°C 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 1200°C for 12 h endured wax patterning and shell molding, and was manufactured successfully.

Original languageEnglish
Pages (from-to)246-252
Number of pages7
JournalJournal of the Korean Ceramic Society
Volume53
Issue number2
DOIs
StatePublished - 2016 Mar 1

Fingerprint

Investment casting
Fused silica
Crystallization
Bending strength
Sintering
Silicon Dioxide
Mechanical properties
Microcracking
Waxes
Heating rate
Injection molding
Molding
Phase transitions
Silica
Temperature

Keywords

  • Ceramic core
  • Crystallization
  • Fused silica
  • Mechanical properties

Cite this

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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.

In: Journal of the Korean Ceramic Society, Vol. 53, No. 2, 01.03.2016, p. 246-252.

Research output: Contribution to journalArticle

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