Effects of the two-step sintering process on the optical transmittance and mechanical strength of polycrystalline alumina ceramics

Hyung Soo Kim, Sung Tag Oh, Young Do Kim

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

The effects of a two-step sintering (TSS) process on the optical transmittance and mechanical strength of polycrystalline alumina ceramics were analyzed. High-purity alumina with a ppm impurity level was fabricated using a ceramic injection molding process by applying a TSS process in a high temperature vacuum atmosphere. A temperature of 1780 °C was effective for the first step sintering, which represents the highest densification rate, and a second isothermal sintering condition of 1300-1600 °C was applied for a different length of time to prevent surface diffusions and the secondary phases. An increasing sintering temperature and hold time in the TSS process proportionally increased the grain size and growth in the sintering bodies.

Original languageEnglish
Pages (from-to)14471-14475
Number of pages5
JournalCeramics International
Volume40
Issue number9 PART A
DOIs
StatePublished - 2014 Jan 1

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Aluminum Oxide
Opacity
Strength of materials
Alumina
Sintering
Surface diffusion
Densification
Injection molding
Temperature
Vacuum
Impurities

Keywords

  • Ceramic injection molding
  • Optical transmittance
  • Polycrystalline alumina
  • Translucent ceramic
  • Two-step sintering

Cite this

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Effects of the two-step sintering process on the optical transmittance and mechanical strength of polycrystalline alumina ceramics. / Kim, Hyung Soo; Oh, Sung Tag; Kim, Young Do.

In: Ceramics International, Vol. 40, No. 9 PART A, 01.01.2014, p. 14471-14475.

Research output: Contribution to journalArticle

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AU - Oh, Sung Tag

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