Effect of B4C addition on the microstructures and mechanical properties of ZrB2-SiC ceramics

Jung Min Chae, Sung Min Lee, Yoon Suk Oh, Hyung Tae Kim, Kyung Ja Kim, Sahn Nahm, Seongwon Kim

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

ZrB2 has a melting point of 3245°C and a relatively low density of 6.1 g/cm3, which makes this a candidate for application to ultrahigh temperature environments over 2000°C. Beside mese properties, ZrB2 is known to have excellent resistance to thermal shock and oxidation compared with other non-oxide engineering ceramics. In order to enhance such oxidation resistance, SiC was frequently added to ZrB 2-based systems. Due to nonsinterability of ZrB2-based ceramics, research on the sintering aids such as B4C or MoSi 2 becomes popular recently. In this study, densification and high-temperature properties of ZrB2-SiC ceramics especially with B4C are investigated. ZrB2-20 vol% SiC system was selected as a basic composition and B4C or C was added to this system in some extents. Mixed powders were sintered using hot pressing (HP). With sintered bodies, densification behavior and high-temperature (up to 1400°C) properties such as flexural strength, hardness, and so on were examined.

Original languageEnglish
Pages (from-to)578-582
Number of pages5
JournalJournal of the Korean Ceramic Society
Volume47
Issue number6
DOIs
Publication statusPublished - 2010

Keywords

  • BC addition
  • High-temperature mechanical properties
  • Ultra-high temperature ceramics (UHTCs)
  • ZrB-SiC

ASJC Scopus subject areas

  • Ceramics and Composites

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