MISC

2004年9月

Improvement of mechanical properties and corrosion resistance of porous beta-SiAlON ceramics by low Y2O3 additions

JOURNAL OF THE AMERICAN CERAMIC SOCIETY
  • HF Yang
  • ,
  • GJ Zhang
  • ,
  • HH She
  • ,
  • T Ohji
  • ,
  • S Kanzaki

87
9
開始ページ
1714
終了ページ
1719
記述言語
英語
掲載種別
DOI
10.1111/j.1551-2916.2004.01714.x
出版者・発行元
AMER CERAMIC SOC

Addition of Y2O3 as a sintering additive to porous beta-SiAlON (Si6-zAlzOzN8-z, z = 0.5) ceramics has been investigated for improved mechanical properties. Porous SiAlON ceramics with 0.05-0.15 wt% (500-1500 wppm) Y2O3 were fabricated by pressureless sintering at temperatures of 1700degrees, 1800degrees, and 1850degreesC. The densification, microstructure, and mechanical properties were compared with those of Y2O3-free ceramics of the same chemical composition. Although this level of Y2O3 addition did not change the phase formation and grain size, the grain bonding appeared to be promoted, and the densification to be enhanced. There was a significant increase in the flexural strength of the SiAlON ceramics relative to the Y2O3-free counterpart. After exposure in 1M hydrochloric acid solution at 70degreesC for 120 h, no remarkable weight loss and degradation of the mechanical properties (flexural and compression strength) was observed, which was attributed to the limited grain boundary phase, and with the minor Y2O3 addition the supposed formation of Y-alpha-SiAlON.

リンク情報
DOI
https://doi.org/10.1111/j.1551-2916.2004.01714.x
Web of Science
https://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=JSTA_CEL&SrcApp=J_Gate_JST&DestLinkType=FullRecord&KeyUT=WOS:000224192900016&DestApp=WOS_CPL
ID情報
  • DOI : 10.1111/j.1551-2916.2004.01714.x
  • ISSN : 0002-7820
  • Web of Science ID : WOS:000224192900016

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