High Temperature Deformation of Mullite-Zirconia Ceramics Hot-Pressed from Rapidly Solidified Powder.

• Ito Hisashi

  Department of Mechanical and Electrical Engineering, Tokuyama College of Technology

• Nakano Kazunori

  Technical Research Laboratory, Toyo Kohan Co., Ltd.

• Takagi Ken-ichi

  Technical Department, Toyo Koham Co., Ltd.

• Kuroki Hidenori

  Faculty of Engineering, Hiroshima University

Bibliographic Information

Other Title

• 急速凝固粉末を用いたジルコニア含有ムライトセラミックス焼結体の高温変形
• キュウソク ギョウコ フンマツ オ モチイタ ジルコニア ガンユウ ムライト

Abstract

Three kinds of mullite, termed CP, HK and HP mullite (in order of increasing purity) containing 30 mass% zirconia were rapidly solidified to obtain amorphous ceramic powder. The rapidly solidified (RS) amorphous powder was hot-pressed exhibiting a very fine microstructure. High temperature deformation behaviour was assessed using 3 point bending and tensile tests. It was found that (1) The RS specimens exhibited greater ductility than the non RS specimens in the bending test at elevated temperature. (2) The bending force at elevated temperature was dependant on the bending rate. A bending rate sensitivity index (m') of approximately 0.5 was derived from a bending rate (ν) of 10^-3 mm s^-1 for both HK-RS and HK-non RS materials. The bending force for the RS material was lower than that of the non RS material. (3) The tensile stress at elevated temperature was dependant on strain rate. The strain rate sensitivity index (m) was approximately 0.5 at an initial strain rate (ε) of 2.5×10^-4 s^-1 for both HK-RS and non RS materials. The flow stress for the RS material was lower than that of the non RS material. A fracture strain of 80% was achieved at the same strain rate for RS material. (4) The ductility exhibited by the RS materials increased at elevated temperature. This was attributed to the ultrafine microstructure which was thought likely to encourage superplastic behaviour.

Journal

• Journal of the Japan Society of Powder and Powder Metallurgy

  Journal of the Japan Society of Powder and Powder Metallurgy 45 (2), 182-188, 1998

  Japan Society of Powder and Powder Metallurgy

Keywords

• rapid solidificaton
• amorphous ceramic
• Plasma Centrifugal Atomization (PCA)
• superplasticity

Details

• CRID: 1390001206308558208
• NII Article ID: 10002015110
• NII Book ID: AN00222724
• DOI: 10.2497/jjspm.45.182
• ISSN: 18809014
• ISSN: 05328799
• NDL BIB ID: 4413746
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I4413746
• Text Lang: ja
• Data Source:
  • JaLC
  • NDL
  • Crossref
  • CiNii Articles
• Abstract License Flag: Disallowed