Hardness and Fracture Toughness of Alumina-Doped Tetragonal Zirconia with Different Yttria Contents

• Vasylkiv Oleg

  National Institute for Materials Science Institute for Materials Science, NASU 3

• Sakka Yoshio

  National Institute for Materials Science

• Skorokhod Valeriy V.

  Institute for Materials Science, NASU 3

抄録

The 0.75 to 3.0 mol% Y₂O₃-stabilized tetragonal ZrO₂ (Y-TZP) and Al₂O₃/Y-TZP fine-grained ceramics with 0.2 to 0.7 mass% of alumina were produced by a colloidal technique and low-temperature sintering. Trace alumina addition enhanced the densification of Y-TZP. The influence of the resulting density, microstructure, the yttria-stabilizer and the alumina content on the hardness and toughness were studied. The bulk 2.7Y-TZP ceramic with an average grain size of 110 nm reached a hardness of 13.6 GPa and fracture toughness of 11.2 MPa·m^1⁄2. Y-TZP ceramics with a reduced yttria-stabilizer content were found to reach a fracture toughness of 13.8 MPa·m^1⁄2 (2Y-TZP), and 14.5 MPa·m^1⁄2 (1.5Y-TZP). A nano-grained alumina dispersed zirconia with 3 mol% Y₂O₃ with an average grain size of 97 nm was obtained, and the hardness increased to 16.8 GPa. Y-TZP/alumina ceramics with a 0.35 mass% Al₂O₃ were found to reach a fracture toughness of 15.7 MPa·m^1⁄2 (2Y) and 15.3 MPa·m^1⁄2 (1.5Y).

収録刊行物

• MATERIALS TRANSACTIONS

  MATERIALS TRANSACTIONS 44 (10), 2235-2238, 2003

  公益社団法人 日本金属学会

キーワード

• sintering
• nanocomposite
• hardness test
• oxides

詳細情報

• CRID: 1390282679225027584
• NII論文ID: 10011916390
• NII論文ID: 30018850657
• NII書誌ID: AA1151294X
• DOI: 10.2320/matertrans.44.2235
• COI: 1:CAS:528:DC%2BD3sXptFOnsbc%3D
• ISSN: 13475320
• ISSN: 13459678
• ISSN: http://id.crossref.org/issn/09161821
• NDL書誌ID: 6722598
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I6722598
• Web Site: https://www.jstage.jst.go.jp/article/matertrans/44/10/44_10_2235/_pdf
• 本文言語コード: en
• データソース種別:
  • JaLC
  • NDL
  • Crossref
  • CiNii Articles
• 抄録ライセンスフラグ: 使用不可