Maintaining the mechanical strength of La-, Y-co-substituted zirconia porous ceramics through the superplastically foaming method

Akira Kishimoto, Masanori Okada, Takasi Teranisi, Hidetaka Hayashi

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

The superplastically foaming method was adopted to make closed-pore inclusive zirconia-based ceramics. Lanthanum oxide was added to monoclinic or tetragonal yttria-stabilised zirconia to reduce the thermal conductivity of the matrix. Sintering and superplastic deformation led to a solid solution and transformation to the cubic phase. The resulting superplastically foamed porous ceramics having a porosity of 45% had only 40% of the thermal conductivity of the fully densified ceramics having the same composition. This value was comparable to that of conventionally fabricated porous ceramics with the same composition and porosity. The superplastically foamed ceramics had 60%, while conventionally fabricated ceramics had only 20%, of the mechanical strength of the fully dense ceramics.

Original languageEnglish
Pages (from-to)98-103
Number of pages6
JournalMaterials Science and Engineering A
Volume581
DOIs
Publication statusPublished - Oct 1 2013

Fingerprint

foaming
zirconium oxides
Zirconia
Strength of materials
Thermal conductivity
Porosity
Lanthanum oxides
ceramics
Superplastic deformation
Yttria stabilized zirconia
Chemical analysis
Solid solutions
Sintering
porosity
thermal conductivity
lanthanum oxides
yttria-stabilized zirconia
zirconium oxide
sintering
solid solutions

Keywords

  • Porous ceramics
  • Superplasticity
  • Thermal insulator
  • Zirconia

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanical Engineering
  • Mechanics of Materials

Cite this

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abstract = "The superplastically foaming method was adopted to make closed-pore inclusive zirconia-based ceramics. Lanthanum oxide was added to monoclinic or tetragonal yttria-stabilised zirconia to reduce the thermal conductivity of the matrix. Sintering and superplastic deformation led to a solid solution and transformation to the cubic phase. The resulting superplastically foamed porous ceramics having a porosity of 45{\%} had only 40{\%} of the thermal conductivity of the fully densified ceramics having the same composition. This value was comparable to that of conventionally fabricated porous ceramics with the same composition and porosity. The superplastically foamed ceramics had 60{\%}, while conventionally fabricated ceramics had only 20{\%}, of the mechanical strength of the fully dense ceramics.",
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AU - Okada, Masanori

AU - Teranisi, Takasi

AU - Hayashi, Hidetaka

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AB - The superplastically foaming method was adopted to make closed-pore inclusive zirconia-based ceramics. Lanthanum oxide was added to monoclinic or tetragonal yttria-stabilised zirconia to reduce the thermal conductivity of the matrix. Sintering and superplastic deformation led to a solid solution and transformation to the cubic phase. The resulting superplastically foamed porous ceramics having a porosity of 45% had only 40% of the thermal conductivity of the fully densified ceramics having the same composition. This value was comparable to that of conventionally fabricated porous ceramics with the same composition and porosity. The superplastically foamed ceramics had 60%, while conventionally fabricated ceramics had only 20%, of the mechanical strength of the fully dense ceramics.

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