Effect of Co₃O₄ on the Fracture Toughness and Microstructure of Yttria-Stabilized Cubic Zirconia (8YSZ)

• Authors: B. Aktas , S. Tekeli
• Languages of publication: EN

Abstracts

EN

The effects of the addition of Co₃O₄ to yttria-stabilized zirconia (8YSZ) on fracture toughness and microstructure was investigated using micro-indentation and scanning electron microscopy (SEM). Undoped and 1-15 wt.% Co₃O₄-doped 8YSZ powders were prepared using a colloidal process and then pelletized under a pressure of 200 MPa. The 8YSZ specimens were sintered at 1400°C for 1 h. SEM results showed that Co₃O₄ precipitated as a secondary phase among the primary 8YSZ grains. Furthermore, because of the presence of Co₃O₄ secondary phases at the grain boundaries of 8YSZ, the grain sizes of the 8YSZ samples increased with the addition of 1-15 wt.% Co₃O₄. The fracture toughness values of the undoped and 1 wt.% Co₃O₄-doped 8YSZ were determined to be 1.64 and 2.86 MPa m^{1/2}, respectively, indicating the fracture toughness of 8YSZ increased in 1 wt.% Co₃O₄ addition. The fracture toughness of 8YSZ increased upon the addition of 1 wt.% Co₃O₄.

Keywords

EN

81.05.Je; 81.20.Ev; 81.40.Np; 82.47.Ed

Discipline

• 81.40.Np: Fatigue, corrosion fatigue, embrittlement, cracking, fracture, and failure(see also 62.20.M- Structural failure of materials)
• 82.47.Ed: Solid-oxide fuel cells (SOFC)
• 81.05.Je: Ceramics and refractories (including borides, carbides, hydrides, nitrides, oxides, and silicides)(for ceramics in electrochemistry, see 82.45.Yz)
• 81.20.Ev: Powder processing: powder metallurgy, compaction, sintering, mechanical alloying, and granulation

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2015
• Volume: 127
• Issue: 4
• Pages: 1384-1387

Dates

published

2015-04

Contributors

author

B. Aktas

• Harran University, Engineering Faculty, Mechanical Engineering Department, 63300, Sanliurfa, Turkey

author

S. Tekeli

• Gazi University, Technology Faculty, Metallurgical and Materials Engineering Department, 06500, Ankara, Turkey

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Identifiers

DOI

10.12693/APhysPolA.127.1384