Effect of La2O3 addition and sintering mode on the mechanical properties and microstructural evolution on an 8YSZ ceramic alloy

A. Muthuchamy, Nidhi Nagaraju, Dinesh K. Agrawal, A. Raja Annamalai

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Abstract

In this research, the influence of La2O3 addition on the microstructure, phase stability and mechanical properties of 8 mol% yttria stabilized zirconia (8YSZ) was studied. 8YSZ with La2O3 (9, 12 and 15 wt%) ceramics were fabricated by microwave and conventional sintering at 1400 °C/ 20 min and 1400 °C/ 5 h, respectively. Irrespective of the sintering technique, the relative sintered density was found to decrease with increasing amount of La2O3. The grain growth of 8YSZ was enhanced significantly by the addition of La2O3. The XRD results demonstrated that addition of La2O3 up to 15 wt% did not disrupt the cubic 8YSZ phase regardless of sintering technique; additionally evolution of pyrochlore phase, La2Zr2O7 was observed in all sintered specimens. Vickers hardness of 8YSZ ceramic compacts were also found to decrease with increasing amount of La2O3.

Original languageEnglish (US)
Pages (from-to)3668-3674
Number of pages7
JournalCeramics International
Volume45
Issue number3
DOIs
StatePublished - Feb 15 2019

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Process Chemistry and Technology
  • Surfaces, Coatings and Films
  • Materials Chemistry

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