Influence of a grain-locking morphology on properties of doped ZrO2 ceramics made with ultrafine (~ 3 nm) nanoparticles
The use of ultrafine (~ 3 nm) nanoparticles of 10 mol.% CaO-doped ZrO 2 together with a minimum dwelling time (15 min.) during pressureless sintering yielded high (> 99%)-density ceramic with a unique grain-locking microstructure; no impurity or second phase segregation was observed in the ‘locke...
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Published in | Journal of materials research Vol. 37; no. 23; pp. 4255 - 4267 |
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Main Authors | , , |
Format | Journal Article |
Language | English |
Published |
Cham
Springer International Publishing
14.12.2022
Springer Nature B.V |
Subjects | |
Online Access | Get full text |
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Summary: | The use of ultrafine (~ 3 nm) nanoparticles of 10 mol.% CaO-doped ZrO
2
together with a minimum dwelling time (15 min.) during pressureless sintering yielded high (> 99%)-density ceramic with a unique grain-locking microstructure; no impurity or second phase segregation was observed in the ‘locked’ regions. Although the normal X-ray diffraction data indicated a phase-pure cubic symmetry for the ceramic, Rietveld analysis confirmed a cubic-phase majority (~ 83%) with minor tetragonal content (~ 17%). The microstructure (homogeneously present on both top and interior of ceramics) for the sintered ceramics contributed in achieving high hardness (~ 14 GPa); obtained hardness and indentation toughness values were also comparable to the previously reported cubic ZrO
2
ceramics (doped with Y
2
O
3
). Considering the high cost of yttria-doped zirconia systems, the suitability with mechanical properties together with high sintered density for the present system suggests its potential usability at larger scales as an alternative to Y
2
O
3
-stabilized zirconia ceramics.
Graphical abstract |
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ISSN: | 0884-2914 2044-5326 |
DOI: | 10.1557/s43578-022-00792-y |