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Mechanical Properties of Nanocrystalline Tetragonal Zirconia Stabilized with CaO, MgO and Y_2O_3

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Sahin O., Demirkol İ., Göcmez H., Tuncer M., Ali Cetinkara H., Salih Güder H., Sahin E., Rıza Tuncdemir A.

Acta Physica Polonica A

2013

vol. 123

issue 2

296-298

The citrate gel method, similar to the polymerized complex method, was used to synthesize homogeneous tetragonal zirconia at 1000°C. Nanocrystalline tetragonal phase has been fully stabilized at wide temperature range with 10 mol.% CaO, MgO, and Y_2O_3 addition. Scanning electron microscopy, X-ray diffraction, and microhardness tests are used to characterize synthesized materials. The grain size and dislocation density were calculated from X-ray diffraction data. The examined material exhibits indentation size effect behavior. Results revealed that the Vickers and Knoop microhardness are dependent on indentation test load. Geometrically necessary dislocation model and modified proportional resistance model are used to analyze the load dependence of the microhardness. The highest hardness values were obtained for the samples with CaO addition; however the lowest values were acquired for sample stabilized with Y_2O_3 by using both Knoop and Vickers techniques. This situation might be explained using the Hall-Petch relation.

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1 Acta Physica Polonica A

1 2013

1 Ali Cetinkara H.

1 Demirkol İ.

1 Göcmez H.

1 Rıza Tuncdemir A.

1 Sahin E.

1 Sahin O.

1 Salih Güder H.

1 Tuncer M.

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Mechanical Properties of Nanocrystalline Tetragonal Zirconia Stabilized with CaO, MgO and Y_2O_3