Hot-pressed hydroxylapatite/monoclinic zirconia composites with improved mechanical properties

Date

2007-04-01

Author

Evis, Zafer

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Composites of hydroxylapatite (HA) and monoclinic zirconia were hot-pressed at 1100 degrees C and 1200 degrees C under vacuum to study the phase transformations and the mechanical properties. X-ray diffraction results showed a higher phase transformation from monoclinic-ZrO2 to tetragonal-ZrO2 when the sintering temperature increased from 1100 degrees C to 1200 degrees C. HA decomposed faster when the amount of ZrO2 in the composites increased. Moreover, small amount of alpha-TCP and CaZrO3 was observed in the composites hot-pressed at 1200 degrees C. Hot-pressing at 1100 degrees C resulted in better mechanical properties than the hot-pressing at 1200 degrees C because of less reaction between HA and zirconia at 1100 degrees C. 40 wt% monoclinic zirconia and HA composite hot-pressed at 1100 degrees C resulted in promising mechanical properties which are 6.5 GPa of Vickers mu-hardness, 2.23 MPa root m of fracture toughness, and 66 MPa of diametral strength.

Subject Keywords

Mechanical Engineering, General Materials Science, Mechanics of Materials

URI

https://hdl.handle.net/11511/43066

Journal

JOURNAL OF MATERIALS SCIENCE

DOI

https://doi.org/10.1007/s10853-006-1299-6

Collections

Department of Engineering Sciences, Article

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Citation Formats

Z. Evis, “Hot-pressed hydroxylapatite/monoclinic zirconia composites with improved mechanical properties,” JOURNAL OF MATERIALS SCIENCE, pp. 2426–2431, 2007, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/43066.