Effect of MgF2 on hot pressed hydroxylapatite and monoclinic zirconia composites

Download

10.1007s10853-006-0485-x.pdf

Date

2007-06-01

Author

Evis, Zafer

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

131
views

140
downloads

Hydroxylapatite (HA) has been widely used in biomedical applications because of its excellent biocompatibility in the human body. A total of 25 wt% monoclinic (m) zirconia-HA composites (with and without 5 wt% MgF2) were synthesized to investigate their mechanical properties and phase stability. In HA-m-ZrO2 composites, HA and m-ZrO2 reacted to form CaZrO3 when there was no F- present in the composite and M-ZrO2 partially transformed to tetragonal ZrO2. When MgF2 was added into the system, it improved the thermal stability of the phases, densification, hardness, and fracture toughness of the composites and it caused the m-ZrO2 to transform completely to t-ZrO2 by incorporating the Mg2+ ions present in MgF2 in the ZrO2. Moreover, the stability of HA was improved by incorporating the F- ions from MgF2 in place of OH- ions in HA. Substitution of OH- by F- ions was verified by the change in HA's hexagonal lattice parameters. A fracture toughness of 2.0 MPa root m was calculated for the composite containing MgF2.

Subject Keywords

Mechanical Engineering, General Materials Science, Mechanics of Materials

URI

https://hdl.handle.net/11511/38494

Journal

JOURNAL OF MATERIALS SCIENCE

DOI

https://doi.org/10.1007/s10853-006-0485-x

Collections

Department of Engineering Sciences, Article

Suggestions

OpenMETU
Core

Effect of microstructural modification on damage tolerance of 34CrMo4 shaft steel Ozcan, Burak; Gurer, Goksu; Gür, Cemil Hakan (Wiley, 2020-06-01) Overall damage tolerances of the heat-treated 34CrMo4 steels having ferritic-pearlitic, bainitic, and tempered-martensitic microstructures were evaluated based on their threshold stress intensity factor prior to small crack propagation, fatigue strength, and fracture toughness under static loading. Kitagawa-Takahashi diagrams were constructed to determine the limiting size of small crack propagation. The micromechanical effects of carbide morphology and phase distribution on quasi-static and dynamic mechani...
Computational modeling of coupled cardiac electromechanics incorporating cardiac dysfunctions Berberoglu, Ezgi; Solmaz, H. Onur; Göktepe, Serdar (Elsevier BV, 2014-11-01) Computational models have huge potential to improve our understanding of the coupled biological, electrical, and mechanical underpinning mechanisms of cardiac function and diseases. This contribution is concerned with the computational modeling of different cardiac dysfunctions related to the excitation-contraction coupling in the heart. To this end, the coupled problem of cardiac electromechanics is formulated through the conservation of linear momentum equation and the excitation equation formulated in th...
Method for Dynamic Material Property Characterization of Soft-Tissue-Mimicking Isotropic Viscoelastic Materials Using Fractional Damping Models Martin, Bryn A.; Kutluay, Umit; Yazıcıoğlu, Yiğit (ASTM International, 2013-09-01) Characterization of the mechanical properties of human-tissue-mimicking silicone elastomers is important for producing accurate tissue models for experimentation. However, the viscoelastic and frequency-dependent material properties of elastomers are difficult to quantify. We present a material characterization technique for a silicone elastomer used to mimic human soft tissue based on generalized-Maxwell-type material models with and without fractional dissipating mechanisms. The silicone specimens were pr...
Impact essential work of fracture toughness of ABS/polyamide-6 blends compatibilized with olefin based copolymers Ozkoc, Guralp; Bayram, Göknur; Bayramli, Erdal (Springer Science and Business Media LLC, 2008-04-01) The impact fracture toughness of acrylonitrile-styrene-butadiene/polyamide-6 (ABS/PA6) blends compatibilized with 5% by weight carbon monoxide modified ethylene-n butyl acrylate-maleic anhydride (EnBACO-MAH) or ethylene-methyl acrylate-glycidyl methacrylate (EMA-GMA) copolymers were examined as a function of blend ratio by standard Charpy tests, Essential Work of Fracture (EWF) Methodology and fracture surface morphologies. The samples were first processed in twin-screw extruder and they were subsequently i...
Separation of butane isomers by MFI membranes synthesized in a flow system Çulfaz Emecen, Pınar Zeynep; Kalıpçılar, Halil (Elsevier BV, 2006-11-20) MFI type zeolites are the most widely studied zeolites for membrane separations. Conventionally, zeolite membranes are prepared in batch systems by hydrothermal synthesis [1–3]. This method has several disadvantages for use in industrial scale for the synthesis of membranes with large areas and complex geometries that are commonly used in membrane modules. An alternative to batch synthesis is using a flow system where the synthesis solution is flown over the support. In a flow system, much better homogeneit...

Citation Formats

Z. Evis, “Effect of MgF2 on hot pressed hydroxylapatite and monoclinic zirconia composites,” JOURNAL OF MATERIALS SCIENCE, pp. 3739–3744, 2007, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/38494.