Synthesis and characterization of machinable calcium phosphate/lanthanum phosphate composites

Celaletdin Ergun

doi:10.1016/j.jmatprotec.2007.07.041

Synthesis and characterization of machinable calcium phosphate/lanthanum phosphate composites

Celaletdin Ergun^*

^*Corresponding author for this work

Department of Mechanical Engineering

Research output: Contribution to journal › Article › peer-review

22 Citations (Scopus)

Abstract

Hydroxylapatite (HA) and tricalcium phosphate (TCP) composites with lanthanum phosphate were prepared with pressureless air sintering at 500, 700, 900, 1100 and 1300 °C for 2 h. The composites were characterized in terms of phase stability during sintering, microstructural evaluation with XRD, SEM and machinability with simple drilling operation. At sintering temperatures higher than 700 °C, hydroxylapatite and lanthanum phosphate phases reacted and formed Ca₈La₂(PO₄)₆O₂. On the other hand, tricalcium phosphate and lanthanum phosphate composites were stable up to 1100 °C. However, partial reaction was observed during sintering at 1300 °C. As a result, tricalcium phosphate and lanthanum phosphate composites sintered at 1100 °C showed phase stability insuring weak interface. Thus, these composites fulfilled the requirement for machinability.

Original language	English
Pages (from-to)	178-184
Number of pages	7
Journal	Journal of Materials Processing Technology
Volume	199
Issue number	1
DOIs	https://doi.org/10.1016/j.jmatprotec.2007.07.041
Publication status	Published - 1 Apr 2008

Funding

This work is supported by the Scientific & Technological Research Council of Turkey-BAYG program. The author wishes to express his gratitude to Prof. John W. Halloran (Department of Materials Science and Engineering, the University of Michigan, Ann Arbor, USA) for his valuable contributions.

Funders
Consejo Nacional para Investigaciones Científicas y Tecnológicas

Keywords

Biomaterials
Composites
Hydroxylapatite
Lanthanum phosphate
Machinable ceramics
Tricalcium phosphate

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10.1016/j.jmatprotec.2007.07.041

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title = "Synthesis and characterization of machinable calcium phosphate/lanthanum phosphate composites",

abstract = "Hydroxylapatite (HA) and tricalcium phosphate (TCP) composites with lanthanum phosphate were prepared with pressureless air sintering at 500, 700, 900, 1100 and 1300 °C for 2 h. The composites were characterized in terms of phase stability during sintering, microstructural evaluation with XRD, SEM and machinability with simple drilling operation. At sintering temperatures higher than 700 °C, hydroxylapatite and lanthanum phosphate phases reacted and formed Ca8La2(PO4)6O2. On the other hand, tricalcium phosphate and lanthanum phosphate composites were stable up to 1100 °C. However, partial reaction was observed during sintering at 1300 °C. As a result, tricalcium phosphate and lanthanum phosphate composites sintered at 1100 °C showed phase stability insuring weak interface. Thus, these composites fulfilled the requirement for machinability.",

keywords = "Biomaterials, Composites, Hydroxylapatite, Lanthanum phosphate, Machinable ceramics, Tricalcium phosphate",

author = "Celaletdin Ergun",

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N2 - Hydroxylapatite (HA) and tricalcium phosphate (TCP) composites with lanthanum phosphate were prepared with pressureless air sintering at 500, 700, 900, 1100 and 1300 °C for 2 h. The composites were characterized in terms of phase stability during sintering, microstructural evaluation with XRD, SEM and machinability with simple drilling operation. At sintering temperatures higher than 700 °C, hydroxylapatite and lanthanum phosphate phases reacted and formed Ca8La2(PO4)6O2. On the other hand, tricalcium phosphate and lanthanum phosphate composites were stable up to 1100 °C. However, partial reaction was observed during sintering at 1300 °C. As a result, tricalcium phosphate and lanthanum phosphate composites sintered at 1100 °C showed phase stability insuring weak interface. Thus, these composites fulfilled the requirement for machinability.

AB - Hydroxylapatite (HA) and tricalcium phosphate (TCP) composites with lanthanum phosphate were prepared with pressureless air sintering at 500, 700, 900, 1100 and 1300 °C for 2 h. The composites were characterized in terms of phase stability during sintering, microstructural evaluation with XRD, SEM and machinability with simple drilling operation. At sintering temperatures higher than 700 °C, hydroxylapatite and lanthanum phosphate phases reacted and formed Ca8La2(PO4)6O2. On the other hand, tricalcium phosphate and lanthanum phosphate composites were stable up to 1100 °C. However, partial reaction was observed during sintering at 1300 °C. As a result, tricalcium phosphate and lanthanum phosphate composites sintered at 1100 °C showed phase stability insuring weak interface. Thus, these composites fulfilled the requirement for machinability.

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KW - Composites

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KW - Lanthanum phosphate

KW - Machinable ceramics

KW - Tricalcium phosphate

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Synthesis and characterization of machinable calcium phosphate/lanthanum phosphate composites

Abstract

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Keywords

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