A review on the thermal stability of calcium apatites

Tõnsuaadu, Kaia; Gross, Kārlis Agris; Plūduma, Liene; Veiderma, Mihkel

doi:10.1007/s10973-011-1877-y

Cited by 278 publications

(184 citation statements)

References 94 publications

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“…In addition, it is the most thermally stable CaPO 4 with the melting point at *1650°C (Tõnsuaadu et al 2012). Perhaps, such ''extreme'' properties of FA are related to the specific position of F -ions in the center of Ca(2) triangles of the crystal structure (Elliott 1994;White and Dong 2003).…”

Section: Fa (Or Fap)mentioning

confidence: 99%

Calcium orthophosphates (CaPO 4 ): Occurrence and properties

Dorozhkin¹

2017

Morphologie

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Section: Fa (Or Fap)mentioning

confidence: 99%

Calcium orthophosphates (CaPO 4 ): Occurrence and properties

Dorozhkin¹

2017

Morphologie

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“…Figures 8 to 10 show that the samples were converted into a new phase after sintering at 1200 o C. The amount of titanium in the mixture affected the peak intensity [45], and HA decomposed and transformed into a secondary-phase substance, such as tetracalcium phosphate and tricalcium phosphate [46]. The presence of HA in the secondary phase wasevident not only under atmospheric conditions, but also in vacuum conditions [41].…”

Section: X-ray Diffractionmentioning

confidence: 96%

Porous titanium alloy/hydroxyapatite composite using powder compaction route

Arifin¹,

Sulong²,

Fun³

et al. 2017

J. MECH. ENG. SCI.

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Titanium alloys (Ti6Al4V) and hydroxyapatite (HA) are widely used as implant materials. Ti6Al4V has good mechanical properties and corrosion resistance, whereas HA has excellent biocompatibility but its mechanical properties are weak. The combination of properties between Ti6Al4V and HA is expected to produce a superior material for bio-implants. The aim of this work is to analyse the fabricating porous Ti6Al4V/HA composite through powder compaction with the application of two types of space holders. Sodium chloride (NaCl) and polymethyl methacrylate (PMMA) were selected as the space holder agents. Space holders were removed by solvent debinding (NaCl) and thermal debinding (PMMA). Sintering was performed in a furnace at 1200 °C for 1.5 h. The Archimedes method was carried out to obtain the porosity of the sintered body. Samples where NaCl was used exhibited higher porosity than the samples where for PMMA was used. The high porosity achieved among the successfully sintered samples was 43.9%. Interconnected porous was clearly observed on the sintered composites with a successfully generated size range of 2 μm to 25 μm.

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“…The second one and last one are associated with dehydration-crystallization. These processes have been studied by other authors [38][39][40]. However, practically no efort has been dedicated to study the inluence of the experimental conditions used for the thermal decomposition on the morphology of the inal products.…”

Section: Characterization Of the Powders Of Hydroxyapatitementioning

confidence: 99%

Controlled Rate Thermal Analysis (CRTA) as New Method to Control the Specific Surface in Hydroxyapatite Thin Coatings

Peón¹,

hadad²,

García-Galván³

et al. 2017

Modern Technologies for Creating the Thin-Film Systems and Coatings

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The control of the texture in synthetic hydroxyapatite ceramics had limited their application in the ield of the materials for bone implantation, even more when it is used as a illing in cements and other formulations in orthopedic surgery. The present article shows preliminary results demonstrating the efectiveness of a modiication of the controlled rate thermal analysis (CRTA), developed by J. Rouquerol, used for the preparation of ceramic materials with controlled textural characteristics, during the formation of ceramic powders of synthetic hydroxyapatite at low temperatures. The thermal treatments of the hydroxyapatite were carried out in a device connected to a computer, to control temperature and pressure system, keeping the decomposition speed constant. Results, reported when preparing ceramic powders of hydroxyapatite at 300 and 850°C under controlled pressure, using synthetic hydroxyapatite with a Ca/P molar ratio equal to 1.64, were checked using IR spectroscopy and X-ray difraction, showed that the formed phase corresponds to that of crystalline hydroxyapatite, even at 300°C of maximum temperature. Values of speciic surface (BET) between 17 and 66 m 2 /g, with pore size in the range of 50-300 Å in both cases are obtained by N 2 absorption isotherms, when analyzing the isotherms of nitrogen absorption.

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A review on the thermal stability of calcium apatites

Cited by 278 publications

References 94 publications

Calcium orthophosphates (CaPO 4 ): Occurrence and properties

Calcium orthophosphates (CaPO 4 ): Occurrence and properties

Porous titanium alloy/hydroxyapatite composite using powder compaction route

Controlled Rate Thermal Analysis (CRTA) as New Method to Control the Specific Surface in Hydroxyapatite Thin Coatings

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