The Production and Characterisation of a Hydroxyapatite Ceramic Material

Santos, JD; Morrey, S.; Hastings, G.W.; Monteiro, F.J.

doi:10.1016/b978-0-7506-0269-3.50014-1

Cited by 10 publications

(15 citation statements)

References 6 publications

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“…The dehydroxylation phenomenon observed for the CPS-HA is consistent with the findings of other workers (Wang and Chaki, 1993;Gu et al, 2002;Kijima and Tsutsumi, 1979;Santos et al, 1991;Zhou et al, 1993;Ruys et al, 1995). Although the dehydroxylation phenomenon in HA is still unclear, a general consensus that has been reached in the reported literatures is that dehydroxylation neither collapse the HA structure nor is responsible for the declined in mechanical properties when sintered at elevated temperatures.…”

Section: Ha Phase Stabilitysupporting

confidence: 91%

Densification behaviour of nanocrystalline hydroxyapatite bioceramics

Ramesh

Tan

Bhaduri

et al. 2008

Journal of Materials Processing Technology

111

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Section: Ha Phase Stabilitysupporting

confidence: 91%

Densification behaviour of nanocrystalline hydroxyapatite bioceramics

Ramesh

Tan

Bhaduri

et al. 2008

Journal of Materials Processing Technology

111

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“…5,6 The effect of the atmosphere, duration, and especially sintering temperature were studied in the dependence. [7][8][9][10][11] It was revealed that the processes of dehydroxylation and recrystallization resulted in a pressing simultaneously with the densification at the usually used sintering temperatures of 1100-1300°C.…”

Section: Introductionmentioning

confidence: 99%

“…3,10 As a result, the strength properties of the ceramic became substantially poorer. 5,7,10 Based on the data, it can be expected that the strength characteristics of an HA ceramic will improve, when obtained with a density close to the theoretical, at a sintering temperature less than 1100°C, when the effect of the processes noted above is insignificant. 12 The temperature of active sintering mainly depends on the physical-chemical characteristics: dispersity, morphology, structural state, and conditions of the preliminary thermal treatment (calcination) of a starting powder.…”

Section: Introductionmentioning

confidence: 99%

Sintering peculiarities for hydroxyapatite with different degrees of crystallinity

Zyman

Ivanov

Rochmistrov

et al. 2000

J. Biomed. Mater. Res.

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It has been shown that reduction of sintering temperature of hydroxyapatite is connected to the use of a powder, the particles of which consist of crystalline and amorphous-like constituents. Shrinkage of the pressings made of the powder starts at the middle temperatures (600-700 degrees C) and is realized by a mechanism of a mutual sliding of the particles. If the firing temperature of the pressings increases, the second stage, realized by a diffusion mechanism (over approximately 900 degrees C), begins. A shrinkage curve on the sliding stage has a stepped character. It is caused by a stopping effect on the shrinkage of the pressure of a gas, which is exuded as a result of crystallization of the amorphous-like constituent, and partly accumulates in closed cavities and pores. The contribution of the two mechanisms to the shrinkage process is determined by the degree of crystallinity of the powder (i.e. the ratio of the crystalline and the amorphous-like constituents). If a powder has a higher degree of crystallinity, higher temperatures result, and the stepped character of the shrinkage curve is smoothed. The sliding stage is practically lacking for pressings of crystalline powder, and a noticeable shrinkage starts at high temperatures (over approximately 900 degrees C) as diffusive processes develop.

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“…This work was conducted using a CO 2 Two sets of laser processing experiments were conducted. The first set of experiments were carried out in order to determine the minimum threshold fluence, the absorption length and to examine the thermal loading characteristics of the alpha-alumina.…”

Section: Methodsmentioning

confidence: 99%

“…Nevertheless, its excellent in vivo corrosion and wear resistance afford it high usage. In contrast, application of bioactive ceramics and glasses which are capable of sustaining, and perhaps promoting, tissue bonding remain limited on account of their tendency to fracture under load-bearing conditions [2,3]. Clearly it would be highly beneficial if some degree of bioactivity could be induced into alpha-alumina since it is eminently the implant material of choice.…”

Section: Introductionmentioning

confidence: 99%

An analysis of the beam interaction characteristics of selected lasers with an alpha-alumina bioceramic

Lawrence

2004

Optics and Lasers in Engineering

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Certain differences between the interaction characteristics of a CO 2 laser, a Nd:YAG laser and a high power diode laser (HPDL) with an alpha-alumina bioceramic have been investigated. For each laser the fluence threshold values at which significant material removal occurs were found graphically.Through the implementation of a derivative of Beer-Lambert's law, the laser beam absorption lengths were calculated along with the thermal loading values. An examination of the laser induced meltpool propagation in the alpha-alumina revealed good agreement with the Stefan solution to the heat diffusion equation for the lasers. Absorptivity measurements revealed that there was no correlation between the actual absorptivity of the alpha-alumina and the absorption length for each of the three lasers on account of the absorptivity measurements being similar for each laser. However, differences in the depth of melting experienced by the alpha-alumina meant that it is reasonable to assume that absorption length is the principal influence on the melt depth.

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The Production and Characterisation of a Hydroxyapatite Ceramic Material

Cited by 10 publications

References 6 publications

Densification behaviour of nanocrystalline hydroxyapatite bioceramics

Densification behaviour of nanocrystalline hydroxyapatite bioceramics

Sintering peculiarities for hydroxyapatite with different degrees of crystallinity

An analysis of the beam interaction characteristics of selected lasers with an alpha-alumina bioceramic

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