Calcium phosphate apatites with variable Ca/P atomic ratio II. Calcination and sintering

Raynaud, Sylvie; Champion, Éric; Bernache‐Assollant, Didier

doi:10.1016/s0142-9612(01)00219-8

Cited by 202 publications

(131 citation statements)

References 10 publications

Supporting

Mentioning

116

Contrasting

Unclassified

Order By: Relevance

“…Up to 600°C calcined powders, most of the lines corresponding to HA were matching with the standard JCPDS (File No 74-0566) and the spectrum contains noisy background which could be due to glassy phosphate matrix. Similar observations were also explained in the literatures confirming the synthesized powders to be apatitic when the Ca/P ratio is in the range of 1.50-1.67 [11]. However, high temperature calcined powders spectra were found to be more sharpen and less noisy due to well crystallized phases.…”

Section: Resultssupporting

confidence: 90%

“…Decrease in strength beyond 1100°C could be due to allotropic transformation of TCP phase from β→α and the α phase is reported to be a brittle phase. This allotropic transformation occurred at 1150°C and the reverse transformation was not totally achieved during cooling [11]. Typical fractured surfaces of samples sintered at different temperatures are shown in Fig.…”

Section: Biaxial Flexural Strength Of the Sintered Bodies And Fractogmentioning

confidence: 99%

“…It was concluded that presence of high amount of TCP was detrimental to the sintering of biphasic HA/TCP ceramics [11]. In another investigation [12] in order to avoid grain growth and improve densification, calcium deficient HA powders were hot pressed at 1100°C to produce dense HA/TCP biphasic materials.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Synthesis and sintered properties evaluation of calcium phosphate ceramics

Pattanayak

Dash

Prasad

et al. 2007

Materials Science and Engineering: C

View full text Add to dashboard Cite

Section: Resultssupporting

confidence: 90%

Section: Biaxial Flexural Strength Of the Sintered Bodies And Fractogmentioning

confidence: 99%

See 1 more Smart Citation

Synthesis and sintered properties evaluation of calcium phosphate ceramics

Pattanayak

Dash

Prasad

et al. 2007

Materials Science and Engineering: C

View full text Add to dashboard Cite

“…Raynaud et al 10) reported (Table 1). Kohri et al 1) investigated the in-vitro stability of BCP ceramics in phosphatebuffered Ringer's solution (PBRS) composed of NaCl, KCl, and Na 2 HPO 4 .…”

Section: Discussionmentioning

confidence: 97%

Effect of Varying HAP/TCP Ratios in Tape-cast Biphasic Calcium Phosphate Ceramics on Response In Vitro

Tanimoto

Shibata

Murakami

et al. 2009

J. Hard Tissue Biology.

View full text Add to dashboard Cite

The in-vitro response of the biphasic calcium phosphate (BCP) ceramics hydroxyapatite (HAP) and β-tricalcium phosphate (TCP) prepared by tape-casting was investigated. BCP ceramic slurries were prepared to HAP/β-TCP weight ratios of 75/25 (H75-T25), 50/50 (H50-T50), and 25/75 (H25-T75). Additionally, 100% HAP (H100) and 100% β-TCP (T100) were prepared as control. BCP ceramic sheets fabricated by tape-casting were sintered at 1200ºC for 4 h. After sintering at 1200ºC, thin-film X-ray diffraction confirmed that β-TCP in the BCP ceramics was partially transformed to α-TCP; HAP showed no change. Field-emission scanning electron microscope observation showed that the surfaces of H25-T75 and T100 were completely covered with precipitate after 90 d' immersion in phosphate-buffered saline solution with pH 7.4 at 37ºC. After osteoblastlike (MC3T3-E1) cell cultivation for 7 d, H25-T75 showed a significantly higher cell number than H100, H75-T25, and H50-T50 (Fisher's PLSD test, p<0.05). These results indicate that the determination of an optimal balance of biological stability and biodegradation rate is important to fabricating BCP ceramics because it directly affects the in-vitro response. Within the limitation of this study, it is concluded that BCP ceramics with a HAP/TCP ratio of 25/75 prepared by a tape-casting technique has high cellular activity.

show abstract

“…Coming from different fields, Raynaud et al 13 and Tarutis 14 independently note that the two approaches are actually equivalent, with the exponent of the power law in time being related to the order of the nth-order reaction by n = 1+1/ν. Reaction order is commonly interpreted in geometric terms, e.g., shrinking-core reactions are described by n < 1.…”

Section: Sintering Modelsmentioning

confidence: 99%

An nth-order Gaussian energy distribution model for sintering

Burnham

2005

Chemical Engineering Journal

View full text Add to dashboard Cite

Although it is well known that the rate of sintering is governed by deceleratory kinetics, it is often difficult to fit power-law and nth-order reaction models over broad timetemperature ranges. This work shows that a phenomenological model combining a reaction order with an activation energy distribution can correlate surface area as a function of sintering time and temperature over a greater range of those variables.Qualitatively, the activation energy distribution accounts the dependence of free energy on particle size and material defects, while the reaction order accounts for geometric factors such as a distribution of diffusion lengths. The model is demonstrated for sintering of hydroxyapatite using data of Bailliez and Nzihou (Chem. Eng. J. 98 (2004), 141-152).

show abstract

Calcium phosphate apatites with variable Ca/P atomic ratio II. Calcination and sintering

Cited by 202 publications

References 10 publications

Synthesis and sintered properties evaluation of calcium phosphate ceramics

Synthesis and sintered properties evaluation of calcium phosphate ceramics

Effect of Varying HAP/TCP Ratios in Tape-cast Biphasic Calcium Phosphate Ceramics on Response In Vitro

An nth-order Gaussian energy distribution model for sintering

Contact Info

Product

Resources

About