New Processing Technique for Hydroxyapatite Ceramics by the Hydrothermal Hot‐Pressing Method

Hosoi, Kazuyuki; Hashida, Toshiyuki; Takahashi, Hideaki; Yamasaki, Nakamichi; Korenaga, T.

doi:10.1111/j.1151-2916.1996.tb09048.x

Cited by 64 publications

(33 citation statements)

References 14 publications

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“…The maximum tensile strength values for the MgHA3 precursors (6 mol % Mg, nominal average size of 20 nm) are consistent with those reported for the densification of HA pellets under HHP conditions reported in the literature [25,27]. Based on these results, we suggest that the tensile strength attained for MgHA powders resulted from the cohesion and packing of particles during the dissolution-recrystallisation mechanism under HHP densification conditions.…”

Section: Microstructural Aspects and Mechanical Strength Of Mgha Compsupporting

confidence: 79%

“…Some studies have focused on the selection of the solvent medium and its concentration to obtain in-situ crystallisation of elongated submicron-sized HA crystals using mixtures of Ca(OH) 2 with either dibasic calcium phosphate dihydrate (DCPD) [19] or octacalcium phosphate (OCP) [26] as precursors. Few studies have reported that after reacting these compounds with water and ammonia solutions, HA crystals grow perpendicularly in the direction of the applied loading pressure, producing a dense lamellar microstructure with high tensile strength [19,27]. Recently, the chemical reactivity of pure and calcium deficient submicron-sized HA powders with water under HHP conditions was examined using 10 to 20 wt% of water, temperatures between 100 and 200 ºC, and loading pressures between 15 and 60 MPa for reaction intervals between 12 and 24 h [20].…”

Section: Introductionmentioning

confidence: 99%

“…In recent years, many efforts have been made to improve the densification of HA particles [18][19][20][21][22][23][24][25]27]. …”

Section: Introductionmentioning

confidence: 99%

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Low-temperature densification of Mg-doped hydroxyapatite fine powders under hydrothermal hot processing conditions

Montoya-Cisneros

Rendón-Ángeles

Matamoros-Veloza

et al. 2017

Ceramics International

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Abstract:Densification of calcium hydroxyapatite fine powders doped with different concentrations of Mg (2, 4 and 6 mol % Mg, MgHA) was successfully achieved for the first time in a nearly fully dense state using the 2 hydrothermal hot pressing (HHP) technique at low temperatures. Consolidation of MgHA powders was studied under different temperatures (150-240 ºC), reaction times (1-6 h), and powder particle size (20 nm-1.5 m). X-Ray diffraction analyses indicated that the particle densification under HHP conditions proceeded without any variation in the crystalline structure and regardless of the Mg content. The results from this work showed that an increase in temperature accelerates the reaction between MgHA particles and water (solvent) mixed during the hydrothermal treatment. Particle packing associated with bulk densification was achieved through a massive dissolution-recrystallisation mechanism, which induced the formation of small particles that rapidly crystallised on the surface of the partially dissolved original MgHA particles. The optimum conditions to obtain pellets with a high apparent density of 3.0758 ± 0.001 g/cm 3 and tensile strength value of 12.6 ± 0.6 MPa were 10 wt% of water at a temperature of 240 ºC with a 6 h reaction time and 6 mol % of Mg (MgHA3). The use of the HHP technique coupled with the fine particle size and reactivity of the MgHA precursor powders with water allowed us to produce disks that were compacted to a nearly full dense state with a low content of open porosity of 2.0 %.

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Section: Microstructural Aspects and Mechanical Strength Of Mgha Compsupporting

confidence: 79%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Low-temperature densification of Mg-doped hydroxyapatite fine powders under hydrothermal hot processing conditions

Montoya-Cisneros

Rendón-Ángeles

Matamoros-Veloza

et al. 2017

Ceramics International

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“…However, pores resulting from this method are often irregular in size and shape and not fully interconnected with one another. [415]. In another approach, bi-continuous water-filled microemulsions have been used as pre-organized systems for the fabrication of needle-like frameworks of crystalline HA (2 °C, 3 weeks) [416,417].…”

Section: Porositymentioning

confidence: 99%

Untitled

2011

BIO

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In the late 1960's, a strong interest was raised in biomedical applications of ceramic materials (named bioceramics a little bit later). Bioceramics was initially used as reasonable alternatives to metals in order to increase their biocompatibility. However, within a short period, it has grown into a diverse class of biomaterials, presently including three essential types: relatively bioinert, bioactive (or surface reactive) and bioresorbable bioceramics. This review is limited to bioceramics prepared from calcium orthophosphates only, which belong to the categories of bioactive and bioresorbable compounds. There have been a number of important advances in this field during the past 30 -40 years. The research was shifted from an initial study on the develop-ment of bioinert bioceramics towards bioactive and bioresorbable bioceramics, and these different types of calcium orthophosphate bioceramics can be tuned through the structural and compositional control. At the turn of the millennium, a new concept of calcium orthophosphate bioceramics has been developed to promote a regeneration of bones. Current biomedical applications of calcium orthophosphate bioceramics include artificial replacements for hips, knees, teeth, tendons and ligaments, as well as repair for periodontal disease, maxillofacial reconstruction, augmenttation and stabilization of the jawbone, spinal fusion and bone fillers after tumor surgery. Potential future applications of calcium orthophosphate bioceramics are demonstrated in drug delivery systems, effective carriers of growth factors, bioactive peptides and/or various types of cells for tissue engineering purposes.

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“…It is known that the water of crystallization in calcium hydrogen phosphate dihydrate (CaHPO 4 ・2H 2 O; DCPD) is slowly lost below 100˚C [Peelen et al, 1991]. If the released water can be utilized as a reaction solvent during the HHP treatment, it is to be expected that the joining HA to metal can be achieved simultaneously under the hydrothermal condition, in addition to the synthesis and solidification of HA through the chemical reaction as follows [Hosoi et al, 1996]: 6CaHPO 4 ・2H 2 O + 4Ca(OH) 2 → Ca 10 (PO 4 ) 6 (OH) 2 + 18H 2 O…”

Section: Introductionmentioning

confidence: 99%

Porous Apatite Coating on Various Titanium Metallic Materials via Low Temperature Processing

Onoki¹

2011

Biomaterials Science and Engineering

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New Processing Technique for Hydroxyapatite Ceramics by the Hydrothermal Hot‐Pressing Method

Cited by 64 publications

References 14 publications

Low-temperature densification of Mg-doped hydroxyapatite fine powders under hydrothermal hot processing conditions

Low-temperature densification of Mg-doped hydroxyapatite fine powders under hydrothermal hot processing conditions

Untitled

Porous Apatite Coating on Various Titanium Metallic Materials via Low Temperature Processing

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