Development of Triphasic Calcium Phosphate–Carbon Nanotubes (HA/TCP-CNT) Composite: A Preliminary Study

Gunawan,; Sopyan, Iis; Nurfaezah, S.; Ammar, M. R.

doi:10.4028/www.scientific.net/kem.531-532.258

Cited by 5 publications

(4 citation statements)

References 9 publications

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“…This indicated that the BCP ceramics interacted strongly with the SBF. The reabsorption behaviour was highly dependent on the β-TCP/HA ratio, the higher β-TCP/HA ratio, the greater reabsorption and surface properties appear to exert the greatest influence on reabsorption [38]. Figure 7d shows a thin CaP layer partially covering on the surface because the reabsorption was less pronounced (lower β-TCP/HA ratio).…”

Section: Resultsmentioning

confidence: 98%

“…The reduction of densification in the HA ceramics causes slower grain growth and an average grain size over 0.4 µm is obtained [37]. The mean HV value of the HA800 (4.86 ± 0.19 GPa) is considerably higher than for the conventionally sintered samples (1.98 GPa) at lower temperature [38]. Figure 6 shows the SEM images of cross sections of the HA samples after soaking in SBF for 7 days.…”

Section: Resultsmentioning

confidence: 99%

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Microstructure-property relations of biphasic calcium phosphate obtained by hot pressing process

Kulpetchdara

Limpichaipanit

Randorn

et al. 2019

PAC

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Biphasic calcium phosphate (BCP) was fabricated through hot pressing process from hydroxyapatite (HA) starting powder synthesized by a peroxide-based precipitation method and dried at 250°C. The synthesized HA powder contained some calcium hydrogen phosphate (CHP) as a minor phase. In this work, the dense BCP ceramics with a mixture of HA and β-TCP phases were successfully obtained by hot pressing at temperature ranging from 700-1100°C. The amount of HA phase in the hot pressed samples decreased with increasing sintering temperature from 700 to 900°C, while the amount of β-TCP exhibited an opposite trend. The relations between the microstructure and mechanical properties of the dense BCP ceramics sintered in the temperature range 700-1100°C were investigated. The sample hot pressed at 800°C has a dense structure with the highest hardness (4.86 ± 0.19 GPa) and the lowest fracture toughness (0.80 ± 0.01 MPa•m 1/2). In addition, biocompatibility of apatite layer formed after immersion in simulated body fluid (SBF) for 14 days can be observed by SEM images. The results revealed that the samples hot-pressed at 800 and 900°C were covered by calcium phosphate (CaP) crystal layer indicating the strong interaction of BCP ceramics and SBF.

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Section: Resultsmentioning

confidence: 98%

Section: Resultsmentioning

confidence: 99%

Microstructure-property relations of biphasic calcium phosphate obtained by hot pressing process

Kulpetchdara

Limpichaipanit

Randorn

et al. 2019

PAC

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“…Generally, the sintered component of HA/Ti is formed in the secondary phase [41][42][43][44]. 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].…”

Section: X-ray Diffractionmentioning

confidence: 99%

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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“…Hydroxyapatite (HA) and titanium are key elements in the development of medical components [7]. HA or [Ca10(PO4)6(OH)2] is a calcium phosphate ceramics currently used as a bioactive material for dental and orthopedic applications [8]. Its composition and structure is similar to those of bone, but with poor mechanical properties.…”

Section: Introductionmentioning

confidence: 99%

Effect of mixing parameters on the mixing time and density of composite HA/Ti6Al4V feedstock for powder injection molding

Arifin

Sulong

2017

MATEC Web Conf.

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Abstract. Hydroxyapatite is a bioactive material. However, Hydroxyapatite in medical application is limited by its poor mechanical properties. Titanium alloys are biocompatible materials with high specific strength and high corrosion resistance. This combination can successfully be used in biomedical applications. The mixing process is a critical stage in the metal injection molding process because it determines the quality of the metal injection product. The homogeneity of the feedstock depends on the mixing parameters used during the mixing process. An experiment was conducted using Ti6Al4V and hydroxyapatite powder as feedstock at a mixing ratio of 60:40 wt%. This feedstock was mixed with a mixture of polyethylene and palm stearin as the binder. The mixing parameters used in this study were the mixing speed (10 and 30 rpm) and the mixing temperature (130°C and 150°C) at a powder loading of 67%, as determined by the critical powder volume percentage experiment data (69.5%). Increases in the mixing speed and mixing temperature reduced the mixing time to achieve homogeneity. The combined feedstock achieved the highest density at a mixing speed of 30 rpm and a mixing temperature of 150°C.

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Development of Triphasic Calcium Phosphate–Carbon Nanotubes (HA/TCP-CNT) Composite: A Preliminary Study

Cited by 5 publications

References 9 publications

Microstructure-property relations of biphasic calcium phosphate obtained by hot pressing process

Microstructure-property relations of biphasic calcium phosphate obtained by hot pressing process

Porous titanium alloy/hydroxyapatite composite using powder compaction route

Effect of mixing parameters on the mixing time and density of composite HA/Ti6Al4V feedstock for powder injection molding

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