Behavior of sintered body properties of hydroxyapatite ceramics: effect of uniaxial pressure on green body fabrication

Indra, Ade; Putra, A. B. N. R.; Handra, Nofriady; Fahmi, Hendriwan; Nurzal,; Asfarizal,; Perdana, Mastariyanto; Anrinal,; Subardi, Adi; Affi, Jon; Gunawarman, B.

doi:10.1016/j.mtsust.2021.100100

Cited by 8 publications

(5 citation statements)

References 44 publications

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“…Moreover, the relative density increases by increasing uniaxial pressure between 10 and 40 MPa. At pressures between 40 and 190 MPa, the relative density tends to be constant [ 39 ]. Increased pressure during hot compression resulted in an increased melt flow index (MFI), crystallinity, density, ultimate tensile strength (UTS), and Young’s modulus of the PP-HA biocomposite.…”

Section: Methodsmentioning

confidence: 99%

Characterization of PLA/PCL/Nano-Hydroxyapatite (nHA) Biocomposites Prepared via Cold Isostatic Pressing

et al. 2023

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Hydroxyapatite has the closest chemical composition to human bone. Despite this, the use of nano-hydroxyapatite (nHA) to produce biocomposite scaffolds from a mixture of polylactic acid (PLA) and polycaprolactone (PCL) using cold isostatic pressing has not been studied intensively. In this study, biocomposites were created employing nHA as an osteoconductive filler and a polymeric blend of PLA and PCL as a polymer matrix for prospective usage in the medical field. Cold isostatic pressing and subsequent sintering were used to create composites with different nHA concentrations that ranged from 0 to 30 weight percent. Using physical and mechanical characterization techniques such as Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), scanning electron microscopy (SEM), and density, porosity, tensile, and flexural standard tests, it was determined how the nHA concentrations affected the biocomposite’s general properties. In this study, the presence of PLA, PCL, and nHA was well identified using FTIR, XRD, and SEM methods. The biocomposites with high nHA content showed intense bands for symmetric stretching and the asymmetric bending vibration of PO43−. The incorporation of nHA into the polymeric blend matrix resulted in a rather irregular structure and the crystallization became more difficult. The addition of nHA improved the density and tensile and flexural strength of the PLA/PCL matrix (0% nHA). However, with increasing nHA content, the PLA/PCL/nHA biocomposites became more porous. In addition, the density, flexural strength, and tensile strength of the PLA/PCL/nHA biocomposites decreased with increasing nHA concentration. The PLA/PCL/nHA biocomposites with 10% nHA had the highest mechanical properties with a density of 1.39 g/cm3, a porosity of 1.93%, a flexural strength of 55.35 MPa, and a tensile strength of 30.68 MPa.

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Section: Methodsmentioning

confidence: 99%

Characterization of PLA/PCL/Nano-Hydroxyapatite (nHA) Biocomposites Prepared via Cold Isostatic Pressing

et al. 2023

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“…The higher green density leads to the higher shrinkage [85]. Second, the lowest shrinkage value occurred at the highest uniaxial pressure because the density between the powders was perfect in the green bodies, so the sintering process did not require high shrinkage to form grain bonds in the sintered bodies [86]. The shrinkage behaviour of HAbased composites is affected by the differential shrinkage behaviour of the various component phases that occurs between the HA and dopant materials [87].…”

Section: Resultsmentioning

confidence: 99%

Evaluation of the Potential of Barium Zirconate on the Sinterability and Properties of Bovine Hydroxyapatite

Pazarlıoğlu¹

2023

Ceramics - Silikaty

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In the present study, the potential of barium zirconate (BaZrO 3 ; 1-5 wt. %) on the sinterability, and properties of bovine hydroxyapatite (BHA) was evaluated. BHA decomposed into beta and alpha-tricalcium phosphate (β and α-TCP) at a 4.7 % rate. Tetracalcium phosphate (TTCP) was detected as the decomposition phase in the BaZrO 3 added BHAs, and it increased up to 10.7 % with an increasing BaZrO 3 ratio. In addition to TTCP, the phases of BaZrO 3 , Ba 2 ZrO 4 , σ-Ba 2 P 2 O 7 , Ba 3 P 2 O 8 and CaZrO 3 were detected in the composites. The addition of BaZrO 3 at an amount of 3 wt. % has a higher potential than the others to improve the sinterability and properties of BHA. It contributed to the increase in the fracture toughness from 0.99 ± 0.13 to 1.80 ± 0.12 MPa•m 1/2 and the compressive strength from 115. 75 ± 4.27 to 173.66 ± 13.61 MPa, and the decrease in the brittleness index from 4.24 ± 0.31 to 2.45 ± 0.15 µ -1/2 . The in-vitro bioactivity of BHA also increases with the additional BaZrO 3 . However; it is recommended to be used in applications that do not require load bearing in the human body due to its insufficient fracture toughness.

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“…Pada Gambar juga dapat dilihat bahwa ukuran serbuk HA yang seragam dan kecil dari 200 nm, mirip dengan HA sintetis yang dilaporkan pada penelitian sebelumnya [10][11][12] [13] dan HA lainnya [14][15][16] Gambar 1 (b) adalah bentuk dari serbuk silika yang digunakan pada penelitian ini, serbuk silika berbentuk spherical. Pada Gambar juga dapat dilihat bahwa ukuran serbuk silika yang seragam dan kecil dari 1 µm, mirip dengan serbuk silica yang dilaporkan pada penelitian sebelumnya [17,18]…”

Section: Karakterisasi Serbuk Ha Dan Silikaunclassified

Optimalisasi Temperatur Sintering Pada Sintered Body Hidroksiapatit Dengan Penambahan Silika Sebagai Material Penguat

Febri,

Pajri,

Indra

2023

jtm

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Sintered body hydroxyapatite (HA) in the form of pellets has been made by adding silica as a reinforcing material (ratio 60:40 wt.%) by varying the sintering temperature. HA and silica were subjected to a dry mixing process for 2 h, then a wet mixing process was carried out for 2 h with the addition of PVA and alcohol as a binder. The mixing process uses a rotary drum with the addition of zirconia balls with the aim of making the mixture more homogeneous. After the mixing process, the samples were dried for 48 h to remove the alcohol contained. The green body was made using the uniaxial pressing method at a pressure of 100 MPa and held for 3 minutes. The sintering process is carried out variously at temperatures of 800°C, 900°C, 1000°C, 1100°C, 1200°C, 1300°C, and 1400°C. with a heating rate of 5ºC/minute and holding time of 4 h. Next, the temperature was lowered to 300ºC with a cooling rate of 5ºC/minute. The results showed that linear shrinkage increased significantly (weight shrinkage increased 12.83% - 25.08% and diameter shrinkage increased 3.26% - 23.21%). The results of the relative density calculation show that there is a significant increase with each variation in sintering temperature, where the increase occurs from 44.4% - 85.6%. The compressive strength value also shows an increase with increasing sintering temperature, namely from 21.2 MPa at 800 oC to 65.9 MPa at 1300 oC. Meanwhile, at a sintering temperature of 1400°C, compressive strength values decreased and oxidation occurred as evidenced by color changes. It can be concluded that the optimization of the sintering process occurs at a temperature of 1300 oC which is proven by the highest compressive strength value and no oxidation occurs.

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Behavior of sintered body properties of hydroxyapatite ceramics: effect of uniaxial pressure on green body fabrication

Cited by 8 publications

References 44 publications

Characterization of PLA/PCL/Nano-Hydroxyapatite (nHA) Biocomposites Prepared via Cold Isostatic Pressing

Characterization of PLA/PCL/Nano-Hydroxyapatite (nHA) Biocomposites Prepared via Cold Isostatic Pressing

Evaluation of the Potential of Barium Zirconate on the Sinterability and Properties of Bovine Hydroxyapatite

Optimalisasi Temperatur Sintering Pada Sintered Body Hidroksiapatit Dengan Penambahan Silika Sebagai Material Penguat

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