Property Development of Hydroxyapatite Ceramics by Two-Step Sintering

2012 ◽  
Vol 506 ◽  
pp. 190-193 ◽  
Author(s):  
S. Panyata ◽  
Sukum Eitssayeam ◽  
Gobwute Rujijanagul ◽  
Tawee Tunkasiri ◽  
Kamonpan Pengpat
Keyword(s):  
Physical Properties ◽  
Fine Particles ◽  
Second Step ◽  
Bovine Bone ◽  
Sintering Process ◽  
X Ray Diffraction ◽  
Property Development ◽  
Hydroxyapatite Ceramics ◽  
Milling Method ◽  
Sintering Method

In this research, the two-step sintering method was employed to develop the physical properties of Hydroxyapatite (HA) ceramics. HA powder was extracted from bovine bone and vibro-milling method was used to make the fine particles. For the two-step sintering process, the samples were heated up to the first step temperature (T1=1200°C) for 6 min then the temperature was lowered down to second step temperatures (T2=1150°C and 1100°C) for 5, 10 and 15 h. Another set of samples were heated up to the first step temperature (T1=1250°C) for 6 min then the temperature was lowered down to second step temperature (T2=1150°C) for 5, 10 and 15 h. X-ray diffraction (XRD) was carried out for investigating the phase formation in the prepared ceramics. Physical properties of the prepared ceramics were studied such as porosity, density by Archimedess principle. It is found that most of the samples exhibit Ca5(PO4)3(OH) phase with JCPDS number 09-0432. The first step temperature plays the most roles on controlling the density of HA ceramics than T2and dwell times. Microstructures of the HA powder and ceramics were characterized using scanning electron microscope (SEM).The feasibility in using the prepared ceramics for bone replacement applications was discussed.

Fabrication of Porous Hydroxyapatite Ceramics by Microwave Sintering Method

2005 ◽  
Vol 288-289 ◽  
pp. 529-532 ◽  
Author(s):  
Xin Long Wang ◽  
Z. Wang ◽  
Hong Song Fan ◽  
Yu Mei Xiao ◽  
Xing Dong Zhang
Keyword(s):  
Rapid Heating ◽  
Microwave Sintering ◽  
Microwave Processing ◽  
Sintering Process ◽  
Dual Frequency ◽  
Porous Hydroxyapatite ◽  
Uniform Microstructure ◽  
Hydroxyapatite Ceramics ◽  
Heating Behavior ◽  
Sintering Method

Microwave processing of porous hydroxyapatite ceramics was investigated in a dual frequency microwave-sintering furnace. The results revealed that microwave-sintering process could get sintered ceramics at much shorter sintering time and at lower sintering temperature than that of the conventionally heat-sintering process. Further, the microwave-sintered samples showed much smaller grain size and more uniform microstructure and reached a comparable compressive strength. The mechanism of rapid heating behavior of hydroxyapatite ceramics in microwave was also discussed. The results revealed that microwave processing was a promising method for sintering porous hydroxyapatite ceramics.

Effect of Heat Treating Temperature on Chemical and Physical Properties of Natural Hydroxyapatite Produced From Bovine Bone

2009 ◽  
Author(s):  
Mousa Younesi ◽  
Mehdi Javidi ◽  
Mohammad Ebrahim Bahrololoom ◽  
Hamidreza Fooladfar
Keyword(s):  
Physical Properties ◽  
Diffraction Analysis ◽  
Heat Treating ◽  
White Powder ◽  
Bovine Bone ◽  
X Ray Diffraction ◽  
X Ray ◽  
Heat Treated ◽  
Different Temperatures ◽  
Natural Hydroxyapatite

This study focused on chemical and physical properties of Hydroxyapatite powder was prepared by burning bone and heat treating the obtained bone ash at different temperatures (600, 700, 800, and 1100 °C) in an air furnace. The black ash was converted to a white powder after heat treatment. Results of X-ray diffraction analysis and Fourier transform infra-red spectroscopy that were done on heat treated powders in different temperatures indicated that the white powder was hydroxyapatite and did not contain any organic components of the bone. Furthermore, results of X-ray diffraction analysis were shown that phase transformation of the resulted hydroxyapatite to other calcium phosphate phases did not occur up to 1100 °C. X-ray fluorescence analyses revealed that calcium and phosphorous were the main elements and magnesium and sodium were present as minor impurities. The results of the energy dispersive X-ray analysis showed that Ca/P ratio of this natural hydroxyapatite varies between 1.46 and 2.01. The resulted material was found to be thermally stable up to 1100 °C. The density of natural hydroxyapatite heat treated at 800 °C was measured to be 3.187 g/cm3.

Li2ZnTi3O8 Microwave Dielectric Ceramics Prepared by the Reaction-Sintering Process

2015 ◽  
Vol 655 ◽  
pp. 164-167 ◽  
Author(s):  
Xu Sheng Hu ◽  
Guo Guang Yao ◽  
Xiu Lao Tian
Keyword(s):  
Dielectric Properties ◽  
Microwave Dielectric Properties ◽  
Reaction Sintering ◽  
Sintering Process ◽  
X Ray Diffraction ◽  
X Ray ◽  
Microwave Dielectric ◽  
Pure Phase ◽  
Dielectric Ceramics ◽  
Sintering Method

Li2ZnTi3O8ceramics were prepared by reaction-sintering process (calcination free). The crystal phase and microstructure were investigated using X-ray diffraction (XRD) and scanning electron microscopy (SEM). A pure phase of Li2ZnTi3O8ceramics sintered at 1075 °C-1150 °C with cubic spinel structure was confirmed by XRD. The microwave dielectric properties (εr,Qxf) of Li2ZnTi3O8ceramics were strongly dependent on the densification and grain size. The τfof Li2ZnTi3O8ceramics was almost independent with the sintering temperatures. In particular, Li2ZnTi3O8ceramics by reaction-sintering method sintered at 1125 °C for 5 h exhibited good combination microwave dielectric properties of εr=21.7, Q×f=70 500 GHz (at 7.5 GHz) and τf=-13 ppm/°C.

Properties of Si3N4 Based Nanocomposites Prepared by Pressureless Sintering Method

2012 ◽  
Vol 532-533 ◽  
pp. 53-56
Author(s):  
Ming Li Li ◽  
Qiong Yu ◽  
Ying Xu ◽  
Qing Guo Lu ◽  
Chun Jiang Zhou
Keyword(s):  
Dielectric Properties ◽  
Xrd Analysis ◽  
Pressureless Sintering ◽  
Low Density ◽  
Sintering Process ◽  
X Ray Diffraction ◽  
X Ray ◽  
Main Crystalline Phase ◽  
Amorphous Si ◽  
Sintering Method

Si3N4 based nanocomposites were prepared with nano-sized amorphous SiO2 and Si3N4 powders by pressureless sintering method. The microstructures, phase composition, mechanical and dielectric properties of the nanocomposites were investigated. The scanning electrical microscope (SEM) photographs reveal that the grains are big and elongated. The X-ray diffraction (XRD) analysis shows that the main crystalline phase in the composites is Si2N2O formed during the sintering process. More β-Si3N4 phases were retained in the nanocomposites with the increase amount of the amorphous Si3N4 powders and no phase of SiO2 were observed. The densities and the strength of the nanocomposites decreased with the increase of amorphous SiO2 content. Despite low density, the flexural strengths of the composites reaches 220MPa and the ceramic has excellent dielectric properties with dielectric constant as low as 3.2-4.7 and dielectric loss in the range 2.6-3.9×10-3.

scholarly journals Synthesis of Cu-CNTs nanocomposites via double pressing double sintering method

2018 ◽  
Vol 23 (4) ◽  
pp. 319-334 ◽  
Author(s):  
Marjan Darabi ◽  
Masoud Rajabi
Keyword(s):  
Electrical Conductivity ◽  
Ball Mill ◽  
Bending Strength ◽  
Sintering Process ◽  
Micro Hardness ◽  
X Ray Diffraction ◽  
X Ray ◽  
Conventional Sintering ◽  
Cold Pressed ◽  
Sintering Method

In this research, copper (Cu)-carbon nanotubes (CNTs) nanocomposites were synthesized with different weight percentages of CNTs by double pressing double sintering (DPDS) method as well as conventional sintering method. A planetary ball mill was used to disperse CNTs in Cu matrix. The milled powders were first cold pressed to 450 MPa in a uniaxial stainless-steel die with cylindrical compacts (diameter: 12 mm and height: 5 mm). The effect of CNTs content and the DPDS method on the properties of the nanocomposites were investigated. The microstructure and phase analysis of Cu-CNTs nanocomposite samples were studied by FESEM and X-Ray Diffraction. The electrical conductivity of nanocomposites was measured and compared to both sintering methods. Mechanical properties of Cu-CNTs nanocomposites were characterized using bending strength and micro-hardness measurements. Enhancements of about 32% in bending strength, 31.6% in hardness and 19.5% in electrical conductivity of Cu-1 wt.% CNTs nanocomposite synthesized by DPDS method were observed as compared to Cu-1 wt.% CNTs nanocomposites fabricated under the similar condition by a conventional sintering process.

scholarly journals Sintesis dan Karakterisasi Biokeramik Tulang sebagai Bahan Implant dengan Metode Sintering

2017 ◽  
Vol 4 (2) ◽  
pp. 84
Author(s):  
Syamsuddin Syamsuddin
Keyword(s):  
Experimental Study ◽  
Fourier Transform ◽  
Fourier Transform Infrared ◽  
Bovine Bone ◽  
Cleaning Process ◽  
X Ray Diffraction ◽  
X Ray ◽  
Sintering Method

Abstract—An experimental study on the production of hydroxyapatite (HA = Ca10(PO4)6(OH)2) is conducted in this paper using sintering method. The experiment stars with cleaning process of bovine bone. The final products were characterized by X-Ray Diffraction (XRD), Fourier Transform Infrared (FTIR) and Atomic Absortion Spestroscopy (AAS). The obtained XRD spectra (HA synthesis) were compared to the JCPDS 09-0432 data andis and resulting a good enough result. It is also obtained that HA synthesis rasio Ca/P dengan AAS is 1.69.

Microstructure and Physical Properties of Clay-Polymer Composites

2000 ◽  
Vol 628 ◽  
Author(s):  
T.N. Blanton ◽  
D. Majumdar ◽  
S.M. Melpolder
Keyword(s):  
Composite Materials ◽  
Physical Properties ◽  
Polymer Composites ◽  
Basal Plane ◽  
X Ray Diffraction ◽  
X Ray ◽  
Layered Clay

ABSTRACTClay-polymer nanoparticulate composite materials are evaluated by the X-ray diffraction technique. The basal plane spacing provided information about the degree of intercalation and exfoliation of the 2: 1 layered clay structure. Both intercalation and exfoliation are controlled by the identity of the polymer and the clay:polymer ratio.

scholarly journals Thermal, Structural, and Physical Properties of Freeze Dried Tropical Fruit Powder

2014 ◽  
Vol 2014 ◽  
pp. 1-10 ◽  
Author(s):  
K. A. Athmaselvi ◽  
C. Kumar ◽  
M. Balasubramanian ◽  
Ishita Roy
Keyword(s):  
Particle Size ◽  
Physical Properties ◽  
Average Particle Size ◽  
Average Particle ◽  
X Ray Diffraction ◽  
Tropical Fruit ◽  
X Ray ◽  
Freeze Dried ◽  
Fruit Powder ◽  
Lcr Meter

This study evaluates the physical properties of freeze dried tropical (guava, sapota, and papaya) fruit powders. Thermal stability and weight loss were evaluated using TGA-DSC and IR, which showed pectin as the main solid constituent. LCR meter measured electrical conductivity, dielectric constant, and dielectric loss factor. Functional groups assessed by FTIR showed presence of chlorides, and O–H and N–H bonds in guava, chloride and C–H bond in papaya, and chlorides, and C=O and C–H bonds in sapota. Particle size and type of starch were evaluated by X-ray diffraction and microstructure through scanning electronic microscopy. A semicrystalline profile and average particle size of the fruit powders were evidenced by X-ray diffraction and lamellar/spherical morphologies by SEM. Presence of A-type starch was observed in all three fruits. Dependence of electric and dielectric properties on frequency and temperature was observed.

scholarly journals Fabrication and Physical Properties of Single-Crystalline Βeta-FeSi2 Nanowires

2020 ◽  
Vol 15 (1) ◽  
Author(s):  
Chih-Yung Yang ◽  
Shu-Meng Yang ◽  
Yu-Yang Chen ◽  
Kuo-Chang Lu
Keyword(s):  
Electron Microscopy ◽  
Physical Properties ◽  
Chemical Vapor ◽  
Chemical Vapor Deposition Method ◽  
Ferromagnetic Behavior ◽  
X Ray Diffraction ◽  
Field Emitters ◽  
Transmission Electron ◽  
Single Source Precursor ◽  
Carrier Gases

Abstract In this study, self-catalyzed β-FeSi2 nanowires, having been wanted but seldom achieved in a furnace, were synthesized via chemical vapor deposition method where the fabrication of β-FeSi2 nanowires occurred on Si (100) substrates through the decomposition of the single-source precursor of anhydrous FeCl3 powders at 750–950 °C. We carefully varied temperatures, duration time, and the flow rates of carrier gases to control and investigate the growth of the nanowires. The morphology of the β-FeSi2 nanowires was observed with scanning electron microscopy (SEM), while the structure of them was analyzed with X-ray diffraction (XRD) and transmission electron microscopy (TEM). The growth mechanism has been proposed and the physical properties of the iron disilicide nanowires were measured as well. In terms of the magnetization of β-FeSi2, nanowires were found to be different from bulk and thin film; additionally, longer β-FeSi2 nanowires possessed better magnetic properties, showing the room-temperature ferromagnetic behavior. Field emission measurements demonstrate that β-FeSi2 nanowires can be applied in field emitters.

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