Gelcasting of Mechanochemically Synthesized Hydroxyapatite

Jia, Yu; Hotta, Yuji; Sato, Kimiyasu; Watari, Koji; Kanno, Yoshinori

doi:10.4028/www.scientific.net/KEM.280-283.1555

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Preparation of Porous Hydroxyapatite Scaffolds
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Study on Physicochemical Properties of the Carbonated Hydroxyapatite Bone Cement
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Mechanical Properties of Macroporous Biphasic Calcium Phosphate Bioceramics Fabricated Using a Porogen
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Gelcasting of Mechanochemically Synthesized Hydroxyapatite
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Synthesis of Calcium Phosphate/Gypsum Composite Powders
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Processing of Calcium Phosphate Porous Materials by 'Self-Setting'
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Setting Behavior of Fast-Setting Calcium Phosphate Cement with Mineral Phase of Bone
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Synthesis of Apatite Ceramics with Bimodal Pore Structure Using Mechanochemically Prepared Fine Apatite Powder
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首页Key Engineering MaterialsHigh-Performance Ceramics IIIGelcasting of Mechanochemically Synthesized...

Gelcasting of Mechanochemically Synthesized Hydroxyapatite

摘要:

Hydroxyapatite powders were prepared via mechanochemical synthesis method. The starting reagents for HAP powders were vibration ball milled for 2 h and then calcined at 800°C for 1 h. X-ray diffraction patterns and IR spectrum shown that pure crystalline apatite powder (HAP) was obtained. The as-synthesized powders were gelcasted and then sintered at 1200°C for 2 h. It was observed from SEM micrographs that the prepared green body has uniform microstructure. The bending strength of the dried green body was as high as 18 MPa that is enough to be machined into required form before sintering. The sintered ceramics has a density of 2.5 g/cm3 and a flexural strength of 72 MPa with a homogenous microstructure.

信息:

期刊:

Key Engineering Materials (280-283卷)

主题:

High-Performance Ceramics III

编辑:

Wei Pan, Jianghong Gong, Chang-Chun Ge and Jing-Feng Li

页数:

1555-1558

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.280-283.1555

引用:

Y. Jia et al., "Gelcasting of Mechanochemically Synthesized Hydroxyapatite", Key Engineering Materials, Vols. 280-283, pp. 1555-1558, 2005

上线时间:

February 2007

作者:

Yu Jia, Yuji Hotta, Kimiyasu Sato, Koji Watari, Yoshinori Kanno

关键字:

Gelcasting, Hydroxyapatite (HAP), Solid-State Synthesis

输出:

RIS, BibTeX

价格:

$38.00

允许:

请求权限

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文章题目页数

Hydrogen Reduction and Sintering Behavior of Al₂O₃/CuO Powder Mixtures Prepared from Different Raw Powders

作者: Sung Tag Oh, Se Joong Yoon

摘要: The reduction behavior of Al2O3/CuO powder mixtures, prepared from Al2O3/CuO or Al2O3/Cu-nitrate, was investigated by using thermogravimetry and hygrometry. Also, the influence of powder characteristics on the microstructure and properties of hot-pressed composites is analyzed. It was found that the hydrogen reduction process of nano-sized oxide particles and properties of sintered composites strongly depends on their distribution and size in composite powder. The formation mechanisms of nano-sized Cu dispersions are discussed based on the powder characteristics and reduction kinetics. In addition, the dependence of the microstructure and mechanical properties of hot-pressed composites on powder characteristics is discussed in terms of the initial size and distribution of Cu particles.

181

Synthesis of Nanocrystalline 0.94Bi_0.5Na_0.5TiO₃-0.06BaTiO₃ Powder by a Citrate Method

作者: Zhi Bin Tian, Xiao Hui Wang, Ji Li, Wei Zhao, Long Tu Li

摘要: A citrate method to synthesize 0.94Bi0.5Na0.5TiO3-0.06BaTiO3 nano-powder was studied. The stable gel was obtained by the control of the pH value and temperature of the precursor solution. The BNBT nano-powder was produced after calcining the xerogel at 600°C~800°C. The average grain size of the powder calcined at 700°C for 3 h is 50 nm, and the grain size of the ceramic sintered at 1080°C is 0.7 μm. The sintering temperature used is 100°C lower than the BNBT ceramic prepared by traditional method, but the electrical properties were comparable. In addition, it was found that the ball-milling process has important effect on the morphology of the ceramics and the orientation crystals were eliminated due to the disintegration of agglomerates during milling.

103

Hydrothermal Treatment of Coprecipitated YSZ Powders

作者: Alexander Rodrigo Arakaki, Walter Kenji Yoshito, Valter Ussui, Dolores Ribeiro Ricci Lazar

摘要: Zirconia stabilized with 8.5 mol% yttria (YSZ) were synthesized by coprecipitation and resulting gels were hydrothermallly treated at 200°C and 220 PSI for 4, 8 and 16 hours. Products were oven dried at 70°C for 24 hours, isostatically pressed as pellets and sintered at 1500 °C for 1 hour. Powders were characterized for surface area with N2 gas adsorption, X-ray diffraction, laser diffraction granulometric analysis and scanning and transmission electronic microscopy. Density of ceramics was measured by an immersion method based on the Archimedes principle. Results showed that powders dried at 70°C are amorphous and after treatment has tetragonal/cubic symmetry. Surface area of powders presented a significant reduction after hydrothermal treatment. Ceramics prepared from hydrothermally treated powders have higher green density but sintered pellets are less dense when compared to that made with powders calcined at 800°C for 1 hour due to the agglomerate state of powders. Solvothermal treatment is a promising procedure to enhance density.

983

Sintering Behavior and Microwave Dielectric Properties of 95MCT Ceramics Prepared from Different Size Powders by Sol-Gel Method

作者: Yi Hang Fang, Kai Miao, Si Qiao Feng, Jia Meng Cao, Huan Ping Wang, Shi Qing Xu

摘要: The 0.95MgTiO₃-0.05CaTiO₃ (95MCT) powders and ceramics were prepared by a sol-gel method by using Mg(NO₃)₂•6H₂O, Ca(NO₃)₂•4H₂O and Ti(C₄H₉O)₄ as the starting materials. The effects of calcination temperature on phase formation, morphology and particle size distribution of the proposed powders were examined, and the microwave dielectric properties of 95MCT ceramics made from different size particles were investigated. The dried gels were calcined at 600 °C, 700 °C, 800 °C and 900 °C, and the derived particle sizes of powders were 10-20 nm, 50-100 nm, 60-120 nm and 120-150 nm, respectively. The proper sizes, which range from 50-150 nm, lowered the sintering temperature of 95MCT ceramics effectively from 1400 °C to 1175 °C due to the high surface energy. Sintered at 1175 °C, the 95MCT ceramic prepared from 50-100 nm size particles had compact structure and exhibited good microwave dielectric properties: εr = 21.33 and Q×f = 36,315 GHz.

923

Phase Formation of Hydroxyapatite Particles at Different Calcination Temperatures

作者: S. Tigunta, W. Leenakul, Sukum Eitssayeam, Gobwute Rujijanagul, Tawee Tunkasiri, Kamonpan Pengpat

摘要: Hydroxyapatite (HA) is classified as one of the important bioceramics, which has been used in orthopedics, medical and dental applications. It has bioactivity and good biocompatibility with the human organism, which is suitable in medical applications as an implant or coating on prostheses such as metal. In this study, the effects of calcinations temperatures on phase formation and physical properties of HA particles were investigated. The HA particles synthesized from bovine bone were cleaned and fired at 800°C and subsequently ball milled for 24 h. Then received HA particles were divided into two parts. The first one was calcined at various temperatures from 900 to 1400°C and the second one was vibratory milled for 4 h and subsequently calcined at various temperatures from 900 to 1400°C. The calcined HA particles were characterized by X-ray diffraction (XRD) for their crystal structure and particle size analysis. Scanning electron microscope (SEM) was used for microstructural.

170