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Diffusion Kinetics of Carbonate Hydroxyapatite (CHAP) for Adsorbing F^- Dissolved in Water

Acta Geologica Sinica(English Edition) 2006年第2期80卷 243-248页

作者： HUANG Zhiliang ZHANG Lianmeng LIU Yu WANG Qilin HE Qianjun CHEN Wei State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan Hubei 430070 Research Institute of Mineral Material Wuhan Institute of Technology Wuhan Hubei 430073

A systematic research was performed about diffusion kinetics of adsorbing F^- dissolved in water for carbonate hydroxyapatite （CHAP） from the natural hydroxyapatite which was modified by adulterating with CO3^2-. The result shows that the speed of F^- adsorption is controlled by membrane diffusion when F^- concentration is relatively low, which is expressed by the kinetic equation of diffusion Q=0.0005（Ci-C）（t-ti）＋0.3967, or by vacancy diffusion when F^- concentration is relatively high, which is expressed by the kinetic equation of diffusion In[C（o, t）]=8.4718-0.5048Int. Based on the feature of CHAP for adsorbing F^- dissolved in water and its special channel of the structure of CO3^3- modified hydroxyapatite, models of vacancy diffusion and membrane diffusion were established.

关键词： carbonate hydroxyapatite （CHAP） F^- ion diffusion kinetics

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The Nano Pulverization of Traditional Chinese Medicine Liuwei Dihuang

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Journal of Wuhan University of technology(materials Science) 2006年第2期21卷 105-108页

作者：马培艳 State Key Lab of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 ChinaSchool of Science Wuhan University of Technology Wuhan 430070 China

The crude drug of Liuwei Dihuang was pulverized to nano particles to improve its bioavailab.lity. The appropriate technique parameters were studied. Paeonol, typical marker of Liuwei Dihuang , was extracted with organic solveat in ultrasonic and its content was determined by HPLC. The appropriate techrdques parameters are as follows ： rotating speed control 1200 r/ min , grinding time control 50min and mass percent concentration control 3.8% . The experimental results show that the average particle diameter is 161.9 nm and the great majority of the plant cell wall is broken into pieces after nano pulverization. The extraction efficiency of paeonol is increased by 23.5% .

关键词： HSCS pulverizer Liuwei Dihuang nano particles paeonol

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Study on the isothermal oxidation behavior in air of Ti_(3)AlC_(2) sintered by hot pressing

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Science China(Technological Sciences) 2006年第5期49卷 513-520页

作者： XU Xuewen1, 2, LI Yangxian1, MEI Bingchu2, ZHU Jiaoqun2, LIU Heyan1 & QU Jingping1 1. School of material Science and Engineering, Hebei University of technology, Tianjin 300130, China 2. state key lab.ratory of advanced technology for materials synthesis and processing, Wuhan Univer- sity of technology, Wuhan 430070, China 1. School of Material Science and Engineering Hebei University of Technology Tianjin 300130 China 2. State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China

The isothermal oxidation behavior at 900–1300°C for 20 h in air of bulk Ti3AlC2 with 2.8 wt% TiC sintered by means of hot pressing was investigated in the work. The isothermal oxidation behavior generally followed a parabolic rate law. The parabolic rate constants increased from 1.39×10[10] kg[2]·m[4]·s[1] at 900°C to 5.56×10[9] kg[2]·m[4]·s[1] at 1300°C. The calculated activation energy was 136.45 kJ/mol. It was demonstrated that Ti3AlC2 had excellent oxidation resistance due to the continuous, dense; adhesive protect scales consisted of a mass of α-Al2O3; a little of TiO2;/or Al2TiO5. In principle, the oxide scale was grown by the inward diffusion of O[2]; the outward diffusion of Ti[4+]; Al[3+]. The rapid outward diffusion of cations usually resulted in the formation of cracks, gaps,; holes.

关键词： Ti3AlC2, oxidation behavior, kinetics.

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Regulating energy storage performances of 0.85NaNbO_(3)-0.15Bi(Zn_(2/3)Nb_(1/3))O_(3) ceramics using BaTiO_(3)

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Journal of Materiomics 2022年第1期8卷 166-173页

作者： Dongyu Lai Zhonghua Yao Wei You Biao Gao Qinghu Guo Ping Lu Amjad Ullah Hua Hao Minghe Cao Hanxing Liu State Key Laboratory of Advanced Technology for Materials Synthesis and Processing School of Material Science and EngineeringWuhan University of TechnologyWuhan430070China International School of Material Science and Engineering Wuhan University of TechnologyWuhan430070China

Recently,NaNbO_(3)-based ceramics with excellent energy storage performances(ESPs)and fast chargedischarge characteristics have attracted great *** this case,BaTiO_(3) modified 0.85NaNbO_(3)-0.15Bi(Zn_(2/3)Nb_(1/3))O_(3)(0.85NN-0.15BZN-yBT)ceramics were designed and successfully fabricated using solid state *** discharge storage density of the ceramics increases from 1.22 J/cm^(3) at y=0-1.84 J/cm^(3) at y=8%,which is 1.5 times higher than pure 0.85NN-0.15BZN *** ceramic reveals excellent temperature stability up to 150℃,good discharge cycling after 10^(5) cycles and high discharge speed of 2.0μs,broadening the scope of NaNbO_(3)-based ceramics for energy storage applications.

关键词： Perovskites Ceramics Dielectric properties Energy storage Capacitors

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Spark plasma sintering of α-Si3N4 ceramics with MgO-AL2O3 as sintering additives

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key Engineering materials 2007年 351卷 176-179页

作者： Yan, Faqiang Chen, Fei Shen, Qiang Zhang, Lianmeng State Key Lab. of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China Shandong Research and Design Institute of Industrial Ceramics Zibo 255031 China

In the present study, α-Si3N4 is prepared by using MgO and Al2O3 as the sintering additives and spark plasma sintering (SPS) technique. The SPS sintering mechanism is discussed. The relationship between the content of sintering additives, sintering temperature and relative densities of the samples is analyzed. The results suggest that when the sintering temperature is 1300-1500°C, the content of sintering additives is 6wt.%-10wt.%, the relative density of sintered samples is 64%-96%. When the sintering temperature reaches 1400°C, the content of sintering additives is 10%, the samples can be fully dense sintered and the relative density can be up to 95%. The sintering mechanism is liquid phase sintering. The bending strength of the sintered samples is 50-403MPa and has a close correlation with the relative density.

关键词： Ceramic materials

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In-Flight Formation of Nano-Crystalline Titanium Dioxide Powder in a Plasma Jet and Its Characterization

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Plasma Science and technology 2010年第4期12卷 426-432页

作者： P. V. ANANTHAPADMANABHAN M. VIJAY T. K. THIYAGARAJAN K. P. SREEKUMAR V. SELVARAJAN Jiaguo YU Shengwei LIU Laser & Plasma Technology Division Bhabha Atomic Research Centre Mumbai-400085 India Department of Physics Bharathiar University Coimbatore 641046 India State Key Laboratory of Advanced Technology for Material Synthesis and Processing Wuhan University of Technology Wuhan 430070 China

Nanocrystalline titanium dioxide powder was synthesized by in-flight oxidation of titanium dihydride （TiH2） powder in a thermal plasma jet. TiH2 powder was injected into the thermal plasma jet and allowed to react with oxygen injected downstream the jet. Characteriza- tion of the powder by various analytical tools indicated that the powder consisted of nano-sized titanium dioxide particles consisting predominantly of the anatase phase. It is suggested that the thermo-chemistry of the oxidation process contributes significantly to the formation of nano-sized titania. The large energy released during the oxidation process dissociates the TiO2 particles into TiO（g） and titanium vapour, which recombine downstream with oxygen and form nano particles of TiO2.

关键词： nanostructures titanium dioxide arc plasma synthesis reactive plasma pro- cessing surface properties

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Effect of stacking layers on the structure and properties of Ca(Mg 1/3Nb2/3)O3/ CaTiO3 thin films

Effect of stacking layers on the structure and properties of...

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6th Asian Meeting on Electroceramics, AMEC-6, in conjunction with the Electronics Division Meeting of the Ceramic Society of Japan

作者： Zhou, Jing Zhu, Jie Chen, Wen Shen, Jie Lei, Qiong He, Huimin State Key Lab. of Advanced Technology for Materials Synthesis and Processing Institute of Materials Science and Engineering Wuhan University of Technology China

ISBN: (纸本)0878493069

Effect of stacking layers on the structure and properties of Ca(Mg 1/3Nb2/3)O3/CaTiO3 (CMN/CT) microwave dielectric heterogeneous thin films prepared was investigated. Precursor solutions for CMN and CT synthesis were obtained by Pechini method. The arrangement pattern has affected structure and properties of heterogeneous thin film. The CMN-CT arrangement heterostructure thin film has second phase from the CMN films layer. The CT-CMN heterostructure film which has a smooth and dense microstructure was composed of pure perovskite phase without any second phase, this result was attributed to the CT film layer which is a buffer layer between substrate and CMN film layer. At 1MHz frequency, CT-CMN exhibits the dielectric properties of Εr=47.5, tanδ=0.020. © (2010) Trans Tech Publications.

关键词： Thin films

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Preparation of High Performance Green Alumina Ceramic Balls by Roller Production Waste

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武汉理工大学学报（材料科学版）（英文版） 2008年第1期23卷 134-138页

作者： ZHONG Lianyun WU Bolin ZHANG Lianmeng ZHANG Guifang State Key Lab of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China Key Lab of Nonferrous Materials and New Processing Technology( Guangxi University Guilin University of Technology) of Ministry of EducationGuilin 541004China School of Chemistry and Ecological Engineering Guangxi University for NationalitiesNanning 530006China Key Lab of Nonferrous Materials and New Processing Technology Guangxi University Guilin University of Technology of Ministry of EducationGuilin 541004China State Key Lab of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China

To reuse roller waste as a raw material of high performance green ceramic balls,three kinds of white alumina ceramic balls whose wear resistance were 2-3 times of the best high alumina ceramic ball with90% Al2O3 were prepared,and the Al2O3 content of the prepared balls was 75%.It is found that the effect of calcia and magnesia on the wear resistance of ceramic balls is contrast to the accepted one: the wear rate of the ceramic balls prepared in CaO-Al2O3-SiO2 system is the lowest and the wear rate of the ceramic balls prepared in MgO-Al2O3-SiO2 is the *** main crystal phase of the ceramic ball is mullite and *** ceramic ball granular is uniform and fine with 4-5 um average *** pore diameter is about 2 *** wear way of the ceramic balls is mainly transcrystalline fracture.

关键词： roller production waste alumina ceramic ball wear resistance white transcrystalline fracture

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Ceramizable C_f/BPR composites with enhanced oxidation resistance up to 1670 °C

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Ceramics International 2025年

作者： Li, Junguo Zhao, Chenhan Jiang, Feng Zhang, Shiquan Yang, Suohui Xiang, Qianqian Li, Meijuan zhang, Jian Shen, Qiang School of Material Science and Engineering Wuhan University of Technology Wuhan 430070 China School of Chemistry Chemical Engineering and Life Science Wuhan University of Technology Wuhan 430070 China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China

Ceramizable carbon fiber/boron-modified phenolic resin (Cf/BPR) composites are cost-effective and suitable for fabricating large-scale components, making them vital for thermal protection systems in aerospace vehicles... 详细信息

Ceramizable carbon fiber/boron-modified phenolic resin (C_f/BPR) composites are cost-effective and suitable for fabricating large-scale components, making them vital for thermal protection systems in aerospace vehicles. However, their thermal resistance requires further improvement. This study investigates the modification of C_f/BPR composites using ZrSi₂, Al, and mica to enhance their thermal resistance. High-temperature static oxidation and oxyacetylene ablation tests are conducted to evaluate their high-temperature performance. The role of each filler on oxidation resistance is discussed. The results reveal that when ZrSi₂ is added at 33.75 phr, Al at 3.75 phr, and mica at 5 phr, the prepared composite exhibits a flexural strength of 56 MPa after 20 min of static oxidation at 1600 °C, with excellent protection of the carbon fibers. After oxidation at 1670 °C, the flexural strength remains at 45 MPa, despite some degree of carbon fiber ablation. © 2025 Elsevier Ltd and Techna Group S.r.l.

关键词： Al Ceramizable composite Mica Oxidation resistance Phenolic resin ZrSi2

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Effect of Ni content in Cu_(1-x)Ni_(x) coating on microstructure evolution and mechanical properties of W/Mo joint via low-temperature diffusion bonding

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Journal of materials Science & technology 2020年第19期54卷 171-180页

作者： Mei Rao Guoqiang Luo Jian Zhang Yiyu Wang Qiang Shen Lianmeng Zhang State Key Lab of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan430070China Materials Science and Technology Division Oak Ridge National LaboratoryOak RidgeTN37831-6064USA

The 93 W and Mo1 refractory metals were bonded with different Cu_(1-x)Ni_(x) coating interlayers of various Ni content using plasma-activated sintering at 700℃.The effects of the Ni content in the Cu_(1-x)Ni_(x) coating interlayer on the interfacial microstructure evolution and mechanical properties of the W/Mo joints were *** maximum average shear strength of the W/Mo joint was 316.5 MPa when the Ni content of the Cu_(1-x)Ni_(x) coating interlayer was 25%.When the Ni content of the Cu_(1-x)Ni_(x) coating interlayer was below 50%,the atomic diffusion at the W/Mo joint interface was adequate without the formation of intermetallic compounds,as demonstrated by the High Resolution Transmission Electron Microscope analyses of the *** presence of Ni in Cu_(1-x)Ni_(x) promoted diffusion bonding at the interface,which contributed to the high mechanical properties of the W/Mo *** an increase in the Ni content of the Cu_(1-x)Ni_(x) coating interlayer,the Mo Ni intermetallic compound(IMC)nucleated and grew at the Cu1-xNix coating/Mo1 *** the Ni content of the Cu_(1-x)Ni_(x) coating interlayer was above 50%,the generation of a brittle Mo Ni IMC weakened the shear strength of the W/Mo joint dramatically.

关键词： Refractory metal Cu_(1-x)Ni_(x)coating interlayer Solid solution MoNi IMC Microstructure Shear strength

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