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Ceramics international 85건

  1. [해외논문]   Thermal conductivity modelling based on physical and chemical properties of refractories   SCI SCIE SCOPUS

    Akiyoshi, M.M. (Federal University of São Carlos, Materials Engineering Department, Brazil ) , Christoforo, A.L. (Federal University of São Carlos, Civil Engineering Department, Rod. Washington Luiz, km 235, São Carlos, SP 13565-905, Brazil ) , Luz, A.P. (Federal University of São Carlos, Materials Engineering Department, Brazil ) , Pandolfelli, V.C. (Federal University of São Carlos, Materials Engineering Department, Brazil)
    Ceramics international v.43 no.6 ,pp. 4731 - 4745 , 2017 , 0272-8842 ,

    초록

    Abstract Thermal conductivity ( k ) is one of the most important properties in the design and optimization of refractory linings, as well as for defining safe heating and cooling schedules. Mathematical models for predicting refractories’ thermal conductivity have been proposed in the literature but, in general, they were simplified equations focusing on correlating k with density, alumina content or temperature. This work addresses the development of general expressions for k predictions as a function of physical (density, porosity) and chemical (oxide content) parameters with the temperature for Al 2 O 3 -SiO 2 and Al 2 O 3 -CaO-based refractories. The parallel hot wire technique was used to measure the thermal conductivity of insulating, dense and low-cement-containing (LCC) commercial products in the temperature range of 25°C to 1000°C. According to the results, the most suitable mathematical model correlating k with the samples’ density (apparent, volumetric or geometric) and temperature was the geometric one (r 2 = 97.1%). When considering multi-linear models and the combination of more parameters (oxide content, density, temperature), lower r 2 values were obtained (74.1–75.5%), indicating that this more complex and all-inclusive expression should lead to a less accurate prediction of thermal conductivity values. The advances presented will be a helpful tool for refractory producers and end-users.

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  2. [해외논문]   Magnetic properties and hyperfine interactions of Co1-2xNixMnxFe2O4 nanoparticles   SCI SCIE SCOPUS

    Baykal, A. (EYRA Textile Chemicals and Chemical Industry Trade Company, Saraçlar Industrial Zone, No:3-12, 34490, İkitelli-İstanbul/TURKEY ) , Eryiğ (Department of Chemistry, Middle East Technical University, 06500 Çankaya, Ankara, Turkey ) , it, Ş (Department of Electrical Electronic Engineering, Iğdır University, 76000 Iğdır, Turkey ) , . (Department of Physics, Hitit University, 19030 Çevre Yolu Bulvarı, Çorum, Turkey ) , Topkaya, R. (Department of Chemistry, İstanbul University, Avcılar, İstanbul, Turkey ) , Gü (Department of Textile Engineering, Namık Kemal University, 59860 Çorlu, Tekirdag, Turkey ) , ngü (Department of Chemistry, İstanbul University, Avcılar, İstanbul, Turkey ) , neş (Spin Device Technology Center, Faculty of Engineering, Shinshu University, 380-8553 Nagano, Japan) , , H. , Amir, Md. , Yıldız, A. , Kurtan, U. , Shirsath, Sagar E.
    Ceramics international v.43 no.6 ,pp. 4746 - 4752 , 2017 , 0272-8842 ,

    초록

    Abstract Co1-2xNixMnxFe2O4 (0.0≤x≤0.5) nanoparticles (NPs) were prepared via citrate assisted microwave combustion route. XRD analysis confirmed the cubic structure (spinel) of all samples. Average crystallite size of products (obtained from (311) diffraction line) was in the range of 32.9–43.4nm. The intense peak appearing at around 531cm −1 in FT-IR was attributed to the formation of a spinel ferrite. Magnetic properties of the products were investigated by room temperature vibrating sample magnetometer and MOssbauer spectroscopy. The magnetic parameters have been found to strongly depend on the Ni and Mn concentrations. The saturation magnetization continuously decreases with the increasing of the concentration (x). We found that Ni 0.5 Mn 0.5 Fe 2 O 4 NP has superparamagnetic character at room temperature. This result was also verified by MOssbauer analysis. Scanning electron microscopic analysis revealed the cubic morphology of all products, EDX and elemental mapping analyses confirmed the expected composition of each product.

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  3. [해외논문]   Facile synthesis of flexible and free-standing cotton covered by graphene/MoO2 for lithium-ions batteries   SCI SCIE SCOPUS

    Zhang, Xueqian (School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China ) , Huang, Xiaoxiao (School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China ) , Xia, Long (School of Materials Science and Engineering, Harbin Institute of Technology at Weihai, WeiHai 264209, China ) , Zhong, Bo (School of Materials Science and Engineering, Harbin Institute of Technology at Weihai, WeiHai 264209, China ) , Zhang, Xiaodong (School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China ) , Zhang, Tao (School of Materials Science and Engineering, Harbin Institute of Technology at Weihai, WeiHai 264209, China ) , Wen, Guangwu (School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China)
    Ceramics international v.43 no.6 ,pp. 4753 - 4760 , 2017 , 0272-8842 ,

    초록

    Abstract It is necessary to build flexible and free-standing materials for flexible/wearable electronics in high-performance lithium-ions batteries. Herein, we design and fabricate a flexible and free-standing 3 D carbon/MoO 2 composite through a facile immersing method followed by an annealing process. The carbon framework is supported by non-woven cotton totally covered by graphene sheets. The nanosized MoO 2 particles were uniformly anchored on cotton fibers and graphene sheets. The structure has several advantages, such as an interconnected 3D electronically conductive network, plenty of channels for electrolyte solution cross, and more active points for the electrode reaction. Compared with cotton/MoO 2 (C/MoO 2 ) without graphene sheets, the CGN/MoO 2 composite (cotton covered by graphene/MoO 2 ) showed much better thermal stability and excellent cycling performance. The proposed synthesis process paves a new way as promising electrode materials for high power battery applications such as roll-up displays and wearable devices.

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  4. [해외논문]   The effect of the surfactants on the formulation of UV-curable SLA alumina suspension   SCI SCIE SCOPUS

    Li, Kehang (Key Laboratory for Advanced Ceramics and Machining Technology of Ministry of Education, School of Material Science and Engineering, Tianjin University, NW, Tianjin 300072, China ) , Zhao, Zhe (Key Laboratory for Advanced Ceramics and Machining Technology of Ministry of Education, School of Material Science and Engineering, Tianjin University, NW, Tianjin 300072, China)
    Ceramics international v.43 no.6 ,pp. 4761 - 4767 , 2017 , 0272-8842 ,

    초록

    Abstract Stereolithography (SLA) has been regarded as the most promising rapid prototype (RP) production method for ceramic parts recently because of its better precision in size and site control. The rheological behavior and curing behavior of suspensions are controlling factors for ceramic stereolithography. In this work, oleic acid (OA), stearic acid (SA) and Poly(Acrylate Ammonium) (PAA-NH 4 ) were studied as the surfactant for HDDA-based suspension formulation. Modified alumina particles exhibit different wettability with HDDA monomer and thus the different rheology behavior and stability between the formulated suspensions. OA shows the best performance among all three dispersants. 40vol% alumina suspensions with a viscosity ˂3Pas at 30s −1 shear rate were successfully formulated with OA and SA. A sintering density of 95% can be reached for the OA- and SA-modified alumina UV-curable resins.

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  5. [해외논문]   Relaxor behavior of BaTiO3-BiYO3 perovskite materials for high energy density capacitors   SCI SCIE SCOPUS

    Wei, Meng (Corresponding author.) , Zhang, Jihua , Zhang, Miaomiao , Yao, Zongying , Chen, Hongwei , Yang, Chuanren
    Ceramics international v.43 no.6 ,pp. 4768 - 4774 , 2017 , 0272-8842 ,

    초록

    Abstract Dielectric materials with high dielectric constant and breakdown voltage are very promising for pulsed energy storage applications. In this paper, (1-x) BaTiO 3 -xBiYO 3 (x=0–0.5) ceramics were synthesized using conventional solid-state reaction method. The ceramic structure transformed from ferroelectric tetragonal phases (x≤0.5) to pseudo-cubic phases (x≥0.1). When x=0.2, beyond the solid solubility limit of BaTiO 3 -BiYO 3 , the second phase and glassy phases were formed, accompanying lattice parameter excursion. It revealed a gradual change from classic ferroelectric behavior in pure BaTiO 3 to highly diffusive and dispersive relaxor-like characteristics with BiYO 3 content increasing. It exhibited high polarization maximum and low remnant polarization, which was favorable for energy storage in (1-x)BaTiO 3 -xBiYO 3 ceramics, due to the disrupted long polarization, the created weak coupling and the formed second phase. Furthermore, the nonlinearity of the (1-x)BaTiO 3 -xBiYO 3 ceramics were weakened obviously. A maximum energy storage density of 0.316J/cm 3 at 66kV/cm with relative high energy efficiency of 82.7% was achieved in 0.8BaTiO 3 -0.2BiYO 3 ceramic, which indicated that (1-x)BaTiO 3 -xBiYO 3 ceramics were promising lead-free relaxor materials for energy storage applications.

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  6. [해외논문]   Controlled Zr doping for inkjet-printed ZTO TFTs   SCI SCIE SCOPUS

    Kim, Hunho (Corresponding author.) , Choi, Woon-Seop
    Ceramics international v.43 no.6 ,pp. 4775 - 4779 , 2017 , 0272-8842 ,

    초록

    Abstract This study examined the effects of controlled Zr doping on the electrical properties of inkjet-printed zinc-tin oxide (ZTO) thin-film transistors (TFTs). In contrast to previous reports, below a certain doping concentration, improved electrical properties were obtained due to the effectively suppressed oxygen vacancies, reduced trapped electrons, and controlled carrier concentrations. The 0.0025M Zr-doped inkjet-printed ZTO TFTs showed higher mobility, higher on-to-off current ratio, lower threshold voltage, and lower subthreshold slope of 6.43cm 2 /Vs, 3.72×10 8 , 3.35V, and 0.53V/dec, respectively, compared to the un-doped TFTs. The bias stability of the Zr-doped inkjet-printed ZTO TFT was also improved.

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  7. [해외논문]   Microstructural and electromagnetic study of low temperature fired nano crystalline MgCuZn ferrite with Bi2O3 addition   SCI SCIE SCOPUS

    Bahiraei, Hamed (Department of Physics, Faculty of science, Malayer University, Malayer, Iran ) , Ong, C.K. (Center for Superconducting and Magnetic Materials, Department of Physics, National University of Singapore, Singapore, Singapore)
    Ceramics international v.43 no.6 ,pp. 4780 - 4784 , 2017 , 0272-8842 ,

    초록

    Abstract The present study investigates electromagnetic properties, as well as microstructural and thermal stability, of low temperature fired MgCuZn ferrite with the addition of various amounts of Bi 2 O 3 . To achieve better performance at low sintering temperature, ceramic specimens were fabricated using nano-sized precursor powders through the nitrate-citrate auto-combustion method. X-ray diffraction study shows the formation of single phase spinel structure without any impurity phases. Compared with the additive-free sample, the addition of Bi 2 O 3 increases the density of all specimens. Scanning electron microscopy micrographs of samples indicate that Bi 2 O 3 content significantly affects densification through grain growth promotion. Excessive amounts of Bi 2 O 3 , however, lead to abnormal grain growth. Moreover, the sample with 0.25wt% Bi 2 O 3 shows the highest density and grain shape uniformity as well as the lowest porosity. Dynamic magnetic properties were studied in a frequency range of 1–90MHz, using an impedance analyzer. Results reveal that the sample with a low amount of additive (0.25wt%) has the highest saturation magnetization, initial permeability (at 1MHz), and quality factor, whereas it's Curie temperature slightly decreases. With the further increase of Bi 2 O 3 content, however, the initial permeability and saturation magnetization of samples deteriorate gradually.

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  8. [해외논문]   Influence of injection temperature and pressure on the properties of alumina parts fabricated by low pressure injection molding (LPIM)   SCI SCIE SCOPUS

    Sardarian, M. (Corresponding author.) , Mirzaee, O. , Habibolahzadeh, A.
    Ceramics international v.43 no.6 ,pp. 4785 - 4793 , 2017 , 0272-8842 ,

    초록

    Abstract The quality of ceramics parts made by powder injection molding (PIM) method is influenced by a range of factors such as powder and binder characteristics, rheological behavior of feedstock, molding parameters and debinding and sintering conditions. In this study, to optimize the molding parameters, the effect of injection temperature and pressure on the properties of alumina ceramics in the LPIM process were thoroughly studied. Experimental tests were conducted on alumina feedstock with 60vol% powder. Injection molding was carried out at temperatures and pressures of 70–100°C and 0.1–0.6MPa respectively. Results showed that increase in injection temperature and pressure and the resulting increase in flow rate leads to the formation of void which impairs the properties of molded parts. The SEM studies showed that injection at temperature of 100°C results in evaporation of binder components. From the processing point of view, the temperature of 80°C and pressure of 0.6MPa seems to be the most suitable condition for injection molding. In addition, the effects of sintering conditions (temperature and time) on the microstructure and mechanical properties are discussed. The best final properties were found using injection molding under the above stated conditions, thermal debinding and sintering at 1700°C during 3h.

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  9. [해외논문]   High performance shape memory foams with isocyanate-modified hydroxyapatite nanoparticles for minimally invasive bone regeneration   SCI SCIE SCOPUS

    Xie, Ruiqi (Institute of Textiles and Clothing, The Hong Kong Polytechnic University, Hung Hom, Hong Kong, China ) , Hu, Jinlian (Institute of Textiles and Clothing, The Hong Kong Polytechnic University, Hung Hom, Hong Kong, China ) , Ng, Frankie (Institute of Textiles and Clothing, The Hong Kong Polytechnic University, Hung Hom, Hong Kong, China ) , Tan, Lin (Institute of Textiles and Clothing, The Hong Kong Polytechnic University, Hung Hom, Hong Kong, China ) , Qin, Tingwu (State Key Laboratory of Biotherapy, Institute of Stem Cell and Tissue Engineering, West China Hospital, Sichuan University, Chengdu, China ) , Zhang, Mingqiu (Materials Science Institute, Sun Yat-sen University, Guangzhou, China ) , Guo, Xia (Department of Rehabilitation Sciences, The Hong Kong Polytechnic University, Hung Hom, Hong Kong, China)
    Ceramics international v.43 no.6 ,pp. 4794 - 4802 , 2017 , 0272-8842 ,

    초록

    Abstract This study conducts a comprehensive assessment of shape memory polyurethane (SMPU) composite foams with isocyanate-modified hydroxyapatite (imHA) nanoparticles in terms of their pore structures, mechanical properties, shape memory effects and biocompatibility in vitro . The results obtained in the research reveal the effectiveness of imHA nanoparticles in SMPU foams as inorganic cross-linking fillers, which contribute to the enhancement of mechanical properties and shape memory performance. Pore structures and compressive properties are simultaneously optimized when imHA content increases. The imHA enhanced SMPU foam could be adopted as a promising alternative for overcoming the disadvantages of traditional polymer scaffolds, such as insufficient mechanical properties, inadequate pore structure, low bioactivity and inconvenience in operation for bone regeneration.

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  10. [해외논문]   Fabrication of lead-free Ba(Zr0.2Ti0.8)O3–(Ba0.7Ca0.3)TiO3 nanoparticles and the application in flexible piezoelectric nanogenerator   SCI SCIE SCOPUS

    Kou, Yanfei (School of Mechanical and Power Engineering, North University of China, Taiyuan, Shanxi 030051, China ) , Kou, Ziming (College of Mechanical Engineering, Taiyuan University of Technology, Taiyuan 030024, China ) , Zhao, Dongping (School of Mechanical and Power Engineering, North University of China, Taiyuan, Shanxi 030051, China ) , Wang, Zhijian (School of Mechanical and Power Engineering, North University of China, Taiyuan, Shanxi 030051, China ) , Gao, Guijun (College of Mechanical Engineering, Taiyuan University of Technology, Taiyuan 030024, China ) , Chai, Xuejun (Taiyuan Power Supply Company, Taiyuan 030024, China)
    Ceramics international v.43 no.6 ,pp. 4803 - 4806 , 2017 , 0272-8842 ,

    초록

    Abstract Recently, flexible nanogenerators have attracted much attention due to the continuous demand of portable electronic devices. Thus, in our present work, a flexible piezoelectric nanogenerator (pNG) was fabricated by mixing 0.5Ba(Zr 0.2 Ti 0.8 )O 3 -0.5(Ba 0.7 Ca 0.3 )TiO 3 nanoparticles (BCTZ NPs) and a PDMS polymer matrix. The flexible device exhibited excellent performance with maximum open-circuit voltage of 0.6V and short-circuit current of 7.5nA. BCTZ NPs were prepared by a reaction between a metallic salt and a metallic oxide in a solution of composite-hydroxide eutectic. XRD pattern showed BCTZ NPs to have pure perovskite structure. In this paper, the structure, morphology of the BCTZ NPs, and electric property of the BCTZ-based pNG were systematically studied. With the advantages of small-size, environmentally friendly, high flexibility, and high-sensitivity to external vibration, BCTZ will open up a range of new applications.

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