The Experts below are selected from a list of 15675 Experts worldwide ranked by ideXlab platform
Xiaohui Wang - One of the best experts on this subject based on the ideXlab platform.
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Sintering Behavior of bulk SrBi2Ta2O9 prepared by solid-state reaction
Ceramics International, 2003Co-Authors: Xiaohui WangAbstract:Abstract The conventional solid-state reaction method has been used to prepare bulk SrBi 2 Ta 2 O 9 ceramics. The Sintering Behavior and decomposition of bulk SrBi 2 Ta 2 O 9 ceramics have been investigated. Higher Sintering temperature (>1200 °C) and longer Sintering time (>7 h) can result in decomposition of SrBi 2 Ta 2 O 9.
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The Sintering Behavior of SrBi2Ta2O9 associated with synthesis temperature of its powder in solid-state reaction
Materials Letters, 2002Co-Authors: Xiaohui WangAbstract:Abstract Different synthesis temperatures of powders may have an effect on the Sintering Behavior and properties of materials. In this paper, SrBi2Ta2O9 have been synthesized at different temperatures by the solid-state reaction method. In order to find the effect of synthesis temperature on the Sintering Behavior, the powders obtained at different synthesis temperature are pressed into pellets and sintered at different temperatures. The results show that with the synthesis temperature increasing, the pellets tend to possess low density and decomposition start at a lower temperature.
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Structure, Sintering Behavior and dielectric properties of silica-coated BaTiO3
Materials Letters, 2002Co-Authors: Renzheng Chen, Xiaohui Wang, Ai-li Cui, Zhilun GuiAbstract:Abstract Silica was homogeneously coated on the surface of barium titanate (BaTiO 3 , BT) fine particles via sol–gel method. The thickness of silica film was about 5 nm. High-resolution transmission electron microscope (HRTEM) investigation and energy dispersion spectrometry (EDS) analysis proved that there was silica coated on BaTiO 3 . The coating mechanism is that after BaTiO 3 hydrolyzed slightly, Na 2 SiO 3 gelatinized on the surface of TiO 2− x . Compared with pure BaTiO 3 , the coating process can improve Sintering Behavior and flatten temperature coefficients (TC) curves of ceramics based on BaTiO 3 .
Tsang-tse Fang - One of the best experts on this subject based on the ideXlab platform.
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The defect structure, Sintering Behavior, and dielectric responses of Cr2O3-doped Sr0.5Ba0.5Nb2O6
Journal of Applied Physics, 2006Co-Authors: Tsang-tse Fang, Fung-yu ChenAbstract:Sr0.5Ba0.5Nb2O6 (SBN50) with and without Cr2O3 dopant had been prepared by the solid-state reaction. The structural variations of undoped and Cr2O3-doped SBN were examined by the x-ray diffractometer. As the Cr2O3 content increases, the lattice parameters remain almost unchanged initially but become greatly changed revealing the increase in a axis and the decrease in c axis when the Cr2O3 content is >1mol%, which was mainly influenced by the created oxygen vacancies. Isothermal Sintering Behavior of undoped and Cr2O3-doped SBN50 has been investigated. It was found that the creation of the charge-compensated oxygen vacancies and the accompanied structural change had a significant influence on the Sintering Behavior. The direct jumping path through vacant O sites (path 2 in Fig. 9) was further considered as the main reason for the enhancement of the densification rate and slight increase of the activation energy when the Cr2O3 content is ≦1mol% and the decrease of the densification rate but great increase o...
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Effect of the Strontium:Barium Ratio and Atmosphere on the Sintering Behavior of Strontium Barium Niobate
Journal of the American Ceramic Society, 2005Co-Authors: Wen Jiung Lee, Tsang-tse FangAbstract:The Sintering Behavior of SrxBa1−xNb2O6 (SBN) (x= 0.5, 0.6, and 0.7) was studied. The densification rate increased and the evaluated activation energy of SBN decreased as the Sr:Ba molar ratio increased. Also, when SBN50 (SBN where x= 0.5) was sintered at
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Effects of processing on the Sintering Behavior, microstructures, and properties of La0.67Sr0.33MnO3 doped with ZrO2
Journal of Magnetism and Magnetic Materials, 2003Co-Authors: Tsang-tse Fang, Ming-tzong WangAbstract:Abstract Two different doping methods were used to study the effect of ZrO 2 on the Sintering Behavior, microstructure, and properties of La 0.67 Sr 0.33 MnO 3 (LSMO). For specimens of ZrO 2 -doped LSMO, it was found that the solubility of ZrO 2 in LSMO is limited, so the properties are not much affected but the Sintering Behavior are influenced by the liquid phase of MnO 2 , the residue of ZrO 2 , and pore growth. For specimens of LSMZO, the significant substitution of Zr for Ti would reduce the densification rate, lower T p and T c , and enhance magnetoresistance (MR). The mechanisms for the decrease of T p and increase of MR are suggested.
Zhipeng Xie - One of the best experts on this subject based on the ideXlab platform.
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Sintering Behavior and mechanical properties of spark plasma Sintering SiO2-MgO ceramics
Ceramics International, 2020Co-Authors: Zijun Peng, Xudong Luo, Zhipeng Xie, Mengmeng YangAbstract:Abstract SiO2-MgO ceramics containing different weight fractions (0, 0.5, 1, 2, and 4 wt%) of SiO2 powder were prepared by mixing nano MgO powder, and the powder mixtures were densified by spark plasma Sintering (SPS). The effect of SiO2 addition and SPS method on the Sintering Behavior, microstructure and mechanical properties were investigated. Results were compared to specimens obtained by conventional hot pressing (HP) under a similar Sintering schedule. The highest relative density, flexural strength and hardness of 2 wt% SiO2-MgO ceramics reached 99.98%, 253.99 ± 7.47 MPa and 7.56 ± 0.21 GPa when sintered at 1400 °C by SPS, respectively. The observed improvement in the Sintering Behavior and mechanical properties are mainly attributed to grain boundary "strengthening" and intragranular "weakening" of the MgO matrix. Furthermore, the spark plasma Sintering temperature could be decreased by more than 100 °C as compared with the HP method, SPS favouring enhanced grain boundary sliding, plastic deformation and diffusion in the Sintering process.
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Effect of molar ratios of MgO/Al2O3 on the Sintering Behavior and thermal shock resistance of MgOAl2O3SiO2 composite ceramics
Materials Chemistry and Physics, 2017Co-Authors: Dong Feng, Xudong Luo, Guodong Zhang, Zhipeng XieAbstract:Abstract In order to determine the relationship between the property of MgOAl 2 O 3 SiO 2 composite ceramics and molar ratios of MgO/Al 2 O 3 , especially the Sintering Behavior and thermal shock resistance, the MgOAl 2 O 3 SiO 2 composite ceramics were fabricated with micro-size MgO, Al 2 O 3 powder and nano-size SiO 2 as main raw materials. The sample was characterized by phase analysis, densification and thermal shock times. Moreover, field emission scanning electron microscope was also conducted to study microstructure of the samples before and after thermal shock. Effect of different molar ratios of MgO/Al 2 O 3 on the Sintering Behavior and thermal shock resistance of composite ceramics were investigated. The results showed that the sample possess better Sintering Behavior and thermal shock resistance with the molar ratio of MgO/Al 2 O 3 equal to 2/1. Grains of periclase and spinel were directly bonded together, resulting in a dense and compact microstructure, and the bulk density of obtained sample reached 3.4 g/cm 3 . The microstructure of sample after thermal shock revealed that the crack propagation path was deflected and bifurcated, the main-crack propagation was restricted and more fracture energy was consumed, the thermal shock resistance of composite ceramics was greatly improved.
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Pressureless Sintering Behavior of Injection Molded Alumina Ceramics
Science of Sintering, 2014Co-Authors: Wei Liu, Zhipeng XieAbstract:The pressureless Sintering Behaviors of two widely used submicron alumina (MgOdoped and undoped) with different solid loadings produced by injection molding have been studied systematically. Regardless of the sinterability of different powders depending on their inherent properties, solid loading plays a critical role on the Sintering Behavior of injection molded alumina, which greatly determines the densification and grain size, and leads to its full densification at low temperatures. As compared to the MgO-doped alumina powder, the undoped specimens exhibit a higher sinterability for its smaller particle size and larger surface area. While full densification could be achieved for MgO-doped powders with only a lower solid loading, due to the fact that MgO addition can reduce the detrimental effect of the large pore space on the pore-boundary separation.
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The Effect of Nano-Al2O3 on Sintering Behavior and Mechanical Property of ZrO2 Ceramics
Key Engineering Materials, 2014Co-Authors: Hong Yan Sun, Bo Wang, Feng Rui Zhai, Zhipeng XieAbstract:The effect of addition nanoAl2O3 on Sintering Behavior and mechanical property of ZrO2 was studied. It was shown that the addition of nanoAl2O3 with the Al2O3 content from 0.5mol% to 2.0mol% in ZrO2 ceramics could accelerate the Sintering of ZrO2 and increase the flexural strength and fracture toughness of ZrO2. ZrO2 added with 1.0mol% nanoAl2O3 has the maximum in strength of 650MPa and toughness of 15MPa·m1/2 sintered at 1450°C. Compared with undoped ZrO2 being sintered at 1500°C, the strength and toughness was improved by 12% and 18%, respectively.
Mengmeng Yang - One of the best experts on this subject based on the ideXlab platform.
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Sintering Behavior and mechanical properties of spark plasma Sintering SiO2-MgO ceramics
Ceramics International, 2020Co-Authors: Zijun Peng, Xudong Luo, Zhipeng Xie, Mengmeng YangAbstract:Abstract SiO2-MgO ceramics containing different weight fractions (0, 0.5, 1, 2, and 4 wt%) of SiO2 powder were prepared by mixing nano MgO powder, and the powder mixtures were densified by spark plasma Sintering (SPS). The effect of SiO2 addition and SPS method on the Sintering Behavior, microstructure and mechanical properties were investigated. Results were compared to specimens obtained by conventional hot pressing (HP) under a similar Sintering schedule. The highest relative density, flexural strength and hardness of 2 wt% SiO2-MgO ceramics reached 99.98%, 253.99 ± 7.47 MPa and 7.56 ± 0.21 GPa when sintered at 1400 °C by SPS, respectively. The observed improvement in the Sintering Behavior and mechanical properties are mainly attributed to grain boundary "strengthening" and intragranular "weakening" of the MgO matrix. Furthermore, the spark plasma Sintering temperature could be decreased by more than 100 °C as compared with the HP method, SPS favouring enhanced grain boundary sliding, plastic deformation and diffusion in the Sintering process.
Hae Weon Lee - One of the best experts on this subject based on the ideXlab platform.
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Effect of internal and external constraints on Sintering Behavior of thin film electrolytes for solid oxide fuel cells (SOFCs)
Ceramics International, 2014Co-Authors: In Yeop Kim, Mridula Biswas, Jongsup Hong, Kyung Joong Yoon, Ji-won Son, Jong-ho Lee, Byung-kook Kim, Hae Weon LeeAbstract:Abstract The effect of internal and external constraints on the Sintering Behavior of yttria-stabilized zirconia (YSZ) thin film electrolytes is investigated for intermediate-temperature solid oxide fuel cells (SOFCs). The external constraints imposed by rigid substrates result in major process flaws, such as vertical and delamination cracks during film densification, in a chemical solution deposition (CSD) process. In this study, YSZ nanoparticles are incorporated into the precursor solution to impose internal constraints and control the shrinkage rate of the sol–gel matrix. Because the structural stability of the thin film is determined by the grain size distribution, it is critical to optimize the content and dispersion structure of the nanoparticles and the Sintering temperature to obtain a gas-tight thin film electrolyte for SOFCs. A clustering model is proposed to obtain a comprehensive understanding of the Sintering Behavior of the YSZ thin-film electrolyte containing the nanoparticles in the CSD process.