Ink-jet printing of ceramic thick films is one of low cost on-site ceramic pattern fabrication methods.It is necessary to investigate the rheological behaviour of ceramic inks and drying behaviour of droplets.Two kind...Ink-jet printing of ceramic thick films is one of low cost on-site ceramic pattern fabrication methods.It is necessary to investigate the rheological behaviour of ceramic inks and drying behaviour of droplets.Two kinds of BaTiO3 ceramic inks were prepared by mechanical mixing and sol-gel methods,respectively.The effect of preparation parameters,such as quantity of polyacrylic acid(PAA)and solid content,on physicochemical and rheologic properties of the ceramic inks was investigated.The results show that they satisfy the requirements of continuous ink-jet printing.The appearances of printed dots and single printed layers were observed by SEM.The SEM images indicate that dots printed with mixing method ink are in ring shape,and dots printed with sol-gel method ink are in pancake shape,so the printed layer surface with the latter ink is smoother.The causes of these phenomena were discussed.展开更多
In this paper, M-type hexagonal barium ferrite powders are synthesized using the sol-gel method. A dried precursor heated in air is analyzed in the temperature range from 50 to 1200 ℃ using thermo-gravimetric analysi...In this paper, M-type hexagonal barium ferrite powders are synthesized using the sol-gel method. A dried precursor heated in air is analyzed in the temperature range from 50 to 1200 ℃ using thermo-gravimetric analysis and differential scanning calorimetry. The effects of the additives and the cacinating temperature on the magnetic properties are investigated, and the results show that single-phase barium ferrite powders can be formed. After heat-treating at 950 ℃ for 4h with 3 wt% additive, the coercivity and saturation magnetization are found to be 440 Oe and 57.9 emu/g, respectively.展开更多
A series of doped barium hexaferrites BaFe12-2xMnxSnxO19 （x = 0.0-1.0） particles were prepared by the co-precipitation/molten salt method. The particle size and crystalline of the samples BaFe12-2xMnxSnxO19 decrease...A series of doped barium hexaferrites BaFe12-2xMnxSnxO19 （x = 0.0-1.0） particles were prepared by the co-precipitation/molten salt method. The particle size and crystalline of the samples BaFe12-2xMnxSnxO19 decrease with an increase in the doping amount x. When x is less than 0.8, the pure BaFe12-2xMnxSnxO19 particles with hexagonal plate morphology are obtained. The effects of substitution on magnetic properties were evaluated and compared to nomal BaFe12O19. The specific magnetizations （Ms） of doped materials have been significantly improved. Among all these compositions, the BaFe10.4Mn0.8Sn0.8O19 sample has the highest Ms value of 81.8 A？m2？kg-1 at room temperature and its intrinsic coercivity （Hc） is 44.5 kA？m-1. The as-prepared doped barium ferrites exhibit a low temperature coefficient of coercivity close to zero. The coercivity is independent of temperature when x is in the a range 0.5-0.7.展开更多
采用冷冻干燥法结合固相烧结制备了具有层状孔结构的多孔钛酸钡压电陶瓷,研究了固含量对陶瓷的相组成、微观结构、介电和铁电性能的影响。随着固含量的增加,所制备的陶瓷孔径、气孔率均减小,介电常数和极化强度均随气孔率的增大而减小...采用冷冻干燥法结合固相烧结制备了具有层状孔结构的多孔钛酸钡压电陶瓷,研究了固含量对陶瓷的相组成、微观结构、介电和铁电性能的影响。随着固含量的增加,所制备的陶瓷孔径、气孔率均减小,介电常数和极化强度均随气孔率的增大而减小。在气孔率为67%、频率为100 k Hz、居里温度TC=121℃时,最大介电常数降为571.88,相比于致密钛酸钡陶瓷介电常数有所降低,而介电损耗并未明显增大;在30 kV/cm场强下,剩余极化强度Pr为2.00μC/cm^(2)。通过孔结构的设计,实现了多孔钛酸钡压电陶瓷得介电可调性。所制备的多孔压电陶瓷可利用内部交联孔道和压电效应在污水过滤中实现循环使用,亦可在水声换能、声呐探测、生物医学等诸多方面得到应用,具有很广泛的应用前景。展开更多
基金Project(106151)supported by the Major Program of the Ministry of Education of ChinaProject(59842001)supported by the National Natural Science Foundation of China
文摘Ink-jet printing of ceramic thick films is one of low cost on-site ceramic pattern fabrication methods.It is necessary to investigate the rheological behaviour of ceramic inks and drying behaviour of droplets.Two kinds of BaTiO3 ceramic inks were prepared by mechanical mixing and sol-gel methods,respectively.The effect of preparation parameters,such as quantity of polyacrylic acid(PAA)and solid content,on physicochemical and rheologic properties of the ceramic inks was investigated.The results show that they satisfy the requirements of continuous ink-jet printing.The appearances of printed dots and single printed layers were observed by SEM.The SEM images indicate that dots printed with mixing method ink are in ring shape,and dots printed with sol-gel method ink are in pancake shape,so the printed layer surface with the latter ink is smoother.The causes of these phenomena were discussed.
基金Project supported by the National Basic Research Program of China(Grant No.2007CB310407)the Science Fund for Creative Research Groups of the National Natural Science Foundation of China(Grant No.61021061)+1 种基金the National Natural Youth Fund of China(Grant No.61001025)National Programs for Science and Technology Development of Guangdong Province,China(Grant No.2010B090400314)
文摘In this paper, M-type hexagonal barium ferrite powders are synthesized using the sol-gel method. A dried precursor heated in air is analyzed in the temperature range from 50 to 1200 ℃ using thermo-gravimetric analysis and differential scanning calorimetry. The effects of the additives and the cacinating temperature on the magnetic properties are investigated, and the results show that single-phase barium ferrite powders can be formed. After heat-treating at 950 ℃ for 4h with 3 wt% additive, the coercivity and saturation magnetization are found to be 440 Oe and 57.9 emu/g, respectively.
基金Funded by National Natural Science Foundation of China (Nos.20801016, 20701013, and 60971020)Postdoctoral Foundation of Heilongjiang Province(No. LRB07-231)Fundamental Research Funds for the Central Universities(No.HEUCF201210010)
文摘A series of doped barium hexaferrites BaFe12-2xMnxSnxO19 （x = 0.0-1.0） particles were prepared by the co-precipitation/molten salt method. The particle size and crystalline of the samples BaFe12-2xMnxSnxO19 decrease with an increase in the doping amount x. When x is less than 0.8, the pure BaFe12-2xMnxSnxO19 particles with hexagonal plate morphology are obtained. The effects of substitution on magnetic properties were evaluated and compared to nomal BaFe12O19. The specific magnetizations （Ms） of doped materials have been significantly improved. Among all these compositions, the BaFe10.4Mn0.8Sn0.8O19 sample has the highest Ms value of 81.8 A？m2？kg-1 at room temperature and its intrinsic coercivity （Hc） is 44.5 kA？m-1. The as-prepared doped barium ferrites exhibit a low temperature coefficient of coercivity close to zero. The coercivity is independent of temperature when x is in the a range 0.5-0.7.
文摘采用冷冻干燥法结合固相烧结制备了具有层状孔结构的多孔钛酸钡压电陶瓷,研究了固含量对陶瓷的相组成、微观结构、介电和铁电性能的影响。随着固含量的增加,所制备的陶瓷孔径、气孔率均减小,介电常数和极化强度均随气孔率的增大而减小。在气孔率为67%、频率为100 k Hz、居里温度TC=121℃时,最大介电常数降为571.88,相比于致密钛酸钡陶瓷介电常数有所降低,而介电损耗并未明显增大;在30 kV/cm场强下,剩余极化强度Pr为2.00μC/cm^(2)。通过孔结构的设计,实现了多孔钛酸钡压电陶瓷得介电可调性。所制备的多孔压电陶瓷可利用内部交联孔道和压电效应在污水过滤中实现循环使用,亦可在水声换能、声呐探测、生物医学等诸多方面得到应用,具有很广泛的应用前景。
