Papers by Keyword: B2O3

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Authors: Angela Hardmann, F.H. Hayes
247
Authors: Dong Ying Ju, S. Koga, Pei Bian, T. Mitamura
Abstract: In order to improve the durability of Pt coated Ti electrodes as an anode of the sulfuric acid system electrolysis, tantalum oxide (Ta2O5) additions have been used widely. However that is not enough for uses under severe conditions. In this study,boric acid (H3BO3) was added into the Pt coating during manufacturing process of Ti/Pt-coated electrodes, and the (Pt + B2O3)/Ti electrodes were obtained. The effect of H3BO3 addition on the microstructure, surface area, and lifetime of (Pt + B2O3)/Ti electrodes was also investigated in detail. Commercially available titanium plates (10 100.5mm) were employed for prepare Ti/ (Pt + B2O3) electrodes, where it was confirmed by XRD that B2O3 formed by heating the boric acid was amorphous in the temperature range of 250 to 550. The coating solution of 2 μl of H2PtCl66H2O (Pt:50 g/l) dissolved in butanol and 5~20 mass% H3BO3 mixture was spread over the etched Ti plates. After drying at 70 for 30 min, the substances were heated at 250 to 550 for 10 min. The lifetime of the electrodes was examined by a direct current of 1 A using Pt plate as the counter electrode in 1 M H2SO4 solution at 40. The end of life was determined as the time when the cell voltage changed 2 times of the beginning.
393
Authors: Gang Xiong
Abstract: The effects of B2O3 on the sinter ability and microwave dielectric properties of Ca [(Li1/3Nb2/3)0.92Zr0.08]O3−δ−0.05TiO2 (CLNZ−0.05TiO2) ceramics were investigated. B2O3 doping can effectively reduce sintering temperature by 150~200 °C. The temperature coefficient of resonator frequency τf increased with an increase of B2O3 content and sintering temperature. When B2O3 of 2.5 wt % were added, the optimum microwave dielectric properties: εr =34.2, Qf =15680GHz and τf = − 4.7×10−6/°C were obtained at the sintering temperature of 950 °C.
324
Authors: Cui Wei Li, Yong Huang, Chang An Wang, Shu Qin Li, Qing Feng Zan
395
Authors: Yan Qing Lu, Guo Dong Zhang, Mao Fa Jiang
Abstract: In order to reduce fluorine pollution, partial fluoride could be replaced by B2O3 in mould flux. The effects of B2O3 on properties of low fluoride content mould flux for thin slab continuous casting were studied. The properties included melting temperature, viscous characteristics, fluidity, surface tension and Al2O3 inclusion adsorption. The results showed that with the increase of B2O3 content, melting temperature, viscosity, viscous activation energy and surface tension of mould flux decreased obviously, fluidity increased, and Al2O3 inclusion adsorption of mould flux changed little. The B2O3 could play effective role when its content was less than 6%. The results would play a guiding role in designing of low fluoride content mould flux for thin slab continuous casting.
805
Authors: Chun Qing Peng, Chang An Wang, Liang Qi, Yong Huang
Abstract: In this work, a new method to fabricate high-purity Ti3AlC2 powder by pressureless sintering (PLS) was reported through adding a little amount of B2O3 as a low-temperature aid. The elemental Ti, Al, and active carbon powders were used as raw materials with the molar ratio of 3 : 1.2 : 2. The effect of sintering temperature on the purity of Ti3AlC2 was investigated at the range of 800°C to 1400°C. The results showed that high-purity Ti3AlC2 powders, in which almost no TiC phase could be found, were stably fabricated by pressureless synthesis at 1400°C for 5 mins in flow Ar atmosphere. The roles of B2O3 addition were discussed in the paper.
1247
Authors: A.Y. Sari, D. Ginting, P. Sebayang, P. Sardjono, C. Kurniawan, M.N. Nasrudin
Abstract: The effects of B2O3 addition (0, 0.2, 0.5, 1 and 2 wt %) on the change of microstructure and magnetic properties of barium hexaferrite (BHF) has been made and analyzed. The purpose of this work is to higher the magnetic properties of BHF by B2O3 additive. It was found that the distribution average diameter particle, true density, sintered density, and magnetic flux density of BHF are modified obviously as a small amount of B2O3 is added. The best quality of materials is obtained which 0.5 wt % B2O3 addition and showed excellent properties with average particle size of 1.78 µm , true density of 5.00 g/cm3, sintered density of 4,66 g/cm3, and flux density of 722.5 Gauss. Furthermore, the surface morphology by SEM revealed that the grain is around 1.2 µm and more homogeneity. The results can be interpreted that the preferential addition of B2O3 at low level is 0.5 wt%.
65
Authors: Wen Cheng J. Wei, Chih Lung Chen, Andreas Roosen
Abstract: La2O3-Al2O3-B2O3 (LAB) glass with Al2O3 particulates is a lead-free, non-alkali, and low-sintering temperature glass-ceramic system, which has been developed for LTCC application. The glass melting and sintering process window of the LAB systems were investigated. A systematic study on the wetting behaviors of the LAB glass on alumina plate, microstructures and crystallization in the glass-ceramics had also been conducted. The densification and crystallization temperatures of the glass-ceramics took place as low as 800oC. The interface condition of layer glass-ceramics with Ag electrode was also characterized. No obvious interfacial diffusions were observed.
929
Authors: Jian Yang, Ji Kang Yan, Jing Hong Du, Fang Chun Yan, Kun Yong Kang, Jian Hong Yi, Guo You Gan
Abstract: To lower the sintering temperature of ZnNb2O6 microwave dielectric ceramic, ZnNb2O6 doped with B2O3 were prepared by the traditional solid state reaction method. The effects of the amount of B2O3 (0.25-5.0wt.%) on the microstructure, density and electrical performances were investigated. The results show that a pure columbite ZnNb2O6 phase was obtained for all B2O3-doped ceramics. The microwave dielectric properties reached the maximum values of εr = 24.1, Q×f = 19502 GHz, τf = -52.19 ppm/°C for 1wt% B2O3-doped ZnNb2O6 ceramic sintered at 1050 °C for 4 h. All of evidences suggest that the enhancement of microwave dielectric properties is due to the enhanced ions-energy and ionic diffusion with the increase of sintering temperature. Furthermore, B2O3 doping can generate liquid phase and reduce the activation energy of diffusion to promote the materials sintering.
209
Authors: Gang Xiong
Abstract: The effects of B2O3 on the sinterability and microwave dielectric properties of Ca [(Li1/3Nb2/3)0.95Zr0.05]O3−δ ceramics were investigated. B2O3 doping can effectively reduce sintering temperatue by 150~200oC. The temperature coefficient of resonator frequency τf increased with an increase of B2O3 content and sintering temperatue. When B2O3 of 2wt% were added, the optimum microwave dielectric properties: εr =28.7,Qf =13580GHz and τf = − 7.8×10−6/oC were obtained at the sintering temperature of 950oC.
314
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