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Bi-Si-B-O系溶胶-凝胶玻璃及其熔融-淬火玻璃的结构对比 被引量:1
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作者 李倩 袁鸽成 +2 位作者 骆志捷 邓南林 张普 《广东工业大学学报》 CAS 2015年第3期133-136,146,共5页
采用溶胶-凝胶法(Sol-Gel)和熔融-淬火法分别制备了Bi-Si-B-Zn-Al-O系玻璃粉体,运用XRD、SEM、EMAX、IR、DSC/TG等手段对粉体进行了表征,并初步探讨了同体系不同制备方法下两种玻璃粉体的微观结构的异同.结果表明,两种玻璃粉体均呈玻... 采用溶胶-凝胶法(Sol-Gel)和熔融-淬火法分别制备了Bi-Si-B-Zn-Al-O系玻璃粉体,运用XRD、SEM、EMAX、IR、DSC/TG等手段对粉体进行了表征,并初步探讨了同体系不同制备方法下两种玻璃粉体的微观结构的异同.结果表明,两种玻璃粉体均呈玻璃态,溶胶-凝胶粉体颗粒较易破碎,球磨12 h后可得到1~10μm范围的颗粒,其元素含量与实验设计比例较为接近;两种粉体玻璃网络结构相似,主要以[Bi O3]三角体、[Si O4]四面体、[BO4]四面体构成基本网络骨架;熔融-淬火玻璃结构中[Si O4]四面体趋向于架状,使得粉体结构更加稳定,玻璃转化温度略高于溶胶-凝胶玻璃且均小于600℃. 展开更多
关键词 溶胶-凝胶 熔融-淬火 Bi-Si-B-O玻璃体系 玻璃结构
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Microstructure and magnetic properties of directly quenched Nd_2Fe_(14)B/α-Fe nanocomposite materials at different temperatures
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作者 盛洪超 曾夑榕 +1 位作者 靳朝相 钱海霞 《Journal of Central South University》 SCIE EI CAS 2014年第4期1275-1278,共4页
Directly quenched Nd9.5Fe81Zr3B6.5 nanocomposite permanent magnets were prepared under different melt treatment conditions, i.e., the melt temperature was varied prior to ejection onto the quenching wheel. The effect ... Directly quenched Nd9.5Fe81Zr3B6.5 nanocomposite permanent magnets were prepared under different melt treatment conditions, i.e., the melt temperature was varied prior to ejection onto the quenching wheel. The effect of quenching temperature on the microstructure and magnetic properties of the alloys was studied by X-ray diffractometry, transmission electron microscopy and magnetization measurements. It is found that a finer and more uniform microstructure can be obtained directly from the melt quenched at lower temperature. With increasing initial quenching temperature, the optimal quenching speed decreases and the microstructure of the ribbons becomes coarser and more irregular. As a result, the magnetic properties of the alloys are deteriorated. It is believed that the break of the pre-existing Nd2Fe14B clusters and decrease in number of the developing nuclei of Nd2Fe14B phase with increase in quenching temperature may be the causes for the change of the microstructure and the magnetic properties of the ribbons. 展开更多
关键词 microstructure nanocomposite magnet quenching temperature
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n型填充方钴矿热电材料的快速制备研究(英文) 被引量:7
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作者 姚铮 仇鹏飞 +1 位作者 李小亚 陈立东 《无机材料学报》 SCIE EI CAS CSCD 北大核心 2016年第12期1375-1382,共8页
如何有效控制方钴矿基热电材料的制备成本成为其商业化应用的瓶颈。本课题组采用一种简单并且可放量的方法来制备n型填充方钴矿热电材料。该法由感应熔融淬、火和放电等离子烧结(SPS)组成,制备周期(少于30 min)远小于传统制备方法:电阻... 如何有效控制方钴矿基热电材料的制备成本成为其商业化应用的瓶颈。本课题组采用一种简单并且可放量的方法来制备n型填充方钴矿热电材料。该法由感应熔融淬、火和放电等离子烧结(SPS)组成,制备周期(少于30 min)远小于传统制备方法:电阻炉熔融(超过24 h),退火(1 w)和SPS。该法同传统制备工艺相当,制备的方钴矿块体材料具有相对均匀的物相成份和组织结构,以及良好的热电性能,这得益于将经历感应熔融、淬火冷凝工艺形成的Sb/CoSb/CoSb_2包晶偏析结构破坏,能同时实现快速反应和致密化。良好的热电性能和较少的生产周期及能耗,使该法有望发展成为具有潜在应用前景的填充方钴矿热电材料工业化制备工艺。 展开更多
关键词 填充方钴矿材料 熔融-淬火/放电等离子烧结 微观组织结构 热电性能
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Melting Behavior of PA6 and PA6/PE Blends Crystallized from Amorphous State
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作者 仇武林 罗运军 +4 位作者 罗善国 谭惠民 李政军 麦堪成 曾汉民 《Journal of Beijing Institute of Technology》 EI CAS 1999年第1期56-60,共5页
Aim To investigate the melting behavior of polyamide 6 in polyamide 6/polyethy lene blends crystallized from amorphous state. Methods DSC was used to test effects of annealing temperature, annealing time, DS... Aim To investigate the melting behavior of polyamide 6 in polyamide 6/polyethy lene blends crystallized from amorphous state. Methods DSC was used to test effects of annealing temperature, annealing time, DSC scan rate, and the step wise annealing on the melting peaks of the ice water quenched specimens. Results and Conclusion Varied melting peaks of PA6 component were obtained. The degree of perfection and the crystallization degree of PA6 crystals decreased in the blends, and the crystallization degree of PA6 increased with the increasing of the annealing time. The height of the upper melting peak of reference PA6 is higher than that in blends. 展开更多
关键词 polyamide 6 BLENDS QUENCH melting behavior
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Electrochemical impedance spectra of V_2O_5 xerogel films with intercalation of lithium ion 被引量:1
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作者 张勇 刘玉文 +1 位作者 程玉山 胡信国 《Journal of Central South University of Technology》 2005年第3期309-314,共6页
Vanadium pentoxide xerogel films used for lithium rechargeable batteries were prepared from crystalline c-V2O5 by melt quenching method,then the electrochemical process of lithium intercalation into vanadium pentoxide... Vanadium pentoxide xerogel films used for lithium rechargeable batteries were prepared from crystalline c-V2O5 by melt quenching method,then the electrochemical process of lithium intercalation into vanadium pentoxide xerogel films was simulated with an equivalent circuit model, which was derived from the mechanism of electrode reactions. Measured electrochemical impedance spectra at various electrode potentials were analyzed by using the complex non-linear least-squares fitting method. The results show that impedance spectra consist of 2 high-to- medium frequency depressed arcs and a low frequency straight line. The high frequency arc is attributed to the absorption reaction of lithium ions into the oxide film, the medium frequency arc is attributed to the charge transfer reaction at the vanadium oxide/electrolyte interface and the low frequency is characterized by a straight line with a phase angle of 45° corresponding to the diffusion of lithium ion through vanadium oxide phase. The experimental and calculated results are compared and discussed focusing on the electrochemical performance and the state of charge of the electrode. Moreover, the high consistence of the fitted values of the model to the experimental data indicates that this mathematical model does give a satisfying description of the intercalation process of vanadium pentoxide xerogel films. 展开更多
关键词 vanadium pentoxide xerogel films electrochemical impedance spectra equivalent circuit melt quenching method lithium rechargeable batteries
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