Cubic boron nitride particles coated by titanium nitride (TiN/cBN) as well as diamond particles coated by titanium carbide (TiC/diamond) were prepared by Ti molten salt deposition followed by heat-treatment process. c...Cubic boron nitride particles coated by titanium nitride (TiN/cBN) as well as diamond particles coated by titanium carbide (TiC/diamond) were prepared by Ti molten salt deposition followed by heat-treatment process. cBN or diamond particles were mixed separately with Ti powders and molten salts (KCl, NaCl and K<sub>2</sub>TiF<sub>6</sub>). The mixture was heated at 900 °C under argon atmosphere. The produced particles were heat-treated under hydrogen at 1000 °C. The morphologies and chemical compositions of the produced particles were investigated by scanning electron microscopy (SEM), X-ray diffraction (XRD) and focused ion beam (FIB). The results show that the cBN and the diamond particles are coated by nano-sized Ti layers. By heat-treatment of the Ti/cBN and TiC/diamond coated particles under hydrogen atmosphere, the deposited Ti layers were interacted by the in-situ transformation reaction with the surfaces of cBN and diamond particles and converted to titanium compounds (TiN and TiC), respectively.展开更多
A cost-effective carbon-free nanocoating strategy was developed for the synthesis of ultra-fine SnO2 coatingα-Fe2O3 core-shell nanoparticles. This strategy only involves a two-step molten salt reaction at low tempera...A cost-effective carbon-free nanocoating strategy was developed for the synthesis of ultra-fine SnO2 coatingα-Fe2O3 core-shell nanoparticles. This strategy only involves a two-step molten salt reaction at low temperature of 300 °C. The as-preparedα-Fe2O3@SnO2 core-shell nanocomposites show enhanced electrochemical performances than the bareα-Fe2O3 nanoparticles. This involved metal oxide nanocoating method is easy to be carried out, and the heat treatment temperature is much lower than that of other traditional solid-state annealing method and many carbon or metal oxide nanocoating methods. The molten salt method may also be used to produce other metal oxides coating nanostructures as the electrode materials for lithium-ion batteries.展开更多
目前核电运行管理系统存在数据接口不统一、设备状态数字化表达程度差等缺陷,为适应未来智慧核电的需要,将数字孪生理论与实时数据对接技术、图形可视化手段相结合,基于钍基熔盐固态仿真堆(Thorium Molten Salt Reactor-Solid Fuel,TMSR...目前核电运行管理系统存在数据接口不统一、设备状态数字化表达程度差等缺陷,为适应未来智慧核电的需要,将数字孪生理论与实时数据对接技术、图形可视化手段相结合,基于钍基熔盐固态仿真堆(Thorium Molten Salt Reactor-Solid Fuel,TMSR-SF0)实例,提出一套完整的数据监控与可视化技术方案。首先,建立熔盐堆反应装置数字映射模型,并完成在Unity引擎的模型对接及虚拟场景渲染;其次,基于Node-EPICS事件驱动与Socket.io套接字实现时空数据关联;最后,基于XCharts可视化框架提出集中显示实时数据的可视化方法,保证数据的可解释性,便于对数据的实时分析。经实践验证,该方案为TMSR-SF0的数据监控系统开发提供了有效技术支撑,数据更新周期为100 ms,且具备全流程数据采集、网络通信、图元动态展示等功能,有助于操作人员对核反应装置的在线监视与运行管理,为核电领域监控技术的数字化转型发展提供了参考。展开更多
文摘Cubic boron nitride particles coated by titanium nitride (TiN/cBN) as well as diamond particles coated by titanium carbide (TiC/diamond) were prepared by Ti molten salt deposition followed by heat-treatment process. cBN or diamond particles were mixed separately with Ti powders and molten salts (KCl, NaCl and K<sub>2</sub>TiF<sub>6</sub>). The mixture was heated at 900 °C under argon atmosphere. The produced particles were heat-treated under hydrogen at 1000 °C. The morphologies and chemical compositions of the produced particles were investigated by scanning electron microscopy (SEM), X-ray diffraction (XRD) and focused ion beam (FIB). The results show that the cBN and the diamond particles are coated by nano-sized Ti layers. By heat-treatment of the Ti/cBN and TiC/diamond coated particles under hydrogen atmosphere, the deposited Ti layers were interacted by the in-situ transformation reaction with the surfaces of cBN and diamond particles and converted to titanium compounds (TiN and TiC), respectively.
基金Projects(51202297,81372464,51472271)supported by the National Natural Science Foundation of ChinaProject(NCET-12-0554)supported by the New Century Excellent Talents in UniversityProject(2013CB932901)supported by the National Basic Research Program of China
文摘A cost-effective carbon-free nanocoating strategy was developed for the synthesis of ultra-fine SnO2 coatingα-Fe2O3 core-shell nanoparticles. This strategy only involves a two-step molten salt reaction at low temperature of 300 °C. The as-preparedα-Fe2O3@SnO2 core-shell nanocomposites show enhanced electrochemical performances than the bareα-Fe2O3 nanoparticles. This involved metal oxide nanocoating method is easy to be carried out, and the heat treatment temperature is much lower than that of other traditional solid-state annealing method and many carbon or metal oxide nanocoating methods. The molten salt method may also be used to produce other metal oxides coating nanostructures as the electrode materials for lithium-ion batteries.
