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排序方式: 共有4170条查询结果,搜索用时 31 毫秒
81.
82.
Gang Liu Huamin Zhang Hexiang Zhong Jingwei Hu Dongyan Xu 《Electrochimica acta》2006,51(26):5710-5714
A novel Pt4ZrO2/C catalyst was prepared and compared with 20 wt.% Pt/C in terms of the sintering resistance and corrosion resistance. To evaluate their sintering resistance and corrosion resistance properties, an accelerated ageing test (AAT) was performed. The catalysts before and after AAT were characterized by cyclic voltammetry (CV), rotating disk electrode (RDE) and X-ray diffraction (XRD). After AAT, the dissolution rate of Pt and Zr in H3PO4 media (105 wt.%, 204 °C) was characterized by inductively coupled plasma-atomic emission spectroscopy (ICP-AES). The electrochemical area (ECA) changes of thin film electrodes based on Pt4ZrO2/C and Pt/C catalysts were also evaluated using continuous CV sweep technique. All the results showed that Pt4ZrO2/C has higher sintering resistance and corrosion resistance than Pt/C. ‘Anchor effect’ is proposed to explain the enhanced effect of ZrO2 in Pt4ZrO2/C binary catalyst compared with Pt/C that contain platinum alone. 相似文献
83.
84.
85.
Z. F. Zhang Z. M. Sun H. Hashimoto T. Abe 《Journal of the European Ceramic Society》2002,22(16):2957-2961
To synthesize Ti3SiC2 samples, pulse discharge sintering (PDS) technique was utilized to sinter elemental powders of Ti/Si/C with stoichiometric and off-stoichiometric ratios in a temperature range of 1200–1500 °C. The results showed that high purity Ti3SiC2 could not be obtained from the Ti/Si/C powder with molar ratio of 3:1:2, and Ti3SiC2 preferred to form at relatively low sintering temperature for a short time. When 5Ti/2Si/3C and 3Ti/1.5Si/2C powders were sintered for 15 min, the TiC content was respectively decreased to 6.4 and 10 wt.% at 1250–1300 °C. The corresponding relative density of the samples sintered from 5Ti/2Si/3C powder was calculated to be as high as 99% at the temperature above 1300 °C. It is suggested that low-temperature rapid synthesis of Ti3SiC2 would be possible through the PDS technique, provided that the composition of the starting powders should be adjusted to be off-stoichiometric ratio from 3:1:2. 相似文献
86.
杨立 《太原重型机械学院学报》2010,(2):111-113
高校贫困学生救助体系的实施关系到我国高等教育改革的稳定和发展而备受关注。通过对大学贫困生救助体系、救助程序、救助主导思想中存在的问题的进行探讨,提出了相应的对策,同时指出:在物质扶贫的基础上,要关注贫困生精神领域的贫困,从根本上解决贫困生问题。 相似文献
87.
《Ceramics International》2019,45(10):13315-13318
Full densification of Y2O3 is challenging and requires a very high sintering temperature (above 1700 °C). In this study, the effect of ZnO and TiO2 dopants on its densification was investigated, showing that both dopants lowered the sintering temperature and improved the process. Moreover, ZnO promoted the grain growth, while TiO2 inhibited it; hence, the ZnOTiO2 co-doping and the change in the ZnO/TiO2 ratio allowed the control of the sintered body microstructure while maintaining high densification. Since Y2O3 has a higher plasma erosion resistance than conventional Si-based materials, the plasma dry etching resistance of the sintered Y2O3 was also evaluated and found superior due to the improved densification and controlled grain size of the doped samples. 相似文献
88.
Lise T. Sagdahl Mari-Ann Einarsrud Tor Grande 《Journal of the European Ceramic Society》2006,26(16):3665-3673
The sintering properties of La1−xSrxFeO3−δ (x = 0.1, 0.25) mixed conductors have been investigated with particular emphasis on the effect of secondary phases due to cation non-stoichiometry (±5 mol% La excess and deficiency). Secondary phases, located at grain boundaries in cation non-stoichiometric materials, increased the sintering temperature compared to single-phase materials. Extensive swelling in final stage of sintering was observed in all materials, which resulted in micro-porous materials. The swelling was most pronounced in the phase pure and two-phase materials due to La-deficiency, while refractory secondary phases in La-excess materials inhibited both sintering, grain growth and swelling. In La-deficient materials, formation of molten secondary phases resulted in rapid swelling due to viscous flow. The present findings demonstrated the importance of controlling sintering temperature and time, as well as careful control of the cation stoichiometry of La1−xSrxFeO3−δ in order to achieve fully dense and homogenous La1−xSrxFeO3−δ ceramics. 相似文献
89.
运用红外线微型烧结法对白云鄂博铁精矿烧结液相流动特性进行研究。通过在烧结原料中添加纯化学试剂研究不同Al2O3与SiO2含量之比对烧结液相流动性的影响。结果表明,Al2O3含量的增加虽然促进了烧结液相量的增多,但同时提高了液相的粘度,随着铝硅比的增加烧结试样的液相流动性降低。通过对试样气孔大小的对比,揭示了烧结过程中气孔形成与烧结矿液相流动特性的关系,粘度是控制气孔形成的重要因素。气孔的形成过程伴随着液相在气孔壁上的物理化学反应,气孔直径减小使烧结试样液相流动性变差。 相似文献
90.
胡成建 《徐州建筑职业技术学院学报》2014,(2):73-76
在分析现阶段我国知识产权法律援助制度现状的基础上,指出了其中存在的不足,并从建立健全法律制度,统筹确立运作模式,扩大援助对象范围,构建合理的工作机制,以及加大普及宣传力度等方面提出了相关的措施. 相似文献