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991.
992.
高能球磨LaNi5-34%(质量分数)Mg的相组成与热稳定性能 总被引:1,自引:0,他引:1
采用X射线衍射仪(XRD)、扫描电子显微镜(SEM)、差热分析(DTA)等方法研究了高能球磨及热处理等对新型合金LaNi5-34%(质量分数)Mg的相组成、形貌及热稳定性能等的影响。结果表明:经100r/min球磨100h及190r/min球磨100h后,样品由La、Mg、Ni等非晶。微量的晶体Ni和MgNi2相组成,所得粉末的形状大多为规则的球形或近球形,其颗粒直径范围为0.05~33.0μm。球磨样品具有较好的室温活化特性,其最大电化学放电容量为460mAh/g。该样品经763K保温35d后,得到热稳定性较好的具有纳米尺度的MgNi2、Mg2Ni、Mg2NiLa三相组织,其平均晶粒直径为21.3nm。 相似文献
993.
微波固化环氧树脂(E44/DDM)的热性能及膨胀性能 总被引:11,自引:0,他引:11
利用微波辐照固化环氧E44/二苯甲烷二胺(DDM)体系,考察了固化温度、固化时间以及微波功率之间的关系,分析了固化过程。利用FT-IR、DSC、热膨胀仪分别表征了体系的固化度、玻璃化转变温度(Tg)、热分解温度以及热膨胀系数(α)。结果表明,与热固化过程相比,微波能显著提高E44/DDM的固化速度,缩短凝胶化时间。且微波固化物具有较高的热分解温度和较低的线膨胀系数α。 相似文献
994.
Xiaoyu Li Thomas Scott Shao Yang Chris Cromer Marla Dowell 《Journal of research of the National Institute of Standards and Technology》2004,109(4):429-434
We briefly explain the fundamentals of detector nonlinearity applicable to both electrical and optical nonlinearity measurements. We specifically discuss the attenuation method for optical nonlinearity measurement that the NIST system is based upon, and we review the possible sources of nonlinearity inherent to thermal detectors used with high-power lasers. We also describe, in detail, the NIST nonlinearity measurement system, in which detector responsivity can be measured at wavelengths of 1.06 µm and 10.6 µm, over a power range from 1 W to 1000 W. We present the data processing method used and show measurement results depicting both positive and negative nonlinear behavior. The expanded uncertainty of a typical NIST high-power laser detector calibration including nonlinearity characterization is about 1.3 %. 相似文献
995.
The magnetoresistance (MR) variation of Co/Cu/Co/CoNbZr spin valves as a result of rapid thermal annealing has been investigated. MR ratio of 3.8% was obtained in the as-deposited sample and a considerable increase to 6.86% was observed in the 450°C×60 s treated sample. Microstructure studies show that the enhancement of MR ratio is a consequence of the nano-crystallization of amorphous CoNbZr soft layer. The nano-crystallized CoNbZr possess fine and dense microstructure and excellent electrical and soft magnetic properties which leads to the MR enhancement. With increasing annealing temperature or annealing time, interface roughness caused by rapid grain growth decrease the MR ratio rapidly. XRD studies imply that the interfusion of Cu atom into the Co layer is another possible degradation mechanism of Co/Cu/Co/CoNbZr spin valves at annealing temperature beyond 550°C. 相似文献
996.
M2 cast high speed steel was inoculated by addition of rare earth(RE)‐Al‐N, network eutectic carbides were eliminated, matrix structures were refined and the segregation of tungsten and molybdenum elements were relieved. In the condition that the hardness did not decrease, impact toughness obviously increased. Quenching at 1180 °C and three‐times tempering at 560 °C, the hardness of M2 cast high speed steel kept 65~66HRC, impact toughness reached 21.3J/cm2. Modified M2 cast high speed steel had excellent thermal fatigue resistance and high temperature wear resistance. Roll made in modified M2 cast high speed steel had excellent service effect using in slit rolling mill stand of hot rolling bar mill. 相似文献
997.
马民 《有色冶金设计与研究》2004,25(2):39-41
对现浇混凝土构件在温度、收缩变形作用引起裂缝的原因进行了分析,提出了在设计和施工中应采取的控制措施。 相似文献
998.
导辊磨损原因分析及改善方法 总被引:2,自引:0,他引:2
通过对导辊工作条件和温度场的分析,找出了导辊磨损过快的原因在于工作时导辊温度过高,提出了以改善冷却条件为导辊磨损过快问题的解决方法。 相似文献
999.
Spectroscopic ellipsometry has long been recognized as the technique of choice to characterize thin films and multilayers. Instrumentation for the next generation of VUV lithography at 157 nm requires special optical setup since O2 and H2O are extremely absorbing below 190 nm. A new system has been developed which works into a purged glove box to reduce the oxygen and water contamination in the part per million range. Ellipsometric and photometric measurements vs. wavelength and angle of incidence can be performed. Grazing X-ray option has been added on the same instrument to provide a better picture of the analyzed samples. This paper presents in detail the new system with its two measurement methods, and includes experimental results gate dielectrics layers and high k dielectrics. 相似文献
1000.
NO reduction experiment was performed by injecting ammonia radicals, which were externally generated by flowing the NH3 gas diluted with Ar gas through a dielectric barrier discharge with a one-cycle sinusoidal-wave power source. The discharge was intermittently formed between coaxial cylindrical electrodes with a space of 1.5 mm at an applied peak-to-peak voltage of 3-25 kV. The generated radicals were injected into simulation gas (NO/O2/N2). The simulation gas contained 0-5.6% O2, and the effect of O2 on NOx removal was discussed. The minimum reaction temperature for NO reduction was low when simulation gas contained O2. High O2 concentration (O2=5.6%) in simulation gas, high repetition rate to NH3, and high applied power to NH3 decreased NO removal efficiency. 相似文献