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弹簧式抗扭缓冲装置具有良好的柔性缓冲性能,安装、调试方便,代替10t转炉倾动机构的浮点铰链式抗扭缓冲装置,可减小转炉启动、制动时出现的动载荷、冲击载荷和扭振。 相似文献
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以氧化铁皮形貌、成分和应力状态为切入点,利用SEM、EDS和XRD等手段探究酸洗、拉伸、冷轧方式对钢材表面除鳞效果的影响。结果显示:氧化铁皮由最外层红色Fe_2O_3,中间层磁性Fe_3O_4,以及最内层的FeO组成。盐酸酸洗4 min后表面出现基体钢板斑点,6 min后表面氧化铁皮基本去除,裂纹对酸洗的速度影响较大。相比于盐酸,以磷酸为基底的复合多元酸GF2GF1具有可重复使用、无排放等优点,同时不存在产生裂纹的问题。在变形相同的前提下,压应力的除鳞效果显著好于拉应力,为了达到破鳞效果,必须迫使钢材产生较大变形。 相似文献
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ZnO thin films are deposited on Al/Si substrates by the pulsed laser deposition (PLD) method. The XRD and SEM images of films are examined. Highly c-axis oriented ZnO thin films which have uniform compact surface morphology are fabricated. The size of surface grains is about 30 nm. The Schottky barrier ultraviolet detectors with silver Schottky contacts are made on ZnO thin films. The current-voltage characteristics are measured. The ideality contact factor between Ag and ZnO film is 1.22, while the barrier height is 0.908 e V. After annealing at 600 ℃ for 2h, the ideality factor is 1.18 and the barrier height is 0.988 eV. With the illumination of 325 nm wavelength UV-light, the photocurrent-to-dark current ratios before and after annealing are 140.4 and 138.4 biased at 5 V, respectively. The photocurrents increase more than two orders of magnitude over the dark currents. 相似文献
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本文简述了紧凑式连轧机组液压系统用油的基本性能和选择要点;分析了液压油污染、老化变质的原因以及对液压系统的危害和应采取的防止措施;对定期换油、经验观察法换油和定质换油进行了比较. 相似文献