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61.
分析了海绵钛生产过程中影响氯含量的几个主要因素,即原料、还原料速、蒸馏周期、产品包装等,结合生产实践阐述了在生产过程中对海绵钛产品氯含量的控制措施。 相似文献
62.
讨论了水洗真空度对水洗工艺的影响,提出水洗真空系统的改造原则,并对真空系统改造设计思路和方案进行了详细的探讨。通过改进和优化能够提高设备的使用率,最终达到缩短水洗时间,提高本工序产能的目的。 相似文献
63.
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66.
Au atoms were vaporized by electron beam evaporation, and their subsequent growths on Si (111 ) and highly ordered pyrolytic graphite (HOPG) substrates were studied using atomic force microscopy. Results show that Au nanoparticles tend to nucleate and grow regularly along the step edges of HOPG, however, nanoparticles are distributed homogeneously over the whole Si substrate. The possibility of controlled growth of Au in ultrahigh vacuum with peculiar surface structures was preseuted. 相似文献
67.
Scanning electron microscope (SEM) tribometric data on polycrystalline silicon (poly-Si) vs. poly-Si, Si(100) vs. Si(100)
and Si(111) vs. Si(111) interfaces, obtained in
Torr and in 0.2 Torr partial pressure of hydrogen gas (
) from room temperature to 850°C, were performed under standard and much slower thermal ramping rates. The friction data were analyzed per the methodology
described in part I of this paper series. The results indicate a highly beneficial friction- and wear-reducing regime within
a relatively narrow thermal region. This desirable region coincides with some chemisorption of excited species of molecular
hydrogen just before the mass thermal desorption of surface hydrides. These data represent the tribochemical equivalent of
a method routinely used in electronics, whereby deep electron traps (dangling Si bonds) are passivated by baking in molecular
hydrogen. The
also exerts a moderating influence on the size of the friction noise at all test temperatures. However, the general level
of friction beyond the beneficial thermal region is high. In parallel, the general wear rate of Si representative of the entire
range of standard thermal ramping in both atmospheric environments is in the extremely high 10-12m3/(N m) range. Operating strictly in the beneficial, low-friction thermal regime resulted in a several orders-of-magnitude
reduction in the wear rate over those measured under standard thermal ramping conditions. Although the results confirm previous
findings that Si is not a good material of construction for miniaturized moving mechanical assemblies (e.g., microbearings
and gears), there seems to be some limited possibility of gas-phase lubrication of Si micromechanisms with rarefied hydrogen
at surface temperatures between 100 and 300°C.
This revised version was published online in July 2006 with corrections to the Cover Date. 相似文献
68.
原 RH真空室烘烤装置升降小车采用齿轮齿条传动方式或链轮链条传动方式 ,都曾多次发生事故 ,改用液压推杆——链条传动方式后使用效果很好。 相似文献
69.
采用真空烧结工艺制备了Ti(C,N)基金属陶瓷,研究了原始成分组成对材料烧结特性和力学性能的影响规律。结果表明:保持Mo/(Mo+Ni)为定值,随着硬质相成分的增加,烧结体抗弯强度降低,硬度增加;硬质相成分TiN含量超过一定阈值时,烧结体疏松导致硬度和抗弯强度同时大幅下降;TiN含量保持定值,硬质相成分含量增加,烧结体硬度增加,抗弯强度下降;粘结相成分用Co部分替代Ni,随Co含量的增加,烧结体硬度略有升高的基础上抗弯强度升高。 相似文献
70.
The three–dimensional flow field of molten steel in an 80–ton single snorkel vacuum refining furnace has been mathematically simulated to attain the optimal configuration and operation parameters, such as the bottom blowing Ar flow rate, the eccentric position of bottom blowing Ar port at ladle bottom, the single snorkel inner diameter, and the single snorkel immersion depth into molten steel. The mathematical simulation results show that a stable flow field of molten steel can be achieved in 70–second; meanwhile, the maximal circulation intensity of molten steel in the 80–ton single snorkel vacuum refining furnace can be found on a cross–section with y as 0 mm based on the middle of ladle bottom as circular point of the Cartesian space coordinate under the condition of injecting Ar gas on x coordinate considering the asymmetry of flow field for molten steel in the single snorkel vacuum refining furnace. The recommended parameters of the 80–ton single snorkel vacuum refining furnace with ideal circulation intensity as 970.1 kg/s are the bottom blowing Ar flow rate as 450–500 Nl/min, the eccentric position of bottom blowing Ar port as 250 mm, the single snorkel inner diameter as 1000 mm, and the single snorkel immersion depth as 500 mm. 相似文献