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宁云龙 《机械工人(热加工)》2002,(4):21-21
2001年4月的一段时间,我厂的工件在盐浴淬火、回火后的发黑前的浸泡过程中残盐很难浸泡溶解掉,尤其是某些工件内较小的孔洞,如阀套的小孔(见图1)、阀芯的中心孔(见图2),其内残盐以前只需几 相似文献
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投标活动可以反映出一个建筑企业的综合实力 ,投标工作做的好与坏 ,直接关系到企业的生存与发展。因此 ,如何搞好投标工作 ,特别是如何提高中标率 ,是众多建筑企业经营者们共同关心的问题 相似文献
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Heat treatment of carbon nanotubes (CNTs) was carried out under ammonia atmosphere and then CNTs were modified by Triton x-100 (CNTs-T). Ni-B amorphous alloy catalysts supported on CNTs and CNTs-T were prepared by impregnation-chemical reduction method. The catalysts were characterized by TEM, ICP, XRD, BET and CO chemisorption, and studied in the acetylene selective hydrogenation. The results show that homogeneous Ni-B amorphous particles with mean size about 10 nm are successfully prepared on CNTs-T. Compared with Ni-B/CNTs, nickel loading of Ni-B/CNTs-T is increased by about 14.6%. Furthermore, the activity and selectivity of Ni-B/CNTs-T are much higher than those of Ni-B/CNTs in the acetylene selective hydrogenation under comparative condition. 相似文献
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输出轴是摆线液压马达的关键零件之一,在工作中不仅传递扭矩,还要承受较大的弯曲应力、接触应力及一定的冲击,故热处理的质量对其力学性能和使用寿命有决定性的影响。BM30型电动机输出轴(见附图)是我公司各种输出轴中较为特殊的一种(其他输出轴无A区槽)。该输出轴的内花键齿偶有断裂,而其他输出轴却无此情况发生。 相似文献
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