共查询到18条相似文献,搜索用时 91 毫秒
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纳米WC-Co硬质合金研究现状 总被引:2,自引:0,他引:2
综述纳米硬质合金的研究开发概况及应用。重点介绍纳米WC和WC-Co粉体的制备方法和烧结工艺,指出要成功地制备纳米硬质合金,关键在于抑制烧结过程中WC晶粒的长大。简要介绍纳米硬质合金的应用前景。 相似文献
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采用W18Cr4V高速钢刀具、硬质合金类刀具、陶瓷刀具和PCBN刀具进行了Fe-1.0Ni-0.5Mo低合金烧结钢车削对比试验,研究了切削速度、进给量与加工表面粗糙度的关系。得出陶瓷刀具加工低合金烧结钢能兼顾加工效率和刀具性价比两个方面,是粗加工和半精加工的首选。PCBN刀具在精加工时,能表现出优越性,硬质合金刀具可以在加工毛料时使用。 相似文献
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通过纳米粉末活化法制备了超粗晶硬质合金,并采用扫描电镜、万能试验机和维氏硬度计等检测方法对其进行微观组织及力学性能的表征,研究了WC原料粒度对超粗晶硬质合金微观组织和力学性能的影响。结果表明:随着烧结温度的升高,合金中的WC平均晶粒尺寸增大,WC晶粒间邻接度先减小后基本不变,Co相平均自由程先减小后基本不变,抗弯强度先增大后减小,硬度减小;随着WC原料粒度的增大,合金中的WC平均晶粒尺寸增大,WC晶粒间邻接度增大,Co相平均自由程增大,抗弯强度减小,硬度减小;当WC原料粒度为12~15μm、烧结温度为1450℃时,可以制备出平均晶粒尺寸6.80μm、抗弯强度2735MPa的超粗晶硬质合金。 相似文献
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利用放电等离子烧结技术尝试烧结出了超细纯碳化钨粉。研究表明该技术所烧结的无黏结相超细碳化钨材料工艺简单,组织精细,致密度高,硬度高,可以用作优异的硬质材料。 相似文献
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Sung Jung Heo 《Journal of Mechanical Science and Technology》2008,22(7):1383-1390
Environmentally conscious hard turning and technology has placed more importance on the machining process. In this research,
the possibility of environmentally conscious hard turning of cemented carbides was studied. The effects of cutting methods
of dry and wet (vegetable oil mist, and mineral oil) and work material on cutting resistance and wear characteristics of cutting
tools were experimentally investigated. The turning and micro-cutting process in SEM was carried out by using four kinds of
tungsten carbides with the PCD cutting tools. Specifically, an emphasis was put on the effect of WC and Co additives in four
kinds of cemented carbides on machinability and tool wear characteristics. The tool wear width and the cutting resistances
were measured, and the worn flank was observed. 相似文献
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采用灰色系统参数识别的方法,以材料的物理机械性能作为分析参数,对国产YT类和YG类硬质合金刀具材料与ISO标准牌号硬质合金之间的对应关系进行分析.结果与传统的依据材料成分的分类方法基本一致,为国际间参考使用硬质合金材料提供了理论依据。 相似文献
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作为传统硬质合金主要粘结剂的Co资源稀缺且价格昂贵,因此寻找Co的代用品具有重要意义。本文综述了以Ni代Co的WCNi系硬质合金的研究现状,包括其发展变革、制备方法、性能特点和应用领域,并指出了目前存在的问题。 相似文献
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WC cemented carbides are used extensively to improve abrasion resistance. Co content and WC grain size influence the mechanical properties of the cemented carbides. In this study, the effects of Co content and WC grain size of cemented carbide on wear were examined. We prepared 13 different cemented carbides with different Co content and WC grain size. Wear tests were carried out against 0.45% carbon steel under dry condition at 98 N and 232 mm/s. From the results, we found that wear increased with both Co content and WC grain size. Specific wear rate of the cemented carbides tested was in the range of 10−7 mm3/(N m). We discussed the wear properties with hardness and the mean free path of the cemented carbide. These two parameters alone cannot explain the wear property. 相似文献
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