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由于PcBN材料优异的性能,使PcBN刀具在制造加工行业有着独特的优势。目前PcBN复合片主流的制备方法为高温高压一次烧结法。按照结合剂种类,PcBN材料分为金属型、陶瓷型和金属+陶瓷型。金属+陶瓷型PcBN综合了金属型和陶瓷型的性能优点,被广泛的研究。PcBN的结合剂也由单一体系发展为现在的多元化体系,并涌现出一些新型结合剂,结合剂材料也成为PcBN材料性能优劣的关键因素。文章介绍了PcBN的分类,概述了PcBN材料的优异性能和应用,最后对PcBN材料的国内外研究现状与进展进行了阐述,为后面的研究者提供了一些经验。 相似文献
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立方氮化硼(cBN)特性综述 总被引:4,自引:0,他引:4
氮化硼是由氮原子和硼原子所构成的晶体,化学组成为43.6%的硼和56.4%的氮,具有四种不同的变体:六方氮化硼(hBN)、菱方氮化硼(rBN)、立方氮化硼(cBN)和纤锌型氮化硼(wBN)。文章对cBN的晶体结构、物理机械特性、光学性质、电学性质、热学性质、化学性质以及cBN晶体中杂质物相与hBN中B2O3含量的关系等做了简要的综述性描述,以便我们对cBN的基本特性有一个初步的了解。 相似文献
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为了解决钛合金磨削高温和模具黏附问题,提高其切削加工性能,通过在树脂立方氮化硼(CBN)磨具中加入不同含量的聚四氟乙烯(PTFE)作为固体润滑剂,并对其进行力学性能测试,研究PTFE添加量对树脂CBN磨具磨削性能的影响。结果表明:PTFE润滑作用明显;当PTFE添加量为6 g时,树脂CBN磨具的摩擦力和摩擦系数显著降低,磨具磨削性能显著改善。 相似文献
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钎焊立方氮化硼砂轮作为电镀立方氮化硼砂轮的替代产品,具有优越的性能特点.文章总结了国内外学者在焊立方氮化硼的钎机理、工艺方案以及钎料选择等方面的研究内容,并对钎焊立方氮化硼砂轮的研究需要解决的几个关键问题做出了阐述. 相似文献
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影响cBN晶体生长及其特性的因素很多.文章就用Mg3N2作触媒对cBN晶体得量和质量的影响、AlN添加物和不同气氛对cBN合成的影响、硼酐参与下cBN的形成、硅参与下cBN结晶过程等进行研究;对纤锌矿型氮化硼(wBN)参与下由hBN形成cBN的动力学以及VB族等价杂质元素对cBN单晶机械特性的影响等问题进行阐述. 相似文献
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全面介绍了轮胎用纤维骨架材料静态、动态力学性能,分析了纤维骨架材料的性能与轮胎性能的关系。 相似文献
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全面介绍了轮胎用纤维骨架材料静态、动态力学性能 ,分析了纤维骨架材料的性能与轮胎性能的关系 相似文献
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《Diamond and Related Materials》2007,16(3):421-424
A sp2 bonded boron nitride (sp2 BN) surface layer is sometimes observed on top of cubic boron nitride (cBN) grains for BN films deposited using ion-assisted PVD techniques. Understanding the formation of such surface layer gives a clue to the cBN growth mechanisms. In the current study, the microstructure and phase composition near the top surface of several BN films were investigated in order to clarify the formation mechanism of such a surface layer. All the films investigated were synthesized using ion-assisted PVD techniques, but with different deposition parameters. It was found that such a surface layer is not necessarily present in some of the cBN growth, and its presence depends on the bombardment of ion energy during deposition. The cBN growth mechanisms are discussed based on these observations. 相似文献
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全面介绍了轮胎用纤维骨架材料静态、动态力学性能,分析了纤维骨架材料的性能与轮胎性能的关系。 相似文献
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《Journal of Adhesion Science and Technology》2013,27(3):271-292
A literature review shows that the main arguments used to describe viscoelastic behavior of polymer composites are the existence of an interphase and/or physico-chemical matrix-reinforcement interactions. The purpose of this investigation was to study the influence of both of these parameters on the viscoelastic behavior of a sandwich structure. Using a theoretical approach of the mechanical coupling between phases in laminate composites, the interphase influence is shown to be negligible. In order to understand the influence of an interphase on viscoelastic features of laminates, some metal/polymer/metal laminates were processed under various conditions to obtain different degrees of metal/polymer adhesion. Dynamic mechanical spectroscopy tests reveal that both the amplitude of the main loss factor peak and the low temperature apparent modulus increase with the adhesion. Finite elements calculations show that discontinuities of displacements at the metal/polymer interface explain the loss peak changes. The continuity of displacements is ensured only from a threshold value of the peel energy. 相似文献
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全面介绍了轮胎用纤维骨架材料静态,动态力学性能,分析了纤维骨架材料的性能与轮胎性能的关系。 相似文献