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纳米硬质合金摩擦磨损与切削性能研究 总被引:3,自引:0,他引:3
摩擦磨损性能、磨削性能、切削性能对纳米硬质合金实用化具有极其重要意义。应用摩擦磨损试验机研究了纳米硬质合金WC-7Co和WC-10Co的摩擦磨损性能,利用在线电解修整(Electrolytic in Process Dressing, ELID)磨削技术对纳米硬质合金刀具进行了刃磨,并且对Al/SiCp复合材料进行了切削试验,研究了纳米硬质合金刀具的切削性能与刀具磨损机理。结果表明:纳米硬质合金整体摩擦系数低,耐磨性好,WC-10Co的磨损机理表现为鱼鳞状塑性流动;纳米硬质合金磨削加工性较好,磨削机理以塑性去除为主;纳米硬质合金刀具磨损机理为Al/SiCP复合材料中SiC颗粒对刃口断续冲击,其切削实质是断续切削,刀具磨损形式是刃口破损及晶粒脱落。纳米硬质合金刀具适于低速断续切削。 相似文献
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We investigate reactive fluorine atom spectroscopic characterization in atmospheric pressure of He/SF 6 plasma using atomic emission spectrometry. As input radio frequency (RF) power levels are raised from 140 to 220 W, the emission spectra of 685.60 (3p4D→3s4P transition) and 739.87 nm (3p4P→3s4P transition) increase significantly. Moreover, an optimal value of SF 6 volume concentration in the production of fluorine radicals, which is 0.8% is achieved. Addition of certain amounts of O 2 into He/SF 6 plasma results in the promotion of SF 6 dissociation. Emission intensities of fluorine atoms show the maximum at the O 2 /SF 6 ratio of 0.4. 相似文献
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