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采用微波加热氮化烧结技术制备了功能梯度WC-15%TiC-6%Co硬质合金(MW-FGM-YT15)。通过扫描电镜、X射线衍射仪对试样的显微组织、相组成进行了观察,在往复式摩擦磨损试验机上,研究了在干摩擦条件下功能梯度硬质合金与合金钢GCr15对摩时的摩擦学性能,考察了摩擦速度和载荷对其摩擦磨损性能的影响。结果表明:采用微波氮化烧结处理,可快速制备功能梯度硬质合金,表面形成厚度12~19μm的层。在试验的载荷和转速范围内,随转速或载荷的增加,MW-FGM-YT15试样与YT15试样的摩擦系数均降低,但MW-FGM-YT15试样的摩擦系数低于YT15试样的摩擦系数。当F=100 N,v=800 r/min时,MW-FGM-YT15的摩擦系数μ约为0.235。
Functionally graded WC-15% TiC-6% Co cemented carbide (MW-FGM-YT15) was prepared by microwave heating nitridation sintering. The microstructure and phase composition of the samples were observed by scanning electron microscopy and X-ray diffractometer. On the reciprocating friction and wear testing machine, the effects of friction between the functional graded cemented carbide and GCr15 alloy on dry friction Tribological properties, the impact of friction speed and load on the friction and wear properties were investigated. The results show that the functionalized hardmetal can be rapidly prepared by microwave nitriding sintering and the surface is formed with a layer with a thickness of 12 ~ 19μm. The friction coefficient of MW-FGM-YT15 sample and YT15 sample decreased with the increase of rotational speed or load in the range of load and speed under test. However, the friction coefficient of MW-FGM-YT15 sample was lower than that of YT15 Friction coefficient. The friction coefficient μ of MW-FGM-YT15 is about 0.235 when F = 100 N and v = 800 r / min.