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使用真空气氛滑轨管式炉将YG6刀片分别加热到750、850、950、1050℃,保温2 h,然后室温冷却。通过扫描电镜(SEM)、能谱仪(EDS)、X射线粉末衍射仪(XRD)、纳米压痕仪对硬质合金表面进行表征,并利用Image-J软件分析Co黏结相的变化。结果表明:加热后YG6表面产生脆性缺碳相(η相),部分fcc-Co转变为hcp-Co,导致硬质合金和金刚石薄膜的界面处易发生断裂。当温度达950℃后,表面Co含量大量上升,并且表面的硬度和弹性模量明显下降。
YG6 blades were heated to 750, 850, 950 and 1050 ° C using a vacuum atmosphere tube furnace, respectively, and incubated for 2 h, then cooled at room temperature. The surface of the cemented carbide was characterized by scanning electron microscopy (SEM), energy dispersive spectrometer (EDS), X-ray powder diffraction (XRD) and nanoindentation. The changes of the Co binder phase were analyzed by Image-J software. The results show that the brittle phase (η phase) and the fcc-Co phase transition to hcp-Co on the YG6 surface after heating, resulting in the easy fracture at the interface between cemented carbide and diamond films. When the temperature reaches 950 ℃, the surface Co content increases a lot, and the surface hardness and elastic modulus decreased significantly.