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采用气氛烧结法制备了无η相梯度WC-Co硬质合金,并通过扫描电子显微镜观察渗碳处理前后样品的微观形貌和WC晶粒尺寸,X射线能谱仪测量Co含量的分布,X射线衍射仪分析样品的相结构,显微硬度计测量样品表面、心部的硬度,X射线应力仪测量样品烧结表面的残余应力,钴磁测量仪和矫顽磁力计测量样品的钴磁值、矫顽磁力,对梯度硬质合金的微观结构和性能进行了分析。结果表明,通过渗碳处理可以制备出无η相的梯度WC-Co硬质合金,WC晶粒有长大的趋势,但长大幅度较小;渗碳处理后合金钴磁值增大,矫顽磁力减小;梯度硬质合金的硬度呈梯度分布,表面硬度显著高于渗碳处理前的硬质合金的平均硬度;梯度硬质合金烧结表面的残余应力为压应力,残余应力数值低于渗碳处理前的硬质合金。
The non-eutectic WC-Co cemented carbide was prepared by the atmosphere sintering method. The microstructure and WC grain size of the sample before and after carburization were observed by scanning electron microscope. The distribution of Co content was measured by X-ray energy dispersive spectrometer. X The phase structure of the sample was analyzed with a ray diffractometer. The hardness of the sample surface and the core was measured with a microhardness tester. The residual stress of the sample sintered surface was measured with an X-ray stress meter. The cobalt magnetic value of the sample was measured with a cobalt magnetometer and a coercive force meter. Coercivity, the microstructure and properties of gradient cemented carbide were analyzed. The results show that the gradient WC-Co cemented carbide without η phase can be prepared by carburizing treatment. The WC crystal grains have the tendency of growing up, The hardness of the gradient cemented carbide gradient distribution, the surface hardness was significantly higher than the average hardness of cemented carbide before carburizing treatment; gradient cemented carbide sintering surface residual stress is compressive stress, the residual stress values below Carburizing before cemented carbide.