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采用不含氮硬质合金原料,通过在梯度烧结工艺之前添加一步微压氮化烧结工艺制备脱β层梯度硬质合金;采用SEM观察合金表层的组织结构,图像分析工具测量脱β层的厚度。结果表明:在添加微压(氮气分压为0.5kPa)氮化烧结工艺的情况下,编号Co-8梯度硬质合金在1 420、1 450、1 480℃,1h的烧结工艺下形成脱β层的厚度分别为8、13、24μm;而编号Co-6梯度硬质合金在1 420℃时所形成的脱β层的厚度接近于零,在其他两种烧结温度下,所形成的脱β层的厚度也明显低于编号Co-8梯度硬质合金。与添加Ti(C,N)的原料相比,在相同的烧结工艺下,本文所采用的不含氮原料制备梯度硬质合金的脱β层厚度也明显降低。
A non-nitrogen carbide cemented carbide raw material was used to prepare desiliconized β-cemented carbide by adding a micro-pressure nitriding sintering process before the gradient sintering process. The microstructure of the alloy surface was observed by SEM. The thickness of desiluted β layer . The results show that under the conditions of micro-pressure nitriding sintering at a nitrogen partial pressure of 0.5kPa, the Co-8 gradient cemented carbide forms de-β at the sintering process of 1 420, 1 450, 1 480 ℃ and 1 h Layer thickness of 8,13,24μm; and Co-6 gradient cemented carbide at 1 420 ℃ when the formation of β-layer thickness is close to zero at the other two sintering temperature, the formation of off β The thickness of the layer is also significantly lower than that of the Co-8 gradient cemented carbide. Compared with the raw materials added with Ti (C, N), the thickness of desorbing β layer of gradient cemented carbide prepared by this method is also decreased obviously under the same sintering process.