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改变硬质合金烧结工艺控制的几个关键因素,通过测量合金的理化性能,利用扫描电镜分析合金的内部结构,研究了烧结气氛(真空,N_2)、烧结温度、烧结压力对硬质合金梯度结构和机械性能的影响。结果表明,对于含氮硬质合金的梯度烧结,适时引入一定量的氮气可抑制合金中含氮物质的早期分解,可用氮压来控制梯度增长速率,烧结气氛中氮气压力适宜控制在100～200 mbar;随着烧结温度的提高,合金的致密度和脱β层梯度厚度增加明显,合金抗弯强度增加;随着烧结压力的增大,合金脱β层梯度厚度变薄。
By changing the physical and chemical properties of the alloy and analyzing the internal structure of the alloy by scanning electron microscopy, the effects of the sintering atmosphere (vacuum, N 2), sintering temperature and sintering pressure on the cemented carbide gradient structure And the impact of mechanical properties. The results show that for the gradient sintering of nitrogen-containing cemented carbide, a certain amount of nitrogen can be introduced timely to suppress the early decomposition of the nitrogen-containing material in the alloy, and the gradient growth rate can be controlled by the nitrogen pressure. The nitrogen pressure in the sintering atmosphere is suitably controlled at 100-200 mbar. With the increase of the sintering temperature, the density of the alloy and the gradient of desorbing β layer increased obviously, and the bending strength of the alloy increased. With the increase of the sintering pressure, the gradient of the desorbing β layer became thinner.