一步烧结法制备梯度结构硬质合金的工艺研究
发布时间：2018-12-11 20:45
【摘要】：从降低生产成本的角度考虑,尝试在真空炉中采用一步烧结法制备梯度结构硬质合金。实验研究了烧结工艺参数对合金显微结构及密度的影响,结果表明:梯度结构硬质合金样品表层的WC晶粒大于富钴层及芯部区域;随着烧结温度升高,样品表层WC晶粒变粗,梯度结构硬质合金密度先增加后降低;延长烧结时间会显著增加样品表层两相区的厚度。本实验所制备的硬质合金梯度层厚度可达1 168μm,烧结时间越长,样品密度越低。
[Abstract]:In order to reduce the production cost, the gradient cemented carbide was prepared by one step sintering in vacuum furnace. The effect of sintering process parameters on the microstructure and density of the alloy was studied experimentally. The results show that the WC grains in the surface layer of the graded cemented carbide are larger than those in the cobalt-rich layer and the core area. With the increase of sintering temperature, the grain size of WC in the surface layer of the sample becomes coarser, the density of the gradient cemented carbide increases first and then decreases, and the thickness of the two-phase region of the surface layer increases significantly when the sintering time is prolonged. The gradient layer thickness of cemented carbide prepared in this experiment can reach 1 168 渭 m. The longer the sintering time is, the lower the sample density is.
【作者单位】： 中南大学粉末冶金研究院;
【分类号】：TG135.5
本文编号：2373192
[Abstract]:In order to reduce the production cost, the gradient cemented carbide was prepared by one step sintering in vacuum furnace. The effect of sintering process parameters on the microstructure and density of the alloy was studied experimentally. The results show that the WC grains in the surface layer of the graded cemented carbide are larger than those in the cobalt-rich layer and the core area. With the increase of sintering temperature, the grain size of WC in the surface layer of the sample becomes coarser, the density of the gradient cemented carbide increases first and then decreases, and the thickness of the two-phase region of the surface layer increases significantly when the sintering time is prolonged. The gradient layer thickness of cemented carbide prepared in this experiment can reach 1 168 渭 m. The longer the sintering time is, the lower the sample density is.
【作者单位】： 中南大学粉末冶金研究院;
【分类号】：TG135.5
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