Liquid phase co-sintering compatibility is one of the key technological problems in producing functionally graded materials(FGM), which is meaningful for studying the theoretical model. On the basis of the existing liquid phase sintering, LPM and solid phases co-sintering model, a liquid phase co-sintering model is established according to the basic parameters including the grain radius, the relative density and the liquid volume fraction. The methodologies and techniques described can be applied to simulate and predict the composition gradients and density during liquid phase co-sintering, which can be testified by YG cemented carbide experiment. The result shows that the density and Co content of the material in the both ends of the co-sintering sample interface presents gradient variation, which is in agreement with the variation of the calculation fitting. The established model can predict Co content of the YG8 cemented carbide and the gradient variation change rule of the density.%目前液相共烧结工艺相容性问题是限制功能梯度材料制备技术的关键问题之一，研究其理论模型具有重要的意义。基于现有液相烧结、液相迁移和固相共烧结模型的分析，提出了以颗粒半径、相对密度和液相体积分数为基本参数的液相共烧结模型，模拟预测了液相共烧结两端异种材料致密化和液相迁移的过程，并通过YG类硬质合金实验加以验证。实验结果表明：共烧结试样界面两端材料的密度及Co含量呈现梯度变化，其梯度分布与计算拟合的变化趋势一致，本研究建立的模型较准确地预测了YG8梯度硬质合金Co含量和密度沿梯度方向的变化规律。
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