95%氧化铝陶瓷烧结过程中的表面晶粒织构生长及相场法仿真

Texture Grain Growth on the Surface of 95% Alumina Ceramic during the Sintering and Its Phase-field Simulation

本文报道了一种CaO+SiO_2共添加的95%氧化铝陶瓷烧结过程中表面呈现的晶粒织构生长现象:(006)晶面平行于样品表面的晶粒优先生长。对该现象的机理进行了讨论:这可能和(006)晶面形成的表面具有更低表面能有关。采用多相场模型,将表面能的差异归于自由能密度的差异中,对95%氧化铝陶瓷烧结过程中出现了表面晶粒织构生长进行了仿真研究,得到的仿真结果与个别取向的晶粒优先生长的实验结果一致。

Texture grain growth on the surface of a CaO+SiO 2 co-doped 95% alumina ceramic during the sintering process was reported. The grains with the basal plane parallel to the surface had precedence in growth. The mechanism behind this phenomenon was discussed and might be attributed to the surface having a lower energy when it was composed by the basal plane. Considering the difference of the surface energy in the free energy function, the texture grain growth on the surface of the 95% alumina ceramic was simulated using multiphase-field model in this paper. The results achieved were in good accordance with the experimental results of the texture grain growth.