In situ Fabrication of a Dense/Porous Bi‐layered Ceramic Composite using Freeze Casting of a Ceramic–Camphene Slurry
In situ Fabrication of a Dense/Porous Bi‐layered Ceramic Composite using Freeze Casting of a Ceramic–Camphene Slurry
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DOI：
10.1111/j.1551-2916.2005.00785.x
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发表时间：
2006-02
影响因子：
3.9
通讯作者：
Young-Hag Koh;In-Kook Jun;Jong-Jae Sun;Hyoun‐Ee Kim
中科院分区：
文献类型：
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作者：
Young-Hag Koh;In-Kook Jun;Jong-Jae Sun;Hyoun‐Ee Kim
采用低温铸造低固含量（Φ = 20 vol%）的陶瓷/莰烯浆料原位制备了致密/多孔双层陶瓷复合材料。在55°C的温度下，通过球磨制备热浆液，并在25°C的温度下将其浇注到模具中，在模具中，铸造体的顶表面暴露在空气中，以允许熔融莰烯的受控蒸发。这种简单的方法在顶层产生了高固含量，可以忽略不计的camphene （Φ > 50 vol%），而在内部区域保持了低固含量，固化了camphene （Φ ~ 20 vol%）。烧结样品在厚度约1.7 mm的高孔层上形成了一层厚度为125 μm的致密陶瓷层，并形成了三维互连的孔道，代表了固化莰烯的纠缠枝晶生长。
Dense/porous bi-layered ceramic composites were fabricated in situ by freeze casting a ceramic/camphene slurry with a low solid content (Φ = 20 vol%). The warm slurry was prepared at 55°C by ball milling and cast into a mold at 25°C, where the top surface of the cast body was exposed to air to allow for the controlled evaporation of molten camphene. This simple method produced a high solid content with negligible camphene (Φ > 50 vol%) on the top layer, while maintaining a low solid loading with solidified camphene (Φ∼20 vol%) in the inner region. The sintered sample showed a dense 125-μm-thick ceramic layer on a highly porous layer with a thickness of ∼1.7 mm and three-dimensionally interconnected pore channels that were representative of entangled dendritic growth of the solidified camphene.