Porous Si₃N₄ ceramics with unidirectionally aligned channels were prepared via freezing ceramics suspension with distinct solid contents under different freezing temperatures. The samples obtained using lower solid content in ceramic suspension at higher freezing temperature exhibit larger Darcian and non‐Darcian constants due to their higher open porosity, larger pore size and lower tortuosity. Moreover the investigation on individual contributions of viscous energy losses and inertial energy losses on the total pressure drop during permeation process indicates that with decreasing the solid content or the freezing temperature the viscous energy losses increase but the inertial energy losses decrease for samples owing to the differences in their pore structures. It is worth mentioning that porous Si₃N₄ ceramics with unidirectionally aligned channels exhibit larger Darcian and non‐Darcian constants than those with similar pore size distributions and open porosity owing to their lower tortuosity, thus rendering them appropriate for filters and membrane supports.

中文翻译：

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具有单向排列通道的多孔氮化硅陶瓷的微观结构和气体渗透性能

多孔Si ₃ N ₄通过在不同的冷冻温度下冷冻具有不同固体含量的陶瓷悬浮液，可以制备出具有单向排列通道的陶瓷。在较高的冷冻温度下，使用陶瓷悬浮液中较低固含量的样品，由于其较高的开孔率，较大的孔径和较低的曲折度，因此具有较大的Darcian和非Darcian常数。此外，对粘性能量损失和惯性能量损失对渗透过程中总压降的贡献的研究表明，随着固含量或冷冻温度的降低，粘性能量损失增加，但样品的惯性能量损失由于差异而减小在它们的孔结构中。值得一提的是多孔Si ₃ N ₄ 具有单向排列通道的陶瓷由于其较低的曲折度而比具有相似孔径分布和开孔率的陶瓷具有更大的Darcian和非Darcian常数，因此使其适合用于过滤器和膜载体。