The highly porous Si₃N₄ ceramic foams were prepared by direct foaming with mixed surfactants. The surface tension and viscosity of slurries were tailored by different carbon chain length of surfactants and different mean Si₃N₄ particle size to achieve the pore size controlling. The nearly linear relationship between the pore size and the ratio of surface tension to viscosity was observed, which indicates that the pore size could be precisely tailored by the slurry properties. Si₃N₄ ceramic foams with porosity of nearly 94%, mean pore size of 110–230 µm, and compressive strength of 1.24–3.51 MPa were obtained.

中文翻译：

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表面活性剂和粒径对高孔隙率Si3N4泡沫​​组织和强度的影响

通过与混合表面活性剂直接发泡来制备高度多孔的Si ₃ N ₄陶瓷泡沫。通过不同表面活性剂的碳链长度和不同的平均Si ₃ N ₄粒径来调整浆料的表面张力和粘度，以实现孔径控制。观察到孔径与表面张力与粘度之比之间几乎呈线性关系，这表明可以通过浆料性质精确地调整孔径。获得了孔隙率接近94％，平均孔径为110-230 µm，抗压强度为1.24-3.51 MPa的Si ₃ N ₄陶瓷泡沫。