Abstract A novel continuous directional freeze casting technique derived from LMC (liquid metal cooling) is developed in the present study, which is named as “LMC-like freeze casting”. In this novel freeze casting method, a quartz mold containing slurry is dipped into a low-temperature bath with a constant rate to achieve directional freezing of the slurry. Under quasi-steady state conditions, the solidification front is kept above the liquid level of the low-temperature bath at a constant distance. The heat released during freezing is conducted downward axially within the solidified slurry, and then is conducted axially and radially to the low-temperature bath through the mold wall. As a result, the thermal resistance between the solidification front and the low-temperature bath is kept constant, and the solidification velocity is exactly the same as the dipping rate of the casting mold. With casting molds made from quartz, a good compromise between high casting rate and unidirectional freezing is achieved without introducing complex temperature control systems. To demonstrate the feasibility of the LMC-like freeze casting, long wicks (about 10 cm) with uniform pore size along the freezing direction are freeze-casted from aqueous nickel slurry. Permeabilities and capillary performance parameter of the fabricated wicks are measured, proving that LMC-like freeze casting technique is feasible to fabricate biporous metal wicks with aligned porosity.

中文翻译：

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通过类 LMC 连续定向冷冻铸造制造金属芯

摘要 本研究开发了一种源自LMC（液态金属冷却）的新型连续定向冷冻铸造技术，称为“类LMC冷冻铸造”。在这种新颖的冷冻铸造方法中，将含有浆料的石英模具以恒定速率浸入低温浴中，以实现浆料的定向冷冻。在准稳态条件下，凝固前沿保持在低温浴液面以上恒定距离。冻结过程中释放的热量在凝固的浆液中轴向向下传导，然后通过模具壁轴向和径向传导到低温浴中。结果，凝固前沿和低温浴之间的热阻保持恒定，凝固速度与铸模的浸渍速度完全一致。使用由石英制成的铸模，无需引入复杂的温度控制系统即可在高铸造速率和单向冷冻之间实现良好的平衡。为了证明类 LMC 冷冻铸造的可行性，从含水镍浆中冷冻铸造了沿冷冻方向具有均匀孔径的长芯（约 10 厘米）。测量了制造的芯的渗透率和毛细管性能参数，证明类 LMC 的冷冻铸造技术制造具有对齐孔隙率的双孔金属芯是可行的。在不引入复杂的温度控制系统的情况下实现了高铸造速率和单向冷冻之间的良好折衷。为了证明类 LMC 冷冻铸造的可行性，从含水镍浆中冷冻铸造了沿冷冻方向具有均匀孔径的长芯（约 10 厘米）。测量了制造的芯的渗透率和毛细管性能参数，证明类 LMC 的冷冻铸造技术制造具有对齐孔隙率的双孔金属芯是可行的。在不引入复杂的温度控制系统的情况下实现了高铸造速率和单向冷冻之间的良好折衷。为了证明类 LMC 冷冻铸造的可行性，从含水镍浆中冷冻铸造了沿冷冻方向具有均匀孔径的长芯（约 10 厘米）。测量了制造的芯的渗透率和毛细管性能参数，证明类 LMC 的冷冻铸造技术制造具有对齐孔隙率的双孔金属芯是可行的。