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采用粉末冶金与造孔技术相结合的方法成功制备出具有双孔径分布的高孔隙率镍钛毛细芯。研究NaCl添加量及钛含量对毛细芯微观结构及毛细抽吸性能的影响。分析多孔芯中的热传递机制并提出了一种在不产生负面影响的前提下降低金属毛细芯导热系数的新方法。结果表明,增加NaCl添加量可提高镍钛芯的抽吸性能,而钛含量的增加对其影响较小。当NaCl添加量相同时,镍钛芯中的固溶度随着钛含量的增加而增大,进而导致镍钛毛细芯的导热系数明显低于纯镍芯且随着钛含量的增加而大幅下降。镍钛芯不仅具备普通镍芯良好的多孔形成能力和制备工艺简易等优点,同时具备良好的导热系数可调节性,进而为复合结构毛细芯的研制提供了参考。
The high porosity nickel-titanium capillary wick with double pore size distribution was successfully prepared by a combination of powder metallurgy and pore-forming technology. The effects of NaCl concentration and titanium content on the microstructure and capillary aspiration of capillary wick were studied. The heat transfer mechanism in porous cores was analyzed and a new method to reduce the thermal conductivity of metal capillary wicks was proposed without any negative impact. The results show that increasing the amount of NaCl can improve the suction performance of NiTi core, while the increase of Ti content has little effect on it. When the amount of NaCl is the same, the solid solubility of nickel-titanium core increases with the increase of titanium content, which leads to the thermal conductivity of nickel-titanium capillary core is significantly lower than that of pure nickel core and decreases sharply with the increase of titanium content . Nickel-titanium core not only possesses the advantages of good porous formation ability and simple preparation process of common nickel core, but also has good thermal conductivity adjustability, which provides a reference for the development of composite capillary core.