Alkali metal heat pipe wick and preparation method thereof and heat pipe

The invention discloses an alkali metal heat pipe wick and a preparation method thereof and a heat pipe. The alkali metal heat pipe wick comprises foam metal, and alkali metal needle-shaped nanoparticles are formed on the surface of the foam metal. The preparation method comprises the following steps of: immersing foam metal into a mixed solution containing alkali metal ions, and then taking out the foam metal for high-temperature baking. A micro-nano composite capillary structure is formed by redox reaction and a method of compounding needle-shaped nanoparticles on the surface of foam metal, the micropore diameter is further reduced, meanwhile, the wettability of a working medium in the micropores of the capillary structure is improved, the contact angle is reduced, and the capillary limit is improved. 本发明公开了碱金属热管吸液芯及其制备方法和热管，碱金属热管吸液芯包括泡沫金属，所述泡沫金属的表面形成有碱金属针状纳米微粒，制备方法：将泡沫金属浸入含有碱金属离子的混合溶液中，然后取出泡沫金属进行高温烘烤。本发明利用氧化还原反应，采用泡沫金属表面复合针状纳米微粒的方法来形成微纳复合毛细结构，进一步减小微孔孔径，同时提升工质与毛细结构微孔的浸润性，减小接触角，有助于提高毛细极限。