Intelligent temperature control lattice structure based on 4D printing and application thereof

An intelligent temperature control lattice structure based on 4D printing, wherein the lattice structure comprises a lattice metal and a liquid storage chamber, wherein the lattice metal is an integral closed structure formed by extending a unit cell with a tetrakaidecahedron shell and six holes in connection, a diagonal length of openings of the lattice metal is 0.5 mm-2 mm, and the liquid storage chamber is in connection with the lattice metal;

• wherein the lattice structure is manufactured by a selective laser melting additive manufacturing process with following specific steps:
• step 1, carrying out process adaptability design on pore structure for the lattice structure with three-dimensional design software, and establishing a three-dimensional model of the lattice structure;
• step 2, slicing the three-dimensional model of the lattice structure established in step 1 with slicing software, and manufacturing the lattice structure using a selective laser melting additive manufacturing process characterized by a high volumetric energy density, a low laser power and a low scanning speed, wherein the high volumetric energy density is 250 J/mm3~400 J/mm3, the low laser power is 60 W~100 W, and the low scanning speed is 80~200 mm/s;
• the matrix material of the intelligent temperature control lattice structure is nickel-titanium shape memory alloy powder, and a mass fraction of nickel in the nickel-titanium shape memory alloy is 55.08%~56.10%, and a particle size of the alloy powder is 15 m~53 μm;
• step 3, carrying out solution treatment on the lattice structure obtained in step 2, wherein a temperature for the solution treatment is 800° C.~1100° C., and a duration for the solution treatment is 1 h~15 h;
• step 4, injecting cooling liquid into the liquid storage chamber and then closing the openings in the lattice metal by cold pressing under a normal temperature condition;
• when an ambient temperature excitation of the intelligent temperature control lattice structure reaches a preset response temperature of 15° C.~80° C., the openings of the lattice metal automatically open, and the cooling liquid in the liquid storage chamber is ejected from the openings of the lattice metal to realize a temperature control function.