Metal lattice structure skeleton material and its preparation method and application

Abstract

The present invention discloses a metal lattice structure skeleton material, its preparation method, and application. The metal lattice structure skeleton material utilizes a Gyroid-type TPMS curved surface lattice structure with gradient wall thickness. The thickness H2 corresponding to the nodes of the Gyroid-type TPMS curved surface lattice structure with gradient wall thickness is greater than the thickness H1 corresponding to the middle section of the curved surface. The metal lattice structure skeleton material described in this application utilizes a Gyroid-type three-periodic minimal surface (TPMS) lattice structure with a gradient wall thickness. Through the coordinated design of node reinforcement and surface tapering, this material achieves a lightweight design while maintaining the inherent high specific strength characteristics of the TPMS curved surface. This increases porosity and metal matrix material penetration, thereby enhancing the strength of the metal-matrix composite material.

Claims

1. A metal lattice structure skeleton material, characterized in that: The metal lattice structure skeleton material adopts a Gyroid-type TPMS curved surface lattice structure based on gradient wall thickness, wherein the thickness H2 corresponding to the node of the Gyroid-type TPMS curved surface lattice structure based on gradient wall thickness is greater than the thickness H1 corresponding to the middle section of the curved surface; The unit size of the Gyroid-type TPMS curved surface lattice structure based on gradient wall thickness is 1mm-2mm; And / or, the wall thickness of the Gyroid-type TPMS curved lattice structure based on gradient wall thickness is 0.2 mm to 0.5 mm; And / or, the ratio of the wall thickness to the unit size of the Gyroid-type TPMS curved lattice structure based on gradient wall thickness is 1:(5-10); And / or, the pore size of the Gyroid-type TPMS curved lattice structure based on gradient wall thickness is 100 μm-500 μm; And / or, the porosity of the Gyroid-type TPMS curved surface lattice structure based on gradient wall thickness is 40%-90%; The local curvature radius R(z) of the curved surface in the Gyroid-type TPMS curved surface lattice structure based on gradient wall thickness and the wall thickness t(z) satisfy t(z)=t min + , where △t=H2-H1, λ is the curvature attenuation coefficient 0.45mm<λ<0.55mm, t min = H1, t max =H2, z is the spatial height coordinate; And / or, the aperture D(z) and the wall thickness t(z) in the Gyroid-type TPMS curved lattice structure based on gradient wall thickness satisfy , where D max is the hole diameter corresponding to the wall thickness H1, D min is the hole diameter corresponding to the wall thickness H2, t min = H1, t max =H2, z is the spatial height coordinate; And / or, the expression of the implicit function f(x, y, z) of the Gyroid - type TPMS surface lattice structure based on gradient wall thickness is: sin(2πx / L)cos(2πy / L)+sin(2πy / L)cos(2πz / L)+sin(2πz / L)cos(2πx / L)=C(z), where: f(x, y, z)≥C(z) corresponds to the solid part of the metal lattice structure skeleton material, and f(x, y, z)<C(z) corresponds to the pore part of the metal lattice structure skeleton material; L is the lattice unit size, C(z)=Co + k·z, C(z) is the gradient adjustment function along the Z - axis, Co is the reference offset constant, - 0.3<Co<1.2; k is the gradient coefficient 0.02mm -1 <k<0.1mm -1 , x, y, z are three - dimensional space rectangular coordinates.

2. The metal lattice structure skeleton material according to claim 1, characterized in that: △t=H2-H1 is 0.05mm-0.15mm; And / or, the material of the metal lattice structure skeleton material is selected from titanium alloy.

3. A method for preparing the metal lattice structure skeleton material according to claim 1 or 2, characterized in that: It includes printing the metal lattice structure skeleton material by 3D printing.

4. The method for preparing the metal lattice structure skeleton material according to claim 3, characterized in that: The parameters of the 3D printing process satisfy at least one of the following characteristics: Feature 1, laser power 100W-230W; Feature 2, scanning speed 1000mm / s-1500mm / s; Feature 3, layer thickness 30μm-60μm; Feature 4: The shielding gas is argon.

5. A TPMS lattice reinforced metal matrix composite material, characterized in that: include: The metal lattice structure skeleton material according to claim 1 or 2 and a metal matrix filled in the pore structure of the metal lattice structure skeleton material.

6. The TPMS lattice reinforced metal matrix composite material according to claim 5, characterized in that: The material of the metal matrix is ​​selected from aluminum alloy; And / or, the interfacial shear strength of the TPMS lattice reinforced metal matrix composite material is ≥200 MPa; And / or, the porosity of the TPMS lattice reinforced metal matrix composite material is less than 0.5%.

7. A method for preparing the TPMS lattice reinforced metal matrix composite material according to claim 5 or 6, characterized in that: The method comprises filling a metal matrix into the metal lattice structure skeleton material.

8. The method for preparing the TPMS lattice reinforced metal matrix composite material according to claim 7, characterized in that: The filler metal matrix is ​​formed by die casting, and the die casting step satisfies at least one of the following characteristics ac: Feature a, die casting temperature is 650℃-690℃; Feature b, die casting pressure ≥ 100MPa; Feature c, the injection speed of the molten metal is 0.3m / s-0.6m / s.

Images