Method for preparing ultrahigh-strength titanium alloy porous material based on additive manufacturing technology

Abstract

The invention relates to the field of porous material preparation, in particular to a method for preparing an ultrahigh-strength titanium alloy porous material based on an additive manufacturing technology. According to the method, the uniform porous titanium alloy material with the unit cell size and hole pattern being adjustable is prepared through a selective laser melting forming technology, and a uniform porous titanium alloy block material with the effective density being 0.5-2.0 g / cm < 3 >, the strength capable of reaching 600 MPa, the absorbed energy reaching 90 MJ / m < 3 > and the elastic modulus being 0.1-20 GPa can be obtained by optimizing additive manufacturing process parameters and selecting proper heat treatment. The method is simple in preparation process, low in cost and suitable for industrial production, and has a good application prospect in the fields of aerospace lightweight design, medical treatment, energy absorption and shock absorption, filtration and the like.

Description

Technical field:

[0001] The invention relates to the field of preparation of porous materials, in particular to a method for preparing ultra-high-strength titanium alloy porous materials based on additive manufacturing technology. Background technique:

[0002] Porous material is a dual-property engineering material with both structure and function. Compared with dense bodies, it also has many excellent properties, especially high specific strength, light weight, good energy absorption, large specific surface area, sound absorption and permeability. Strong, etc., are widely used in aerospace lightweight design, medical, energy absorption and shock absorption and filtration and other fields.

[0003] In the medical field, because porous titanium has a lower elastic modulus than its dense bulk material, it can match the bone modulus of the human body, which can effectively avoid the "stress shielding" effect; the large number of pores in porous titanium is more It is benefici...

Examples

Embodiment 1

[0044] With Ti-5.25Al-5.1Mo-5.3V-2.5Cr-1Fe alloy powder ( figure 1 , the powder diameter is 15 μm-53 μm) as the raw material, and the total amount of impurity content O+N+H is adjusted to be 0.3-0.45wt%. The porous mesh unit designed by CAD software is shown in figure 2 . Adjust the tensile, compressive or bending components acting on the hole wall when the force is applied, so that the proportions of the buckling components are 100%, and the following is obtained: figure 2 For the grid cells shown, the pore wall thickness is 500 μm. The porous titanium alloy bulk material was prepared by Realizer SLM100 selective laser melting equipment, the laser source power was 200W, the scanning distance was 200μm, the layer thickness was 50μm, and the scanning rate was 1200mm / s. Such as image 3 As shown, the porosity of the prepared titanium alloy porous material is 78%, the average pore diameter is 800 μm, the pore wall thickness is 0.5mm, and the density is 1.43g / cm 3 . The eq...

Embodiment 2

[0047] For the Ti-5.1Al-5.5Mo-4.9V-3.5Cr-0.95Fe alloy, the total amount of impurity content O+N+H is adjusted to be 0.4-0.5 wt%. The porous mesh unit designed by CAD software is shown in Figure 5 . Adjust the tensile, compressive or bending components acting on the hole wall when the force is applied, so that the proportions of the buckling components are 85% respectively, and the following is obtained: Figure 5 For the grid cells shown, the hole wall thickness is 0.6mm. The porous titanium alloy bulk material was prepared by Realizer SLM100 selective laser melting equipment, the laser source power was 200W, the scanning distance was 200μm, the layer thickness was 50μm, and the scanning rate was 1200mm / s. Such as Image 6 As shown, the porosity of the prepared titanium alloy porous material is 68%, the average pore diameter is 500 μm, the pore wall thickness is 0.5mm, and the density is 1.63g / cm 3 . The equipment used for the two-step heat treatment is a vacuum heat tre...

Embodiment 3

[0050] For the Ti-24Nb-1Fe-6Sn-3Zr alloy, the total amount of impurity content O+N+H is adjusted to 0.35-0.50wt%. The porous mesh unit designed by CAD software is shown in Figure 8 . Adjust the tensile, compressive or bending components of the force acting on the hole wall so that the proportions of the buckling components are 75%, and the following is obtained: Figure 8 For the grid cells shown, the hole wall thickness is 0.6 mm. The porous titanium alloy bulk material was prepared by Realizer SLM100 selective laser melting equipment, the laser source power was 200W, the scanning distance was 200μm, the layer thickness was 50μm, and the scanning rate was 1200mm / s. Such as Figure 9 As shown, the porosity of the prepared titanium alloy porous material is 72%, the average pore diameter is 600 μm, the pore wall thickness is 0.5mm, and the density is 1.58g / cm 3 . The equipment used for the two-step heat treatment is a vacuum heat treatment furnace. Insulate at 760-780°C f...

Technical field:

[0001] The invention relates to the field of preparation of porous materials, in particular to a method for preparing ultra-high-strength titanium alloy porous materials based on additive manufacturing technology. Background technique:

[0002] Porous material is a dual-property engineering material with both structure and function. Compared with dense bodies, it also has many excellent properties, especially high specific strength, light weight, good energy absorption, large specific surface area, sound absorption and permeability. Strong, etc., are widely used in aerospace lightweight design, medical, energy absorption and shock absorption and filtration and other fields.

[0003] In the medical field, because porous titanium has a lower elastic modulus than its dense bulk material, it can match the bone modulus of the human body, which can effectively avoid the "stress shielding" effect; the large number of pores in porous titanium is more It is benefici...

Examples

Embodiment 1

[0044] With Ti-5.25Al-5.1Mo-5.3V-2.5Cr-1Fe alloy powder ( figure 1 , the powder diameter is 15 μm-53 μm) as the raw material, and the total amount of impurity content O+N+H is adjusted to be 0.3-0.45wt%. The porous mesh unit designed by CAD software is shown in figure 2 . Adjust the tensile, compressive or bending components acting on the hole wall when the force is applied, so that the proportions of the buckling components are 100%, and the following is obtained: figure 2 For the grid cells shown, the pore wall thickness is 500 μm. The porous titanium alloy bulk material was prepared by Realizer SLM100 selective laser melting equipment, the laser source power was 200W, the scanning distance was 200μm, the layer thickness was 50μm, and the scanning rate was 1200mm / s. Such as image 3 As shown, the porosity of the prepared titanium alloy porous material is 78%, the average pore diameter is 800 μm, the pore wall thickness is 0.5mm, and the density is 1.43g / cm 3 . The eq...

Embodiment 2

[0047] For the Ti-5.1Al-5.5Mo-4.9V-3.5Cr-0.95Fe alloy, the total amount of impurity content O+N+H is adjusted to be 0.4-0.5 wt%. The porous mesh unit designed by CAD software is shown in Figure 5 . Adjust the tensile, compressive or bending components acting on the hole wall when the force is applied, so that the proportions of the buckling components are 85% respectively, and the following is obtained: Figure 5 For the grid cells shown, the hole wall thickness is 0.6mm. The porous titanium alloy bulk material was prepared by Realizer SLM100 selective laser melting equipment, the laser source power was 200W, the scanning distance was 200μm, the layer thickness was 50μm, and the scanning rate was 1200mm / s. Such as Image 6 As shown, the porosity of the prepared titanium alloy porous material is 68%, the average pore diameter is 500 μm, the pore wall thickness is 0.5mm, and the density is 1.63g / cm 3 . The equipment used for the two-step heat treatment is a vacuum heat tre...

Embodiment 3

[0050] For the Ti-24Nb-1Fe-6Sn-3Zr alloy, the total amount of impurity content O+N+H is adjusted to 0.35-0.50wt%. The porous mesh unit designed by CAD software is shown in Figure 8 . Adjust the tensile, compressive or bending components of the force acting on the hole wall so that the proportions of the buckling components are 75%, and the following is obtained: Figure 8 For the grid cells shown, the hole wall thickness is 0.6 mm. The porous titanium alloy bulk material was prepared by Realizer SLM100 selective laser melting equipment, the laser source power was 200W, the scanning distance was 200μm, the layer thickness was 50μm, and the scanning rate was 1200mm / s. Such as Figure 9 As shown, the porosity of the prepared titanium alloy porous material is 72%, the average pore diameter is 600 μm, the pore wall thickness is 0.5mm, and the density is 1.58g / cm 3 . The equipment used for the two-step heat treatment is a vacuum heat treatment furnace. Insulate at 760-780°C f...

Images