Method for preparing high fatigue property porous Ti-6Al-4V bulk material

Abstract

The invention relates to porous material preparation, in particular relates to a method for preparing a high fatigue property porous Ti-6Al-4V bulk material, which is used for solving the problem of low fatigue property of the porous Ti-6Al-4V bulk material of the prior art. The method is that an 'electron beam molten metal molding technology' is utilized to prepare the large Ti-6Al-4V bulk material with the porosity of 50%-95% at first, the porous material is then subjected to two steps of thermal treatment of annealing and aging at 400 DEG C and 1000 DEG C, and the Ti-6Al-4V porous material with high fatigue strength, low elasticity modulus of (0.1-20 GPa) and 'the ratio of fatigue strength / compressive strength' of 0.7 is obtained finally. According to the method, the mechanical performance of the porous Ti-6Al-4V pore wall material is controlled through a thermal treatment technology, and thus, a large titanium alloy porous material with excellent fatigue property is obtained and can be widely applied to the fields of aerospace, medical treatment and the like.

Description

Technical field:

[0001] The invention relates to the field of porous material preparation, in particular to a method for preparing porous Ti-6Al-4V bulk material with high fatigue performance. Background technique:

[0002] Porous titanium and titanium alloy materials are widely used in medical, aerospace and other fields due to their advantages such as small specific gravity, good energy absorption, large specific surface area, good sound absorption, and strong permeability. In the medical field, porous titanium and titanium alloys have a lower elastic modulus than their dense bulk materials, which can match the bone modulus of the human body, and can effectively avoid the "stress shielding" effect; A large number of pores are more conducive to the ingrowth of surrounding cells and the growth of new bone, the delivery of therapeutic drugs, the exchange of nutrients, etc., thereby promoting the reconstruction of the implant and the natural bone tissue of the human body, as w...

Examples

Embodiment 1

[0041] Use CAD software to design a grid whose unit body is a cube (Fig. 1(a), the grid side length is 2mm). With Ti-6Al-4V alloy powder ( figure 2 , powder diameter is 50-80μm) as raw material, using Arcam A1 electron beam melting equipment to prepare porous Ti-6Al-4V bulk material, electron beam scanning speed is 150mm / s, electron beam current is 1.5mA. The prepared Ti-6Al-4V porous material has a porosity of 77%, a pore size of 500 μm, and a density of 1.0 g / cm 3 ( image 3 ).

[0042] In this example, the prepared Ti-6Al-4V porous material is subjected to two-step heat treatment in the two-phase region:

[0043] (1) Two-phase zone annealing treatment Using a vacuum heat treatment furnace, the prepared porous material was heat treated at 800 °C for 1 h, and cooled to room temperature at a rate of 1 °C / min.

[0044] (2) The aging treatment in the two-phase zone uses a vacuum heat treatment furnace at a heat treatment temperature of 500°C for 3 hours, and cools to room te...

Embodiment 2

[0047] Use CAD software to design a grid whose unit body is a rhombic dodecahedron (Fig. 1(b), the grid side length is 2 mm). Using Ti-6Al-4V alloy powder as raw material ( figure 2 , the powder diameter is 50-80 μm), and the porous Ti-6Al-4V bulk material is prepared by ArcamA1 electron beam melting equipment, the electron beam scanning speed is 300m / s, and the electron beam current is 2mA. The prepared Ti-6Al-4V porous material has a porosity of 72%, a pore size of 400 μm, and a density of 1.2 g / cm 3 ( Figure 5 ).

[0048] In this example, the prepared Ti-6Al-4V porous material is subjected to two-step heat treatment in the two-phase region:

[0049] (1) Two-phase zone annealing treatment Using a vacuum heat treatment furnace, the prepared porous material was heat-treated at 900°C for 1.5h, and cooled to room temperature at a rate of 2°C / min.

[0050] (2) The aging treatment in the two-phase zone uses a vacuum heat treatment furnace at a heat treatment temperature of 60...

Embodiment 3

[0053] Use CAD software to design a grid whose unit body is a cube (Fig. 1(a), the grid side length is 2 mm). Using Ti-6Al-4V alloy powder as raw material ( figure 2 , powder diameter is 50-80μm), using Arcam A1 electron beam melting equipment to prepare porous Ti-6Al-4V bulk material, the electron beam scanning speed is 250mm / s, and the electron beam current is 3mA. The prepared Ti-6Al-4V alloy has a porosity of 80%, a pore size of 500 μm, and a density of 0.8 g / cm 3 .

[0054] In this example, the prepared Ti-6Al-4V porous material is subjected to two-step heat treatment in the two-phase region:

[0055] (1) Two-phase zone annealing treatment Using a vacuum heat treatment furnace, heat-treat the prepared porous material at 700°C for 3h, and cool it to room temperature at a rate of 1°C / min.

[0056] (2) The aging treatment in the two-phase zone uses a vacuum heat treatment furnace at a heat treatment temperature of 650°C for 3 hours, and cools to room temperature at a rate...

Technical field:

[0001] The invention relates to the field of porous material preparation, in particular to a method for preparing porous Ti-6Al-4V bulk material with high fatigue performance. Background technique:

[0002] Porous titanium and titanium alloy materials are widely used in medical, aerospace and other fields due to their advantages such as small specific gravity, good energy absorption, large specific surface area, good sound absorption, and strong permeability. In the medical field, porous titanium and titanium alloys have a lower elastic modulus than their dense bulk materials, which can match the bone modulus of the human body, and can effectively avoid the "stress shielding" effect; A large number of pores are more conducive to the ingrowth of surrounding cells and the growth of new bone, the delivery of therapeutic drugs, the exchange of nutrients, etc., thereby promoting the reconstruction of the implant and the natural bone tissue of the human body, as w...

Examples

Embodiment 1

[0041] Use CAD software to design a grid whose unit body is a cube (Fig. 1(a), the grid side length is 2mm). With Ti-6Al-4V alloy powder ( figure 2 , powder diameter is 50-80μm) as raw material, using Arcam A1 electron beam melting equipment to prepare porous Ti-6Al-4V bulk material, electron beam scanning speed is 150mm / s, electron beam current is 1.5mA. The prepared Ti-6Al-4V porous material has a porosity of 77%, a pore size of 500 μm, and a density of 1.0 g / cm 3 ( image 3 ).

[0042] In this example, the prepared Ti-6Al-4V porous material is subjected to two-step heat treatment in the two-phase region:

[0043] (1) Two-phase zone annealing treatment Using a vacuum heat treatment furnace, the prepared porous material was heat treated at 800 °C for 1 h, and cooled to room temperature at a rate of 1 °C / min.

[0044] (2) The aging treatment in the two-phase zone uses a vacuum heat treatment furnace at a heat treatment temperature of 500°C for 3 hours, and cools to room te...

Embodiment 2

[0047] Use CAD software to design a grid whose unit body is a rhombic dodecahedron (Fig. 1(b), the grid side length is 2 mm). Using Ti-6Al-4V alloy powder as raw material ( figure 2 , the powder diameter is 50-80 μm), and the porous Ti-6Al-4V bulk material is prepared by ArcamA1 electron beam melting equipment, the electron beam scanning speed is 300m / s, and the electron beam current is 2mA. The prepared Ti-6Al-4V porous material has a porosity of 72%, a pore size of 400 μm, and a density of 1.2 g / cm 3 ( Figure 5 ).

[0048] In this example, the prepared Ti-6Al-4V porous material is subjected to two-step heat treatment in the two-phase region:

[0049] (1) Two-phase zone annealing treatment Using a vacuum heat treatment furnace, the prepared porous material was heat-treated at 900°C for 1.5h, and cooled to room temperature at a rate of 2°C / min.

[0050] (2) The aging treatment in the two-phase zone uses a vacuum heat treatment furnace at a heat treatment temperature of 60...

Embodiment 3

[0053] Use CAD software to design a grid whose unit body is a cube (Fig. 1(a), the grid side length is 2 mm). Using Ti-6Al-4V alloy powder as raw material ( figure 2 , powder diameter is 50-80μm), using Arcam A1 electron beam melting equipment to prepare porous Ti-6Al-4V bulk material, the electron beam scanning speed is 250mm / s, and the electron beam current is 3mA. The prepared Ti-6Al-4V alloy has a porosity of 80%, a pore size of 500 μm, and a density of 0.8 g / cm 3 .

[0054] In this example, the prepared Ti-6Al-4V porous material is subjected to two-step heat treatment in the two-phase region:

[0055] (1) Two-phase zone annealing treatment Using a vacuum heat treatment furnace, heat-treat the prepared porous material at 700°C for 3h, and cool it to room temperature at a rate of 1°C / min.

[0056] (2) The aging treatment in the two-phase zone uses a vacuum heat treatment furnace at a heat treatment temperature of 650°C for 3 hours, and cools to room temperature at a rate...

Images