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CN-117070789-B - Titanium alloy tissue regulation and control method and application thereof in field of medical implant

CN117070789BCN 117070789 BCN117070789 BCN 117070789BCN-117070789-B

Abstract

The invention relates to the technical field of additive manufacturing, and provides a titanium alloy tissue regulation and control method and application thereof in the field of medical implants. Respectively selecting pure Mo particles with the average particle size of 10 microns, pure Mo particles with the average particle size of 30 microns and Ti6Al4V alloy powder with the particle size range of 15-53 microns as raw materials, uniformly mixing the powder in S1 with different masses for at least 5 hours, preparing compact Ti6Al4V alloy by optimizing technological parameters, preparing Ti6Al4V alloy with alpha+beta double-phase structures with different beta-phase contents, and regulating and controlling the beta-phase content in a formed sample by changing the integral content of the Mo powder. The method has the beneficial effects that Mo powder is added to regulate and control the phase composition of the Ti6Al4V alloy melted by the laser powder bed, so that the transition of the Ti6Al4V alloy melted by the laser powder bed from the complete alpha phase to the complete beta phase can be realized.

Inventors

  • WANG XIEBIN
  • WANG LIANLEI
  • LIU XINYU
  • CHANG HAODONG
  • WANG GUILONG

Assignees

  • 山东大学

Dates

Publication Date
20260505
Application Date
20230818

Claims (3)

  1. 1. The titanium alloy structure regulating and controlling method is characterized by comprising the following steps: s1, respectively selecting pure Mo particles with the average particle size of 10 microns, pure Mo particles with the average particle size of 30 microns and Ti6Al4V alloy powder with the particle size range of 15-53 microns as raw materials; s2, uniformly mixing the powder in S1 with different quality for at least 5 hours; Mechanically mixing 97% of Ti6Al4V alloy powder, 2.7% of fine Mo powder and 0.3% of coarse Mo powder by a mechanical mixing method, wherein the ratio of the fine Mo powder to the coarse Mo powder is 9:1, and the mixing time is 8 hours, so as to obtain mixed powder for L-PBF; The Mo powder contains coarse powder and fine powder, even if the overall Mo content is low, the alpha+beta double-phase structure can be obtained, and the beta content can be regulated and controlled; S3, preparing compact Ti6Al4V alloy by changing laser power, laser scanning speed and laser scanning interval; S3, forming the mixed powder in the step S2 by adopting a laser powder bed fusion L-PBF process, wherein the laser power is 160W, the laser scanning speed is 1100mm/S, the scanning interval is 80 mu m, and the powder spreading layer thickness is 30 mu m; S4, preparing a Ti6Al4V alloy with alpha+beta double-phase structures with different beta-phase contents, and regulating and controlling the beta-phase content in a formed sample by changing the overall content of Mo powder; in S4, when the ratio of coarse powder to fine powder in the Mo powder to be added is unchanged, the β -phase content in the molded sample is increased by increasing the overall Mo content.
  2. 2. The method for controlling a titanium alloy structure according to claim 1, wherein in S3, the laser power is varied in a range of 50 to 500w, the laser scanning speed is 100 to 5000mm/S, and the laser scanning pitch is 10 to 150 μm.
  3. 3. A medical implant made using the titanium alloy tissue manipulation method of any one of claims 1-2.

Description

Titanium alloy tissue regulation and control method and application thereof in field of medical implant Technical Field The invention relates to the technical field of additive manufacturing, in particular to a titanium alloy tissue regulation and control method and application thereof in the field of medical implants. Background The laser powder bed melting process, the material undergoes a rapid melting and cooling process with a cooling rate as high as 10 5～107 ℃ per second. The extremely rapid cooling rate causes the Ti6Al4V alloy to generate martensitic transformation in the cooling process, and a complete alpha phase structure (instead of an alpha+beta double-phase structure) is formed at room temperature, so that the laser powder bed fused Ti6Al4V alloy has high strength generally but poor plasticity. Subsequent heat treatment is a common method for regulating and controlling the microstructure of the additive manufacturing Ti6Al4V alloy. Heating to above alpha-beta temperature, converting the material into beta phase, and slowly cooling to obtain alpha+beta dual-phase structure. And adding 4.5% of 316L stainless steel powder into the Ti6Al4V alloy powder, and obtaining the alpha+beta double-phase structure through local component regulation. The main drawbacks of the above preparation method are as follows: (1) The heat treatment has the defects that the titanium alloy is relatively active, is easily oxidized in the heat treatment process, generally needs to be carried out in a vacuum furnace, has higher equipment requirement, has complex operation flow and low efficiency, and is not suitable for large-scale components. (2) The disadvantage of adding 316 stainless steel is that, because the stainless steel contains Fe, co, ni, mo and other elements, these elements can react with alloy elements in Ti6Al4V to generate intermetallic compounds in the melting process of the laser powder bed. When the intermetallic compound content is too high, cracking of the printed specimen may be caused, seriously deteriorating the material properties. The 316 stainless steel content added by this method cannot be too high (within 5%). The above limitations result in the difficulty of controlling the beta phase content of the as-printed alloy using this method. In view of this, the present invention has been proposed. Disclosure of Invention The invention aims to provide a titanium alloy tissue regulation and control method and application thereof in the field of medical implants, so as to solve the technical problems in the prior art. In order to achieve the aim, the technical scheme adopted by the invention is that the titanium alloy structure regulating and controlling method comprises the following steps: s1, respectively selecting pure Mo particles with the average particle size of 10 microns, pure Mo particles with the average particle size of 30 microns and Ti6Al4V alloy powder with the particle size range of 15-53 microns as raw materials; s2, uniformly mixing the powder in S1 with different quality for at least 5 hours; S3, preparing compact Ti6Al4V alloy by changing laser power, laser scanning speed and laser scanning interval; s4, preparing the Ti6Al4V alloy with the alpha+beta double-phase structure with different beta phase contents, and regulating and controlling the beta phase content in the formed sample by changing the overall content of Mo powder. In an alternative embodiment, in S4, when the ratio of coarse powder to fine powder in the Mo powder added is unchanged, the β -phase content in the formed sample is raised by increasing the overall content of Mo. In an alternative embodiment, the laser power variation range is 50-500W, the laser scanning speed is 100-5000 mm/s, and the laser scanning interval is 10-150 μm. In an alternative embodiment, in S2, a mechanical mixing method is adopted to mechanically mix 97% of Ti6Al4V alloy powder, 2.7% of fine Mo powder and 0.3% of coarse Mo powder, wherein the ratio of the fine Mo powder to the coarse Mo powder is 9:1, and the mixing time is 8 hours, so as to obtain the mixed powder for the L-PBF. In an alternative embodiment, in S2, a mechanical mixing method is adopted to mechanically mix 95% of Ti6Al4V alloy powder, 4.5% of fine Mo powder and 0.5% of coarse Mo powder, wherein the ratio of the fine Mo powder to the coarse Mo powder is 9:1, and the mixing time is 12 hours, so as to obtain the mixed powder for the L-PBF. In an alternative embodiment, in S2, mechanically mixing 93% of Ti6Al4V alloy powder, 6.3% of fine Mo powder and 0.7% of coarse Mo powder by mass by adopting a mechanical mixing method, wherein the ratio of the fine Mo powder to the coarse Mo powder is 9:1, and the mixing time is 12 hours, so as to obtain the mixed powder for the L-PBF. In an alternative embodiment, in S2, a mechanical mixing method is adopted to mechanically mix 90% of Ti6Al4V alloy powder, 9% of fine Mo powder and 1% of coarse Mo powder, wherein the ratio of the fine Mo po