High-fluidity titanium alloy powder and preparation method thereof

Abstract

The present invention relates to the technical field of alloy powder preparation, and particularly to a high-fluidity titanium alloy powder and a preparation method thereof. The preparation method of the present invention comprises the following steps: after introducing a protective gas, feeding a titanium alloy wire into a plasma generator for vaporization and smelting, and then sieving to obtain a titanium alloy powder; adding a synergist and a flow aid and stirring evenly to finally obtain the high-fluidity titanium alloy powder; the addition of the flow aid can generate a stable nano-scale passivation film on the surface of the titanium alloy powder, thereby improving the fluidity of the titanium alloy powder and reducing the possibility of the titanium alloy powder adsorbing interstitial elements such as oxygen and nitrogen in the environment, thereby increasing the purity; the synergist can react with the passivation film when the high-fluidity titanium alloy powder is subjected to high-temperature treatment, thereby improving the plasticity of the high-fluidity titanium alloy powder and the fracture toughness of the prepared device, so that the titanium alloy powder of the present invention has higher stability, fluidity and application prospects.

Description

Technical Field

[0001] The present invention relates to the technical field of alloy powder preparation, and in particular to high-fluidity titanium alloy powder and a preparation method thereof. Background Art

[0002] Titanium and titanium alloys are very suitable materials for aviation and aerospace because their specific gravity is only about 4.5, which is almost 1 / 2 of the commonly used steel alloys with a specific gravity of more than 7.8. Furthermore, titanium and titanium alloys are strong, and their strength to weight ratio far exceeds that of lightweight aluminum and aluminum alloys, especially in terms of temperature resistance and acid and alkali resistance. However, low-oxygen titanium powder requires strict control of the powder during preparation and storage, so that the low-oxygen titanium powder is always in an inert gas or vacuum atmosphere to avoid powder passivation. This greatly increases the cost of using and storing low-oxygen titanium powder. At the same time, the powder produced by this method has a high surface activity and will passivate rapidly after exposure to air, forming a dense passivation film, and adsorbing a large amount of gas impurities, which deteriorates the powder performance and spherical powder fluidity.

[0003] At the same time, titanium alloy is a highly active alloy. To obtain high-purity titanium alloy powder with low impurity content, it is necessary to ensure that the environment is always in a high-purity inert gas protection or high vacuum environment during the preparation process to avoid contamination of the titanium alloy. The titanium alloy powder produced by atomization has a high surface activity, especially when the prepared powder has a particle size of less than 100 microns. The powder is fluffy and agglomerated, and has poor fluidity, which makes subsequent screening of the powder very difficult. On the other hand, fine titanium alloy powder is highly active. When it is quickly exposed to air, the surface oxidizes rapidly and releases a large amount of heat, which poses a great safety hazard.

[0004] Therefore, in the preparation process of titanium alloy powder, it is particularly important to passivate the surface of the titanium alloy powder without affecting the chemical composition of the titanium alloy powder itself, so as to reduce the surface tension, reduce surface impurities, and increase stability and fluidity.

[0005] Therefore, according to the above-mentioned related technologies, it is urgent to develop a high-fluidity titanium alloy powder and a preparation method thereof. Summary of the Invention

[0006] In view of this, the purpose of the present invention is to provide a high-fluidity titanium alloy powder and a preparation method thereof, so as to solve the problem of poor stability and fluidity of the titanium alloy powder prepared in the prior art.

[0007] Based on the above objectives, the present invention provides a high-fluidity titanium alloy powder and a preparation method thereof.

[0008] A method for preparing high-fluidity titanium alloy powder comprises the following steps:

[0009] Step S1: After introducing a protective gas, the titanium alloy wire is fed into a plasma generator for vaporization and melting to form a fine spherical titanium alloy powder, which is then sieved under the protective atmosphere to obtain a titanium alloy powder;

[0010] Step S2: spraying a flow aid onto the surface of the titanium alloy powder, stirring evenly, and then spraying a synergist and stirring evenly to obtain a high-flowability titanium alloy powder;

[0011] The particle size of the synergist is 21-30 μm;

[0012] The synergist is prepared from PdCl3 and PtCl2;

[0013] The particle size of the flow aid is 21-30 μm;

[0014] The flow aid is any one of metal chloride and halogenated hydrocarbon organic compound.

[0015] Preferably, the protective gas flow rate in step S1 is 1-6 slpm;

[0016] The titanium alloy wire feeding rate in step S1 is 10-600 g / min;

[0017] The power of the plasma generator in step S1 is 15-200KW, the pressure is 103.4-130.9KPa, the central gas flow rate is 8-100slpm, the auxiliary gas flow rate is 25-100slpm, the argon flow rate is 30-300slpm, and the hydrogen flow rate is 2-80slpm.

[0018] Preferably, the diameter of the titanium alloy wire is 0.1-10 mm.

[0019] Preferably, the titanium alloy wire in step S1 is any one of α-type titanium alloy, α+β-type titanium alloy, and TiAl-type titanium alloy.

[0020] Preferably, the central gas in step S1 is argon;

[0021] The auxiliary gas in step S1 is argon;

[0022] The protective gas in step S1 is argon.

[0023] Preferably, the particle size of the titanium alloy powder in step S1 is 21-30 μm;

[0024] The thickness of the passivation layer on the surface of the high-fluidity titanium alloy powder in step S1 is 1-7 nm.

[0025] Preferably, the metal chloride is any one of TiCl4 and SnCl4;

[0026] The halogenated hydrocarbon organic compound is any one of CHCl3, CH2Cl2, C2HCl3, C2Cl4, and CCl4.

[0027] Preferably, the preparation method of the synergist is as follows:

[0028] PdCl3 and PtCl2 are mixed evenly to obtain a synergist.

[0029] Preferably, the mass ratio of PdCl3 to PtCl2 is 0.005-0.01:0.005-0.02.

[0030] Preferably, the mass ratio of the flow aid, synergist, and titanium alloy powder in step S2 is 0.01-1:0.01-0.03:100.

[0031] Beneficial effects of the present invention:

[0032] The present invention provides a high-fluidity titanium alloy powder and a preparation method thereof. The preparation method of the present invention comprises the following steps: after introducing a protective gas, feeding a titanium alloy wire into a plasma generator for vaporization and smelting, and then sieving to obtain a titanium alloy powder; adding a synergist and a flow aid and stirring evenly to finally obtain a high-fluidity titanium alloy powder; the addition of the flow aid can generate a stable nano-scale passivation film on the surface of the titanium alloy powder, thereby improving the fluidity of the titanium alloy powder and reducing the possibility of the titanium alloy powder adsorbing interstitial elements such as oxygen and nitrogen in the environment, thereby increasing the purity; the synergist can react with the passivation film when the high-fluidity titanium alloy powder is subjected to high-temperature treatment, thereby improving the plasticity of the high-fluidity titanium alloy powder and the fracture toughness of the prepared device. Therefore, compared with the prior art, the titanium alloy powder prepared by the present invention has higher stability, fluidity and application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only for the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0034] Figure 1 This is a state diagram of the high-fluidity titanium alloy powder prepared in the preparation example of the invention;

[0035] Figure 2 This is a state diagram of the high-fluidity titanium alloy powder prepared in Comparative Example 10 of the present invention. DETAILED DESCRIPTION

[0036] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to specific embodiments.

[0037] Example 1: A method for preparing high-fluidity titanium alloy powder:

[0038] S1: introducing a central gas, argon gas, and hydrogen gas into the plasma generator, starting a high-frequency power supply and exciting the plasma, then introducing an auxiliary gas, and gradually adjusting the system pressure, power, and various gas flow rates to predetermined values; wherein the central gas and auxiliary gas are both argon; the predetermined power value of the plasma generator is 15 kW, the predetermined pressure value is 103.4 kPa, the predetermined central gas flow rate is 8 slpm, the predetermined auxiliary gas flow rate is 25 slpm, the predetermined argon flow rate is 30 slpm, and the predetermined hydrogen flow rate is 2 slpm;

[0039] S2: After introducing argon gas at a flow rate of 1 slpm, TA1 titanium alloy wire with a diameter of 0.1-10 mm was fed into a plasma generator at a rate of 10 g / min for vaporization and melting to form fine spherical titanium alloy powder. The powder was then sieved under a nitrogen atmosphere to obtain a titanium alloy powder with a particle size of 21-30 μm.

[0040] S3: 0.005 g of PdCl3 with a particle size of 21-30 μm and 0.005 g of PtCl2 with a particle size of 21-30 μm are mixed to obtain a synergist;

[0041] S4: Spraying 0.01 g of TiCl4 with a particle size of 21-30 μm onto the surface of 100 g of titanium alloy powder, stirring evenly, and then spraying 0.01 g of a synergist with a particle size of 21-30 μm and stirring evenly to obtain a high-flowability titanium alloy powder with a surface passivation layer thickness of 1-7 nm;

[0042] Example 2: A method for preparing high-fluidity titanium alloy powder:

[0043] S1: introducing a central gas, argon gas, and hydrogen gas into the plasma generator, starting a high-frequency power supply and exciting the plasma, then introducing an auxiliary gas, and gradually adjusting the system pressure, power, and various gas flow rates to predetermined values; wherein the central gas and the auxiliary gas are both argon; the predetermined power value of the plasma generator is 60 kW, the predetermined pressure value is 110.2 kPa, the predetermined central gas flow rate is 25 slpm, the predetermined auxiliary gas flow rate is 45 slpm, the predetermined argon flow rate is 75 slpm, and the predetermined hydrogen flow rate is 6 slpm;

[0044] S2: After introducing argon gas at a flow rate of 3 slpm, TA3 titanium alloy wire with a diameter of 0.1-10 mm was fed into a plasma generator at a rate of 100 g / min for vaporization and melting to form fine spherical titanium alloy powder. The powder was then sieved under a nitrogen atmosphere to obtain a titanium alloy powder with a particle size of 21-30 μm.

[0045] S3: 0.007 g of PdCl3 with a particle size of 21-30 μm and 0.01 g of PtCl2 with a particle size of 21-30 μm are mixed to obtain a synergist;

[0046] S4: Spray 0.03 g of SnCl4 with a particle size of 21-30 μm onto the surface of 100 g of titanium alloy powder, stir evenly, then spray 0.017 g of a synergist with a particle size of 21-30 μm and stir evenly to obtain a high-flowability titanium alloy powder with a surface passivation layer thickness of 1-7 nm;

[0047] Example 3: A method for preparing high-fluidity titanium alloy powder:

[0048] S1: introducing a central gas, argon gas, and hydrogen gas into the plasma generator, starting a high-frequency power supply and exciting the plasma, then introducing an auxiliary gas, and gradually adjusting the system pressure, power, and various gas flow rates to predetermined values; wherein the central gas and the auxiliary gas are both argon; the predetermined power value of the plasma generator is 60 kW, the predetermined pressure value is 110.2 kPa, the predetermined central gas flow rate is 25 slpm, the predetermined auxiliary gas flow rate is 45 slpm, the predetermined argon flow rate is 75 slpm, and the predetermined hydrogen flow rate is 6 slpm;

[0049] S2: After introducing argon gas at a flow rate of 4 slpm, TC4 titanium alloy wire with a diameter of 0.1-10 mm is fed into a plasma generator at a rate of 300 g / min for vaporization and melting to form fine spherical titanium alloy powder. The powder is then sieved under an argon atmosphere to obtain a titanium alloy powder with a particle size of 21-30 μm.

[0050] S3: 0.008 g of PdCl3 with a particle size of 21-30 μm and 0.015 g of PtCl2 with a particle size of 21-30 μm were mixed to obtain a synergist;

[0051] S4: Spray 0.6 g of CHCl3 with a particle size of 21-30 μm onto the surface of 100 g of titanium alloy powder, stir evenly, then spray 0.23 g of a synergist with a particle size of 21-30 μm and stir evenly to obtain a high-flowability titanium alloy powder with a surface passivation layer thickness of 1-7 nm;

[0052] Example 4: A method for preparing high-fluidity titanium alloy powder:

[0053] S1: introducing a central gas, argon gas, and hydrogen gas into the plasma generator, starting a high-frequency power supply and exciting the plasma, then introducing an auxiliary gas, and gradually adjusting the system pressure, power, and various gas flow rates to predetermined values; wherein the central gas and auxiliary gas are both argon gas; the predetermined power value of the plasma generator is 200 kW, the predetermined pressure value is 130.9 kPa, the predetermined central gas flow rate is 100 slpm, the predetermined auxiliary gas flow rate is 100 slpm, the predetermined argon flow rate is 300 slpm, and the predetermined hydrogen flow rate is 80 slpm;

[0054] S2: After introducing argon gas at a flow rate of 6 slpm, TiAl type titanium alloy wire with a diameter of 0.1-10 mm is fed into a plasma generator at a rate of 600 g / min for vaporization and melting to form fine spherical titanium alloy powder. The powder is then sieved under an argon atmosphere to obtain a titanium alloy powder with a particle size of 21-30 μm.

[0055] S3: 0.01 g of PdCl3 with a particle size of 21-30 μm and 0.02 g of PtCl2 with a particle size of 21-30 μm are mixed to obtain a synergist;

[0056] S4: Spray 1 g of C2HCl3 with a particle size of 21-30 μm onto the surface of 100 g of titanium alloy powder, stir evenly, then spray 0.03 g of a synergist with a particle size of 21-30 μm and stir evenly to obtain a high-flowability titanium alloy powder with a surface passivation layer thickness of 1-7 nm;

[0057] Example 5: A method for preparing high-fluidity titanium alloy powder:

[0058] S1: introducing a central gas, argon gas, and hydrogen gas into the plasma generator, starting a high-frequency power supply and exciting the plasma, then introducing an auxiliary gas, and gradually adjusting the system pressure, power, and various gas flow rates to predetermined values; wherein the central gas and auxiliary gas are both argon gas; the predetermined power value of the plasma generator is 200 kW, the predetermined pressure value is 130.9 kPa, the predetermined central gas flow rate is 100 slpm, the predetermined auxiliary gas flow rate is 100 slpm, the predetermined argon flow rate is 300 slpm, and the predetermined hydrogen flow rate is 80 slpm;

[0059] S2: After introducing argon gas at a flow rate of 6 slpm, TC11 titanium alloy wire with a diameter of 0.1-10 mm is fed into a plasma generator at a rate of 10-600 g / min for vaporization and melting to form fine spherical titanium alloy powder. The powder is then sieved under an argon atmosphere to obtain a titanium alloy powder with a particle size of 21-30 μm.

[0060] S4: 0.01 g of PdCl3 with a particle size of 21-30 μm and 0.02 g of PtCl2 with a particle size of 21-30 μm are mixed to obtain a synergist;

[0061] S5: Spray 1 g of CCl4 with a particle size of 21-30 μm onto the surface of 100 g of titanium alloy powder, stir evenly, then spray 0.03 g of a synergist with a particle size of 21-30 μm and stir evenly to obtain a high-flowability titanium alloy powder with a surface passivation layer thickness of 1-7 nm;

[0062] Comparative Example 1:

[0063] Compared with Example 1, the fine spherical titanium alloy powder was not sieved during the preparation of the titanium alloy powder in this comparative example. The remaining steps and parameters were the same and will not be repeated in this comparative example. Finally, a high-fluidity titanium alloy powder was obtained.

[0064] Comparative Example 2:

[0065] Compared with Example 1, this comparative example did not add PdCl3 during the preparation of the synergist. The remaining steps and parameters were the same and will not be repeated in this comparative example. Finally, a high-fluidity titanium alloy powder was obtained.

[0066] Comparative Example 3:

[0067] Compared with Example 1, this comparative example did not add a synergist during the preparation of the high-flowability titanium alloy powder. The remaining steps and parameters were the same and will not be repeated in this comparative example. Finally, a high-flowability titanium alloy powder was obtained.

[0068] Comparative Example 4:

[0069] Compared with Example 1, this comparative example did not add a flow aid (TiCl4) during the preparation of the high-flowability titanium alloy powder. The remaining steps and parameters were the same and will not be repeated in this comparative example. Finally, a high-flowability titanium alloy powder was obtained.

[0070] Comparative Example 5:

[0071] Compared with Example 1, this comparative example only replaces the "synergist with a particle size of 21-30 μm" with the "synergist with a particle size of 50-61 μm". The remaining steps and parameters are the same and will not be repeated in this comparative example. Finally, a high-fluidity titanium alloy powder is obtained;

[0072] Comparative Example 6:

[0073] Compared with Example 1, this comparative example only replaces the "synergist with a particle size of 21-30 μm" with the "synergist with a particle size of 13-15 μm". The remaining steps and parameters are the same and will not be repeated in this comparative example. Finally, a high-fluidity titanium alloy powder is obtained;

[0074] Comparative Example 7:

[0075] Compared with Example 1, this comparative example only replaces the "flow aid (TiCl4) with a particle size of 21-30 μm" with the "flow aid (TiCl4) with a particle size of 50-61 μm", and the remaining steps and parameters are the same, which will not be repeated in this comparative example, and finally obtains a high-flowability titanium alloy powder;

[0076] Comparative Example 8:

[0077] Compared with Example 1, this comparative example only replaces the "flow aid (TiCl4) with a particle size of 21-30 μm" with the "flow aid (TiCl4) with a particle size of 13-15 μm", and the remaining steps and parameters are the same, which will not be repeated in this comparative example, and finally obtains a high-flowability titanium alloy powder;

[0078] Comparative Example 9:

[0079] Compared with Example 1, this comparative example did not add a synergist and a flow aid (TiCl4) during the preparation of the titanium alloy powder with high fluidity. The remaining steps and parameters were the same and will not be repeated in this comparative example. Finally, a high fluidity titanium alloy powder was obtained.

[0080] Performance testing:

[0081] Determination of stability:

[0082] Referring to the determination standard of GB / T1480-2012 "Determination of Particle Size by Dry Sieving of Metal Powders", 100 g of high-flowability titanium alloy powder was sieved step by step using sieves of different aperture sizes. After sieving, the powder on each sieve surface and the bottom plate was weighed (weighing to the nearest 0.1 g), and the proportion of titanium alloy powder with a particle size between 21 and 30 μm was calculated. Using this method, the proportion (%) of high-flowability titanium alloy powder with a particle size between 21 and 30 μm in the freshly prepared high-flowability titanium alloy powders of Examples 1 to 5 and Comparative Examples 1 to 10 and the titanium alloy powders stored in a non-sealed environment for 100 days after preparation was determined. The stability (%) of the high-flowability titanium alloy powder was then calculated according to the following formula;

[0083] The stability calculation formula is: Stability (%) = W0-W1

[0084] Wherein, W0 is the proportion (%) of high-flowability titanium alloy powder with a particle size between 21 and 30 μm in the freshly prepared high-flowability titanium alloy powder; W1 is the proportion (%) of high-flowability titanium alloy powder with a particle size between 21 and 30 μm in the high-flowability titanium alloy powder stored in a non-sealed environment for 100 days after preparation;

[0085] Determination of fluidity:

[0086] With reference to the determination standard of GB / T1482-2022 "Standard funnel method for determination of metal powder fluidity (Hall rheometer)", the flowability (s·50g) of 50g high-flowability titanium alloy powder just prepared in Examples 1 to 5 and Comparative Examples 1 to 10 and 50g high-flowability titanium alloy powder stored in a non-sealed environment for 100 days after preparation was measured by a Hall rheometer. -1 ) determination; the determination results are shown in Table 1;

[0087] Determination of oxygen content:

[0088] With reference to the test standard GB / T5158.4-2001 "Determination of Total Oxygen Content of Metal Powders - Reduction-Extraction Method," the oxygen content (ppm) was measured on 50 g of the freshly prepared high-flowability titanium alloy powders from Examples 1 to 5 and Comparative Examples 1 to 10, and on 50 g of the high-flowability titanium alloy powders stored in a non-sealed environment for 100 days after preparation. The results are shown in Table 1.

[0089] Determination of bulk density:

[0090] With reference to the determination standard of GB / T1479.1-2011 "Determination of bulk density of metal powders Part 1: Funnel method", the bulk density (g·cm) of 50g high-flowability titanium alloy powders prepared in Examples 1 to 5 and Comparative Examples 1 to 10 was measured. -3 ) determination; the determination results are shown in Table 1;

[0091] Determination of fracture toughness:

[0092] According to the test standard of GB / T7732-2008 "Metallic Material Surface Crack Tensile Test Method for Fracture Toughness", the high-fluidity titanium alloy powders prepared in Examples 1 to 5 and Comparative Examples 1 to 10 were prepared into surface crack tensile specimens, and then the fracture toughness (MPa·m 1 / 2 ) determination; the determination results are shown in Table 1;

[0093] Table 1

[0094]

[0095] Data Analysis:

[0096] As can be seen from Table 1, the high-fluidity titanium alloy powder prepared by the present invention has better stability, fluidity, oxygen content stability, bulk density (sphericity) and fracture toughness of the prepared test pieces;

[0097] This may be because the addition of the flow aid of the present invention can produce a stable nano-scale passivation film on the surface of the titanium alloy powder, thereby improving the fluidity of the titanium alloy powder and reducing the possibility of the titanium alloy powder adsorbing interstitial elements such as oxygen and nitrogen in the environment, so that the purity of the prepared high-fluidity titanium alloy powder is higher; the synergist can react with the passivation film when the high-fluidity titanium alloy powder is subjected to high-temperature treatment, thereby improving the plasticity of the high-fluidity titanium alloy powder and the fracture toughness of the prepared device. Therefore, compared with the prior art, the titanium alloy powder prepared by the present invention does not affect the plasticity such as the fracture toughness of the prepared specimen, while also making the prepared titanium alloy powder have better stability, fluidity, oxygen content stability and sphericity. The present invention also adjusts the particle size of the titanium alloy powder, the particle size of the flow aid and the particle size of the synergist, so that the particle size of the prepared high-fluidity titanium alloy powder is maintained between 21-30μm, thereby further improving the molding ability of the high-fluidity titanium alloy powder and the mechanical properties of the prepared specimen.

[0098] Those skilled in the art should understand that the discussion of any of the above embodiments is merely illustrative and is not intended to imply that the scope of the present invention is limited to these examples. Within the scope of the present invention, the technical features in the above embodiments or different embodiments may be combined, the steps may be implemented in any order, and there are many other variations of the different aspects of the present invention as described above, which are not provided in detail for the sake of simplicity.

[0099] The present invention is intended to cover all such substitutions, modifications and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for preparing high-fluidity titanium alloy powder, characterized in that: The following steps are involved: Step S1: After introducing a protective gas, the titanium alloy wire is fed into a plasma generator for vaporization and melting to form a fine spherical titanium alloy powder, which is then sieved under the protective atmosphere to obtain a titanium alloy powder; Step S2: spraying a flow aid onto the surface of the titanium alloy powder, stirring evenly, and then spraying a synergist and stirring evenly to obtain a high-flowability titanium alloy powder; The particle size of the flow aid is 21-30 μm; The flow aid is any one of metal chloride and halogenated hydrocarbon organic compound; The particle size of the synergist is 21-30 μm; The synergist is prepared from PdCl3 and PtCl2.

2. The method for preparing high-fluidity titanium alloy powder according to claim 1, characterized in that: The protective gas flow rate in step S1 is 1-6 slpm; The titanium alloy wire feeding rate in step S1 is 10-600 g / min; The power of the plasma generator in step S1 is 15-200KW, the pressure is 103.4-130.9KPa, the central gas flow rate is 8-100slpm, the auxiliary gas flow rate is 25-100slpm, the argon flow rate is 30-300slpm, and the hydrogen flow rate is 2-80slpm.

3. The method for preparing high-fluidity titanium alloy powder according to claim 1, characterized in that: The diameter of the titanium alloy wire is 0.1-10 mm.

4. The method for preparing high-fluidity titanium alloy powder according to claim 1, wherein: The titanium alloy wire in step S1 is any one of α-type titanium alloy, α+β-type titanium alloy, and TiAl-type titanium alloy.

5. The method for preparing high-fluidity titanium alloy powder according to claim 1, wherein: In step S1, the central gas is argon; In step S1, the auxiliary gas is argon; The protective gas in step S1 is argon.

6. The method for preparing high-fluidity titanium alloy powder according to claim 1, characterized in that: The particle size of the titanium alloy powder in step S1 is 21-30 μm; The thickness of the passivation layer on the surface of the high-fluidity titanium alloy powder in step S1 is 1-7 nm.

7. The method for preparing high-fluidity titanium alloy powder according to claim 1, characterized in that: The metal chloride is any one of TiCl4 and SnCl4; The halogenated hydrocarbon organic compound is any one of CHCl3, CH2Cl2, C2HCl3, C2Cl4, and CCl4.

8. The method for preparing high-fluidity titanium alloy powder according to claim 1, wherein: The preparation method of the synergist is as follows: PdCl3 and PtCl2 are mixed evenly to obtain a synergist.

9. The method for preparing high-fluidity titanium alloy powder according to claim 8, characterized in that: The mass ratio of PdCl3 to PtCl2 is 0.005-0.01:0.005-0.

02.

10. The method for preparing high-fluidity titanium alloy powder according to claim 1, characterized in that: The mass ratio of the flow aid, synergist and titanium alloy powder in step S2 is 0.01-1:0.01-0.03:100.

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