Ti-O-Fe alloy design and plasma arc hot wire-powder composite manufacturing method

Abstract

The invention discloses a Ti-O-Fe alloy and a plasma arc hot wire-powder composite manufacturing method, and belongs to the field of material design and manufacturing. According to the preparation method, Fe2O3 powder, Fe powder and Ti powder are ball-milled and uniformly mixed according to a certain proportion to form composite powder; the powder is coaxially fed into a molten pool through a plasma arc, a pure Ti welding wire is fed from the side face, uniform mixing and solidification forming of the welding wire and the powder in the molten pool are achieved through the efficient melting effect of the high-temperature plasma arc and the heat efficiency of the welding wire improved by a bypass hot wire, and the Ti-O-Fe alloy uniform in structure and excellent in performance is prepared. By precisely designing alloy components, the content of O is controlled to be 0.5%-0.6%, the content of Fe is 3.2%-3.5%, oxygen serves as a strengthening element of an alpha phase, the strength of the alloy is remarkably improved, and meanwhile growth of beta grains is effectively inhibited; and as a beta-phase stable element, iron enhances the plasticity and toughness of the material.

Description

Technical Field

[0001] The present invention relates to the field of material design and manufacturing, and particularly to a Ti-O-Fe alloy design and a plasma arc hot wire-powder composite manufacturing method. Background Art

[0002] Titanium alloys have been widely used in the fields of aerospace, energy, medical treatment, and chemical engineering due to their high specific strength, good corrosion resistance, and biocompatibility. The main microstructures of industrial titanium alloys are based on the hexagonal close-packed (HCP) α phase and the body-centered cubic (BCC) β phase. The reasonable regulation of the two phases can achieve the balance of high strength and excellent toughness. Among them, α-β titanium alloys are the mainstay of the titanium industry, and their main microstructures include lamellar α-β, equiaxed α-β, and spherical α structures in the α-β lamella. These microstructures make α-β titanium alloys suitable for a variety of industrial applications, but it is necessary to adjust the microstructure of α-β titanium alloys by adding elements.

[0003] The main α-phase stabilizing elements are Al, O, N, and C. Among them, O, as an inexpensive and effective α-phase strengthening agent, has the ability to significantly improve strength and inhibit the growth of β grains. However, the increase in oxygen content will cause embrittlement effects, and the oxygen content needs to be strictly controlled. On the other hand, the β-phase stabilizing elements are Mo, V, Ta, Nb, Fe, Mn, Cr, Ni, Cu, Si, and H. Among them, Fe is significant in strengthening effect due to its low cost. However, Fe is prone to form β-region segregation during the casting process, resulting in non-uniform mechanical properties, and its dosage must be significantly controlled. Therefore, it is crucial to regulate the ratio of trace elements and design a suitable Ti-O-Fe alloy composition and manufacturing method.

[0004] In recent years, the development of additive manufacturing technology has provided new possibilities for the design and preparation of titanium alloys. However, the cost of laser powder additive manufacturing is high, and the component regulation of arc wire additive manufacturing is difficult. The cost of preparing multi-element alloy welding wires is high, and some materials cannot be made into welding wires. The wire additive and coaxial powder feeding methods adopted in other studies have certain limitations because the large arc blowing force will blow away the coaxially fed powder, resulting in large spatter and large powder loss. The plasma arc hot wire technology has high welding stability and deposition efficiency. Based on the manufacturing principle of the plasma arc hot wire welding torch, in this patent, a powder feeding channel is opened near the tungsten electrode, and argon gas is used to feed the powder into the arc. Argon gas serves as both the powder feeding gas and the shielding gas, avoiding the interference of the arc on powder feeding. At the same time, taking advantage of the coupling of the hot wire and the plasma arc, the plasma arc will change from a vertical shape to a deflected shape, facilitating the direct feeding of the powder into the arc. This plasma hot wire-powder composite additive manufacturing method provides a new idea for the low-cost, high-efficiency additive manufacturing and commercial application of Ti-O-Fe alloys. Summary of the Invention

[0005] The object of the present invention is to provide a design and manufacturing method of a Ti-O-Fe alloy, aiming to prepare a titanium alloy material with high strength, good toughness and uniform microstructure by optimizing the composition design and manufacturing process, so as to meet the high-performance requirements in the fields of aerospace, energy, medical treatment and chemical industry.

[0006] The present invention provides a Ti-O-Fe alloy. By mass fraction, the chemical composition of the Ti-O-Fe alloy is: O: 0.5% - 0.6%, Fe: 3.2% - 3.5%, Ti: 95.9% - 96.3%; the tensile strength of the Ti-O-Fe alloy is 900 - 1100 MPa.

[0007] The present invention also provides a method for manufacturing a Ti-O-Fe alloy by plasma arc hot wire-powder composite, which includes the following steps:

[0008] Step 1: Mix Fe 2 O 3 powder, Fe powder and Ti powder evenly with a ball mill and then dry them to obtain composite powder;

[0009] Step 2: Use a titanium alloy plate as the substrate, place the plasma welding torch above the substrate, and there is a powder feeding channel inside the plasma welding torch; a pure titanium welding wire is located beside the plasma welding torch, and there is a bypass hot wire current on one side of the pure titanium welding wire;

[0010] Step 3: Turn on the plasma power supply, protective gas and plasma gas switches. After the arc is stable, introduce the titanium welding wire into the arc area, and at the same time feed the composite powder. Use the high-temperature plasma arc to melt the welding wire and powder to form a stable molten pool; stack the molten pool metal layer by layer on the substrate to form a titanium alloy layer;

[0011] Step 4: After completing the additive manufacturing, turn off the power supply and stop wire feeding and powder feeding.

[0012] Further, in step 1, the particle size of the Fe 2 O 3 powder is 500 nm - 5 μm, the particle size of the Fe powder is 15 - 50 μm, and the particle size of the Ti powder is 50 - 200 μm; the mass ratio of the Fe 2 O 3 powder, Fe powder and Ti powder is 1:4.2:21.8.

[0013] Further, in step 1, the rotation speed of the ball mill is 200 rpm, the time is 8 h, and the grinding is paused for 10 min every 1 h during the grinding process; the whole grinding process is carried out under argon protection.

[0014] Further, in step 1, the drying temperature is 120 - 150 °C and the time is 1 - 2 h.

[0015] Further, in step 2, the diameter of the pure titanium wire is 1.2 - 1.6 mm; the diameter of the powder feeding channel in the welding torch is 5 - 10 mm, and the diameter of the tungsten electrode in the welding torch is 3.2 - 3.8 mm.

[0016] Further, in step 3, the wire feeding rate of the pure titanium wire and the powder feeding rate of the composite powder are 1 m / min:2 g / min; the wire feeding rate of the pure titanium wire is 1 - 6 m / min, and the powder feeding rate of the composite powder is 2 - 12 g / min.

[0017] Further, in step 3, the current of the arc power source is 150 - 180 A, and the voltage is 18 - 21 V; the current of the bypass hot wire is 40 - 60 A.

[0018] Further, in step 3, the coupling angle between the pure titanium wire and the arc is 45° - 60°, and the powder feeding angle of the composite powder in the powder feeding direction and the vertical direction is 15 - 20°.

[0019] Further, in step 3, the shielding gas is argon, and the flow rate is 15 - 20 L / min; the ion gas is argon with a flow rate of 0.5 - 1 L / min.

[0020] The beneficial effects of the present invention are as follows:

[0021] (1) The present invention optimizes the composition design of the Ti - O - Fe alloy to obtain excellent performance. By precisely designing the alloy composition, the O content is controlled at 0.5% - 0.6%, and the Fe content is 3.2% - 3.5%. Oxygen, as a strengthening element of the α phase, significantly improves the strength of the alloy and effectively inhibits the growth of β grains; iron, as a β - phase stabilizing element, enhances the plasticity and toughness of the material. The powder mixing mass ratio (Fe 2 O 3 :Fe:Ti = 1:4.2:21.8) is optimized, with a high proportion of Ti powder, effectively ensuring the uniform distribution of O and Fe during the wire - powder composite additive manufacturing process.

[0022] (2) By designing a powder feeding channel near the tungsten electrode of the plasma arc hot wire welding torch, and using argon as the powder feeding medium and shielding gas, the present invention successfully avoids the interference of the arc on the powder feeding process. At the same time, by utilizing the coupling effect of the bypass hot wire and the plasma arc, the plasma arc is transformed from the traditional vertical form to a deflected form, greatly optimizing the powder capture efficiency and melting uniformity in the arc.

[0023] (3) The present invention designs a plasma arc hot wire - powder composite additive manufacturing method, which has a fast forming speed, low cost compared with the prior art, and can be mass - produced. Description of the Drawings

[0024] Figure 1 Flow chart for manufacturing composite Ti-O-Fe alloy powder;

[0025] Figure 2 Schematic diagram of plasma arc hot wire-powder composite additive manufacturing of Ti-O-Fe alloy.

[0026] Among them, the reference numerals are: 1-water tank, 2-powder box, 3-powder feeding speed regulating device, 4-argon gas flow regulating device, 5-tungsten electrode, 6-insulating ceramic, 7-plasma gas, 8-water cooling channel (inlet), 9-water cooling channel (outlet), 10-protective gas, 11-plasma welding torch housing, 12-argon gas cylinder, 13-bypass hot wire current regulator, 14-wire feeder, 15-Ti wire, 16-deposited layer, 17-copper nozzle, 18-powder feeding angle, 19-composite powder, 20-coupled arc, 21-molten droplet, 22-Ti substrate, 23-coupling morphology diagram of welding wire and plasma arc, 24-plasma power supply. Detailed implementation mode

[0027] The present invention will be further described below with reference to the accompanying drawings.

[0028] The present invention discloses a method for preparing Ti-O-Fe alloy by plasma hot wire-powder composite additive manufacturing, and a wire-powder coaxial welding torch is designed by itself. At the same time, the proportion and composition of the composite powder are reasonably designed. During the preparation process, Fe 2 O 3 powder, Fe powder and Ti powder are selected as the composite powder and fed into the molten pool in cooperation with the pure titanium welding wire. Specifically, Fe 2 O 3 powder, Fe powder and Ti powder are evenly mixed by ball milling according to a certain proportion to form a composite powder. This powder is fed into the molten pool coaxially through the plasma arc, and the pure Ti welding wire is fed from the side. By utilizing the high-efficiency melting effect of the high-temperature plasma arc and the improved wire heat efficiency of the bypass hot wire, the uniform mixing and solidification forming of the welding wire and the powder in the molten pool are realized, and a Ti-O-Fe alloy with uniform structure and excellent performance is prepared.

[0029] The manufacturing method of the present invention specifically includes the following steps:

[0030] 1. Preparation of raw materials: Select pure titanium welding wire and Fe 2 O 3 powder, Fe powder and Ti powder. Since the melting point of Fe 2 O 3 is relatively high, therefore, fine Fe 2 O 3 powder with a size between 500 nm and 5 μm is selected for easy melting. The Fe powder is between 15 and 50 μm, and the Ti powder is between 50 and 200 μm. The weight ratio of the three powders is Fe2 O 3 : Fe:Ti = 1:4.2:21.8, high proportion and large size Ti powder and low proportion and small size Fe 2 O 3 powder and Fe powder are selected so that Fe powder and Fe 2 O 3 powder can be evenly distributed on the surface of Ti powder; the diameter of the pure titanium welding wire is 1.2 - 1.6 mm.

[0031] 2. Pretreatment and mixing: Fe 2 O 3 powder, Fe powder and Ti powder are evenly mixed by a ball mill, and the fluidity and uniformity of the powder are improved through powder spheroidization or surface modification technology, as Figure 1 shown.

[0032] Ball milling conditions: Set the main disk rotation speed of the ball mill to 200 rpm to ensure a moderate rotation speed, taking into account both the grinding efficiency and the stability of the powder morphology. At the same time, select grinding media made of high-hardness wear-resistant materials, such as zirconia balls or steel balls, to ensure the efficiency of the grinding process and the purity of the powder.

[0033] Grinding time and cycle control: Start the ball mill and conduct grinding operations for 8 hours. To avoid the increase in temperature inside the grinding tank and the possible agglomeration of the powder, pause the grinding for 10 minutes every 1 hour and cycle. This process can not only reduce the impact of temperature increase on the powder properties but also help the full contact between the grinding media and the powder.

[0034] Argon protection: During the entire grinding process, to avoid oxidation reactions during grinding, place the entire operation process in an argon protection environment to maintain a working atmosphere with a low oxygen content, thereby reducing the oxidation of the powder surface. The argon flow rate and the frequency of gas replacement inside the tank need to be optimized and adjusted according to specific equipment and powder properties.

[0035] Subsequently, the ground mixed powder is dried. Transfer the powder to a drying oven, set the temperature to 120 °C to 150 °C, and conduct constant-temperature drying for 2 hours. During the drying process, maintain a constant low-oxygen environment to avoid the powder surface adsorbing moisture or reacting with air. This step helps remove the residual moisture on the powder surface and in the pores, improving the mixing efficiency of the powder with the molten pool and the forming stability in the subsequent additive manufacturing process. The finally processed composite powder not only has excellent fluidity but also has a uniform particle shape, is suitable for the plasma arc wire-powder composite additive manufacturing process, and ensures uniform distribution in the molten pool and forms a high-quality alloy structure with the titanium welding wire.

[0036] 3. Manufacturing of Ti-O-Fe alloy: The Ti-O-Fe alloy is manufactured by using the plasma hot wire-powder composite additive manufacturing process. The wire feeding rate of the pure Ti wire and the powder feeding rate ratio of the premixed composite powder of Fe 2 O 3 , Fe and Ti is 1 m / min: 2 g / min. The wire feeding rate of the pure titanium wire is 1 - 6 m / min, and the powder feeding rate of the composite powder is 2 - 12 g / min. The wire and powder are fed into the molten pool simultaneously, thereby preparing the Ti-O-Fe alloy, in which the O content is 0.5% - 0.6% and the Fe content is 3.2% - 3.5%. After each layer of deposition is completed, it is cooled and the surface impurities are removed. Repeat the above steps for layer-by-layer deposition to obtain a Ti-O-Fe alloy structure with excellent performance.

[0037] As Figure 2 shown, the present invention provides a plasma hot wire-powder composite additive manufacturing device, including a welding torch and a plasma power source 24; a tungsten electrode 5 is arranged inside the insulating ceramic 6 of the welding torch, and a plasma gas channel, a water cooling channel, a powder feeding channel and a shielding gas channel are sequentially arranged outside the insulating ceramic 6; the top of the ion gas channel is connected to an ion gas device to introduce plasma gas 7; the water cooling channel (inlet) 8 and the water cooling channel (outlet) 9 are connected to a water tank 1; the top of the powder feeding channel is connected to a powder box 2, and an argon gas cylinder 12 is arranged on one side of the powder box 2 and connected through an argon gas flow control device 4. The powder box contains a composite powder 19, and the composite powder 19 is fed into the arc of the welding torch through the powder feeding channel under the protection of argon gas; the top of the shielding gas channel is connected to a shielding gas device to introduce shielding gas 10; the negative electrode of the plasma power source 24 is connected to the tungsten electrode, and the positive electrode is connected to the substrate; a wire feeder 14 is arranged beside the welding torch, and the wire in the wire feeder 14 is heated by a bypass hot wire current regulator 13 and then fed into the arc of the welding torch. The bypass hot wire current regulator 13 is connected to the positive electrode of the plasma power source 24.

[0038] Equipment preparation: Select the plasma arc wire-powder composite additive manufacturing equipment to ensure that the wire feeding, powder feeding and control systems are operating normally. Equip a wire feeding mechanism and a powder supply device to ensure that the wire feeding rate of the pure titanium wire and the powder feeding rate of the composite powder can be accurately controlled respectively.

[0039] Equipment calibration: Adjust the arc parameters of the plasma arc to ensure stable melting conditions. Calibrate the wire feeding system and the powder feeding system to ensure that the wire and powder are fed into the molten pool evenly and continuously. Check the shielding gas system to ensure a good gas protection environment in the working area.

[0040] Additive process: Take a titanium alloy plate as the substrate, place the plasma welding torch above the substrate at a certain height from the substrate. Turn on the plasma power supply, open the switches of the shielding gas and plasma gas, and start the plasma arc switch. After the arc is stable, introduce the titanium welding wire into the arc area, and at the same time feed the composite powder. Utilize the high-temperature plasma arc to melt the welding wire and powder to form a stable molten pool. Stack the molten pool metal layer by layer according to the preset path. The molten titanium welding wire and powder are evenly mixed in the molten pool and gradually cool and solidify to form a titanium alloy layer. After completing the additive manufacturing, turn off the power supply and stop wire feeding and powder feeding. Continue to supply the shielding gas until the alloy temperature drops below 200 °C.

[0041] Through the above optimized process parameters, the present invention realizes the efficient additive manufacturing of Ti-O-Fe alloy. The obtained deposited layer 16 has excellent microstructure uniformity and mechanical properties, providing a low-cost and high-performance titanium alloy manufacturing technology for the aerospace, medical device, and chemical industries.

[0042] Example 1

[0043] The present invention discloses a manufacturing process for composite Ti-O-Fe alloy powder. In the specific implementation process of the present invention, Fe 2 O 3 powder, Fe powder, and Ti powder are uniformly mixed according to the designed ratio. To ensure the fluidity and uniformity of the mixed powder, a ball mill is used for sufficient grinding, supplemented by powder spheroidization or surface modification processes to further optimize the powder characteristics. The steps include:

[0044] Step 1: Prepare the required Fe 2 O 3 powder, Fe powder, and Ti powder. Among them, the particle size range of Fe 2 O 3 powder is controlled within 500 nm to 5 μm, the particle size range of Fe powder is controlled within 15 μm to 50 μm, and the particle size range of Ti powder is controlled within 50 μm to 200 μm. The weight ratio of the three powders is Fe 2 O 3 : Fe: Ti = 1:4.2:21.8.

[0045] Step 2: After weighing, put it into the grinding tank of the ball mill. Uniformly mix Fe 2 O 3 powder, Fe powder, and Ti powder with a ball mill. The main disk rotation speed of the ball mill is 200 rpm, the grinding time is 8 h, and the grinding process is carried out under argon protection. It circulates once every hour and pauses for 10 minutes. The inert gas environment in the tank is maintained through the argon protection device to ensure that the powder will not reduce its quality due to oxidation during the grinding process. After ball milling for 8 h, the mixed powder is dried at 120 °C to 150 °C for 2 hours.

[0046] Step 3: By improving the structure of the welding torch, a powder feeding channel is arranged inside the plasma arc welding torch housing 11, and the channel diameter is 5 - 10 mm to ensure that the powder can pass through. The composite powder 19 is stably transported by the powder feeding speed regulating device 3 at a speed of 3 g / min, and the powder feeding argon gas flow rate is controlled by the argon gas flow rate regulating device 4 to be 6 - 10 L / min to ensure smooth powder transportation and the molten pool protection effect. The diameter of the tungsten electrode 5 of the welding torch is 3.2 mm, and the plasma gas 7 is provided by argon gas at 0.5 - 1 L / min to ensure a stable arc shape. The welding wire uses a pure titanium welding wire 15 with a wire diameter of 1.2 mm, which is fed into the molten pool by the wire feeder 14 at a speed of 1.5 m / min. The composite powder 19 is composed of Fe 2 O 3 powder, Fe powder and Ti powder are mixed in a certain proportion. The combination of the wire feeding speed and the powder feeding speed adopted in the present invention can obtain the required Fe and O ratios of the Ti - O - Fe alloy.

[0047] During the additive manufacturing process, the main current provided by the arc power source is set to 150 - 180 A, and the arc voltage is controlled at 18 - 21 V to ensure sufficient heat input to melt the welding wire and the powder. The bypass current is set to 40 - 60 A through the bypass hot wire current regulator 13 to form a hot wire - arc composite region 20 coupled with the plasma arc. This combination of main and bypass currents can make the coupling angle of the welding wire and the arc deviate by 45° - 60°, and at the same time, the powder feeding angle 18 between the powder feeding direction and the vertical direction is 15 - 20°. This coupled arc shape can effectively improve the powder capture rate and composition uniformity. The working temperature of the whole process is maintained stable by the water cooling channel, and the outside of the welding torch is covered with a shielding gas 10 at an argon gas flow rate of 15 - 20 L / min to comprehensively cover the molten pool and avoid the oxidation phenomenon in the high - temperature area.

[0048] The present invention innovatively selects oxygen (O) as the main element to strengthen the α phase, and uses its excellent solid solution strengthening ability to effectively improve the alloy strength, while inhibiting the growth of β grains to ensure that the alloy has excellent tissue stability. Iron (Fe) is used as the main β - phase stabilizing element, and with its low cost and high - efficiency strengthening characteristics, the balance between the alloy strength and toughness is achieved.

[0049] The present invention further clarifies the optimized range of the alloy composition. The content of oxygen (O) is controlled at 0.5% - 0.6%, which not only gives full play to its strengthening effect but also avoids embrittlement of the material caused by excessive addition; the content of iron (Fe) is controlled at 3.2% - 3.5% to balance the material strength and toughness, and through precise control, the performance non - uniformity caused by iron segregation is reduced. By reasonably adjusting the ratio of oxygen and iron, the microstructure of the alloy forms a layered α - β structure or a spherical α - β mixed structure, thereby obtaining excellent comprehensive mechanical properties.

[0050] The Ti-O-Fe alloy of the present invention is significantly innovative in both composition design and manufacturing method, and can be widely applied to the field of structural materials with high performance requirements, having important application value and promotion prospects.

[0051] The above are only specific embodiments of the present invention, enabling those skilled in the art to understand or implement the present invention. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention.

[0052] It should be understood that the present invention is not limited to the content already described above, and various modifications and changes can be made without departing from its scope. The scope of the present invention is only limited by the appended claims.

Claims

1. A Ti-O-Fe alloy, characterized in that: According to mass fraction, the chemical composition of the Ti-O-Fe alloy is: O: 0.5% to 0.6%, Fe: 3.2% to 3.5%, Ti: 95.9% to 96.3%; the tensile strength of the Ti-O-Fe alloy is 900 to 1100 MPa.

2. A plasma arc hot wire-powder composite manufacturing Ti-O-Fe alloy method, characterized in that: The following steps are involved: Step 1: Fe2O3 powder, Fe powder and Ti powder are uniformly mixed in a ball mill and then dried to obtain composite powder; Step 2: The titanium alloy plate is used as a substrate, and a plasma welding gun is placed above the substrate. A powder feeding channel is provided inside the plasma welding gun; the pure titanium welding wire is located in the bypass of the plasma welding gun, and a bypass hot wire current is provided on one side of the pure titanium welding wire; Step 3: Turn on the plasma power supply, shielding gas and plasma gas switch. After the arc is stable, introduce the titanium welding wire into the arc area and feed the composite powder at the same time. Use the high-temperature plasma arc to melt the welding wire and powder to form a stable molten pool; accumulate the molten pool metal layer by layer on the substrate to form a titanium alloy layer; Step 4: After completing additive manufacturing, turn off the power and stop feeding wire and powder.

3. The method for preparing Ti-O-Fe alloy by plasma arc hot wire-powder composite according to claim 1, characterized in that: In step 1, the particle size of the Fe2O3 powder is 500nm~5μm, the particle size of the Fe powder is 15~50μm, and the particle size of the Ti powder is 50~200μm; the mass ratio of the Fe2O3 powder, Fe powder, and Ti powder is 1:4.2:21.

8.

4. The method for preparing Ti-O-Fe alloy by plasma arc hot wire-powder composite according to claim 1, characterized in that: In step 1, the ball mill rotates at a speed of 200 rpm for 8 hours, and the grinding is stopped for 10 minutes every hour during the grinding process; the entire grinding process is carried out under argon protection.

5. The method for preparing Ti-O-Fe alloy by plasma arc hot wire-powder composite according to claim 1, characterized in that: In step 1, the drying temperature is 120-150° C. and the time is 1-2 hours.

6. The method for preparing Ti-O-Fe alloy by plasma arc hot wire-powder composite according to claim 1, characterized in that: In step 2, the diameter of the pure titanium welding wire is 1.2-1.6 mm; the diameter of the powder feeding channel in the welding gun is 5-10 mm, and the diameter of the tungsten electrode in the welding gun is 3.2-3.8 mm.

7. The method for preparing Ti-O-Fe alloy by plasma arc hot wire-powder composite according to claim 1, characterized in that: In step 3, the wire feeding rate of the pure titanium welding wire and the powder feeding rate of the composite powder are 1m / min:2g / min; the wire feeding rate of the pure titanium welding wire is 1-6m / min, and the powder feeding rate of the composite powder is 2-12g / min.

8. The method for preparing Ti-O-Fe alloy by plasma arc hot wire-powder composite according to claim 1, characterized in that: In step 3, the current of the arc power supply is 150-180A, and the voltage is 18-21V; the bypass hot wire current is 40-60A.

9. The method for preparing Ti-O-Fe alloy by plasma arc hot wire-powder composite according to claim 1, characterized in that: In step 3, the coupling angle between the pure titanium welding wire and the arc is 45° to 60°, and the feeding angle between the composite powder feeding direction and the vertical direction is 15° to 20°.

10. The method for preparing Ti-O-Fe alloy by plasma arc hot wire-powder composite according to claim 1, characterized in that: In step 3, the protective gas is argon with a flow rate of 15 to 20 L / min; the ion gas is argon with a flow rate of 0.5 to 1 L / min.

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