Titanium-based composite material based on resistance seam welding process and preparation method and application thereof

Abstract

The application provides a titanium-based composite material based on a resistance seam welding process and a preparation method and application thereof, and relates to the technical field of resistance seam welding additive preparation. The preparation method comprises the following steps: mixing and ball-milling hydrogenated dehydrogenated titanium powder and TiB2 powder to obtain a mixed powder; the mass percentage of the hydrogenated dehydrogenated titanium powder in the mixed powder is 90-99.5%, and the balance is TiB2 powder; drying treatment of the mixed powder in a vacuum environment to obtain a composite modified powder; and surface layer-by-layer surfacing of the composite modified powder on a resistance seam welding device to obtain a titanium-based composite material. The preparation method in the application can reduce the cost by using low-cost hydrogenated dehydrogenated titanium as raw material, and the titanium-based composite material prepared by using the resistance seam welding process has excellent mechanical properties and quality.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of resistance seam welding additive manufacturing, and particularly relates to a titanium-based composite material based on a resistance seam welding process and a preparation method and application thereof. BACKGROUND

[0002] In traditional additive manufacturing technologies, such as selective laser melting technology and electron beam melting technology, a high-energy light beam is used as a heat source to melt and solidify materials layer by layer to manufacture components with complex shapes. However, the materials prepared by these technologies have similar strength to forged parts, but have solidification structure defects, resulting in low plasticity and fatigue performance of the components.

[0003] Titanium alloys are widely used in aerospace, automotive and energy fields due to their low density, high specific strength, excellent high and low temperature performance and corrosion resistance. Under the background of continuous development of science and technology and increasing demand in application fields, traditional titanium and titanium alloy materials have been unable to fully meet the demand, and therefore further improvement of titanium alloy materials is urgently needed.

[0004] However, when improving the titanium alloy material, ceramic reinforcing phases such as TiB, TiC and SiC are often added to the titanium alloy material to improve the performance of the titanium alloy material. However, the addition of these reinforcing phases brings greater challenges to the processing of titanium alloy which is not good in processing. Therefore, it is urgent to provide a solution to improve this problem. SUMMARY

[0005] The present application aims to provide a titanium-based composite material based on a resistance seam welding process and a preparation method and application thereof. By using low-cost hydrogenated dehydrogenated titanium as raw material, the cost can be reduced, and the titanium-based composite material prepared by the resistance seam welding process has excellent mechanical properties and quality.

[0006] In a first aspect, the present application provides a titanium-based composite material based on a resistance seam welding process, comprising the following steps:

[0007] Hydrogenated dehydrogenated titanium powder is mixed with TiB2 powder and ball milled to obtain a mixed powder; wherein the mass percentage of hydrogenated dehydrogenated titanium powder in the mixed powder is 90-99.5%, and the balance is TiB2 powder;

[0008] The mixed powder is dried in a vacuum environment to obtain a composite modified powder;

[0009] The composite modified powder is filled on a resistance seam welding device to perform surface layer-by-layer surfacing to obtain a titanium-based composite material.

[0010] The titanium-based composite material based on the resistance seam welding process has the beneficial effects that: after ball milling, the irregularly shaped hydrogenated dehydrogenated titanium powder is shaped into a spherical or near-spherical shape, and the originally dispersed TiB2 powder can be wrapped around the periphery of the titanium powder, and the composite modified powder is obtained, and after the titanium-based composite material is prepared through the resistance seam welding process, the whisker-shaped TiB2 reinforcing phase is uniformly dispersed in the titanium-based composite material, the structure of the composite material has excellent mechanical properties, and the strength and fatigue resistance of the composite material can also be improved. In addition, the ball milling process can also improve the flowability and uniformity of the composite modified powder, which is beneficial to improving the efficiency and quality in the process of manufacturing the resistance seam welding process; and since the cost of the hydrogenated dehydrogenated titanium powder is significantly lower than that of the spherical titanium powder, the manufacturing cost of the titanium-based composite material can be reduced.

[0011] Optionally, in the step of mixing the hydrogenated dehydrogenated titanium powder and the TiB2 powder and ball milling to obtain the mixed powder, the particle size of the hydrogenated dehydrogenated titanium powder is 20-100 μm, and the particle size of the TiB2 powder is 0.5-2 μm.

[0012] Optionally, in the step of mixing the hydrogenated dehydrogenated titanium powder and the TiB2 powder and ball milling to obtain the mixed powder, the step includes mixing the hydrogenated dehydrogenated titanium powder and the TiB2 powder and ball milling in a protective atmosphere.

[0013] Optionally, in the step of mixing the hydrogenated dehydrogenated titanium powder and the TiB2 powder and ball milling to obtain the mixed powder, the step includes mixing the hydrogenated dehydrogenated titanium powder and the TiB2 powder to obtain the primary mixed powder, and mixing the primary mixed powder with a dispersing agent and ball milling to obtain the mixed powder; wherein the mass percentage of the dispersing agent in the primary mixed powder is 0.1-1%.

[0014] Optionally, in the step of mixing the hydrogenated dehydrogenated titanium powder and the TiB2 powder and ball milling to obtain the mixed powder, the ball milling parameters are: ball-to-material ratio 5:1, ball milling speed 150-250 rpm, and ball milling time 2-6 h, and each ball milling for 0.5 h stops for 10 min.

[0015] Optionally, in the process of drying the mixed powder in a vacuum environment to obtain the composite modified powder, the vacuum drying parameters are controlled to be: temperature 60-80℃, drying time 6-8 h, and vacuum degree 10 -1 ~10 -3 Pa.

[0016] Optionally, during the step of filling the composite modified powder on the resistance seam welding device to make the titanium-based composite material by surface layer-by-layer surfacing, the parameters of the resistance seam welding device are controlled as follows: welding current 0.1-18 kA, welding speed 0.1-5 m / s, electrode pressure 0.1-6.3 kN, upper electrode stroke 0.1-80 mm, and welding frequency 50 Hz.

[0017] In a second aspect, the present application further provides a titanium-based composite material prepared by any of the optional preparation methods described above.

[0018] In a third aspect, the present application further provides an application of the titanium-based composite material prepared by any of the optional preparation methods described above.

[0019] Optionally, the titanium-based composite material is applied to the fields of aerospace, automobile and energy to prepare structural parts, components and wear-resistant materials. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 FIG. 1 is a flow chart of a preparation method of a titanium-based composite material based on a resistance seam welding process according to an embodiment of the present application;

[0021] Figure 2 FIG. 2 is a schematic diagram showing the morphological changes of raw materials in the preparation method according to an embodiment of the present application;

[0022] Figure 3 FIG. 3 is a micro-morphology diagram of the titanium-based composite material according to an embodiment 1 of the present application. DETAILED DESCRIPTION

[0023] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions of the embodiments of the present application will be described clearly and completely below. Obviously, the described embodiments are some but not all of the embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative efforts belong to the scope of the present application. Unless otherwise defined, the technical terms or scientific terms used herein should be understood as the common meanings thereof by those skilled in the art. The terms such as “comprise” and the like used herein mean that the elements or objects before the terms encompass the elements or objects listed after the terms and their equivalents, and do not exclude other elements or objects.

[0024] Referring to Figure 1 The embodiments of the present application provide a preparation method of a titanium-based composite material based on a resistance seam welding process, which comprises the following steps:

[0025] S1, ball milling and mixing: mixing the hydrogenated and dehydrogenated titanium powder and the TiB2 powder and ball milling to obtain a mixed powder; wherein the mass percentage of the hydrogenated and dehydrogenated titanium powder in the mixed powder is 90-99.5%, and the balance is the TiB2 powder;

[0026] S2, vacuum drying: drying the mixed powder in a vacuum environment to obtain a composite modified powder;

[0027] S3, resistance additive: filling the composite modified powder on a resistance seam welding device to perform surface layer-by-layer surfacing to obtain a titanium-based composite material.

[0028] Specifically, the TiB2 and the hydrogenated and dehydrogenated titanium powder react as follows: Ti + TiB2 = 2TiB.

[0029] Referring to Figure 2 After steps S1 and S2, the originally irregularly shaped hydrogenated and dehydrogenated titanium powder is shaped into a spherical or near-spherical shape, and the originally dispersed TiB2 powder can be wrapped around the outer periphery of the titanium powder to obtain a composite modified powder. After the titanium-based composite material is obtained through the resistance seam welding process, the titanium-based composite material has a uniform dispersion of whisker-shaped TiB reinforcing phases inside the titanium-based composite material. The structure of the composite material has excellent mechanical properties, and can also improve the strength and fatigue resistance of the composite material. In addition, the ball milling process can also improve the flowability and uniformity of the composite modified powder, which is beneficial to improving the efficiency and quality during the resistance seam welding process.

[0030] In some embodiments, the hydrogenated and dehydrogenated titanium powder is prepared by reacting raw sponge titanium with hydrogen and then crushing and removing hydrogen. The elemental composition and content are as follows: 0.245 at.% of O, 0.007 at.% of N, 0.032 at.% of C, 0.018 at.% of H, 0.020 at.% of Fe, and the balance of Ti.

[0031] In some embodiments, when step S1 is performed, the particle size of the hydrogenated and dehydrogenated titanium powder is 20-100 μm, and the particle size of the TiB2 powder is 0.5-2 μm.

[0032] In some embodiments, when step S1 is performed, it includes mixing the hydrogenated and dehydrogenated titanium powder and the TiB2 powder, and then ball milling in a protective atmosphere to obtain a mixed powder.

[0033] In some further embodiments, the protective atmosphere is an inert gas, such as argon.

[0034] In some embodiments, when step S1 is performed, it includes mixing the hydrogenated and dehydrogenated titanium powder and the TiB2 powder to obtain a preliminary mixed powder, and then ball milling the preliminary mixed powder with a dispersant to obtain a mixed powder.

[0035] In some further embodiments, the dispersant accounts for 0.1-1% of the mass percentage of the initial mixed powder. Specifically, the dispersant can be stearic acid.

[0036] In some embodiments, when performing step S1, the ball milling parameters are controlled as follows: ball-to-material ratio of 5:1, ball milling rotation speed of 150-250 rpm, and ball milling time of 2-6 h, with 10 min of stop rotation every 0.5 h of ball milling.

[0037] In some embodiments, when performing step S2, the mixed powder is transferred to a vacuum drying box for vacuum drying treatment, and the vacuum drying parameters are controlled as follows: temperature of 60-80℃, drying time of 6-8 h, and vacuum degree of 10 -1 ~10 -3 Pa.

[0038] In some embodiments, when performing step S3, the parameters of the resistance seam welding equipment are controlled as follows: welding current of 0.1-18 kA, welding speed of 0.1-5 m / s, electrode pressure of 0.1-6.3 kN, upper electrode stroke of 0.1-80 mm, and welding frequency of 50 Hz.

[0039] In some embodiments, when performing step S3, the composite modified powder is pre-transferred to the heating cavity of the resistance seam welding equipment for preheating.

[0040] The present application also provides a titanium-based composite material prepared according to any of the above embodiments.

[0041] The present application also provides an application of the titanium-based composite material prepared according to any of the above embodiments. Specifically, the titanium-based composite material can be applied to the preparation of structural parts, components, and wear-resistant materials in the fields of aerospace, automobiles, and energy.

[0042] Embodiment 1

[0043] The present embodiment 1 provides a preparation method of a titanium-based composite material based on a resistance seam welding process, which comprises the following steps:

[0044] S1, ball milling of mixed powder: 950 g of hydrogenated dehydrogenated titanium powder with a particle size of 40-90 μm is mixed with 50 g of TiB2 powder with a particle size of 0.5-1 μm, and then is put into a ball mill preloaded with 5 kg of agate balls. Argon gas is filled into the ball mill, and 0.3 wt.% of stearic acid is added into the ball mill to mix with the mixed powder. The ball milling rotation speed is set to 250 rpm, the ball milling time is set to 6 h, and 10 min of stop rotation is performed every 0.5 h of ball milling.

[0045] S2, vacuum drying: the mixed powder after ball milling is transferred to a vacuum drying box, and is dried in an environment with a temperature of 60℃, a vacuum degree of 5×10 - 2 Pa for 8 h, and then is taken out to obtain a composite modified powder.

[0046] S3, resistance additive: the composite modified powder is pre-positioned on the platform of the resistance seam welding equipment, the seam welding parameters are set as: welding current 18 kA, welding speed 5 m / s, electrode pressure 5 kN, upper electrode stroke 60 mm and frequency 50 Hz, and a titanium-based composite material is prepared by means of surface layer-by-layer surfacing.

[0047] Example 2

[0048] The titanium-based composite material preparation method based on the resistance seam welding process provided in this embodiment 2 is different from that of embodiment 1 in that in step S3, the seam welding parameter welding speed is set to 10 m / s.

[0049] Example 3

[0050] The titanium-based composite material preparation method based on the resistance seam welding process provided in this embodiment 3 is different from that of embodiment 1 in that in step S1, 995 g of hydrogenated dehydrogenated titanium powder is mixed with 5 g of TiB2 powder for ball milling; and in step S3, the seam welding parameter welding speed is set to 10 m / s.

[0051] Performance detection

[0052] After the microfocus CT three-dimensional scanning result of the titanium-based composite material in the above embodiments 1-3, it can be known that the compactness of the printed part is higher than 99.7%. The titanium-based composite material in the above embodiments 1-3 is surface polished and polished, and the Vickers hardness test is carried out based on GB / T4340.1-2009, and the test results are shown in Table 1; the titanium-based composite material in the above embodiments 1-3 is made into a standard tensile sample, and the room temperature tensile test is carried out based on GB / T228.1-2010, and the test results are shown in Table 1.

[0053] Table 1: Mechanical property test results of titanium-based composite material in embodiments 1-3

[0054] Vickers hardness / Hv Tensile strength / MPa Elongation / % Example 1 478 1305 0.5 Example 2 445 1278 1.3 Example 3 397 1136 7

[0055] Referring to Figure 3 , the titanium-based composite material in embodiment 1 has whisker-shaped TiB reinforcing phase, so as to effectively improve the mechanical properties (hardness and tensile strength) of itself. Referring to Table 1, in combination with embodiment 1 and embodiment 3, it can be known that increasing the addition amount of TiB2 in the titanium-based composite material can improve the hardness and tensile strength of the titanium-based composite material, but will cause the elongation of itself to decrease; in combination with embodiment 1 and embodiment 2, it can be known that by changing the welding speed during seam welding, the elongation of the composite material can be improved, but the hardness and tensile strength will be slightly decreased.

[0056] While the embodiments of the application have been illustrated and described in detail, it will be readily apparent to those skilled in the art that various modifications and changes can be made to the embodiments without departing from the scope and spirit of the application, as described in the claims. Moreover, the application described is not limited in its application to the details set forth in the description or illustrated in the drawings. The application is capable of other embodiments and of being practiced or carried out in various ways.

Claims

1. A method for producing a titanium-based composite based on a resistance seam welding process, characterized in that, The method comprises the following steps: mixing and ball-milling the hydrogenated dehydrogenated titanium powder and the TiB2 powder to obtain a mixed powder, wherein the mass percentage of the hydrogenated dehydrogenated titanium powder in the mixed powder is 90-99.5%, and the balance is the TiB2 powder; drying the mixed powder in a vacuum environment to obtain a composite modified powder; filling the composite modified powder into a resistance seam welding device to perform surface layer-by-layer surfacing to obtain a titanium-based composite material; when performing the surface layer-by-layer surfacing, the parameters of the resistance seam welding device are controlled as follows: welding current 18 kA, welding speed 5 m / s or 10 m / s, electrode pressure 5 kN, upper electrode stroke 60 mm, and welding frequency 50 Hz.

2. The production method according to claim 1, characterized by, In the step of mixing and ball-milling the hydrogenated dehydrogenated titanium powder and the TiB2 powder to obtain a mixed powder, the particle size of the hydrogenated dehydrogenated titanium powder is 20-100 μm, and the particle size of the TiB2 powder is 0.5-2 μm.

3. The preparation method according to claim 1, characterized in that, In the step of mixing and ball-milling the hydrogenated dehydrogenated titanium powder and the TiB2 powder to obtain a mixed powder, the hydrogenated dehydrogenated titanium powder and the TiB2 powder are mixed and ball-milled in a protective atmosphere.

4. The method of claim 1, wherein, In the step of mixing and ball-milling the hydrogenated dehydrogenated titanium powder and the TiB2 powder to obtain a mixed powder, the hydrogenated dehydrogenated titanium powder and the TiB2 powder are mixed to obtain a primary mixed powder, and the primary mixed powder is mixed with a dispersant and then ball-milled to obtain the mixed powder; wherein the mass percentage of the dispersant in the primary mixed powder is 0.1-1%.

5. The preparation method according to claim 1, characterized in that, In the step of mixing and ball-milling the hydrogenated dehydrogenated titanium powder and the TiB2 powder to obtain a mixed powder, the ball-milling parameters are as follows: ball-to-material ratio 5:1, ball-milling rotation speed 150-250 rpm, and ball-milling time 2-6 h, and the ball-milling is stopped for 10 min every 0.5 h.

6. The method of claim 1, wherein, The process of drying the mixed powder in a vacuum environment to obtain the composite modified powder comprises controlling the vacuum drying parameters as follows: temperature 60-80℃, drying time 6-8h, and vacuum degree 10 -1 -3 Pa.​ 7. A titanium-based composite material prepared by the method according to any one of claims 1 to 6.

8. Use of a titanium-based composite material prepared by the method according to any one of claims 1 to 6.

9. Use according to claim 8, characterized in that, The titanium-based composite material is used in the fields of aerospace, automobiles, and energy to prepare structural parts, components, and wear-resistant materials.

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