A method of cold spray additive manufacturing of a metal matrix

Abstract

The application relates to a cold spraying additive manufacturing method of a metal base, comprising the following steps: proportioning Ti powder, Al powder and Nb powder according to a molar ratio of 2:1:1 to obtain mixed powder; cold spraying the mixed powder to the surface of the metal base to form a deposition layer; performing heat treatment on the deposition layer to form a mixed coating layer comprising an alloy phase and a single-phase; performing mechanical processing on the mixed coating layer to form a preset shape; and performing heat treatment on the mixed coating layer after the preset shape is formed, so that the single-phase is converted into the alloy phase, and a Ti2AlNb alloy coating layer is formed. The application combines Ti2AlNb material with cold spraying, can solve the defects that the single-phase powder of Ti, Al and Nb is poor in plasticity, poor in wear resistance and difficult to work, adopts a pre-heat treatment-mechanical processing-second heat treatment mode, is stronger in plasticity compared with directly using Ti2AlNb material as a coating layer, and further improves the performance of a workpiece.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of optoelectronic materials and optoelectronic devices, in particular to a cold spraying additive manufacturing method of a metal substrate and a preparation method and application thereof. BACKGROUND

[0002] Compared with traditional thermal spraying, the cold spraying technology has the characteristics of low deposition temperature and not easy to oxidize, so it is vigorously developed. In recent years, the cold spraying process has been applied in metal additive manufacturing, damage repair of key parts in aerospace, etc.

[0003] The general process of the cold spraying additive manufacturing process is to spray on the basis of the treated cavity type preform, introduce metal powder into the spray gun, add gas, spray the surface of the preform with the spray gun to form a coating, and finally machine the parts. In the past cold spraying additive manufacturing process, single metal is often used as a coating, such as using single Al as a cold spraying material, which has good corrosion resistance, but the wear resistance of pure Al coating is poor; Ti metal is used as a cold spraying material, and due to the material itself characteristics, there will be a certain amount of micropores or microcracks under the conditions of high strength and surface oxidation; Similarly, Nb metal is used as a cold spraying material, and due to the collision of powder particles during the cold spraying process, plastic deformation deposition occurs to form a coating, and the coating has poor plasticity. Therefore, the process of using single metal as a spraying material for additive manufacturing cannot meet the quality requirements of industry.

[0004] Therefore, it is necessary to provide a cold spraying additive manufacturing method that can meet the requirements of industry. SUMMARY

[0005] The embodiment of the present application provides a cold spraying additive manufacturing method of a metal substrate to solve the problem of poor plasticity and wear resistance of the metal cold spraying coating in the related art.

[0006] The technical scheme provided by the present application is as follows:

[0007] The present application provides a cold spraying additive manufacturing method of a metal substrate, comprising the following steps:

[0008] The Ti powder, Al powder and Nb powder are mixed in a molar ratio of 2:1:1 to obtain a mixed powder;

[0009] The mixed powder is cold sprayed onto the surface of the metal substrate to form a deposition layer;

[0010] The deposition layer is heat treated to form a mixed coating including alloy phase and single phase;

[0011] The mixed coating is machined to form a predetermined shape;

[0012] The mixed coating layer after forming a preset shape is subjected to heat treatment, so that the single-phase is converted into an alloy phase, and a Ti2AlNb alloy coating layer is formed.

[0013] In some embodiments, the process parameters of the mixed powder cold spraying onto the surface of the metal substrate are as follows: the gas pressure is 0.5-1.0 MPa, the gas temperature is 100-150℃, and the powder feeding speed is 30-80 g / min.

[0014] In some embodiments, the temperature of the heat treatment on the deposited layer is 300-500℃, and the time is 1-2 h.

[0015] In some embodiments, the temperature of the heat treatment on the mixed coating layer after forming a preset shape is 500-600℃, and the time is 1-2 h.

[0016] In some embodiments, the alloy phase is a Ti2AlNb alloy phase.

[0017] The single-phase is a Ti single-phase, an Al single-phase, and a Nb single-phase.

[0018] In some embodiments, according to the mass ratio, the alloy phase in the mixed coating layer is 50%-80%, and the single-phase is 20%-50%.

[0019] In some embodiments, the average particle size of the Ti powder is 10-40 microns.

[0020] The average particle size of the Al powder is 10-50 microns.

[0021] The average particle size of the Nb powder is 5-30 microns.

[0022] In some embodiments, the thickness of the Ti2AlNb alloy coating layer is 3-5 millimeters.

[0023] In some embodiments, helium or nitrogen is used to cold spray the mixed powder onto the surface of the metal substrate.

[0024] In some embodiments, after the Ti2AlNb alloy coating layer is formed, the method further comprises:

[0025] The Ti2AlNb alloy coating layer is subjected to mechanical processing.

[0026] The technical scheme provided in the present application has the following beneficial effects:

[0027] The present application combines Ti2AlNb material with cold spraying, which is used for spraying additive manufacturing of workpieces, and can solve the shortcomings of poor plasticity, poor wear resistance, and difficult processing of single-element powder of Ti, Al, and Nb as coating material.

[0028] In addition, after cold spraying, the coating is subjected to an initial heat treatment, which causes an incomplete chemical reaction of the powder and partially forms a Ti2AlNb alloy phase. During the heating process, the internal atoms diffuse, and the structure formed by the Ti2AlNb and Ti, Al, and Nb elements in the coating reaches an equilibrium state, which increases the strength and toughness of the material. Mechanical processing on this basis has higher processing performance. Finally, a secondary heat treatment is performed to convert all the remaining element phases in the coating into an alloy phase to obtain a Ti2AlNb coating with excellent wear resistance. Compared with directly using Ti2AlNb material as a coating, the method of this application has stronger plasticity and further improves the performance of the workpiece. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0030] Figure 1 Flowchart of the cold spray additive manufacturing method for a metal substrate provided in an embodiment of the present application. DETAILED DESCRIPTION

[0031] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0032] See also Figure 1 As shown, the embodiment of the present application provides a cold spray additive manufacturing method for a metal substrate, comprising the following steps:

[0033] 101: Ti powder, Al powder and Nb powder are mixed in a molar ratio of 2:1:1 to obtain a mixed powder;

[0034] 102: cold spraying the mixed powder onto the surface of the metal substrate to form a deposition layer;

[0035] 103: heat treating the deposited layer to form a mixed coating including an alloy phase and a single phase;

[0036] 104: machining the mixed coating to form a preset shape;

[0037] 105: heat-treating the mixed coating layer after forming the preset shape, so that the single element phase is converted into an alloy phase to form a Ti2AlNb alloy coating layer.

[0038] The application uses the method of heating Ti, Al, and Nb element powders into Ti2AlNb, and the quality is proportioned according to the molecular formula. After cold spraying, the coating is subjected to primary heat treatment, so that the powders undergo incomplete chemical reaction, and part of the single element phase is converted into Ti2AlNb alloy phase. In the heating process, the internal atoms will diffuse, and the structure formed by Ti2AlNb and the single elements Ti, Al, and Nb in the coating reaches a balanced state, increasing the strength and toughness of the material. On this basis, mechanical processing has higher processing performance. Finally, secondary heat treatment is performed to convert the remaining single element phase in the coating into an alloy phase, thereby obtaining a Ti2AlNb coating layer with excellent wear resistance. The method of the application has stronger plasticity than directly using Ti2AlNb material as the coating, further improving the performance of the workpiece.

[0039] Specifically, the mechanical processing of the mixed coating layer to form a preset shape means that the mixed coating layer is roughly machined to preliminarily form a preset shape according to the intended setting. Since the mixed coating layer is in an intermediate state with a certain degree of alloying, the additive part is preliminarily processed into a preset shape, which has better processing performance, reduces processing difficulty, and improves additive quality.

[0040] After the preliminary formation of the preset shape, the coating is subjected to heat treatment to convert the remaining single element phase in the mixed coating layer into Ti2AlNb alloy phase, improve the wear resistance and strength of the coating, and finally perform mechanical fine processing on the coating, thereby obtaining the final product of the intended setting.

[0041] The method of the application is simple and easy to implement, which can reduce the processing difficulty of the additive coating layer while ensuring its plasticity and wear resistance, and is conducive to large-scale industrial production.

[0042] In some embodiments, the process parameters of the mixed powder cold spraying onto the metal substrate surface are: gas pressure of 0.5-1.0 MPa, gas temperature of 100-150°C, and powder feeding speed of 30-80 g / min.

[0043] The gas pressure is an important factor for the powder particles to reach the critical speed and obtain sufficient high energy. Low pressure is not conducive to the increase of the speed of the powder particles. Therefore, the application controls the gas pressure to be 0.5-1.0 MPa to ensure that the particles obtain supersonic speed, so that the particles are tightly combined with the metal substrate, and a dense coating is deposited.

[0044] The gas temperature has an important influence on the plastic deformation of the particles. Low temperature is prone to cause erosion or insufficient deformation, resulting in poor bonding or inclusion defects.

[0045] If the powder feeding speed is too low, the number of particles deposited on the substrate will be insufficient, which will reduce the deposition efficiency and may even cause coating defects due to insufficient particles. If the powder feeding speed is too high, it will easily cause airflow overload, which will easily lead to a decrease in the average particle velocity.

[0046] In some embodiments, the temperature of “heat-treating the deposited layer” is 300-500° C., and the time is 1-2 hours.

[0047] The purpose of this operation is to transform part of the elemental powder into Ti2AlNb alloy phase. By controlling the temperature and time of the heat treatment, the degree of alloying can be controlled so that the coating after the initial heat treatment has sufficient strength and toughness. Compared with the fully alloyed coating, this application uses a controlled specific intermediate state of alloying degree for mechanical processing, which has higher processing performance, thereby improving the quality of additive manufacturing.

[0048] If the heat treatment temperature is too low and the treatment time is too short, the degree of alloying will be too low, which may have a significant impact on the mechanical properties and corrosion resistance of the additive parts, and is not conducive to improving the processing performance; if the heat treatment temperature is too high and the treatment time is too long, it will have a significant impact on the mechanical properties of the additive parts, and is also not conducive to improving the processing performance.

[0049] In some embodiments, the temperature of “heat treating the mixed coating after forming the preset shape” is 500-600° C. and the time is 1-2 hours.

[0050] The purpose of this operation is to completely transform the remaining elemental phase in the mixed coating into the Ti2AlNb alloy phase, so that the coating has excellent wear resistance and strength. If the heat treatment temperature is too low or the treatment time is too short, the elemental phase cannot be completely transformed into the alloy phase, resulting in poor wear resistance and strength of the coating. If the heat treatment temperature is too high or the treatment time is too long, the alloy elements in the mixed coating will form a solid solution with the matrix metal elements, which will lead to grain growth, coarsening of the structure, and even the generation of a liquid phase, causing sintering. This will lead to a decrease in the mechanical properties of the additive, such as hardness, tensile strength, and elongation. Excessive heat treatment temperature and time will also change the chemical composition of the mixed coating. Excessive dissolution of the Al element in the Ti2AlNb alloy into the Ti matrix will cause changes in the crystal structure of the α phase and β phase, thereby reducing the mechanical properties of the additive, such as strength and plasticity.

[0051] In some embodiments, the alloy phase is a Ti2AlNb alloy phase;

[0052] The single phases are Ti single phase, Al single phase and Nb single phase.

[0053] The additive manufacturing method provided in the application can finally prepare a Ti2AlNb alloy coating by proportioning Ti powder, Al powder and Nb powder in a molar ratio of 2:1:1. Compared with elemental Ti coating or elemental Al coating or elemental Nb coating, the Ti2AlNb alloy coating provided in the application has more excellent plasticity, wear resistance and processability, and meets the industrialization requirements.

[0054] In some embodiments, the alloy phase in the mixed coating is 50% to 80% and the elemental phase is 20% to 50% by mass ratio.

[0055] By controlling the ratio of the alloy phase and the elemental phase, the alloying degree of the mixed coating is ensured to reach an ideal state, thereby improving the mechanical processing performance.

[0056] In some embodiments, the average particle size of the Ti powder is 10 to 40 microns.

[0057] The average particle size of the Al powder is 10 to 50 microns.

[0058] The average particle size of the Nb powder is 5 to 30 microns.

[0059] If the powder particle size is too large, it is difficult to accelerate and reach the critical speed required for cold spraying. If the powder particle size is too small, the particles accelerate too fast, which is not conducive to the deposition of particles and the improvement of coating quality.

[0060] In some embodiments, the thickness of the Ti2AlNb alloy coating is 3 to 5 millimeters.

[0061] In some embodiments, the mixed powder is cold sprayed onto the surface of the metal substrate by using helium or nitrogen.

[0062] In some embodiments, after the "forming Ti2AlNb alloy coating", it further includes:

[0063] Mechanical processing is performed on the Ti2AlNb alloy coating.

[0064] This operation aims to process the coating to form a final product with a preset shape.

[0065] The application will be further described below through specific embodiments.

[0066] Embodiment 1

[0067] The cold spraying additive manufacturing method of the metal substrate in this embodiment includes the following steps:

[0068] Step 1: Ti powder, Al powder and Nb powder are proportioned according to a molar ratio of 2:1:1, and then the proportioned powders are introduced into a spray gun nozzle, helium is added, and then sprayed out from the nozzle, the powders are driven by supersonic gas flow, and sprayed on the cavity surface layer of the metal substrate to form a deposition layer; wherein the parameters of cold spraying are as follows: gas pressure is 0.7 MPa, gas heating temperature is 120℃, and powder feeding speed is 50 g / min.

[0069] Step 2: The deposition layer is heat treated to convert part of the elemental powder into an alloy phase, wherein the temperature is 400℃ and the time is 1h.

[0070] Step 3: The additive part of the cavity surface is machined to the shape required by the finished workpiece.

[0071] Step 4: The machined additive part is subjected to a second heat treatment to convert the remaining elemental phase into an alloy phase, wherein the temperature is 550℃ and the time is 1h.

[0072] Step 5: The additive manufacturing coating after the second heat treatment is subjected to final machining to make the workpiece a finished product.

[0073] Example 2

[0074] The cold spraying additive manufacturing method of the metal substrate of the present embodiment comprises the following steps:

[0075] Step 1: Same as Example 1.

[0076] Step 2: The deposition layer is heat treated, wherein the temperature is 400℃ and the time is 0.5h.

[0077] Step 3: Same as Example 1.

[0078] Step 4: Same as Example 1.

[0079] Step 5: Same as Example 1.

[0080] Example 3

[0081] The cold spraying additive manufacturing method of the metal substrate of the present embodiment comprises the following steps:

[0082] Step 1: Same as Example 1.

[0083] Step 2: The deposition layer is heat treated, wherein the temperature is 400℃ and the time is 2.5h.

[0084] Step 3: Same as Example 1.

[0085] Step 4: Same as Example 1.

[0086] Step 5: Same as Example 1.

[0087] Example 4

[0088] The cold spray additive manufacturing method of the metal substrate of the present example comprises the following steps:

[0089] Step 1: same as Example 1.

[0090] Step 2: same as Example 1.

[0091] Step 3: same as Example 1.

[0092] Step 4: the processed additive part is subjected to a second heat treatment, wherein the temperature is 550°C and the time is 0.5h.

[0093] Step 5: same as Example 1.

[0094] Example 5

[0095] The cold spray additive manufacturing method of the metal substrate of the present example comprises the following steps:

[0096] Step 1: same as Example 1.

[0097] Step 2: same as Example 1.

[0098] Step 3: same as Example 1.

[0099] Step 4: the processed additive part is subjected to a second heat treatment, wherein the temperature is 550°C and the time is 2.5h.

[0100] Step 5: same as Example 1.

[0101] Comparative Example 1

[0102] The cold spray additive manufacturing method of the metal substrate of the present example comprises the following steps:

[0103] Step 1: Ti powder, Al powder and Nb powder are mixed in a molar ratio of 2:1:1, then the mixed powder is introduced into the nozzle of the spray gun, helium gas is added, and then sprayed from the nozzle, the powder is driven by supersonic gas flow, and sprayed on the surface layer of the cavity of the metal substrate to form a deposition layer; wherein the cold spray parameters are: gas pressure is 0.7MPa, gas heating temperature is 120°C, and powder feeding speed is 50g / min.

[0104] Step 2: the deposition layer is subjected to heat treatment, wherein the temperature is 500°C and the time is 2h, so that all the single-phase is converted into alloy phase.

[0105] Step 3: the additive part on the surface of the cavity is machined to make the workpiece a finished product.

[0106] Comparative Example 2

[0107] The cold spray additive manufacturing method of the metal substrate of the present comparative example comprises the following steps:

[0108] Step 1: Ti powder, Al powder and Nb powder are mixed in a molar ratio of 1:1:1, and then the mixed powder is introduced into the nozzle of a spray gun, helium gas is added, and then sprayed from the nozzle, the powder is driven by supersonic gas flow, and sprayed on the surface layer of the cavity of the metal substrate to form a deposition layer; wherein the cold spraying parameters are: gas pressure is 0.7 MPa, gas heating temperature is 120℃, and powder feeding speed is 50g / min.

[0109] Step 2: The deposition layer is heat treated to convert part of the elemental powder into alloy phase, wherein the temperature is 400℃ and the time is 1h.

[0110] Step 3: The additive part of the surface of the cavity is machined to the shape required by the finished workpiece.

[0111] Step 4: The machined additive part is subjected to a second heat treatment to convert the remaining elemental phase into an alloy phase, wherein the temperature is 550℃ and the time is 1h.

[0112] Step 5: The additive manufacturing coating after the second heat treatment is subjected to final processing to make the workpiece a finished product.

[0113] Performance test

[0114] The additive products manufactured in Examples 1-5 and Comparative Examples 1-2 are subjected to the following performance tests.

[0115] (1) Plasticity:

[0116] The plasticity test is performed according to GB / T228.1-2021 "Metallic Materials Tensile Test Part 1: Room Temperature Test Method".

[0117] (2) Wear resistance:

[0118] The wear resistance test is performed according to GB / T12444-2006 "Metallic Materials Wear Test Method Ring-Block Sliding Wear Test".

[0119] The test results are shown in Table 1.

[0120] Table 1

[0121]

[0122] From the plasticity data and wear resistance data of Table 1, compared with the results of Comparative Example 1 and Comparative Example 2, the plasticity and wear resistance of the additive can be improved by using the method of the present application, wherein the yield strength can reach 800 MPa, which is much higher than the 700 MPa of the comparative examples, the elongation rate reaches 13%, which is much higher than the 6% of the comparative examples, and the wear loss reaches 0.0001 g, which is much lower than the 0.0006 g of the comparative examples. It can be seen that by using the method of the present application, the elemental powders of Ti, Al and Nb are heated to become Ti2AlNb, the molar ratio is according to the molecular formula, the coating is cold sprayed and then subjected to primary heat treatment, so that the powders undergo incomplete chemical reaction and part of the elemental phases are converted into Ti2AlNb alloy phases. During the heating process, the atoms inside will diffuse, the structure formed by Ti2AlNb and the elemental phases of Ti, Al and Nb in the coating reaches a balance state, the strength and toughness of the material are increased, and the coating has higher machining performance. Finally, secondary heat treatment is performed to convert the remaining elemental phases in the coating into alloy phases, thereby obtaining a Ti2AlNb coating with excellent wear resistance. The plasticity of the coating obtained by the method of the present application is stronger than that of the coating directly using Ti2AlNb material, and the performance of the workpiece is further improved.

[0123] In combination with Example 1, Example 2 and Example 3, compared with the 1 h of heat treatment of the deposited layer in Example 1, the 0.5 h and 2.5 h of Example 2 and Example 3, respectively, the performance data is slightly worse than that of Example 1, but still better than that of Comparative Example 1 and Comparative Example 2. It can be seen that when the first heat treatment is performed, the heat treatment temperature is too low or the treatment time is too short, or the heat treatment temperature is too high and the treatment time is too long, which will greatly affect the mechanical properties and corrosion resistance of the additive, and is not conducive to the improvement of the machining performance.

[0124] In combination with Example 1, Example 4 and Example 5, compared with the 1 h of heat treatment of the additive in Example 1, the 0.5 h and 2.5 h of Example 2 and Example 3, respectively, the performance data is slightly worse than that of Example 1, but still better than that of Comparative Example 1 and Comparative Example 2. It can be seen that when the second heat treatment is performed, the heat treatment temperature is too low or the treatment time is too short, so that the elemental phases cannot be completely converted into alloy phases, resulting in poor wear resistance and strength of the coating; the heat treatment temperature is too high and the treatment time is too long, which will cause the alloy elements in the mixed coating to be dissolved with the base metal elements, and then cause the grain to grow and the structure to become coarse, and even cause liquid phase, thereby causing sintering phenomenon. This will cause the mechanical properties such as hardness, tensile strength and elongation of the additive to decrease. The high heat treatment temperature and time will also change the chemical composition in the mixed coating, and too much Al element in the Ti2AlNb alloy will dissolve into the Ti matrix, which will cause the crystal structure of the a phase and the β phase to change, thereby reducing the mechanical properties such as strength and plasticity of the additive.

[0125] In the description of the present application, it should be noted that the terms "upper", "lower", and the like are used to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. Unless otherwise expressly specified and limited, the terms "mounting", "connecting", "connecting" should be broadly understood, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0126] It should be noted that in the present application, relational terms such as "first" and "second" and the like are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that there is any such actual relationship or order between these entities or operations. Moreover, the terms "include", "contain" or any other variant thereof are intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or device. Without more limitations, the element defined by the sentence "including a" does not exclude the presence of other identical elements in the process, method, article or device including the element.

[0127] The above is only a specific embodiment of the present application, which enables those skilled in the art to understand or implement the present application. Various modifications of these embodiments will be apparent 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 application. Therefore, the present application will not be limited to these embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features applied herein.

Claims

1. A cold spray additive manufacturing method of a metal matrix, characterized by, The method comprises the following steps: Ti powder, Al powder and Nb powder are proportioned according to a molar ratio of 2:1:1 to obtain mixed powder; The mixed powder is cold sprayed onto the surface of a metal base to form a deposition layer; The deposition layer is subjected to heat treatment to cause the mixed powder contained in the deposition layer to undergo incomplete chemical reaction, thereby forming a mixed coating layer comprising alloy phase and elemental phase, the mixed coating layer being an additive part of the metal base, the temperature being 300-500 DEG C, and the time being 1-2 h; The mixed coating layer is subjected to mechanical processing to form a preset shape; The mixed coating layer after forming the preset shape is subjected to heat treatment to convert the elemental phase into alloy phase, thereby forming a Ti2AlNb alloy coating layer, the temperature being 500-600 DEG C, and the time being 1-2 h.

2. The cold spray additive manufacturing method of a metal matrix as claimed in claim 1, wherein, The process parameters of "cold spraying the mixed powder onto the surface of the metal base" are as follows: gas pressure is 0.5-1.0 MPa, gas temperature is 100-150 DEG C, and powder feeding speed is 30-80 g / min.

3. The cold spray additive manufacturing method of a metal matrix as claimed in claim 1, wherein, The alloy phase is Ti2AlNb alloy phase. The elemental phase is Ti elemental phase, Al elemental phase and Nb elemental phase.

4. The cold spray additive manufacturing method of a metal matrix as claimed in claim 1, wherein, According to the mass ratio, the alloy phase in the mixed coating layer is 50%-80%, and the elemental phase is 20%-50%.

5. The cold spray additive manufacturing method of a metal matrix as claimed in claim 1, wherein, The average particle size of the Ti powder is 10-40 microns. The average particle size of the Al powder is 10-50 microns. The average particle size of the Nb powder is 5-30 microns.

6. The cold spray additive manufacturing method of a metal matrix as claimed in claim 1, wherein, The thickness of the Ti2AlNb alloy coating layer is 3-5 mm.

7. The cold spray additive manufacturing method of a metal matrix as claimed in claim 1, wherein, Helium or nitrogen is used to cold spray the mixed powder onto the surface of the metal base.

8. The cold spray additive manufacturing method of a metal matrix as claimed in claim 1, wherein, After "forming the Ti2AlNb alloy coating layer", the following steps are further included: The Ti2AlNb alloy coating layer is subjected to mechanical processing.

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