Preparation method of titanium-aluminum ceramic alloy material-structure double-gradient functional part

Abstract

According to the preparation method of the titanium-aluminum ceramic alloy material-structure double-gradient functional part, a material-structure double-gradient model is established on the basis of preset material components and sizes, a titanium-aluminum alloy layer and an aluminum ceramic layer are designed, the titanium-aluminum alloy layer comprises a plurality of titanium-aluminum alloy sub-layers, and the aluminum ceramic layer comprises a plurality of titanium-aluminum alloy sub-layers; in the direction from the titanium-aluminum alloy layer to the aluminum ceramic layer of each titanium-aluminum alloy sub-layer, the content of titanium in each layer is reduced layer by layer, so that the inner high titanium alloy end is continuously transited to the middle titanium-aluminum alloy layer and finally to a gradient structure model of the surface aluminum ceramic layer; converting the CAD model into an STL model based on a curved surface layering slicing method, importing the STL model into software of magnetic control double-arc additive equipment, starting the equipment, melting titanium / aluminum welding wires, depositing parts layer by layer, adjusting the wire feeding speed between layers, and adding alloy powder to change interlayer components until the last layer; the finally formed titanium / aluminum / ceramic alloy material-structure double-gradient functional part not only has the titanium alloy layer with good biocompatibility, but also has the middle layer with high specific strength and good thermal conductivity and creep resistance, and also has the properties of heat resistance, high-temperature oxidation resistance and the like, and meanwhile, the overall weight of the functional part is effectively reduced and the shock resistance is improved through the middle curved surface dotted structure.

Description

Technical Field

[0001] The present invention relates to the technical field of composite materials and processing thereof, and more specifically, to a metal material-structure substrate functional part and an additive processing preparation method thereof. Background Art

[0002] Titanium and titanium alloys have the advantages of low density, high specific strength, excellent corrosion resistance and plasticity, good high temperature stability and good biocompatibility. Therefore, titanium alloy parts are usually used in harsh environments with high temperature, high pressure and strong corrosion, and even different functional requirements are put forward for different parts of titanium alloy parts.

[0003] At present, the preparation methods of functional materials include plasma spraying, vapor deposition, self-propagating high temperature synthesis, powder metallurgy, centrifugal casting, pressure infiltration, laser cladding, etc. However, these methods for preparing gradient materials all have disadvantages to varying degrees, such as high porosity, low interlayer bonding strength, high preparation energy consumption, and the inability to continuously and smoothly distribute components.

[0004] The present invention discloses a method for preparing titanium-aluminum ceramic alloy by using a magnetron double arc additive manufacturing process. A process combining composite additive manufacturing technology with titanium-aluminum ceramic alloy material modification, and improving the organization and regulating the composition by in-situ adding alloy powder between layers, and improving the interlayer combined force by regulating the magnetic field intensity and arc parameters, and finally obtaining a TiAl-based alloy gradient functional material with superior performance by means of a magnetic field / arc composite field and post-processing process. Summary of the invention

[0005] The present invention provides a method for preparing a titanium-aluminum ceramic alloy material-structure dual-gradient functional component to solve the above-mentioned technical problems.

[0006] According to one aspect of the present invention, a titanium-aluminum ceramic alloy material-structure dual-gradient functional part is provided, which comprises a high titanium alloy (inner) layer, a titanium-aluminum alloy (middle) layer and an aluminum ceramic (outer) layer, wherein the aluminum ceramic (outer) layer is deposited on the titanium-aluminum alloy layer, and the titanium-aluminum ceramic alloy layer is deposited on the titanium alloy (inner) layer; the titanium-aluminum ceramic alloy layer comprises a plurality of titanium-aluminum ceramic alloy sublayers, and each of the titanium-aluminum ceramic alloy sublayers increases aluminum content layer by layer and decreases titanium content layer by layer in the direction from the high titanium alloy layer to the aluminum ceramic layer.

[0007] Preferably, based on the above scheme, the dense corrosion-resistant aluminum ceramic (outer or S3) layer includes multiple aluminum ceramic sub-layers, and along the inner layer in the direction away from the titanium aluminum ceramic alloy layer (outer or S3), the aluminum oxide content of each aluminum ceramic sub-layer increases layer by layer, and the aluminum content of each aluminum ceramic sub-layer decreases layer by layer.

[0008] Preferably, based on the above scheme, the aluminum-ceramic sublayer includes a first aluminum-ceramic layer, a second aluminum-ceramic layer and a third aluminum-ceramic layer, in terms of mass percentage: the composition of the first aluminum-ceramic layer includes 90% aluminum + (5% aluminum oxide and 5% alloy powder), the composition of the second aluminum-ceramic layer includes 85% aluminum + (10% aluminum oxide and 5% alloy powder), the composition of the third aluminum-ceramic layer includes 80% aluminum and + (15% aluminum oxide and 5% alloy powder), after the N-1th additive layer is formed, a layer of 5% alloy powder is evenly spread, and then the Nth additive layer is formed.

[0009] Preferably, based on the above scheme, the titanium-aluminum ceramic alloy sublayer includes a first titanium-aluminum layer, a second titanium-aluminum layer and a third titanium-aluminum layer, and in terms of mass percentage: the first titanium-aluminum layer includes 70% Ti+ (25% Al and 5% alloy powder); the second titanium-aluminum layer includes 60% Ti+ (35% Al and 5% alloy powder), and the third titanium-aluminum layer includes 30% Ti+ (65% Al and 5% alloy powder). After the N-1th additive layer is formed, a layer of 5% alloy powder is evenly spread, and then the Nth additive layer is formed.

[0010] Preferably, based on the above scheme, the titanium alloy (inner or S1) layer is at least two layers, and the thickness of each titanium alloy layer is 0.2 to 0.8 mm. The substrate adopts TC4, and 5% TiN alloy powder is evenly spread between each additive layer before the secondary additive layer is formed; the titanium aluminum alloy sublayer and the aluminum ceramic sublayer are respectively composed of multiple sublayers.

[0011] Preferably, based on the above scheme, the in-situ alloy powder is selected from 1 to 2 of the first main alloy powder Al2O3, TiN, SiC, and La2O3, and the second auxiliary metal powder is 1 to 4 of V, Cr, Mn, Co, Ni, Cu, Zn, Nb, Mo, W, Sn, Si, and B, and the main alloy powders of the two sets of mixed powders in the front layer and the rear wire are not exactly the same, and the auxiliary powders are the same and account for 5% by mass.

[0012] The present invention also provides a method for preparing a titanium-aluminum ceramic alloy material-structure dual-gradient functional component, comprising the following steps:

[0013] Step a. Based on the preset material composition and size, a gradient functional material structure additive model is established, and the additive processing three-dimensional model is imported into the magnetically controlled double arc additive manufacturing system, which has been separately applied for an invention patent;

[0014] Step b. Loading pure aluminum and pure titanium wires in the dual welding guns respectively, and loading the alloy powder into the powder laying system;

[0015] Step c. Based on the additive processing titanium aluminum ceramic alloy material-structure dual gradient functional component model, according to the titanium aluminum wire in the melting welding gun, the N-1 additive layer is formed, a layer of alloy powder is evenly spread, and then the N additive layer is formed. Until the dual gradient functional component is obtained on the substrate.

[0016] Preferably, on the basis of the above scheme, the step c further includes in detail: based on the additive machining three-dimensional model, the pure titanium aluminum wire in the melting welding gun is used to sequentially form the high titanium alloy (inner or S1) layer, the titanium aluminum alloy (middle or S2) layer and the aluminum ceramic (outer or S1) layer on the substrate, and the titanium alloy layer, the titanium aluminum ceramic alloy layer and the aluminum ceramic layer are in a double moving electromagnetic field space during the formation process.

[0017] Preferably, based on the above scheme, the excitation current of the electromagnetic field is 2.5-15A, and the excitation frequency of the electromagnetic field is 2-15Hz.

[0018] Preferably, based on the above scheme, in the mass percentage control of the titanium-aluminum ceramic alloy layer, the mass percentages of titanium and aluminum are controlled by adjusting the wire feeding speed, and other alloy components are controlled by melting alloy powders of different proportions added in situ between additive layers.

[0019] Preferably, based on the above scheme, before step c, it also includes powdering titanium nitride, titanium carbide and aluminum oxide alloy powders based on a gas atomization powder making method, and mechanically mixing them according to the ratio to obtain aluminum oxide alloy powder, titanium carbide alloy powder and alloy powder series; the operation of step c is under argon protection, and the substrate is a TC4 plate; and between step c and step b, it also includes preheating the substrate, and the preheating temperature is 300-400°C, and the interlayer temperature is controlled at 500-550°C.

[0020] The present invention provides a method for preparing a titanium-aluminum ceramic alloy material-structure dual-gradient functional part. By designing a high titanium alloy layer, a titanium-aluminum alloy layer and an aluminum ceramic layer, the titanium-aluminum alloy layer includes a plurality of titanium-aluminum alloy sublayers, and each titanium-aluminum alloy sublayer has an aluminum content that increases layer by layer and a titanium content that decreases layer by layer in the direction from the titanium alloy layer to the aluminum ceramic layer, so that the titanium alloy end continuously transitions to the titanium-aluminum alloy layer and finally to the aluminum ceramic layer, so that the finally formed titanium-aluminum ceramic alloy material-structure dual-gradient functional part has the excellent properties of titanium alloy, such as excellent high-temperature oxidation resistance and creep resistance, good thermal conductivity and light weight, and also has the good heat resistance, wear resistance, high mechanical strength and other properties of ceramics. At the same time, the curved surface (such as a honeycomb structure or other point-like) structure between the intermediate transition layers further effectively reduces its overall weight and improves its shock resistance.

[0021] Due to the titanium-aluminum ceramic alloy material-structure dual-gradient functional part of the present invention, the aluminum content of each titanium-aluminum ceramic alloy sublayer increases layer by layer and the titanium content decreases layer by layer in the direction from the high titanium alloy (inner or S1) layer to the aluminum ceramic (outer or S1) layer, and the aluminum content of each aluminum ceramic sublayer decreases layer by layer and the aluminum oxide content increases layer by layer along the direction away from the titanium-aluminum ceramic alloy (middle or S2) layer, and the titanium-aluminum alloy sublayer and the aluminum ceramic sublayer are both composed of multiple sublayers. Therefore, the components in the overall material are continuously changed, which can effectively eliminate the macroscopic interface stress in the material and effectively prevent delamination.

[0022] The titanium content is measured by mass percentage, gradually decreasing from the inner layer (90%) to the titanium-aluminum alloy transition (middle) layer (30%) accumulation layer and then to the outer (0%) layer. The aluminum content gradually increases from the inner layer (0%) to the titanium-aluminum alloy transition (middle) layer (70%), and the aluminum oxide content of the aluminum ceramic (outer or S3) layer gradually increases. The remaining components are the components of the 5% deposited alloy powder added in situ between layers. The specific operation steps are to reset the relative wire feeding speed of the titanium and aluminum wires every time the arc melts and deposits a layer of metal to ensure that the titanium content gradually decreases from the inner layer to the outer layer, and the aluminum content gradually increases. According to the results of energy spectrum monitoring, as the height of the accumulation layer increases, the titanium-aluminum content changes continuously in steps to reach the set composition to be qualified. The content and composition of the alloy powder added in situ between layers can be the same or different, because when the Nth accumulation layer is deposited during the arc additive manufacturing process, the N-1th deposition layer will also be partially melted. Therefore, the content of titanium, aluminum, ceramics and other alloys in the final metal component changes relatively continuously, and the alloy powder is evenly distributed.

[0023] A titanium-aluminum ceramic alloy material-structure dual-gradient functional part preparation method of the present invention, the equipment used is a magnetically controlled double arc additive processing equipment, the spacing between the first magnetically controlled double welding gun and the second magnetically controlled double welding gun can be adjusted by a spacing slide bar to optimize the double wire spacing and the magnetic field spacing, the double welding gun can be equipped with the same welding wire or with different metal welding wires, and the powder spreading device can add alloy powder between layers to achieve the integrated overall forming of the same or different metal structures-materials. The double arcs can be started simultaneously or separately, and the process parameters of the arcs are controllable and adjustable; the magnetic field controller adjusts the magnetic field parameters to optimize the arc, stir the molten pool, increase the melting depth, refine the grains, and improve the interface bonding stress; the gas circuit controller adjusts the inert gas supply to provide a protective gas hood in the additive manufacturing process, and isolates the environment to prevent oxidation to the maximum extent. The equipment is very convenient to form a material-structure dual-gradient functional part with continuously changing intermediate components on the substrate as a whole, and its forming efficiency is high and the cost is low, and the uniformity of the interface layer thickness is controllable and the alloying effect is good. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1The process flow chart of the titanium-aluminum ceramic alloy material-structure dual-gradient functional part of the present invention;

[0025] Figure 2 A schematic diagram of the structure of the titanium-aluminum ceramic alloy material-structure dual-gradient functional component of the present invention;

[0026] Figure 3 It is a simplified structural diagram of the magnetically controlled double arc additive processing equipment of the present invention.

[0027] In the figure, 100. the first double welding gun, 200. the second double welding gun, 1. wire feeding device, 2. protective gas circuit, 3. gas circuit controller, 4. welding wire, 5. magnetic field generating device, 6. magnetic field controller, 7. arc controller, 8. four-axis linkage system, 9. powder spreading control system, 10. powder spreading lifting platform, 12. powder spreading system, 13. electromagnetic protection cover, 14. substrate, 15. rod-shaped magnetic head, 16. ventilation ring, 20. dissimilar metal layer, 21. molten droplet. DETAILED DESCRIPTION

[0028] The specific implementation of the present invention is further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0029] See also Figure 2 As shown, the present invention provides a titanium-aluminum ceramic alloy material-structure dual gradient functional part, including a high titanium alloy (inner or S1) layer, a titanium-aluminum alloy (middle or S2) layer and an aluminum ceramic (outer or S3) layer, wherein the aluminum ceramic (outer or S3) layer is deposited on the titanium-aluminum alloy layer, and the titanium-aluminum ceramic alloy layer is deposited on the high titanium alloy (inner or S1) layer; the titanium-aluminum alloy layer includes a plurality of titanium-aluminum ceramic alloy sublayers, and each of the titanium-aluminum alloy sublayers has an aluminum content that increases layer by layer and a titanium content that decreases layer by layer in a direction from the high titanium alloy layer to the aluminum ceramic layer.

[0030] The present invention discloses a method for preparing a titanium-aluminum ceramic alloy material-structure dual gradient functional part. By designing a high titanium alloy layer, a titanium-aluminum alloy layer and an aluminum ceramic layer, the titanium-aluminum alloy layer includes a plurality of titanium-aluminum alloy sublayers. In each alloy sublayer, the aluminum content of each layer increases layer by layer, and the titanium content decreases layer by layer in the direction from the high titanium alloy layer to the titanium-aluminum alloy layer and the aluminum ceramic layer, so that the titanium alloy end continuously transitions to the titanium-aluminum alloy layer and finally to the aluminum ceramic layer, so that the finally formed material-structure dual gradient functional part has the excellent properties of the titanium alloy inner layer being corrosion resistance, good thermal conductivity and good biocompatibility, and the aluminum ceramic outer layer being heat resistance, high temperature resistance, high mechanical strength and high temperature oxidation resistance. The titanium-aluminum alloy intermediate transition layer is composed of a curved surface (such as a honeycomb structure or other point-like) structure, which further effectively reduces its overall weight and improves its shock resistance.

[0031] Due to the titanium-aluminum ceramic alloy material-structure dual-gradient functional part of the present invention, the aluminum content of each titanium-aluminum ceramic alloy sublayer increases layer by layer and the titanium content decreases layer by layer in the direction from the high titanium alloy (inner or S1) layer to the aluminum ceramic (outer or S1) layer, and the aluminum content of each aluminum ceramic sublayer decreases layer by layer in the direction away from the titanium-aluminum ceramic alloy (middle or S2) layer, and the aluminum oxide content of each aluminum ceramic sublayer increases layer by layer, and the titanium-aluminum alloy sublayer and the aluminum ceramic sublayer are both composed of multiple sublayers. Therefore, the components in the overall material are continuously changed, which can effectively eliminate the macroscopic interface and stress in the material and effectively prevent delamination.

[0032] As a preferred embodiment of the present invention, the high titanium alloy (inner or S1) layer is at least two layers, and the thickness of each layer is 0.2 to 0.8 mm. The substrate adopts TC4, and 5% alloy powder is evenly spread between each N-1 additive layer before the N-th additive layer molding. During the processing, the layer thickness can be controlled by adjusting the dual magnetic field and arc process parameters to obtain the optimal interlayer bonding and eliminate adverse interface effects such as composite material cross-sectional stress.

[0033] Preferably, the titanium-aluminum ceramic alloy sublayer of the present invention comprises a first titanium-aluminum alloy layer, a second titanium-aluminum alloy layer and a third titanium-aluminum alloy layer, and in terms of mass percentage: the composition of the first titanium-aluminum alloy layer comprises 70% titanium + (25% aluminum and 5% alloy powder); the second titanium-aluminum alloy layer comprises 60% titanium + (35% aluminum and 5% alloy powder), and the third titanium-aluminum alloy layer comprises 30% titanium + (65% aluminum and 5% alloy powder). The aluminum ceramic sublayer of the present invention includes a first aluminum ceramic layer, a second aluminum ceramic layer and a third aluminum ceramic layer, and in terms of mass percentage: the composition of the first aluminum ceramic layer includes 80% aluminum + (15% aluminum oxide and 5% alloy powder), the composition of the second aluminum ceramic layer includes 75% aluminum + (20% aluminum oxide and 5% alloy powder), and the composition of the third aluminum ceramic layer includes 70% aluminum + (25% aluminum oxide and 5% alloy powder). Through the above structure, the composition transition inside the high titanium alloy layer, inside the titanium aluminum alloy, inside the aluminum ceramic layer, between the high aluminum alloy layer and the titanium aluminum alloy layer, and between the titanium aluminum alloy layer and the aluminum ceramic layer is more continuous and smooth, and the in-situ addition of alloy powder between the layers effectively reduces the delamination phenomenon inside and between the three. Preferably, the titanium alloy layer includes 2 layers, the titanium aluminum alloy sublayer and the aluminum ceramic sublayer can be composed of multiple sublayers, and the titanium aluminum alloy sublayer interlayer curved surface (such as a honeycomb structure or other point-like) structure, the high titanium alloy layer and the aluminum ceramic layer become a dense structure.

[0034] See also Figure 1As shown, based on the above scheme, it is preferred that the alloy powder is selected from 1 to 2 of the first main alloy powder Al2O3, TiN, SiC, and La2O3, and the second auxiliary metal powder is 1 to 4 of V, Cr, Mn, Co, Ni, Cu, Zn, Nb, Mo, W, Sn, Si, and B, and the main alloy powders of the two sets of mixed powders in the front layer and the rear wire are not exactly the same, and the auxiliary powders are the same and account for 5% by mass.

[0035] The present invention also provides a method for preparing a titanium-aluminum ceramic alloy material-structure dual-gradient functional component, comprising the following steps:

[0036] Step a. Based on the pre-set material type and size, a gradient functional material structure additive model is established, and the additive processing three-dimensional model is imported into the magnetic control double arc additive manufacturing system (the system has been separately applied for an invention patent);

[0037] Step b. Loading pure aluminum and pure titanium wires in the dual welding guns respectively, and loading the alloy powder into the powder laying system;

[0038] Step c. Based on the additive processing titanium aluminum ceramic alloy material-structure dual gradient functional component model, melt the titanium aluminum wire in the welding gun, form the Nth to 1st additive layers, evenly spread a layer of alloy powder, and then form the Nth additive layer, until the dual gradient functional component is obtained on the substrate.

[0039] Preferably, on the basis of the above scheme, the step c further comprises in detail: based on the additive machining three-dimensional model, the pure titanium-aluminum metal wire in the welding gun is melted to sequentially form the titanium alloy (inner or S1) layer, the titanium-aluminum ceramic alloy (middle or S2) layer and the aluminum ceramic (outer or S1) layer on the substrate, and the titanium alloy layer, the titanium-aluminum alloy layer and the aluminum ceramic layer are in a mobile electromagnetic field space during the formation process.

[0040] Preferably, based on the above scheme, the excitation current of the dual electromagnetic field is 2.5-15A, and the excitation frequency of the electromagnetic field is 2-15Hz.

[0041] Preferably, based on the above scheme, in the mass percentage control of the titanium-aluminum ceramic alloy layer, the mass percentages of titanium and aluminum are controlled by adjusting the wire feeding speed, and other alloy components are controlled by in-situ adding alloy powders of different proportions between additive layers.

[0042] Preferably, based on the above scheme, before step c, it also includes powdering titanium nitride, titanium carbide and aluminum oxide alloy powders based on a gas atomization powder making method, and mechanically mixing them according to the ratio to obtain aluminum oxide alloy powder, titanium carbide alloy powder and alloy powder series; the operation of step c is under argon protection, and the substrate is a TC4 plate; and between step c and step b, it also includes preheating the substrate, and the preheating temperature is 300-400°C, and the interlayer temperature is controlled at 500-550°C.

[0043] During the processing, in order to avoid surface rust and affect product performance, the TC4 plate needs to be polished before the first layer is formed. After polishing, it is preheated. The deposition speed is 100-350 mm / min and the wire feeding speed is 1-5 m / min.

[0044] Before step a, the process also includes powdering alloy powder, titanium nitride, titanium carbide and aluminum oxide based on gas atomization powder making method, and mechanically mixing them according to the proportions to obtain aluminum oxide series alloy powder, titanium carbide series alloy powder and alloy powder series respectively; the alloy powder is spherical or quasi-spherical, and the powder particle size distribution is 15-40 μm to ensure good fluidity and filling of the powder, the oxygen content is less than 700 ppm, and the diameter of pure titanium and pure aluminum wire is controlled at 0.6-1.6 mm. Preferably, the medium used in the gas atomization powder making method is argon.

[0045] In order to obtain independent material-structure dual gradient functional parts, the present invention needs to separate the formed parts from the substrate using a wire cutting process.

[0046] In order to further improve the physical, chemical, mechanical properties and fatigue resistance of the functional area, the present invention also needs to subject the obtained independent metal substrate functional parts to corresponding annealing, hot isostatic pressing strengthening treatment and artificial aging and other heat treatments. Preferably, the annealing temperature is 350°C to 450°C, and the annealing time is 3 to 5 hours. And after annealing, the parts are subjected to hot isostatic pressing strengthening and aging treatment, wherein the hot isostatic pressing temperature is set at 800 to 850°C, the pressure is set at 100MPa, and the time is set at 24h. After hot isostatic pressing, aging treatment is performed, the temperature is set at 150 to 200°C, and the time is set at 25 to 40 hours.

[0047] After completing the above-mentioned strengthening heat treatment, it is necessary to conduct physical, chemical and mechanical tests on the parts at a temperature of 650°C to clarify the physical, chemical and high-temperature fatigue resistance of functional parts under additive manufacturing technology in a high-temperature environment.

[0048] The present invention discloses a method for preparing a titanium-aluminum ceramic alloy material-structure dual gradient functional part. By designing a high titanium alloy layer, a titanium-aluminum alloy layer and an aluminum ceramic layer, the titanium-aluminum alloy layer includes a plurality of titanium-aluminum alloy sublayers, and each alloy sublayer has an aluminum content that increases layer by layer and a titanium content that decreases layer by layer in the direction from the titanium alloy layer to the titanium-aluminum alloy layer and the aluminum ceramic layer, so that the high titanium alloy end continuously transitions to the titanium-aluminum alloy layer and finally to the aluminum ceramic layer, so that the finally formed material-structure dual gradient functional part has excellent properties such as corrosion resistance, good thermal conductivity and good biocompatibility of the high titanium alloy inner layer, and heat resistance, high temperature resistance, high mechanical strength and high temperature oxidation resistance of the aluminum ceramic outer layer. The titanium-aluminum alloy intermediate transition layer has a curved surface (such as a honeycomb structure or other point-like) structure, which further effectively reduces its overall weight and improves its shock resistance.

[0049] Due to the titanium-aluminum ceramic alloy material-structure dual-gradient functional part of the present invention, the aluminum content of each titanium-aluminum ceramic alloy sublayer increases layer by layer and the titanium content decreases layer by layer in the direction from the titanium alloy (inner or S1) layer to the aluminum ceramic (outer or S1) layer, and the aluminum content of each aluminum ceramic sublayer decreases layer by layer in the direction away from the titanium-aluminum ceramic alloy (middle or S2) layer, and the aluminum oxide content of each aluminum ceramic sublayer increases layer by layer, and the titanium-aluminum alloy sublayer and the aluminum ceramic sublayer are both composed of multiple sublayers. Therefore, the components in the overall material are continuously changed, which can effectively eliminate the macroscopic interface in the material and effectively prevent delamination.

[0050] The present invention adopts Figure 3 The magnetically controlled dual arc additive manufacturing system shown is used to prepare a titanium-aluminum ceramic alloy material-structure dual gradient functional part of the present invention. The manufacturing system uses a dual welding gun carrying a dual magnetic field generator. The dual welding gun can slide in the spacing adjustment chute to adjust the distance between the two arc guns. The distance between the two welding wires can be controlled to adjust the manufacturing process. Through the optimal distance control, stable arc process parameters are achieved. The temperature meter is fixed in the middle of the spacing adjustment chute to collect the temperature during the additive process. The use of the composite magnetically controlled dual arc greatly improves the additive forming efficiency. At the same time, the dual welding gun can realize the direct manufacturing of heterogeneous materials by clamping different metal wires, so that the composition can be adjusted. The external magnetic field constrains the arc. The magnetic field device is used to control the droplet size and improve the micro-molten pool structure, reduce the interface bonding stress, and improve the forming accuracy. The lifting workbench is provided with a cooler and a heater to achieve heating and cooling during the forming process. At the same time, after a layer of metal wire is melted in the system additive path, the four-axis motion system drives the welding gun to rise by one layer height to provide space for the secondary additive layer until the deposition of all layers is completed. During this period, the powder laying system rises to the corresponding layer height according to the design requirements and lays a layer of alloy powder, which is then melted by the fuse layer. This system is an efficient device suitable for the overall manufacturing of metal material-structure dual gradient functional structures.

[0051] The method of this application is only a preferred implementation scheme and is not intended to limit the protection scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for preparing a titanium-aluminum ceramic alloy material-structure dual-gradient functional component, characterized in that: It includes a titanium alloy (inner) layer, a titanium aluminum alloy (middle) layer and an aluminum ceramic (outer) layer, wherein the aluminum ceramic (outer) layer is deposited on the titanium aluminum alloy layer, and the titanium aluminum alloy layer is deposited on the high titanium alloy (inner) layer; the titanium aluminum alloy layer includes a plurality of titanium aluminum ceramic alloy sublayers, and each of the titanium aluminum ceramic alloy sublayers has an aluminum content that increases layer by layer and a titanium content that decreases layer by layer in a direction from the titanium alloy layer to the aluminum ceramic layer.

2. The titanium-aluminum ceramic alloy material-structure dual gradient functional component according to claim 1, characterized in that: The dense corrosion-resistant aluminum ceramic layer includes multiple aluminum ceramic sub-layers, and along the direction away from the titanium aluminum ceramic alloy layer (outward), the aluminum oxide content of each aluminum ceramic sub-layer increases layer by layer, the aluminum content of each aluminum ceramic sub-layer decreases layer by layer, and the ceramic content increases layer by layer.

3. A titanium-aluminum ceramic alloy material-structure dual gradient functional component as claimed in claim 2, characterized in that: The aluminum-ceramic sublayer includes a first aluminum-ceramic layer, a second aluminum-ceramic layer and a third aluminum-ceramic layer. In terms of mass percentage, the first aluminum-ceramic layer includes 90% aluminum + (5% aluminum oxide and 5% alloy powder), the second aluminum-ceramic layer includes 85% aluminum + (10% aluminum oxide and 5% alloy powder), and the third aluminum-ceramic layer includes 80% aluminum + (15% aluminum oxide and 5% alloy powder). After the N-1th additive layer is formed, a layer of 5% alloy powder is evenly spread, and then the Nth additive layer is formed.

4. A titanium-aluminum ceramic alloy material-structure dual gradient functional component as claimed in claim 1, characterized in that: The titanium-aluminum ceramic alloy sublayer includes a first titanium-aluminum layer, a second titanium-aluminum layer and a third titanium-aluminum layer. In terms of mass percentage, the first titanium-aluminum alloy layer includes 70% Ti+ (25% Al and 5% alloy powder); the second titanium-aluminum layer includes 60% Ti+ (35% Al and 5% alloy powder), and the third titanium-aluminum layer includes 30% Ti+ (65% Al and 5% alloy powder). After the N-1th additive layer is formed, a layer of 5% alloy powder is evenly spread, and then the Nth additive layer is formed.

5. The titanium-aluminum ceramic alloy material-structure dual gradient functional component according to claim 1, characterized in that: The titanium alloy (inner or S1) layer is at least two layers, and the thickness of each high titanium alloy layer is 0.2 to 0.8 mm. The substrate adopts TC4 plate. 5% TiN alloy powder is evenly spread between each additive layer and then the secondary additive layer is formed. The titanium aluminum alloy sublayer and the aluminum ceramic sublayer are respectively composed of multiple sublayers.

6. A method for preparing a titanium-aluminum ceramic alloy material-structure dual gradient functional component according to claim 1, characterized in that: The alloy powder is selected from 1 to 2 of the first main alloy powder Al2O3, TiN, SiC, and La2O3, and the second auxiliary metal powder is 1 to 4 of V, Cr, Mn, Co, Ni, Cu, Zn, Nb, Mo, W, Sn, Si, and B. The main alloy powders of the two sets of mixed powders in the front layer and the back wire are not completely the same, and the auxiliary powders are the same and account for 5% by mass. In the mass percentage control of the titanium-aluminum ceramic alloy layer, the mass percentages of titanium and aluminum are controlled by adjusting the wire feeding speed, and other alloy components are controlled by adding alloy powders of different proportions between the additive layers.

7. A method for preparing a titanium-aluminum ceramic alloy material-structure dual gradient functional component as claimed in claim 1, characterized in that: The following steps are included: Step a. Based on the preset material composition and size, a gradient functional material structure additive model is established, and the additive processing three-dimensional model is imported into a magnetically controlled double arc additive manufacturing system (the system has been separately applied for an invention patent); Step b. Loading pure aluminum and pure titanium wires in the dual welding guns respectively, and loading the alloy powder into the powder laying system; Step c. Based on the additive processing titanium-aluminum ceramic alloy material-structure dual gradient functional component model, the titanium-aluminum metal wire in the welding gun is melted, and after the N-1th additive layer is formed, a layer of 5% alloy powder is evenly spread, and then the Nth additive layer is formed. Until the material-structure dual gradient functional component is obtained on the substrate.

8. A method for preparing a titanium-aluminum ceramic alloy material-structure dual gradient functional component as claimed in claim 6, characterized in that: The step c further includes, based on the additive machining three-dimensional model, melting the pure titanium aluminum wire in the welding gun, sequentially forming the titanium alloy (inner or S1) layer, the titanium aluminum alloy (middle or S2) layer and the aluminum ceramic (upper or S3) layer on the substrate, and the titanium alloy layer, the titanium aluminum ceramic alloy layer and the aluminum ceramic layer are in a double moving electromagnetic field space during the formation process.

9. A method for preparing a titanium-aluminum ceramic alloy material-structure dual gradient functional component as claimed in claim 7, characterized in that: The excitation current of the dual electromagnetic field is 2.5-15A, and the excitation frequency of the dual electromagnetic field is 2-15Hz.

10. A method for preparing a titanium-aluminum ceramic alloy material-structure dual gradient functional component as claimed in claim 9, characterized in that: The step before step a also includes powdering titanium nitride, titanium carbide and aluminum oxide alloy powders based on a gas atomization powder making method, and mechanically mixing them according to the proportions to obtain aluminum oxide series alloy powders, titanium carbide series alloy powders and other alloy powder series respectively; the step c operation is under argon protection, and the substrate is a deformed TC4 plate; and between step c and step b, the substrate is preheated and the interlayer temperature is controlled, and the preheating temperature is 300-400°C, and the interlayer temperature is controlled at 500-550°C.

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