CN112719272A - Method for manufacturing high-entropy alloy gear through additive manufacturing - Google Patents
Method for manufacturing high-entropy alloy gear through additive manufacturing Download PDFInfo
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- B22F5/00—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
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- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
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- B22F9/00—Making metallic powder or suspensions thereof
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- B33Y10/00—Processes of additive manufacturing
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- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
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- C22C32/0047—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ with carbides, nitrides, borides or silicides as the main non-metallic constituents
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- B22F9/00—Making metallic powder or suspensions thereof
- B22F9/02—Making metallic powder or suspensions thereof using physical processes
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Abstract
The invention discloses a method for manufacturing a gear by adopting layer-by-layer 3D printing high-entropy alloy, which is formed by Ti capable of generating exothermic reaction3AlC2After ball milling of mixed powder (precursor) and various metal powder capable of generating high-entropy alloy in sequencePreparing mixed powder, and melting into Ti-containing powder in protective atmosphere by scanning layer by laser line3AlC2High entropy alloy gears of compounds in which Ti3AlC2The precursor is ignited by laser to generate exothermic reaction in a small range to form Ti3AlC2The compound is in a layered structure, has high hardness and metal characteristics, and has certain lubricating property, so that the manufactured high-entropy alloy gear has the advantages of good high-temperature property, good wear resistance, friction reduction and the like.
Description
Technical Field
The invention belongs to the field of additive manufacturing by selective laser melting, and mainly relates to a method for manufacturing a high-entropy alloy gear with a self-lubricating function by melting a metal-based material in selective laser melting.
Background
At present, a gear is one of important transmission parts, and has the characteristics of large transmission power range, high transmission efficiency and capability of arbitrarily transmitting motion and power between two shafts. However, when the load is large, the friction of the gear is small but the lubrication is inconvenient, although the lubrication can be solved by using the plastic gear, the load born by the plastic gear is limited. Ti3AlC2The compound has the dual characteristics of metal and ceramic, has good heat conduction and electric conduction performance at normal temperature like metal, has lower Vickers hardness and higher elastic modulus and shear modulus, can be mechanically processed, and has certain plasticity at high temperature; meanwhile, the ceramic material also has the characteristics of ceramic, high yield strength, high melting point, high thermal stability, good oxidation resistance and self-lubricating property. The method comprises the steps of mixing Ti powder, TiC powder, Al powder and carbon powder in an atomic layer by a ball milling method, and triggering an exothermic reaction to generate Ti in the additive manufacturing layer-by-layer printing process3AlC2In addition, the matrix of the gear adopts five components of Al, Ti, Cu, Ni and Mn, and the granularity of the fine metal powder after ball milling can be very fine, so atomic layer mixing can be realized in the melting process, and finally the high-entropy alloy is generated.
At present, most of high-entropy alloys are prepared by adopting electric arc melting/traditional casting, but the high-entropy alloys have the defects of large and thick grains, high processing cost, difficulty in preparing parts with complex structures and the like. Additive manufacturing technology, also known as 3D printing, is the direct printing of materials by stacking from bottom to top, layer by layer, without the need for molds to produce complex geometriesA shaped metal part. Selective Laser Melting (SLM) is one of laser additive manufacturing technologies, and laser is used as a heat source, so that high-energy density of the laser can rapidly melt elemental metal powder with a high melting point, and a macroscopic structure and a microstructure are synchronously manufactured. In the process, metallurgical bonding is formed between the molten powder, and the cooling rate is extremely high and can reach 107K/s, fine formed crystal grains and certain distributed lubricating Ti3AlC2And high-strength high-entropy alloy parts. Wherein Ti is generated in the part3AlC2Has the dual characteristics of metal and ceramic, can be cut, therefore, in the occasion with high precision requirement, the precision of the part can be further improved by cutting, and Ti3AlC2The self-lubricating property of the alloy can reduce the friction of the gear in the using process, and the high-entropy alloy has high strength, so that the gear has the characteristics of high strength and good wear resistance.
Disclosure of Invention
The invention firstly pairs Ti3AlC2The precursor Ti powder, TiC powder, Al powder and carbon powder are subjected to ball milling and mixing, so that the mixed powder is mixed to a certain degree at the atomic level, the precursor can perform exothermic reaction, and the exothermic reaction is triggered to generate Ti with self-lubricating property when the precursor is melted in a laser selective area3AlC2Compounds whose layered structure is advantageous for improving the lubricity of gears, Ti3AlC2The alloy has the characteristics of metal and ceramic, namely high stability, high yield strength and the like, can be well wetted and fused with a high-entropy alloy base in the layer-by-layer printing process, and is well combined, and the manufactured gear has the advantages of low friction and high strength.
The method for manufacturing the high-entropy alloy gear by adopting the additive manufacturing method comprises the following steps:
step one, material preparation and ball milling: raw materials of Ti powder, TiC powder, Al powder and carbon powder are mixed according to a molar ratio of 2.8-3: 0.4-0.9: 1-1.2: 1.1-1.2, adding 0.5-0.6 times of ethanol, uniformly stirring, and performing ball milling and mixing to obtain Ti3AlC2A precursor. Al, Ti, Cu, Ni and Mn in a ratio of 20-21: 24-26: 26-27: 2Performing ball milling and mixing according to the proportion of 8-29: 30-31 to prepare high-entropy alloy powder; wherein the purity of the TiC powder and the carbon powder is 99-100%, and the granularity is 1-20 mu m; the purity of the simple substance metal Al powder, Ti powder, Cu powder, Ni powder and Mn powder is 99.5-100%, and the granularity is 1-25 mu m. Ti3AlC2The ball milling and mixing of the predecessor is to adopt a steel ball milling tank to carry out ball milling and mixing, and add agate balls with different sizes, wherein the agate balls and Ti3AlC2The mass ratio of the precursors is 3.5-4: 1, the vacuum valve is opened after sealing, vacuum pumping is carried out for 20-30 minutes, then the ball milling tank is placed into a planetary ball mill, the rotating speed is 300-350 r/min, the inversion frequency is 30-45 Hz, and the ball milling and mixing time is 4-12 hours. The ball milling and mixing of the high-entropy alloy powder are carried out by adopting a steel ball milling tank, adding agate balls with different sizes, wherein the mass ratio of the agate balls to the high-entropy alloy powder is 3-3.5: 1, sealing, opening a vacuum valve, vacuumizing for 20-30 minutes, then putting the ball milling tank into a planetary ball mill, rotating at 300-350 r/min, inverting at 30-45 Hz, and carrying out ball milling and mixing for 3-9 hours.
Step two, adding Ti3AlC2The mass ratio of the precursor to the high-entropy alloy powder is 5-8: 92-95 as raw materials for additive manufacturing.
And step three, slicing the three-dimensional model of the manufactured gear, and designing a scanning track for selective laser melting, wherein the size of the gear is not more than 240mm multiplied by 280 mm. The scanning track is formed by dispersing a continuous gear three-dimensional CAD model into slices with the thickness of 20-30 mu m in a layering sequence by using a slicing technology, further converting the slices into a series of two-dimensional plane data, and designing the scanning track according to the outline generated by each layer of slices.
Step four, powder is spread layer by layer on a powder bed of the raw materials for additive manufacturing in a protective atmosphere working chamber, the powder bed moves downwards in sequence according to the thickness of the slices, then the gear is manufactured by adopting the additive manufacturing method of selective laser melting by adopting a designed scanning track, and the selective laser melting parameters are as follows: in a working chamber with a protective atmosphere, laser is used as a heat source, the laser power is 100-200W, the diameter of a laser spot is 25-50 mu m, and the scanning speed is 2500-26000 mm/min.
And fifthly, taking out the gear from the protective atmosphere working chamber, and carrying out cleaning and heat treatment to obtain a finished product, wherein the heat treatment is annealing at 500-550 ℃ for 30-45 min.
The invention has the beneficial effects that:
(1) the invention adopts raw materials of Ti powder, TiC powder, Al powder and carbon powder to be ball-milled and mixed firstly, so that the raw materials have certain contact in an atomic layer, and the raw materials are ignited to carry out exothermic reaction through subsequent laser scanning to form Ti locally3AlC2The compound plays a certain self-lubricating role. In addition, the high entropy alloy matrix can be reinforced even if unreacted TiC or the like is present.
(2) The invention adopts an additive manufacturing method, Ti3AlC2The method can be used for machining, can further improve the precision of parts by adopting a small amount of cutting machining, is used for occasions with higher precision requirements, and has the characteristics of quick forming and strong adaptability.
(3) The high-entropy alloy matrix has the advantages of high strength and good toughness, belongs to a difficult-to-machine material, and can avoid a large amount of cutting processing and reduce the manufacturing cost by adopting additive manufacturing. Scanning Ti addition by adopting laser selective melting technology3AlC2The high-entropy alloy powder of (2) can also be used for manufacturing other parts.
Detailed Description
Example 1:
step one, material preparation and ball milling: raw materials of Ti powder, TiC powder, Al powder and carbon powder are mixed according to a molar ratio of 2.8: 0.4: 1: 1.1 mixing, adding 0.5 times of ethanol, stirring, and ball milling to obtain Ti3AlC2A precursor; mixing Al, Ti, Cu, Ni and Mn according to the weight ratio of 20: 24: 26:28: ball milling and mixing are carried out according to the proportion of 30, and high-entropy alloy powder is prepared; wherein the purity of the TiC powder and the carbon powder is 99-100%, and the granularity is 1-20 mu m; the purity of the simple substance metal Al powder, Ti powder, Cu powder, Ni powder and Mn powder is 99.5-100%, and the granularity is 1-25 mu m. Ti3AlC2The ball milling and mixing of the predecessor is to adopt a steel ball milling tank to carry out ball milling and mixing, and add agate balls with different sizes, the agate balls and Ti3AlC2The mass ratio of the precursors is 3.5: 1, and the vacuum valve is opened to pump after sealingVacuum is carried out for 20 minutes, then the ball milling tank is put into a planetary ball mill, the rotating speed is 300r/min, the inversion frequency is 30Hz, and the ball milling and mixing time is 4 hours. The ball milling and mixing of the high-entropy alloy powder are carried out by adopting a steel ball milling tank, adding agate balls with different sizes, wherein the mass ratio of the agate balls to the high-entropy alloy powder is 3: 1, sealing, opening a vacuum valve, vacuumizing for 20 minutes, then putting the ball milling tank into a planetary ball mill, rotating at 300r/min, inverting at 30Hz, and carrying out ball milling and mixing for 3 hours.
Step two, adding Ti3AlC2The mass ratio of the precursor to the high-entropy alloy powder is 5: 92 as raw materials for additive manufacturing.
And step three, slicing the three-dimensional model of the manufactured gear, and designing a scanning track for selective laser melting, wherein the size of the gear is not more than 240mm multiplied by 280 mm. The scanning track is formed by dispersing a continuous gear three-dimensional CAD model into a layered slice with the thickness of 20 μm by using a slicing technology, converting the slice into a series of two-dimensional plane data, and designing the scanning track according to the outline generated by each layer of slice.
Step four, powder bed in the protective atmosphere working chamber spreads powder layer by layer to the raw materials of additive manufacturing, the powder bed moves downwards in turn according to the thickness of the slice, then the gear is manufactured by adopting the additive manufacturing method of laser selective melting by adopting the designed scanning track, and the parameters of the laser selective melting are as follows: in a working chamber with protective atmosphere, laser is used as a heat source, the power of the working chamber is 100W, the diameter of a laser spot is 25 mu m, and the scanning speed is 2500 mm/min.
And fifthly, taking out the gear from the protective atmosphere working chamber, and carrying out cleaning and heat treatment to obtain a finished product, wherein the heat treatment is annealing at 500 ℃ for 45 min.
Experiments show that high-entropy alloy powder added with mixed powder of Ti powder, TiC powder, Al powder and carbon powder is prepared by selective laser melting3AlC2The lubricated parts, Ti powder, TiC powder, Al powder and carbon powder mixed powder can generate exothermic reaction to generate Ti after laser scanning3AlC2The compound, after mating with GCr15, was found to be after grindingThe surface of the part can form a lubricating film, AlCuMnNiTi high-entropy alloy is arranged in the part substrate, and some excessive metals which can not generate exothermic reaction can form high-entropy alloy or form carbide.
Example 2:
step one, material preparation and ball milling: raw materials of Ti powder, TiC powder, Al powder and carbon powder are mixed according to a molar ratio of 3: 0.9: 1.2: 1.2 mixing, adding 0.6 times of ethanol, stirring, and ball milling to obtain Ti3AlC2A precursor; al, Ti, Cu, Ni and Mn are mixed according to the weight ratio of 21:26: 27: 29: ball milling and mixing are carried out according to the proportion of 31, and high-entropy alloy powder is prepared; wherein the purity of the TiC powder and the carbon powder is 99-100%, and the granularity is 1-20 mu m; the purity of the simple substance metal Al powder, Ti powder, Cu powder, Ni powder and Mn powder is 99.5-100%, and the granularity is 1-25 mu m. Ti3AlC2The ball milling and mixing of the predecessor is to adopt a steel ball milling tank to carry out ball milling and mixing, and add agate balls with different sizes, wherein the agate balls and Ti3AlC2The mass ratio of the precursors is 4: 1, the vacuum valve is opened after sealing, vacuum pumping is carried out for 30 minutes, then the ball milling tank is placed into a planetary ball mill, the rotating speed is 350r/min, the inversion frequency is 45Hz, and the ball milling mixing time is 12 hours. The ball milling and mixing of the high-entropy alloy powder are carried out by adopting a steel ball milling tank, adding agate balls with different sizes, wherein the mass ratio of the agate balls to the high-entropy alloy powder is 3.5: 1, sealing, opening a vacuum valve, vacuumizing for 30 minutes, then putting the ball milling tank into a planetary ball mill, rotating at 350r/min, inverting at 45Hz, and carrying out ball milling and mixing for 3 hours.
Step two, adding Ti3AlC2The mass ratio of the precursor to the high-entropy alloy powder is 8: 95 as raw materials for additive manufacturing.
And step three, slicing the three-dimensional model of the manufactured gear, and designing a scanning track for selective laser melting, wherein the size of the gear is not more than 240mm multiplied by 280 mm. The scanning track is formed by utilizing a slicing technology to discretize a continuous gear three-dimensional CAD model into a layered sequential slice with the thickness of 30 mu m, converting the slice into a series of two-dimensional plane data, and designing the scanning track according to the outline generated by each layer of slice.
Step four, powder bed in the protective atmosphere working chamber spreads powder layer by layer to the raw materials of additive manufacturing, the powder bed moves downwards in turn according to the thickness of the slice, then the gear is manufactured by adopting the additive manufacturing method of laser selective melting by adopting the designed scanning track, and the parameters of the laser selective melting are as follows: in a working chamber with protective atmosphere, laser is used as a heat source, the power of the working chamber is 200W, the diameter of a laser spot is 25 mu m, and the scanning speed is 26000 mm/min.
And fifthly, taking out the gear from the protective atmosphere working chamber, and carrying out cleaning and heat treatment to obtain a finished product, wherein the heat treatment is annealing at 550 ℃ for 30 min.
Experiments show that high-entropy alloy powder added with mixed powder of Ti powder, TiC powder, Al powder and carbon powder is prepared by selective laser melting3AlC2The lubricated parts, Ti powder, TiC powder, Al powder and carbon powder mixed powder can generate exothermic reaction to generate Ti after laser scanning3AlC2After the compound is subjected to butt-grinding with a mating part of GCr15, a lubricating film can be formed on the worn surface of the part, the part matrix is AlCuMnNiTi high-entropy alloy, and some excessive metals which cannot generate exothermic reaction can form high-entropy alloy or form carbide. The gear can further improve the machining precision through machining so as to be suitable for high-precision use occasions.
Example 3:
step one, material preparation and ball milling: raw materials of Ti powder, TiC powder, Al powder and carbon powder are mixed according to a molar ratio of 2.9: 0.6: 1.1: 1.2 mixing, adding 0.55 times of ethanol, stirring, and ball milling to obtain Ti3AlC2A precursor; performing ball milling and mixing on Al, Ti, Cu, Ni and Mn according to the proportion of 20.5:25:26.5:28.5:30.5 to prepare high-entropy alloy powder; wherein the purity of the TiC powder and the carbon powder is 99-100%, and the granularity is 1-20 mu m; the purity of the simple substance metal Al powder, Ti powder, Cu powder, Ni powder and Mn powder is 99.5-100%, and the granularity is 1-25 mu m. Ti3AlC2The ball milling and mixing of the predecessor is to adopt a steel ball milling tank to carry out ball milling and mixing, and add agate balls with different sizes, wherein the agate balls and Ti3AlC2The mass ratio of the precursors is 3.7: 1, and the density is highAfter sealing, opening a vacuum valve to vacuumize for 25 minutes, then putting the ball milling tank into a planetary ball mill, wherein the rotating speed is 320r/min, the inversion frequency is 38Hz, and the ball milling and mixing time is 8 hours. The ball milling and mixing of the high-entropy alloy powder are carried out by adopting a steel ball milling tank, adding agate balls with different sizes, wherein the mass ratio of the agate balls to the high-entropy alloy powder is 3.3: 1, sealing, opening a vacuum valve, vacuumizing for 25 minutes, then putting the ball milling tank into a planetary ball mill, rotating at 320r/min, inverting at 37Hz, and carrying out ball milling and mixing for 6 hours.
Step two, adding Ti3AlC2The mass ratio of the precursor to the high-entropy alloy powder is 6: 94 as raw materials for additive manufacturing.
And step three, slicing the three-dimensional model of the manufactured gear, and designing a scanning track for selective laser melting, wherein the size of the gear is not more than 240mm multiplied by 280 mm. The scanning track is formed by utilizing a slicing technology to discretize a continuous gear three-dimensional CAD model into slices with the thickness of 25 mu m in a layered sequence, converting the slices into a series of two-dimensional plane data, and designing the scanning track according to the outline generated by each layer of slices.
Step four, powder bed in the protective atmosphere working chamber spreads powder layer by layer to the raw materials of additive manufacturing, the powder bed moves downwards in turn according to the thickness of the slice, then the gear is manufactured by adopting the additive manufacturing method of laser selective melting by adopting the designed scanning track, and the parameters of the laser selective melting are as follows: in a working chamber with protective atmosphere, laser is used as a heat source, the power of the working chamber is 150W, the diameter of a laser spot is 35 mu m, and the scanning speed is 12500 mm/min.
And fifthly, taking out the gear from the protective atmosphere working chamber, and carrying out cleaning and heat treatment to obtain a finished product, wherein the heat treatment is annealing at 520 ℃ for 35 min.
Experiments show that the high-entropy alloy powder added with the mixed powder of Ti powder, TiC powder, Al powder and carbon powder is prepared by selective laser melting, wherein the mixed powder of Ti powder, TiC powder, Al powder and carbon powder is subjected to an exothermic reaction after being scanned by laser to generate Ti3AlC2The compound, after mating with GCr15, was found to be due to the addition of Ti3AlC2The precursor is less, a lubricating film can still be formed on the wear surface, AlCuMnNiTi high-entropy alloy is arranged in the part substrate, some redundant metal which cannot generate exothermic reaction can form high-entropy alloy or carbide, and the manufactured gear has the characteristic of high strength.
Example 4:
step one, material preparation and ball milling: raw materials of Ti powder, TiC powder, Al powder and carbon powder are mixed according to a molar ratio of 2.9: 0.7: 1.1: 1.2 mixing, adding 0.56 times of ethanol, stirring, and ball-milling to obtain Ti3AlC2A precursor; performing ball milling and mixing on Al, Ti, Cu, Ni and Mn according to the ratio of 21:26:26:28:30 to prepare high-entropy alloy powder; wherein the purity of the TiC powder and the carbon powder is 99-100%, and the granularity is 1-20 mu m; the purity of the simple substance metal Al powder, Ti powder, Cu powder, Ni powder and Mn powder is 99.5-100%, and the granularity is 1-25 mu m. Ti3AlC2The ball milling and mixing of the predecessor is to adopt a steel ball milling tank to carry out ball milling and mixing, and add agate balls with different sizes, wherein the agate balls and Ti3AlC2The mass ratio of the precursors is 3.8: 1, a vacuum valve is opened after sealing, vacuum pumping is carried out for 25 minutes, then the ball milling tank is placed into a planetary ball mill, the rotating speed is 330r/min, the inversion frequency is 38Hz, and the ball milling mixing time is 6 hours. The ball milling and mixing of the high-entropy alloy powder are carried out by adopting a steel ball milling tank, adding agate balls with different sizes, wherein the mass ratio of the agate balls to the high-entropy alloy powder is 3.2: 1, sealing, opening a vacuum valve, vacuumizing for 25 minutes, then putting the ball milling tank into a planetary ball mill, rotating at 320r/min, inverting at 35Hz, and carrying out ball milling and mixing for 5 hours.
Step two, adding Ti3AlC2The mass ratio of the precursor to the high-entropy alloy powder is 8: 94 as raw materials for additive manufacturing.
And step three, slicing the three-dimensional model of the manufactured gear, and designing a scanning track for selective laser melting, wherein the size of the gear is not more than 240mm multiplied by 280 mm. The scanning track is formed by utilizing a slicing technology to discretize a continuous gear three-dimensional CAD model into a layered sequential slice with the thickness of 27 mu m, converting the slice into a series of two-dimensional plane data, and designing the scanning track according to the contour generated by each layer of slice.
Step four, powder bed in the protective atmosphere working chamber spreads powder layer by layer to the raw materials of additive manufacturing, the powder bed moves downwards in turn according to the thickness of the slice, then the gear is manufactured by adopting the additive manufacturing method of laser selective melting by adopting the designed scanning track, and the parameters of the laser selective melting are as follows: in a working chamber with protective atmosphere, laser is used as a heat source, the power of the working chamber is 180W, the diameter of a laser spot is 40 mu m, and the scanning speed is 16000 mm/min.
And fifthly, taking out the gear from the protective atmosphere working chamber, and cleaning and carrying out heat treatment to obtain a finished product, wherein the heat treatment is annealing at 510 ℃ for 45 min.
Experiments show that high-entropy alloy powder added with mixed powder of Ti powder, TiC powder, Al powder and carbon powder is manufactured by selective laser melting, and high-entropy alloy-based Ti can be manufactured according to a designed scanning track3AlC2The lubricated parts, Ti powder, TiC powder, Al powder and carbon powder mixed powder can partially generate exothermic reaction to generate Ti after laser scanning3AlC2Part of unreacted materials are distributed on the high-entropy alloy matrix, so that the strength of the high-entropy alloy is improved, and after the high-entropy alloy is subjected to butt-grinding with a mating part of GCr15, a lubricating film can be formed on a wear surface, so that the friction reduction and wear resistance of the gear are facilitated.
Claims (10)
1. A method for manufacturing a high-entropy alloy gear in an additive mode is manufactured by a laser selective melting method of multiple metal powders in a protective atmosphere, and is characterized by comprising the following steps:
step one, material preparation and ball milling: raw materials of Ti powder, TiC powder, Al powder, carbon powder and ethanol are proportioned according to a certain proportion and are ball-milled and mixed to prepare Ti3AlC2A precursor; ball-milling and mixing Al, Ti, Cu, Ni and Mn according to a certain proportion to prepare high-entropy alloy powder;
step two, adding Ti3AlC2The mass ratio of the precursor to the high-entropy alloy powder is 5-8: 92-95 as raw materials for additive manufacturing;
thirdly, carrying out slicing and thickness design on the three-dimensional model of the manufactured gear, and designing a scanning track for selective laser melting;
step four, powder is spread layer by layer on a powder bed in a protective atmosphere working chamber, the powder bed moves downwards in sequence according to the thickness of the slices, and then a gear is manufactured by adopting a vibration material disk manufacturing method of performing selective laser melting by adopting a designed scanning track;
and fifthly, taking out the gear from the protective atmosphere working chamber, and cleaning and carrying out heat treatment to obtain a finished product.
2. A method of additive manufacturing of a high entropy alloy gear according to claim 1, wherein: the purity of the TiC powder and the carbon powder is 99-100%, and the granularity is 1-20 mu m; the purity of the Al powder, the Ti powder, the Cu powder, the Ni powder and the Mn powder is 99.5-100%, and the granularity is 1-25 mu m.
3. A method of additive manufacturing of a high entropy alloy gear according to claim 1, wherein: the ingredients are Ti powder, TiC powder, Al powder and carbon powder according to a molar ratio of 2.8-3: 0.4-0.9: 1-1.2: 1.1-1.2, adding 0.5-0.6 times of ethanol, stirring uniformly, and making into Ti3AlC2The precursor of (1).
4. A method of additive manufacturing of a high entropy alloy gear according to claim 1, wherein: the high-entropy alloy powder is prepared by ball-milling and mixing Al, Ti, Cu, Ni and Mn according to a certain proportion, and the Al, Ti, Cu, Ni and Mn powders are mixed according to the mass proportion of 20-21: 24-26: 26-27: 28-29: 30-31.
5. A method of additive manufacturing of a high entropy alloy gear according to claim 1, wherein: the ball milling is mixed to prepare Ti3AlC2The predecessor is ball-milled and mixed by a steel ball-milling tank, and agate balls with different sizes are added, wherein the agate balls and Ti3AlC2The mass ratio of the precursors is 3.5-4: 1, the vacuum valve is opened after sealing, the vacuum is pumped for 20-30 minutes,and then putting the ball milling tank into a planetary ball mill, wherein the rotating speed is 300-350 r/min, the inversion frequency is 30-45 Hz, and the ball milling and mixing time is 4-12 h.
6. A method of additive manufacturing of a high entropy alloy gear according to claim 1, wherein: the high-entropy alloy powder is prepared by ball milling and mixing in a steel ball milling tank, adding agate balls with different sizes, wherein the mass ratio of the agate balls to the high-entropy alloy powder is 3-3.5: 1, sealing, opening a vacuum valve, vacuumizing for 20-30 minutes, putting the ball milling tank into a planetary ball mill at the rotating speed of 300-350 r/min and the inversion frequency of 30-45 Hz, and carrying out ball milling and mixing for 3-9 hours.
7. A method of additive manufacturing of a high entropy alloy gear according to claim 1, wherein: the size of the gear is not more than 240mm multiplied by 280 mm.
8. A method of additive manufacturing of a high entropy alloy gear according to claim 1, wherein: the scanning track is formed by dispersing a continuous gear three-dimensional CAD model into slices with the thickness of 20-30 mu m in a layering sequence by using a slicing technology, converting the slices into a series of two-dimensional plane data, and designing the scanning track according to the profile generated by each layer of slices.
9. A method of additive manufacturing of a high entropy alloy gear according to claim 1, wherein: the selective laser melting has the following specific parameters: in a working chamber with a protective atmosphere, laser is used as a heat source, the laser power is 100-200W, the diameter of a laser spot is 25-50 mu m, and the scanning speed is 2500-26000 mm/min.
10. A method of additive manufacturing of a high entropy alloy gear according to claim 1, wherein: the heat treatment is annealing at 500-550 ℃ for 30-45 min.
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