LU502453B1 - Method for preparing aluminum alloy-diamond composite material by adopting additive manufacturing technology - Google Patents
Method for preparing aluminum alloy-diamond composite material by adopting additive manufacturing technology Download PDFInfo
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- LU502453B1 LU502453B1 LU502453A LU502453A LU502453B1 LU 502453 B1 LU502453 B1 LU 502453B1 LU 502453 A LU502453 A LU 502453A LU 502453 A LU502453 A LU 502453A LU 502453 B1 LU502453 B1 LU 502453B1
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- diamond
- aluminum alloy
- composite material
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- additive manufacturing
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- 229910003460 diamond Inorganic materials 0.000 title claims abstract description 132
- 239000010432 diamond Substances 0.000 title claims abstract description 132
- 239000002131 composite material Substances 0.000 title claims abstract description 52
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 title claims abstract description 33
- 229910052782 aluminium Inorganic materials 0.000 title claims abstract description 31
- 238000000034 method Methods 0.000 title claims abstract description 30
- 239000000654 additive Substances 0.000 title claims abstract description 22
- 230000000996 additive effect Effects 0.000 title claims abstract description 22
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 22
- 238000005516 engineering process Methods 0.000 title claims abstract description 17
- 238000002360 preparation method Methods 0.000 claims abstract description 10
- 229910000838 Al alloy Inorganic materials 0.000 claims description 32
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 24
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 22
- 239000002245 particle Substances 0.000 claims description 15
- MTPVUVINMAGMJL-UHFFFAOYSA-N trimethyl(1,1,2,2,2-pentafluoroethyl)silane Chemical compound C[Si](C)(C)C(F)(F)C(F)(F)F MTPVUVINMAGMJL-UHFFFAOYSA-N 0.000 claims description 15
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 12
- 229910052786 argon Inorganic materials 0.000 claims description 12
- 239000008367 deionised water Substances 0.000 claims description 12
- 229910021641 deionized water Inorganic materials 0.000 claims description 12
- 238000002844 melting Methods 0.000 claims description 12
- 230000008018 melting Effects 0.000 claims description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 12
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims description 10
- 239000000758 substrate Substances 0.000 claims description 9
- 238000004381 surface treatment Methods 0.000 claims description 9
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 claims description 9
- 229910052721 tungsten Inorganic materials 0.000 claims description 9
- 239000010937 tungsten Substances 0.000 claims description 9
- 238000003756 stirring Methods 0.000 claims description 8
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 6
- 238000001035 drying Methods 0.000 claims description 6
- 239000012535 impurity Substances 0.000 claims description 6
- 239000000843 powder Substances 0.000 claims description 6
- 230000001681 protective effect Effects 0.000 claims description 6
- 239000010936 titanium Substances 0.000 claims description 6
- 229910052719 titanium Inorganic materials 0.000 claims description 6
- 230000007704 transition Effects 0.000 claims description 6
- 150000003839 salts Chemical class 0.000 claims description 5
- 239000011780 sodium chloride Substances 0.000 claims description 5
- 238000002156 mixing Methods 0.000 claims description 4
- 238000004506 ultrasonic cleaning Methods 0.000 claims description 4
- 238000000137 annealing Methods 0.000 claims description 3
- 238000001816 cooling Methods 0.000 claims description 2
- 238000005406 washing Methods 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 14
- 230000003213 activating effect Effects 0.000 description 4
- 238000003763 carbonization Methods 0.000 description 4
- 239000011248 coating agent Substances 0.000 description 4
- 238000000576 coating method Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 3
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000002309 gasification Methods 0.000 description 2
- 230000017525 heat dissipation Effects 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000002679 ablation Methods 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000012512 characterization method Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000004377 microelectronic Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 238000012536 packaging technology Methods 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 238000010183 spectrum analysis Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C21/00—Alloys based on aluminium
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
- B22F1/05—Metallic powder characterised by the size or surface area of the particles
- B22F1/052—Metallic powder characterised by the size or surface area of the particles characterised by a mixture of particles of different sizes or by the particle size distribution
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
- B22F1/18—Non-metallic particles coated with metal
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F10/00—Additive manufacturing of workpieces or articles from metallic powder
- B22F10/20—Direct sintering or melting
- B22F10/28—Powder bed fusion, e.g. selective laser melting [SLM] or electron beam melting [EBM]
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F10/00—Additive manufacturing of workpieces or articles from metallic powder
- B22F10/30—Process control
- B22F10/36—Process control of energy beam parameters
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- 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
- B33Y10/00—Processes of additive manufacturing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- 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
- B33Y70/00—Materials specially adapted for additive manufacturing
- B33Y70/10—Composites of different types of material, e.g. mixtures of ceramics and polymers or mixtures of metals and biomaterials
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C14/00—Alloys based on titanium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C26/00—Alloys containing diamond or cubic or wurtzitic boron nitride, fullerenes or carbon nanotubes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F10/00—Additive manufacturing of workpieces or articles from metallic powder
- B22F10/60—Treatment of workpieces or articles after build-up
- B22F10/64—Treatment of workpieces or articles after build-up by thermal means
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Plasma & Fusion (AREA)
- Ceramic Engineering (AREA)
- Civil Engineering (AREA)
- Composite Materials (AREA)
- Structural Engineering (AREA)
- Automation & Control Theory (AREA)
- Crystals, And After-Treatments Of Crystals (AREA)
Abstract
The present disclosure provides a method for preparing an aluminum alloy-diamond composite material by adopting the additive manufacturing technology, belongs to the technical field of composite material preparation.
Description
BL-5524
METHOD FOR PREPARING ALUMINUM ALLOY-DIAMOND COMPOSITE 4502453
MATERIAL BY ADOPTING ADDITIVE MANUFACTURING TECHNOLOGY
[0001] The present disclosure belongs to the technical field of composite material preparation, specifically relates to a method for preparing an aluminum alloy-diamond composite material by adopting an additive manufacturing technology.
[0002] With the development of integration technology and microelectronic packaging technology, the total power density of electronic components continues to increase, while the physical size of electronic components and electronic equipment tends to be small and miniaturized.
[0003] Additive manufacturing is regarded as a "bottom-up" manufacturing method through the additive molding of materials, and its advantages in the preparation of complex and heterogeneous materials are unrivaled. The main reasons for its difficulty to achieve are the problems such as poor interface between diamond and metal, high porosity, carbonization of diamond under laser, and poor flowability of diamond in the laser molten pool. However, it can be expected that the success of additive manufacturing of aluminum alloy-diamond composite materials will inevitably promote the development of low-cost, high-precision preparation and low-threshold popularization of other isomer diamond alloy composite materials, causing new industrial changes of diamond alloy composite materials.
[0004] The object of the present disclosure is to solve the problems such as poor interface bonding of diamond and aluminum alloy, diamond carbonization in the preparation process, and provides a method for preparing an aluminum alloy-diamond composite material by adopting an additive manufacturing technology.
[0005] In order to achieve the above object, the present disclosure adopts the following technical solutions:
[0006] A method for preparing an aluminum alloy-diamond composite material by adopting the additive manufacturing technology comprises the following steps:
[0007] step 1, pretreatment of diamond: sequentially carrying out ultrasonic cleaning on natural diamond with the particle size of 30-50 um by using deionized water and alcohol, stirring the treated diamond in hydrochloric acid with the concentration of 0.5-1 mol at 50-80°C for 30 min, then repeatedly washing by adopting deionized water until the pH value of the subnatant is 7, and drying at 60-80°C for 8-12 h;
[0008] step 2, surface treatment of diamond: uniformly mixing the diamond and titanium powder according to a molar ratio of (5-10): 1, then adding sodium chloride which is 5-10 times of the total mass of the diamond and the titanium powder, and reacting for 1.5-2.5 h at 750-850°C under a vacuum condition of 107 MPa by adopting a salt melting method to obtain titanium-coated diamond with a titanium carbide layer as 1
BL-5524 a transition layer; LU502453
[0009] step 3, premixing of diamond and aluminum alloy : mixing the diamond that is subjected to surface treatment and the aluminum alloy powder for 20-30 min in an argon environment under the conditions that the rotating speed is 5-10 r/min and the stirring rotating speed is 300-500 r/min;
[0010] step 4, preparation of a diamond aluminum-based composite material by a selective laser melting method: preheating a tungsten substrate under the matched laser conditions in an argon protective atmosphere, and reacting, wherein the specific parameters are as follows: the laser power is 200-300 W, the laser wavelength is 1.06 um, the laser spot diameter is 200-400 um, the scanning speed is 200-600 mm/s, the scanning distance is 100 um, the laying thickness is 50-100 um, and the temperature of the tungsten substrate is 200-300°C;
[0011] step 5, post-treatment of the aluminum alloy-diamond composite material: annealing the prepared sample piece for 2 h at 300-350°C, and cooling along with a furnace.
[0012] Compared with the prior art, the present disclosure has the following beneficial effects:
[0013] (1) an additive manufacturing method is adopted for the first time, so the problems such as poor interface between diamond and metal, high porosity, carbonization of diamond under laser, are well solved, and the preparation of the aluminum alloy-diamond composite material is realized;
[0014] (2) the composite material prepared by the method has the advantages of low density, good mechanical property, high heat conductivity, etc. Meanwhile, the method can realize preparation of the aluminum alloy-diamond composite material with a complex structure, and has the advantages of high precision, high speed, safety, stability, low cost, etc.
[0015] FIG. 1 is a surface morphology diagram of diamond that is subjected to pretreatment;
[0016] FIG. 2 is a morphology diagram of a coated titanium carbide coating on surfaces of diamond particles;
[0017] FIG. 3 is a surface energy spectrogram of diamond particles coated with titanium carbide;
[0018] FIG. 4 is a mixed morphology diagram of diamond particles coated with titanium carbide after surface treatment and aluminum powder;
[0019] FIG. 5 is a surface morphology diagram of an aluminum alloy composite material with a diamond volume fraction of 30%;
[0020] FIG. 6 is a microscopic scanning electron microscope morphology diagram of an aluminum alloy composite material with a diamond volume fraction of 30%;
[0021] FIG. 7 is a spiral heat dissipation structure diagram of a heterogeneous aluminum alloy with a diamond volume fraction of 30% prepared by an additive manufacturing method;
[0022] FIG. 8 is a diagram showing change of thermal conductivity of a 2
BL-5524 diamond-aluminum alloy composite material prepared by an additive manufacturing LU502453 method as the amount of diamond added;
[0023] FIG. 9 is a microscopic scanning electron microscope morphology diagram of a diamond-aluminum alloy composite material without being coated with titanium carbide;
[0024] FIG. 10 is a surface morphology diagram of an aluminum alloy composite material with a diamond volume fraction of 10%:
[0025] FIG. 11 is a microscopic scanning electron microscope morphology diagram of an aluminum alloy composite material with a diamond volume fraction of 10%;
[0026] FIG. 12 is a morphology diagram of an aluminum alloy-diamond composite material prepared by an additive manufacturing technology under different scanning speeds and laser powers; and
[0027] FIG. 13 is a comparison diagram of an X-ray energy spectrum of a 30% diamond-aluminum alloy composite material before and after different annealing.
[0028] The technical solutions of the present disclosure will be further described below in conjunction with the accompanying drawings and embodiments, but are not limited thereto. Any modification or equivalent replacement of the technical solutions of the present disclosure without departing from the spirit and scope of the technical solutions of the present disclosure shall fall within the scope of protection of the present disclosure.
[0029] Specific embodiment 1: This embodiment provides a method for preparing an aluminum alloy-diamond composite material by adopting the additive manufacturing technology, which comprises the following steps:
[0030] Step 1: pretreatment of diamond: natural diamond with a particle size range of 30-50 um is ultrasonically cleaned by using deionized water and alcohol sequentially to remove impurities and oil stains on the natural diamond and then is filtered by filter paper for later use. The treated diamond is stirred in hydrochloric acid with a concentration of 0.5-1 mol at 50-80 °C for 30 min for activating the surface of the diamond. The diamond is repeatedly washed by deionized water until the pH value of the subnatant is 7, and then the diamond is dried in an air blast drying oven at 60-80 °C for 8-12 h;
[0031] Step 2: surface treatment of diamond: Due to the extremely poor wettability of diamond and aluminum, in order to form a good cross-section between diamond and aluminum alloy, it is necessary to coat a layer of titanium carbide transition layer on the surface of diamond to increase its wettability with aluminum alloy. The diamond and titanium powder are uniformly mixed according to the molar ratio of the diamond to the titanium powder of (5-10): 1. Then sodium chloride which is 5-10 times of the total mass of the diamond and the titanium powder is added and reacted at 750-850 °C for 1.5-2.5 h under a vacuum condition of 10° MPa by adopting a salt melting method to obtain the titanium-coated diamond taking a titanium carbide layer as a transition layer; after the reaction, it is characterized by thermogravimetric test. The coating speed of titanium carbide on the diamond surface is 5 um/hour, so the thickness of 3
BL-5524 titanium-coated diamond is between 7.5 and 12.5 um; LU502453
[0032] Step 3: premixing of diamond and aluminum alloy: the diamond that is subjected to surface treatment and aluminum alloy powder (AlSi-12) are mixed in an argon environment for 20-30 min by adopting a V-shaped mixer under conditions that the rotating speed of a barrel in the V-shaped mixer is 5-10 r/min and the stirring rotating speed is 300-500 r/min;
[0033] Step 4: preparation of a diamond aluminum-based composite material by a selective laser melting method: in the argon protective atmosphere, by selecting the matching laser conditions and preheating the tungsten substrate, the reaction is carried out. The specific parameters are as follows: the laser power is 200-300 W, the laser wavelength is 1.06 um, the laser spot diameter is 200-400 um, the scanning speed was 200 mm/s- 600 mm/s, the scanning distance is 100 um, the laying thickness is 50-100 um and the temperature of a tungsten substrate was 200-300 °C. Under the condition that the aluminum alloy is melted, the diamond ablation caused by the local high temperature of the laser should be avoided as much as possible. High-energy energy density is beneficial to the melting and forming of aluminum alloys, but excessively concentrated energy will lead to excessively high temperature under the light spot, diamond carbonization or even gasification. FIG. 12 shows a morphology diagram of an aluminum alloy-diamond composite material prepared by an additive manufacturing technology under different scanning speeds and laser powers;
[0034] Step 5: post-treatment of the aluminum alloy-diamond composite material: the prepared sample piece is annealed at 300-350°C for 2 h and then cooled along with the furnace to eliminate or reduce uneven composition or structure, refine grains and improve the rate of elongation. FIG. 13 shows that the original coarse grains of the annealed aluminum alloy composite material are recrystallized to achieve the purpose of refining the grains with fewer defects and improving the strength and thermal conductivity of the composite material.
[0035] Specific embodiment 2: In a method for preparing an aluminum alloy-diamond composite material by adopting the additive manufacturing technology of the specific embodiment 1, in the step 1, the particle size of the natural diamond is in micron level, with a diameter of 30-40 um, and the content of impurities is less than 1 ppm.
[0036] Specific embodiment 3: In a method for preparing an aluminum alloy-diamond composite material by adopting the additive manufacturing technology of the specific embodiment 1, in the step 1, the conditions of the ultrasonic cleaning are 50-60 kHz, 400-600 W.
[0037] Specific embodiment 4: In a method for preparing an aluminum alloy-diamond composite material by adopting the additive manufacturing technology of the specific embodiment 1, in the step 2, the particle size of the titanium powder is 20 um.
[0038] Specific embodiment 5: In a method for preparing an aluminum alloy-diamond composite material by adopting the additive manufacturing technology of the specific embodiment 1, in the step 3, the particle size of the aluminum alloy is 30-60 um. 4
BL-5524
[0039] Specific embodiment 6: In a method for preparing an aluminum LU502453 alloy-diamond composite material by adopting the additive manufacturing technology of the specific embodiment 1, in the step 3, the volume fraction of the diamond 1s 10%-30%, and composite materials with different volume fractions can be obtained.
[0040] Example 1:
[0041] (1) Natural diamond with a particle size range of 30-50 um was ultrasonically cleaned by using deionized water and alcohol at 60 kHz under power of 500 W sequentially to remove impurities and oil stains on the natural diamond and then was filtered by filter paper for later use. The treated diamond was stirred in hydrochloric acid with a concentration of 1 mol at 80°C for 30 min for activating the surface of the diamond. The diamond was repeatedly washed by deionized water until the pH value of the subnatant was 7, and then the diamond was dried in an air blast drying oven at 60°C for 8 h, wherein the morphology of the diamond was shown in FIG. 1;
[0042] (2) the activated micron diamond and titanium powder (20 um) were uniformly mixed according to the molar ratio of the diamond to the titanium powder of 8: 1. Then sodium chloride which was 5-10 times of the total mass of the diamond and the titanium powder was added and reacted at 850°C for 2 h under a vacuum condition of 10° MPa by adopting a salt melting method to obtain the titanium-coated diamond taking a titanium carbide layer as a transition layer; as shown in FIG. 2, a titanium carbide coating with a rough surface was formed on the surface of the diamond. As shown in FIG. 3, energy spectrum analysis showed that the mass of the titanium element accounted for 56%, which indicated that titanium carbide was successfully coated,
[0043] (3) the diamond that was subjected to surface treatment and aluminum alloy powder (AlSi-12) were mixed for 20 min according to the volume ratio of 3: 7 in an argon environment by adopting a V-shaped mixer under conditions that the rotating speed of a barrel in the V-shaped mixer was 5 r/min and the stirring rotating speed was 400 r/min. As shown in FIG. 4, the diamond was uniformly distributed among the aluminum powder;
[0044] (4) in the argon protective atmosphere, a diamond aluminum-based composite material was prepared by adopting a selective laser melting method under the conditions that the laser power was 250 W, the laser wavelength was 1.06 um, the laser spot diameter was 400 um, the scanning speed was 600 mm/s, the scanning distance was 100 um, the laying thickness was 100 um and the temperature of a tungsten substrate was 200 °C. FIG. 5 showed that the surface of the composite material prepared under such conditions was uniform and holes were small. FIG. 6 showed the internal morphology of the composite material prepared under such conditions, the diamond was uniformly dispersed in the aluminum alloy as shown in the figure, and the interface bonding between the diamond and the aluminum alloy was good;
[0045] (5) post-treatment of the aluminum alloy-diamond composite material was carried out, specifically, the prepared sample piece was annealed at 350°C for 2 h and then cooled along with the furnace to obtain the aluminum alloy composite material with a diamond volume fraction of 30%. FIG. 7 showed a spiral heat dissipation structure diagram of a heterogeneous diamond-aluminum alloy composite material prepared by the method. The test characterization FIG. 8 showed that the heat
BL-5524 conductivity of the aluminum alloy was obviously improved due to the addition of the LU502453 diamond, and thus the effectiveness of the method was proved.
[0046] Example 2:
[0047] (1) Natural diamond with a particle size range of 30-50 um was ultrasonically cleaned by using deionized water and alcohol at 60 kHz under power of 500 W sequentially to remove impurities and oil stains on the natural diamond and then was filtered by filter paper for later use. The treated diamond was stirred in hydrochloric acid with a concentration of 1 mol at 60°C for 30 min for activating the surface of the diamond. The diamond was repeatedly washed by deionized water until the pH value of the subnatant was 7, and then the diamond was dried in an air blast drying oven at 80°C for 12 h;
[0048] (2) the activated micron diamond and titanium powder (20 um) were uniformly mixed according to the molar ratio of the diamond to the titanium powder of 5: 1. Then sodium chloride which was 8 times of the total mass of the diamond and the titanium powder was added and reacted at 800°C for 2 h under a vacuum condition of 10° MPa by adopting a salt melting method to obtain the titanium-coated diamond taking a titanium carbide layer as a transition layer; as shown in FIG. 2, a titanium carbide coating with a rough surface was formed on the surface of the diamond.
[0049] (3) the diamond that was subjected to surface treatment and aluminum alloy powder (AlSi-12) were mixed for 20 min according to the volume ratio of 1: 9 in an argon environment by adopting a V-shaped mixer under conditions that the rotating speed of a barrel in the V-shaped mixer was 10 r/min and the stirring rotating speed was 400 r/min.
[0050] (4) in the argon protective atmosphere, a diamond aluminum-based composite material was prepared by adopting a selective laser melting method under the conditions that the laser power was 305 W, the laser wavelength was 1.06 um, the laser spot diameter was 200 um, the scanning speed was 200 mm/s, the scanning distance was 100 um, the laying thickness was 50 um and the temperature of a tungsten substrate was 200 °C. FIG. 10 showed that the surface of the composite material prepared under such conditions was rough and a plurality of holes were formed. FIG. 11 showed the internal morphology of the composite material prepared under such conditions, as shown in the figure, due to too high laser power, accumulation of scanning energy caused gasification of diamond, and a large number of holes were formed.
[0051] (5) post-treatment of the aluminum alloy-diamond composite material was carried out, specifically, the prepared sample piece was annealed at 300°C for 2 h.
[0052] Comparative Example 1:
[0053] (1) natural diamond with a particle size range of 30-50 um was ultrasonically cleaned by using deionized water and alcohol at 60 kHz under power of 500 W sequentially to remove impurities and oil stains on the natural diamond and then was filtered by filter paper for later use. The treated diamond was stirred in hydrochloric acid with a concentration of 1 mol at 80°C for 30 min for activating the surface of the diamond. The diamond was repeatedly washed by deionized water until the pH value of the subnatant was 7, and then the diamond was dried in an air blast drying oven at 60°C for 8 h; 6
BL-5524
[0054] (2) the untreated diamond and aluminum alloy powder (AlSi-12) were mixed LU502453 for 30 min according to the volume ratio of 3: 7 in an argon environment by adopting a
V-shaped mixer under conditions that the rotating speed of a barrel in the V-shaped mixer was 10 r/min and the stirring rotating speed was 400 r/min.
[0055] (3) in the argon protective atmosphere, a diamond aluminum-based composite material was prepared by adopting a selective laser melting method under the conditions that the laser power was 250 W, the laser wavelength was 1.06 um, the laser spot diameter was 400 um, the scanning speed was 600 mm/s, the scanning distance was 100 um, the laying thickness was 100 um and the temperature of a tungsten substrate was 300 °C. FIG. 9 showed an internal morphology of a diamond-aluminum alloy composite material without being coated with titanium carbide. The diamond was agglomerated and separated out in a phase-splitting mode, and the diamond and the aluminum alloy could not form a good interface.
[0056] (4) the prepared sample piece was annealed at 300°C for 2 h and then cooled along with the furnace. 7
Claims (2)
1. A method for preparing an aluminum alloy-diamond composite material by adopting the additive manufacturing technology, comprising the following steps: step 1, pretreatment of diamond: sequentially carrying out ultrasonic cleaning on natural diamond with the particle size of 30-50 um by using deionized water and alcohol, stirring the treated diamond in hydrochloric acid with the concentration of
0.5-1 mol at 50-80°C for 30 min, then repeatedly washing by adopting deionized water until the pH value of the subnatant is 7, and drying at 60-80°C for 8-12 h; step 2, surface treatment of diamond: uniformly mixing the diamond and titanium powder according to a molar ratio of (5-10): 1, then adding sodium chloride which 1s 5-10 times of the total mass of the diamond and the titanium powder, and reacting for
1.5-2.5 h at 750-850°C under a vacuum condition of 10% MPa by adopting a salt melting method to obtain titanium-coated diamond with a titanium carbide layer as a transition layer; step 3, premixing of diamond and aluminum alloy: mixing the diamond that is subjected to surface treatment and the aluminum alloy powder for 20-30 min in an argon environment under the conditions that the rotating speed is 5-10 r/min and the stirring rotating speed is 300-500 r/min; step 4, preparation of a diamond aluminum-based composite material by a selective laser melting method: preheating a tungsten substrate under the matched laser conditions in an argon protective atmosphere, and reacting, wherein the specific parameters are as follows: the laser power is 200-300 W, the laser wavelength is 1.06 um, the laser spot diameter is 200-400 um, the scanning speed is 200-600 mm/s, the scanning distance is 100 um, the laying thickness is 50-100 um, and the temperature of the tungsten substrate is 200-300°C; step 5, post-treatment of the aluminum alloy-diamond composite material: annealing the prepared sample piece for 2 h at 300-350°C, and cooling along with a furnace.
2. The method for preparing an aluminum alloy-diamond composite material by adopting the additive manufacturing technology according to claim 1, wherein in the step 1, the particle size of the natural diamond is in micron level, with a diameter of 30-40 um, and the content of impurities is less than 1 ppm; in the step 1, the conditions of the ultrasonic cleaning are 50-60 kHz, 400-600 W; In the step 2, the particle size of the titanium powder is 20 um; In the step 3, the particle size of the aluminum alloy is 30-60 um; In the step 3, the volume fraction of the diamond is 10%-30%. 8
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