CN109623130B - Preparation method of composite reinforced aluminum alloy - Google Patents
Preparation method of composite reinforced aluminum alloy Download PDFInfo
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- CN109623130B CN109623130B CN201811511254.4A CN201811511254A CN109623130B CN 109623130 B CN109623130 B CN 109623130B CN 201811511254 A CN201811511254 A CN 201811511254A CN 109623130 B CN109623130 B CN 109623130B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K20/00—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating
- B23K20/12—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating the heat being generated by friction; Friction welding
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K20/00—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating
- B23K20/12—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating the heat being generated by friction; Friction welding
- B23K20/1215—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating the heat being generated by friction; Friction welding for other purposes than joining, e.g. built-up welding
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K28/00—Welding or cutting not covered by any of the preceding groups, e.g. electrolytic welding
- B23K28/02—Combined welding or cutting procedures or apparatus
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C27/00—Alloys based on rhenium or a refractory metal not mentioned in groups C22C14/00 or C22C16/00
- C22C27/04—Alloys based on tungsten or molybdenum
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C24/00—Coating starting from inorganic powder
- C23C24/08—Coating starting from inorganic powder by application of heat or pressure and heat
- C23C24/10—Coating starting from inorganic powder by application of heat or pressure and heat with intermediate formation of a liquid phase in the layer
- C23C24/103—Coating with metallic material, i.e. metals or metal alloys, optionally comprising hard particles, e.g. oxides, carbides or nitrides
- C23C24/106—Coating with metal alloys or metal elements only
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Abstract
The invention discloses a preparation method of a composite reinforced aluminum alloy, which comprises the following steps of firstly, pretreating the surface of an aluminum plate to obtain a clean aluminum plate; and then cladding a powder cladding layer on the aluminum plate, then carrying out fixed clamping, setting welding parameters, and preparing an aluminum alloy surface strengthening layer by a friction stir processing technology to obtain the composite strengthened aluminum alloy. According to the invention, the dual functions of friction heat and stirring force of the stirring head in the stirring friction processing process are utilized, so that an in-situ reaction process is generated between the reinforced material and the aluminum substrate, a reinforced layer is obtained within the range of 0-2 mm on the surface of the aluminum substrate, the reinforced layer generated by the in-situ reaction is well combined with the substrate, a good reinforcing effect can be achieved, and the preparation of the reinforced layer on the surface of the aluminum substrate is successfully realized.
Description
Technical Field
The invention belongs to the technical field of aluminum alloy surface strengthening, and particularly relates to a preparation method of a composite strengthened aluminum alloy.
Background
Aluminum and aluminum alloy have the advantages of small density, high specific strength, good electrical and thermal conductivity and the like, are widely used in industrial production, and are the most widely used non-ferrous metal materials at present. However, aluminum and aluminum alloys have low hardness and poor wear resistance, and the application range of the aluminum and aluminum alloys is greatly limited. How to improve the surface hardness and the wear resistance of the aluminum alloy is a key technology for widening the application range of the aluminum and the aluminum alloy and exerting the advantages and the characteristics of the aluminum and the aluminum alloy. Considering that the abrasion action usually only occurs on the surface of the component, the strengthening particles are only added to the surface of the alloy to form the particle reinforced aluminum-based surface composite material layer, so that the hardness and the abrasion resistance of the surface of the aluminum matrix can be improved on the premise of keeping good toughness and ductility in the aluminum matrix. At present, the main preparation method of the aluminum-based surface strengthening layer comprises the following steps: thermal spraying, cold spraying, vapor deposition, laser cladding, friction stir processing and the like, and the methods all belong to the technical field of surface engineering. Laser cladding is one of the widely used surface modification techniques, which uses a high-energy laser beam as a heat source to rapidly heat the powder and the substrate surface to melt them and form a cladding layer with special properties. The main difficulty of obtaining a composite material with good performance by taking aluminum alloy as a matrix through laser cladding is as follows: the thermal expansion coefficient of the aluminum alloy is greatly different from that of the ceramic particles, the thermal expansion coefficient of the aluminum alloy and the ceramic particles are not consistent in shrinkage in the preparation process, and large residual stress is generated at a joint to crack. The friction stir processing is a research hotspot of a novel material preparation method which becomes a surface composite material, and the method utilizes a stirring head rotating at a high speed to compound reinforcing particles preset on the surface of a plate with an aluminum matrix under the combined action of high temperature and severe plastic deformation to form a surface composite material layer. However, the conventional methods of punching, grooving and the like add non-deformable particles to carry out FSP (free space plasma) preparation of the aluminum-based surface composite layer, and have the problems that hard particles are easy to extrude, the distribution of a reinforcing phase is not uniform, and the bonding of the reinforcing phase and an Al matrix is not good.
Disclosure of Invention
The invention aims to provide a preparation method of an aluminum alloy surface strengthening layer, which solves the problems of large stress and easy cracking of the aluminum alloy surface strengthening layer prepared in the prior art.
The technical scheme adopted by the invention is that the preparation method of the composite reinforced aluminum alloy comprises the following specific operation steps:
step 1, polishing the surface of an aluminum plate by using abrasive paper, removing an oxide film, then cleaning by using an acetone solution, and drying for later use after cleaning;
step 2, uniformly mixing Mo powder, Fe powder, Ni powder and Co powder in a mass ratio of 13-15: 3-5: 1 in a mixer, and then mixing the mixed powder into pasty slurry by using a polyvinyl alcohol solution with the mass concentration of 5%;
step 3, coating the slurry on the aluminum plate treated in the step 1, and drying the coated aluminum plate in a drying box to obtain a prefabricated reinforcement aluminum plate; carrying out laser cladding on a slurry layer on the surface of the prefabricated reinforcement aluminum plate to obtain a cladding aluminum plate with the surface covered by a cladding layer with the thickness of 200-300 microns;
and 4, step 4: setting up milling machine processing parameters to carry out friction stir processing on the surface of the cladding aluminum plate, wherein the processing parameters are as follows: the rotation speed is 600-1180 r/min, the advancing speed is 60-150 mm/min, the inclination angle is 0 degrees, a milling machine is started, a stirring pin of a stirring head is slowly pressed into a cladding layer area subjected to laser cladding at a constant speed, the pressing amount is 0.2mm, the processing is kept for 4-5 s, and the processing is started until the surface of a cladding layer aluminum plate is completely processed; repeating the processing steps for 1-6 times to enable the cladding layer to be crushed in the aluminum plate, and obtaining a composite reinforced layer 0-2 mm deep from the surface of the aluminum plate, namely obtaining the composite reinforced aluminum alloy.
The present invention is also characterized in that,
step 2, the rotating speed of the mixer is 90-110 r/min, and the mixing time is 0.8-1.2 h;
the method is characterized in that the solid content of the slurry in the step 2 is 50-60%.
And 3, the laser cladding process parameters are defocusing amount D equal to 5mm, pulse width tp equal to 7ms, peak power pm equal to 5k, frequency f equal to 8Hz, and scanning speed V equal to 4 mm/s.
And 3, drying at the drying temperature of 60 ℃ for 6-8 h.
The grain diameters of the Mo powder, the Fe powder, the Ni powder and the Co powder are all 30-50 mu m.
The invention has the beneficial effects that: the preparation method of the composite reinforced aluminum alloy provided by the invention is used for preparing the aluminum plate surface reinforcing layer by combining the laser cladding and friction stir processing technologies. According to the invention, a layer of reinforced material is prefabricated on the surface of an aluminum plate by a laser cladding technology, and an in-situ reaction process is carried out between the reinforced material and an aluminum substrate by utilizing the dual functions of friction heat and stirring force of a stirring head in a stirring friction processing process, so that a reinforced layer is obtained within the depth range of 0-2 mm on the surface of the aluminum plate, and the reinforced layer generated by the in-situ reaction is well combined with the aluminum plate substrate, so that a good reinforcing effect can be achieved, and the preparation of the aluminum-based surface reinforced layer is successfully realized.
Drawings
FIG. 1 is a schematic view of a laser cladding process of the present invention;
FIG. 2 is a schematic illustration of the friction stir processing of the present invention;
FIG. 3 is a schematic view of the mixing head of the present invention;
FIG. 4 is a mirror image of the surface reinforcing layer of the reinforced aluminum alloy of example 1.
Detailed Description
The present invention will be described in detail with reference to the following examples
Example 1
Step 1, polishing the surface of an aluminum plate by using abrasive paper, removing an oxide film, cleaning oil stains and polishing scraps on the surface of the aluminum plate by using an acetone solution, and drying for later use after cleaning;
step 2, uniformly mixing Mo powder, Fe powder, Ni powder and Co powder with the particle sizes of 30-50 mu m and the mass ratio of 14: 4: 1 in a mixer, rotating the mixer at 100r/min for 1h, and then mixing the mixed powder into pasty slurry with the solid content of 50% by using a polyvinyl alcohol solution with the mass concentration of 5%;
step 3, coating the slurry on the aluminum plate treated in the step 1, and drying the coated aluminum plate in a drying oven at 60 ℃ for 6 hours to obtain a prefabricated reinforcement aluminum plate; carrying out laser cladding on a slurry layer on the surface of the prefabricated reinforced aluminum plate, wherein the laser cladding process parameters are as follows: defocusing amount D is 5mm, pulse width tp is 7ms, peak power pm is 5k, frequency f is 8Hz, and scanning speed V is 4 mm/s; obtaining a cladding aluminum plate (as shown in figure 1) with the surface covered with a layer of cladding layer with the thickness of 200-300 mu m;
and 4, step 4: fixing the cladding aluminum plate on a workbench of a vertical milling machine in a clamping manner, and setting processing parameters to carry out friction stir processing on the cladding aluminum plate surface, wherein the milling machine processing parameters are as follows: the rotation speed is 600r/min, the advancing speed is 150mm/min, the inclination angle is 0 degree, a milling machine is started, a stirring pin of a stirring head is slowly pressed into a cladding layer area subjected to laser cladding at a constant speed, the pressing amount is 0.2mm, the pressing amount is kept for 4-5 s, and the processing is started; stopping until the surface of the cladding aluminum plate is completely processed; repeating the processing steps for 2 times to enable the cladding layer to be crushed and react with the aluminum matrix, and obtaining a composite strengthening layer (shown in figure 2) at the depth of 0-2 mm on the surface;
and 5: and (3) after the reinforced aluminum alloy is completely cooled, removing the clamp, taking out the processed material, and cleaning the surface of the reinforced aluminum alloy to obtain the surface-reinforced aluminum-based composite material.
Example 2
Step 1, polishing the surface of an aluminum plate by using abrasive paper, removing an oxide film, cleaning oil stains and polishing scraps on the surface of the aluminum plate by using an acetone solution, and drying for later use after cleaning;
step 2, uniformly mixing Mo powder, Fe powder, Ni powder and Co powder with the particle sizes of 30-50 mu m and the mass ratio of 13: 5: 1 in a mixer, rotating the mixer at 100r/min for 1h, and then mixing the mixed powder into pasty slurry with the solid content of 60% by using a polyvinyl alcohol solution with the mass concentration of 5%;
step 3, coating the slurry on the aluminum plate treated in the step 1, and drying the coated aluminum plate in a drying oven at 60 ℃ for 8 hours to obtain a prefabricated reinforcement aluminum plate; carrying out laser cladding on a slurry layer on the surface of the prefabricated reinforced aluminum plate, wherein the laser cladding process parameters are as follows: defocusing amount D is 5mm, pulse width tp is 7ms, peak power pm is 5k, frequency f is 8Hz, and scanning speed V is 4 mm/s; obtaining a cladding layer aluminum plate with the surface covered by a layer of cladding layer with the thickness of 200-300 mu m;
and 4, step 4: fixing the cladding aluminum plate on a workbench of a vertical milling machine in a clamping manner, and setting processing parameters to carry out friction stir processing on the cladding aluminum plate surface, wherein the milling machine processing parameters are as follows: rotating at 1180r/min, advancing at 60mm/min, and inclining at 0 degree, starting a milling machine, slowly pressing a stirring pin of a stirring head into a cladding layer area subjected to laser cladding at a constant speed, keeping the pressing amount at 0.2mm for 4-5 s, and starting processing; stopping until the surface of the cladding aluminum plate is completely processed; repeating the processing steps for 4 times to enable the cladding layer to be crushed and react with the aluminum matrix, and obtaining a composite strengthening layer at the depth of 0-2 mm on the surface;
and 5: and (3) after the reinforced aluminum alloy is completely cooled, removing the clamp, taking out the processed material, and cleaning the surface of the reinforced aluminum alloy to obtain the surface-reinforced aluminum-based composite material.
Example 3
Step 1, polishing the surface of an aluminum plate by using abrasive paper, removing an oxide film, cleaning oil stains and polishing scraps on the surface of the aluminum plate by using an acetone solution, and drying for later use after cleaning;
step 2, uniformly mixing Mo powder, Fe powder, Ni powder and Co powder with the particle sizes of 30-50 mu m and the mass ratio of 14: 4: 1 in a mixer, wherein the rotating speed of the mixer is 90r/min, the mixing time is 0.8h, and then mixing the mixed powder into pasty slurry with the solid content of 55% by using 5% by mass of polyvinyl alcohol solution;
step 3, coating the slurry on the aluminum plate treated in the step 1, and drying the coated aluminum plate in a drying oven at 60 ℃ for 7 hours to obtain a prefabricated reinforcement aluminum plate; carrying out laser cladding on a slurry layer on the surface of the prefabricated reinforced aluminum plate, wherein the laser cladding process parameters are as follows: defocusing amount D is 5mm, pulse width tp is 7ms, peak power pm is 5k, frequency f is 8Hz, and scanning speed V is 4 mm/s; obtaining a cladding layer aluminum plate with the surface covered by a layer of cladding layer with the thickness of 200-300 mu m;
and 4, step 4: fixing the cladding aluminum plate on a workbench of a vertical milling machine in a clamping manner, and setting processing parameters to carry out friction stir processing on the cladding aluminum plate surface, wherein the milling machine processing parameters are as follows: rotating at a speed of 950r/min, advancing at a speed of 118mm/min, and inclining at 0 degree, starting a milling machine, slowly pressing a stirring pin of a stirring head into a cladding layer area subjected to laser cladding at a constant speed, keeping the pressing amount at 0.2mm for 4-5 s, and starting processing; stopping until the surface of the cladding aluminum plate is completely processed; repeating the processing steps for 6 times to enable the cladding layer to be crushed and react with the aluminum matrix, and obtaining a composite reinforcing layer at the depth of 0-2 mm on the surface;
and 5: and (3) after the reinforced aluminum alloy is completely cooled, removing the clamp, taking out the processed material, and cleaning the surface of the reinforced aluminum alloy to obtain the surface-reinforced aluminum-based composite material.
Example 4
Step 1, polishing the surface of an aluminum plate by using abrasive paper, removing an oxide film, cleaning oil stains and polishing scraps on the surface of the aluminum plate by using an acetone solution, and drying for later use after cleaning;
step 2, uniformly mixing Mo powder, Fe powder, Ni powder and Co powder with the particle sizes of 30-50 mu m and the mass ratio of 13: 5: 1 in a mixer, wherein the rotating speed of the mixer is 110r/min, the mixing time is 1.2h, and then mixing the mixed powder into pasty slurry with the solid content of 60% by using a polyvinyl alcohol solution with the mass concentration of 5%;
step 3, coating the slurry on the aluminum plate treated in the step 1, and drying the coated aluminum plate in a drying oven at 60 ℃ for 8 hours to obtain a prefabricated reinforcement aluminum plate; carrying out laser cladding on a slurry layer on the surface of the prefabricated reinforced aluminum plate, wherein the laser cladding process parameters are as follows: defocusing amount D is 5mm, pulse width tp is 7ms, peak power pm is 5k, frequency f is 8Hz, and scanning speed V is 4 mm/s; obtaining a cladding layer aluminum plate with the surface covered by a layer of cladding layer with the thickness of 200-300 mu m;
and 4, step 4: fixing the cladding aluminum plate on a workbench of a vertical milling machine in a clamping manner, and setting processing parameters to carry out friction stir processing on the cladding aluminum plate surface, wherein the milling machine processing parameters are as follows: rotating at a speed of 950r/min, advancing at a speed of 95mm/min, and inclining at 0 degree, starting a milling machine, slowly pressing a stirring pin of a stirring head into a cladding layer area subjected to laser cladding at a constant speed, keeping the pressing amount at 0.2mm for 4-5 s, and starting processing; stopping until the surface of the cladding aluminum plate is completely processed; repeating the processing steps for 2 times to enable the cladding layer to be crushed and react with the aluminum matrix, and obtaining a composite strengthening layer at the depth of 0-2 mm on the surface;
and 5: and (3) after the reinforced aluminum alloy is completely cooled, removing the clamp, taking out the processed material, and cleaning the surface of the reinforced aluminum alloy to obtain the surface-reinforced aluminum-based composite material.
The stirring heads used in the embodiment of the application are the same stirring head, the stirring material is H13 hot work die steel, the structure is shown in figure 3, the stirring head comprises a cylindrical shaft shoulder, the diameter of the shaft shoulder is 20mm, a shaft sleeve is further sleeved in the middle of the shaft shoulder, the diameter of the shaft sleeve is larger than that of the shaft shoulder, a stirring pin with a trapezoidal cross section is fixed in the center of the lower end of the shaft shoulder, the diameter of the top of the stirring pin is 6mm, the diameter of the bottom of the stirring pin is 4mm, and the total length of the stirring pin is 3 mm; specific dimensions are shown in table 1.
In the example, the laser cladding layer of the aluminum plate is crushed, refined and embedded in the aluminum matrix under the thermal coupling effect of the stirring head, and the in-situ reaction is carried out between the laser cladding layer of the aluminum plate and the aluminum matrix, so that the laser cladding layer of the aluminum plate and the aluminum matrix not only have simple mechanical mixing effect, but also have in-situ reaction between the laser cladding layer of the aluminum plate and the aluminum matrix, the obtained strengthening layer and the matrix are well combined, and the hardness of the obtained aluminum alloy surface strengthening layer is improved by about 50% compared with that of the aluminum matrix. Can be widely applied to the industries of transportation, construction, chemical engineering and the like.
TABLE 1 concrete size of the mixing head (mm)
The composite reinforced aluminum alloy prepared by the method adopts a method combining laser cladding and friction stirring, a laser cladding layer material is extruded into the aluminum matrix in a friction stirring manner, reinforcing body particles consisting of Mo, Fe, Ni and Co are well fused into the aluminum matrix under high-temperature stirring, and the reinforcing body particles are uniformly distributed in the aluminum plate (as shown in figure 4) through stirring and extruding for many times, are well combined with the aluminum matrix, have small stress and are not easy to crack; the strength of the aluminum plate is greatly improved.
Claims (4)
1. The preparation method of the composite reinforced aluminum alloy is characterized by comprising the following specific operation steps:
step 1, polishing the surface of an aluminum plate by using abrasive paper, removing an oxide film, then cleaning by using an acetone solution, and drying for later use after cleaning;
step 2, uniformly mixing Mo powder, Fe powder, Ni powder and Co powder in a mass ratio of 13-15: 3-5: 1 in a mixer, and then mixing the mixed powder into pasty slurry with a polyvinyl alcohol solution with the mass concentration of 5%, wherein the solid content of the slurry is 50-60%;
step 3, coating the slurry on the aluminum plate treated in the step 1, and drying the coated aluminum plate in a drying box to obtain a prefabricated reinforcement aluminum plate; carrying out laser cladding on a slurry layer on the surface of the prefabricated reinforcement aluminum plate to obtain a cladding aluminum plate with the surface covered by a cladding layer with the thickness of 200-300 microns;
the laser cladding process parameters are defocusing amount D equal to 5mm, pulse width tp equal to 7ms, peak power pm equal to 5k, frequency f equal to 8Hz, and scanning speed V equal to 4 mm/s;
and 4, step 4: setting up milling machine processing parameters to carry out friction stir processing on the surface of the cladding aluminum plate, wherein the processing parameters are as follows: the rotating speed is 600-1180 r/min, the advancing speed is 60-150 mm/min, the inclination angle is 0 degree, a milling machine is started, a stirring pin of a stirring head is slowly pressed into a cladding layer area subjected to laser cladding at a constant speed, the pressing amount is 0.2mm, the pressing amount is kept for 4-5 s, and the processing is started; stopping until the surface of the cladding aluminum plate is completely processed; repeating the processing steps for 1-6 times to enable the cladding layer to be crushed in the aluminum plate, and obtaining a composite reinforced layer 0-2 mm deep from the surface of the aluminum plate, namely obtaining the composite reinforced aluminum alloy.
2. The method for preparing the composite reinforced aluminum alloy according to claim 1, wherein the mixer in the step 2 rotates at 90-110 r/min for 0.8-1.2 h.
3. The method for preparing the composite reinforced aluminum alloy according to claim 1, wherein the drying temperature in the step 3 is 60 ℃ and the drying time is 6-8 h.
4. The method for preparing the composite reinforced aluminum alloy according to claim 1, wherein the grain sizes of the Mo powder, the Fe powder, the Ni powder and the Co powder are all 30-50 μm.
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| CN110284084B (en) * | 2019-06-28 | 2021-09-28 | 江苏理工学院 | Plastic forming method for high-strength wear-resistant aluminum alloy plate |
| CN110396691B (en) * | 2019-08-27 | 2021-08-24 | 贵州大学 | 6061 aluminum alloy surface treatment method |
| CN111660007B (en) * | 2020-07-06 | 2021-11-12 | 天津工业大学 | High-strength wear-resistant corrosion-resistant aluminum/magnesium heterojunction and preparation method thereof |
| CN112571000B (en) * | 2020-12-21 | 2022-01-04 | 太原理工大学 | Processing and preparation method for coating stainless steel foil on surface of aluminum alloy plate |
| CN113001005B (en) * | 2021-02-05 | 2022-08-16 | 西安建筑科技大学 | Preparation method and device of metal plate |
| CN113249720B (en) * | 2021-06-08 | 2022-06-07 | 华侨大学 | Laser cladding coating equipment and method |
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| CN101012561A (en) * | 2007-02-01 | 2007-08-08 | 天津工业大学 | Aluminum alloy surface strengthening method using laser melting and coating |
| CN102936724A (en) * | 2012-11-23 | 2013-02-20 | 桂林电子科技大学 | Method for reinforcing nickel-base alloy layer on aluminum alloy surface |
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