CN115976375A - Aluminum alloy for solar cell panel frame and production method of section bar of aluminum alloy - Google Patents
Aluminum alloy for solar cell panel frame and production method of section bar of aluminum alloy Download PDFInfo
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- CN115976375A CN115976375A CN202211651284.1A CN202211651284A CN115976375A CN 115976375 A CN115976375 A CN 115976375A CN 202211651284 A CN202211651284 A CN 202211651284A CN 115976375 A CN115976375 A CN 115976375A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
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Abstract
An aluminum alloy for a solar cell panel frame and a production method of a section bar thereof are disclosed, wherein the aluminum alloy comprises the following components in percentage by mass: 0.59-0.64% of Si, 0.51-0.56% of Mg, 0.05-0.15% of Mn, 0.05-0.15% of Cr, 0.02-0.03% of Ti, 0.004-0.006% of B, less than or equal to 0.2% of Fe, and the balance of Al and inevitable impurity elements, wherein the mass percentage of Si and Mg satisfies: si is more than or equal to Mg/1.73+0.3, and the sum of the mass percentages of Mn and Cr is less than or equal to 0.2 percent. The production method of the section sequentially comprises the steps of material preparation, aluminum alloy liquid smelting, permanent magnet stirring, in-furnace injection refining, out-furnace online grain refinement and degassing filtration, semi-continuous casting, homogenization treatment, heating and extrusion, quenching, stretching and straightening and aging treatment. According to the invention, through scientific design of the composition of the aluminum alloy, the cleanliness of the aluminum alloy liquid is improved, the structure of the aluminum bar is refined and homogenized, the deformation resistance of the aluminum bar is reduced, the extrusion speed and the mechanical property of the aluminum profile are improved, the tensile strength of the aluminum profile is more than or equal to 260 MPa, the yield strength of the aluminum profile is more than or equal to 240 MPa, and the elongation after fracture is more than or equal to 12%, the requirements of the solar cell panel frame on high-strength aluminum profiles in light and thin development are met.
Description
Technical Field
The invention belongs to the technical field of aluminum alloy preparation, and particularly relates to an aluminum alloy for a solar cell panel frame and a production method of a section bar of the aluminum alloy.
Background
Solar panels are important components of solar photovoltaic power generation. With the implementation of the carbon-peak carbon-neutral two-carbon policy, the demand for solar panels has seen explosive growth in recent years. The frame of the solar cell panel plays a role in fixing and supporting the solar cell panel. In order to improve the safety and the service life of the solar cell panel and reduce the manufacturing cost of the solar cell panel, the frame of the solar cell panel gradually develops to be light and thin, the wall thickness of the aluminum profile used is thinner and thinner, and therefore the strength of the aluminum profile needs to be improved. The existing solar cell panel frame is mainly formed by processing a 6063 aluminum alloy section, and although the 6063 aluminum alloy has good extrusion performance, the strength is low, the frame is easy to deform in the using process, and the requirement of light and thin development of the solar cell panel is difficult to meet.
The Chinese patent application with publication number CN112375941A discloses a solar frame aluminum alloy section and a processing technology thereof, wherein the aluminum alloy section comprises the following components in percentage by mass: si 0.55-0.66%, fe 0.15-0.20%, cu 0.16-0.21%, mn 0.02-0.05%, mg 0.55-0.60%, cr 0.15-0.20%, and balancing aluminum. The tensile strength of the head part of the 6063 aluminum alloy section is 280 MPa, the yield strength is 260 MPa, the elongation is 12.7 percent, the tensile strength of the tail part is 265 MPa, the yield strength is 249 MPa, and the elongation is 11.1 percent.
The Chinese patent application with the publication number of CN109628807A discloses a high-performance low-adsorption particle solar frame aluminum profile which comprises the following components in percentage by mass: 0.05-0.15% of Fe, 0.35-0.45% of Si, 0.5-0.6% of Mg, 0.1-0.15% of Cu, 0.15-0.25% of Zn, 0.05-0.1% of Mn, 0.05-0.07% of Ti, 0.03-0.05% of B, 0.05-0.15% of Cr, 0.01-0.03% of Er, 0.04-0.06% of Zr, 0.02-0.04% of V and the balance of Al. The invention reduces the generation of 'adsorption particles' on the surface of the aluminum profile, but the mechanical property of the aluminum profile is still lower, the tensile strength is less than or equal to 191 MPa, the yield strength is less than or equal to 149 MPa, and the elongation is less than or equal to 13.1%.
The chinese patent application with publication number CN111996423A discloses an aluminum alloy profile for a solar photovoltaic frame and a preparation method thereof, wherein the aluminum alloy profile consists of the following alloy elements in percentage by mass: 0.5-0.9% of Si, 0.4-0.8% of Mg, 0.15-0.25% of Fe, 0.015-0.025% of Ti, less than 0.08% of Cu, less than 0.08% of Mn, less than 0.10% of Zn, and the balance of Al, wherein the total amount is 100%, and the sum of the mass percentages of Cu and Mn is 0.08-0.16%. The aluminum alloy section has the tensile strength of 244-258 MPa, the yield strength of 233-238 MPa, the elongation of 12.5-13.9 percent and the Vickers hardness of 14.5-15.5. The strength of the aluminium alloy profile is still low.
Chinese patent application publication No. CN102719715A discloses an aluminum alloy and a manufacturing method thereof for manufacturing a solar frame aluminum profile, wherein the aluminum alloy comprises the following components by mass: 0.62 to 0.65 percent of Mg, 0.08 percent of Cu, 0.43 to 0.46 percent of Si, 0.06 percent of Zn, 0.04 percent of Mn, less than 0.18 percent of Fe when being more than 0, 0.04 percent of Cr, 0.06 percent of Ti and the balance of Al. Although the application of the patent improves the extrusion speed of the aluminum profile, the mechanical property of the aluminum profile is still lower.
From the production practice and the document data retrieval result, the strength of the aluminum alloy for the solar cell panel frame is still low at present, and the requirement of the solar cell panel frame for light and thin development is difficult to meet. In addition, the strength of the aluminum alloy is improved, the extrusion speed of the aluminum profile is reduced, the production efficiency is reduced, the production cost is increased, and the huge demand of the rapid development of the solar photovoltaic power generation industry on the solar cell panel frame aluminum profile is difficult to meet. Therefore, the existing aluminum alloy for solar cell panel frames and the production method of the section thereof still need to be improved and developed.
Disclosure of Invention
The invention aims to solve the problems and the defects, and provides the aluminum alloy for the solar cell panel frame and the production method of the section bar of the aluminum alloy.
The technical scheme of the invention is realized as follows:
the invention provides an aluminum alloy for a solar cell panel frame, which is characterized by comprising the following components in percentage by mass: 0.59-0.64% of Si, 0.51-0.56% of Mg, 0.05-0.15% of Mn, 0.05-0.15% of Cr, 0.02-0.03% of Ti, 0.004-0.006% of B, less than or equal to 0.2% of Fe, the balance of Al and inevitable impurity elements, wherein the single content of the inevitable impurity elements is less than or equal to 0.05%, and the total content of the inevitable impurity elements is less than or equal to 0.15%.
The main role of Si and Mg is to enhance the strength of the aluminum alloy. Si and Mg may form Mg 2 The Si strengthening phase significantly enhances the strength of the aluminum alloy. The contents of Si and Mg cannot be too low, and the strength of the aluminum alloy may be insufficient. The contents of Si and Mg are not too high, and the strength of the aluminum alloy is too high, so that the extrusion speed is difficult to increase. In addition, si forms Mg in addition to Mg 2 In addition to the Si strengthening phase, intermetallic compounds are formed with Fe, consuming part of Si. Therefore, in order to obtain a sufficient amount of Mg 2 The Si reinforcing phase, and the ratio of Si to Mg must be strictly controlled. Preferably, the mass percentage of Si and Mg satisfies: si is more than or equal to Mg/1.73+0.3.
The aluminum alloy also contains trace Mn and Cr elements. Preferably, the sum of the mass percentages of Mn and Cr satisfies Mn + Cr ≦ 0.2%.
The growth of recrystallized grains occurs in the extrusion process of the aluminum alloy, a coarse grain structure is formed, and the strength and the plasticity of the aluminum alloy are seriously reduced. In order to prevent the occurrence of coarse grain structure, the inventors have surprisingly found through experimental studies that the Mn and Cr elements are added in a compound manner in trace amounts, and form MnAl in the aluminum alloy 6 、CrAl 7 、(Cr,Mn)Al 12 Equal particles capable of inhibiting dislocation glide and grain boundary migrationPreventing the growth of crystal grains and improving the strength and plasticity of the aluminum alloy. If the addition amounts of Mn and Cr are not too low, the growth of crystal grains cannot be suppressed. The total addition amount of Mn and Cr is not too high, and a coarse intermetallic compound is easily formed, so that the deformation resistance of the aluminum alloy and the extrusion difficulty of the aluminum alloy are increased. Therefore, the sum of the mass percentages of Mn and Cr in the invention is set as follows: mn + Cr is less than or equal to 0.2 percent.
The Ti and the B are added into the aluminum alloy liquid in the form of Al5Ti1B alloy rods, and mainly have the functions of refining grains of the aluminum alloy round rod, improving the uniformity of structural components of the aluminum alloy round rod, reducing the deformation resistance of the aluminum alloy round rod, and improving the extrusion speed and the production efficiency of the aluminum alloy. The contents of Ti and B cannot be too low, otherwise the grain-refining effect is not significant. The content of Ti and B is too high, which does not increase the grain refining effect remarkably, but increases the production cost. Therefore, the mass percent of Ti is 0.02-0.03%, and the mass percent of B is 0.004-0.006%.
Fe is an inevitable impurity element in the aluminum alloy. Fe can form thick needle-like and flaky Fe-rich phases in the aluminum alloy, so that the extrusion difficulty of the aluminum alloy is increased, an aluminum matrix can be cut, the coarse needle-like and flaky Fe-rich phases become crack sources and crack propagation directions of the aluminum alloy, and the strength and the plasticity of the aluminum alloy are seriously damaged. Therefore, in order to increase the extrusion rate and obtain high-strength aluminum alloy, the Fe content must be strictly controlled to be less than or equal to 0.2%.
The invention provides a production method of an aluminum profile for a solar cell panel frame, which is characterized by sequentially comprising the following steps of:
(1) Selecting an aluminum source, a silicon source, a magnesium source, a manganese source and a chromium source as raw materials according to the component composition and mass percentage of the aluminum alloy to carry out batching;
(2) Adding the raw materials into a heat accumulating type fuel gas aluminum melting furnace, heating and melting the raw materials into aluminum alloy liquid at 720-760 ℃, and then starting a permanent magnetic stirring device to stir the aluminum alloy liquid in the furnace;
(3) Blowing, refining, degassing and removing impurities of aluminum alloy liquid in an aluminum melting furnace by using inert gas and a refining agent, slagging off and then standing for a period of time;
(4) Introducing the aluminum alloy liquid into a launder, and then adding Al5Ti1B alloy rods accounting for 0.4-0.6% of the total weight of the raw materials for online grain refinement treatment;
(5) Enabling the aluminum alloy liquid to sequentially flow through a degassing box and a filtering box which are arranged on a launder to carry out online degassing and filtering treatment;
(6) Semi-continuously casting the aluminum alloy liquid into an aluminum alloy round bar under the conditions that the temperature is 680-720 ℃ and the casting speed is 100-200 mm/min;
(7) Heating the aluminum alloy round bar to 590-600 ℃, and preserving heat for 10-12 hours to carry out homogenization treatment;
(8) Heating the aluminum alloy round bar to 520-540 ℃, extruding the aluminum alloy round bar into an aluminum profile, and then spraying water mist to cool the aluminum profile to room temperature;
(9) And stretching and straightening the aluminum profile, then heating to 210-220 ℃, preserving heat for 3-4 hours, carrying out aging treatment, and cooling to obtain the aluminum profile for the solar cell panel frame.
In the step (1), the raw materials can be pure metals, alloys, process wastes generated in the production process of aluminum alloys or recycled waste metals and the like, as long as the components of the aluminum alloys can meet the requirements and the impurity elements do not exceed the standard. Preferably, the aluminum source is an aluminum ingot with the purity of more than or equal to 99.7%, the magnesium source is a magnesium ingot with the purity of more than or equal to 99.8%, the silicon source is aluminum-silicon alloy, the manganese source is aluminum-manganese alloy, and the chromium source is aluminum-chromium alloy.
In the step (2), in order to improve the uniformity of the composition of the aluminum alloy liquid, it is necessary to enhance the stirring of the aluminum alloy liquid in the aluminum melting furnace. Preferably, a heat accumulating type gas aluminum melting furnace with a permanent magnet stirring device is selected, after raw materials are melted into aluminum alloy liquid, the permanent magnet stirring device is started, the aluminum alloy liquid is stirred for 15-25 minutes in a circulation mode of forward rotation for 5 minutes and then reverse rotation for 5 minutes, and segregation of components of the aluminum alloy liquid can be prevented. The raw materials are low in heating and melting temperature, the melting speed is low, and the production efficiency is low. The melting temperature is high, and although the melting speed is high, the burning loss of the raw material is increased. Preferably, the melting temperature is 720-760 ℃. In addition, after melting and stirring, the components of the aluminum alloy liquid need to be detected on site, and if the components are unqualified, the aluminum alloy liquid needs to be supplemented until the components of the aluminum alloy liquid are qualified.
In the step (3), in order to improve the purity of the aluminum alloy liquid, refining, degassing and impurity removal of the aluminum alloy liquid in the aluminum melting furnace are required to be enhanced. Preferably, argon with the purity of more than or equal to 99.99 percent and a refining agent accounting for 0.2 to 0.4 percent of the total weight of the raw materials are selected to carry out blowing refining on the aluminum alloy liquid. The blowing refining time is not short enough or long enough, and preferably 15-25 minutes. Still, it is necessary to stand the aluminum alloy liquid for a certain time after refining so that the sufficient separation time of the bubbles and inclusions remaining in the aluminum alloy liquid is obtained, and preferably, the standing time is 30 to 60 minutes.
In the step (3), preferably, the refining agent consists of the following components in percentage by mass: mgCl 2 30-45%，KCl 25-40%，KBF 4 5-10%，K 2 ZrF 6 5-10%，SrCO 3 6-8%，LiCl 3-5%，BaCl 2 2 to 4 percent. And the refining agent is obtained by remelting, and specifically, the refining agent is heated in a vacuum furnace with the vacuum degree of 10-20Pa for 1-2 hours at 900-1100 ℃ for remelting, and after cooling and solidification, crushing and screening are carried out to obtain the refining agent with the particle size of less than or equal to 2 mm.
The air holes and the inclusions can cut the aluminum matrix, the structural continuity of the aluminum alloy is damaged, the strength and the plasticity of the aluminum alloy are reduced, the deformation resistance is increased, and the extrusion difficulty is increased. The existing refining agent is obtained by directly mixing raw materials, and although the method is simple and low in cost, the interaction among the components of the refining agent is not fully exerted, which is also an important reason for low efficiency of degassing and impurity removal of the existing refining agent. In addition, the existing refining agent also commonly contains a large amount of villiaumite, nitrate, sulfate, hexachloroethane and the like, and a large amount of irritant and unpleasant smoke gas such as hydrogen fluoride, sulfur dioxide and the like is produced in the refining process, so that the environmental pollution and the harm to the human health are caused.
In order to improve the cleanliness of aluminum alloy liquid in a furnace, reduce the deformation resistance of the aluminum alloy and improve the strength and the plasticity of the aluminum alloy, the inventor develops a more efficient and environment-friendly remelting refining agent through a large amount of experimental research, and the components of the refining agent can be fused and crystallized with each other through high-temperature remelting to reduce the content of aluminum alloyThe melting point of the refining agent is low, so that the refining agent is easier to melt in the aluminum alloy liquid. Meanwhile, the components of the refining agent can generate mutually promoted physical and chemical actions, so that the refining agent has higher degassing and impurity removing efficiency. Such as MgCl 2 Has a melting point of 712 deg.C, a melting point of KCl of 770 deg.C, and MgCl after remelting the refining agent at high temperature 2 And KCl can form MgCl with melting point lower than 500 deg.C 2 KCl eutectic, which remarkably reduces the melting temperature of the refining agent, enables the refining agent to be easier to melt in aluminum alloy liquid, and produces better degassing and impurity removing effects.
Wherein, mgCl 2 And KCl is the main component of the refining agent, mgCl 2 KCl and aluminum alloy liquid react to generate AlCl with the boiling point of only 182.7 DEG C 3 ，AlCl 3 The bubbles can adsorb partial hydrogen and impurities in the aluminum alloy liquid floating process, so that the effects of degassing, removing impurities and purifying are achieved. Partial MgCl 2 And KCl is directly decomposed under the thermal action of high-temperature aluminum alloy liquid to release Cl + Ions, cl + Ions react with hydrogen in the aluminum alloy liquid to generate HCl gas, HCl bubbles further adsorb and take away impurities in the process of overflowing the aluminum alloy liquid, and the efficient degassing, impurity removal and purification effects are achieved.
K 2 ZrF 6 And KBF 4 Can react with aluminum alloy liquid to generate KAlF 4 、K 3 AlF 6 And ZrB 2 Reaction to give KAlF 4 And K 3 AlF 6 Is in molten salt state, has large surface tension, is not infiltrated with aluminum alloy liquid, and is suitable for Al 2 O 3 The oxide inclusions have good dissolving and wetting effects, and can promote Al 2 O 3 And the separation of oxide inclusions and aluminum alloy liquid is carried out, so that the impurity removal and purification effects are improved. ZrB as a by-product obtained by the reaction 2 The aluminum alloy liquid can be used as a heterogeneous nucleation core when the aluminum alloy liquid is solidified, the effect of refining crystal grains is achieved, the aluminum alloy round bar with finer and more uniform crystal grains can be obtained, and the deformation resistance of the aluminum alloy round bar is reduced.
Fe is an inevitable impurity element in aluminum alloys, in which Al is usually used 3 Fe、FeSiAl 3 、Fe 2 SiAl 8 、Fe 2 Si 2 Al 9 、Fe 3 Si 2 Al 12 The existence of coarse needle-shaped or flake Fe-rich phase can not only damage the strength and plasticity of the aluminum alloy, but also obviously increase the deformation resistance of the aluminum alloy round bar and reduce the extrusion speed. In order to improve the degassing and impurity removing efficiency of the refining agent and eliminate the harm of coarse Fe-rich phases, the inventor finds that a small amount of SrCO is added into the refining agent after a great deal of experimental research 3 LiCl and BaCl 2 ，SrCO 3 CO can be decomposed in high-temperature aluminum alloy liquid 2 LiCl and BaCl 2 Can react in aluminum alloy liquid to generate AlCl with the boiling point of only 183 DEG C 3 ，CO 2 And AlCl 3 The bubbles can absorb and take away hydrogen and Al in the floating process 2 O 3 And the impurities are removed by degassing. Sr, li and Ba elements obtained by reaction enter the aluminum alloy liquid, and the thick Fe-rich phase is refined and modified in the aluminum alloy solidification process, so that the thick needle-like or sheet-like Fe-rich phase is converted into fine particles and is dispersed and distributed in the aluminum matrix, the harm of the thick Fe-rich phase can be eliminated, the deformation resistance of the aluminum alloy round bar is reduced, and the extrusion performance of the aluminum alloy round bar and the strength and plasticity of the aluminum profile are improved.
In the step (4), in order to improve the structural component uniformity of the aluminum alloy round bar and improve the extrusion processing performance of the aluminum bar, the aluminum alloy liquid needs to be subjected to grain refinement treatment. The grain refiner can be aluminum-titanium-boron alloy, aluminum-titanium-carbon alloy, and the like. Preferably, the grain refiner is Al5Ti1B alloy rod, the addition amount is 0.4-0.6% of the total weight of the raw materials, and the grain refiner is added into the aluminum alloy liquid on a runner before semi-continuous casting, so that the best grain refining effect can be achieved.
In the step (5), the aluminum matrix is cracked by the pores and the impurities, so that the plasticity and the extrusion speed of the aluminum alloy round bar are reduced. In order to further improve the purity of the aluminum alloy liquid, the aluminum alloy liquid before casting needs to be subjected to online degassing and filtering treatment, namely the aluminum alloy liquid sequentially flows through a degassing tank and a filtering tank which are arranged on a flow groove, and high-cleanness aluminum alloy liquid is obtained through online degassing and filtering treatment, so that the plasticity of the aluminum alloy round bar is improved. Preferably, the rotation speed of the graphite rotor in the degassing box is 500-600 revolutions per minute, the gas flow is 1.5-2.5 cubic meters per hour, the gas pressure is 0.35-0.45MPa, the gas is a mixed gas consisting of argon with the purity of more than or equal to 99.99% and chlorine with the purity of more than or equal to 99.99%, the volume percentage of the chlorine is 1-5%, and two foamed ceramic filter plates with the front 50 meshes and the rear 80 meshes are arranged in the filter box.
In the step (6), in order to obtain high-quality aluminum alloy round bars and prevent casting accidents, strict adherence to the operating rules of semi-continuous casting and strict control of technological parameters of semi-continuous casting are required. The diameter of the aluminum alloy round bar is small, the casting speed can be higher, the diameter of the aluminum alloy round bar is large, and the casting speed is lower. The temperature of the casting machine cooling water cannot exceed 50 ℃. Preferably, the temperature of the aluminum alloy liquid is 680-720 ℃, the speed of the semi-continuous casting is 100-200 mm/min, and the temperature of the cooling water of the semi-continuous casting machine is 20-40 ℃.
In the step (7), the aluminum alloy round bar is homogenized for the purpose of eliminating element segregation of the aluminum alloy round bar, melting coarse second-phase compounds, eliminating stress of the aluminum alloy round bar and improving extrusion performance of the aluminum alloy round bar. Too low a homogenization temperature or too short a time may result in incomplete homogenization treatment. Too high a homogenizing temperature can cause the aluminum alloy round bar to be over-burnt, and the extrusion performance and the mechanical property of the aluminum alloy are deteriorated. Preferably, the homogenizing temperature of the aluminum alloy round bar is 590-600 ℃, and the homogenizing time is 10-12 hours.
In the step (8), due to the fact that trace Mn and Cr elements are added to the aluminum alloy in a compounding mode, growth of crystal grains can be effectively inhibited, meanwhile, the aluminum alloy round bar has lower deformation resistance, extrusion can be conducted at higher temperature and higher speed, production efficiency is improved, and meanwhile, the aluminum alloy round bar cannot cause coarse grains to be generated on the aluminum profile. Preferably, the heating temperature of the aluminum alloy round bar is 520-540 ℃, the machine temperature of the extrusion die is 480-500 ℃, and the advancing speed of the extrusion rod is 25-35 mm/s. The extruded aluminum profile can be cooled by air, water spray, water mist combined cooling, water trough water penetration cooling and the like. In order to increase the cooling rate while avoiding deformation, it is preferable to use water mist cooling.
In the step (9), the cooled aluminum profile needs to be stretched and straightened, the deformation of the stretching and straightening is not too small or too large, and the aluminum profile cannot obtain the required size. Preferably, the amount of deformation for stretch straightening is 1 to 3%. The aging treatment is an important process for improving the strength of the aluminum profile, and after a great deal of experimental research on the aging process of the aluminum profile, the inventor finds that the aluminum profile with the highest strength can be obtained by heating the aluminum profile to 210-220 ℃, preserving the heat for 3-4 hours for aging, and then cooling the aluminum profile to room temperature along with a furnace or air cooling, and the heating time is obviously shortened, thereby being beneficial to improving the production efficiency, reducing the production cost and improving the market competitiveness. The aging temperature is higher than 220 ℃, the aging time is longer than 4 hours, or the aging temperature is lower than 210 ℃ or the aging time is shorter than 3 hours, and the aluminum profile with the required strength cannot be obtained.
Compared with the prior art, the invention has the following beneficial effects:
(1) The invention reduces the deformation resistance of the aluminum alloy round bar, greatly improves the extrusion speed and the production efficiency of the aluminum profile and solves the contradiction problem between the strength and the extrusion production efficiency by scientifically designing the composition of the aluminum alloy, improving the cleanliness of the aluminum alloy liquid, and refining and homogenizing the tissue composition of the aluminum alloy round bar;
(2) The refining agent developed and used by the invention has higher degassing and impurity removing effects, has refining, modifying and modifying effects on the aluminum alloy, can reduce the deformation resistance of the aluminum alloy, and improves the extrusion performance and the mechanical performance. The refining agent contains less villiaumite, does not contain nitrate, sulfate, hexachloroethane and the like, and is more environment-friendly to use;
(3) The tensile strength of the aluminum profile is more than or equal to 260 MPa, the yield strength is more than or equal to 240 MPa, the elongation after fracture is more than or equal to 12%, the Brinell hardness is more than or equal to 85, compared with 6063 aluminum profile, the strength is improved by 15%, the plasticity is improved by 30%, the strength and the plasticity are higher, and the strength requirement of the frame of the solar cell panel on the aluminum profile in light and thin development is met.
Drawings
FIG. 1 is a photograph of the grain structure of the cross section of the aluminum profile of example 1 of the present invention.
Fig. 2 is a photograph of the grain structure on the cross section of the aluminum profile of example 2 of the present invention.
FIG. 3 is a photograph of the grain structure of the cross section of the aluminum profile of example 3 of the present invention.
FIG. 4 is a photograph of the grain structure of the cross section of the aluminum profile of example 4 of the present invention.
Detailed Description
Example 1:
the aluminum alloy provided by the invention comprises the following components in percentage by mass: 0.61% of Si, 0.53% of Mg, 0.09% of Mn, 0.08% of Cr, 0.025% of Ti, 0.005% of B, less than or equal to 0.2% of Fe, and the balance of Al and inevitable impurity elements, wherein the content of the inevitable impurity elements is less than or equal to 0.05% individually, and the total content of the inevitable impurity elements is less than or equal to 0.15%. The method for producing the aluminum profile for the solar cell panel frame by adopting the aluminum alloy sequentially comprises the following steps: (1) According to the composition and mass percentage of the aluminum alloy, selecting an aluminum ingot with the purity of 99.7 percent, a magnesium ingot with the purity of 99.8 percent, an aluminum-silicon alloy, an aluminum-manganese alloy and an aluminum-chromium alloy as raw materials for proportioning; (2) Adding the raw materials into a heat accumulating type gas aluminum melting furnace, heating and melting the raw materials into aluminum alloy liquid at 740 ℃, then starting a permanent magnetic stirring device, and stirring the aluminum alloy liquid for 20 minutes by adopting a circulation mode of forward rotation for 5 minutes and then reverse rotation for 5 minutes; (3) The method comprises the following steps of blowing and refining aluminum alloy liquid in an aluminum melting furnace for 20 minutes by using argon with the purity of 99.99% and a refining agent accounting for 0.3% of the total weight of raw materials, slagging off and standing for 45 minutes, wherein the refining agent comprises the following components in percentage by mass: mgCl 2 40.3%，KCl 34.1%，KBF 4 6.3%，K 2 ZrF 6 6.5%，SrCO 3 7.1%，LiCl 3.3%，BaCl 2 2.4%, the refining agent is obtained by remelting: drying and dehydrating a refining agent, heating the refining agent for 1.5 hours at 1000 ℃ in a vacuum furnace with the vacuum degree of 15 Pa, cooling and solidifying the refining agent, and crushing and screening the refining agent to obtain the refining agent with the particle size of less than or equal to 2 mm; (4) Introducing the aluminum alloy liquid into a launder, and then adding an Al5Ti1B alloy rod accounting for 0.5 percent of the total weight of the raw materials for online grain refinement treatment; (5) Aluminum alloy liquid sequentially flows through a degassing box which is arranged on a launder and provided with a graphite rotor with the rotating speed of 550 revolutions per minute, the gas flow of 2 cubic meters per hour and the gas pressure of 0.4MPa, and two foamed ceramics with the front 50 meshes and the rear 80 meshesThe filter box of the porcelain filter plate is subjected to online degassing and filtering treatment, the gas is a mixed gas consisting of argon with the purity of 99.99 percent and chlorine with the purity of 99.99 percent, and the volume percentage of the chlorine is 2.5 percent; (6) Semi-continuously casting aluminum alloy liquid into an aluminum alloy round bar under the conditions that the temperature is 700 ℃ and the casting speed is 150 mm/min; (7) Heating the aluminum alloy round bar to 595 ℃, and preserving heat for 11 hours to carry out homogenization treatment; (8) Heating an aluminum alloy round bar to 530 ℃, extruding the aluminum alloy round bar into an aluminum profile under the conditions that the machine temperature of a die is 490 ℃ and the pushing speed of an extrusion rod is 30 mm/s, and then spraying water mist to cool the aluminum profile to room temperature; (9) And stretching and straightening the aluminum profile, heating to 215 ℃, preserving heat for 3.5 hours, carrying out aging treatment, and cooling to obtain the aluminum profile for the solar cell panel frame.
Example 2:
the aluminum alloy provided by the invention comprises the following components in percentage by mass: 0.59% of Si, 0.51% of Mg, 0.12% of Mn, 0.06% of Cr, 0.02% of Ti, 0.004% of B, less than or equal to 0.2% of Fe, and the balance of Al and inevitable impurity elements, wherein the single content of the inevitable impurity elements is less than or equal to 0.05%, and the total content of the impurity elements is less than or equal to 0.15%. The method for producing the aluminum profile for the solar cell panel frame by adopting the aluminum alloy sequentially comprises the following steps: (1) According to the composition and mass percentage of the aluminum alloy, selecting an aluminum ingot with the purity of 99.7 percent, a magnesium ingot with the purity of 99.8 percent, an aluminum-silicon alloy, an aluminum-manganese alloy and an aluminum-chromium alloy as raw materials for proportioning; (2) Adding the raw materials into a heat accumulating type gas aluminum melting furnace, heating and melting the raw materials into aluminum alloy liquid at 760 ℃, then starting a permanent magnetic stirring device, and stirring the aluminum alloy liquid for 25 minutes by adopting a circulation mode of forward rotation for 5 minutes and then reverse rotation for 5 minutes; (3) Blowing and refining aluminum alloy liquid in an aluminum melting furnace for 25 minutes by using argon with the purity of 99.99 percent and a refining agent accounting for 0.4 percent of the total weight of raw materials, slagging off and standing for 30 minutes, wherein the refining agent comprises the following components in percentage by mass: mgCl 2 30.2%，KCl 39.8%，KBF 4 7.3%，K 2 ZrF 6 9.9%，SrCO 3 6.1%，LiCl 3.4%，BaCl 2 3.3 percent, and the refining agent is obtained by remelting: specifically, the refining agent is dried and dehydrated, and then heated for 1 hour at 1100 ℃ in a vacuum furnace with the vacuum degree of 10 PaThen, crushing and screening after cooling and solidification to obtain the refining agent with the grain size of less than or equal to 2 mm; (4) Introducing the aluminum alloy liquid into a launder, and then adding an Al5Ti1B alloy rod accounting for 0.4 percent of the total weight of the raw materials for online grain refinement treatment; (5) Enabling the aluminum alloy liquid to sequentially flow through a degassing box which is arranged on a launder and has a graphite rotor rotating speed of 600 revolutions per minute, a gas flow of 1.5 cubic meters per hour and a gas pressure of 0.35MPa and a filter box which is provided with two foamed ceramic filter plates of the front 50 meshes and the rear 80 meshes for online degassing and filtering treatment, wherein the gas is a mixed gas consisting of argon with the purity of 99.99 percent and chlorine with the purity of 99.99 percent, and the volume percentage of the chlorine is 1 percent; (6) Semi-continuously casting aluminum alloy liquid into an aluminum alloy round bar under the conditions that the temperature is 720 ℃ and the casting speed is 100 mm/min; (7) Heating the aluminum alloy round bar to 600 ℃, and preserving heat for 10 hours to carry out homogenization treatment; (8) Heating an aluminum alloy round bar to 540 ℃, extruding the aluminum alloy round bar into an aluminum profile under the conditions that the machine temperature of a die is 500 ℃ and the pushing speed of an extrusion rod is 35 mm/s, and then spraying water mist to cool the aluminum profile to room temperature; (9) And stretching and straightening the aluminum profile, heating to 210 ℃, preserving heat for 4 hours, carrying out aging treatment, and cooling to obtain the aluminum profile for the solar cell panel frame.
Example 3:
the aluminum alloy provided by the invention comprises the following components in percentage by mass: 0.64 percent of Si, 0.56 percent of Mg, 0.08 percent of Mn, 0.12 percent of Cr, 0.03 percent of Ti, 0.006 percent of B, less than or equal to 0.2 percent of Fe, the balance of Al and inevitable impurity elements, wherein the single content of the inevitable impurity elements is less than or equal to 0.05 percent, and the total content of the inevitable impurity elements is less than or equal to 0.15 percent. The method for producing the aluminum profile for the solar cell panel frame by adopting the aluminum alloy sequentially comprises the following steps: (1) According to the composition and mass percentage of the aluminum alloy, selecting an aluminum ingot with the purity of 99.7 percent, a magnesium ingot with the purity of 99.8 percent, an aluminum-silicon alloy, an aluminum-manganese alloy and an aluminum-chromium alloy as raw materials for proportioning; (2) Adding raw materials into a heat accumulating type gas aluminum melting furnace, heating and melting the raw materials into aluminum alloy liquid at 720 ℃, then starting a permanent magnetic stirring device, and stirring the aluminum alloy liquid for 15 minutes by adopting a circulation mode of forward rotation for 5 minutes and then reverse rotation for 5 minutes; (3) Argon with the purity of 99.99 percent and argon accounting for 0.2 percent of the total weight of the raw materials are usedThe refining agent is used for blowing and refining aluminum alloy liquid in an aluminum melting furnace for 15 minutes, and standing for 60 minutes after slagging off, wherein the refining agent comprises the following components in percentage by mass: mgCl 2 44.8%，KCl 25.2%，KBF 4 5.3%，K 2 ZrF 6 5.1%，SrCO 3 6.7%，LiCl 3.9%，BaCl 2 2.0%, the refining agent is obtained by remelting: drying and dehydrating a refining agent, heating for 2 hours at 900 ℃ in a vacuum furnace with the vacuum degree of 20Pa, cooling, solidifying, crushing and screening to obtain the refining agent with the particle size of less than or equal to 2 millimeters; (4) Introducing the aluminum alloy liquid into a launder, and then adding an Al5Ti1B alloy rod accounting for 0.6 percent of the total weight of the raw materials for online grain refinement treatment; (5) Enabling the aluminum alloy liquid to sequentially flow through a degassing box which is arranged on a launder and has the rotation speed of a graphite rotor of 500 revolutions per minute, the gas flow of 2.5 cubic meters per hour and the gas pressure of 0.45MPa and a filter box which is provided with two foamed ceramic filter plates of the front 50 meshes and the rear 80 meshes to carry out online degassing and filtering treatment, wherein the gas is a mixed gas consisting of argon with the purity of 99.99 percent and chlorine with the purity of 99.99 percent, and the volume percentage of the chlorine is 5 percent; (6) Semi-continuously casting the aluminum alloy liquid into an aluminum alloy round bar under the conditions that the temperature is 680 ℃ and the casting speed is 200 mm/min; (7) Heating the aluminum alloy round bar to 590 ℃, and preserving heat for 12 hours to carry out homogenization treatment; (8) Heating an aluminum alloy round bar to 520 ℃, extruding the aluminum alloy round bar into an aluminum profile under the conditions that the on-machine temperature of a die is 480 ℃ and the pushing speed of an extrusion rod is 25 mm/s, and then spraying water mist to cool the aluminum profile to room temperature; (9) And stretching and straightening the aluminum profile, heating to 220 ℃, preserving heat for 3 hours, carrying out aging treatment, and cooling to obtain the aluminum profile for the solar cell panel frame.
Example 4:
the aluminum alloy provided by the invention comprises the following components in percentage by mass: 0.62 percent of Si, 0.55 percent of Mg, 0.05 percent of Mn, 0.15 percent of Cr, 0.025 percent of Ti, 0.005 percent of B, less than or equal to 0.2 percent of Fe, the balance of Al and inevitable impurity elements, wherein the single content of the inevitable impurity elements is less than or equal to 0.05 percent, and the total content of the impurity elements is less than or equal to 0.15 percent. The method for producing the aluminum profile for the solar cell panel frame by adopting the aluminum alloy sequentially comprises the following steps: (1) According to the composition of aluminium alloySelecting aluminum ingots with the purity of 99.7 percent, magnesium ingots with the purity of 99.8 percent, aluminum-silicon alloy, aluminum-manganese alloy and aluminum-chromium alloy as raw materials to be proportioned according to the mass percentage; (2) Adding the raw materials into a heat accumulating type gas aluminum melting furnace, heating and melting the raw materials into aluminum alloy liquid at 730 ℃, then starting a permanent magnetic stirring device, and stirring the aluminum alloy liquid for 20 minutes by adopting a circulation mode of forward rotation for 5 minutes and then reverse rotation for 5 minutes; (3) The method comprises the following steps of blowing and refining aluminum alloy liquid in an aluminum melting furnace for 20 minutes by using argon with the purity of 99.99% and a refining agent accounting for 0.3% of the total weight of raw materials, slagging off and standing for 50 minutes, wherein the refining agent comprises the following components in percentage by mass: mgCl 2 35.2%，KCl 35.8%，KBF 4 5.3%，K 2 ZrF 6 8.9%，SrCO 3 7.1%，LiCl 4.4%，BaCl 2 3.3 percent, and the refining agent is obtained by remelting: drying and dehydrating a refining agent, heating the refining agent in a vacuum furnace with the vacuum degree of 18 Pa at 950 ℃ for 1.6 hours, cooling and solidifying the refining agent, and crushing and screening the refining agent to obtain the refining agent with the particle size of less than or equal to 2 mm; (4) Introducing the aluminum alloy liquid into a launder, and then adding an Al5Ti1B alloy rod accounting for 0.5 percent of the total weight of the raw materials for online grain refinement treatment; (5) Enabling the aluminum alloy liquid to sequentially flow through a degassing box which is arranged on a launder and has a graphite rotor rotating speed of 580 revolutions per minute, a gas flow rate of 1.9 cubic meters per hour and a gas pressure of 0.38MPa and a filter box which is provided with two foamed ceramic filter plates of the front 50 meshes and the rear 80 meshes to carry out online degassing and filtering treatment, wherein the gas is a mixed gas consisting of argon with the purity of 99.99 percent and chlorine with the purity of 99.99 percent, and the volume percentage of the chlorine is 4 percent; (6) Semi-continuously casting the aluminum alloy liquid into an aluminum alloy round bar under the conditions that the temperature is 690 ℃ and the casting speed is 170 mm/min; (7) Heating the aluminum alloy round bar to 595 ℃, and preserving heat for 11 hours to carry out homogenization treatment; (8) Heating an aluminum alloy round bar to 530 ℃, extruding the aluminum alloy round bar into an aluminum profile under the conditions that the machine temperature of a die is 495 ℃ and the pushing speed of an extrusion rod is 30 mm/s, and then spraying water mist to cool the aluminum profile to room temperature; (9) And stretching and straightening the aluminum profile, heating to 215 ℃, preserving heat for 3.5 hours, carrying out aging treatment, and cooling to obtain the aluminum profile for the solar cell panel frame.
Verification example 1:
the hydrogen content and slag content of the aluminum alloy liquid before semi-continuous casting in examples 1 to 4 were measured on site by an HDA-V hydrogen meter and an Analyze PoDFA slag meter, and the results are shown in Table 1. As can be seen from Table 1, the aluminum alloy liquids of examples 1 to 4 had a hydrogen content of less than 0.12 ml/100gAl and a slag content of less than 0.09 mm 2 (iv) kg. The hydrogen content of the aluminum alloy liquid before the semi-continuous casting is usually higher than 0.17 ml/100gAl and the slag content is higher than 0.15 mm under the condition that the adding amount of the refining agent is the same by adopting the existing refining agent to blow and refine the aluminum alloy liquid in the furnace 2 In terms of/kg. The refining agent has higher efficiency of degassing and impurity removal, can obviously reduce the content of gas slag in the aluminum alloy liquid, is beneficial to reducing the deformation resistance of the aluminum alloy round bar, and improves the extrusion speed of the aluminum alloy round bar and the mechanical property of the aluminum profile.
TABLE 1 examples 1-4 hydrogen content and slag content of aluminum alloy liquid
| Example 1 | Example 2 | Example 3 | Example 4 | |
| Hydrogen content/(ml/100 gAl) | 0.112 | 0.105 | 0.119 | 0.108 |
| Slag content/(mm) 2 /kg) | 0.086 | 0.082 | 0.087 | 0.083 |
Verification example 2:
samples were taken from the aluminum profiles of examples 1 to 4, and after grinding, polishing and etching, the grain structure on the cross section of the aluminum profile was observed under an optical microscope, fig. 1 is the grain structure on the cross section of the aluminum profile of example 1, fig. 2 is the grain structure on the cross section of the aluminum profile of example 2, fig. 3 is the grain structure on the cross section of the aluminum profile of example 3, and fig. 4 is the grain structure on the cross section of the aluminum profile of example 4. As can be seen from fig. 1-4, the aluminum profiles are fine uniform equiaxed grain structures in cross section. The invention can prevent the growth of recrystallized grains of the extruded aluminum alloy by scientifically designing the composition and the extrusion production process of the aluminum alloy, obtain the aluminum profile with fine and uniform grains, and is beneficial to improving the strength and the plasticity of the aluminum profile.
Verification example 3:
samples were taken from the aluminum profiles of examples 1 to 4, processed into standard tensile specimens, and then subjected to room-temperature stretching in an electronic tensile testing machine at a stretching rate of 2mm/min, and the tensile strength, yield strength and elongation after fracture of the aluminum profiles were measured, and the results are shown in Table 2. The results of the brinell hardness test using a brinell hardness tester are shown in table 2. As can be seen from Table 2, the tensile strength of the aluminum profiles of examples 1-4 is 260 MPa or more, the yield strength is 240 MPa or more, the elongation after fracture is 12% or more, and the Brinell hardness is 85% or more. The tensile strength of the 6063 aluminum profile for the frame of the solar cell panel is generally lower than 230 MPa, the yield strength is lower than 210 MPa, the elongation after fracture is lower than 9 percent, and the Brinell hardness is lower than 75. Compared with the prior art, the aluminum profile has the advantages that the strength is improved by 15%, the plasticity is improved by more than 30%, the aluminum profile has higher strength and plasticity, and the requirement of the frame of the solar cell panel on high-strength aluminum profiles in the development of lightness and thinness is met.
Table 2 mechanical properties of the aluminium profiles of examples 1-4
| Example 1 | Example 2 | Example 3 | Example 4 | |
| Tensile strength/MPa | 268.7 | 263.8 | 274.9 | 271.5 |
| Yield strength/MPa | 244.4 | 240.6 | 248.5 | 246.9 |
| Elongation after break/% | 12.9 | 13.1 | 12.3 | 12.4 |
| Brinell hardness HB | 87.4 | 85.9 | 90.5 | 88.9 |
While the present invention has been described by way of examples, and not by way of limitation, other variations of the disclosed embodiments can be devised by those skilled in the art in light of the foregoing description of the invention, and such variations are intended to be within the scope of the invention as defined by the appended claims.
Claims (10)
1. The aluminum alloy for the solar cell panel frame is characterized by comprising the following components in percentage by mass: 0.59-0.64% of Si, 0.51-0.56% of Mg, 0.05-0.15% of Mn, 0.05-0.15% of Cr, 0.02-0.03% of Ti, 0.004-0.006% of B, less than or equal to 0.2% of Fe, the balance of Al and inevitable impurity elements, wherein the single content of the inevitable impurity elements is less than or equal to 0.05%, and the total content of the inevitable impurity elements is less than or equal to 0.15%.
2. The aluminum alloy for the solar panel frame according to claim 1, wherein the mass percentage of Si to Mg satisfies the following conditions: si is more than or equal to Mg/1.73+0.3, and the sum of the mass percentages of Mn and Cr satisfies: mn + Cr is less than or equal to 0.2 percent.
3. A production method of an aluminum profile for solar cell panel frames, the aluminum profile produced by the method adopts the aluminum profile for solar cell panel frames as claimed in claims 1-2, and is characterized by sequentially comprising the following steps:
(1) Selecting an aluminum source, a silicon source, a magnesium source, a manganese source and a chromium source as raw materials according to the component composition and mass percentage of the aluminum alloy for mixing;
(2) Adding the raw materials into a heat accumulating type fuel gas aluminum melting furnace, heating and melting the raw materials into aluminum alloy liquid at 720-760 ℃, and then starting a permanent magnetic stirring device to stir the aluminum alloy liquid in the furnace;
(3) Blowing, refining, degassing and removing impurities of aluminum alloy liquid in an aluminum melting furnace by using inert gas and a refining agent, slagging off and then standing for a period of time;
(4) Introducing the aluminum alloy liquid into a launder, and then adding an Al5Ti1B alloy rod accounting for 0.4-0.6% of the total weight of the raw materials for online grain refinement treatment;
(5) Enabling the aluminum alloy liquid to sequentially flow through a degassing box and a filtering box which are arranged on a launder to carry out online degassing and filtering treatment;
(6) Semi-continuously casting the aluminum alloy liquid into an aluminum alloy round bar under the conditions that the temperature is 680-720 ℃ and the casting speed is 100-200 mm/min;
(7) Heating the aluminum alloy round bar to 590-600 ℃, and preserving heat for 10-12 hours to carry out homogenization treatment;
(8) Heating the aluminum alloy round bar to 520-540 ℃, extruding the aluminum alloy round bar into an aluminum profile, and then spraying water mist to cool the aluminum profile to room temperature;
(9) And stretching and straightening the aluminum profile, heating to 210-220 ℃, preserving heat for 3-4 hours, carrying out aging treatment, and cooling to obtain the aluminum profile for the solar cell panel frame.
4. The production method of the aluminum profile for the solar cell panel frame according to claim 3, wherein in the step (1), the aluminum source is an aluminum ingot with a purity of not less than 99.7%, the magnesium source is a magnesium ingot with a purity of not less than 99.8%, the silicon source is an aluminum-silicon alloy, the manganese source is an aluminum-manganese alloy, and the chromium source is an aluminum-chromium alloy.
5. The production method of the aluminum profile for the solar cell panel frame as claimed in claim 3, wherein the step (2) of starting the permanent magnetic stirring device to stir the aluminum alloy liquid in the furnace is to stir the aluminum alloy liquid for 15-25 minutes in a circulation mode of forward rotation for 5 minutes and then reverse rotation for 5 minutes.
6. The production method of the aluminum profile for the solar panel frame as claimed in claim 3, wherein the inert gas in the step (3) is argon gas with a purity of not less than 99.99%, the amount of the refining agent is 0.2-0.4% of the total weight of the raw materials, the blowing refining time is 15-25 minutes, and the standing time is 30-60 minutes.
7. The production method of the aluminum profile for the solar panel frame as claimed in claim 3, wherein the refining agent in the step (3) comprises the following components in percentage by mass: mgCl 2 30-45%，KCl 25-40%，KBF 4 5-10%，K 2 ZrF 6 5-10%，SrCO 3 6-8%，LiCl 3-5%，BaCl 2 2-4%。
8. The production method of the aluminum profile for the solar panel frame as claimed in claim 3 or 7, wherein the refining agent is obtained by remelting, specifically, the refining agent is heated in a vacuum furnace with a vacuum degree of 10-20Pa at 900-1100 ℃ for 1-2 hours for remelting, and after cooling and solidification, the refining agent with a particle size of less than or equal to 2mm is obtained by crushing and screening.
9. The production method of the aluminum profile for the solar cell panel frame as claimed in claim 3, wherein in the step (5), the rotation speed of the graphite rotor in the degassing box is 500-600 rpm, the gas flow is 1.5-2.5 cubic meters per hour, the gas pressure is 0.35-0.45MPa, the gas is a mixed gas consisting of argon with the purity of more than or equal to 99.99% and chlorine with the purity of more than or equal to 99.99%, the volume percentage of the chlorine is 1-5%, and two foamed ceramic filter plates with the first 50 meshes and the second 80 meshes are arranged in the filter box.
10. The production method of the aluminum profile for the solar cell panel frame according to claim 3, wherein the temperature of the die used for extrusion in the step (8) is 480-500 ℃, and the pushing speed of the extrusion rod is 25-35 mm/s.
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Effective date of registration: 20240612 Address after: No. 97 Kaiyuan Avenue, Huangpu District, Guangzhou City, Guangdong Province, 510700 Applicant after: Industrial analysis and testing center of Guangdong Academy of Sciences Country or region after: China Applicant after: Guangdong Kefeng Aluminum Technology Co.,Ltd. Address before: No. 363, Changxing Road, Tianhe District, Guangzhou, Guangdong 510630 Applicant before: Industrial analysis and testing center of Guangdong Academy of Sciences Country or region before: China |