High-strength wear-resistant Al_Si_Cu aluminum alloy and preparation method thereof

Abstract

The application discloses a kind of high-strength wear-resistant Al_Si_Cu aluminum alloy, with the total mass of the high-strength wear-resistant Al_Si_Cu aluminum alloy being 100%, it includes 6.7-8.5wt% of Si;5.1-5.5wt% of Cu;0.3-0.7wt% of Mn;0.06-0.12wt% of Ti;0.15-0.27wt% of Cr;1.1-1.5wt% of Zr;1.6-2.2wt% of Nb;0.5-1.3wt% of B;0.8-1.5wt% of N;2.6-3.6wt% of C;the balance of Al;The raw material of the preparation of B includes hexagonal boron nitride;The raw material of the preparation of N includes hexagonal boron nitride;The raw material of the preparation of C includes polyethyl acrylate.The high-strength wear-resistant Al_Si_Cu aluminum alloy provided by the application is excellent in tensile strength, yield strength and elongation due to the simultaneous presence of Nb (niobium), B (boron) prepared from hexagonal boron nitride, N (nitrogen) and C prepared from polyethyl acrylate.

Description

Technical Field

[0001] This invention relates to the field of metallic materials technology, and more specifically, to a high-strength, wear-resistant Al-Si-Cu aluminum alloy and its preparation method. Background Technology

[0002] With the continuous development of passenger vehicles, pistons in locomotives, as one of the key components, require alloys with low density, low coefficient of thermal expansion, good thermal conductivity, good friction reduction and wear resistance, and excellent mechanical properties to ensure proper operation. Previously, 4A11 aluminum alloy was used; however, 4A11 generally has low strength and other poor properties, affecting piston lifespan. Therefore, it is necessary to develop a piston that can meet higher tensile strength requirements. Al-Si-Cu aluminum alloys have the characteristics of small crystallization temperature intervals, small linear shrinkage coefficients, good filling capacity, and low tendency to hot cracking and shrinkage porosity, making them the most widely used die-casting aluminum alloys. CN115522105A discloses a high-strength, wear-resistant Al-Si-Cu aluminum alloy and its preparation method; however, the tensile strength, yield strength, and elongation of the Al-Si-Cu aluminum alloy provided are still not excellent enough.

[0003] In summary, based on the applicant's extensive research, it has been found that existing Al-Si-Cu aluminum alloys in this field have insufficient tensile strength, yield strength, and elongation. Therefore, it is necessary to develop or improve a high-strength and wear-resistant Al-Si-Cu aluminum alloy and its preparation method. Summary of the Invention

[0004] Therefore, in order to address the shortcomings of existing Al-Si-Cu aluminum alloys in terms of tensile strength, yield strength, and elongation, this invention provides a high-strength, wear-resistant Al-Si-Cu aluminum alloy and its preparation method. The specific technical solution is as follows:

[0005] A high-strength, wear-resistant Al-Si-Cu aluminum alloy, comprising, by weight, 6.7–8.5 wt% Si; 5.1–5.5 wt% Cu; 0.3–0.7 wt% Mn; 0.06–0.12 wt% Ti; 0.15–0.27 wt% Cr; 1.1–1.5 wt% Zr; 1.6–2.2 wt% Nb; 0.5–1.3 wt% B; 0.8–1.5 wt% N; 2.6–3.6 wt% C; and the balance Al.

[0006] The raw materials for preparing B include hexagonal boron nitride;

[0007] The raw materials for preparing N include hexagonal boron nitride;

[0008] The raw material for the preparation of C includes ethyl polyacrylate.

[0009] Furthermore, the hexagonal boron nitride has an average particle size of 300–900 nm and a specific surface area of ​​7–11 m². 2 / g, with a bulk density of 1–3 g / cm³ 3 .

[0010] Furthermore, the density of the polyethyl acrylate is 0.8–1.1 g / cm³. 3 The boiling point of the polyethyl acrylate is 90-100℃.

[0011] This technical solution also provides a method for preparing a high-strength, wear-resistant Al-Si-Cu aluminum alloy, which includes the following steps:

[0012] Si, Cu, Mn, Ti, Cr, Zr, Nb, Al and hexagonal boron nitride are added to a ball mill and ball milled to obtain ball milled material;

[0013] Ethyl polyacrylate was added to acetone and stirred at 800–1000 r / min for 2.5–3.5 h. Then, the ball milling material was added and stirred at 1100–1200 r / min for 5.1–5.5 h. The mixture was then sonicated at 60–120 kHz for 2.3–2.7 h. The mixture was then transferred to a polytetrafluoroethylene liner and placed in a high-pressure reactor. The reactor was heated to 90–100 °C and subjected to a high-pressure reaction for 10–12 h. After the reaction was completed, the mixture was cooled to room temperature and then centrifuged and filtered to obtain a high-pressure aluminum alloy.

[0014] The high-pressure aluminum alloy is subjected to reduction treatment to obtain a reduced aluminum alloy;

[0015] The reduced aluminum alloy is then smelted to obtain a smelted aluminum alloy;

[0016] The smelted aluminum alloy is subjected to melt treatment to obtain a molten aluminum alloy;

[0017] The molten aluminum alloy is extruded to obtain an extruded aluminum alloy.

[0018] The extruded aluminum alloy is quenched to obtain the high-strength, wear-resistant Al-Si-Cu aluminum alloy. Further, the ball milling conditions are: rotation speed 90–105 r / min, motor power 2.1–2.5 KW, the grinding jar is made of stainless steel, the grinding balls are made of stainless steel, and the process is carried out under a nitrogen atmosphere.

[0019] Furthermore, the restoration process includes the following steps:

[0020] The high-pressure aluminum alloy was placed in hydrogen gas, and then the temperature was increased to 820-880°C at a rate of 15-25°C / min for 5.1-5.6 hours to reduce it. After the reaction was completed, hydrogen gas was continued to be introduced, and the temperature was reduced to room temperature at a rate of 5-15°C / min to obtain the reduced aluminum alloy.

[0021] Furthermore, the smelting process includes the following steps:

[0022] The reduced aluminum alloy is added to a smelting furnace, then heated to 710–760°C, and held for 6–12 hours to obtain the smelted aluminum alloy.

[0023] Furthermore, the melt treatment includes the following steps:

[0024] The molten aluminum alloy is simultaneously heated by ultrasonic and electromagnetic methods to obtain the molten aluminum alloy.

[0025] The frequency of the ultrasound is 60–120 kHz, and the frequency of the electromagnetic heating is 6–10 kHz.

[0026] Furthermore, the extrusion process includes the following steps:

[0027] The molten aluminum alloy is added into a preheated mold, then heated to 550-580°C, pressure is 420-480 MPa, and pressure is held for 20-40 seconds to obtain the extruded aluminum alloy.

[0028] Furthermore, the quenching process includes the following steps:

[0029] The extruded aluminum alloy was quenched in a 7-9 wt% sodium chloride solution at 16-18°C for 36-38 seconds and then dried to obtain the high-strength and wear-resistant Al-Si-Cu aluminum alloy.

[0030] The high-strength, wear-resistant Al-Si-Cu aluminum alloy provided by the above technical solution exhibits excellent tensile strength, yield strength, and elongation due to the simultaneous presence of Nb (niobium), B (boron) and N (nitrogen) prepared from hexagonal boron nitride, and C prepared from polyethyl acrylate. Specifically, niobium, along with other metals and hexagonal boron nitride, is uniformly intercalated after ball milling. Further, it reacts with polyethyl acrylate in acetone, utilizing the multifunctional groups of polyethyl acrylate, the hexagonal network layered structure of hexagonal boron nitride, and the exfoliation and reducing properties of acetone gas under high pressure and high temperature. This results in a more regular three-dimensional structure for the entire aluminum alloy. Furthermore, hydrogen reduction, ultrasonication, and electromagnetic heating enhance the toughness of the entire aluminum alloy, thus providing excellent tensile strength, yield strength, and elongation. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to its embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and do not limit the scope of protection of the invention.

[0032] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0033] One embodiment of the present invention discloses a high-strength, wear-resistant Al-Si-Cu aluminum alloy, which, by weight, comprises 6.7–8.5 wt% Si; 5.1–5.5 wt% Cu; 0.3–0.7 wt% Mn; 0.06–0.12 wt% Ti; 0.15–0.27 wt% Cr; 1.1–1.5 wt% Zr; 1.6–2.2 wt% Nb; 0.5–1.3 wt% B; 0.8–1.5 wt% N; 2.6–3.6 wt% C; and the balance Al.

[0034] The raw materials for preparing B include hexagonal boron nitride;

[0035] The raw materials for preparing N include hexagonal boron nitride;

[0036] The raw material for the preparation of C includes ethyl polyacrylate.

[0037] In one embodiment, the hexagonal boron nitride has an average particle size of 300–900 nm and a specific surface area of ​​7–11 m². 2 / g, with a bulk density of 1–3 g / cm³ 3 .

[0038] In one embodiment, the density of the polyethyl acrylate is 0.8–1.1 g / cm³. 3 The boiling point of the polyethyl acrylate is 90-100℃.

[0039] In one embodiment, this technical solution provides a method for preparing a high-strength, wear-resistant Al-Si-Cu aluminum alloy, which includes the following steps:

[0040] Si, Cu, Mn, Ti, Cr, Zr, Nb, Al and hexagonal boron nitride are added to a ball mill and ball milled to obtain ball milled material;

[0041] Ethyl polyacrylate was added to acetone and stirred at 800–1000 r / min for 2.5–3.5 h. Then, the ball milling material was added and stirred at 1100–1200 r / min for 5.1–5.5 h. The mixture was then sonicated at 60–120 kHz for 2.3–2.7 h. The mixture was then transferred to a polytetrafluoroethylene liner and placed in a high-pressure reactor. The reactor was heated to 90–100 °C and subjected to a high-pressure reaction for 10–12 h. After the reaction was completed, the mixture was cooled to room temperature and then centrifuged and filtered to obtain a high-pressure aluminum alloy.

[0042] The high-pressure aluminum alloy is subjected to reduction treatment to obtain a reduced aluminum alloy;

[0043] The reduced aluminum alloy is then smelted to obtain a smelted aluminum alloy;

[0044] The smelted aluminum alloy is subjected to melt treatment to obtain a molten aluminum alloy;

[0045] The molten aluminum alloy is extruded to obtain an extruded aluminum alloy.

[0046] The extruded aluminum alloy is quenched to obtain the high-strength and wear-resistant Al-Si-Cu aluminum alloy.

[0047] In one embodiment, the ball milling conditions are: rotation speed of 90-105 r / min, motor power of 2.1-2.5 KW, ball mill jar made of stainless steel, grinding balls made of stainless steel, and under a nitrogen atmosphere.

[0048] In one embodiment, the restoration process includes the following steps:

[0049] The high-pressure aluminum alloy was placed in hydrogen gas, and then the temperature was increased to 820-880°C at a rate of 15-25°C / min for 5.1-5.6 hours to reduce it. After the reaction was completed, hydrogen gas was continued to be introduced, and the temperature was reduced to room temperature at a rate of 5-15°C / min to obtain the reduced aluminum alloy.

[0050] In one embodiment, the smelting process includes the following steps:

[0051] The reduced aluminum alloy is added to a smelting furnace, then heated to 710–760°C, and held for 6–12 hours to obtain the smelted aluminum alloy.

[0052] In one embodiment, the melt processing includes the following steps:

[0053] The molten aluminum alloy is simultaneously heated by ultrasonic and electromagnetic methods to obtain the molten aluminum alloy.

[0054] The frequency of the ultrasound is 60–120 kHz, and the frequency of the electromagnetic heating is 6–10 kHz.

[0055] In one embodiment, the extrusion process includes the following steps:

[0056] The molten aluminum alloy is added into a preheated mold, then heated to 550-580°C, pressure is 420-480 MPa, and pressure is held for 20-40 seconds to obtain the extruded aluminum alloy.

[0057] In one embodiment, the quenching process includes the following steps:

[0058] The extruded aluminum alloy was quenched in a 7-9 wt% sodium chloride solution at 16-18°C for 36-38 seconds and then dried to obtain the high-strength and wear-resistant Al-Si-Cu aluminum alloy.

[0059] The implementation schemes of the present invention will now be described in detail with reference to specific embodiments.

[0060] Example 1:

[0061] The following components were weighed based on the total mass of the high-strength, wear-resistant Al-Si-Cu aluminum alloy: 7.6 wt% Si, 5.3 wt% Cu, 0.5 wt% Mn, 0.09 wt% Ti, 0.21 wt% Cr, 1.3 wt% Zr, 1.9 wt% Nb, 0.87 wt% B, 1.13 wt% N, 3.1 wt% C, and the balance Al. The average particle size was 600 nm, and the specific surface area was 9.16 m². 2 / g, with a bulk density of 2.3g / cm³. 3 Hexagonal boron nitride with a density of 0.91 g / cm³ 3 Ethyl polyacrylate with a boiling point of 99.5℃;

[0062] Si, Cu, Mn, Ti, Cr, Zr, Nb, Al, and hexagonal boron nitride were added to a ball mill with a motor power of 2.3 kW, a stainless steel jar, and stainless steel grinding balls. The mixture was ball-milled at 97 r / min under a nitrogen atmosphere to obtain a ball-milled material. Ethyl polyacrylate was added to acetone and stirred at 900 r / min for 3 hours. Then, the ball-milled material was added, and the mixture was stirred at 1150 r / min for 5.3 hours. The mixture was then sonicated at 80 kHz for 2.5 hours. The mixture was then transferred to a polytetrafluoroethylene liner and placed in a high-pressure reactor. The reactor was heated to 95°C and subjected to high-pressure reaction for 11 hours. After the reaction, the mixture was cooled to room temperature and then centrifuged and filtered to obtain a high-pressure aluminum alloy. The high-pressure aluminum alloy was then... The aluminum alloy was placed in hydrogen gas and then heated to 850℃ at a rate of 20℃ / min for 5.3 hours for reduction. After the reaction was completed, hydrogen gas was continued to be introduced and the temperature was lowered to room temperature at a rate of 10℃ / min to obtain a reduced aluminum alloy. The reduced aluminum alloy was added to a melting furnace and then heated to 730℃ and held for 8 hours to obtain a molten aluminum alloy. The molten aluminum alloy was simultaneously ultrasonically heated at a frequency of 80kHz and electromagnetically heated at a frequency of 8kHz to obtain a molten aluminum alloy. The molten aluminum alloy was added to a preheated mold and then heated to 570℃ at a pressure of 450MPa and held for 30 seconds to obtain an extruded aluminum alloy. The extruded aluminum alloy was quenched in an 8wt% sodium chloride solution at 17℃ for 37 seconds and then dried to obtain a high-strength and wear-resistant Al-Si-Cu aluminum alloy.

[0063] Example 2:

[0064] The rest of the parts are the same as in Example 1, except that the total mass of the high-strength and wear-resistant Al-Si-Cu aluminum alloy is 100%, including 1.6 wt% Nb.

[0065] Example 3:

[0066] The rest of the parts are the same as in Example 1, except that the total mass of the high-strength and wear-resistant Al-Si-Cu aluminum alloy is 100%, including 2.2 wt% Nb.

[0067] Comparative Example 1:

[0068] Weigh out the following components based on the total mass of the high-strength, wear-resistant Al-Si-Cu aluminum alloy: 7.6 wt% Si, 5.3 wt% Cu, 0.5 wt% Mn, 0.09 wt% Ti, 0.21 wt% Cr, 1.3 wt% Zr, 1.9 wt% Nb, 0.87 wt% B, 3.1 wt% C, and the balance Al. The weights of Si, Cu, Mn, Ti, Cr, Zr, Nb, Al, and B, with a density of 0.91 g / cm³, are as follows: 3 Ethyl polyacrylate with a boiling point of 99.5℃;

[0069] Si, Cu, Mn, Ti, Cr, Zr, Nb, Al, and B were added to a ball mill with a 2.3 kW motor, a stainless steel jar, and stainless steel grinding balls. The mixture was ball-milled at 97 r / min under a nitrogen atmosphere to obtain the milled material. Ethyl polyacrylate was added to acetone and stirred at 900 r / min for 3 hours. Then, the milled material was added, and the mixture was stirred at 1150 r / min for 5.3 hours. The mixture was then sonicated at 80 kHz for 2.5 hours. The mixture was then transferred to a polytetrafluoroethylene liner and placed in a high-pressure reactor. The reactor was heated to 95°C and subjected to high-pressure reaction for 11 hours. After the reaction, the mixture was cooled to room temperature, centrifuged, and filtered to obtain a high-pressure aluminum alloy. The above high-pressure aluminum alloy was then... The aluminum alloy was placed in hydrogen gas and then heated to 850°C at a rate of 20°C / min for 5.3 hours to reduce it. After the reaction was completed, hydrogen gas was continued to be introduced and the temperature was lowered to room temperature at a rate of 10°C / min to obtain a reduced aluminum alloy. The reduced aluminum alloy was added to a melting furnace and then heated to 730°C and held for 8 hours to obtain a molten aluminum alloy. The molten aluminum alloy was simultaneously ultrasonically heated at a frequency of 80 kHz and electromagnetically heated at a frequency of 8 kHz to obtain a molten aluminum alloy. The molten aluminum alloy was added to a preheated mold and then heated to 570°C at a pressure of 450 MPa and held for 30 seconds to obtain an extruded aluminum alloy. The extruded aluminum alloy was quenched in an 8 wt% sodium chloride solution at 17°C for 37 seconds and then dried to obtain an aluminum alloy.

[0070] Comparative Example 2:

[0071] Weigh out the following components based on the total mass of the high-strength, wear-resistant Al-Si-Cu aluminum alloy: 7.6 wt% Si, 5.3 wt% Cu, 0.5 wt% Mn, 0.09 wt% Ti, 0.21 wt% Cr, 1.3 wt% Zr, 1.9 wt% Nb, 3.1 wt% C, and the balance Al. The weights of Si, Cu, Mn, Ti, Cr, Zr, Nb, and Al are calculated to obtain a weight of 0.91 g / cm³. 3 Ethyl polyacrylate with a boiling point of 99.5℃;

[0072] Si, Cu, Mn, Ti, Cr, Zr, Nb, and Al were added to a ball mill with a 2.3 kW motor, a stainless steel jar, and stainless steel grinding balls. The mixture was ball-milled at 97 r / min under a nitrogen atmosphere to obtain the milled material. Ethyl polyacrylate was added to acetone and stirred at 900 r / min for 3 hours. Then, the milled material was added, and the mixture was stirred at 1150 r / min for 5.3 hours. The mixture was then sonicated at 80 kHz for 2.5 hours. The mixture was then transferred to a polytetrafluoroethylene liner and placed in a high-pressure reactor. The reactor was heated to 95°C and subjected to high-pressure reaction for 11 hours. After the reaction, the mixture was cooled to room temperature, centrifuged, and filtered to obtain a high-pressure aluminum alloy. The high-pressure... An aluminum alloy was placed in hydrogen gas and then heated to 850°C at a rate of 20°C / min for 5.3 hours to reduce it. After the reaction was completed, hydrogen gas was continued to be introduced, and the temperature was lowered to room temperature at a rate of 10°C / min to obtain a reduced aluminum alloy. The reduced aluminum alloy was added to a melting furnace and then heated to 730°C and held for 8 hours to obtain a molten aluminum alloy. The molten aluminum alloy was simultaneously ultrasonically heated at a frequency of 80 kHz and electromagnetically heated at a frequency of 8 kHz to obtain a molten aluminum alloy. The molten aluminum alloy was added to a preheated mold and then heated to 570°C at a pressure of 450 MPa and held for 30 seconds to obtain an extruded aluminum alloy. The extruded aluminum alloy was quenched in an 8 wt% sodium chloride solution at 17°C for 37 seconds and then dried to obtain an aluminum alloy.

[0073] Comparative Example 3:

[0074] The following components were weighed based on the total mass of the high-strength, wear-resistant Al-Si-Cu aluminum alloy: 7.6 wt% Si, 5.3 wt% Cu, 0.5 wt% Mn, 0.09 wt% Ti, 0.21 wt% Cr, 1.3 wt% Zr, 0.87 wt% B, 1.13 wt% N, 3.1 wt% C, and the balance Al. The average particle size was 600 nm, and the specific surface area was 9.16 m². 2 / g, with a bulk density of 2.3g / cm³. 3 Hexagonal boron nitride with a density of 0.91 g / cm³ 3 Ethyl polyacrylate with a boiling point of 99.5℃;

[0075] Si, Cu, Mn, Ti, Cr, Zr, Al, and hexagonal boron nitride were added to a ball mill with a motor power of 2.3 kW, a stainless steel jar, and stainless steel grinding balls. The mixture was ball-milled at 97 r / min under a nitrogen atmosphere to obtain the milled material. Ethyl polyacrylate was added to acetone and stirred at 900 r / min for 3 hours. Then, the milled material was added, and the mixture was stirred at 1150 r / min for 5.3 hours. The mixture was then sonicated at 80 kHz for 2.5 hours. The mixture was then transferred to a polytetrafluoroethylene liner and placed in a high-pressure reactor. The reactor was heated to 95°C and subjected to high-pressure reaction for 11 hours. After the reaction, the mixture was cooled to room temperature and then centrifuged and filtered to obtain a high-pressure aluminum alloy. High-pressure aluminum alloy was placed in hydrogen gas and then heated to 850℃ at a rate of 20℃ / min for 5.3 hours to reduce it. After the reaction was completed, hydrogen gas was continued to be introduced and the temperature was lowered to room temperature at a rate of 10℃ / min to obtain a reduced aluminum alloy. The reduced aluminum alloy was added to a melting furnace and then heated to 730℃ and held for 8 hours to obtain a molten aluminum alloy. The molten aluminum alloy was simultaneously ultrasonically heated at a frequency of 80kHz and electromagnetically heated at a frequency of 8kHz to obtain a molten aluminum alloy. The molten aluminum alloy was added to a preheated mold and then heated to 570℃ at a pressure of 450MPa and held for 30 seconds to obtain an extruded aluminum alloy. The extruded aluminum alloy was quenched in an 8wt% sodium chloride solution at 17℃ for 37 seconds and then dried to obtain an aluminum alloy.

[0076] Comparative Example 4:

[0077] Based on the total mass of the high-strength, wear-resistant Al-Si-Cu aluminum alloy as 100%, the following components were weighed: 7.6 wt% Si, 5.3 wt% Cu, 0.5 wt% Mn, 0.09 wt% Ti, 0.21 wt% Cr, 1.3 wt% Zr, 1.9 wt% Nb, 0.87 wt% B, 1.13 wt% N, and the balance Al. The alloy composition was as follows: Si, Cu, Mn, Ti, Cr, Zr, Nb, Al, with an average particle size of 600 nm and a specific surface area of ​​9.16 m². 2 / g, with a bulk density of 2.3g / cm³. 3 Hexagonal boron nitride;

[0078] Si, Cu, Mn, Ti, Cr, Zr, Nb, Al, and hexagonal boron nitride were added to a ball mill with a motor power of 2.3 kW, a stainless steel jar, and stainless steel grinding balls. The mixture was ball-milled at 97 r / min under a nitrogen atmosphere to obtain a ball-milled material. This ball-milled material was then added to acetone and stirred at 1150 r / min for 5.3 h, followed by ultrasonication at 80 kHz for 2.5 h. The mixture was then transferred to a polytetrafluoroethylene (PTFE) liner and placed in a high-pressure reactor. The reactor was heated to 95 °C and subjected to high-pressure reaction for 11 h. After the reaction, the mixture was cooled to room temperature and then centrifuged and filtered to obtain a high-pressure aluminum alloy. This high-pressure aluminum alloy was then placed in hydrogen gas... The aluminum alloy was reduced by heating to 850℃ at a rate of 20℃ / min for 5.3 hours. After the reaction was completed, hydrogen gas was continuously introduced, and the temperature was lowered to room temperature at a rate of 10℃ / min to obtain a reduced aluminum alloy. The reduced aluminum alloy was added to a melting furnace, heated to 730℃, and held for 8 hours to obtain a molten aluminum alloy. The molten aluminum alloy was simultaneously ultrasonically heated at a frequency of 80kHz and electromagnetically heated at a frequency of 8kHz to obtain a molten aluminum alloy. The molten aluminum alloy was added to a preheated mold, heated to 570℃, and held at a pressure of 450MPa for 30 seconds to obtain an extruded aluminum alloy. The extruded aluminum alloy was quenched in an 8wt% sodium chloride solution at 17℃ for 37 seconds and then dried to obtain an aluminum alloy.

[0079] Comparative Example 5:

[0080] The following components were weighed based on the total mass of the high-strength, wear-resistant Al-Si-Cu aluminum alloy: 7.6 wt% Si, 5.3 wt% Cu, 0.5 wt% Mn, 0.09 wt% Ti, 0.21 wt% Cr, 1.3 wt% Zr, 1.9 wt% Nb, 0.87 wt% B, 1.13 wt% N, 3.1 wt% C, and the balance Al. The average particle size was 600 nm, and the specific surface area was 9.16 m². 2 / g, with a bulk density of 2.3g / cm³. 3 Hexagonal boron nitride with a density of 0.91 g / cm³ 3 Ethyl polyacrylate with a boiling point of 99.5℃;

[0081] Si, Cu, Mn, Ti, Cr, Zr, Nb, Al, and hexagonal boron nitride were added to a ball mill with a motor power of 2.3 kW, a stainless steel jar, and stainless steel grinding balls. The mixture was ball-milled at 97 r / min under a nitrogen atmosphere to obtain the milled material. Polyethyl acrylate was added to acetone and stirred at 900 r / min for 3 hours. Then, the milled material was added, and the mixture was stirred at 1150 r / min for 5.3 hours. The mixture was then sonicated at 80 kHz for 2.5 hours, and finally transferred to a polytetrafluoroethylene (PTFE) container. The olefin liner was placed in a high-pressure reactor and heated to 95°C for a high-pressure reaction for 11 hours. After the reaction, it was cooled to room temperature and then centrifuged and filtered to obtain a high-pressure aluminum alloy. The high-pressure aluminum alloy was added to a melting furnace and heated to 730°C for 8 hours to obtain a molten aluminum alloy. The molten aluminum alloy was added to a preheated mold and heated to 570°C at a pressure of 450 MPa for 30 seconds to obtain an extruded aluminum alloy. The extruded aluminum alloy was quenched in an 8 wt% sodium chloride solution at 17°C for 37 seconds and then dried to obtain an aluminum alloy.

[0082] The aluminum alloys obtained in Examples 1-3 and Comparative Examples 1-5 were tested for tensile strength, yield strength and elongation. The test results are shown in Table 1.

[0083] Table 1:

[0084]

[0085]

[0086] As can be seen from Table 1, compared with Examples 1-3 and Comparative Examples 1-5, the high-strength and wear-resistant Al-Si-Cu aluminum alloys obtained in Examples 1-3 exhibit excellent tensile strength, yield strength, and elongation due to the simultaneous presence of Nb (niobium), B (boron) and N (nitrogen) prepared from hexagonal boron nitride, and C prepared from polyethyl acrylate. Specifically, after ball milling, niobium and other metals and hexagonal boron nitride are uniformly intercalated and distributed. Furthermore, the reaction with polyethyl acrylate in acetone utilizes the multifunctional groups of polyethyl acrylate, the hexagonal network layered structure of hexagonal boron nitride, and the exfoliation and reducing properties of acetone gas under high pressure and high temperature, resulting in a more regular three-dimensional structure for the entire aluminum alloy. Furthermore, through hydrogen reduction, ultrasonication, and electromagnetic heating, the entire aluminum alloy becomes more tough, thus possessing excellent tensile strength, yield strength, and elongation.

[0087] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0088] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A high-strength, wear-resistant Al-Si-Cu aluminum alloy, characterized in that, Based on the total mass of the high-strength and wear-resistant Al-Si-Cu aluminum alloy, it comprises 6.7~8.5wt% Si; 5.1~5.5wt% Cu; 0.3~0.7wt% Mn; 0.06~0.12wt% Ti; and 0.15~0.27wt% Cr. 1.1~1.5wt% Zr; 1.6–2.2 wt% Nb; 0.5–1.3 wt% B; 0.8–1.5 wt% N; 2.6–3.6 wt% C; balance Al; The raw materials for preparing B include hexagonal boron nitride; The raw materials for preparing N include hexagonal boron nitride; The raw materials for the preparation of C include ethyl polyacrylate; The high-strength, wear-resistant Al-Si-Cu aluminum alloy comprises the following steps: Si, Cu, Mn, Ti, Cr, Zr, Nb, Al and hexagonal boron nitride are added to a ball mill and ball milled to obtain ball milled material; Ethyl polyacrylate was added to acetone and stirred at 800-1000 r / min for 2.5-3.5 h. Then the ball milling material was added and stirred at 1100-1200 r / min for 5.1-5.5 h. The mixture was then sonicated at 60-120 kHz for 2.3-2.7 h. The mixture was then transferred to a polytetrafluoroethylene liner and placed in a high-pressure reactor. The temperature was raised to 90-100 °C and the mixture was subjected to a high-pressure reaction for 10-12 h. After the reaction was completed, the mixture was cooled to room temperature and then centrifuged and filtered to obtain a high-pressure aluminum alloy. The high-pressure aluminum alloy is subjected to a reduction treatment, which is as follows: the high-pressure aluminum alloy is placed in hydrogen gas, and then the temperature is increased to 820~880℃ at a rate of 15~25℃ / min for 5.1~5.6h. After the reaction is completed, hydrogen gas is continued to be introduced, and the temperature is cooled to room temperature at a rate of 5~15℃ / min to obtain the reduced aluminum alloy. The reduced aluminum alloy is then smelted to obtain a smelted aluminum alloy; The smelted aluminum alloy is subjected to melt treatment to obtain a molten aluminum alloy; The molten aluminum alloy is extruded to obtain an extruded aluminum alloy. The extruded aluminum alloy is quenched to obtain the high-strength and wear-resistant Al-Si-Cu aluminum alloy.

2. The high-strength, wear-resistant Al-Si-Cu aluminum alloy according to claim 1, characterized in that, The hexagonal boron nitride has an average particle size of 300-900 nm and a specific surface area of ​​7-11 m². 2 / g, bulk density is 1~3g / cm³ 3 .

3. The high-strength, wear-resistant Al-Si-Cu aluminum alloy according to claim 1, characterized in that, The density of the polyethyl acrylate is 0.8~1.1 g / cm³. 3 The boiling point of the polyethyl acrylate is 90~100℃.

4. A method for preparing a high-strength, wear-resistant Al-Si-Cu aluminum alloy, characterized in that, The preparation method described above is used to prepare the high-strength, wear-resistant Al-Si-Cu aluminum alloy as described in any one of claims 1 to 3. Includes the following steps: Si, Cu, Mn, Ti, Cr, Zr, Nb, Al and hexagonal boron nitride are added to a ball mill and ball milled to obtain ball milled material; Ethyl polyacrylate was added to acetone and stirred at 800-1000 r / min for 2.5-3.5 h. Then the ball milling material was added and stirred at 1100-1200 r / min for 5.1-5.5 h. The mixture was then sonicated at 60-120 kHz for 2.3-2.7 h. The mixture was then transferred to a polytetrafluoroethylene liner and placed in a high-pressure reactor. The temperature was raised to 90-100 °C and the mixture was subjected to a high-pressure reaction for 10-12 h. After the reaction was completed, the mixture was cooled to room temperature and then centrifuged and filtered to obtain a high-pressure aluminum alloy. The high-pressure aluminum alloy is subjected to a reduction treatment, which is as follows: the high-pressure aluminum alloy is placed in hydrogen gas, and then the temperature is increased to 820~880℃ at a rate of 15~25℃ / min for 5.1~5.6h. After the reaction is completed, hydrogen gas is continued to be introduced, and the temperature is cooled to room temperature at a rate of 5~15℃ / min to obtain the reduced aluminum alloy. The reduced aluminum alloy is then smelted to obtain a smelted aluminum alloy; The smelted aluminum alloy is subjected to melt treatment to obtain a molten aluminum alloy; The molten aluminum alloy is extruded to obtain an extruded aluminum alloy. The extruded aluminum alloy is quenched to obtain the high-strength and wear-resistant Al-Si-Cu aluminum alloy.

5. The preparation method according to claim 4, characterized in that, The ball milling conditions are: rotation speed 90~105 r / min, motor power 2.1~2.5 kW, ball mill jar made of stainless steel, grinding balls made of stainless steel, and under nitrogen atmosphere.

6. The preparation method according to claim 4, characterized in that, The smelting process includes the following steps: The reduced aluminum alloy is added to a smelting furnace, then heated to 710~760℃, and held for 6~12 hours to obtain the smelted aluminum alloy.

7. The preparation method according to claim 4, characterized in that, The melt treatment includes the following steps: The molten aluminum alloy is simultaneously heated by ultrasonic and electromagnetic methods to obtain the molten aluminum alloy. The frequency of the ultrasound is 60~120kHz, and the frequency of the electromagnetic heating is 6~10kHz.

8. The preparation method according to claim 4, characterized in that, The extrusion process includes the following steps: The molten aluminum alloy is added into a preheated mold, then heated to 550~580℃, pressure is 420~480MPa, and pressure is held for 20~40s to obtain the extruded aluminum alloy.

9. The preparation method according to claim 4, characterized in that, The quenching process includes the following steps: The extruded aluminum alloy was quenched in a 7-9 wt% sodium chloride solution at 16-18°C for 36-38 seconds and then dried to obtain the high-strength and wear-resistant Al-Si-Cu aluminum alloy.

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