CN104046866B - A kind of preparation method of high connductivity high strength rare earth aluminium alloy transport material - Google Patents

Abstract

The invention discloses a kind of preparation method of high connductivity high strength rare earth aluminium alloy transport material, is this aluminum alloy materials elementary composition by following weight percent: Cu 4.2-5.5, Zn 2.4-3.6, Be 0.5-0.8, Ta 0.15-0.25, Cr 0.2-0.4, Nb 0.4-0.6, Mn 0.7-1.4, Mg 1.8-2.6, Zr 0.1-0.2, Sc 0.08-0.12, Nd 0.05-0.1, Er 0.04-0.06, surplus is Al.The aluminum alloy materials that the present invention obtains has excellent conductivity and higher tensile strength, tensile strength >=620MPa, electric conductivity >=95%IACS, has the advantages such as high-fidelity performance, corrosion-resistant, processing characteristics is excellent, the life-span is long simultaneously, can be widely used in making electronic industry transport material.

Description

A preparation method of a high-conductivity high-strength rare earth aluminum alloy transmission material

technical field

The invention relates to a preparation method of a high-conductivity and high-strength rare-earth aluminum alloy transmission material, and belongs to the technical field of aluminum alloy material processing.

Background technique

Aluminum and aluminum alloys have the advantages of excellent electrical conductivity, high strength, and light weight, and are widely used as transmission materials in the electronics industry. With the development of the electronics industry and the development of high-frequency and high-speed digital transmission of electronic signals, aluminum alloys The electrical conductivity of the transmission material can no longer meet the requirements, causing signal loss, or even severe or complete distortion. At the same time, the requirements for the mechanical strength of the rare earth aluminum alloy transmission material are getting higher and higher. Therefore, it is urgent to develop a high-conductivity and high-strength rare earth aluminum alloy transmission material.

Contents of the invention

In order to solve the deficiencies of the prior art, the object of the present invention is to provide a method for preparing a high-conductivity and high-strength rare-earth aluminum alloy transmission material. The aluminum alloy material has excellent high-fidelity performance, electrical performance and mechanical performance.

To achieve the above object, the technical scheme adopted in the present invention is as follows:

A method for preparing a high-conductivity and high-strength rare earth aluminum alloy transmission material, comprising the following steps:

(1) According to Al-6.5wt%Cu-0.4wt%Cr-0.8wt%Be-0.3wt%Ta alloy ingredients, then add the weighed pure aluminum into the melting furnace, heat to 725-745°C, wait More than 80% of the pure aluminum is melted, and the temperature is adjusted to 720-740°C. The alloy components are added in sequence according to Cu, Be, Cr, and Ta, stirred, refined, slag removed, left standing, and poured out of the furnace. The pouring temperature is 700-720°C. Obtain Al-Cu-Cr-Be-Ta alloy;

(2) According to the mass ratio of 2-3:1, take pure aluminum and waste aluminum as base materials and add them to the melting furnace for heating and melting. When the temperature reaches 730-750°C, add the Al-Cu-Cr- Be-Ta alloy, after it is completely melted, adjust the temperature to 750-770°C, add Zn, Mg, Cr, Mn, Nb, Zr and other alloy components, adjust the temperature to 735-755°C after melting, add the melt weight 1.5 Refining with 2.5% refining agent for 15-20min, after removing slag, adjust the temperature to 740-760°C, add mixed rare earth metal, stir for 10-15min after melting, sample and analyze, adjust the composition so that the weight percentage of each element in the alloy liquid Meet the following requirements: Cu4.2-5.5, Zn2.4-3.6, Be0.5-0.8, Ta0.15-0.25, Cr0.2-0.4, Nb0.4-0.6, Mn0.7-1.4, Mg1.8- 2.6, Zr0.1-0.2, Sc0.08-0.12, Nd0.05-0.1, Er0.04-0.06, the balance is Al; put it out of the oven after standing for 15-20min, the pouring temperature is 715-725℃, and then pass Continuous casting and rolling process to make the required aluminum alloy material;

(3) Carry out heat treatment on the aluminum alloy material prepared above: first raise the temperature to 520-540°C at 250-300°C/h, keep it warm for 0.5-1h, then cool it with strong wind to 200-250°C, keep it warm for 2-3h, and then Raise the temperature at 100-150°C/h to 450-480°C, keep it warm for 1-2h, then cool it down at 80-120°C/h to 240-280°C, keep it warm for 2-3h, then place it in ice water at 0-5°C to cool down to Below 50°C, then take it out and heat it up to 80-90°C at 40-50°C/h, keep it warm for 15-20h, cool it to room temperature in air, then heat it up to 110-130°C at 50-60°C/h, keep it warm for 10-15h, and then Raise the temperature at 20-40°C/h to 180-200°C, keep it warm for 5-10h, then cool it down at 60-80°C/h to 65-75°C, keep it warm for 18-24h, then air cool to room temperature.

The preparation method of described refining agent is as follows: a, get the raw material of following weight portion: sodium chloride 40-50, potassium chloride 25-35, dolomite 10-15, pyrophyllite 8-12, brucite 10-15, Diatomaceous earth 5-10, Yuanming powder 4-8, soda ash 3-6, cryolite powder 7-11, carnallite powder 6-9, refractory brick chips 4-8; b, take dolomite, pyrophyllite, brucite , diatomaceous earth mixed evenly, calcined at 1180-1240°C for 2-3h, water quenched, crushed, ground, passed through a 80-100 mesh sieve, and set aside; b, mixed sodium chloride and potassium chloride evenly, heated to 805- 825°C, after it is completely melted, add the powder prepared in step a, stir for 3-5 minutes, let stand to condense and then pulverize into powder, mix with the rest of the raw materials evenly, grind, and pass through a 100-150 mesh sieve.

Beneficial effects of the present invention:

Rare earth elements such as Sc, Nd, and Er are added to the aluminum alloy of the present invention, which can not only refine the crystal structure in the aluminum alloy, reduce the surface roughness, greatly improve the electrical conductivity and data transmission fidelity performance, but also play the role of dispersion strengthening It promotes the uniform dispersion of the strengthening phase of the compound, improves and refines the as-cast structure, and improves the mechanical strength of the alloy. The aluminum alloy material prepared by the invention has excellent electrical conductivity and high tensile strength, tensile strength ≥ 620 MPa, electrical conductivity ≥ 95% IACS, high fidelity performance, corrosion resistance, excellent processing performance, long life, etc. Advantages, it can be widely used in the production of transmission materials for the electronics industry.

detailed description

A method for preparing a high-conductivity and high-strength rare earth aluminum alloy transmission material, comprising the following steps:

(1) According to Al-6.5wt%Cu-0.4wt%Cr-0.8wt%Be-0.3wt%Ta alloy ingredients, then add the weighed pure aluminum into the melting furnace, heat to 735°C, and wait for the pure aluminum Melt more than 80%, adjust the temperature to 725°C, add alloy components in sequence according to Cu, Be, Cr, and Ta, stir, refine, remove slag, stand still, and pour out of the furnace at a pouring temperature of 710°C to obtain Al-Cu-Cr -Be-Ta alloy;

(2) Take pure aluminum and waste aluminum as the base material according to the mass ratio of 2:1 and add it to the melting furnace for heating and melting. When the temperature reaches 740 ° C, add the Al-Cu-Cr-Be-Ta alloy prepared in step (1) After it is completely melted, adjust the temperature to 760°C, add alloy components such as Zn, Mg, Cr, Mn, Nb, Zr, etc., adjust the temperature to 745°C after melting, add a refining agent with a weight of 2% of the melt to refine for 20 minutes, and then remove After slag, adjust the temperature to 750°C, add mixed rare earth metals, stir for 10 minutes after melting, take samples for analysis, and adjust the composition so that the weight percentage of each element in the alloy liquid meets the following requirements: Cu4.2-5.5, Zn2.4-3.6, Be0.5-0.8, Ta0.15-0.25, Cr0.2-0.4, Nb0.4-0.6, Mn0.7-1.4, Mg1.8-2.6, Zr0.1-0.2, Sc0.08-0.12, Nd0. 05-0.1, Er0.04-0.06, the balance is Al; put it out of the furnace after standing for 20 minutes, pouring temperature is 720 ℃, and then make the required aluminum alloy material through continuous casting and rolling process;

(3) Heat treatment of the aluminum alloy material prepared above: first heat up to 530°C at 250°C/h, hold for 0.5h, then cool with strong wind to 200°C, hold for 2h, then heat up to 480°C at 150°C/h , keep it warm for 1 hour, then cool it down to 260°C at 100°C/h, keep it warm for 2 hours, put it in 2°C ice water and cool it down to below 50°C, then take it out and heat it up to 90°C at 50°C/h, keep it warm for 15 hours, and air cool to room temperature Raise the temperature at 60°C/h to 120°C, hold for 10 hours, then raise the temperature at 30°C/h to 200°C, hold for 5 hours, then cool down to 65°C at 70°C/h, hold for 22 hours, and air cool to room temperature.

The preparation method of described refining agent is as follows: a, get the raw material of following weight portion: sodium chloride 50, potassium chloride 25, dolomite 10, pyrophyllite 12, brucite 10, diatomite 10, sodium sulfate 6, Soda ash 4, cryolite powder 8, carnallite powder 7, refractory brick shavings 6; b, mix dolomite, pyrophyllite, brucite, and diatomite evenly, calcinate at 1240°C for 2 hours, water quench, crush, grind, and pass through 100 mesh Sieve, stand-by; b. Mix sodium chloride and potassium chloride evenly, heat to 815°C, after they are completely melted, add the powder obtained in step a, stir for 3min, stand to condense and then pulverize into powder, Mix evenly with the remaining raw materials, grind, and pass through a 150-mesh sieve.

The main properties of the obtained aluminum alloy material are shown in the following table:

project result 2 --> tensile strength 642MPa Elongation 12.4% Conductivity 97%IACS

Claims (2)

1. a preparation method for high connductivity high strength rare earth aluminium alloy transport material, is characterized in that comprising the following steps:

(1) by Al-6.5wt%Cu-0.4wt%Cr-0.8wt%Be-0.3wt%Ta alloying constituent batching, then load weighted fine aluminium is added in smelting furnace, be heated to 725-745 DEG C, treat fine aluminium melting down more than 80%, temperature adjustment, to 720-740 DEG C, adds alloying constituent successively by Cu, Be, Cr, Ta, stirs, refining, skim, leave standstill, cast of coming out of the stove, teeming temperature is 700-720 DEG C, obtains Al-Cu-Cr-Be-Ta alloy;

(2) 2-3:1 gets fine aluminium and aluminium scrap adds heat fused in smelting furnace as base-material in mass ratio, when temperature reaches 730-750 DEG C, add the Al-Cu-Cr-Be-Ta alloy that step (1) is obtained, after its all fusing, temperature adjustment is to 750-770 DEG C, add Zn, Mg, Cr, Mn, Nb, Zr alloying constituent, after fusing, temperature adjustment is to 735-755 DEG C, add the refining agent refining 15-20min of liquation weight 1.5-2.5%, after skimming, temperature adjustment is to 740-760 DEG C, add norium, 10-15min is stirred after fusing, sampling analysis, adjusting component, the weight percent of each elemental composition in aluminium alloy is met the following requirements: Cu4.2-5.5, Zn2.4-3.6, Be0.5-0.8, Ta0.15-0.25, Cr0.2-0.4, Nb0.4-0.6, Mn0.7-1.4, Mg1.8-2.6, Zr0.1-0.2, Sc0.08-0.12, Nd0.05-0.1, Er0.04-0.06, surplus is Al, leave standstill cast of coming out of the stove after 15-20min, teeming temperature is 715-725 DEG C, then makes required aluminum alloy materials by casting and rolling process,

(3) above-mentioned obtained aluminum alloy materials is heat-treated: be first warming up to 520-540 DEG C with 250-300 DEG C/h, insulation 0.5-1h, then high wind is air-cooled to 200-250 DEG C, insulation 2-3h, 450-480 DEG C is warming up to again with 100-150 DEG C/h, insulation 1-2h, then 240-280 DEG C is cooled to 80-120 DEG C/h, insulation 2-3h, be placed in 0-5 DEG C of frozen water again and be cooled to less than 50 DEG C, then take out and be warming up to 80-90 DEG C with 40-50 DEG C/h, insulation 15-20h, 110-130 DEG C is warming up to 50-60 DEG C/h after air cooling to room temperature, insulation 10-15h, 180-200 DEG C is warming up to again with 20-40 DEG C/h, insulation 5-10h, 65-75 DEG C is cooled to again with 60-80 DEG C/h, insulation 18-24h, air cooling is to room temperature.

2. the preparation method of a kind of high connductivity high strength rare earth aluminium alloy transport material according to claim 1, it is characterized in that, the preparation method of described refining agent is as follows: a, get the raw material of following weight part: sodium-chlor 40-50, Repone K 25-35, rhombspar 10-15, agalmatolite 8-12, brucite 10-15, diatomite 5-10, Sodium sulfate anhydrous.min(99) 4-8, soda ash 3-6, cryolite powder 7-11, carnallitite powder 6-9, refractory brick bits 4-8; B, get rhombspar, agalmatolite, brucite, diatomite mixes, 1180-1240 DEG C of calcining 2-3h, shrend, pulverizes, and 80-100 mesh sieve is crossed in grinding, stand-by; B, sodium-chlor and Repone K to be mixed, be heated to 805-825 DEG C, after its whole melting, add the powder that step a is obtained, stir 3-5min, be ground into Powdered after leaving standstill condensation again, mix with remaining raw material, grinding, cross 100-150 mesh sieve.