阅读说明：本技术 一种高导热铝合金及其制备方法 (high-thermal-conductivity aluminum alloy and preparation method thereof ) 是由 白福林 于 2019-11-21 设计创作，主要内容包括：本发明公开了一种高导热铝合金,按照质量百分比由以下原料组分构成：Si：8.0-11.0％,Mg：0.4-0.6％,Cu：0.1-0.5％,Mn：0.1-0.3％,Fe：0.5-0.8％,Ni：0.03-0.10％,Pb：0.03-0.06％,复合稀土0-0.15％,余量为Al。本发明还公开了上述铝合金的制备方法,将上述原料高温熔化后静置降温,精炼降温,最后铸造成型。通过本发明的方法制备的铝合金具有高导热以及优良的机械性能的特性,且工艺简单,成本低。(The invention discloses high-thermal-conductivity aluminum alloys, which are composed of the following raw materials, by mass, 8.0-11.0% of Si, 0.4-0.6% of Mg, 0.1-0.5% of Cu, 0.1-0.3% of Mn, 0.5-0.8% of Fe, 0.03-0.10% of Ni, 0.03-0.06% of Pb, 0-0.15% of composite rare earth and the balance Al..)

kinds of high heat conductivity aluminum alloy, which is characterized by comprising the following raw materials, by mass, 8.0-11.0% of Si, 0.4-0.6% of Mg, 0.1-0.5% of Cu, 0.1-0.3% of Mn, 0.5-0.8% of Fe, 0.03-0.10% of Ni, 0.03-0.06% of Pb, 0-0.15% of composite rare earth and the balance of Al.

2. The kinds of high thermal conductive aluminum alloy of claim 1, wherein the composite rare earth comprises Ce and La, and the mass percentage of Ce to La is 2: 1.

3. The kind of high thermal conductivity aluminum alloy according to claim 1, further comprising Sr 0.01-0.08%, Hg 0.06-0.09%, Cd 0.004-0.007%.

The preparation method of the high-thermal-conductivity aluminum alloy is characterized by comprising the following steps:

step 1, weighing the raw materials of in any claim from 1 to 3;

step 2, feeding the raw materials weighed in the step 1 into a smelting furnace for high-temperature melting, stirring in the melting process to make the components uniform, standing and cooling to obtain an alloy melt;

3, placing the alloy melt obtained in the step 2 in a refiner, adding a refining agent for refining, introducing nitrogen in the refining process, and then standing for cooling;

and 4, casting and molding the alloy melt refined in the step 3 to obtain the high-thermal-conductivity aluminum alloy.

5. The method for preparing kinds of high thermal conductive aluminum alloys according to claim 4, wherein the refining agent in step 3 is composed of, by mass, 40-55% NaCl, 12-17% CaS, and A1F₃8-15％、MgF₂4-9％、Na₂SiF₆4-7％、C₂Cl₆0.5-1.0%, 15-20% of graphite and 10-23% of LiCl.

6. The method for preparing kinds of high thermal conductivity aluminum alloy as claimed in claim 4, wherein the refining temperature in step 3 is 750-755 ℃.

7. The method for preparing kinds of high thermal conductive aluminum alloys according to claim 4, wherein the casting method in step 4 is pressure casting, specifically, the alloy body refined in step 3 is heated to 460-500 ℃ and placed in an extruder with an extrusion ratio of 50-100 to extrude at an extrusion speed of 3.0-6.0 mm/s.

8. The method for preparing kinds of high thermal conductive aluminum alloys according to claim 7, wherein the extrusion process is simultaneously cooled by water.

9. The method for preparing kinds of high thermal conductive aluminum alloys according to claim 4, wherein annealing treatment is further performed after the casting in step 4, specifically, annealing treatment is performed at 400-450 ℃ and heat preservation is performed for 1-5 hours.

Technical Field

The invention belongs to the technical field of nonferrous metals and preparation thereof, and relates to high-thermal-conductivity aluminum alloys and a preparation method of the aluminum alloys.

Background

Aluminum alloy is a -class nonferrous metal structural material which is most widely applied in the industry of , and is widely applied in the aviation, aerospace, automobile, mechanical manufacturing, ship and chemical industries.

The aluminum alloy has low density, high strength and good plasticity, can be processed into various sections, and has excellent electrical conductivity, thermal conductivity and corrosion resistance. However, the heat conductivity of the existing aluminum alloy material cannot meet the requirement of parts which are heated to a higher degree, and meanwhile, the preparation process is complex and the production cost is high.

Disclosure of Invention

The invention aims to provide high-thermal-conductivity aluminum alloys, which solve the problems that the thermal conductivity of parts cannot meet the requirement of higher heating, the preparation process is complex and the production cost is high in the prior art.

Another objective of the present invention is to provide a method for preparing the above-mentioned aluminum alloy with high thermal conductivity.

The invention adopts the technical scheme that high-thermal-conductivity aluminum alloys comprise, by mass, 8.0-11.0% of Si, 0.4-0.6% of Mg, 0.1-0.5% of Cu, 0.1-0.3% of Mn, 0.5-0.8% of Fe, 0.03-0.10% of Ni, 0.03-0.06% of Pb, 0-0.15% of composite rare earth and the balance of Al.

The invention is also characterized in that:

the composite rare earth comprises Ce and La, and the mass percent of Ce to La is 2: 1.

Also comprises Sr: 0.01-0.08%, Hg: 0.06-0.09%, Cd: 0.004-0.007%.

The invention adopts another technical schemes that the preparation method of high-thermal-conductivity aluminum alloys is implemented according to the following steps:

the preparation method comprises the following steps of 1, preparing the following raw materials by mass percent: si: 8.0-11.0%, Mg: 0.4-0.6%, Cu: 0.1-0.5%, Mn: 0.1-0.3%, Fe: 0.5-0.8%, Ni: 0.03 to 0.10%, Pb: 0.03-0.06% of composite rare earth, 0-0.15% of composite rare earth and the balance of Al, wherein the composite rare earth comprises Ce and La, and the mass percent of Ce and La is 2: 1;

step 2, feeding the raw materials weighed in the step 1 into a smelting furnace for high-temperature melting, stirring in the melting process to make the components uniform, standing and cooling to obtain an alloy melt;

3, placing the alloy melt obtained in the step 2 in a refiner, adding a refining agent for refining, introducing nitrogen in the refining process, and then standing for cooling;

and 4, casting and molding the alloy melt refined in the step 3 to obtain the high-thermal-conductivity aluminum alloy.

The invention is also characterized in that:

the step 1 is as follows: the material consists of the following raw materials in percentage by mass: si: 8.0-11.0%, Mg: 0.4-0.6%, Cu: 0.1-0.5%, Mn: 0.1-0.3%, Fe: 0.5-0.8%, Ni: 0.03 to 0.10%, Pb: 0.03-0.06%, 0-0.15% of composite rare earth, Sr: 0.01-0.08%, Hg: 0.06-0.09%, Cd: 0.004-0.007% of Al in balance.

In the step 3, the refining agent consists of the following raw materials in percentage by mass: NaCl 40-55%, CaS 12-17%, A1F₃8-15％、MgF₂4-9％、Na₂SiF₆4-7％、C₂Cl₆0.5-1.0%, 15-20% of graphite and 10-23% of LiCl.

The refining temperature in step 3 is 750-755 ℃.

The casting molding method in the step 4 is pressure casting, and specifically, the alloy body refined in the step 3 is heated to 460-500 ℃, and is placed in an extruder with an extrusion ratio of 50-100 to be extruded at an extrusion speed of 3.0-6.0 mm/s.

And water cooling is carried out during the extrusion treatment.

And 4, annealing treatment is carried out after the casting forming, specifically, the annealing treatment is carried out at the temperature of 400-450 ℃, and the heat preservation is carried out for 1-5 hours.

The invention has the beneficial effects that: the components of the aluminum alloy material are changed, so that the aluminum alloy material has good mechanical property and high thermal conductivity, the die-casting structural part prepared by the aluminum alloy material has good thermal conductivity and mechanical property, and the requirement of parts which are heated to a high degree can be met.

Detailed Description

The present invention will be described in detail with reference to the following embodiments.

The invention relates to a preparation method of high-thermal-conductivity aluminum alloys, which is implemented by the following steps:

the preparation method comprises the following steps of 1, preparing the following raw materials by mass percent: si: 8.0-11.0%, Mg: 0.4-0.6%, Cu: 0.1-0.5%, Mn: 0.1-0.3%, Fe: 0.5-0.8%, Ni: 0.03 to 0.10%, Pb: 0.03-0.06% of composite rare earth, 0-0.15% of composite rare earth and the balance of Al, wherein the composite rare earth comprises Ce and La, and the mass percent of Ce and La is 2: 1;

step 2, feeding the raw materials weighed in the step 1 into a smelting furnace for high-temperature melting, stirring in the melting process to make the components uniform, standing and cooling to obtain an alloy melt;

and 3, placing the alloy melt obtained in the step 2 into a refiner, adding a refining agent for refining, introducing nitrogen in the refining process, standing and cooling, wherein the refining agent comprises the following raw material components in percentage by mass: NaCl 40-55%, CaS 12-17%, A1F₃8-15％、MgF₂4-9％、Na₂SiF₆4-7％、C₂Cl₆0.5-1.0 percent of graphite, 15-20 percent of graphite and 10-23 percent of LiCl, and the refining temperature is 750-755 ℃;

and 4, casting and molding the alloy melt refined in the step 3, specifically, heating the alloy body refined in the step 3 to 460-500 ℃, placing the alloy body into an extruder with an extrusion ratio of 50-100 to extrude at an extrusion speed of 3.0-6.0 mm/s, simultaneously cooling the alloy body by water in the extrusion process, annealing after casting and molding, specifically, annealing at 400-450 ℃, and preserving heat for 1-5 hours to obtain the high-heat-conductivity aluminum alloy.

Preferably, step 1 is: the material consists of the following raw materials in percentage by mass: si: 8.0-11.0%, Mg: 0.4-0.6%, Cu: 0.1-0.5%, Mn: 0.1-0.3%, Fe: 0.5-0.8%, Ni: 0.03 to 0.10%, Pb: 0.03-0.06%, 0-0.15% of composite rare earth, Sr: 0.01-0.08%, Hg: 0.06-0.09%, Cd: 0.004-0.007% of Al in balance.