CN108823518B - Preparation method of high-thermal-conductivity aluminum-silicon alloy bar - Google Patents

Preparation method of high-thermal-conductivity aluminum-silicon alloy bar Download PDF

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CN108823518B
CN108823518B CN201810731191.7A CN201810731191A CN108823518B CN 108823518 B CN108823518 B CN 108823518B CN 201810731191 A CN201810731191 A CN 201810731191A CN 108823518 B CN108823518 B CN 108823518B
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alloy
cast ingot
treatment
ingot
aluminum
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CN108823518A (en
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王晔
郭宇
许红雨
胡茂良
吉泽升
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Harbin University of Science and Technology
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Harbin University of Science and Technology
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    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22FCHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
    • C22F1/00Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
    • C22F1/002Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working by rapid cooling or quenching; cooling agents used therefor
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22FCHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
    • C22F1/00Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
    • C22F1/04Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon
    • C22F1/043Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon of alloys with silicon as the next major constituent

Abstract

A preparation method of a high-thermal-conductivity aluminum-silicon alloy bar comprises the following steps: (1) taking an Al-Si alloy ingot, milling the upper surface and the lower surface of the Al-Si alloy ingot to be flat, processing the flat surface into a cylindrical shape, and cleaning/washing the surface of an aluminum ingot sample; (2) placing the Al-Si alloy ingot treated in the step (1) into a heat treatment furnace for homogenization treatment; (3) pre-heating the cooled cast ingot in a heat treatment furnace before hot extrusion; (4) carrying out hot extrusion on the cast ingot uniformly heated in the step (3) at an extrusion ratio of 25: 1; (5) after the hot extrusion is finished, the Al-Si alloy bar obtained by the hot extrusion is placed in a heat treatment furnace again for T6 heat treatment. The high-thermal-conductivity alloy has the advantages of high thermal conductivity coefficient, good mechanical property, excellent machining performance, reliable principle of the preparation method, simple and convenient operation, low production cost and the like, is very suitable for radiator components in various fields, and has wide market application prospect.

Description

Preparation method of high-thermal-conductivity aluminum-silicon alloy bar
Technical Field
The invention relates to a preparation method of a high-thermal-conductivity aluminum-silicon alloy bar, in particular to a preparation method for thermally extruding a traditional cast aluminum-silicon alloy into a bar and improving the thermal conductivity of the bar, and belongs to the field of preparation methods of materials.
Background
The aluminum alloy bar has wide application range, can be used as a structural bearing part in the aerospace and automobile industries, and can also be used for forming devices such as various wires, electrical elements, conductors and the like in industrial electrical and household electrical appliances. Obviously, aluminum alloy rods required in the electrical field should have good thermal conductivity. At present, aluminum alloys with specifications such as round bars, square bars and the like mainly adopt series of wrought aluminum alloy materials such as 1XXX-7XXX and the like, and in the wrought aluminum alloys, although the 1 series and 3 series of wrought aluminum alloys have good heat dissipation effects, the materials are usually deformed or corroded to form through holes in the using process due to general mechanical properties of the materials, so that the electric elements are failed; the thermal conductivity coefficient of 5 series and 7 series aluminum alloys with better mechanical properties is not ideal, the heat dissipation effect is not ideal, and components needing heat dissipation are affected to work normally or even are scrapped due to overheating. The invention utilizes the excellent mechanics of the cast Al-Si aluminum alloy, and leads the material to generate plastic deformation by a hot extrusion method on the premise of simultaneously improving the mechanical property of the material so as to greatly improve the thermal conductivity of the Al-Si alloy, thereby providing a preparation method of the high-thermal-conductivity aluminum-silicon alloy bar.
Disclosure of Invention
In view of the above problems, an object of the present invention is to provide a method for preparing a high thermal conductivity aluminum-silicon alloy bar, wherein the obtained aluminum-silicon alloy bar has good mechanical properties, a high thermal conductivity coefficient and a high productivity.
The invention adopts the following specific technical scheme for realizing the purpose:
a preparation method of a high-thermal-conductivity aluminum-silicon alloy bar comprises the following steps:
the preparation method of the high-thermal-conductivity aluminum-silicon alloy bar comprises the following steps:
(1) taking an Al-Si alloy ingot to be hot extruded, milling the upper surface and the lower surface of the Al-Si alloy ingot to be flat, processing the flat surface into a cylindrical shape, cleaning and polishing the surface of the Al-Si alloy ingot;
(2) placing the Al-Si alloy ingot treated in the step (1) into a heat treatment furnace for homogenization treatment;
(3) putting the Al-Si alloy ingot treated in the step (2) into a heat treatment furnace for pre-heating treatment before hot extrusion;
(4) carrying out hot extrusion on the alloy ingot uniformly heated in the step (3) by adopting a double-rolling mill;
(5) after the hot extrusion is finished, the Al-Si alloy bar obtained by the hot extrusion is placed in a heat treatment furnace again for T6 treatment.
Preferably, the Al — Si alloy in the step (1) is an Al — Si alloy for casting, and the alloy state is a cast state.
Preferably, the Al-Si alloy in the step (1) is polished by 180-mesh carborundum paper.
Preferably, the upper and lower surfaces of Al — Si in step (1) are formed by milling, and the cylindrical shape is formed by turning or wire electrical discharge machining.
Preferably, the soaking temperature of the homogenization treatment in the step (2) is 500-520 ℃, the soaking time is 12-18h, and the cooling mode is air cooling.
Preferably, the heating temperature of the preheating treatment in the step (3) is 400-.
Preferably, the extrusion ratio during the hot extrusion in step (4) is from 16:1 to 50: 1.
Preferably, in the T6 treatment in the step (5), the solid solution temperature is 510-530 ℃, the solid solution time is 6-8h, the aging temperature is 160-180 ℃, and the aging time is 6-8 h.
Preferably, in the T6 treatment of the step (5), quenching is performed by water quenching after completion of solid solution, and the water temperature for quenching is 60-80 ℃.
Another object of the present invention is to provide an aluminum-silicon alloy bar with high thermal conductivity prepared by the method according to any of the above aspects.
Compared with the prior art, the invention has the advantages that: the high-thermal-conductivity aluminum-silicon alloy bar prepared by the method has high thermal conductivity coefficient and good mechanical property, the comprehensive performance of the material after hot extrusion exceeds that of the parent metal, and the preparation method has reliable principle and simple and convenient operation, is very suitable for mass production and has wide market application prospect.
Detailed Description
The invention is further illustrated below with reference to examples and comparative examples.
Example 1
In this embodiment, the preparation method of the high thermal conductivity aluminum alloy is as follows: the method comprises the steps of adopting a turned ADC12 alloy cast ingot with the size of phi 40mm multiplied by 120mm, obtaining the alloy cast ingot through a casting mode, milling and flattening the upper surface and the lower surface of the alloy cast ingot, cleaning and washing the surface of the alloy cast ingot, and then grinding the surface of the cast ingot by 180-mesh carborundum paper. Placing the ADC12 alloy ingot into a box-type heat treatment furnace for homogenization treatment, wherein the homogenization treatment temperature is 500 ℃, the homogenization treatment time is 18h, and then taking out the ingot from the heat treatment furnace and placing the ingot in air for cooling. And (3) putting the cooled ADC12 alloy cast ingot into a box-type heat treatment furnace again for preheating treatment, wherein the heating temperature of the preheating treatment is 400 ℃, and the heat preservation time is 1 h. And after the preheating treatment is finished, taking the ADC12 alloy cast ingot out of the box type heat treatment furnace, and putting the cast ingot into a die for direct hot extrusion. The hot extrusion is carried out by adopting a vertical extruder, the extrusion ratio is 25:1, and the extrusion pressure is 700 MPa. After the hot extrusion is finished, the obtained ADC12 alloy bar is placed into a box type heat treatment furnace again for T6 treatment (solid solution and aging), the solid solution temperature is 510 ℃, the solid solution time is 7 hours, after the solid solution is finished, quenching is carried out in a water quenching mode, the water temperature for quenching is 80 ℃, after the quenching is finished, aging treatment is carried out, the aging temperature is 170 ℃, the aging time is 7 hours, and after the aging is finished, the alloy bar is placed into air for cooling. And obtaining the final high-heat-conductivity aluminum-silicon alloy bar product.
Mechanical property tests are respectively carried out on the aluminum-silicon alloy bar and the original parent metal obtained by the method, and the ultimate tensile strength is 290MPa and the elongation is 7.2 percent. The base material ADC12 alloy ingot has an ultimate tensile strength of 220MPa and an elongation of 1.0%.
Further, the aluminum-silicon alloy bar and the original base metal obtained by the method are respectively subjected to heat conductivity tests, and the heat conductivity coefficient of the ADC12 aluminum-silicon alloy bar is 153 (W/m.K), and the heat conductivity coefficient of the base metal ADC12 alloy ingot is 97 (W/m.K).
Compared with the base metal, the heat-conducting property of the aluminum-silicon alloy bar material prepared by the embodiment of the invention is improved by 57.73%, the limited tensile strength is improved by 31.82%, and the elongation is improved by 6 times.
Comparative example 1
This comparative example was hot extruded using an ADC12 alloy ingot of the same size as example 1. Compared with the example, the treatment process of the alloy ingot in the comparative example is only different in that homogenization treatment is not carried out before hot extrusion, the ADC12 alloy ingot after processing and grinding is directly subjected to preheating treatment and then is subjected to hot extrusion, and T6 treatment is carried out after the hot extrusion is finished. The process parameters of preheating treatment, hot extrusion and T6 treatment are consistent and unchanged relative to example 1. The aluminum-silicon alloy bar obtained by the method is respectively subjected to mechanical property test and heat conductivity test, and the ultimate tensile strength of the aluminum-silicon alloy bar is 272MPa, the elongation is 5.6 percent, and the heat conductivity coefficient is 130 (W/m.K).
Comparative example 2
This comparative example was hot extruded using an ADC12 alloy ingot of the same size as example 1. The treatment of the alloy ingot in this comparative example was compared to the examples except that the T6 treatment was not applied after the hot extrusion was completed. The process parameters of homogenization, preheating and hot extrusion were kept consistent with those of example 1 and were not changed. The aluminum-silicon alloy bar obtained by the method is respectively subjected to mechanical property test and heat conductivity test, and the ultimate tensile strength of the aluminum-silicon alloy bar is 233MPa, the elongation is 6.8 percent, and the heat conductivity coefficient is 126 (W/m.K).
Comparative example 3
This comparative example was hot extruded using an ADC12 alloy ingot of the same size as example 1. Compared with the example, the treatment process of the alloy ingot in the comparative example only differs from the example in that homogenization treatment is not carried out before hot extrusion, the ADC12 alloy ingot after processing and grinding is directly subjected to hot extrusion after preheating treatment, and T6 treatment is not carried out after the hot extrusion is finished. The process parameters of the preheating treatment and the hot extrusion are consistent with those of the example 1 and are not changed. The aluminum-silicon alloy bar obtained by the method is respectively subjected to mechanical property test and heat conductivity test, and the ultimate tensile strength of the aluminum-silicon alloy bar is 219MPa, the elongation is 6.6 percent, and the heat conductivity coefficient is 138 (W/m.K).
Comparative example 4
In the comparative example, the ADC12 alloy ingot which is completely the same as the ADC12 alloy ingot in the example 1 is directly used for the T6 treatment, an intermediate treatment procedure is not carried out, and the process parameters of the T6 treatment are consistent relative to the process parameters in the example 1 and are not changed. The aluminum-silicon alloy obtained by the method is respectively subjected to mechanical property test and heat conductivity test, and the ultimate tensile strength of the aluminum-silicon alloy bar is 267MPa, the elongation is 1.5 percent, and the heat conductivity coefficient is 108 (W/m.K).
Comparative example 5
Since ADC12 is an aluminum alloy for die casting, in this comparative example, the same ADC12 alloy as that in die casting as in example 1 was directly used to perform mechanical property test and thermal conductivity test, respectively, and the ultimate tensile strength of the aluminum-silicon alloy bar was 259MPa, the elongation was 1.1%, and the thermal conductivity was 95(W/m · K).
In contrast, the product made using the examples of the present invention was compared with the product made using the comparative example: compared with the comparative example 1, the heat conductivity coefficient is improved by 17.69%, the ultimate tensile strength is improved by 6.61%, and the elongation is improved by 28.57%; compared with the comparative example 2, the heat conductivity coefficient is improved by 21.42 percent, the ultimate tensile strength is improved by 24.46 percent, and the elongation is improved by 5.88 percent; compared with the comparative example 3, the heat conductivity coefficient is improved by 8.7 percent, the ultimate tensile strength is improved by 32.42 percent, and the elongation is improved by 9.1 percent; compared with the comparative example 4, the heat conductivity coefficient is improved by 41.67%, the ultimate tensile strength is improved by 8.61%, and the elongation is improved by 4 times; compared with comparative example 5, the heat conductivity coefficient is improved by 61.05 percent, the ultimate tensile strength is improved by 11.97 percent, and the elongation is improved by 5 times
The above-described embodiments are merely preferred embodiments of the present invention, which should not be construed as limiting the invention. Various changes and modifications may be made by one of ordinary skill in the pertinent art without departing from the spirit and scope of the present invention. Therefore, the technical scheme obtained by adopting the mode of equivalent replacement or equivalent transformation is within the protection scope of the invention.

Claims (2)

1. The preparation method of the high-thermal-conductivity aluminum-silicon alloy bar is characterized by comprising the following steps:
adopting a turned ADC12 alloy cast ingot with the size of ϕ 40mm multiplied by 120mm, wherein the alloy cast ingot is obtained by a casting mode, milling and flattening the upper surface and the lower surface of the alloy cast ingot, cleaning and washing the surface of the alloy cast ingot, and then grinding the surface of the cast ingot by 180-mesh carborundum paper; placing the ADC12 alloy cast ingot into a box-type heat treatment furnace for homogenization treatment, wherein the homogenization treatment temperature is 500 ℃, the homogenization treatment time is 18h, and then taking out the cast ingot from the heat treatment furnace and placing the cast ingot into air for cooling; the cooled ADC12 alloy cast ingot is placed into a box type heat treatment furnace again for preheating treatment, the heating temperature of the preheating treatment is 400 ℃, and the heat preservation time is 1 h; taking the ADC12 alloy cast ingot out of the box-type heat treatment furnace after the preheating treatment is finished, and putting the cast ingot into a die to directly carry out hot extrusion; carrying out hot extrusion by adopting a vertical extruder, wherein the extrusion ratio is 25:1, and the extrusion pressure is 700 MPa; after the hot extrusion is finished, the obtained ADC12 alloy bar is placed into a box type heat treatment furnace again for T6 treatment, the solid solution temperature is 510 ℃, the solid solution time is 7 hours, quenching is carried out in a water quenching mode after the solid solution is finished, the water temperature for quenching is 80 ℃, aging treatment is carried out after the quenching is finished, the aging temperature is 170 ℃, the aging time is 7 hours, and after the aging is finished, the aluminum-silicon alloy bar is placed into the air for cooling to obtain the high-heat-conductivity aluminum-silicon alloy bar.
2. A high thermal conductivity Al-Si alloy bar prepared by the method of claim 1.
CN201810731191.7A 2018-07-05 2018-07-05 Preparation method of high-thermal-conductivity aluminum-silicon alloy bar Active CN108823518B (en)

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103725933A (en) * 2013-12-17 2014-04-16 芜湖万润机械有限责任公司 Preparation method of aluminium alloy section for diesel engine piston
CN107492794A (en) * 2017-08-31 2017-12-19 国网河南省电力公司西峡县供电公司 One kind sealing heat-conducting type outdoor power cabinet

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5925667B2 (en) * 2012-11-19 2016-05-25 株式会社神戸製鋼所 Aluminum alloy material for high-pressure hydrogen gas container and manufacturing method thereof

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103725933A (en) * 2013-12-17 2014-04-16 芜湖万润机械有限责任公司 Preparation method of aluminium alloy section for diesel engine piston
CN107492794A (en) * 2017-08-31 2017-12-19 国网河南省电力公司西峡县供电公司 One kind sealing heat-conducting type outdoor power cabinet

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