CN114717456A - High-temperature soluble aluminum alloy, preparation method and application - Google Patents
High-temperature soluble aluminum alloy, preparation method and application Download PDFInfo
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- CN114717456A CN114717456A CN202210403519.9A CN202210403519A CN114717456A CN 114717456 A CN114717456 A CN 114717456A CN 202210403519 A CN202210403519 A CN 202210403519A CN 114717456 A CN114717456 A CN 114717456A
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- 229910000838 Al alloy Inorganic materials 0.000 title claims abstract description 67
- 238000002360 preparation method Methods 0.000 title claims abstract description 14
- 239000000956 alloy Substances 0.000 claims abstract description 48
- 239000012535 impurity Substances 0.000 claims abstract description 43
- 238000010438 heat treatment Methods 0.000 claims abstract description 24
- 238000005266 casting Methods 0.000 claims abstract description 20
- 238000003723 Smelting Methods 0.000 claims abstract description 7
- 230000032683 aging Effects 0.000 claims abstract description 7
- 239000003079 shale oil Substances 0.000 claims abstract description 7
- 229910052733 gallium Inorganic materials 0.000 claims abstract description 6
- 229910052738 indium Inorganic materials 0.000 claims abstract description 6
- 229910052718 tin Inorganic materials 0.000 claims abstract description 6
- 229910045601 alloy Inorganic materials 0.000 claims description 40
- 239000003795 chemical substances by application Substances 0.000 claims description 37
- 239000002893 slag Substances 0.000 claims description 25
- 229910052782 aluminium Inorganic materials 0.000 claims description 21
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 21
- 238000001816 cooling Methods 0.000 claims description 21
- WCUXLLCKKVVCTQ-UHFFFAOYSA-M Potassium chloride Chemical compound [Cl-].[K+] WCUXLLCKKVVCTQ-UHFFFAOYSA-M 0.000 claims description 20
- 239000007788 liquid Substances 0.000 claims description 15
- 238000007670 refining Methods 0.000 claims description 15
- 238000002844 melting Methods 0.000 claims description 14
- 230000008018 melting Effects 0.000 claims description 14
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 12
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims description 12
- 239000007789 gas Substances 0.000 claims description 12
- 239000000155 melt Substances 0.000 claims description 12
- PUZPDOWCWNUUKD-UHFFFAOYSA-M sodium fluoride Chemical compound [F-].[Na+] PUZPDOWCWNUUKD-UHFFFAOYSA-M 0.000 claims description 12
- 238000001125 extrusion Methods 0.000 claims description 11
- 238000001192 hot extrusion Methods 0.000 claims description 10
- 239000001103 potassium chloride Substances 0.000 claims description 10
- 235000011164 potassium chloride Nutrition 0.000 claims description 10
- 229910018117 Al-In Inorganic materials 0.000 claims description 9
- 229910018134 Al-Mg Inorganic materials 0.000 claims description 9
- 229910018140 Al-Sn Inorganic materials 0.000 claims description 9
- 229910018229 Al—Ga Inorganic materials 0.000 claims description 9
- 229910018456 Al—In Inorganic materials 0.000 claims description 9
- 229910018467 Al—Mg Inorganic materials 0.000 claims description 9
- 229910018564 Al—Sn Inorganic materials 0.000 claims description 9
- -1 aluminum-titanium-boron Chemical group 0.000 claims description 9
- 238000005303 weighing Methods 0.000 claims description 9
- 229910052786 argon Inorganic materials 0.000 claims description 6
- 229910052742 iron Inorganic materials 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 6
- 239000011780 sodium chloride Substances 0.000 claims description 6
- 235000002639 sodium chloride Nutrition 0.000 claims description 6
- 239000011775 sodium fluoride Substances 0.000 claims description 6
- 235000013024 sodium fluoride Nutrition 0.000 claims description 6
- 229910052720 vanadium Inorganic materials 0.000 claims description 6
- 238000004519 manufacturing process Methods 0.000 claims description 2
- 238000004090 dissolution Methods 0.000 abstract description 10
- 239000000463 material Substances 0.000 abstract description 6
- 239000002994 raw material Substances 0.000 description 9
- 229910052751 metal Inorganic materials 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 229910002804 graphite Inorganic materials 0.000 description 3
- 239000010439 graphite Substances 0.000 description 3
- 238000010309 melting process Methods 0.000 description 3
- 239000004576 sand Substances 0.000 description 3
- 239000003153 chemical reaction reagent Substances 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000018109 developmental process Effects 0.000 description 2
- 239000007858 starting material Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 230000033001 locomotion Effects 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000004663 powder metallurgy Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 238000005204 segregation Methods 0.000 description 1
- 239000002195 soluble material Substances 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C21/00—Alloys based on aluminium
- C22C21/06—Alloys based on aluminium with magnesium as the next major constituent
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D7/00—Casting ingots, e.g. from ferrous metals
- B22D7/005—Casting ingots, e.g. from ferrous metals from non-ferrous metals
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/06—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/02—Making non-ferrous alloys by melting
- C22C1/026—Alloys based on aluminium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/02—Making non-ferrous alloys by melting
- C22C1/03—Making non-ferrous alloys by melting using master alloys
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/06—Making non-ferrous alloys with the use of special agents for refining or deoxidising
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/04—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon
- C22F1/047—Changing 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 magnesium as the next major constituent
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices or the like
- E21B33/134—Bridging plugs
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B2200/00—Special features related to earth drilling for obtaining oil, gas or water
- E21B2200/08—Down-hole devices using materials which decompose under well-bore conditions
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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
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Abstract
The invention discloses a high-temperature soluble aluminum alloy, a preparation method and application thereof, wherein the aluminum alloy comprises the following elements in percentage by weight: mg 1.5 wt%, Ga 0.1 wt%, In 0.7 wt%, Sn 0.6 wt%, and the balance Al and inevitable impurity elements. The soluble aluminum alloy is obtained by smelting and ingot casting of each component, and then carrying out heat treatment and aging treatment. The soluble aluminum alloy material can be used as a material of a fracturing tool for shale oil and gas exploitation. The soluble aluminum alloy prepared by the invention can be dissolved controllably in a high-temperature environment and has good mechanical property and dissolution rate.
Description
Technical Field
The invention belongs to the technical field of alloy preparation, and particularly relates to a high-temperature soluble aluminum alloy, a preparation method and application thereof.
Background
In recent oil and gas exploration, unconventional oil and gas resources in China are very rich, wherein reserves of shale gas and shale oil are in the forefront of the world, and because the shale gas and the shale oil are relatively difficult to exploit, the development of the unconventional oil and gas resources at present needs to depend on technologies such as hydraulic fracturing, and the research and development of a bridge plug is one of very important technologies in multilayer multistage staged fracturing technologies. The tool made of the soluble material can be automatically dissolved in the underground environment after the operation is finished, so that the manual drilling and grinding and recovery processes are omitted, the engineering risk is reduced, and the construction efficiency is improved.
The expansion ring is a part for fixing an object through expansion and contraction motions. The expander has a simple structure and is easy to disassemble and assemble, so the expander is widely used in mechanical parts in various industries.
The aluminum alloy in China has abundant yield, low density, high specific strength, excellent electrical conductivity, thermal conductivity and corrosion resistance, and good plasticity, can be processed into various sections, and is widely applied to the fields of aviation, aerospace, automobiles, ships and the like. When the soluble aluminum alloy all-metal bridge plug expansion ring is used in a high-temperature environment, the mechanical properties such as tensile strength, hardness and the like of the material are reduced due to poor high-temperature resistance of common soluble aluminum alloy, and meanwhile, due to high temperature, the dissolution rate of the soluble aluminum alloy is accelerated, the controllability is poor, the mechanical index requirements required during working and the effective time required for completing the operation cannot be provided, and the application range of the soluble aluminum alloy all-metal bridge plug expansion ring is limited. Therefore, the reasonable design of the element proportion and the process parameters of the high-temperature soluble aluminum alloy material is an important technical problem, the development of the high-temperature high-performance soluble aluminum alloy material is expected to be promoted by solving the problem, and the technical level of unconventional energy exploitation such as shale oil gas and the like in China is improved.
Disclosure of Invention
The invention aims to provide a high-temperature soluble aluminum alloy, a preparation method and application thereof. The high-temperature soluble aluminum alloy material can be prepared by casting, hot extrusion, heat treatment and other modes, realizes the controlled degradation of the soluble aluminum alloy material in a high-temperature environment, and has good mechanical property and stable dissolution rate in the high-temperature environment.
In order to achieve the purpose, the invention adopts the technical scheme that the high-temperature soluble aluminum alloy material comprises the following elements in percentage by weight: mg 1.5 wt%, Ga 0.1 wt%, In 0.7 wt%, Sn 0.6 wt%, and the balance Al and inevitable impurity elements.
Preferably, the tensile strength of the high-temperature soluble aluminum alloy is 120-140 MPa, and the elongation is 25-30%.
The invention also provides a preparation method of the high-temperature soluble aluminum alloy, which comprises the following steps:
step 1), weighing all elements according to the weight percentage ratio, introducing Mg by using Al-Mg intermediate alloy, introducing Ga by using Al-Ga intermediate alloy, introducing In by using Al-In intermediate alloy, introducing Sn by using Al-Sn intermediate alloy, and introducing insufficient Al by using pure aluminum ingots;
step 2), smelting and casting: under the protection of argon, firstly melting pure aluminum, and when the melting temperature reaches 715-minus 735 ℃, sequentially adding Al-Mg intermediate alloy, Al-Ga intermediate alloy, Al-In intermediate alloy and Al-Sn intermediate alloy into the aluminum liquid for melting; heating to 850-870 ℃ and preserving heat for 1-2 hours, refining after all melting, rapidly cooling the obtained aluminum alloy liquid to 50-80 ℃ at the speed of 5-8 ℃/s after preserving the heat for 5-10 minutes at 850-870 ℃, then heating to 850-870 ℃, preserving the heat for 30-40 minutes, and casting at constant temperature; casting the molten liquid in a mold, rapidly cooling to 300 ℃, and then preserving heat at the temperature of 300-400 ℃ for 7-8 hours to obtain an aluminum alloy ingot;
step 3), hot extrusion treatment: hot extruding the cast ingot to form a bar;
step 4) solution heat treatment: preserving heat for 1-2h at 440 ℃, and then preserving heat for 1-2h at 500 ℃;
step 5), aging treatment is carried out: keeping the temperature at 80 ℃ for 8-12h, and cooling to room temperature in air.
Preferably, in the step 2), an impurity removing agent is added for impurity removal and refining, wherein the impurity removing agent comprises sodium fluoride, sodium chloride and potassium chloride in a mass ratio of 1: 1: 1; the addition amount of the impurity removing agent is 2-3% of the total mass of the melt.
Preferably, in the step 2), a slag removing agent is added for removing slag, the slag removing agent is an aluminum-titanium-boron wire, and the aluminum-titanium-boron wire comprises, by mass, 4.5-5.5% of Ti, 0.8-1.0% of B, and the balance of Al, wherein the contents of impurities: si is less than 0.20%, Fe is less than 0.30%, V is less than 0.25%, other elements are less than 0.03%, and the total content of impurity elements is less than 0.10%; the addition amount of the slag striking agent is 2-3% of the total mass of the melt.
Preferably, in the step 4), the extrusion temperature is 380-420 ℃, the extrusion ratio is 10-20, and the extruded aluminum alloy is kept at 150 ℃ for 7-8 h.
The invention also provides application of the high-temperature soluble aluminum alloy in preparation of a fracturing tool for shale oil and gas exploitation. Such as an all metal bridge packing expander.
Compared with the traditional soluble aluminum alloy, the soluble aluminum alloy prepared by the invention has the following beneficial effects:
(1) the high-temperature soluble aluminum alloy can refine the grain size of the cast ingot by adding the elements Ga, In and Sn, reduces the segregation of the cast ingot, and ensures the refinement of the cast ingot structure and the stability of the solubility property to a certain extent. Meanwhile, a refiner is added to further refine the grain size of the cast ingot.
(2) Compared with a powder metallurgy method, the high-temperature soluble aluminum alloy disclosed by the invention is prepared by a fusion casting method, so that the internal pores of the material are eliminated, and the mechanical property of the material is further remarkably improved.
(3) The soluble aluminum alloy material of the invention has no low-temperature phase and has better high-temperature resistance.
(4) The high-temperature soluble aluminum alloy prepared by the method has the tensile strength of 120-140 MPa, the elongation of 25-30% and good dissolution rate in a high-temperature environment of 90 ℃.
Detailed Description
The reagents or starting materials used in the present invention are commercially available, and if not otherwise specified, the reagents or starting materials used in the present invention are used in a manner conventional in the art or in accordance with the product specifications.
The high-temperature soluble aluminum alloy adopted by the invention comprises the following elements in percentage by weight: mg 1.5 wt%, Ga 0.1 wt%, In 0.7 wt%, Sn 0.6 wt%, and the balance Al and inevitable impurity elements.
The preparation method of the high-temperature soluble aluminum alloy comprises the following steps:
step 1), weighing all elements according to the weight percentage of all components of the soluble aluminum alloy, introducing Mg by using Al-Mg intermediate alloy, introducing Ga by using Al-Ga intermediate alloy, introducing In by using Al-In intermediate alloy, introducing Sn by using Al-Sn intermediate alloy, and introducing pure aluminum ingots when the Al is insufficient;
step 2), under the protection of argon, firstly melting pure aluminum, and when the melting temperature reaches 715-plus 735 ℃, sequentially adding Al-Mg intermediate alloy, Al-Ga intermediate alloy, Al-In intermediate alloy and Al-Sn intermediate alloy into the aluminum liquid for smelting; heating to 850-870 ℃ and preserving heat for 1-2 hours, refining after all melting, rapidly cooling the obtained aluminum alloy liquid to 50-80 ℃ at the speed of 5-8 ℃/s after preserving the heat for 5-10 minutes at 850-870 ℃, then heating to 850-870 ℃, preserving the heat for 30-40 minutes, and casting at constant temperature; casting the molten liquid in a mold, rapidly cooling to 300 ℃, and then preserving heat at the temperature of 300-400 ℃ for 7-8 hours to obtain an aluminum alloy ingot;
adding an impurity removing agent for impurity removal and refining, wherein the impurity removing agent comprises sodium fluoride, sodium chloride and potassium chloride in a mass ratio of 1: 1: 1; the addition amount of the impurity removing agent is 2-3% of the total mass of the melt.
Adding a slag removing agent for removing slag, wherein the slag removing agent is an aluminum-titanium-boron wire which comprises the following components in percentage by mass of 4.5-5.5% of Ti, 0.8-1.0% of B and the balance of Al, wherein the impurities are as follows: si is less than 0.20%, Fe is less than 0.30%, V is less than 0.25%, other elements are less than 0.03%, and the total content of impurity elements is less than 0.10%; the addition amount of the slag striking agent is 2-3% of the total mass of the melt.
Step 3), hot extrusion treatment: the extrusion temperature is 380-;
step 4) solution heat treatment: preserving heat for 1-2h at 440 ℃, and then preserving heat for 1-2h at 500 ℃;
step 5), aging treatment is carried out: keeping the temperature at 80 ℃ for 8-12h, and cooling to room temperature in air.
Hereinafter, some preferred embodiments will be described in detail.
Example 1
The high-temperature soluble aluminum alloy comprises the following elements in percentage by weight: 1.5 wt% of Mg, 0.1 wt% of Ga, 0.7 wt% of In, 0.6 wt% of Sn, and the balance of Al and inevitable impurity elements.
The preparation method comprises the following steps:
step 1), weighing the raw materials according to the proportion: weighing a pure aluminum ingot, an Al-Mg intermediate alloy, an Al-Ga intermediate alloy, an Al-In intermediate alloy and an Al-Sn intermediate alloy.
After the raw materials are weighed, the surfaces of the raw materials are polished by sand, and surface oxide layers are removed.
Step 2), smelting and casting: heating and melting pure aluminum in a graphite crucible, using argon gas for protection in the melting process, raising the temperature of a melt to 715 ℃ after the pure aluminum is completely melted, adding each intermediate alloy, continuously raising the temperature to 850 ℃ and preserving the heat for 2 hours, and confirming that the pure aluminum is completely melted for refining treatment; keeping the temperature of the molten aluminum alloy at 850 ℃ for 10 minutes, quickly cooling to 50 ℃ at the speed of 5 ℃/s, then heating to 850 ℃, keeping the temperature for 40 minutes, and casting at constant temperature; casting the molten liquid in a mold, rapidly cooling to 300 ℃, and preserving heat at 300 ℃ for 8 hours after cooling to obtain an aluminum alloy cast ingot;
refining treatment: adding an impurity removing agent for impurity removal and refining, wherein the impurity removing agent comprises sodium fluoride, sodium chloride and potassium chloride in a mass ratio of 1: 1: 1; the addition of the impurity removing agent is 2 percent of the total mass of the melt.
Adding a slag removing agent for removing slag, wherein the slag removing agent is an aluminum-titanium-boron wire which comprises the following components in percentage by mass of 4.5% of Ti, 1.0% of B and the balance of Al, and the impurities are as follows: si is less than 0.20%, Fe is less than 0.30%, V is less than 0.25%, other elements are less than 0.03%, and the total content of impurity elements is less than 0.10%; the addition amount of the slag striking agent is 3 percent of the total mass of the molten liquid.
Step 3), hot extrusion treatment: the extrusion temperature is 420 ℃, the extrusion ratio is 20, the extruded aluminum alloy is kept at 150 ℃ for 7h, and the cast ingot is made into a bar through hot extrusion;
step 4) solution heat treatment: keeping the temperature at 440 ℃ for 1h, and keeping the temperature at 500 ℃ for 1 h;
step 5), aging treatment is carried out: keeping the temperature at 80 ℃ for 8h, and cooling to room temperature in air.
The high-temperature soluble aluminum alloy obtained by the steps is tested, the tensile strength at room temperature is 130MPa, the elongation is 27.5%, and the high-temperature soluble aluminum alloy has a good dissolution rate in a 3% KCl solution in a high-temperature environment of 90 ℃.
Example 2
The high-temperature soluble aluminum alloy comprises the following elements in percentage by weight: mg 1.5 wt%, Ga 0.1 wt%, In 0.7 wt%, Sn 0.6 wt%, and the balance Al and inevitable impurity elements.
The preparation method comprises the following steps:
step 1), weighing the raw materials according to the proportion: weighing pure aluminum ingot, Al-Mg intermediate alloy, Al-Ga intermediate alloy, Al-In intermediate alloy and Al-Sn intermediate alloy.
After the raw materials are weighed, the surfaces of the raw materials are polished by sand, and surface oxide layers are removed.
Step 2), smelting and casting: heating and melting pure aluminum in a graphite crucible, using argon gas for protection in the melting process, heating the melt to 735 ℃ after the pure aluminum is completely melted, adding each intermediate alloy, continuously heating to 900 ℃ and preserving heat for 1h, and confirming that the pure aluminum is completely melted for refining treatment; keeping the temperature of the molten aluminum alloy at 870 ℃ for 5 minutes, quickly cooling to 80 ℃ at 8 ℃/s, then heating to 870 ℃, keeping the temperature for 30 minutes, and casting at constant temperature; casting the molten liquid in a mold, rapidly cooling to 300 ℃, and preserving heat for 7.5 hours at 350 ℃ after cooling to obtain an aluminum alloy cast ingot;
refining treatment: adding an impurity removing agent for impurity removal and refining, wherein the impurity removing agent comprises sodium fluoride, sodium chloride and potassium chloride in a mass ratio of 1: 1: 1; the addition of the impurity removing agent is 3 percent of the total mass of the melt.
Adding a slag removing agent for removing slag, wherein the slag removing agent is an aluminum-titanium-boron wire which comprises the following components in percentage by mass of 5.5% of Ti, 0.8% of B and the balance of Al, and the impurities are as follows: si is less than 0.20%, Fe is less than 0.30%, V is less than 0.25%, other elements are less than 0.03%, and the total content of impurity elements is less than 0.10%; the addition amount of the slag striking agent is 2 percent of the total mass of the molten liquid.
Step 3), hot extrusion treatment: the extrusion temperature is 400 ℃, the extrusion ratio is 15, the extruded aluminum alloy is kept at 150 ℃ for 7 hours, and the cast ingot is made into a bar through hot extrusion;
step 4), solution heat treatment: preserving heat for 1.5h at 440 ℃, and then preserving heat for 1.5h at 500 ℃;
step 5) carrying out aging treatment: keeping the temperature at 80 ℃ for 10h, and cooling to room temperature in air.
The high-temperature soluble aluminum alloy obtained by the steps is tested, the room-temperature tensile strength is 140MPa, the elongation is 30%, and the high-temperature soluble aluminum alloy has a good dissolution rate in a 3% KCl solution in a high-temperature environment of 90 ℃.
Example 3
The high-temperature soluble aluminum alloy comprises the following elements in percentage by weight: 1.5 wt% of Mg, 0.1 wt% of Ga, 0.7 wt% of In, 0.6 wt% of Sn, and the balance of Al and inevitable impurity elements.
The preparation method comprises the following steps:
step 1), weighing the raw materials according to the proportion: weighing pure aluminum ingot, Al-Mg intermediate alloy, Al-Ga intermediate alloy, Al-In intermediate alloy and Al-Sn intermediate alloy.
After the raw materials are weighed, the surfaces of the raw materials are polished by sand, and surface oxide layers are removed.
Step 2), smelting and casting: heating and melting pure aluminum in a graphite crucible, using argon gas for protection in the melting process, heating the melt to 725 ℃ after the pure aluminum is completely melted, adding each intermediate alloy, continuously heating to 880 ℃ and preserving heat for 2 hours, and confirming that the pure aluminum is completely melted for refining treatment; keeping the temperature of the molten aluminum alloy at 860 ℃ for 10 minutes, quickly cooling to 70 ℃ at 7 ℃/s, then heating to 865 ℃, keeping the temperature for 40 minutes, and carrying out constant-temperature casting; casting the molten liquid in a mold, rapidly cooling to 300 ℃, and preserving heat at 400 ℃ for 7 hours after cooling to obtain an aluminum alloy cast ingot;
refining treatment: adding an impurity removing agent for impurity removal and refining, wherein the impurity removing agent comprises sodium fluoride, sodium chloride and potassium chloride in a mass ratio of 1: 1: 1; the addition of the impurity removing agent is 2.5 percent of the total mass of the melt.
Adding a slag removing agent for removing slag, wherein the slag removing agent is an aluminum-titanium-boron wire, the aluminum-titanium-boron wire comprises the following components, by mass, 5% of Ti, 0.9% of B and the balance of Al, and the slag removing agent comprises the following impurities: si is less than 0.20%, Fe is less than 0.30%, V is less than 0.25%, other elements are less than 0.03%, and the total content of impurity elements is less than 0.10%; the addition amount of the slag striking agent is 2.5 percent of the total mass of the molten liquid.
Step 3), hot extrusion treatment: the extrusion temperature is 380 ℃, the extrusion ratio is 10, the extruded aluminum alloy is kept at 150 ℃ for 8 hours, and the cast ingot is made into a bar through hot extrusion;
step 4) solution heat treatment: keeping the temperature at 440 ℃ for 2h, and keeping the temperature at 500 ℃ for 2 h;
step 5), aging treatment is carried out: keeping the temperature at 80 ℃ for 12h, and cooling to room temperature in air.
The high-temperature soluble aluminum alloy obtained by the steps is tested, the room-temperature tensile strength is 120MPa, the elongation is 25%, and the high-temperature soluble aluminum alloy has a good dissolution rate in a 3% KCl solution in a high-temperature environment of 90 ℃.
From the above, the high-temperature soluble aluminum alloy prepared by the invention has the tensile strength of 120-140 MPa and the elongation of 25-30%, and has a good dissolution rate in a 3% KCl solution in a high-temperature environment of 90 ℃. The controlled dissolution of the material in the high-temperature environment is realized, and the material also has good mechanical properties and stable dissolution rate in the high-temperature environment.
The high-temperature soluble aluminum alloy prepared by the invention can be used for manufacturing fracturing tools for shale oil and gas exploitation, such as all-metal bridge plug expansion rings.
Claims (7)
1. The high-temperature soluble aluminum alloy material comprises the following elements in percentage by weight: mg 1.5 wt%, Ga 0.1 wt%, In 0.7 wt%, Sn 0.6 wt%, and the balance Al and inevitable impurity elements.
2. A high temperature soluble aluminum alloy according to claim 1, wherein said high temperature soluble aluminum alloy has a tensile strength of 120 to 140MPa and an elongation of 25 to 30%.
3. A method of producing a high temperature soluble aluminium alloy as claimed in any one of claims 1 or 2, including the steps of:
step 1), weighing all elements according to the weight percentage ratio, introducing Mg by using Al-Mg intermediate alloy, introducing Ga by using Al-Ga intermediate alloy, introducing In by using Al-In intermediate alloy, introducing Sn by using Al-Sn intermediate alloy, and introducing insufficient Al by using pure aluminum ingots;
step 2), smelting and casting: under the protection of argon, firstly melting pure aluminum, and when the melting temperature reaches 715-minus 735 ℃, sequentially adding Al-Mg intermediate alloy, Al-Ga intermediate alloy, Al-In intermediate alloy and Al-Sn intermediate alloy into the aluminum liquid for melting; heating to 850-870 ℃ and preserving heat for 1-2 hours, refining after all melting, rapidly cooling the obtained aluminum alloy liquid to 50-80 ℃ at the speed of 5-8 ℃/s after preserving the heat for 5-10 minutes at 850-870 ℃, then heating to 850-870 ℃, preserving the heat for 30-40 minutes, and casting at constant temperature; casting the molten liquid in a mold, rapidly cooling to 300 ℃, and then preserving heat at the temperature of 300-400 ℃ for 7-8 hours to obtain an aluminum alloy ingot;
step 3), hot extrusion treatment: hot extruding the cast ingot to form a bar;
step 4) solution heat treatment: preserving heat for 1-2h at 440 ℃, and then preserving heat for 1-2h at 500 ℃;
step 5) carrying out aging treatment: keeping the temperature at 80 ℃ for 8-12h, and cooling to room temperature in air.
4. The preparation method of the high-temperature soluble aluminum alloy as claimed in claim 3, wherein in the step 2), an impurity removing agent is added for impurity removal and refining, and the impurity removing agent comprises sodium fluoride, sodium chloride and potassium chloride in a mass ratio of 1: 1: 1; the addition amount of the impurity removing agent is 2-3% of the total mass of the melt.
5. The preparation method of the high-temperature soluble aluminum alloy according to claim 3, wherein in the step 2), a slag removing agent is added for removing slag, the slag removing agent is an aluminum-titanium-boron wire, the aluminum-titanium-boron wire comprises 4.5-5.5% of Ti, 0.8-1.0% of B and the balance of Al in percentage by mass, wherein the weight percentage of the impurities is as follows: si is less than 0.20%, Fe is less than 0.30%, V is less than 0.25%, other elements are less than 0.03%, and the total content of impurity elements is less than 0.10%; the addition amount of the slag striking agent is 2-3% of the total mass of the melt.
6. The method for preparing high temperature soluble aluminum alloy as claimed in claim 3, wherein in step 4), the extrusion temperature is 380-420 ℃, the extrusion ratio is 10-20, and the extruded aluminum alloy is kept at 150 ℃ for 7-8 h.
7. Use of a high temperature soluble aluminium alloy as claimed in any one of claims 1 or 2 in the manufacture of a fracturing tool for shale oil and gas exploration.
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