Aluminum-titanium-boron wire and method of making same

Abstract

The application provides a preparation method of aluminum-titanium-boron wire, comprising the following steps: S1, melting and heating pure aluminum ingot; then adding fluoride salt and TiB2 into the aluminum liquid, removing surface by-products after reaction; then adding fluoride salt and TiB2 again, removing surface by-products after reaction; cooling to obtain aluminum-titanium-boron alloy ingot; S2, melting and heating the aluminum-titanium-boron alloy ingot obtained in S1, then adding slagging agent and stirring uniformly, removing surface by-products after reaction; then continuously adding aluminum fluoride and stirring uniformly, introducing protective gas into the system during stirring, and fully stirring uniformly, removing surface by-products after standing for a period of time, and repeating the above steps for multiple times; S3, stirring the aluminum liquid treated in the above steps, standing for a period of time, and then casting to obtain aluminum-titanium-boron wire; the aluminum-titanium-boron wire can avoid the generation of pores or loose phenomenon in the material, improve the strength of the material, and has high tapping capacity.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of aluminum alloy smelting, in particular to an aluminum-titanium-boron wire and a preparation method thereof. BACKGROUND

[0002] Aluminum-titanium-boron is used as an additive alloy in the smelting process of aluminum and aluminum alloy, and is used for grain refinement. The aluminum-titanium-boron alloy can produce a strong refining effect on the structure of aluminum and aluminum alloy ingots. The grain refinement ability of the aluminum-titanium-boron alloy is one of the important factors determining the quality of aluminum processing materials.

[0003] In the preparation method of the aluminum-titanium-boron grain refiner, the raw materials are classified into oxide method, fluoride salt method, and pure titanium particle method. At present, the most widely used and effective method is the fluoride salt method, that is, potassium fluotitanate and potassium fluoroborate are used to produce aluminum-titanium-boron alloy through aluminothermic reaction. The aluminum-titanium-boron alloy produced by this method has good refining effect. However, the by-product potassium fluoroaluminate and the metal compound impurities brought in during the reaction and the inclusions caused by the corrosion of molten salt to refractory materials are difficult to be effectively and completely removed from the aluminum-titanium-boron alloy. As a result, these impurities are brought into the alloy to be refined along with the refiner, which reduces the refining effect of the aluminum alloy and causes the existence of low-melting-point salt impurities.

[0004] In the patent No. CN102031403A, a manufacturing method of high-purity aluminum-titanium-boron alloy refiner is disclosed, which comprises the following steps: 1) melting aluminum ingot and adding potassium fluotitanate and potassium fluoroborate for alloying; 2) pouring out the reaction by-products floating on the surface of the aluminum liquid and neutralizing with aluminum oxide powder; 3) raising the temperature of the aluminum liquid and scattering an aluminum oxide powder layer; 4) passing argon or nitrogen through a pipe to make the residual inclusions wrapped in the aluminum liquid float out and be neutralized; 5) measuring the hydrogen content after treatment by using small bubble rotating degassing refining technology; 6) scattering a special high-temperature anti-oxidation covering agent layer in a hot state above 800C; 7) raising the temperature of the aluminum liquid, and introducing the aluminum liquid into a filter box body provided with an aluminum oxide ceramic filter to perform online filtering treatment on the alloy aluminum liquid; and 8) finally lowering the temperature of the aluminum liquid, skimming off the dross, and casting into aluminum-titanium-boron wire. The method can effectively separate fluorinated salt and other inclusions in the aluminum-titanium-boron alloy liquid, so that the impurities in the aluminum-titanium-boron alloy refiner are reduced and the purity is greatly improved. However, the method has the following disadvantages: the output is low, and since the special high-temperature anti-oxidation covering agent layer is added after degassing, the liquid gold is oxidized or absorbs gas in the previous steps, which causes the material to have pores or loose phenomenon, and reduces the strength of the material. SUMMARY

[0005] In order to solve the above technical problems, the present application provides an aluminum-titanium-boron wire and a preparation method thereof, which can avoid the pores or loose phenomenon of the material, improve the strength of the material, and have a high output.

[0006] The embodiments of the present invention are achieved through the following technical solutions:

[0007] A method for preparing an aluminum-titanium-boron wire includes the following steps:

[0008] S1. Manufacturing aluminum-titanium-boron alloy ingots

[0009] Melting: Pure aluminum ingots are added to an induction furnace to melt into molten aluminum and heated to a temperature of 700-800℃;

[0010] Alloying: Pour the molten aluminum into the aluminum ladle and add a mixture of potassium fluorotitanate, potassium fluoroborate, and TiB2. Stir to carry out the first reaction. After the reaction is complete, pour off the surface brine. Then add the mixture of potassium fluorotitanate, potassium fluoroborate, and TiB2 (the mass ratio of potassium fluorotitanate and potassium fluoroborate added in the two processes is 6-8:2-4). Stir to carry out the second reaction. After the reaction is complete, pour off the surface brine.

[0011] Casting: After the alloying reaction is complete, the molten aluminum is poured into a mold and allowed to cool naturally to obtain an aluminum-titanium-boron alloy ingot;

[0012] After the aluminum ingot is melted, a mixture of potassium fluorotitanate, potassium fluoroborate, and TiB2 is added to the molten aluminum. This process, while manufacturing the aluminum-titanium-boron alloy, utilizes the fact that TiB2 is oxidized into TiO2 and B2O3 during sintering. Under the strengthening effect of these two substances, a large amount of low-viscosity liquid phase is generated. At high temperatures, this liquid phase covers the surface of the particles and fills the cracks in the material and the gaps between the internal phases of the alloy, making the material more compact and preventing porosity and looseness, thereby enhancing the strength of the material. At the same time, subsequent multiple slag removal processes effectively remove fluoride salts and other inclusions from the aluminum-titanium-boron alloy molten aluminum, improving the cleanliness of the aluminum-titanium-boron wire.

[0013] S2, molten aluminum-titanium-boron alloy ingot, continuous casting and rolling

[0014] Primary slag removal: the aluminum titanium boron alloy ingot is added into a medium frequency furnace to melt into aluminum liquid and heated to make the aluminum liquid temperature reach 700-800 DEG C, a slagging agent is added to stir, and the surface slag of the alloy aluminum liquid is scooped off to complete the primary slag removal; the slagging agent comprises the following raw materials in mass fraction: mirabilite 30-40 parts, sodium chloride 30-50 parts, potassium chloride 10-20 parts, sodium fluosilicate 10-20 parts, sodium carbonate 10-20 parts, aluminum fluoride 5-10 parts, and boron nitride 5-10 parts; the slagging agent uses sodium fluosilicate as a heating agent to improve the aluminum melt temperature, accelerate the reaction speed, and reduce the energy consumption; mirabilite and sodium fluosilicate can release part of gas at high temperature to adsorb the inclusions in the aluminum melt and float up to realize physical impurity removal; sodium chloride and sodium carbonate can improve the flowability of the inclusions in the aluminum melt to make the inclusions float up or sink quickly; sodium fluosilicate and calcium fluoride can reduce the wettability of the inclusions and the aluminum liquid to make the inclusions separate from the aluminum liquid quickly; under the cooperation of boron nitride and aluminum fluoride, boron can have sufficient reaction time with aluminum to form solid substances, which are finally removed before pouring to accelerate the effective separation of aluminum slag.

[0015] Secondary slag removal: 1KG of aluminum fluoride is continuously added to more efficiently promote the slag in the aluminum to be brought out to promote the effective separation of aluminum slag, and stirring is performed at a stirring temperature of 700-800 DEG C for a stirring time of 15-20 min; during stirring, protective gas such as argon is introduced into the system, and the gas and residual slag in the alloy aluminum liquid are uniformly stirred to float out, and the slag is removed after standing for 3 min, so that the degassing and secondary slag removal are completed, and the surface slag of the alloy aluminum liquid is scooped off;

[0016] Aluminum liquid transportation: the obtained solution is poured into an aluminum water bag to be transported to a production line, poured into a furnace, and then degassed and stirred for 30 min, and the surface slag of the alloy aluminum liquid is scooped off;

[0017] Continuous casting and rolling: the aluminum liquid after the above treatment is stirred and then stood for 10-30 min, and then belt casting is performed to finally obtain aluminum titanium boron wire.

[0018] The application further provides an aluminum titanium boron wire grain refiner prepared by the above preparation method.

[0019] The technical scheme of the application has at least the following advantages and beneficial effects:

[0020] 1. The preparation method of the aluminum titanium boron wire grain refiner adopts the mode of continuous casting and rolling after smelting, uses furnace-outside reaction to reduce the damage of the medium frequency furnace and prolong the service life; the two-time feeding can better react; the multiple slag removal can effectively remove the fluorinated salt and other inclusions in the aluminum titanium boron alloy liquid to improve the cleanliness of the aluminum titanium boron wire, and the casting composition will be very uniform after stirring and standing for 10 min.

[0021] 2、The application adds potassium fluotitanate, potassium fluoborate mixture and TiB2 into the aluminum liquid after the aluminum ingot is melted, thereby manufacturing aluminum titanium boron alloy, and TiB2 is oxidized into TiO2 and B2O3 in the sintering process, so that a large amount of low viscosity liquid phase is generated under the strengthening of the two, the liquid phase covers the surface of the particles and fills the cracks in the material and the gap between the alloy internal phases at high temperature, so that the material is more densified, the air hole and loose phenomenon are avoided, and the strength of the material is enhanced; meanwhile, the fluorinated salt and other inclusions in the aluminum titanium boron alloy liquid are effectively removed through subsequent multiple deslagging, and the cleanliness of the aluminum titanium boron wire is improved. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical scheme and advantages of the embodiments of the application more clear, the technical scheme in the embodiments of the application will be clearly and completely described below. If the specific conditions are not indicated in the embodiments, the conventional conditions or the conditions suggested by the manufacturer are adopted. If the reagents or instruments are not indicated by the manufacturer, they are all conventional products that can be purchased in the market.

[0023] Embodiment 1

[0024] A preparation method of an aluminum titanium boron wire, comprising the following steps:

[0025] S1, melt 570 kg of pure aluminum ingot and heat to 750 DEG C; then add 43.89 kg of potassium fluotitanate, 95.76 kg of potassium fluoborate and 1.91 kg of TiB2 into the aluminum liquid, stir uniformly, remove the surface by-products after the reaction is completed; then add 18.81 kg of potassium fluotitanate, 41.04 kg of potassium fluoborate and 1.91 kg of TiB2, stir uniformly, remove the surface by-products after the reaction is completed; cool the aluminum liquid after the above alloying reaction is completed to obtain an aluminum titanium boron alloy ingot;

[0026] S2, melt the aluminum titanium boron alloy ingot obtained in S1 and heat to 750 DEG C, then add 1.0wt% of deslagging agent and stir uniformly, remove the surface by-products after the reaction is completed; then continue to stir at 750 DEG C for 20 min, continue to add 1 kg of aluminum fluoride and stir uniformly, blow protective gas into the system during stirring, and fully stir uniformly, remove the surface by-products after standing for a period of time, and repeat the above process multiple times; wherein the deslagging agent comprises the following raw materials in mass fraction: mirabilite 35 parts, sodium chloride 40 parts, potassium chloride 15 parts, sodium fluosilicate 15 parts, sodium carbonate 15 parts, aluminum fluoride 8 parts and boron nitride 8 parts.

[0027] S3, stir the above treated aluminum liquid and stand for a period of time, then cast to obtain an aluminum titanium boron wire.

[0028] The aluminum-titanium-boron wire obtained in this embodiment is free of pores, has a dense microstructure, high material cleanliness, a furnace output of 650 kg, a Ti content of 5%, a B content of 1%, and a good product refinement effect.

[0029] Example 2

[0030] The difference between this embodiment and Embodiment 1 is as follows: 641 kg of pure aluminum ingot, 70.5 kg of potassium fluoroborate, and 153.8 kg of potassium fluorotitanate; the first addition of TiB2 is 2.8 kg, and the second addition is 3.2 kg; the slag remover includes the following raw materials in parts by weight: 33 parts of sodium sulfate, 43 parts of sodium chloride, 17 parts of potassium chloride, 13 parts of sodium fluorosilicate, 14 parts of sodium carbonate, 6 parts of aluminum fluoride, and 7 parts of boron nitride.

[0031] The aluminum-titanium-boron wire obtained in this embodiment is free of pores, has a dense microstructure, high material cleanliness, a furnace output of 700 kg, a Ti content of 5%, a B content of 1%, and a good product refinement effect.

[0032] Example 3

[0033] The difference between this embodiment and Embodiment 1 is as follows: 612 kg of pure aluminum ingots, 65.4 kg of potassium fluoroborate, and 142.3 kg of potassium fluorotitanate; the first addition of TiB2 is 2.4 kg, and the second addition is 2.8 kg; the slag remover includes the following raw materials in parts by weight: 46 parts of Glauber's salt, 31 parts of sodium chloride, 11 parts of potassium chloride, 18 parts of sodium fluorosilicate, 12 parts of sodium carbonate, 8 parts of aluminum fluoride, and 6 parts of boron nitride.

[0034] The aluminum-titanium-boron wire obtained in this embodiment is free of pores, has a dense microstructure, high material cleanliness, a furnace output of 670 kg, a Ti content of 5%, a B content of 1%, and good product refinement effect.

[0035] Comparative Example 1

[0036] The difference between this comparative example and Example 1 is that S1 does not contain TiB2; the aluminum-titanium-boron wire obtained in this comparative example has obvious pores, loose structure, poor material cleanliness, Ti content of 4%, B content of 0.7%, and poor product refinement effect.

[0037] Comparative Example 2

[0038] The difference between this comparative example and Example 1 is that the slag remover in S1 does not include sodium sulfate and boron nitride; the aluminum-titanium-boron wire obtained in this comparative example has obvious pores, loose structure, poor material cleanliness, Ti content of 3%, B content of 0.5%, and poor product refinement effect.

[0039] The above merely describes the preferred embodiments of the present application, and is not used to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A method for producing an aluminum titanium boron wire, characterized by, It comprises the following steps: S1, melt and heat pure aluminum ingot to 700-800℃; then add fluorinated salt and TiB2 into the aluminum liquid, stir uniformly, remove the surface by-products after the reaction; then add fluorinated salt and TiB2, stir uniformly, remove the surface by-products after the reaction; cool the aluminum liquid after the above alloying reaction to obtain aluminum titanium boron alloy ingot; the fluorinated salt is a mixture of potassium fluorotitanate and potassium fluoroborate; the adding amount of TiB2 is 0.6-1.0wt% of the mass of aluminum ingot; S2, melt and heat the aluminum titanium boron alloy ingot obtained in S1 to 700-800℃, then add slagging agent and stir uniformly, remove the surface by-products after the reaction; then continue to add aluminum fluoride and stir uniformly, while blowing protective gas into the system and stirring sufficiently, remove the surface by-products after standing, repeat the above steps for several times; the slagging agent comprises the following raw materials in mass fraction: mirabilite 30-40 parts, sodium chloride 30-50 parts, potassium chloride 10-20 parts, sodium fluorosilicate 10-20 parts, sodium carbonate 10-20 parts, aluminum fluoride 5-10 parts, boron nitride 5-10 parts; S3, stir the above treated aluminum liquid, stand, and then cast to obtain aluminum titanium boron wire.

2. The method of producing an aluminum titanium boron wire according to claim 1, characterized by, In S1, the mass ratio of the two times of adding fluorinated salt is 6-8:2-4.

3. The method of producing an aluminum titanium boron wire according to claim 2, characterized by, In S1, the mass ratio of potassium fluorotitanate to potassium fluoroborate in the fluorinated salt is 1-3:

1.

4. The method of producing an aluminum titanium boron wire according to claim 1, characterized by, In S1, the TiB2 is added and then kept at 1400-1500℃ for 4-5h.

5. The method of producing an aluminum titanium boron wire according to claim 1, characterized by, In S2, the slagging agent is added at least twice uniformly, and the total adding amount of slagging agent is 0.6-1.0wt% of the mass of aluminum titanium boron alloy ingot.

6. The method of producing an aluminum titanium boron wire according to claim 1, characterized by, In S2, the protective gas is one of argon, nitrogen or helium.

7. The method of producing an aluminum titanium boron wire according to claim 1, characterized by, In S2, the adding amount of aluminum fluoride is 0.5-1.0wt% of the mass of aluminum titanium boron alloy ingot.

8. An aluminum titanium boron wire, characterized by, Prepared by the method of any one of claims 1-7.