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Method for preparing Al-Ti-B (aluminum-titanium-boron intermediate) alloy from titanium hydride and potassium fluoborate

A technology of potassium fluoroborate and master alloy, which is applied in the field of metallurgical smelting, which can solve the problems of harmful fluoride and large gas emissions, and achieve the effects of simple production process, small displacement and wide source of raw materials

Active Publication Date: 2014-04-02
KUNMING METALLURGY INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is in order to solve the problem that fluoride-containing harmful gas discharges in a large amount in the method for preparing Al-Ti-B master alloy refining agent by fluorine salt method, can obtain required Al-Ti-B master alloy again simultaneously, thereby Provide a method for preparing Al-Ti-B master alloy with titanium hydride and potassium fluoroborate

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Dry titanium hydride at 35°C for 1 hour and set aside; weigh 780 g of pure aluminum block and put it into a crucible and heat it to 750°C to melt the pure aluminum block, then add 23 g of dried titanium hydride and fluoroboric acid in sequence Potassium powder 68 g, titanium hydride powder wrapped into several equal packets with aluminum foil, quickly added to the bottom of the furnace with a graphite bell jar, and stirred evenly at a speed of 300rpm, then potassium fluoroborate was added, and stirred evenly at a speed of 100rpm~600rpm, then Keep it warm at 750°C for 30 minutes to obtain the aluminum alloy melt; then purify the aluminum alloy melt, add refining agent and stir at 300 rpm for 2 minutes, let it stand for 8 minutes, then remove the slag, and then put the aluminum alloy melt at 800 ℃ temperature, cast out of the furnace, and water-cooled to obtain the Al-Ti-B master alloy refiner. TiAl in its alloy 3 and TiB 2 The particle shape of the second phase is good...

Embodiment 2

[0022] Dry titanium hydride at 35°C for 1 hour and set aside; weigh 780 g of pure aluminum block and put it into a crucible and heat it to 750°C to melt the pure aluminum block, then add 31g of dried titanium hydride and potassium fluoroborate in sequence Powder 77g, titanium hydride powder wrapped in aluminum foil into several small packets of the same amount, quickly added to the bottom of the furnace with a graphite bell jar, and stirred evenly at a speed of 300rpm, then potassium fluoroborate was added, and stirred evenly at a speed of 100rpm~600rpm, and then stirred at a speed of 800rpm ℃ for 30 minutes to obtain the aluminum alloy melt; to purify the aluminum alloy melt, add refining agent and stir at 300rpm for 2 minutes, let it stand for 8 minutes, then remove the slag, and then put the aluminum alloy melt at 800 ℃ Casting out of the furnace at high temperature and cooling with water, the Al-Ti-B master alloy refiner is obtained. TiAl in its alloy 3 and TiB 2 The par...

Embodiment 3

[0024] Dry titanium hydride at 35°C for 1 hour and set aside; weigh 780 g of pure aluminum block and put it into a crucible and heat it to 750°C to melt the pure aluminum block, then add 39 g of dried titanium hydride and potassium fluoroborate in sequence 87g of powder, titanium hydride powder wrapped in aluminum foil into several small packets of equal quantity, quickly added to the bottom of the furnace with a graphite bell jar, and stirred evenly at a speed of 300rpm, then potassium fluoroborate was added, and stirred evenly at a speed of 100rpm~600rpm, and then heated at 850 ℃ for 30 minutes to obtain the aluminum alloy melt; to purify the aluminum alloy melt, add refining agent and stir at 300rpm for 2 minutes, let it stand for 8 minutes, then remove the slag, and then put the aluminum alloy melt at 800 ℃ Casting out of the furnace at high temperature and cooling with water, the Al-Ti-B master alloy refiner is obtained. TiAl in its alloy 3 and TiB 2 The particle shape ...

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Abstract

The invention discloses a method for preparing an Al-Ti-B (aluminum-titanium-boron intermediate) intermediate alloy refiner from titanium hydride and potassium fluoborate. The preparation method comprises the following steps: weighing 1 to 10 mass percent of dried titanium hydride, 8 to 15 mass percent of potassium fluoborate powder and 75 to 90 mass percent of industrial pure aluminum blocks; placing the aluminum blocks in a crucible, heating the aluminum blocks to 730 to 950 DEG C for melting, sequentially adding the titanium hydride and the potassium fluoborate powder, uniformly stirring the mixture at speed of 100 to 600 rpm, and preserving the heat to obtain aluminum alloy melt; purifying the aluminum alloy melt, pouring and discharging the purified aluminum alloy melt out of a furnace at temperature of 700 to 950 DEG C, and performing water cooling to obtain an Al-Ti-B intermediate alloy. The preparation method has the advantages that a production process is simple, the raw materials are extensive, a small amount of harmful fluoride is emitted, and the microstructure of the prepared Al-Ti-B intermediate alloy contains ideal TiAl3 and TiB2 second-phase particles.

Description

technical field [0001] The invention belongs to the field of metallurgical smelting, and in particular relates to a method for preparing an aluminum-titanium-boron master alloy by using titanium hydride and potassium fluoroborate. Background technique [0002] Al-Ti-B master alloy refiner is currently the most widely used grain refiner for aluminum and aluminum alloys. About 75% of the aluminum industry in the world uses Al-Ti-B master alloy for grain refinement. At present, there are many methods for producing Al-Ti-B master alloy, and the fluorine salt method is mainly used in industry. The fluoride salt method is to add the alkali metal fluoride salt of Ti and B to the molten aluminum in a certain proportion, and form an Al-Ti-B master alloy through a certain process, but the raw material used in the fluoride salt method is a fluorine-containing compound , especially the addition of potassium fluorotitanate up to 10%, a large amount of fluoride is released in the reactio...

Claims

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Application Information

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IPC IPC(8): C22C1/03C22C21/00C22C1/02
Inventor 杨钢卢育汤皓元陈越闫洪李玉章
Owner KUNMING METALLURGY INST
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