Al-TiO2-C grain refiner, preparation method thereof and commercial-purity aluminum refining method

A grain refiner, al-tio2-c technology, applied in Al-TiO2-C grain refiner and its preparation, in the field of industrial pure aluminum refinement, can solve the problem of insignificant refinement effect and fine TiC particles It is not easy to control, poor anti-recession performance, etc., to achieve good grain refinement effect, excellent grain refinement effect, and moderate quantity.

Inactive Publication Date: 2015-10-28
INNER MONGOLIA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, studies have confirmed that the refining effect of Al-Ti-C grain refiner is unstable and the anti-fading performance is poor
TiC particles in the Al-Ti-C grain refiner are small and difficult to control. When the content is too small, the refining effect is not significant. If the content is too high, the TiC particles will segregate together and sink to the bottom of the melt in order to reduce the energy. Can not achieve the effect of refinement, Al-Ti-C grain refiner has not been widely used

Method used

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  • Al-TiO2-C grain refiner, preparation method thereof and commercial-purity aluminum refining method
  • Al-TiO2-C grain refiner, preparation method thereof and commercial-purity aluminum refining method
  • Al-TiO2-C grain refiner, preparation method thereof and commercial-purity aluminum refining method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Example 1 Al-TiO 2 -The preparation method of C grain refiner

[0041] 1. Material preparation

[0042] In this embodiment, Al powder (purity is 99.9%, particle size is 40-50 μ m), TiO 2 Powder C (purity 99.9%, particle size 30nm) and C powder (purity 99.9%, particle size 30-95 μm) are raw materials.

[0043] 2. Preparation method

[0044] This embodiment prepared 6 different C:TiO 2 Ratio [All C:TiO appearing in the abstract of the specification, abstract drawings, claims, specification and drawings of the specification of the present invention 2 Both refer to the amount of substance of C and TiO 2 The ratio of the amount of substance, no longer repeat them one by one] Al-TiO 2 -C grain refiner. C:TiO 2 The molar ratios are 0, 1:30, 1:25, 1:20, 1:15, 1:10 in turn. Al powder, TiO 2 Powder [TiO in this embodiment 2 The amount of powder added is Al powder, TiO 2 10wt% of the total mass of C powder and C powder], C powder mixed, ball milled on a star ball mill ...

Embodiment 2

[0050] Embodiment 2 Refining method of industrial pure aluminum

[0051] 1. Raw materials and refinement methods of industrial pure aluminum

[0052] Al-TiO prepared with embodiment 1 2 -C grain refiner and industrial pure aluminum are used as raw materials for refinement test; the refinement test is carried out in a crucible resistance furnace, in which Al-TiO 2 The mass of the -C grain refiner is 0.2wt% (mass fraction, the same below) of the mass of industrial pure aluminum. Use a graphite crucible to melt industrial pure aluminum in a crucible resistance furnace. After the temperature rises to 750°C and keep it warm for 30 minutes, add the grain refiner preheated to 250°C into the graphite crucible and stir to make the grain refiner Evenly distributed in pure aluminum. After 30 minutes of heat preservation, it is poured into the KBI standard mold preheated at 200°C, and the pouring temperature is 700°C.

[0053] 2. Different C:TiO 2 Thinning effect than refiner

[005...

Embodiment 3

[0061] In this example Al-TiO 2 The difference between the preparation method of -C grain refiner and embodiment 1 is:

[0062] (1) The amount of C and TiO 2 The ratio of the amount of substance (C:TiO 2 ) is fixed at 1:20;

[0063] (2) Add the following ball milling solvent during ball milling: 1,4-butanediamine, or ethanol, or acetone, or a mixed solvent with a volume ratio of 1,4-butanediamine and ethanol of 2:1, or a volume ratio of ethanol and acetone It is a mixed solvent of 1:3, or a mixed solvent of 1,4-butanediamine, ethanol and acetone with a volume ratio of 2:1:3; after ball milling, dry until the ball milling solvent evaporates completely.

[0064] The Al-TiO that this embodiment makes 2 -C grain refiner is used for industrial pure aluminum refinement, other test conditions are the same as in Example 2, and the test results are shown in Table 1 below:

[0065] Table 1

[0066]

[0067]

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Abstract

The invention discloses an Al-TiO2-C grain refiner, a preparation method thereof and a commercial-purity aluminum refining method. The Al-TiO2-C grain refiner is composed of Al powder, TiO2 powder and C powder. The preparation method of the Al-TiO2-C grain refiner comprises the steps that 1, the Al powder, the TiO2 powder and the C powder are mixed and then processed on a star type ball mill through ball milling for 0.5-2 h; 2, a precast block with the diameter phi being 30 is pressed on a universal tester, wherein 85 KN pressure is used for block pressing; 3, the precast block is wrapped by aluminum foil, and air between the precast block and the aluminum foil is extruded for storage; 4, the precast block is sintered in a high-temperature sintering furnace; and 5, furnace cooling is carried out, then the sintered precast block is taken out, and therefore the prepared Al-TiO2-C grain refiner is obtained. Precipitated phases of the prepared Al-TiO2-C grain refiner are TiC, Al2O3 and Al3Ti phases. The Al-TiO2-C grain refiner has the good grain refining effect. By adjusting the ratio of C to TiO2, the TiO2 addition, pressure needed for precast block preparation and the like, Al2O3 with the appropriate amount is contained in the Al-TiO2-C grain refiner structure and distributed in a relatively dispersed mode, and the better grain refining effect is achieved.

Description

technical field [0001] The invention relates to a refining agent and a method for refining aluminum, in particular to Al-TiO 2 -C grain refining agent and its preparation method and industrial pure aluminum refining method. Background technique [0002] Grain refinement plays an important role in improving the quality of aluminum and its alloys. Adding a grain refiner is the simplest and most effective way to improve the comprehensive performance of aluminum. The grain refiner contains potential nucleating particles, which inhibit the growth of columnar crystals after being added to the aluminum melt, thereby forming uniform and fine equiaxed crystals. Fine grains can not only reduce defects such as microscopic shrinkage cavities, but also reduce the size of the second phase, and ultimately improve the mechanical properties of aluminum. At present, the commonly used refiner is Al-Ti-B grain refiner, but Al-Ti-B refiner has some disadvantages, such as TiB 2 Particles are ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/06C22C21/00
Inventor 张瑞英赵鸽韩小伟
Owner INNER MONGOLIA UNIV OF TECH
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