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Refining agent for crystalline grain of aluminium titanium carbon intermediate alloy

A technology of grain refiner and master alloy, applied in the field of AlTiC grain refiner, can solve the problem of low grain refinement effect, etc., and achieve the effect of good grain refinement effect

Inactive Publication Date: 2003-05-21
ZHUOZHOU JINGYING ALUMINUM ALLOY MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Such as Al6Ti0.02C, its disadvantage is that the grain refinement effect is not high

Method used

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  • Refining agent for crystalline grain of aluminium titanium carbon intermediate alloy
  • Refining agent for crystalline grain of aluminium titanium carbon intermediate alloy

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0040] Use graphite crucible to melt 20kg99.7% Al and 1.1kg titanium sponge to aluminum and add sponge titanium to make Al5Ti alloy melt at a temperature of 800°C-900°C. Use the rotor of the rotary refining device to feed nitrogen or argon into 80 at 200rpm. gram of graphite powder, the carbon reacts with the titanium in the melt to form TiC. Graphite powder is kept at 200°C for more than 2 hours to remove moisture before use, and the average particle size is 20μm. The melt is overheated to above 1300°C for 5-10 minutes before casting to remove Al 4 C 3 and Ti 3 The cladding layer formed by AlC around TiC avoids weakening or destroying the effective nucleation ability of α-Al, and then the prepared AlTiC melt is completely cleaned of scum and cast into the required ingot. The result of quantitative analysis of carbon content of the AlTiC master alloy thus prepared was 0.35% C, and the result of grain refinement was that the average grain size of the sample was 85 μm.

example 2

[0042] According to Example 1, use 99.7% Al20kg, add 5.6kg KTF6 (potassium fluorotitanate) and 85 grams of activated carbon at a temperature of 750°C-800°C to react for 20-30 minutes, remove the scum, and heat up to 1100°C to add 0.16% AlTiC master alloy, the average grain size of the grain-refined sample is 97m.

example 3

[0044] According to Example 1, add 2 kg of Al-5% Ti melt in a graphite crucible with a capacity of 5 kg at a temperature of 850 ° C, add 30 grams of carbon ink on the clean melt surface, and stir gently with a graphite rod for 10-15 minutes. The AlTiC alloy containing 0.05% C was prepared at the reaction temperature of ℃, and the average grain size of the cast sample was 145 μm. The refinement effect of the melt has not declined significantly after being kept in the mold at 725°C±5°C for 330 minutes.

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Abstract

The aluminium titanium carbon intermediate alloy grain thinning agent relates to a AlTiC grain thining agent containing TiC granules for thinning aluminium and aluminium alloy and its preparation method. It is characterized by that said alloy composition contains (wt%) 3%-6% of Ti anjd 0.02%-0.5% of C, the reset is aluminium and inevitable impurity, in which the ratio of Ti:C is 25:1. Its preparation method is characterized by that the carbon powder prepared by using one selected from industrial graphite, natural graphite, amorphous graphite, active carbon and carbon black carbon is introduced into aluminium melt by means of graphite rotor of rotary refining equipment and stirred until the aluminium melt contains no monomer carbon.

Description

technical field [0001] An aluminum-titanium-carbon master alloy grain refiner relates to an AlTiC grain refiner containing TiC particles for refining aluminum and aluminum alloys and a preparation method for the alloy grain refiner. Background technique [0002] Since the end of the 1960s, the Al-Ti-B master alloy grain refiner has been the preferred refiner in the aluminum industry. Product metal clarity and grain refinement effects have been greatly improved. The quality of Al-Ti-B in the 1990s has been greatly improved compared to before. For example, the grain size of 99.7% industrial pure aluminum was about 150 μm in the 1990s, while it was above 200 μm before. Nevertheless, existing TiB 2 Particle aggregation defect, the aluminum industry has long hoped for an acceptable Al-Ti-B substitute. [0003] It has been demonstrated that TiC-containing grain refiners are less present with TiB 2 Particle aggregation-related defects, TiC particles have little tendency to aggr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/02C22C1/06C22C32/00
Inventor 高泽生
Owner ZHUOZHOU JINGYING ALUMINUM ALLOY MATERIAL
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