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The preparation method of different lanthanum cerium content al-5ti-1b-1 (la+ce) master alloy grain refiner

A grain refiner, al-5ti-1b-1 technology, applied in the field of aluminum applications, can solve the problems of pollution of aluminum and its alloys, difficulty in controlling the quality of aluminum products, poisoning of refiners, etc.

Active Publication Date: 2017-01-25
GUANGXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] 1) The second phase in the Al-Ti-B master alloy has TiB 2 , TiAl 3 , AlB 2 ,(Al,Ti)B 2 and other particles, however, less than 1% of the particles actually play the role of heterogeneous nucleation, so the nucleation potential is far from being brought into play;
[0006] 2) The content of impurities in the Al-Ti-B master alloy is relatively high, which pollutes aluminum and its alloys while refining the aluminum and its alloys;
[0007] 3) TiB in Al-Ti-B master alloy 2 The particle size is large (such as 0.5-3μm), and it is easy to aggregate into agglomerates, which greatly reduces the refinement ability of the Al-Ti-B master alloy; TiB 2 It will also react with elements such as Mn, Cr, Zr at the interface, resulting in refiner poisoning
[0008] 4) When the Al-Ti-B master alloy refines aluminum and its alloys, the refinement effect is unstable
Therefore, it is difficult to control the product quality of aluminum products

Method used

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  • The preparation method of different lanthanum cerium content al-5ti-1b-1 (la+ce) master alloy grain refiner
  • The preparation method of different lanthanum cerium content al-5ti-1b-1 (la+ce) master alloy grain refiner
  • The preparation method of different lanthanum cerium content al-5ti-1b-1 (la+ce) master alloy grain refiner

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] 1. According to the ratio of 20%wt RE (100%wt Ce) and 80%wt Al, prepare Al-20 (La+Ce) master alloy by vacuum electric arc furnace;

[0046] 2. according to generating mass percent: 5%Ti, 1%B, 1%(La+Ce), all the other are the quality of Al, take potassium fluorotitanate (K 2 TiF 6 ), potassium fluoroborate (KBF 4 ) and industrial pure aluminum, and K 2 TiF 6 、KBF 4 Mix the powder evenly;

[0047] 3. Clean up the 6# graphite crucible and the tools used in the experimental process, and prepare the coating (20%ZnO+7%Na 2 SiO 3 9H 2 O+73%H 2 O). Apply the paint to the tools used, and the coating should be uniform;

[0048] 4. Turn on the power, set the required temperature of the well-type resistance furnace to 800°C and the required temperature of the box-type resistance furnace to 350°C;

[0049] 5. Put the graphite crucible into the well-type furnace and make it run; put the tools required for the experiment into the box-type furnace and make it run to dry the ...

Embodiment 2

[0056] 1. Prepare Al-20 (La+Ce) master alloy by vacuum electric arc furnace according to the ratio of 20%wt RE (i.e. 100%wt La) and 80%wt Al;

[0057] 2. The following steps are the same as step 2 to step 10 in Example 1, so as to prepare the Al-5Ti-1B-1 (La+Ce) master alloy grain refiner of 100%wt La (0%wt Ce). Its XRD phase analysis diagram and SEM microstructure diagram are respectively figure 2 , Figure 8 .

Embodiment 3

[0059] 1. According to the ratio of 20%wt RE (20%wt La+80%wt Ce) and 80%wt Al, prepare Al-20 (La+Ce) master alloy by vacuum electric arc furnace;

[0060] 2. The following steps are the same as step 2 to step 10 in Example 1, so as to prepare an Al-5Ti-1B-1 (La+Ce) master alloy grain refiner with 20%wt La (80%wt Ce). Its XRD phase analysis diagram and SEM microstructure diagram are respectively image 3 , Figure 9 .

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Abstract

The invention discloses a method for preparing an Al-5Ti-1B-1RE intermediate alloy grain refiner having different content of lanthanum and cerium. The Al-5Ti-1B-1RE intermediate alloy grain refiner is prepared by a fluorine salt reaction method. La and Ce are added into an Al-Ti-B intermediate alloy to generate compounds of Al, Ti, La and Ce, namely, Ti2Al20La and Ti2Al20Ce. By designing Al-Ti-B-(La+Ce) intermediate alloys having different percentage content of lanthanum and cerium, the Al-Ti-B-(La+Ce) intermediate alloy grain refiner having optimal percentage content of lanthanum and cerium is sought. The method has the beneficial effects that second phase particles TiB2, TiAl3, Ti2Al20La and Ti2Al20Ce in the Al-Ti-B-(La+Ce) intermediate alloy grain refiner having optimal percentage content of lanthanum and cerium are fine and uniformly dispersed and meet the usage requirements of sheets or foils; the Al-Ti-B-(La+Ce) intermediate alloy grain refiner having optimal percentage content of lanthanum and cerium, which is prepared by the method, has better grain refining capacity on industrial pure aluminum and alloys thereof than that of the Al-Ti-B intermediate alloy grain refiner at home and abroad under the same conditions.

Description

technical field [0001] The invention belongs to the technical field of aluminum application. Specifically, the invention relates to a preparation method of Al-5Ti-1B-1 (La+Ce) master alloy grain refiners with different lanthanum and cerium contents. Background technique [0002] Pure aluminum has a low melting point (660°C), low density (ρ=2.7×10 3 Kg / m 3 ), high plasticity (ψ=80%), low strength (σ b =80MPa) and other characteristics. The density of aluminum alloy is also very small, and the strength after heat treatment is high, σ b =490~588Mpa, therefore, aluminum alloy has very high specific strength (σ b / ρ), is an important aerospace structural material. Moreover, pure aluminum conducts heat and electricity well, second only to silver and copper. And because the surface of aluminum is very easy to form dense Al 2 o 3 Oxide film, therefore, aluminum has good corrosion resistance. Because aluminum and its alloys have such excellent properties, they are widely us...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/03C22C21/00C22C1/06C22C1/02
Inventor 李逸泰尹建宝胡治流赵艳君曾建民许征兵
Owner GUANGXI UNIV