Preparation method for adding atomic-scale Ce element into aluminum and aluminum alloy

Abstract

The invention relates to a preparation method for adding an atomic-scale Ce element into aluminum and aluminum alloy through a Ce-organic metal framework, which comprises the following steps: (1) fully mixing and dissolving (trichloromethyl) carbonate in a certain amount of ethanol aqueous solution to obtain a solution A, (2) fully mixing and dissolving soluble cerium salt in a certain amount of distilled water to obtain a solution B, and (3) adding an atomic-scale Ce element into the solution B to obtain a solution C; (3) stirring and adding the solution A into the solution B at room temperature, standing for 2 hours, centrifuging and washing with distilled water to obtain black powder C; and (4) the dried black powder C is coated with aluminum foil and added into pure aluminum or aluminum alloy melt, the melt temperature ranges from 690 DEG C to 760 DEG C, degassing and impurity removal are conducted on the melt, the melt is poured into a corresponding mold after even stirring is conducted, and the aluminum or aluminum alloy with the atomic-scale Ce element added can be obtained. Compared with the prior art, the Al-Ce intermediate alloy is directly added in a melt in an atomic-scale Ce mode, the processing flow of a traditional Al-Ce intermediate alloy is reduced, the preparation method is simple and mild, the adding amount of Ce can be obviously reduced, and the purposes of reducing cost and improving efficiency are achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of new materials and relates to a preparation method for adding atomic-level Ce elements into aluminum and aluminum alloys. Background Art

[0002] The rare earth element Ce (Ce), due to its unique chemical properties, plays a crucial role in aluminum alloys. Ce can significantly improve the metallurgical quality and various properties of aluminum alloys, such as casting fluidity, strength, and ductility. Therefore, adding Ce to aluminum and aluminum alloys is a popular technique among researchers. Currently, numerous methods exist, including adding Ce elemental elements, Al-Ce master alloys, and powder metallurgy. These methods require complex processing to produce Ce elemental elements, Al-Ce master alloys, or powder metallurgy products, increasing the manufacturing cost of Ce addition. This patent proposes a simple and effective method for directly adding Ce-organic metal frameworks (Ce-MOFs) to aluminum and aluminum alloy melts. Since Ce exists in atomic form within Ce-MOFs, after addition to the aluminum and aluminum alloy melt, the organic elements are removed through degassing, deslagging, and impurity removal, while Ce reacts with Al or other elements at the atomic level, achieving direct atomic-level Ce addition to aluminum and aluminum alloys. This method is simple to implement, has a short process, and can reduce the amount of Ce added, providing a promising technical direction for the green and in-depth development and utilization of rare earth Ce resources. Summary of the Invention

[0003] Provided is a preparation method for adding atomic-level Ce elements to aluminum and aluminum alloys. The present invention adds Ce-MOFs (Ce-metal organic frameworks) to aluminum and aluminum alloys. The organic frameworks burn and volatilize in the aluminum melt, so that the atomic-level Ce elements can be distributed inside the aluminum and aluminum alloys.

[0004] The present invention relates to a preparation method for adding atomic-level Ce elements to aluminum and aluminum alloys, comprising the following steps:

[0005] Step 1: Thoroughly dissolve 1-10 mmol of (trichloromethyl) carbonate in 10-100 mL of a mixed solution of ethanol and water (volume ratio 1:1) to obtain solution A.

[0006] Step 2: Thoroughly mix and dissolve a certain amount of soluble cerium salt in 5-25 mL of distilled water to obtain solution B.

[0007] Step 3: Add solution A to solution B at room temperature and stir evenly, let it stand for 2 h, centrifuge and wash with distilled water to obtain black powder C.

[0008] Step 4: Wrap the dried black powder C with aluminum foil and add it to a melt of pure aluminum or aluminum alloy at a melt temperature of 690°C-760°C. Degas and remove impurities from the melt, stir it evenly, and finally pour the alloy melt into the corresponding mold to obtain aluminum or aluminum alloy with atomic-level Ce element added.

[0009] The soluble cerium salt in step 2 is one of cerium nitrate and cerium chloride, and the amount of cerium salt added is between 1 and 10 mmol.

[0010] In the above step 4, the amount of black powder C added is 0.1-5% of the mass of pure aluminum or aluminum alloy.

[0011] Compared with existing master alloy and Ce element addition technologies, the present invention has the following significant features:

[0012] (1) The preparation method of Ce-MOFs involved in the present invention is simple, mild and environmentally friendly.

[0013] (2) The components such as C and N in the Ce-MOFs prepared by the present invention will burn and volatilize in the high-temperature aluminum melt, leaving only atomic-level Ce elements distributed in the aluminum alloy. The reaction activity is high, and the amount of Ce element added can be reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 The morphology and element distribution of Ce-MOFs.

[0015] Figure 2 Comparison of the micromorphology of A356 aluminum alloy with 0.1 wt.% Ce-MOFs added (right) and without Ce atoms added (left). DETAILED DESCRIPTION

[0016] Example 1

[0017] (1) Dissolve 5 mmol of (trichloromethyl) carbonate in 50 mL of ethanol and 50 mL of distilled water to obtain solution A.

[0018] (2) Thoroughly mix and dissolve 5 mmol of soluble cerium salt in 12.5 mL of distilled water to obtain solution B.

[0019] (3) Solution A was stirred and added to solution B, allowed to stand for 2 h, centrifuged, and washed with distilled water to obtain a black powder, namely Ce-MOFs.

[0020] (4) Wrap the dried black powder (with a mass fraction of 0.1% of the total mass of the A356 alloy) with aluminum foil and add it into the A356 aluminum alloy melt. The melt temperature is 740 °C. Remove gas and impurities from the melt. After stirring evenly, pour the alloy melt into a mold to obtain A356 aluminum alloy added with atomic-level Ce element.

Claims

1. A preparation method for adding atomic Ce element to aluminum and aluminum alloys, and the method is characterized in that: (1) Dissolve 1 - 10 mmol of (trichloromethyl) carbonate in a mixed solution of 10 - 100 mL of ethanol and water (volume ratio 1:1) to obtain solution A. (2) Dissolve a certain amount of soluble cerium salt in 5 - 25 mL of distilled water to obtain solution B. (3) Add solution A to solution B at room temperature, stir evenly, let it stand for 2 h, centrifuge and wash it with distilled water until clean to obtain black powder C. (4) Wrap the dried black powder C with aluminum foil and add it to the melt of pure aluminum or aluminum alloy. The melt temperature is 690 °C - 760 °C. Remove gas and impurities from the melt, stir evenly, and finally pour the alloy melt into the corresponding mold to obtain aluminum or aluminum alloy with atomic-level Ce element added.

2. The preparation method according to claim 1, wherein: The soluble cerium salt is one of cerium nitrate and cerium chloride. When preparing solution B, the addition amount of the soluble cerium salt is between 1 - 10 mmol, and the addition amount of the black powder C is 0.1 - 5% of the mass of pure aluminum or aluminum alloy.

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