A kind of composite modificator doped with rare earth metal and its preparation method, and the preparation method of al-si casting aluminum alloy
A composite modifier and a technology for casting aluminum alloys, applied in the field of casting aluminum alloys, can solve the problems of increased casting defects, easy oxidation and burning loss, and easy Sr inhalation.
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[0031] The preparation method of the rare earth metal-doped composite modificator provided in the embodiment of the present invention includes a metallurgical step and an atomized pulverization step carried out in sequence. Among them, the metallurgical step includes melting the aluminum material and the raw materials containing Sr and RE to obtain the melt; the atomization powder making step includes atomizing the melt into Al-Sr-RE metal powder, and the metal powder contains Al 4 (SrRE) phase and Al 11 RE 3 Mutually. For the composite modifier of this formula, the method combines metallurgy, atomization pulverization and cold pressing to prepare an Al-Sr-RE composite modifier with high Sr and RE content, and Al-Sr- The RE composite modificator contains Al with fine grains and uniform distribution4 (SrRE) phase and Al 11 RE 3 Compared with the traditional Sr modifier, it has the advantages of lower addition amount during modification, short incubation time, long aging tim...
Embodiment 1
[0042] This embodiment provides a rare earth metal-doped composite modifier, which includes the following components in terms of mass percentage: 8.5% of Sr, 15% of Ce and 76.5% of Al;
[0043] It is prepared by the following method:
[0044] S1: Put the pure aluminum material into the intermediate frequency furnace and raise the temperature to 800°C; after the aluminum material is completely melted, add a covering agent with a mass of 0.02% of the melt, and then use a Ti alloy bell jar to press the material containing Sr and Ce into the melt;
[0045] S2: Raise the temperature to 900°C, and after the raw materials are completely melted, take samples to test the components; then pass high-purity argon gas with a purity of 99.99% into the melt for 10 minutes;
[0046] S3: Atomize the melt into metal powder under the protection of nitrogen, and the atomization pressure is 2MPa;
[0047] S4: Collect the powder, use a hydraulic press to make a cylindrical cake with a weight of 10...
Embodiment 2
[0049] This embodiment provides a rare earth metal-doped composite modifier, which includes the following components in terms of mass percentage: 9.5% of Sr, 18% of La and 72.5% of Al;
[0050] It is prepared by the following method:
[0051] S1: Put the pure aluminum material into the intermediate frequency furnace and raise the temperature to 750°C; after the aluminum material is completely melted, add a covering agent with a mass of 0.02% of the melt, and then use a Ti alloy bell jar to press the material containing Sr and La into the melt;
[0052] S2: Raise the temperature to 960°C, and after the raw materials are completely melted, take samples to test the components; then pass high-purity argon gas with a purity of 99.99% into the melt for 15 minutes;
[0053] S3: Atomize the melt into metal powder under the protection of nitrogen, and the atomization pressure is 3MPa;
[0054] S4: Collect the powder, use a hydraulic press to make a cylindrical cake with a weight of 20...
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Abstract
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