Al-M-B grain refiner for casting Al-Si alloy and preparation method thereof

A technology of casting aluminum-silicon alloy and grain refiner, which is applied in the field of aluminum alloy smelting, can solve the problems of poor refinement effect, high Nb content, and easy settlement failure of cast aluminum-silicon alloy, so as to achieve good refinement effect and equipment The effect of simple conditions and convenient operation

Pending Publication Date: 2019-02-26
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problems of the prior art, the purpose of the present invention is to overcome the deficiencies of the prior art, to provide an Al-M-B grain refiner for casting aluminum-silicon alloy and its preparation method, to solv

Method used

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  • Al-M-B grain refiner for casting Al-Si alloy and preparation method thereof
  • Al-M-B grain refiner for casting Al-Si alloy and preparation method thereof
  • Al-M-B grain refiner for casting Al-Si alloy and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0040] Example one

[0041] In this embodiment, see Figure 1 ~ Figure 3 , A method for preparing Al-M-B grain refiner for casting aluminum-silicon alloy, using fluoride salt method, and the steps are as follows:

[0042] a. Raw material preparation:

[0043] Adopt KBF 4 Powder as B source material, using K 2 TiF 6 As the Ti source material, weigh 98.7 grams of Al block, K 2 TiF 6 12.5g powder, 2.5g Nb powder and KBF 4 14.0 grams of powder is used as the raw material, and the weighed raw material already contains the additional weighing K according to the standard that the yield of Ti, Nb and B is not less than 75% 2 TiF 6 Powder, Nb powder and KBF 4 The powder is used as a burnt to supplement the raw material part;

[0044] b. Melting of Al-M-B alloy:

[0045] The raw materials weighed in the step a are mixed, the Al block is melted at 800° C. to obtain an aluminum melt; then the K 2 TiF 6 Powder, Nb powder, KBF 4 After mixing the powder, add it to the aluminum melt and stir for 60 sec...

Example Embodiment

[0053] Example two

[0054] This embodiment is basically the same as the first embodiment, and the special features are:

[0055] In this embodiment, see Figure 7 ~ Figure 9 , A method for preparing Al-M-B grain refiner for casting aluminum-silicon alloy, adopts fluoride salt method, and its steps are as follows:

[0056] a. Raw material preparation:

[0057] Adopt KBF 4 Powder as B source material, using K 2 TiF 6 As the Ti source material, weigh 99.4 grams of Al block, K 2 TiF 6 22.3 grams of powder, 2.2 grams of Nb powder and KBF 4 19.4 grams of powder is used as the raw material, and the weighed raw material already contains additional K according to the standard that the yield of Ti, Nb and B is not less than 75% 2 TiF 6 Powder, Nb powder and KBF 4 The powder is used as a burnt to supplement the raw material part;

[0058] b. This step is the same as the first embodiment.

[0059] Experimental test analysis:

[0060] X-ray diffraction and Rietveld were used to refine and analyze the...

Example Embodiment

[0062] Example three

[0063] The foregoing description of this embodiment is basically the same as the embodiment, and the special features are:

[0064] In this embodiment, see Figure 10 ~ Figure 13 , A method for preparing Al-M-B grain refiner for casting aluminum-silicon alloy, adopts fluoride salt method, and its steps are as follows:

[0065] a. Raw material preparation:

[0066] Adopt KBF 4 Powder as B source material, using K 2 TiF 6 As the Ti source material, weigh 97.2 grams of Al block, K 2 TiF 6 11.0g powder, 4.3g Nb powder and KBF 4 10.8 grams of powder is used as the raw material, and the weighed raw material already contains additional K according to the standard that the yield of Ti, Nb and B is not less than 75% 2 TiF 6 Powder, Nb powder and KBF 4 The powder is used as a burnt to supplement the raw material part;

[0067] b. This step is the same as the first embodiment.

[0068] Experimental test analysis:

[0069] X-ray diffraction and energy spectrometer were used to...

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Abstract

The invention provides an Al-M-B grain refiner for casting an Al-Si alloy and a preparation method thereof. The Al-M-B refiner for casting the Al-Si alloy is composed of the components by mass: 85.0-96.0% of Al, 3.5-10.0% of M and 0.5-5.0% of B; the Al-M-B refiner contains refined particle phase MAl3 and MB2. The Al-M-B grain refiner is prepared by a fluoride salt method with Al blocks, K2TiF6 powder, Nb powder and KBF4 powder as raw materials. The Al-M-B alloy is prepared by melting. The prepared Al-M-B refiner can refine the grain size of alpha-Al in a high-silicon aluminum alloy to 700 microns or less, optimally to 200 microns or less; the amount of Nb is reduced and the cost of raw materials is reduced; the Al-M-B refiner has durable performance and is not easy to settle down and fail,and the refinement effect can still be less than 350 microns after heat preservation is performed for 2 h; the preparation method has the advantages of simple equipment conditions required for preparation and simple operation, and is suitable for industrial production.

Description

technical field [0001] The invention relates to a metal material additive and a preparation method thereof, in particular to a refiner for casting aluminum-silicon alloys and a preparation method thereof, which is applied in the technical field of aluminum alloy smelting. Background technique [0002] Cast aluminum-silicon alloys are widely used in industry due to their good mechanical properties and excellent casting properties. Refining the grains of the alloy can obtain a dense alloy structure, and at the same time reduce the tendency of hot cracking and segregation of the casting, and reduce the porosity, thereby improving the overall performance of the alloy. The most commonly used and effective refinement method is to add grain refiner, among which Al-5Ti-B refiner has been widely used. However, this refiner is not suitable for refining aluminum-silicon alloys with high silicon content (greater than 5% Si), the main reason is that silicon elements interact with titani...

Claims

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Application Information

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IPC IPC(8): C22C1/03C22C21/02C22C21/00C22C1/02
CPCC22C1/02C22C1/03C22C21/00C22C21/003C22C21/02
Inventor 李谦黎阳
Owner SHANGHAI UNIV
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