Al-Ti-Nb-B refiner for casting aluminum-silicon alloy as well as preparation method thereof and application thereof

The technology of al-ti-nb-b and refining agent is applied in the field of aluminum alloy smelting, which can solve the problems of high cost, poor refining effect and high Nb content, so as to reduce the cost of raw materials, achieve good refining effect and ensure the composition and the effect of tissue uniformity

Active Publication Date: 2018-07-06
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a kind of Al-Ti-Nb-B refining agent and its preparation method and the application of refining agent used in cast aluminum-silicon alloy, to solve the problem of finer refining agent used in casting aluminum-silicon alloy with high silicon content. Poor refining effect and high Nb content in the refiner lead to technical problems of high cost

Method used

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  • Al-Ti-Nb-B refiner for casting aluminum-silicon alloy as well as preparation method thereof and application thereof
  • Al-Ti-Nb-B refiner for casting aluminum-silicon alloy as well as preparation method thereof and application thereof
  • Al-Ti-Nb-B refiner for casting aluminum-silicon alloy as well as preparation method thereof and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0033] The preparation method of the present embodiment Al-Ti-Nb-B refiner comprises the following steps:

[0034] Step 1) The weighing of raw materials is carried out according to the nominal composition: 97.52 wt.% Al, 1.24 wt.% Ti, 0.80 wt.% Nb and 0.44 wt.% B, and the Al block (length, width and height are not greater than 8 mm, purity 99.9 wt.%) 19.695 g, Ti particles (diameter not larger than 3 mm, purity 99.9 wt.%) 0.255 g, Nb particles (diameter not larger than 3 mm, purity 99.9 wt.%) 0.168 g and B particles (diameter not greater than 2 mm, purity 99.5 wt.%) 0.089 g as raw material, additionally weigh 1% of the above-mentioned Al mass as burning loss;

[0035] Step 2) The smelting of Ti-Nb-B master alloy adopts a non-consumable arc melting furnace, under the protection of high-purity argon, and smelts the Ti-Nb-B master alloy according to a conventional process;

[0036] Step 3) Melting of Al-Ti-Nb-B refining agent, adding Al block to Ti-Nb-B master alloy for smelting...

Embodiment 2

[0047] The preparation steps not specifically described are the same as in Example 1, except that: the step 1) weighing of raw materials, according to the nominal composition: 97.58 wt. %Al, 0.70 wt. % Ti, 1.34 wt.% Nb and 0.38 wt. % B, weigh 19.716 grams of Al block, 0.143 grams of Ti particles, 0.264 grams of Nb particles and 0.076 grams of B particles as raw materials.

[0048] The final alloy obtained in this embodiment is recorded as Al-0.70Ti-1.34Nb-0.38B.

[0049] The microstructure of the Al-Ti-Nb-B refiner prepared in this embodiment is analyzed by X-ray diffraction, as Figure 5 As shown, its phase composition is 97.29 wt.% of α-Al, 1.55 wt.% of (Ti,Nb)Al 3 and 0.86 wt.% of (Ti,Nb,Al)B 2 .

[0050] The microstructure of the Al-Ti-Nb-B refiner prepared in this embodiment is analyzed by scanning electron microscope, as Image 6 Shown, (Ti,Nb)Al 3 The particle size is 2~3 microns, dispersed in the alloy in an irregular shape; (Ti,Nb,Al)B 2 The particle size is 1~2...

Embodiment 3

[0054] The preparation steps not specifically described are the same as in Example 1, except that: the step 1) weighing of raw materials, according to the nominal composition: 97.48 wt. %Al, 0.32 wt. % Ti, 1.87 wt.% Nb and 0.33 wt. % B, weigh 19.689 grams of Al block, 0.064 grams of Ti particles, 0.382 grams of Nb particles and 0.068 grams of B particles as raw materials.

[0055] The final alloy obtained in this embodiment is recorded as Al-0.32Ti-1.87Nb-0.33B.

[0056] The microstructure of the Al-Ti-Nb-B refiner prepared in this embodiment is analyzed by X-ray diffraction, as Figure 8 As shown, its phase composition is 97.77 wt.% of α-Al, 1.44 wt.% of (Ti,Nb)Al 3 and 0.79 wt.% of (Ti,Nb,Al)B 2 .

[0057] The microstructure of the Al-Ti-Nb-B refiner prepared in this embodiment is analyzed by scanning electron microscope, as Figure 9 Shown, (Ti,Nb)Al 3 The particle size is less than 20 microns, dispersed in the alloy in an irregular shape; (Ti, Nb, Al) B 2 The particl...

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Abstract

The invention discloses an Al-Ti-Nb-B refiner for casting aluminum-silicon alloy as well as a preparation method thereof and application thereof. The Al-Ti-Nb-B refiner for casting aluminum-silicon alloy is prepared from the following components in percentage by weight: 96.20-98.90wt% of Al, 0.30-1.30wt% of Ti, 0.50-2.0wt% of Nb, and 0.30-0.50wt% of B. The Al-Ti-Nb-B refiner comprises a refining particle phase MA13 and MB2 with mass percentage of 2-4% and particle dimension smaller than 20 microns, wherein M is Ti or Nb. The preparation method for the Al-Ti-Nb-B refiner for casting aluminum-silicon alloy comprises the following steps of: a, weighing raw materials; b, smelting a Ti-Nb-B intermediate alloy; and c, smelting the Al-Ti-Nb-B refiner. A method of applying the Al-Ti-Nb-B refiner to casting aluminum-silicon alloy comprises the following steps of: a, melting the aluminum-silicon alloy; b, adding the Al-Ti-Nb-B refiner; and c, casting. The Al-Ti-Nb-B refiner prepared by the preparation method can be used for refining the crystalline grain size of alpha-Al in the aluminum-silicon alloy to be 150-450 microns, so that Nb content is greatly reduced, raw material cost is reduced,and components and structure uniformity of the prepared Al-Ti-Nb-B refiner are guaranteed.

Description

technical field [0001] The invention belongs to the field of aluminum alloy smelting, and in particular relates to an Al-Ti-Nb-B refiner for casting aluminum-silicon alloys and a preparation method and application thereof. 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 5wt.% Si). The main reason is that silicon interacts with titanium elements to form toxic titanium silicides, which mak...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/06C22C21/00C22C1/03
CPCC22C1/026C22C1/03C22C1/06C22C21/00
Inventor 李谦黎阳罗群
Owner SHANGHAI UNIV
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