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Preparation method of Al-Ti-Nb-B refiner for casting aluminum-silicon alloy

A technology for casting aluminum-silicon alloy and al-ti-nb-b, which is applied in the field of refining agent for casting aluminum-silicon alloy and its preparation, and the refining agent for Al-Ti-Nb-B casting aluminum-silicon alloy and its preparation field , which can solve the problems of cumbersome preparation process casting aluminum silicon alloy and so on

Pending Publication Date: 2020-12-08
SHANGHAI UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] High-cost preparation methods and cumbersome preparation processes will limit the amount and effect of cast aluminum-silicon alloys to a certain extent. Therefore, with the advancement of automobile lightweight, there is an urgent need for a low-cost, easy-to-operate and effective Method for refining high-silicon-content aluminum-silicon alloy

Method used

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  • Preparation method of Al-Ti-Nb-B refiner for casting aluminum-silicon alloy
  • Preparation method of Al-Ti-Nb-B refiner for casting aluminum-silicon alloy
  • Preparation method of Al-Ti-Nb-B refiner for casting aluminum-silicon alloy

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Embodiment 1

[0064] In this embodiment, a method for preparing an Al-Ti-Nb-B refiner for casting aluminum-silicon alloys comprises the following steps:

[0065] a. Weighing of raw materials:

[0066] Using Nb 2 o 5 As Nb source, Al bulk as Al source, K 2 TiF 6 powder as Ti source, KBF 4 powder as the B source; according to the composition ratio of the preparation target Al-Ti-Nb-B refiner, the raw material batching is carried out, and the raw material batching adopts the following mass percentages for batching:

[0067] Weigh 395.35 grams of Al block, K 2 TiF 6 Powder 66.87g, KBF 4 Powder 31.06g, Nb 2 o 5 Powder 19.07 grams is used as raw material, and additionally takes 1% of Al mass as burning loss;

[0068] b. Melting of Al-Ti-Nb-B refiner:

[0069] b-1. Melting the raw material Al block weighed in the step a at 1000° C. to obtain an aluminum melt;

[0070] b-2. Nb to be weighed in said step a 2 o 5 Powder, K 2 TiF 6 Powder, KBF 4 After the powder is mixed evenly, add i...

Embodiment 2

[0083] This embodiment is basically the same as Embodiment 1, especially in that:

[0084] In this embodiment, a method for preparing an Al-Ti-Nb-B refiner for casting aluminum-silicon alloys comprises the following steps:

[0085] a. Weighing of raw materials:

[0086] Using Nb 2 o 5 As Nb source, Al bulk as Al source, K 2 TiF 6 powder as Ti source, KBF 4 powder as the B source; according to the composition ratio of the preparation target Al-Ti-Nb-B refiner, the raw material batching is carried out, and the raw material batching adopts the following mass percentages for batching:

[0087] Weigh 394.46 grams of Al block, K 2 TiF 6 Powder 44.67g, KBF 4 Powder 31.06g, Nb 2 o 5 Powder 25.41 grams is used as raw material, and additionally takes 1% of Al mass as burning loss;

[0088] b. Melting of Al-Ti-Nb-B refiner:

[0089] b-1. Melting the raw material Al block weighed in the step a at 800° C. to obtain an aluminum melt;

[0090] b-2. Nb to be weighed in said step ...

Embodiment 3

[0098] This embodiment is basically the same as the previous embodiment, and the special features are:

[0099] In this embodiment, a method for preparing an Al-Ti-Nb-B refiner for casting aluminum-silicon alloys comprises the following steps:

[0100] a. Weighing of raw materials:

[0101] Using Nb 2 o 5 As Nb source, Al bulk as Al source, K 2 TiF 6 powder as Ti source, KBF 4 powder as the B source; according to the composition ratio of the preparation target Al-Ti-Nb-B refiner, the raw material batching is carried out, and the raw material batching adopts the following mass percentages for batching:

[0102] Weigh 394.46 grams of Al block, K 2 TiF 6 Powder 44.67g, KBF 4 Powder 31.06g, Nb 2 o 5 Powder 25.41 grams is used as raw material, and additionally takes 1% of Al mass as burning loss;

[0103] b. Melting of Al-Ti-Nb-B refiner:

[0104] b-1. Melting the raw material Al block weighed in the step a at 800° C. to obtain an aluminum melt;

[0105] b-2. Nb to be ...

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Abstract

The invention discloses a preparation method of an Al-Ti-Nb-B refiner for casting an aluminum-silicon alloy. The preparation method comprises the following steps that a, raw materials are weighted; and b, smelting of the Al-Ti-Nb-B refiner is carried out. According to the Al-Ti-Nb-B refiner prepared by the method, Nb2O5 is introduced as a Nb source, so that the raw material cost is greatly reduced; in the aspect of preparation effect, the grain size of alpha-Al in the aluminum-silicon alloy can be refined to 220 microns, and the industrial approval standard is met. Nb is introduced into the refiner through aluminothermic reaction, so that fine dispersion distribution of the second phases MB2 and MAl3 in the Al-Ti-Nb-B refiner is realized, and the refinement performance of the Al-Ti-Nb-B refiner is improved. The method can greatly reduce the preparation cost of the Al-Ti-Nb-B refiner, the preparation method is simple and convenient, and is suitable for industrial large-scale production.

Description

technical field [0001] The invention relates to a refining agent for casting aluminum-silicon alloy and its preparation method, in particular to a refining agent for Al-Ti-Nb-B casting aluminum-silicon alloy and its preparation method, 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 refiners, among which Al-5Ti-B is one of the most widely used refiners. However, this refiner is not suitable for refining Al-Si alloys with high silicon content (greater than 5wt.% Si), mainly because silicon e...

Claims

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Application Information

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IPC IPC(8): C22C1/02C22C1/06C22C21/00
CPCC22C1/026C22C1/06C22C21/00
Inventor 李谦黎阳路洪州罗群张馨云
Owner SHANGHAI UNIV
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