Al-Ti-B refining agent and preparing method thereof

A technology of al-ti-b and refiner, which is applied in the field of low-cost refiner preparation, can solve the problems of low preparation efficiency, high preparation cost, and low refinement efficiency, and achieve improved refinement efficiency and uniform distribution , low-cost effect

Inactive Publication Date: 2019-05-31
大连科天新材料有限公司
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The structure of Al-Ti-B master alloy prepared by fluoride salt reaction method contains TiAl 3 phase, TiB in tissue 2 Most of the particles exist in the form of agglomerates, and the particles in the agglomerates stick together, the refinement efficiency is low, and serious pollution problems occur at the same time
In order to prepare an efficient Al-Ti-B refiner, various methods have been tried at home and abroad, such as oxide method, self-propagating high-temperature synthesis method, etc., but there are mainly disadvantages such as low preparation efficiency and high preparation cost.

Method used

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  • Al-Ti-B refining agent and preparing method thereof

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Embodiment 1

[0018] The process of preparing Al-5Ti-1B refiner by melt self-propagating synthesis reaction method is as follows:

[0019] 1. Raw material preparation, refiner by H 3 BO 3 、TiO 2 , aluminum powder, aluminum ingot, C 2 Cl 6 It is prepared with cryolite covering agent, in which the purity of aluminum ingot is 99.9%.

[0020] 2. Prepare 1Kg of refiner, weigh H as required 3 BO 3 、TiO 2 , aluminum powder, aluminum ingots, the aluminum burning loss rate is 3%. Requires Al-TiB 2 The molar ratio of refiner ingredients is: Ti / B=1:2, Ti / TiO 2 =2:3.

[0021] 3. Put H 3 BO 3 、TiO 2 The powder is heated at 300°C for two hours to remove the moisture.

[0022] 4. Mix titanium powder, aluminum powder and boron powder evenly, put the evenly mixed powder in the mold, and press it into 70×Φ80mm 3 cylindrical powder block.

[0023] 5. Apply a layer of paint to tools such as the mold and slag scraper to prevent Fe impurity elements from contaminating the refiner. A graphite cru...

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Abstract

The invention discloses an Al-Ti-B refining agent and a preparing method thereof, and belongs to the technical field of refining agents. The Al-Ti-B refining agent comprises components including, by mass percent, 8.0%-12.0% of Ti, 3.0%-5.0% of B and the balance Al. The Ti/B molar ratio is equal to 1/2. Phase compositions include alpha-Al and TiB2. According to the requirements, H3BO3, TiO2, aluminum powder and an aluminum ingot are weighed; according to the molar ratio of components of the refining agent, Ti/B=1/4, and Ti/TiO2=2/3; the purity of the aluminum ingot is 99.9%; TiO2 and H3BO3 areevenly mixed, and heating is conducted at 300 DEG C for 2 h; the heated powder and the heated aluminum powder are mixed to be arranged in a die and are pressed into blocks; the aluminum ingot is heated and melted and is covered with cryolite; and melt is subjected to temperature rise and pressed into the blocks, stirring is conducted for reaction, pressing of C2Cl6 is conducted for refining, and slagging-off and casting are conducted. The size of TiB2 prepared through low-cost raw materials is smaller than 1 micron.

Description

technical field [0001] The invention belongs to the technical field of refiners, in particular to a method for preparing a low-cost refiner. Background technique [0002] At present, the refining agent widely used in the aluminum industry is Al-Ti-B intermediate alloy wire rod. Due to the backward production conditions and technical level, there is still a certain gap between the product and imported products, mainly reflected in the low B content and poor purity. The size, shape and distribution of the two phases are not up to standard. At the same time, most Al-Ti-B refiners contain TiAl 3 phase, which may contaminate some elements in some alloys. At present, a large number of Al-Ti-B master alloys are prepared industrially through the fluoride salt reaction method. The typical production process is: adding K to the aluminum melt at 750-850°C 2 TiF 6 and KBF 4 , through mechanical stirring to make it fully react to prepare Al-Ti-B refiner. The structure of Al-Ti-B ma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/06C22C21/00C22C1/02
Inventor 陈子勇何梦珂王汉光
Owner 大连科天新材料有限公司
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