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Method for preparing Al-B intermediate alloy with high boron content

A technology of master alloy and boron content, applied in the field of preparation of aluminum-based master alloy, can solve the problem of insufficient boron content and high

Active Publication Date: 2012-04-18
包头铝业有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to provide a semi-solid metal mold casting or continuous casting preparation method for Al-B master alloy with high boron content, to solve the problem that the boron content in the current Al-B master alloy is not high enough, and usually contains '

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  • Method for preparing Al-B intermediate alloy with high boron content
  • Method for preparing Al-B intermediate alloy with high boron content
  • Method for preparing Al-B intermediate alloy with high boron content

Examples

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Embodiment 1

[0017] Take 2 kg of pure aluminum, powdered KBF 4 2 kg (grain size 160 mesh-300 mesh), melted in an intermediate frequency induction furnace. The technology of the patent application (application number 200910012841.3, application date: 2009.7.31) was applied to obtain an Al-B alloy melt with a boron content of ~8wt%. Heat the obtained Al-B alloy melt with high boron content to about 1300°C, stir at 200 rpm for 1 minute, and keep it warm for 10 minutes to dissolve the boron-aluminum compound, eliminate the wall-climbing phenomenon, and wrap the boron-aluminum compound The molten salt (slag) exposed to the melt can be removed to obtain a high-quality aluminum-boron master alloy melt; turn off the heating power supply to cool the aluminum-boron master alloy melt to 850°C with the furnace; pour out the floating salt on the upper part of the melt, Stir the melt for 2 minutes at a speed of 200 rpm, pour it into an iron mold with a diameter of Φ80mm, and solidify it into an aluminu...

Embodiment 2

[0020] The method for obtaining the Al-B alloy melt with high boron content is the same as that in Example 1. Heat the obtained Al-B alloy melt with high boron content to about 1280°C, stir at 400 rpm for 1 minute, and keep it warm for 8 minutes to dissolve the boron-aluminum compound, eliminate the wall-climbing phenomenon, and wrap the boron-aluminum compound The molten salt (slag) exposed to the melt can be removed; the high-quality aluminum-boron intermediate alloy melt is cooled to 900°C with the furnace, the floating salt on the upper part of the melt is poured out, and the melt is stirred for 2 minutes at a speed of 400 rpm Finally, it is poured into an iron mold with a diameter of Φ80mm and solidified into an aluminum-boron master alloy.

[0021] Metallographic analysis shows that boron is AlB 12 The form of the particles is dispersed in the aluminum matrix, see figure 2 . Chemical analysis indicated that the boron content in the master alloy was -8 wt%.

Embodiment 3

[0023] The method for obtaining the Al-B alloy melt with high boron content is the same as that in Example 1. Heat the obtained Al-B alloy melt with high boron content to about 1310°C, stir at 600 rpm for 2 minutes, and keep it warm for 12 minutes to dissolve the boron-aluminum compound, eliminate the wall-climbing phenomenon, and make the boron-aluminum compound wrapped The molten salt (slag) is exposed to the melt and can be removed; the high-quality aluminum-boron master alloy melt is cooled to 810°C with the furnace, the floating salt on the upper part of the melt is poured out, and the melt is stirred at a speed of 600 rpm for 2 minutes. , poured into an iron mold with a diameter of Φ80mm, and solidified into an aluminum-boron master alloy.

[0024] Metallographic analysis shows that boron is AlB 12 The form of the particles is dispersed in the aluminum matrix, see image 3 . Chemical analysis indicated that the boron content in the master alloy was -8 wt%.

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Abstract

The invention belongs to preparation technology for aluminium-based intermediate alloy, in particular to a method for preparing Al-B intermediate alloy with high boron content (about 8 weight percent) through semi-solid metal mold casting or continuous casting. The method comprises the following steps of: heating the Al-B intermediate alloy with high boron content to 1,300 + / -25 DEG C, stirring for 1 to 2 minutes, keeping the temperature for 8 to 15 minutes, and removing molten salt (slag) coated by a B-Al compound to obtain the high-quality Al-B intermediate alloy melt; cooling the alloy melt to the temperature of 850+ / -50 DEG C, pouring out the molten salt on the surface layer, and stirring the melt; and casting the melt into a metal mold or performing continuous solidification to realize rapid or near-rapid solidification to prepare the Al-B intermediate alloy. The Al-B intermediate alloy prepared by the method has the boron content about 8 weight percent; and the boron is distributed in an aluminium matrix in a form of a granular AlB12 compound.

Description

technical field [0001] The invention belongs to the preparation technology of an aluminum-based master alloy, in particular to a semi-solid metal mold casting or continuous casting preparation method of an aluminum-boron master alloy with a high boron content (~8wt% B). Background technique [0002] In order to reduce or eliminate the influence of transition group trace elements on the conductivity of pure aluminum and aluminum alloys, a certain amount of Al-B intermediate alloy is usually added to the melt when smelting pure aluminum and aluminum alloys for electrical purposes, so that the transition group elements form boron Compounds are removed by precipitation. From the perspective of ensuring the quality of conductive aluminum, it is desirable to use Al-B master alloys with as high a boron content as possible in industrial production, and boron is required to be dispersed in the aluminum matrix in the form of boron-aluminum compound particles. At present, the Al-B mas...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/10C22C1/02C22C21/00B22D11/00B22D27/20
Inventor 赵九洲王云利赵洪生王青亮栗争光兴成尧沈利
Owner 包头铝业有限公司