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Method for preparing in-situ generated aluminum-base composite based on electroslag remelting process

An aluminum-based composite material and electroslag remelting technology, which is applied in the field of in-situ endogenous aluminum-based composite material preparation based on electroslag remelting method, to achieve the effect of avoiding gas entrainment, increasing the contact area, and solving the difficulty of slag removal

Inactive Publication Date: 2010-09-15
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There is no report on how to adopt reasonable technological means to solve the above-mentioned problems caused by the traditional mixed salt method to prepare aluminum matrix composites.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Cast industrial pure aluminum into cylindrical consumable electrode rods according to requirements, with a diameter of 0.3 to 0.8 times the inner diameter of the crystallizer and a length of 1.5 to 2.5 times the height of the crystallizer; then put the aluminum alloy consumable electrode rods into the electroslag furnace Inside, add the basic slag:

[0018] 40%KCl+40%NaCl+10%CaF 2 +10%Na 3 AlF 6 , the weight ratio of the total amount of mixed salt added to the basic slag is 0.2; the slag and mixed salt are baked at 200°C for no less than 5 hours before adding to make them fully dry without moisture and crystal water.

[0019] Electroslag remelting is carried out under the conditions of remelting current of 500-600A and voltage of 65V. The pure aluminum consumable electrode rod is gradually melted. During the process of metal droplets passing through the molten slag pool, aluminum and potassium fluoroborate and fluorine Potassium titanate fully reacts, and TiB is obta...

Embodiment 2

[0021] The difference between this embodiment and embodiment 1 is that the basic slag used is:

[0022] 30%KCl+30%NaCl+30%MgCl 2 +10%Na 3 AlF 6 , the total amount of mixed salt added is the same as that of slag; the remelting current is 600-700A, and the voltage is 50V; the rest of the steps are the same as in Example 1. This example can obtain TiB 2 Aluminum matrix composite with a particle volume content of 6%.

Embodiment 3

[0024] The difference between this embodiment and embodiment 1 is that the basic slag used is:

[0025] 30%NaCl+30%MgCl 2 +15%MgF 2 +25%Na 3 AlF 6 , the total amount of mixed salt added is 1.5 times the total amount of slag; the remelting current is 500-600A, and the voltage is 65V; the rest of the steps are the same as in Example 1. This example can obtain TiB 2 Aluminum matrix composite with a particle volume content of 8%.

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Abstract

The invention discloses a method for preparing an in-situ generated aluminum matrix composite based on an electroslag remelting process, belonging to the technical field of a metal matrix composite. The method comprises the following steps: pouring pure aluminum and aluminum alloy into consumable electrode bars, placing in an electroslag furnace, mixing with a slag-making agent consisting of basic slagcharge, potassium fluotitanate and potassium fluoborate, remelting electroslag, and cooling to obtain the in-situ generated aluminum matrix composite after reaction. The method adopts the basic slagcharge, potassium fluotitanate and potassium fluoborate as the slag-making agent, and the melted pure aluminum and aluminum alloy are in full contact with mixed fluoride to react to generate TiB2 particles through a melted slag pool; and the generated liquid slag is totally separated from aluminum melt as the wettability of the TiB2 particles to aluminum liquid is better than that of the slag-making agent, and the good-quality aluminum matrix composite can be obtained by cooling after the whole reaction is finished.

Description

technical field [0001] The invention relates to a preparation method in the technical field of metal matrix composite materials, in particular to an in-situ endogenous aluminum matrix composite preparation method based on an electroslag remelting method. Background technique [0002] At present, in the technical field of preparing aluminum matrix composites, the mixed salt reaction method (LSM) is a typical method for preparing particle-reinforced aluminum matrix composites by in-situ autogenous reaction. The method is to generate TiB inside the matrix through in situ authigenic reaction by adding mixed salts to the aluminum melt. 2 Reinforced particles. The reinforced particle size of the prepared aluminum-based composite material is fine, and the distribution in the matrix is ​​relatively uniform. Compared with the matrix, the mechanical properties of the composite material are greatly improved, and the process is simple and the cost is low. [0003] The document retriev...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B9/18
Inventor 王俊李盼薛菁高海奇陈冲毕秋孙宝德疏达戴永兵李飞高海燕张佼
Owner SHANGHAI JIAO TONG UNIV
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