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Technique for preparing aluminum-iron alloy from thermal injection iron particles

A technology of aluminum-iron alloy and process method, which is applied in the field of aluminum-iron alloy and aluminum-iron alloy casting by thermal spraying iron particles, which can solve the problems of increasing iron element, polluting alloy, small sample size, etc., and achieves the refinement of aluminum-iron phase and alloy The effect of high purity and simple process

Inactive Publication Date: 2014-04-30
XIHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Modification treatment can change the morphology and distribution of the coarse aluminum-iron phase in the aluminum-iron alloy. Commonly added elements include Ca, Co, Mg, Mn, Be, etc. This chemical addition process can refine the aluminum-iron phase. However, the added alloying elements will pollute the alloy, and will not have a refining effect on alloys with higher iron content
Rapid solidification and mechanical alloying technology can significantly expand the solid solution limit of alloying elements, so that all inclusions and precipitates are solid-solved or dispersed in fine particles. At the same time, they can also strongly inhibit composition segregation and obtain highly refined structures. Higher; and rapid solidification technology requires extremely high melting temperature, resulting in expensive melting equipment and furnace body, in addition, high temperature melting will cause a large alloy burning loss
The strong plastic deformation method can significantly refine the structure and aluminum-iron phase, and increase the solid solubility of iron elements in the aluminum matrix, but the strong plastic processing procedure is complicated, and the obtained sample size is small, and it is only suitable for low iron content. Aluminum iron alloy
The solid-liquid mixed casting method can effectively prevent the formation of needle-like or flake-like components, and obtain aluminum-iron alloys with high iron content and fine structure. There are many impurities such as oxides, and it is not easy to form an excellent aluminum-iron phase

Method used

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  • Technique for preparing aluminum-iron alloy from thermal injection iron particles
  • Technique for preparing aluminum-iron alloy from thermal injection iron particles

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Example 1: Preparation of an aluminum-iron alloy with an iron content of 5 wt%

[0017] First, pure aluminum melt is melted, the temperature is controlled at 100°C higher than the melting point of aluminum, and the iron particles with a purity of 99.90% and a particle size of 3-6 μm are dried at 130°C for 0.5h; then plasma spraying is used The equipment sprays dry iron particles into the melted aluminum melt under the protection of argon, where the plasma arc current is 450A, the plasma arc voltage is 85V, the argon pressure is 3MPa, and the argon flow rate is 0.8L / s. During the injection process of iron particles, the melt is mechanically stirred to homogenize the melt. After the injection of iron particles is completed, the melt is kept warm for 0.15h, and then naturally cooled to room temperature. Finally, an aluminum-iron alloy with an iron content of 5 wt% was obtained, and its SEM image is as follows figure 1 shown. The tensile test is carried out on a microcom...

Embodiment 2

[0018] Example 2: Preparation of an aluminum-iron alloy with an iron content of 15 wt%

[0019] First, pure aluminum melt is melted, and the temperature is controlled at 150°C above the liquidus line; then, dry iron particles with a purity of 99.99% and a particle size of 8-15 μm are sprayed into the In the alloy melt, the plasma arc current is 600A, the plasma arc voltage is 75V, the argon pressure is 2MPa, and the argon flow rate is 0.3L / s; the iron particles are dried at 80°C for 2.5h before injection. During the injection process of iron particles, the melt is uniformly stirred by electromagnetic stirring. After the injection of iron particles is completed, the melt is kept warm for 1.5h, and then cooled naturally to room temperature. Finally, an aluminum-iron alloy with an iron content of 15 wt% was obtained, and its SEM image is as follows figure 2 shown. The tensile test is carried out on a microcomputer-controlled electro-hydraulic servo universal testing machine, ...

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Abstract

The invention relates to a technique for preparing aluminum-iron alloy from thermal injection iron particles, which is characterized by comprising the steps of melting pure aluminum or aluminum alloy melt, and controlling melt temperature to be 100-150 DEG C above liquidus temperature; injecting iron particles which are 1-50 microns in particle size into the melted aluminum or aluminum alloy melt through plasma spraying equipment under protection of argon or other inert gas and stirring the melt, wherein the content of iron in the entire melt is 0.1-40.0wt%; and after injecting the iron particles, preserving heat of the melt for a duration, and naturally cooling to normal temperature. The prepared aluminum-iron alloy disclosed by the invention is uniform in component, and the second phase therebetween is in the form of small particle or approximate ball; the technique, which is free from any modification treatment, is simple in process, energy-saving and environmental friendly, low in cost, and continuous to operate. The technique disclosed by the invention is suitable for preparing aluminum alloy containing such high melting point elements as chromium, nickel and copper.

Description

technical field [0001] The invention relates to a process method for preparing aluminum-iron alloys by hot-spraying iron particles, which belongs to the technical field of metal material preparation, in particular to aluminum-iron alloy casting. Background technique [0002] Aluminum-iron casting alloy not only has low density, high specific strength (higher than high-quality steel), good plasticity (easy to process into various profiles), excellent thermal conductivity, but also has high hardness, good heat resistance and Excellent anti-sulfidation corrosion characteristics, coupled with the abundant and low price of aluminum iron ore raw materials, make it a very competitive high-temperature structural material in the aerospace industry; it can be used to manufacture high-temperature components that conventional aluminum alloys cannot serve, such as rockets and missile shells and tail fins, as well as heat-resistant parts such as aircraft hubs, skins, low-temperature blade...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C21/00C22C1/02
Inventor 魏晓伟王剑黄雄
Owner XIHUA UNIV