Preparation method of pre-alloy powder of ferrum-aluminum intermetallic compound Fe2Al5

A pre-alloyed powder, fe2al5 technology, applied in the field of powder metallurgy, can solve the problems of reducing the mechanical properties of materials, coarse particle size, etc., and achieve the effect of easy grinding and crushing, high brittleness, uniform composition and mechanical properties

Active Publication Date: 2013-02-13
ZHUZHOU HARD ALLOY GRP CO LTD
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Problems solved by technology

[0003] Chinese patent "Method for making iron-aluminum intermetallic compound homogeneous porous material using powdered raw materials" (publication number 101838752A, publication date September 22, 2010) published A method for making iron-aluminum intermetallic compound homogeneous porous materials by using powdered raw materials is proposed. The mixed powder of iron powder and aluminum powder is heated to 400~950°C under vacuum, crushed and milled after natural cooling, the disadvantage is that the pre-alloyed powder is Fe2Al5, FeAl2, FeAl3
The required intermetallic compound pre-alloy powder is generally smelted to synthesize the intermetallic compound, and then atomized into a pre-alloy powder by inert gas or vacuum atomization. However, the particle size of the intermetallic compound pre-alloy powder prepared by this method is coarse. During the preparation of composite materials, it is easy to form a "metal pool" in the material, which reduces the mechanical properties of the material

Method used

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  • Preparation method of pre-alloy powder of ferrum-aluminum intermetallic compound Fe2Al5

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Set the granularity to 60μm Carbonyl iron powder and particle size 100μm Analytical pure aluminum powder by Fe 2 al 5 The mass percentage ingredients are mixed by ball milling and passed through a 100-mesh sieve to obtain a uniform mixed powder; the above-mentioned mixed powder is placed in a cast iron container and spread to a thickness of 10mm. Raise the temperature from room temperature to 450°C, then heat up to 640°C at a rate of 2°C / min, hold the temperature for 4 hours for sintering, and then cool naturally to obtain Fe 2 al 5 Intermetallic pre-alloying; the Fe 2 al 5 Intermetallic pre-alloy grinding, passing through a 325 mesh sieve to obtain a particle size of ≤ 40μm Iron-aluminum intermetallic compound Fe 2 al 5 The pre-alloyed powder, its typical metallographic photo see figure 1 (The following examples are the same). Depend on figure 1 It can be seen that the iron-aluminum intermetallic compound Fe obtained by the inventive method 2 al 5 The...

Embodiment 2

[0021] Set the granularity to 10μm Iron powder and particle size 50μm Aluminum powder according to Fe 2 al 5 The mass percentage ingredients are mixed by ball milling and passed through a 200-mesh sieve to obtain a mixed powder; the above-mentioned mixed powder is placed in a cast iron container and spread to a thickness of 6mm, and under the protection of hydrogen, the temperature is raised from room temperature to 400 ℃, then heated to 550℃ at a rate of 0.5℃ / min, held for 8 hours for sintering, and then cooled naturally to obtain Fe 2 al 5 Intermetallic pre-alloying; the Fe 2 al 5 Intermetallic pre-alloy grinding, passing through a 500-mesh sieve to obtain a particle size of ≤ 25μm Iron-aluminum intermetallic compound Fe 2 al 5 pre-alloyed powder.

Embodiment 3

[0023] Set the granularity to 30μm Iron powder and particle size 80μm Analysis of pure aluminum powder by Fe 2 al 5 The mass percentage ingredients are mixed by ball milling and passed through a 100-mesh sieve to obtain a mixed powder; the above-mentioned mixed powder is placed in a cast iron container and spread to a thickness of 8mm. Under the protection of argon, the temperature is raised from room temperature to 430°C, then heated to 600°C at a rate of 1°C / min, held for 6 hours for sintering, and then cooled naturally to obtain Fe 2 al 5 Intermetallic pre-alloying; the Fe 2 al 5 Intermetallic pre-alloy grinding, 425 mesh sieve, particle size ≤ 33 μm Iron-aluminum intermetallic compound Fe 2 al 5 pre-alloyed powder.

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Abstract

The invention discloses a preparation method of pre-alloy powder of a ferrum-aluminum intermetallic compound Fe2Al5 with uniform components and fine granularity, which successively comprises the following steps: proportioning ferrum powder and aluminum powder according to the weight percent of Fe2Al5 and obtaining the uniform mixing powder through ball-milling, mixing and sieving; placing the mixing powder into a container to be flattened; heating the mixing powder to the reaction temperature of the main solid phase of ferrum-aluminum to be sintered at the vacuum or non-oxidative atmosphere; naturally cooling when maintaining the temperature for 4 to 8 hours; and grinding and sieving the obtained Fe2Al5 intermetallic pre-alloy to obtain the pre-alloy powder of the ferrum-aluminum intermetallic compound Fe2Al5. The preparation method of the invention has the advantages of simple technology, high efficiency and low cost.

Description

technical field [0001] The method belongs to the field of powder metallurgy and relates to a method for preparing prealloyed powder of iron-aluminum intermetallic compound. Background technique [0002] The long-range ordered arrangement of intermetallic compound atoms and the coexistence of interatomic metal bonds and covalent bonds make its service temperature and certain mechanical properties between Ni-based superalloys and high-temperature ceramic materials, and it is resistant to high-temperature oxidation and corrosion. And other aspects also have unique excellence, such as FeAl, Fe 3 Al intermetallic compounds have strong corrosion resistance and weak ferromagnetism, and are suitable for harsh working environments. At present, the application direction of Fe-Al intermetallic compounds is mainly as structural parts resistant to sulfur-containing atmospheres and oxidizing atmospheres. Fe 3 Al alloy not only has good heat resistance, wear resistance and corrosion res...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C21/00C22C38/06C22C1/04B22F9/04
Inventor 龙坚战魏修宇陆必志方晴余怀民李勇卢少武管玉明蒋洪亮
Owner ZHUZHOU HARD ALLOY GRP CO LTD
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