Method for preparing nanocrystalline block iron-base alloy material by four-field coupling sintering

An iron-based alloy and nanocrystalline technology, which is applied in the field of plastic forming technology and powder metallurgy, can solve the problems of demanding heat resistance of the magnetic field system and poor uniformity of the sintering radial temperature field, so as to achieve good promotion and application prospects and improve comprehensive mechanics The effect of reducing the requirements of performance and equipment

Inactive Publication Date: 2008-12-17
SOUTH CHINA UNIV OF TECH
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0004] The purpose of the present invention is to overcome the shortcomings of the above-mentioned prior art, and provide a method for preparing nanocrystalline bulk iron-based alloy materials by four-field coupling sintering, so as to solve the problem that the uniformity of the radial temperature fi

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  • Method for preparing nanocrystalline block iron-base alloy material by four-field coupling sintering

Examples

Experimental program
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Example Embodiment

[0020] Example 1

[0021] Step 1: Mix powder

[0022] The iron, copper, nickel, molybdenum and graphite elementary powders are proportioned according to the following mass percentages: iron 94.2%, copper 2%, nickel 2%, molybdenum 1%, graphite 0.8%, and contain inevitable trace impurities. Among them, the iron powder used is water atomized iron powder, the average particle diameter is about 150μm, and the purity is ≥99.0%; the average particle diameter of copper powder is about 75μm, and the purity is ≥99.8%; the average particle diameter of nickel powder is about 3~5μm, and the purity is ≥ 99.5%; the average particle diameter of molybdenum powder is about 75μm, and the purity is ≥99.5%; the average particle diameter of graphite powder is about 2~3μm, and the purity is ≥99.5%. The proportioned powder is mixed in a V-type powder mixer for 5 hours.

[0023] Step 2: High-energy ball milling

[0024] The ball milling process is completed in the QM-2SP planetary ball mill. The material ...

Example Embodiment

[0028] Example 2

[0029] Step 1: Mix powder

[0030] The iron, copper, nickel, molybdenum and graphite elementary powders are proportioned according to the following mass percentages: iron 94.2%, copper 2%, nickel 2%, molybdenum 1%, graphite 0.8%, and contain inevitable trace impurities. Among them, the iron powder used is water atomized iron powder, the average particle diameter is about 150μm, and the purity is ≥99.0%; the average particle diameter of copper powder is about 75μm, and the purity is ≥99.8%; the average particle diameter of nickel powder is about 3~5μm, and the purity is ≥ 99.5%; the average particle diameter of molybdenum powder is about 75μm, and the purity is ≥99.5%; the average particle diameter of graphite powder is about 2~3μm, and the purity is ≥99.5%. The proportioned powder is mixed in a V-type powder mixer for 6 hours.

[0031] Step 2: High-energy ball milling

[0032] The ball milling process is completed in the QM-2SP planetary ball mill. The material ...

Example Embodiment

[0035] Example 3

[0036] Step 1: Mix powder

[0037]The iron, copper, nickel, molybdenum and graphite elementary powders are proportioned according to the following mass percentages: iron 94.2%, copper 2%, nickel 2%, molybdenum 1%, graphite 0.8%, and contain inevitable trace impurities. Among them, the iron powder used is water atomized iron powder, the average particle diameter is about 150μm, and the purity is ≥99.0%; the average particle diameter of copper powder is about 75μm, and the purity is ≥99.8%; the average particle diameter of nickel powder is about 3~5μm, and the purity is ≥ 99.5%; the average particle diameter of molybdenum powder is about 75μm, and the purity is ≥99.5%; the average particle diameter of graphite powder is about 2~3μm, and the purity is ≥99.5%. The proportioned powder is mixed in a V-type powder mixer for 6 hours.

[0038] Step 2: High-energy ball milling

[0039] The ball milling process is completed in the QM-2SP planetary ball mill. The material o...

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Abstract

The invention provides a method for preparing a bulk nano iron matrix composite by four-field coupling sintering. The four-field coupling adopted by the method refers to simultaneously applying rectangular pulse current and axial semi-wave pulse magnetic field and sintering pressure, wherein, the sintering pressure of positive and negative electrodes applied to power is 10MPa to 50MPa and time for sintering is 1 to 6 minutes. The peak value, base value, frequency, duty ratio of the rectangular pulse current and the strength of the additional axial semi-wave pulse magnetic field increase with the increasing of the size of sintering material. The method significantly improves the uniformity of the axial temperature field of sintering, promotes the comprehensive mechanical performance of iron matrix alloy in sintering state and prepares the bulk iron matrix composite that is characterized by being nearly completely compact, high strength and nanocrystal. The method obviously reduces the requirements for equipment, shortens period, improves efficiency, is especially beneficial to the domestic production of the bulk nano iron matrix composite and has good prospect of promotion and application.

Description

technical field [0001] The invention relates to plastic forming technology and powder metallurgy technology, in particular to a method for preparing nanocrystalline bulk iron-based alloy material by four-field coupling sintering. Background technique [0002] The manufacturing level of iron-based alloy structural materials is one of the important indicators to measure a country's industrial development level. High density, uniform and fine structure and high performance are the main trends in the development of steel-based powder metallurgy materials and parts that are widely used in industry. [0003] Since the 1990s, a new type of current sintering technology represented by electric field activation sintering has appeared. This technology uses the Joule heating effect and other electric field effects generated by strong pulse current to make the powder reach or approach the full Dense, with a short sintering time, usually only a few minutes, and without pre-pressing and a...

Claims

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Application Information

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IPC IPC(8): C22C1/04B22F3/12
Inventor 李小强梁华星李元元邵明屈盛官王郡文
Owner SOUTH CHINA UNIV OF TECH
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