Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

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
View PDF0 Cites 8 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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 field in the sintering process is relatively poor during the intense pulse current sintering process. The poor problem, and improve the extremely demanding heat resistance performance of the magnetic field system when coupling the alternating magnetic field in the strong pulse current sintering process

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for preparing nanocrystalline block iron-base alloy material by four-field coupling sintering

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Step 1: Mix the powder

[0022] The iron, copper, nickel, molybdenum and graphite elemental powders are proportioned according to the following mass percentages: iron 94.2%, copper 2%, nickel 2%, molybdenum 1%, graphite 0.8%, containing unavoidable trace impurities. Among them, the iron powder used is water atomized iron powder with an average particle diameter of about 150 μm and a purity of ≥99.0%; the average particle diameter of copper powder is about 75 μm and a purity of ≥99.8%; the average particle diameter of nickel powder is about 3-5 μm and its purity is ≥ 99.5%; the average particle diameter of molybdenum powder is about 75 μm, and the purity is ≥99.5%; the average particle diameter of graphite powder is about 2-3 μm, and the purity is ≥99.5%. The powder after proportioning was 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 o...

Embodiment 2

[0029] Step 1: Mix the powder

[0030] The iron, copper, nickel, molybdenum and graphite elemental powders are proportioned according to the following mass percentages: iron 94.2%, copper 2%, nickel 2%, molybdenum 1%, graphite 0.8%, containing unavoidable trace impurities. Among them, the iron powder used is water atomized iron powder with an average particle diameter of about 150 μm and a purity of ≥99.0%; the average particle diameter of copper powder is about 75 μm and a purity of ≥99.8%; the average particle diameter of nickel powder is about 3-5 μm and its purity is ≥ 99.5%; the average particle diameter of molybdenum powder is about 75 μm, and the purity is ≥99.5%; the average particle diameter of graphite powder is about 2-3 μm, and the purity is ≥99.5%. The powder after proportioning was 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 o...

Embodiment 3

[0036] Step 1: Mix the powder

[0037]The iron, copper, nickel, molybdenum and graphite elemental powders are proportioned according to the following mass percentages: iron 94.2%, copper 2%, nickel 2%, molybdenum 1%, graphite 0.8%, containing unavoidable trace impurities. Among them, the iron powder used is water atomized iron powder with an average particle diameter of about 150 μm and a purity of ≥99.0%; the average particle diameter of copper powder is about 75 μm and a purity of ≥99.8%; the average particle diameter of nickel powder is about 3-5 μm and its purity is ≥ 99.5%; the average particle diameter of molybdenum powder is about 75 μm, and the purity is ≥99.5%; the average particle diameter of graphite powder is about 2-3 μm, and the purity is ≥99.5%. The powder after proportioning was 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 of...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
Average grain sizeaaaaaaaaaa
Densityaaaaaaaaaa
Transverse breaking strengthaaaaaaaaaa
Login to View More

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
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
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com