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

Rare earth multiphase alloy material and its preparation

A technology of alloy material and preparation process, which is applied in the field of preparation of rare earth multi-phase alloy materials, to achieve the effects of ensuring quality, eliminating high-temperature crystallization treatment, and reducing the amount of rare earth

Inactive Publication Date: 2008-12-03
TAIYUAN UNIV OF TECH +1
View PDF3 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the above-mentioned problems of high-temperature heat treatment, by adjusting the type of alloy elements and the solidification cooling rate, the high-temperature crystallization treatment is changed to low-temperature homogenization treatment, so that the alloy material can obtain stable and excellent magnetic properties

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
  • Rare earth multiphase alloy material and its preparation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0007] Embodiment 1: Melt in a vacuum induction melting furnace into an intermediate alloy ingot divided into Nd4at%, Fe78at%, Co2at%, B14at%, Ga0.5at%, namely Nd4Fe78Co2B14Ga0.5, the alloy ingredient is: Nd4.3at %, Fe79at%, Co2.1at%, B14.1at%, Ga0.5at%, melted into iron-based coarse-grained alloy in a vacuum induction furnace, the average diameter of the crystal grains is 10μm-100μm; then the crushed ingot The block is placed in a copper crucible in a vacuum. Under the action of an electric arc, the ingot is melted again, and the molten alloy is poured on the edge of the high-speed rotating wheel when the crucible is tilted. The linear velocity is 15ms -1 The molybdenum alloy wheel quickly solidifies to form a sheet with a thickness of 300μm-600μm, and then the alloy sheet is placed in a heat treatment furnace at 350°C to obtain the raw material for powdering. The main phase of the alloy material is R 2 F 14 B, the auxiliary phase contains α-Fe, and the average diameter of the cr...

Embodiment approach 2

[0008] Embodiment 2: Use a vacuum induction furnace to melt into an intermediate alloy ingot divided into Nd4at%, Pr4at%, Fe82at%, Co3at%, B6at%, and Ga1at%, namely Nd4Pr4Fe82Co3B6Ga1. The alloy ingredients are: Nd4.at%, Pr4 .3at%, Fe83at%, Co3.1at%, B6.2at%, Ga1.1at%, and then process the master alloy into powder raw materials. The method used is basically the same as that of Embodiment 1, except that the linear velocity at the edge of the molybdenum wheel is 25ms -1 , The thickness of the alloy flakes is 50μm-100μm. The alloy flakes are placed in a heat treatment furnace for heat preservation at 390°C to obtain raw materials for powdering. The main phase of the alloy is R 2 F 14 B, the auxiliary phase contains α-Fe, and the average diameter of the crystal grains is 50nm-100nm. The properties of the raw materials are shown in Table 1.

Embodiment approach 3

[0009] Embodiment 3: Use a vacuum induction furnace to melt into an intermediate alloy ingot divided into Nd9at%, Fe86at%, Co1at%, B5at%, Ga0.1at%, that is, Nd9Fe86Co1B5Ga0.1, the alloy ingredients are: Nd9.3at%, Fe87at%, Co1.2at%, B5.2at%, Ga0.15at%, and then the master alloy is processed into the raw material for powdering. The method used is basically the same as that of Embodiment 1, except that the linear velocity of the molybdenum wheel edge is 20ms -1 , The thickness of the alloy flakes is 100μm-300μm. The alloy flakes are kept in a heat treatment furnace at 370℃ to obtain the raw material for powder making. The main phase of the alloy material is R 2 F 14 B, the auxiliary phase contains α-Fe, and the average diameter of the crystal grains is 100nm-500nm. The properties of the raw materials are shown in Table 1.

[0010] Table 1 Properties of raw materials

[0011]

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
diameteraaaaaaaaaa
diameteraaaaaaaaaa
thicknessaaaaaaaaaa
Login to View More

Abstract

Main phase of the rare earth complex phase alloy material is R2F14B and subsidiary phase is alpha-Fe. The average diameter of crystal grains is 50nm-1 micron m. The components of alloy R include Nd, Pr, Fe, B, Co and Ca etc. Sub-crystallite alloy lamellate material is prepared by using the method for quick cooling the melt mass. Based on requirements, homogenizing treatment in low temperature is carried out for the lamellate material to obtain the alloy material needed for preparing permanent magnet powder.

Description

Technical field [0001] The invention relates to a preparation process of a rare earth composite alloy material. Background technique [0002] American GM company rapid quenching ribbon is obtained by rapid quenching of vacuum-melted NdFeB alloy at a certain speed. The thin strip obtained under the optimal rapid quenching speed is composed of very pure randomly oriented Nd 2 Fe 14 B crystal grain composition, the average diameter is 30mm, it is Nd with an average width of 2mm 0.7 Fe 0.3 Surrounded by the eutectic phase, this thin ribbon has good magnetic properties, but in fact the process window for the best quenching result is very narrow. Therefore, the amorphous alloy ribbon is generally obtained under the condition of excessively fast quenching speed, and then subjected to heat treatment, that is, crystallization treatment. However, this high-temperature heat treatment often causes unevenness in the microstructure. Patent CN1347124A proposes that the temperature for crystalli...

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
Patent Type & Authority Patents(China)
IPC IPC(8): H01F1/057C22C38/00
Inventor 赵浩峰卫爱丽乔永刚宋伟王天明蔚晓嘉
Owner TAIYUAN 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