Unlock instant, AI-driven research and patent intelligence for your innovation.

Rare earth sintered magnet, method for manufacturing rare earth sintered magnet and rotary machine

A technology of sintered magnets and rare earths, which is applied in the manufacture of inductors/transformers/magnets, magnetic objects, circuits, etc., and can solve problems such as damage and cracking

Inactive Publication Date: 2014-03-05
TDK CORPARATION
View PDF4 Cites 22 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Such thinner and smaller products are more prone to breakage and cracking

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 sintered magnet, method for manufacturing rare earth sintered magnet and rotary machine
  • Rare earth sintered magnet, method for manufacturing rare earth sintered magnet and rotary machine
  • Rare earth sintered magnet, method for manufacturing rare earth sintered magnet and rotary machine

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～33、 comparative example 1～6、8～12

[0166] Next, rare earth sintered magnets were produced as shown in Table 3. These raw material alloys (alloy A to alloy F, alloy a to alloy e) were subjected to hydrogen adsorption treatment at room temperature, and dehydrogenation treatment was performed at 600°C for 1 hour in an Ar atmosphere to coarsely pulverize the main phase alloy (alloy A ~ alloy F) and grain boundary phase alloys (alloy a ~ alloy e). After coarse pulverization by hydrogen pulverization, about 0.1 wt% of oleic acid amide was added as a pulverization aid to the coarsely pulverized main phase alloys (alloy A to alloy F) and grain boundary phase alloys (alloy a to alloy e). agent, with high pressure N 2 Air jet mill pulverization, respectively made into fine powder with an average particle size of about 4.2 μm to 4.6 μm. In addition, the oxygen atmosphere is about 200 ppm after the hydrogen pulverization until the sintering treatment. Next, the fine powder of the main phase alloy (alloy A to alloy F), t...

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
particle sizeaaaaaaaaaa
Login to View More

Abstract

Provided are a rare earth sintered magnet having excellent corrosion resistance and improved temperature characteristics and strength, a method for manufacturing a rare earth sintered magnet, and a rotary machine. A rare earth sintered magnet includes at least a main phase (11) comprising an R2T14B chemical compound (where R is one or more rare earth element including as the principle component either or both of Nd and Pr, and T indicates one or more transition element including Fe or Fe and Co) and a grain boundary phase (15) containing more R than the main phase (11). The main phase (11) includes a heavy rare earth element (including at least either or both of Dy and Tb). The main phase grains of at least part of the main phase (11) contained in the rare earth sintered magnet include at least three regions, namely, a low concentration region (12), a high concentration region (13) and an intermediate concentration region (14). These three regions are present in the following order: low concentration region (12), high concentration region (13) and intermediate concentration region (14), from the low concentration region (12) going towards the grain boundary phase (15) in a main phase grain.

Description

technical field [0001] The present invention relates to a rare earth sintered magnet, a method for manufacturing the rare earth sintered magnet, and a rotating electric machine used in a rotating electric machine such as a motor, or a magnetic field generating device of a Magnetic Resonance Imaging system (MRI). Background technique [0002] As rare earth sintered magnets, there are known R-T-B (R represents one or more rare earth elements containing either or both of Nd and Pr as main components, and T represents a transition element containing Fe or Fe and Co. element, B means B or B and C) system composition of rare earth sintered magnets (R-T-B series rare earth sintered magnets). The R-T-B series rare earth sintered magnet has a composition including a main phase and a grain boundary phase, wherein the main phase is composed of R 2 T 14 Composed of B compounds, the grain boundary phase contains an R-rich phase that contains more R than the main phase. The R-T-B serie...

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 Applications(China)
IPC IPC(8): H01F1/057B22F1/00B22F3/10C22C33/02C22C38/00H01F1/08H01F41/02
CPCC22C38/005H01F1/086H01F41/0266H01F1/0577C22C38/14C22C38/06C22C38/002C22C2202/02C22C33/02C22C38/10C22C38/16B22F2998/10B22F1/09B22F3/02B22F3/10
Inventor 日高彻也佐藤和生坂元一也藤户津哉宝迫元彰村田素久三竹晃司
Owner TDK CORPARATION
Features
  • R&D
  • Intellectual Property
  • Life Sciences
  • Materials
  • Tech Scout
Why Patsnap Eureka
  • Unparalleled Data Quality
  • Higher Quality Content
  • 60% Fewer Hallucinations
Social media
Patsnap Eureka Blog
Learn More

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

© 2025 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com