R-(Fe, Co)-B sintered magnet and making method

一种烧结磁体、磁体的技术，应用在电感/变压器/磁铁制造、磁性物体、磁性材料等方向，能够解决很大波动、价格不稳定等问题

Active Publication Date: 2017-05-24
SHIN ETSU CHEM CO LTD
View PDF27 Cites 15 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These factors indicate a risk of unstable or highly volatile prices

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
  • R-(Fe, Co)-B sintered magnet and making method
  • R-(Fe, Co)-B sintered magnet and making method
  • R-(Fe, Co)-B sintered magnet and making method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-4 and comparative example 1-3

[0072] By strip casting techniques, specifically by using R metal (R is a mixture of Nd and Pr or Nd and Pr), electrolytic iron, Co, other metals and ferroboron, weighing them to meet the required composition, in Ar The alloy was melted in a high frequency induction furnace in an atmosphere and the melt was cast to prepare a 0.2-0.3 mm thick strip form. The alloy is subjected to hydrogen fragmentation, that is, hydrogen absorption at normal temperature, and then heated at 600°C in vacuum for hydrogen desorption. To the obtained alloy powder, 0.07% by weight of stearic acid as a lubricant was added and mixed. The coarse powder was finely ground to a fine powder with an average particle size of about 3 μm on a jet mill using a nitrogen stream. Under an inert gas atmosphere, the powder is loaded into the mold of the molding machine. When a magnetic field of 15 kOe was applied for orientation, the powder was compression molded in a direction perpendicular to the magnetic field. ...

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 diameteraaaaaaaaaa
grain sizeaaaaaaaaaa
particle diameteraaaaaaaaaa
Login to view more

Abstract

The invention relates to a R-(Fe, Co)-B sintered magnet and a making method. An R-(Fe,Co)-B base sintered magnet consisting essentially of 12-17 at% of R containing Nd and Pr, 0.1-3 at% of M1 (typically Si), 0.05-0.5 at% of M2 (typically Ti), B, and the balance of Fe, and containing R2(Fe,Co)14B as a main phase has a coercivity of at least 10 kOe. The magnet contains a M2 boride phase at a grain boundary triple junction, and has a core / shell structure that the main phase is covered with a grain boundary phase. The grain boundary phase is composed of an amorphous and / or nanocrystalline R'-(Fe,Co)-M1' phase consisting essentially of 25-35 at% of R' containing Pr, 2-8 at% of M1' (typically Si), up to 8 at% of Co, and the balance of Fe. A coverage of the main phase with the R'-(Fe,Co)-M1' phase is at least 50%, and the bi-granular grain boundary phase has a width of at least 50 nm.

Description

[0001] Cross References to Related Applications [0002] This non-provisional application claims priority under 35 U.S.C. §119(a) to Patent Application No. 2015-225300 filed in Japan on November 18, 2015, the entire contents of which are incorporated herein by reference. technical field [0003] The invention relates to an R-(Fe, Co)-B based sintered magnet with high coercive force at high temperature and a preparation method thereof. Background technique [0004] Although Nd—Fe—B sintered magnets, hereinafter referred to as Nd magnets, are considered to be functional materials necessary for energy saving and performance improvement, their application range and production volume are expanding every year. Since many applications encounter thermal environments, the incorporated Nd magnets must have heat resistance as well as high remanence. On the other hand, since the coercive force of Nd magnets tends to decrease significantly at elevated temperatures, the coercive force at...

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): H01F1/057H01F41/02
CPCH01F1/0577H01F41/0253C22C38/001C22C38/002C22C38/005C22C38/008C22C38/02C22C38/06C22C38/10C22C38/14C22C38/16H01F41/0266H01F1/14741B22F3/16B22F3/24B22F2003/248
Inventor 广田晃一镰田真之桥本贵弘中村元
Owner SHIN ETSU CHEM CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap