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

r-t-b sintered magnet

A R-T-B, sintered magnet technology, applied in the direction of magnets, magnetic objects, magnetic materials, etc., can solve the problem of low corrosion resistance, and achieve the effect of excellent corrosion resistance and good magnetic properties

Active Publication Date: 2015-08-19
TDK CORPARATION
View PDF7 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] R-T-B (R is one or more rare earth elements, T is one or more transition metal elements containing Fe or Fe and Co) type sintered magnets have excellent magnetic properties, but because they contain rare earth elements that are easily oxidized elements and therefore tend to have low corrosion resistance

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-t-b sintered magnet
  • r-t-b sintered magnet
  • r-t-b sintered magnet

Examples

Experimental program
Comparison scheme
Effect test

no. 1 approach

[0066]

[0067] An embodiment of the R-T-B based sintered magnet according to the present embodiment will be described. The R-T-B system sintered magnet involved in this embodiment has R 2 T 14 B (R is at least one type of rare earth element, T represents one or more transition metal elements containing Fe or Fe and Co) crystal grains of R-T-B sintered magnets, in which two or more adjacent R 2 T 14 There are R-O-C concentrated parts in the grain boundary formed by B crystal grains, compared with R 2 T 14 The concentration of R, O, and C in the R-O-C concentrated portion in the B crystal grains is higher, and the ratio (O / R) of O atoms to R atoms in the R-O-C concentrated portion satisfies the following formula (1).

[0068] 0.4<(O / R)<0.7 (1)

[0069] The grain boundary consists of 2 R 2 T 14 The two-grain interface formed by B crystal grains is composed of more than three adjacent R 2 T 14 Polycrystalline grain boundary portion (triple point) formed by B crystal gr...

no. 2 approach

[0171]

[0172] An embodiment of the R-T-B based sintered magnet according to the second embodiment of the present invention will be described. The R-T-B system sintered magnet involved in this embodiment has R 2 T 14 The R-T-B system sintered magnet with B crystal grains is composed of two or more adjacent R 2 T 14 There are R-O-C-N concentrated parts in the grain boundary formed by B crystal grains, compared with R 2 T 14 The concentration of R, O, C, and N in the R-O-C-N concentrated part in the B crystal grains is higher, and the ratio (O / R) of O atoms to R atoms in the R-O-C-N concentrated part satisfies the following formula (1)'.

[0173] 0.4<(O / R)<0.7 (1)’

[0174] The R-O-C-N concentrated part means that it exists in the grain boundary formed by two or more adjacent crystal grains, and the concentrations of R, O, C, and N are all higher than R 2 T 14 The region within the B crystal grain. The R-O-C-N enrichment part may contain components other than these as...

Embodiment 1

[0269]

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

The present invention provides an R-T-B based sintered magnet including R2T14B crystal grains wherein; a grain boundary is formed by two or more adjacent R2T14B crystal grains, an R—O—C concentrated part, in which concentrations of R, O and C are higher than those in the R2T14B crystal grains respectively, is in the grain boundary, and a ratio (O / R) of O atom to R atom in the R—O—C concentrated part satisfies the following formula (1): 0.4<(O / R)<0.7.

Description

technical field [0001] The present invention relates to an R-T-B system sintered magnet mainly composed of a rare earth element (R), at least one transition metal element (T) containing Fe or Fe and Co as essential components, and boron (B). Background technique [0002] R-T-B (R is one or more rare earth elements, and T is one or more transition metal elements containing Fe or Fe and Co) type sintered magnets have excellent magnetic properties, but because they contain rare earth elements that are easily oxidized elements and therefore tend to have low corrosion resistance. [0003] Therefore, in order to improve the corrosion resistance of R-T-B based sintered magnets, the surface of the magnet body is usually subjected to surface treatment such as resin coating or plating, and used. On the other hand, by changing the added elements or internal structure of the magnet body, the corrosion resistance of the magnet body itself can also be improved. Improving the corrosion r...

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): H01F1/057B22F3/00C22C33/02C22C38/00H01F1/08B22F1/06
CPCB22F2003/248C22C33/0278C22C38/14B22F2999/00C22C38/005C22C38/16C22C38/06C22C38/10B22F3/02B22F3/24H01F1/0577C22C38/00B22F2202/05C22C38/002B22F1/0007B22F1/06H01F7/021
Inventor 三轮将史中嶋春菜西川健一日高彻也萩原淳石坂力
Owner TDK CORPARATION