Permanent magnet and manufacturing method for permanent magnet
A permanent magnet and manufacturing method technology, applied in the direction of inductance/transformer/magnet manufacturing, magnetic materials, magnetic objects, etc., can solve problems such as drop, reverse magnetization coercive force of magnet particles, etc., to reduce oxygen content, improve magnetic performance, Effect of suppressing grain growth
Inactive Publication Date: 2012-07-11
NITTO DENKO CORP
View PDF8 Cites 6 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
As a result, when a magnetic field is applied from the outside, there is a problem that the magnetization of each magnet particle is easily reversed and the coercive force decreases.
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 moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment
[0102] Hereinafter, examples of the present invention will be described while comparing them with comparative examples.
[0103] (Example)
[0104]In the alloy composition of the neodymium magnet powder of the example, the ratio of Nd is increased compared to the fraction based on the stoichiometric composition (Nd: 26.7% by weight, Fe (electrolytic iron): 72.3% by weight, B: 1.0% by weight), for example, by In terms of weight%, Nd / Fe / B=32.7 / 65.96 / 1.34 is set. In addition, 5% by weight of niobium n-propoxide was added as an organometallic compound to the pulverized neodymium magnet powder. In addition, for the calcination treatment by plasma heating, high-temperature hydrogen plasma was used, and the gas flow rate was set to 3 L / min for hydrogen gas, 3 L / min for argon gas, and 3 kW for plasma excitation. The irradiation time of the body was performed under the condition of 60 seconds. In addition, sintering of the shaped calcined body is performed by SPS sintering. In addi...
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
| Property | Measurement | Unit |
|---|---|---|
| thickness | aaaaa | aaaaa |
| thickness | aaaaa | aaaaa |
Login to View More
Abstract
There are provided a permanent magnet and a manufacturing method thereof capable of inhibiting grain growth of magnet grains having single domain particle size during sintering so as to improve magnetic properties. To fine powder of milled neodymium magnet is added an organometallic compound solution containing an organometallic compound expressed with a structural formula of M-(OR)x (M represents V, Mo, Zr, Ta, Ti, W or Nb, R represents a substituent group consisting of a straight-chain or branched-chain hydrocarbon, x represents an arbitrary integer) so as to uniformly adhere the organometallic compound to particle surfaces of the neodymium magnet powder. Thereafter, the desiccated magnet powder is calcined by utilizing plasma heating and the powdery calcined body is sintered so as to form a permanent magnet (1).
Description
technical field [0001] The present invention relates to a permanent magnet and a method for manufacturing the permanent magnet. Background technique [0002] In recent years, permanent magnet motors used in hybrid vehicles, hard disk drives, and the like have been required to be smaller and lighter, higher in output, and higher in efficiency. Furthermore, in order to realize size reduction, high output power, and high efficiency in the above-mentioned permanent magnet motor, the permanent magnet embedded in the permanent magnet motor needs to be thinned and further improved in magnetic properties. In addition, as permanent magnets, there are ferrite magnets, Sm-Co-based magnets, Nd-Fe-B-based magnets, Sm 2 Fe 17 N x Base magnets and the like, especially Nd-Fe-B base magnets with high residual magnetic flux density are used as permanent magnets for permanent magnet motors. [0003] Here, the powder sintering method is generally used as a method of manufacturing the perman...
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
Login to View More Patent Type & Authority Applications(China)
IPC IPC(8): H01F41/02B22F1/00B22F1/02C22C33/02C22C38/00H01F1/053H01F1/08
CPCH01F1/0577H01F1/086H01F41/0266C22C2202/02C22C33/02H01F1/0572H01F41/02H01F1/08B22F1/16
Inventor 尾关出光久米克也平野敬祐大牟礼智弘太白启介尾崎孝志
Owner NITTO DENKO CORP