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

Process for mfg Fe-B-Rareearth based permanent magnet with corrosion-resisting film

A technology of permanent magnets and rare earth elements, which is applied in the manufacture of permanent magnets, inductors/transformers/magnets, magnets, etc., and can solve problems such as difficulty in forming a uniform glass layer

Inactive Publication Date: 2004-08-18
HITACHI METALS LTD
View PDF5 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Japanese Patent Application Laid-Open No. 1-165105 shows that it is difficult to form a uniform glass layer when the thickness of the glass layer is less than 1 μm

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0070] Vacuum the canister to 1×10 -4 Pa, in which the magnet test piece was subjected to sputtering for 35 minutes under the conditions of an argon pressure of 10 Pa and a bias voltage of -400 V to clean the surface of the magnet.

[0071] Then, under the conditions of 0.2Pa argon pressure, -50V bias voltage and 250°C magnet temperature, the magnet test piece was subjected to arc ion plating treatment for 10 minutes with aluminum metal as the target, thereby forming aluminum film and then cooled. The formed aluminum film had a thickness of 0.5 μm.

[0072] The sol solution was prepared from the following components: aluminum compound, catalyst, stabilizer, organic solvent and water, as shown in Table 1, and the composition, viscosity and pH are shown in Table 2. The sol solution was applied to the magnet with the aluminum film according to the pulling rate shown in Table 3 by dip coating process, and then the heat treatment shown in Table 3 was performed to form an aluminum...

Embodiment 2

[0075] The magnet test piece was cleaned under the same conditions as in Example 1. Then, the aluminum (Al) wire used as the plating material is heated, evaporated, and ionized. Under the conditions of a hydrogen pressure of 1Pa and a voltage of 1.5kV, the magnet test piece is subjected to ion plating for 1 minute. An aluminum film is formed on the surface, and the film is then cooled. The formed aluminum film had a thickness of 0.9 μm.

[0076] The sol solution was prepared from the following components: aluminum compound, catalyst, stabilizer, organic solvent and water, as shown in Table 1, and the composition, viscosity and pH are shown in Table 2. The sol solution was applied to the magnet with the aluminum film according to the pulling rate shown in Table 3 by dip coating process, and then the heat treatment shown in Table 3 was performed to form an aluminum oxide film on the aluminum film. The formed film (Al 2 o x Film: 0

Embodiment 3

[0079] The magnet test piece was cleaned under the same conditions as in Example 1, followed by arc ion plating treatment for 2.5 hours to form an aluminum film on the surface of the magnet, and then cooled the film. The formed aluminum film had a thickness of 5 μm.

[0080] The sol solution was prepared from the following components: aluminum compound, catalyst, stabilizer, organic solvent and water, as shown in Table 1, and the composition, viscosity and pH are shown in Table 2. The sol solution was applied to the magnet with the aluminum film according to the pulling rate shown in Table 3 by dip coating process, and then the heat treatment shown in Table 3 was performed to form an aluminum oxide film on the aluminum film. The formed film (Al 2 o x Film: 0

[0081] The magnet made by the above process has an aluminum oxide film on its surface, and an aluminum fil...

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
thicknessaaaaaaaaaa
thicknessaaaaaaaaaa
thicknessaaaaaaaaaa
Login to View More

Abstract

An Fe-B-R based permanent magnet has a metal oxide film having a thickness of 0.01 mu m to 1 mu m on its surface with a metal film interposed therebetween. Thus, the film is excellent in adhesion to the surface of the magnet. Even if the permanent magnet is left to stand under high-temperature and high-humidity of a temperature of 80 DEG C and a relative humidity of 90 % for a long period of time, the magnetic characteristic of the magnet cannot be degraded. The magnet has a thermal shock resistance enough to resist even a heat cycle for a long period of time in a temperature range of -40 DEG C to 85 DEG C, and can exhibit a stable high magnetic characteristic. Therefore, it is possible to produce an Fe-B-R based permanent magnet having a corrosion-resistant film free from hexa-valent chromium.

Description

technical field [0001] The invention relates to an Fe-B-R based permanent magnet with excellent corrosion-resistant film and its manufacturing process. More specifically, the present invention relates to an Fe-B-R-based permanent magnet having an excellent corrosion-resistant film having good adhesion to the magnet surface on its surface and a manufacturing process thereof; the magnet has a temperature range of -40°C to 85°C Thermal shock resistance that is sufficient to withstand long-term thermal cycles; the magnet can exhibit stable high magnetic properties, and will not deteriorate even if the magnet is exposed to high temperature and high temperature conditions at a temperature of 80°C and a relative humidity of 90%; where The film does not contain hexavalent chromium. Background technique [0002] Fe-B-R-based permanent magnets represented by Fe-B-Nd-based permanent magnets are used in various fields because they are manufactured from cheap materials with abundant nat...

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): H01F7/00H01F41/02H01F41/14
CPCH01F41/026Y10T428/12465Y10T428/12611H01F7/00
Inventor 西内武司菊井文秋吉村公志
Owner HITACHI METALS LTD
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