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

NdFeB alloy vacuum melting method

A technology of vacuum smelting and vacuum induction smelting, which is applied in the field of vacuum smelting of NdFeB alloys, can solve the problems of affecting magnetic properties, great influence of ultimate vacuum degree, unsuitable for NdFeB magnet production, etc., and achieves the effect of reducing loss

Active Publication Date: 2019-02-01
ZHAOQING SANHUAN JINGYUE MAGNETIC MATERIAL +1
View PDF3 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the above method of secondary feeding has a great influence on the ultimate vacuum of the equipment, which will cause the rare earth in the NdFeB magnet to oxidize and affect the magnetic performance, so it is not suitable for the production of NdFeB magnets

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
  • NdFeB alloy vacuum melting method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0029] Table 1 shows Examples and Comparative Examples according to the present invention. In Table 1, "recipe ingredient" is the weight of each ingredient put into the crucible according to the recipe. "Comparative example" is the NdFeB alloy obtained after smelting by the conventional method, and the weight percentage of each component obtained by component analysis. "Example" is the NdFeB alloy prepared by the method of the present invention, and the weight percentage of each component obtained by component analysis. Among them, in Examples, metals Tb and Ga were placed in a container made of Al. Therefore, the loss of Tb was only 0.02, whereas the loss of Tb in the comparative example was 0.27. Therefore, the loss of Tb is greatly reduced. Ga basically has no loss.

[0030] Table 1

[0031]

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

No PUM Login to View More

Abstract

The invention provides a vacuum smelting method of a neodymium iron boron alloy. The method comprises the following steps: all components are prepared according to a formula of the neodymium iron boron alloy; at least one component is put in a closed hollow container; all the components are put in a vacuum induction smelting furnace, and the container accommodated with at least one component is finally put in; and all the components are heated and smelted in the vacuum induction smelting furnace. The vacuum smelting method of the neodymium iron boron alloy can reduce the loss of rare earth and / or low-smelting point metal in the vacuum smelting process through using an auxiliary container, and is free of influencing a limit vacuum degree due to once feeding, so that the magnetic performance is not influenced.

Description

technical field [0001] The invention relates to a vacuum smelting method for neodymium-iron-boron alloys, which can reduce the loss of rare earth and / or low melting point metals in the vacuum smelting process. Background technique [0002] In the production process of sintered NdFeB magnets, it is sometimes necessary to add some heavy rare earth and / or low melting point metals to increase the coercive force of the magnet. During the smelting process, these heavy rare earths and / or low-melting point metals, especially heavy rare earths, have a very large loss during the heating-up smelting process due to their low melting point. [0003] Patent document CN103060660A discloses a method for preparing Fe-Ga-In-Tb alloy by vacuum induction melting with secondary feeding. In this method, after the iron is melted, In, Tb, and Ga are added in the way of secondary feeding to continue smelting. [0004] However, the above method of secondary feeding has a great influence on the ulti...

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): C22C38/16C22C33/04
Inventor 刘岩
Owner ZHAOQING SANHUAN JINGYUE MAGNETIC MATERIAL
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