Manufacturing method of high-mechanical-strength sintered neodymium iron boron permanent magnets

A technology of mechanical strength and manufacturing method, which is applied in the direction of inductance/transformer/magnet manufacturing, magnetic objects, magnetic materials, etc., can solve problems such as poor strength and toughness, peeling, falling edges and corners, etc., to improve fracture toughness and bending resistance Strength, improve bending strength, increase the effect of mechanical properties

Active Publication Date: 2012-07-11
西安西工大思强科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, this kind of functional material with excellent magnetic properties and wide application has the disadvantages of poor strength and toughness, and its mechanical processing is difficult. The processing of existing products is at the cost of reducing the yield of 10% to 15%, and in the process of production and use There are often problems such as peeling, edge drop, cracking, etc.

Method used

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  • Manufacturing method of high-mechanical-strength sintered neodymium iron boron permanent magnets
  • Manufacturing method of high-mechanical-strength sintered neodymium iron boron permanent magnets
  • Manufacturing method of high-mechanical-strength sintered neodymium iron boron permanent magnets

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Step 1, take by weighing 25kg of neodymium, 0.49kg of titanium, 0.62kg of cobalt, 6.63kg of iron-boron alloy, and 67.26kg of iron, wherein the mass purity of neodymium, iron, titanium, cobalt and iron-boron alloy is not less than 99.5%, and the boron in the iron-boron alloy The mass percentage content is 19.3%;

[0028] Step 2. Mix the raw materials weighed in step 1 and place them in a strip furnace, and use a conventional quick-setting process to prepare a 0.45mm thickness under the condition that the vacuum degree is 10Pa and the surface speed of the roller is 0.8m / s. quick-setting tablets;

[0029] Step 3: Saturate the quick-setting tablet described in step 2 with hydrogen absorption at room temperature for 6 hours, then dehydrogenate the saturated quick-setting tablet at a temperature of 570°C to make hydrogen explosion powder, and then hydrogen explosion The powder adopts the conventional jet milling process, and the magnetic powder with an average particle size ...

Embodiment 2

[0035]Step 1. Weigh 35kg of neodymium, 0.51kg of titanium, 0.58kg of cobalt, 3.91kg of iron-boron alloy, and 60kg of iron, wherein the mass purity of neodymium, iron, titanium, cobalt and iron-boron alloy is not less than 99.5%, and the mass of boron in the iron-boron alloy The percentage content is 19.7%;

[0036] Step 2. Mix the raw materials weighed in step 1 and place them in a strip furnace, and use a conventional quick-setting process to prepare a 0.4mm-thick film under the conditions of a vacuum of 5Pa and a surface speed of the roller of 0.85m / s. quick-setting tablets;

[0037] Step 3. Saturate the quick-setting tablet described in step 2 with hydrogen absorption at room temperature for 4 hours, then dehydrogenate the saturated quick-setting tablet at a temperature of 550°C to make hydrogen explosion powder, and then hydrogen explosion The powder adopts the conventional jet milling process, and the magnetic powder with an average particle size of 3.4 μm is made under ...

Embodiment 3

[0042] Step 1, take by weighing 30kg of neodymium, 0.50kg of titanium, 0.60kg of cobalt, 5.23kg of iron-boron alloy, and 63.67kg of iron, wherein the mass purity of neodymium, iron, titanium, cobalt and iron-boron alloy is not less than 99.5%, and the boron in the iron-boron alloy The mass percentage content is 19.5%;

[0043] Step 2. Mix the raw materials weighed in step 1 and place them in a strip furnace. Use a conventional quick-setting process to prepare a 0.43mm thick film under the condition that the vacuum degree is 1Pa and the surface speed of the roller is 0.83m / s. quick-setting tablets;

[0044] Step 3. Saturate the quick-setting tablet described in step 2 with hydrogen absorption at room temperature for 5 hours, then dehydrogenate the saturated quick-setting tablet at a temperature of 560°C to make hydrogen explosion powder, and then hydrogen explosion The powder adopts conventional jet milling process, and the magnetic powder with an average particle size of 3.5 ...

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Abstract

The invention discloses a manufacturing method of high-mechanical-strength sintered neodymium iron boron permanent magnets, which includes: firstly, utilizing rare-earth elements, iron, titanium, cobalt and boron iron alloy as raw materials and weighing the raw materials; secondly, mixing the weighed raw materials and disposing the same in a vacuum melting induction furnace, and preparing quick-hardened tablets by means of quick hardening process; thirdly, saturating the quick-hardened tablets to absorb hydrogen at the room temperature and dehydrogenating the same to prepare hydrogen decrepitation powder, then preparing magnetic powder by the hydrogen decrepitation powder through jet mill process; fourthly, molding the magnetic powder in an oriented manner, pressing to form magnets, disposing the magnets into a vacuum sintering furnace to be sintered in a vacuum environment, and performing tempering heat treatment to obtain blanks; and fifthly, machining the blanks, cleaning and removing oil, scouring to obtain high-mechanical-strength sintered neodymium iron boron permanent magnets with bending resistance strength not lower than 500MPa and impact toughness not lower than 7.5KJ / m2. By the manufacturing method, processing difficulty of the sintered neodymium iron boron permanent magnets is reduced greatly, application range of the sintered neodymium iron boron permanent magnets is broadened and economic potential thereof is high.

Description

technical field [0001] The invention belongs to the technical field of rare earth permanent magnet materials, and in particular relates to a method for manufacturing a sintered NdFeB permanent magnet with high mechanical strength. Background technique [0002] Sintered NdFeB permanent magnet material belongs to the third generation rare earth permanent magnet material. Compared with other types of permanent magnet materials, it has outstanding advantages such as high magnetic performance and low price, which makes its development and application have achieved extraordinary development. At present, its comprehensive magnetic properties have reached a high level, and its application has involved various fields of the national economy, especially in computer, information, automobile, nuclear magnetic resonance imaging, CD-ROM, DVF and other industries. [0003] However, this kind of functional material with excellent magnetic properties and wide application has the disadvantage...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F7/02H01F1/057H01F41/02C22C38/14C23G1/08C23G1/19B22D11/06B22F9/04
Inventor 邹光荣
Owner 西安西工大思强科技股份有限公司
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