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Heat and corrosion resistant Nd-Fe-B permanent magnetic material with good mechanical properties and producing method

A corrosion-resistant, permanent magnetic material technology, applied in the direction of magnetic materials, magnetic objects, inductors/transformers/magnets, etc., can solve the problems of corrosion resistance and mechanical properties without implementation examples, low magnetic properties, etc.

Inactive Publication Date: 2006-07-19
海安县磁性材料二厂
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the above three research patents, the heat resistance of NdFeB was studied and developed, but there were no examples of its corrosion resistance and mechanical properties, and its magnetic properties were low

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] (1) The following weight components are mixed and prepared into an ingot alloy by medium frequency induction melting:

[0033] Nd 22% Dy 5.8%

[0034] Pr 5% Tb 1.8%

[0035] Co 2%

[0036] Nb 0.2% Al 0.3%

[0037] Cu 0.24% Ga 0.22%

[0038] B 1% Fe balance;

[0039] (2) Break the ingot alloy, and use jet mill to make 3-5μm (can be 3μm, 4μm, 5μm) powder, the magnetic field orientation is greater than 796KA / m magnetic field orientation, and the unit pressure is 98-196Mpa (example 98Mpa, 148Mpa , 196Mpa), the pressing direction is perpendicular or parallel to the direction of the magnetic field, and isostatic pressing at 200Mpa; then sintering: vacuuming to 10 -2 Start heating at Pa, and wait for the vacuum degree to reach 10 -2 Pa and then filled with argon protection, the sintering temperature is 1090°C, the time is 4h; the sintered magnet is under the protection of argon, at 890°C for a period of aging treatment, the treatment time is 1.5h, and then at 560°C for t...

Embodiment 2

[0056] (1) The following weight components are mixed and prepared into an ingot alloy by medium frequency induction melting:

[0057] Nd 21% Dy 4.2%

[0058] Pr 5.9% Tb 2%

[0059] Co 1%

[0060] Nb 0.2% Al 0.2%

[0061] Cu 0.14% Ga 0.12%

[0062] B 1.02% Fe balance

[0063] (2) The ingot alloy is broken, and it is made into powder of 3-5 μm (can be 3 μm, 4 μm, 5 μm) by jet mill, and the magnetic field orientation is greater than 796KA / m magnetic field orientation, and the unit pressure is 98-196Mpa (example 98Mpa, 148Mpa) , 196Mpa), the pressing direction is perpendicular or parallel to the direction of the magnetic field, and isostatic pressing at 200Mpa; then sintering: vacuuming to 10 -2 Start heating at Pa, and wait for the vacuum degree to reach 10 -2 Pa and then filled with argon protection, the sintering temperature is 1070°C, the time is 4h; the sintered magnet is under the protection of argon, at 900°C for a period of aging treatment, the treatment time is 1.5h...

Embodiment 3

[0080] (1) The following weight components are mixed and prepared into an ingot alloy by medium frequency induction melting:

[0081] Nd 19% Dy 5.3%

[0082] Pr 4.86% Tb 2.44%

[0083] Co 1%

[0084] Nb 0.5% Al 0.2%

[0085] Cu 0.14% Ga 0.4%

[0086] B 0.98% Fe balance

[0087] (2) The ingot alloy is broken, and it is made into powder of 3-5 μm (can be 3 μm, 4 μm, 5 μm) by jet mill, and the magnetic field orientation is greater than 796KA / m magnetic field orientation, and the unit pressure is 98-196Mpa (example 98Mpa, 148Mpa) , 196Mpa), the pressing direction is perpendicular or parallel to the direction of the magnetic field, and isostatic pressing at 200Mpa; then sintering: vacuuming to 10 -2 Start heating at Pa, and wait for the vacuum degree to reach 10 -2 Pa and then filled with argon protection, the sintering temperature is 1090°C, the time is 4h; the sintered magnet is under the protection of argon, at 900°C for a period of aging treatment, the treatment time is 1...

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PUM

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Abstract

The invention relates to a heat-resistant corrosion-resistant neodymium iron boron permanent magnetic material with better mechanics property, which is formed by Nd, Dy, Pr, Tb, Fe, Co, Nb, Al, Cu, Ga and B. The producing method comprises: mixing the components; using middle-frequency sensing melting to attain casting alloy; breaking the casting alloy to be milled via the airflow into the powder with 3-5 mu m; when the magnetic field direction is larger than 796KA / m, compressing under the pressure of 98-196MPa to be processed with constant stable pressure; then sintering and cooling into room temperature in nitrogen gas to attain the product. The invention has better mechanic property, better heat-resistant and corrosion-resistant properties.

Description

Technical field: [0001] The utility model relates to a neodymium iron boron permanent magnet material and a production method. Background technique: [0002] Sintered NdFeB produced by powder metallurgy has developed rapidly due to its high performance-price ratio, and has been widely used in many fields such as aerospace, information electronics, energy, transportation, communication, and medical care. Its application is of great significance to the development of integration, miniaturization, light weight and intelligence of the information industry. At present, the highest performance of domestic sintered NdFeB is 53MGOe, and the highest performance of foreign sintered NdFeB is 55MGOe. It almost reaches 85% of the theoretical value, but these sintered NdFeB magnets with high magnetic energy product have poor mechanical properties and poor magnetic stability during their use, especially when they are used in thermal and corrosive environments. , its performance attenuati...

Claims

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Application Information

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IPC IPC(8): H01F1/055H01F41/02
Inventor 陈栋孙秀芳
Owner 海安县磁性材料二厂
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