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A kind of anti-corrosion vehicle magnetic steel and preparation method thereof

A corrosion-resistant and magnetic steel technology, applied in the direction of magnetic objects, magnetic materials, inorganic materials, etc., can solve the problems of increasing the production cost of sintered NdFeB magnets, failing to meet the requirements of the vehicle field, development constraints, etc., to achieve good performance , reduce weight loss and save cost

Active Publication Date: 2020-09-01
ZHEJIANG ZHONGHANG NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The mass of rare earth elements in sintered NdFeB permanent magnets accounts for about 30%. At present, with the continuous expansion of my country's rare earth permanent magnet industry, my country's rare earth reserves of precious resources are getting less and less, which leads to the production of sintered NdFeB permanent magnets. The price of main rare earth metals, such as praseodymium, neodymium, dysprosium, etc. is getting higher and higher, which greatly increases the production cost of sintered NdFeB magnets, making the development of the industry quite restricted
[0003] In addition, with the continuous improvement of the requirements for vehicle accessories, the performance requirements for sintered NdFeB magnets have also been improved, and the traditional performance of sintered NdFeB magnets has gradually been unable to meet the growing requirements of the automotive field.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A corrosion-resistant automotive magnet provided in this embodiment includes NdFeB magnets and corrosion-resistant ceramic powder sprayed on the surface of the NdFeB magnets, wherein the NdFeB magnets are composed of the following components: rare earth elements R: 30wt%, Al: 0.8wt%, Pr: 0.04wt%, C: 0.05wt%, Cu: 0.5wt%, Nd: 0.1wt%, Ga: 0.3wt%, Pm: 0.4wt%, Co: 0.9 wt%, B: 0.95wt%, Fe balance; the rare earth element R is a mixture of Ce, Ho, Sm, Dy, Tm, and its mixed mass ratio is Ce: Ho: Sm: Dy: Tm=5:4 :1:0.3:2.

[0025] The corrosion-resistant ceramic powder includes 40 parts by weight of silicon fluoride, 22 parts of titanium dioxide, 15 parts of aluminum oxide, 15 parts of tetrafluoroethylene, 3 parts of silicon carbide, 5 parts of yttrium oxide, 2 parts of tricresyl phosphate, 0.5 parts ammonium molybdate.

[0026] The preparation method of the above-mentioned corrosion-resistant automotive magnetic steel comprises the following steps:

[0027] The first step: the...

Embodiment 2

[0039] The preparation method of a corrosion-resistant automotive magnet provided in this example is completely consistent with Example 1, the main difference is that the mass percentage of the raw material components is different. In this example, the iron-boron magnet is composed of the following components: rare earth Elements R: 28.5wt%, Al: 0.8wt%, Pr: 0.04wt%, C: 0.05wt%, Cu: 0.5wt%, Nd: 0.08wt%, Ga: 0.3wt%, Pm: 0.4wt%, Co : 0.9wt%, B: 0.95wt%, Fe balance; the rare earth element R is a mixture of Ce, Ho, Sm, Dy, Tm, and its mixed mass ratio is Ce: Ho: Sm: Dy: Tm=5 :4:1:0.3:2.

[0040] The obtained product is 20mm×15mm×1.5mm, and its magnetic performance is tested with NIM2000 magnetic measuring instrument of China Metrology Institute. The results are shown in Table 1.

Embodiment 3

[0042] The preparation method of a corrosion-resistant automotive magnet provided in this example is completely consistent with Example 1, the main difference is that the mass percentage of the raw material components is different. In this example, the iron-boron magnet is composed of the following components: rare earth Elements R: 29.5wt%, Al: 0.8wt%, Pr: 0.04wt%, C: 0.05wt%, Cu: 0.5wt%, Nd: 0.1wt%, Ga: 0.3wt%, Pm: 0.4wt%, Co : 0.9wt%, B: 0.95wt%, Fe balance; the rare earth element R is a mixture of Ce, Ho, Sm, Dy, Tm, and its mixed mass ratio is Ce: Ho: Sm: Dy: Tm=5 :4:1:0.3:2.

[0043] The obtained product is 20mm×15mm×1.5mm, and its magnetic performance is tested by the NIM2000 magnetic measuring instrument of the China Metrology Institute; at the same time, a common NdFeB magnet on the market is 20mm×15mm×1.5mm, and the results are shown in Table 1.

[0044] Table 1:

[0045] Remanence / KGs Magnetic energy product / MGOe Internal coercive force / KOe Exa...

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Abstract

The invention discloses corrosion-resistant magnetic steel for a vehicle. The corrosion-resistant magnetic steel for the vehicle comprises neodymium iron boron magnetic steel and corrosion-resistant ceramic powder sprayed to the surface of the neodymium iron boron magnetic steel. The neodymium iron boron magnetic steel consists of the following components: 27.5-30.5wt% of rare earth elements R, 0.5-1.0wt% of Al, 0.03-0.06wt% of Pr, 0.03-0.06wt% of C, 0.35-0.5wt% of Cu, 0.08-0.12wt% of Nd, 0.2-0.4wt% of Ga, 0.2-0.5wt% of Pm, 0.6-1.2wt% of Co, 0.75-1.35wt% of B and the balance of Fe. The rare earth element R is a mixture of Ce, Ho, Sm, Dy and Tm, and the mass of Ce, Ho, Sm, Dy and Tm during mixing is Ce: Ho: Sm: Dy: Tm= 5: 4: 1: 0.3: 2. The rare earth elements such as Ho, Ce, Sm, Dy and Tm are added in the magnetic steel to replace part of expensive Nd and Pr, the cost is reduced, by addition of Ho, the corrosion resistance of the corrosion-resistant magnetic steel for the vehicle can beimproved effectively, and weight loss is relieved. The corrosion-resistant ceramic powder is further sprayed to the surface of the neodymium iron boron magnetic steel, and therefore, the corrosion resistance of the neodymium iron boron magnetic steel is improved.

Description

technical field [0001] The invention relates to a corrosion-resistant magnetic steel for vehicles, in particular to a corrosion-resistant magnetic steel for vehicles and a preparation method thereof. Background technique [0002] Due to its superior magnetic properties, sintered NdFeB has been used in new energy fields such as wind power generation and new energy vehicles in recent years, and has become one of the key materials to promote the rapid development of the new energy industry. The mass of rare earth elements in sintered NdFeB permanent magnets accounts for about 30%. At present, with the continuous expansion of my country's rare earth permanent magnet industry, my country's rare earth reserves of precious resources are becoming less and less, which leads to the production of sintered NdFeB permanent magnets. The price of main rare earth metals, such as praseodymium, neodymium, and dysprosium, is getting higher and higher, which greatly increases the production cost...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F1/057H01F1/08C22C38/06C22C38/16C22C38/10
CPCC22C38/002C22C38/005C22C38/06C22C38/10C22C38/16H01F1/0572H01F1/0577
Inventor 徐嘉诚
Owner ZHEJIANG ZHONGHANG NEW MATERIAL