Unlock instant, AI-driven research and patent intelligence for your innovation.

NdFeB magnetic wave-absorbing material and preparation method thereof

A magnetic wave-absorbing and raw material technology, applied to magnetic materials, magnetic objects, and inorganic materials, can solve problems such as poor temperature stability, high density of magnetic wave-absorbing materials, and easy corrosion, achieving good broadband effects and maximizing value , The effect that the preparation process is easy to master

Active Publication Date: 2016-03-30
GUILIN UNIV OF ELECTRONIC TECH
View PDF2 Cites 4 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the rare earth intermetallic compound magnetic wave-absorbing material has a high density (about 7.3g / cm 2 ), easy to corrode, poor temperature stability and other shortcomings, so it will be limited in practical application

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 magnetic wave-absorbing material and preparation method thereof
  • NdFeB magnetic wave-absorbing material and preparation method thereof
  • NdFeB magnetic wave-absorbing material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Preparation of industrial N45 neodymium-iron-boron alloy, the specific implementation steps are:

[0035] 1) Use praseodymium neodymium alloy, Fe, Co, Nb, Gd, B with a purity ≥ 99.50% as raw materials, according to (PrNd) 30 , Fe 66 、Co 1.0 , Nb 0.5 、Gd 1.5 , B stoichiometric ratio ingredients;

[0036] 2) Smelting in a standard industrial vacuum induction belt furnace under vacuum protection;

[0037] 3) Perform HD treatment on the flakes that have been spun, activated under vacuum or argon protection at 150-350°C for 1 hour, then absorb hydrogen for 2.5 hours, then dehydrogenate at 520°C for 7 hours, and finally water-cool to below 30°C for sampling;

[0038] 4) Grinding the sample after HD treatment, sieving and making powder under a 200-mesh sieve, to obtain N45 NdFeB alloy powder.

[0039] After testing, the product is mixed according to the ratio of N45 alloy powder: paraffin wax = 4:1 (mass ratio), and the outer diameter and inner diameter are 7mm and 3mm r...

Embodiment 2

[0045] Preparation of industrial N45 neodymium-iron-boron alloy, the specific implementation steps are:

[0046] 1) Use praseodymium neodymium alloy, Fe, Co, Nb, Gd, B with a purity ≥ 99.50% as raw materials, according to (PrNd) 30 , Fe 66 、Co 1.0 , Nb 0.5 、Gd 1.5、 B stoichiometric ratio ingredients;

[0047] 2) Smelting in a standard industrial vacuum induction belt furnace under vacuum protection;

[0048] 3) Perform HD treatment on the flakes that have been spun, activated under vacuum or argon protection at 150-350°C for 1 hour, then absorb hydrogen for 2.5 hours, then dehydrogenate at 520°C for 7 hours, and finally water-cool to below 30°C for sampling;

[0049] 4) The HD powder is processed by an industrial jet milling process, and the HD-treated N45 alloy coarse powder is put into a jet mill with a system oxygen content of 0.02% at a speed of 2600 rpm to obtain N45 NdFeB alloy powder body.

[0050] The product has been tested: according to the ratio of N45 alloy ...

Embodiment 3

[0054] Preparation of industrial N45 neodymium-iron-boron alloy, the specific implementation steps are:

[0055] 1) Use praseodymium neodymium alloy, Fe, Co, Nb, Gd, B with a purity ≥ 99.50% as raw materials, according to (PrNd) 30 , Fe 66 、Co 1.0 , Nb 0.5 、Gd 1.5 , B stoichiometric ratio ingredients;

[0056] 2) Smelting in a standard industrial vacuum induction belt furnace under vacuum protection;

[0057] 3) Perform HD treatment on the flakes that have been spun, activated under vacuum or argon protection at 150-350°C for 1 hour, then absorb hydrogen for 2.5 hours, then dehydrogenate at 520°C for 7 hours, and finally water-cool to below 30°C for sampling;

[0058] 4) The HD powder is processed by an industrial jet mill process, and the N45 alloy coarse powder processed by HD is put into a jet mill with a system oxygen content of 0.02%, and the rotating speed is 2600 rpm;

[0059] 5) The airflow mill obtained with a particle size of 3-5 μm, then put stainless steel ba...

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
The inside diameter ofaaaaaaaaaa
Thicknessaaaaaaaaaa
Thicknessaaaaaaaaaa
Login to View More

Abstract

The invention discloses an NdFeB magnetic wave-absorbing material and a preparation method therefor. An alloy is industrial N45 neodymium iron boron powder and prepared by the method including the main steps as follows: taking a praseodymium-neodymium alloy with the purity greater than or equal to 99.50%, Fe, Co, Nb, Gd and B as the raw materials; dosing the raw materials based on the stoichiometric ratio of (PrNd) 30, Fe 66, Co 1.0, Nb 0.5, Gd 1.5 and B; smelting the raw materials under vacuum protection; and preparing melt-spinning slices into powder by adopting a process of hydrogen decrepitation, a process of hydrogen decrepitation and air flow milling, and a process of hydrogen decrepitation, air flow milling and ball milling, and the like; the wave-absorbing performances of the NdFeB magnetic wave-absorbing material prepared from the different powder-making processes are analyzed; the preparation process of hydrogen decrepitation, air flow milling and ball milling is originally created in the invention; the method has the advantages of simple preparation process, low cost and the like, and the industrial production of the NdFeB magnetic wave-absorbing material can be achieved easily; and in addition, the neodymium iron boron production line can be effectively utilized to realize value maximization of the product.

Description

technical field [0001] The invention relates to a magnetic wave-absorbing material, in particular to a NdFeB magnetic wave-absorbing material and a preparation method thereof. Background technique [0002] Microwave electromagnetic technology is more and more widely used in various fields of society, which brings great convenience to people's life, but at the same time it also brings serious electromagnetic pollution to society and poses a serious threat to human health. In order to solve People have done a lot of research work on the harm caused by electromagnetic radiation. Among them, in the microwave band (especially in the 2-18GHz frequency band), magnetic wave-absorbing materials are used to guide electromagnetic waves and convert electromagnetic wave energy into other forms of energy, so as to suppress electromagnetic wave radiation and interference, which has a good effect. For example, if magnetic wave-absorbing materials are applied to the surfaces of TVs, compute...

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
IPC IPC(8): H01F1/057H01F1/06B22F9/16
Inventor 潘顺康熊吉磊曾阳庆成丽春饶光辉周怀营
Owner GUILIN UNIV OF ELECTRONIC TECH