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Rare earth ReCrO3 magnetic wave-absorbing material and preparation method thereof

A magnetic wave-absorbing and rare-earth technology, applied in chemical instruments and methods, and other chemical processes, can solve problems such as poor temperature stability, high density of magnetic wave-absorbing materials, and easy corrosion, and achieve good corrosion resistance and temperature stability , wide absorption frequency band, good oxidation resistance and corrosion resistance

Active Publication Date: 2015-03-11
GUILIN UNIV OF ELECTRONIC TECH
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  • 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

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  • Rare earth ReCrO3 magnetic wave-absorbing material and preparation method thereof
  • Rare earth ReCrO3 magnetic wave-absorbing material and preparation method thereof
  • Rare earth ReCrO3 magnetic wave-absorbing material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Preparation of SmCrO 3 The specific steps are:

[0034] 1) Sm with a purity ≥ 99.50% 2 o 3 、Cr 2 o 3 Powder as raw material, according to SmCrO 3 Stoichiometric ratio ingredients of molecular formula;

[0035] 2) Grind in an agate bowl mill for half an hour to mix well;

[0036] 3) Press the uniformly mixed powder into flakes with a diameter of 1.5cm and a thickness of 0.3~0.8cm, with a pressure of 20~30MPa;

[0037] 4) After the powder is mixed evenly, the pressed flakes are sintered in the atmosphere at a temperature of 1500 °C;

[0038] 5) Carry out 1500℃×24 sintering heat treatment on the thin slice in the atmosphere, that is, the sintering temperature is 1500℃ for 24h;

[0039] 6) Break the sintered flakes into fine powder with particle size less than 0.3mm.

[0040] Product testing by SmCrO 3 Powder: paraffin wax = 4:1 (mass ratio) mixed to make coaxial samples with outer and inner diameters of 7mm and 3mm respectively, and thicknesses of 1.3mm, 1.5mm an...

Embodiment 2

[0046] Preparation of EuCrO 3 The specific implementation steps are:

[0047] 1) Eu with purity ≥ 99.50% 2 o 3 、Cr 2 o 3 Powder as raw material, according to EuCrO 3 Stoichiometric ratio ingredients of molecular formula;

[0048] 2) Grind in an agate bowl mill for half an hour to mix well;

[0049] 3) Press the uniformly mixed powder into flakes with a diameter of 1.5cm and a thickness of 0.3~0.8cm, with a pressure of 20~30MPa;

[0050] 4) After the powder is mixed evenly, the pressed flakes are sintered in the atmosphere at a temperature of 1500 °C;

[0051] 5) Carry out 1500℃×24 sintering heat treatment on the thin slice in the atmosphere, that is, the sintering temperature is 1500℃ for 24h;

[0052] 6) Break the sintered flakes into fine powder with particle size less than 0.3mm.

[0053] Product testing: by EuCrO 3 Powder: paraffin wax = 4:1 (mass ratio) mixed to make coaxial samples with outer and inner diameters of 7mm and 3mm respectively, and thicknesses of 1...

Embodiment 3

[0057] Preparation of DyCrO 3 The specific implementation steps are:

[0058] 1) Dy with a purity ≥ 99.50% 2 o 3 、Cr 2 o 3 Powder as raw material, according to DyCrO 3 Stoichiometric ratio ingredients of molecular formula;

[0059] 2) Grind in an agate bowl mill for half an hour to mix well;

[0060] 3) Press the uniformly mixed powder into flakes with a diameter of 1.5cm and a thickness of 0.3~0.8cm, with a pressure of 20~30MPa;

[0061] 4) After the powder is mixed evenly, the pressed flakes are sintered in the atmosphere at a temperature of 1500 °C;

[0062] 5) Carry out 1500℃×24 sintering heat treatment on the thin slice in the atmosphere, that is, the sintering temperature is 1500℃ for 24h;

[0063] 6) Break the sintered flakes into fine powder with particle size less than 0.3mm.

[0064] Product Test: By DyCrO 3 Powder: paraffin wax = 4:1 (mass ratio) mixed to make coaxial samples with outer and inner diameters of 7mm and 3mm respectively, and thicknesses of 1....

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Abstract

The invention relates to a rare earth ReCrO3 magnetic wave-absorbing material and a preparation method thereof. The preparation method includes: compounding Re2O3 and Cr2O3 powder with purity of greater than or equal to 99.50% in a molecular ratio of 1:1, performing milling for half an hour in an agate mortar so mix the powder uniformly, pressing the uniformly mixed powder into slices, conducting heat preservation on the slices for 24h at 1500DEG C under vacuum or argon protection to carry out sintering treatment, and then performing furnace cooling. The preparation process involved in the invention is simple, and the material provided by the invention has good microwave absorption properties in the microwave band of 2-18GHz, and has the characteristics of wide absorption band, good oxidation resistance and temperature stability, no Co, Ni or other strategic metal elements, low price and the like. Thus, the rare earth ReCrO3 magnetic wave-absorbing material is more suitable for preparation of microwave absorption products with high microwave absorbing efficiency, small material density, good non-oxidation and corrosion resistance, and good thermal stability.

Description

technical field [0001] The invention relates to magnetic wave-absorbing materials, specifically rare earth ReCrO 3 Magnetic wave-absorbing material and its preparation method. Background technique [0002] In recent years, with the rapid development of radar technology, the requirements for stealth technology will become higher and higher, and microwave absorbing materials are one of the frontier topics in stealth technology. In addition, a large number of electronic devices have entered daily life, and the deteriorating electromagnetic environment will interfere with the normal operation of electronic instruments and equipment and affect human health. Absorbing electromagnetic waves with microwave absorbing materials is an effective protective measure. It can be seen that the research on microwave absorbing materials has far-reaching significance in both military and civilian applications. In addition, in modern warfare, information acquisition and anti-acquisition have ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/12C04B35/622C09K3/00
Inventor 潘顺康刘烨成丽春饶光辉林培豪
Owner GUILIN UNIV OF ELECTRONIC TECH
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