A low magnetic moment, small loss, high temperature stability garnet ferrite material

A ferrite material, high-temperature technology, applied in the field of microwave technology and magnetic materials, can solve the problems of material temperature performance deterioration, unable to meet the actual use requirements, etc., to achieve reduced material loss, low saturation magnetization, and small loss Effect

Active Publication Date: 2021-08-27
SOUTHWEST INST OF APPLIED MAGNETICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

According to the published reports, the saturation magnetization of practical garnet ferrite materials is higher than 32kA / m. When the saturation magnetization drops below 32kA / m, the temperature performance of the material will deteriorate and cannot meet the actual requirements. Requirements

Method used

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  • A low magnetic moment, small loss, high temperature stability garnet ferrite material
  • A low magnetic moment, small loss, high temperature stability garnet ferrite material
  • A low magnetic moment, small loss, high temperature stability garnet ferrite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] According to chemical formula Y 3-m-n-(a+2x+y) Ca a+2x+y Gd m Nd n sn a Ni c V x Ge c+y Al z Fe 5-a-b-c-x-(c+y)-z-δ o 12 , wherein: m=0.6, n=0.01, a=0.2, c=0.01, x=0.2, y=0.3, z=0.5, δ=0.1.

[0028] According to the formula design, calculate the various raw materials required, the raw material is analytically pure Y 2 o 3 , CaCO 3 、Gd 2 o 3 、Nd 2 o 3 , SnO 2 , NiO, V 2 o 5 、GeO 2 , Al(OH) 3 , Fe 2 o 3 Wait. Weigh the processed raw materials according to the calculation results; first wet ball mill for 6 hours and mix them evenly before drying; pre-burn at 1150°C and keep warm for 6 hours; then dry after the second wet ball mill for 10 hours, add 9% The polyvinyl alcohol is granulated, sintered at 1350°C after molding, and kept for 6 hours; finally, the performance parameter test is carried out.

[0029] Apparent Density ρ of Materials Tested by Drainage Method app , using a magnetic ring scale to measure the specific magnetization σ s , Curie ...

Embodiment 2

[0034] According to chemical formula Y 3-m-n-(a+2x+y) Ca a+2x+y Gd m Nd n sn a In b V x Ge y Al z Fe 5-a-b-x-y-z-δ o 12 , wherein: m=0.55, n=0.02, a=0.05, b=0.2, x=0.4, y=0.2, z=0.4, δ=0.15.

[0035] According to the formula design results, calculate the various raw materials required, the raw materials are analytically pure Y 2 o 3 , CaCO 3 、Gd 2 o 3 、Nd 2 o 3 , SnO 2 、In 2 o 3 , V 2 o 5 、GeO 2 , Al(OH) 3 , Fe 2 o 3 Wait. Weigh the processed raw materials according to the calculation results; first wet ball mill for 6 hours and mix them evenly before drying; pre-burn at 1200°C and keep warm for 5 hours; then dry after the second wet ball mill for 10 hours, add 9% The polyvinyl alcohol is granulated, and after molding, it is sintered at 1400 ° C and kept for 5 hours; finally, the performance parameter test is carried out.

[0036] Apparent Density ρ of Materials Tested by Drainage Method app , using a magnetic ring scale to measure the specific magn...

Embodiment 3

[0041] According to chemical formula Y 3-m-n-(a+2x+y) Ca a+2x+y Gd m Nd n sn a In b Ni c V x Ge c+y Al z Fe 5-a-b-c-x-(c+y)-z-δ o 12 , wherein: m=0.65, n=0.01, a=0.1, b=0.1, c=0.02, x=0.33, y=0.4, z=0.2, δ=0.15.

[0042] According to the formula design results, calculate the various raw materials required, the raw materials are analytically pure Y 2 o 3 , CaCO 3 、Gd 2 o 3 、Nd 2 o 3 , SnO 2 、In 2 o 3 , NiO, V 2 o 5 、GeO 2 , Al(OH) 3 , Fe 2 o 3 Wait. Weigh the processed raw materials according to the calculation results; once wet ball mill for 6 hours to mix evenly and then dry; pre-fire at 1250°C and keep warm for 4 hours; then dry after the second wet ball mill for 6 hours, add 9% The polyvinyl alcohol is granulated, sintered at 1450°C after molding, and kept for 4 hours; finally, the performance parameter test is carried out.

[0043] Apparent Density ρ of Materials Tested by Drainage Method app , using a magnetic ring scale to measure the specifi...

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Abstract

The invention discloses a garnet ferrite material with low magnetic moment, small loss and high temperature stability, which belongs to the field of microwave technology and magnetic materials, and its chemical formula is Y 3‑m‑n‑(a+2x+y) Ca a+2x+ y Gd m Nd n sn a In b Ni c V x Ge c+y Al z Fe 5‑a‑b‑c‑x‑(c+y)‑z‑δ o 12 , where: 0.5≤m≤0.8; 0.01≤n≤0.05; 0≤a≤0.4; 0≤b≤0.4; 0≤c≤0.02; 0.1≤x≤0.5; 0.1≤y≤0.5; ; δ is the amount of iron deficiency, 0.05≤δ≤0.2, the saturation magnetization Ms of the garnet ferrite material of the present invention is lower than 24kA / m, and the Curie temperature T c >160℃, temperature coefficient (10 ‑3 / °C,‑55°C~+80°C)<3, ferromagnetic resonance linewidth ΔH<4kA / m, with remarkable small loss, low saturation magnetization, high temperature stability and other characteristics.

Description

technical field [0001] The invention relates to the fields of microwave technology and magnetic materials, in particular to a garnet ferrite material with low magnetic moment, small loss and high temperature stability. Background technique [0002] The L-band is lower than the design frequency of most stealth aircraft / unmanned aircraft, and is the main frequency of long-range search radar. As a key functional material used in L-band ferrite devices, garnet ferrite materials need to have small loss, Low saturation magnetization, high temperature stability and other characteristics. [0003] The currently published research on low magnetic moment and high temperature stability shows that Hu Guoguang of Anhui University used a small amount of Mn on the basis of YGdCaVInIG 3+ Doped, the saturation magnetization is about 40kA / m, T c >180°C garnet material; Weng Zhaoping of Nanjing Institute of Electronic Technology obtained the lowest saturation magnetization of 46.17kA / m th...

Claims

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Application Information

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Patent Type & AuthorityPatents(China)
IPC IPC(8): H01F1/34C04B35/40
Inventor杨菲袁红兰任仕晶廖杨鲜聪
OwnerSOUTHWEST INST OF APPLIED MAGNETICS