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LiZn ferrite material with low coercive force

A ferrite material and low coercivity technology, applied in the field of ferrite materials, can solve the problems affecting the performance of microwave phase shifters, the consistency of amplitude and phase, the yield, the material utilization rate and processability are not ideal, the Li system The problem of high ferrite loss can achieve the effect of optimizing particle size and particle size distribution, small porosity, and short reaction time.

Inactive Publication Date: 2015-07-22
ANHUI HUALIN MAGNETIC TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the prior art, due to the high loss of Li-based ferrite and high solid-state reaction temperature, the utilization rate and processability of the material are not ideal, and at the same time, the performance, amplitude-phase consistency, and yield of the microwave phase shifter are affected.

Method used

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  • LiZn ferrite material with low coercive force

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] A low-coercivity LiZn ferrite material, weigh the raw materials according to the following ratio:

[0019] Fe 2 O 3 , ZnO, Li 2 CO 3 , Bi 2 O 3 , Mn 3 O 4 , Nb 2 O 5 , Polyvinyl alcohol, of which Fe 2 O 3 : ZnO: Li 2 CO 3 The molar ratio is 48:13:7, with Fe 2 O 3 , ZnO, Li 2 CO 3 The quality of the three is the benchmark, Bi 2 O 3 , Mn 3 O 4 , Nb 2 O 5 The mass fractions are 1.8%, 1.7%, 0.21%, respectively, with Fe 2 O 3 , ZnO, Li 2 CO 3 , Bi 2 O 3 , Mn 3 O 4 , Nb 2 O 5 Based on the sum of the six masses, the mass fraction of polyvinyl alcohol is 16%;

[0020] According to the above-mentioned ingredients, the low coercivity LiZn ferrite material is prepared according to the following steps:

[0021] S1: One ball milling: Fe 2 O 3 , ZnO, Li 2 CO 3 Put it into the ball mill and use the speed of 192r / min to perform mixed ball milling. After ball milling for 2 hours, it is dried and ready for use. The mass ratio of powder: water: ball is 1:1.2:3;

[0022] S2: Pre-burning: Put the po...

Embodiment 2

[0026] A low-coercivity LiZn ferrite material, weigh the raw materials according to the following ratio:

[0027] Fe 2 O 3 , ZnO, Li 2 CO 3 , Bi 2 O 3 , Mn 3 O 4 , Nb 2 O 5 , Polyvinyl alcohol, of which Fe 2 O 3 : ZnO: Li 2 CO 3 The molar ratio is 45:13:6, with Fe 2 O 3 , ZnO, Li 2 CO 3 The quality of the three is the benchmark, Bi 2 O 3 , Mn 3 O 4 , Nb 2 O 5 The mass fractions are 1.5%, 2%, 0.25%, respectively, with Fe 2 O 3 , ZnO, Li 2 CO 3 , Bi 2 O 3 , Mn 3 O 4 , Nb 2 O 5 Based on the sum of the six masses, the mass fraction of polyvinyl alcohol is 17%;

[0028] According to the above-mentioned ingredients, the low coercivity LiZn ferrite material is prepared according to the following steps:

[0029] S1: One ball milling: Fe 2 O 3 , ZnO, Li 2 CO 3 Put it into the ball mill and use the speed of 198r / min to perform mixed ball milling. After the ball milling for 1.5 hours, it is dried and ready for use. The mass ratio of powder: water: ball is 1:1.3:3.2;

[0030] S2: Pre-burning: Put ...

Embodiment 3

[0034] A low-coercivity LiZn ferrite material. Weigh the raw materials according to the following ratio:

[0035] Fe 2 O 3 , ZnO, Li 2 CO 3 , Bi 2 O 3 , Mn 3 O 4 , Nb 2 O 5 , Polyvinyl alcohol, of which Fe 2 O 3 : ZnO: Li 2 CO 3 The molar ratio is 47:11:8, with Fe 2 O 3 , ZnO, Li 2 CO 3 The quality of the three is the benchmark, Bi 2 O 3 , Mn 3 O 4 , Nb 2 O 5 The mass fractions are 2.2%, 1.5%, 0.15%, respectively, with Fe 2 O 3 , ZnO, Li 2 CO 3 , Bi 2 O 3 , Mn 3 O 4 , Nb 2 O 5 Based on the sum of the six masses, the mass fraction of polyvinyl alcohol is 14%;

[0036] According to the above-mentioned ingredients, the low coercivity LiZn ferrite material is prepared according to the following steps:

[0037] S1: One ball milling: Fe 2 O 3 , ZnO, Li 2 CO 3 Put it into a ball mill and use a speed of 190r / min to perform mixed ball milling. After ball milling for 2.5 hours, it will be dried and ready for use. The mass ratio of powder: water: ball is 1:1.1:2.8;

[0038] S2: Pre-burning: Put t...

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Abstract

The invention discloses a LiZn ferrite material with low coercive force, which comprises raw materials of Fe2O3, ZnO, Li2CO3, Bi2O3, Mn3O4, Nb2O5, and polyvinyl alcohol, wherein the mole ratio of Fe2O3 to ZnO to Li2CO3 is (45-50):(10-15):(6-8); the mass fractions of Bi2O3, Mn3O4, and Nb2O5 are 1.5-2.2%, 1.5-2%, and 0.15-0.25%, based on the mass sum of Fe2O3, ZnO, and Li2CO3; and the mass fraction of polyvinyl alcohol is 14-17% based on the mass sum of Fe2O3, ZnO, Li2CO3, Bi2O3, Mn3O4, and Nb2O5. The LiZn ferrite material with low coercive force is prepared through the following steps: first ball milling, pre-sintering, second ball milling, pelleting and moulding, and sintering.

Description

Technical field [0001] The invention belongs to the technical field of ferrite materials, and particularly relates to a low-coercivity LiZn ferrite material. Background technique [0002] Li ferrite has the advantage of high Curie temperature. Therefore, its temperature stability is good. At the same time, the ratio of its magnetostriction coefficient to the magnetocrystalline anisotropy constant is also low. The hysteresis loop is rectangular and the remanence Low sensitivity to stress, compared to other gyromagnetic materials, it has a good advantage in microwave phase shifters. In the prior art, due to the high loss of Li-based ferrite and the high solid-phase reaction temperature, the utilization rate and processability of the material are not ideal, and at the same time, it affects the performance, amplitude and phase consistency and yield of the microwave phase shifter. . Therefore, it is necessary to improve the composition and preparation process of Li ferrite. Summary...

Claims

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Application Information

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IPC IPC(8): C04B35/26C04B35/622
Inventor 沈宏江
Owner ANHUI HUALIN MAGNETIC TECH
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