Preparation method of cobalt ferrite magnetostrictive material

A technology of magnetostrictive materials, cobalt ferrite, applied in the field of preparation of cobalt ferrite magnetostrictive materials, can solve the problems such as cobalt ferrite magnetostrictive materials that have not yet been seen, and achieve the reduction of magnetostrictive excitation field , cost reduction, and the effect of low magnetostrictive excitation field

Active Publication Date: 2015-04-08
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] So far, there has been no report on the preparation of cobalt ferrite magnetostrictive materials by hot isostatic pressing process

Method used

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  • Preparation method of cobalt ferrite magnetostrictive material
  • Preparation method of cobalt ferrite magnetostrictive material
  • Preparation method of cobalt ferrite magnetostrictive material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] This embodiment provides a cobalt ferrite CFO1, which specifically includes the following steps:

[0027] 1) Prepare cobalt oxide and iron oxide according to the atomic ratio Co:Fe=1:2, put them into a ball mill, and mix at 400r / min for 10h to obtain a uniformly mixed powder, pass through a 100-mesh sieve, and the final powder particle size is 100-200μm;

[0028] 2) The powder is formed by unidirectional compression molding, the pressing pressure is 500MPa, and the pressure is kept for 30s to obtain a prefabricated green body;

[0029] 3) Carry out atmospheric pressure sintering on the prefabricated green body, the sintering temperature is 1350 ℃, keep warm for 10 hours, and obtain the preliminary densified sample;

[0030] 4) Hot isostatic sintering is performed on the preliminary densified sample, the pressurized medium is argon, the sintering temperature is 1100° C., the pressure is 150 MPa, and the pressure is maintained for 3 hours to obtain a densified sample.

...

Embodiment 2

[0033] The present embodiment provides a kind of cobalt ferrite CFO2, specifically comprises the following steps:

[0034] 1) Prepare cobalt oxide and iron oxide according to the atomic ratio Co:Fe=1:2, put them into a ball mill, and mix at 400r / min for 10h to obtain a uniformly mixed powder, pass through a 100-mesh sieve, and the final powder particle size is 100-200μm;

[0035] 2) The powder is formed by unidirectional compression molding, the pressing pressure is 100MPa, and the pressure is maintained for 30s to obtain a prefabricated green body;

[0036] 3) Carry out atmospheric pressure sintering on the prefabricated green body, the sintering temperature is 1350 ℃, keep warm for 10 hours, and obtain the preliminary densified sample;

[0037] 4) Hot isostatic sintering is performed on the preliminary densified sample, the pressurized medium is argon, the sintering temperature is 1100° C., the pressure is 150 MPa, and the pressure is maintained for 3 hours to obtain a densi...

Embodiment 3

[0040] The present embodiment provides a kind of cobalt ferrite CFO3, specifically comprises the following steps:

[0041] 1) Prepare cobalt oxide and iron oxide according to the atomic ratio Co:Fe=1:2, put them into a ball mill, and mix at 600r / min for 10h to obtain a uniformly mixed powder, pass through a 100-mesh sieve, and the final powder particle size is 100-200μm;

[0042] 2) The powder is formed by cold isostatic pressing, and a rubber sleeve is used as a mold for forming, and the pressing pressure is 150 MPa, and the pressure is maintained for 15 minutes to obtain a prefabricated green body;

[0043] 3) Carry out atmospheric pressure sintering on the prefabricated green body, the sintering temperature is 1350 ℃, keep warm for 10 hours, and obtain the preliminary densified sample;

[0044] 4) Hot isostatic sintering is carried out on the pre-densified sample, the pressurized medium is argon, the sintering temperature is 1200° C., the pressure is 150 MPa, and the pressure...

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Abstract

The invention relates to a preparation method of a cobalt ferrite magnetostrictive material, which relates to a process in which hot isostatic pressure sintering is carried out on sintered cobalt ferrite to obtain a sample with high density, high magnetostriction coefficient and low magnetostrictive exciting field. The process comprises the following steps: preparation of raw material powder, pressure forming of powder and bland sintering, hot isostatic pressure sintering and thermal treatment. A sample of a cobalt ferrite ceramic material prepared by using the preparation method has the advantages that internal pores are reduced greatly and the density is higher than 99%; the absolute value of parallel magnetostriction coefficient is higher than 150ppm; the magnetostrictive exciting field is lower than 2000Oe. Since hot isostatic pressure sintering treatment is carried out on the cobalt ferrite magnetostrictive material, the application of the cobalt ferrite magnetostrictive material to a low-field high-frequency magnetostriction field is promoted and an important reference is also provided for the preparation of other functional ceramic materials.

Description

technical field [0001] The invention relates to a preparation method of a cobalt ferrite magnetostrictive material, that is, sintering sintered cobalt ferrite by hot isostatic pressing to obtain high density, higher magnetostriction coefficient and lower magnetostriction Incentive field product craftsmanship. Background technique [0002] Cobalt ferrite magnetostrictive material has many advantages such as high resistivity, high environmental stability and low price. It is suitable for high-frequency magnetic stress sensors, core components of underwater acoustic and high-power ultrasonic transducers, and micro-drives for precision instruments. parts etc. [0003] When the excitation field of polycrystalline cobalt ferrite reaches 4000Oe, the absolute value of the magnetostriction coefficient in the parallel direction can reach 150ppm, but it is difficult to achieve such a high excitation field in application, which restricts its application in many fields. At present, pol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/32C04B35/622
Inventor 高学绪王继全李纪恒包小倩
Owner UNIV OF SCI & TECH BEIJING
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