A kind of low-temperature rapid sintering soft ferrite and its preparation method

Abstract

The invention discloses low-temperature rapidly sintered soft magnetic ferrite and a preparation method thereof. The preparation method comprises the following steps: S1, weighing the following components in parts by mole: 60-80 parts of ferric oxide, 40-60 parts of zinc oxide, 30-50 parts of copper oxide and 15-20 parts of manganese carbonate, and performing mixing ball-milling till the average particle size is 5-30 [mu]m so as to obtain mixed powder; S2, pre-sintering the mixed powder at 900-1000 DEG C so as to obtain a pre-sintered material; S3, weighing yttrium oxide, aluminum oxide and lithium carbonate as doping materials; S4, adding the doping materials weighed in the step S3 into the pre-sintered material, performing secondary ball-milling for 6-8 hours, drying, adding polyvinyl alcohol, and performing pelletizing so as to obtain a granular material; S5, heating the granular material to sintering temperature in the presence of an air atmosphere, and performing warm-keeping sintering, thereby obtaining the low-temperature rapidly sintered soft magnetic ferrite, wherein the sintering temperature meets the equation that T=1454 / [1g(X+2Y+Z)+t]. Due to mutual cooperation of the main material and the doping materials, a preparation process is optimized, the sintering temperature is reduced, and meanwhile the electromagnetic properties of the ferrite are ensured.

Description

technical field

[0001] The invention relates to the technical field of soft ferrite, in particular to a low-temperature rapid sintering soft ferrite and a preparation method thereof. Background technique

[0002] Ferrite is generally used as a magnetic medium material in application. It is obtained by composite oxidation of iron and one or more other corresponding metal elements, so it was also called ferrite oxide in the early days. . Since the 1930s, Japan, Germany and other countries have carried out very systematic research and production of ferrite, and the development is very rapid. Now it has been realized in many fields such as radio, communication, radar navigation, space flight, and automatic control. very widely used.

[0003] Soft magnetic manganese zinc ferrite has the characteristics of high magnetic permeability, high resistivity, low Curie temperature, low high-frequency loss and high saturation magnetic induction intensity, and is often used in various ele...