Method for quick sintering of micro-crystal ferrite magnetic core part
A ferrite core, rapid sintering technology, applied in the direction of magnetic materials, magnetic objects, electrical components, etc., can solve the problem of large sintering shrinkage
Inactive Publication Date: 2008-09-17
SHANGHAI UNIV
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Problems solved by technology
In order to complete the sintering reaction of the material and ensure that the sintered material has a certain microstructure, that is, a microstructure with large, uniform particles, single phase and high density, the use of SPS sintering equipment is the most ideal choice; in addition, A large number of soft magnetic materials are used as inductance elements or transformer cores. Their common application shapes are ring-shaped, E-shaped, U-shaped, etc. The standard material measurement also uses ring-shaped samples, but generally SPS sintering uses cylindrical molds , the sintered samples are round cakes or cylinders; due to the large sintering shrinkage of ferrite materials, they cannot be sintered directly with ring molds
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Embodiment 1
[0021] By oxide mole percentage: Fe 2 o 3 54.07mol%, MnO 39mol%, ZnO 7.04mol% to carry out batching, prepare 150 grams of manganese zinc ferrite. The amount of raw materials required to convert the above oxides into nitrates. Using Zn(NO) with a chemical purity of 99% 3 ) 2 ·6H 2 O 35.24 g, 98% pure Fe(NO 3 ) 3 9H 2 O 550.27 g with a concentration of 50% Mn(NO 3 ) 2 114.33ml (i.e. 85.41 grams), with the purity of nitrate equimolar ratio is 99% citric acid (CH 8 O7·H 2 O) 408.61 grams, respectively configured into an aqueous solution with 400ml of deionized water; fix the wide-mouth cup container in a thermostat, and control the temperature at 60°C; slowly pour the existing solutions into the wide-mouth cup in order, and stir at a constant temperature , to make it fully and evenly mixed; while stirring, use a dropper to drop ethylenediamine to adjust the pH value of the solution to 6.5; after the reaction, a wet gel is obtained; put the wet gel solution directly on ...
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Abstract
The invention relates to a method for using a system of plasma sintering (SPS) to rapidly sinter a microcrystal ferrite magnetic core device at low temperature, belonging to the procedure technical field for preparing the magnetic ferrite device. The method of the invention uses nitrate-citric acid sol-gel method to prepare manganese-zinc ferrite magnetic powder whose grain size is 20 to 60 nm; the used nitrate is represented by mol percents of metal oxides which are: 52 to 55 mol% Fe<2>O<3>, 34-40 mol% MnO, 6-11% ZnO; the mol ratio of total quantities of the nitrate and citric acid is 1:1. The powder is sintered between 900 to 1350 DEG C, and preserved the heat for 1 to 5 hours after extracting vacuum, then cooled in the furnace to obtain the powder of micrometer grains; after than, the powder is performed PVA rubberization, stirred, granulated and pressed to form a blank; then the blank in a certain shape is placed within the system of plasma sintering to pressurize in the vacuum and sinter; eventually, the microcrystal manganese-zinc ferrite magnetic core device in a certain shape is formed. The test represents that the device includes 104 magnetic conductivity and 12 MHz cut-off frequency, belonging to the high frequency ferrite soft magnetic material.
Description
technical field [0001] The invention relates to a method for rapidly sintering a microcrystalline ferrite magnetic core device using a plasma sintering device (SPS) at a low temperature, and belongs to the technical field of magnetic ferrite device preparation technology. Background technique [0002] With the development of miniaturization and low power consumption of microelectronic devices, corresponding requirements are put forward for magnetic electronic devices, which are widely used in the field of modern information technology. loss direction. Ferrite magnetism with spinel (AB204) structure, as a multi-component composite metal oxide sintered body, has always played an important role in the high-frequency application field of magnetoelectronics. Under the circumstances that the electronics and information industry have increasingly high requirements for miniaturization, integration and modularization of products, in addition to the requirements on the magnetic prope...
Claims
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IPC IPC(8): H01F1/10H01F1/113C04B35/26C04B35/624
Inventor 郁黎明张建花袁淑娟曹世勋张金仓
Owner SHANGHAI UNIV