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MnZn ferrite material with low magnetic noise and large-size preparation method thereof
The invention relates to the technical field of ferrite materials, in particular to a low-magnetic-noise MnZn ferrite material and a large-size preparation method thereof, and the low-magnetic-noise MnZn ferrite material comprises main component raw materials and dopants; the main component raw materials comprise amol% of Fe2O3, bmol% of MnO and 20 mol% of ZnO, and the Fe2O3 accounts for 47-55 mol%; the dopant comprises Co2O3 accounting for 2500 to 7000 ppm of the weight of the main component raw materials, CaCO3 accounting for 200 to 400 ppm of the weight of the main component raw materials, SiO2 accounting for 100 to 200 ppm of the weight of the main component raw materials and ZrO2 accounting for 50 to 200 ppm of the weight of The MnZn ferrite material has high magnetic conductivity and high resistivity, is favorable for reducing magnetic noise of extremely weak magnetic shielding, is granulated by controlling the particle size of pre-sintered powder and spray drying, controls the volume average particle size of granulated powder to be 30.18-40.55 mu m, is pressed into a green body under the pressure of 200-250Mpa and the holding time of 15 minutes, and is subjected to degumming and sintering processes, so that the magnetic noise of extremely weak magnetic shielding can be reduced. After the blank is processed, large-size MnZn ferrite sheets can be obtained and can be spliced to form a magnetic shielding bin, and a magnetic noise result in the shielding bin shows that the magnetic noise level under an extremely weak magnetic field is remarkably reduced.
本申请涉及铁氧体材料技术领域，具体涉及一种低磁噪声的MnZn铁氧体材料及其大尺寸制备方法，包括主成分原料及掺杂物；主成分原料包括amol%的Fe2O3、bmol%的MnO和20mol%的ZnO，其中，Fe2O3占47～55mol%；掺杂物包括占主成分原料重量2500～7000ppm的Co2O3、200～400ppm的CaCO3、100～200ppm的SiO2及50～200ppm的ZrO2；本MnZn铁氧体材料具有高磁导率和高电阻率，有利于降低极弱磁屏蔽的磁噪声，通过控制预烧粉料粒度、喷雾干燥进行造粒，控制造粒粉体积平均粒径为30.18~40.55um，在200Mpa~250Mpa压力、15min的保压时间下，压制成生坯，经过脱胶和烧结工艺后，毛坯加工后可以获得大尺寸的MnZn铁氧体片，并可以拼接形成磁屏蔽仓，屏蔽仓内的磁噪声结果显示其显著降低了极弱磁场下的磁噪声水平。
MnZn ferrite material with low magnetic noise and large-size preparation method thereof
The invention relates to the technical field of ferrite materials, in particular to a low-magnetic-noise MnZn ferrite material and a large-size preparation method thereof, and the low-magnetic-noise MnZn ferrite material comprises main component raw materials and dopants; the main component raw materials comprise amol% of Fe2O3, bmol% of MnO and 20 mol% of ZnO, and the Fe2O3 accounts for 47-55 mol%; the dopant comprises Co2O3 accounting for 2500 to 7000 ppm of the weight of the main component raw materials, CaCO3 accounting for 200 to 400 ppm of the weight of the main component raw materials, SiO2 accounting for 100 to 200 ppm of the weight of the main component raw materials and ZrO2 accounting for 50 to 200 ppm of the weight of The MnZn ferrite material has high magnetic conductivity and high resistivity, is favorable for reducing magnetic noise of extremely weak magnetic shielding, is granulated by controlling the particle size of pre-sintered powder and spray drying, controls the volume average particle size of granulated powder to be 30.18-40.55 mu m, is pressed into a green body under the pressure of 200-250Mpa and the holding time of 15 minutes, and is subjected to degumming and sintering processes, so that the magnetic noise of extremely weak magnetic shielding can be reduced. After the blank is processed, large-size MnZn ferrite sheets can be obtained and can be spliced to form a magnetic shielding bin, and a magnetic noise result in the shielding bin shows that the magnetic noise level under an extremely weak magnetic field is remarkably reduced.
本申请涉及铁氧体材料技术领域，具体涉及一种低磁噪声的MnZn铁氧体材料及其大尺寸制备方法，包括主成分原料及掺杂物；主成分原料包括amol%的Fe2O3、bmol%的MnO和20mol%的ZnO，其中，Fe2O3占47～55mol%；掺杂物包括占主成分原料重量2500～7000ppm的Co2O3、200～400ppm的CaCO3、100～200ppm的SiO2及50～200ppm的ZrO2；本MnZn铁氧体材料具有高磁导率和高电阻率，有利于降低极弱磁屏蔽的磁噪声，通过控制预烧粉料粒度、喷雾干燥进行造粒，控制造粒粉体积平均粒径为30.18~40.55um，在200Mpa~250Mpa压力、15min的保压时间下，压制成生坯，经过脱胶和烧结工艺后，毛坯加工后可以获得大尺寸的MnZn铁氧体片，并可以拼接形成磁屏蔽仓，屏蔽仓内的磁噪声结果显示其显著降低了极弱磁场下的磁噪声水平。
MnZn ferrite material with low magnetic noise and large-size preparation method thereof
一种低磁噪声的MnZn铁氧体材料及其大尺寸制备方法
WANG FANGFANG (author) / GAO MING (author) / ZHANG HU (author)
2024-10-18
Patent
Electronic Resource
Chinese
MnZn-BASED FERRITE AND MnZn-BASED FERRITE LARGE SIZE CORE
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