High-temperature high-Bs low-loss MnZn ferrite material and preparation method thereof

Abstract

The invention provides a high-temperature high-Bs low-loss MnZn ferrite material which comprises main components and auxiliary components, wherein the main components comprise 53mol%-56mol% of ferrite, 34mol%-42mol% of manganese oxide and 4mol%-10mol% of zinc oxide, wherein the content of manganese oxide is accounted by Mn; the auxiliary components are selected from at least four out of CaCO3, SiO2, Nb2O5, V2O5, CoO, NiO, Ni2O3 and Li2CO3, and based on the total weight of the main components, the weight percentage of the auxiliary components is as follows: 0.02-0.08wt% of CaCO3, 0.002-0.01wt% of SiO2, 0.02-0.06 wt% of Nb2O5, 0.01-0.05wt% of V2O5, 0.03-0.20wt% of CoO, 0.03-0.20wt% of NiO, 0.03-0.14wt% of Ni2O3, and 0.01-0.10wt% of Li2CO3. The invention also provides a preparation method of the high-temperature high-Bs low-loss MnZn ferrite material.

Description

technical field [0001] The invention relates to a MnZn ferrite material and a manufacturing method thereof, and in particular to a high-temperature, high-Bs, low-loss MnZn ferrite material and a manufacturing method thereof. Background technique [0002] With the improvement of people's living standards, the requirements for quality of life are getting higher and higher, and various research departments are vigorously developing non-polluting electric vehicles. Electronic components used in electric vehicles are required not only to have high efficiency, small size, and light weight, but also to have high reliability under harsh working environments. Taking the ferrite core as an automobile charging transformer as an example, it is not only required to have a high saturation magnetic flux density, but also a low power loss. At the same time, because the core temperature rises due to the heat generated during the high-current charging process, it is also desired that the mat...

AI Technical Summary

Problems solved by technology

With the increase of the sintered crystal grains, the sintered density of the ferrite material increases, and the Bs of the material increases accordingly, but the eddy current loss of the material is proportional to the square of the grain diameter, and the increase of the grain size will directly lead to the work of the material. consumption increase problem

[0008] Many workers have been researching high-Bs and low-loss MnZn ferrite materials. The existing high-Bs and low-loss MnZn ferrite materials can reach 540mT and 450mT under the conditions of 25°C, 100°C, and 1200A / m respectively. , but due to too much iron oxide in the main component, the second peak of the material shifts to normal temperature, and the loss under the conditions of 100°C, 100kHz, and 200mT is mostly 650kW / m 3 Above, in actual application, the energy consumption is high, and it is easy to generate heat during the working process, or even burn out, which lacks practical value.

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