Mn-Zn ferrite material and its production tech.

Abstract

A Mn-Zn ferrite with low power consumption and high saturated magnetic flux density is prepared from iron oxide, zinc oxide, manganese oxide, calcium oxide, niobium oxide and titanium oxide through proportional mixing, ball grinding, vibration grinding, pre-calcining, sand grinding, granulating, shaping, sintering and grinding.

Description

technical field [0001] The invention relates to the technical field of ferrite materials, in particular to a Mn-Zn ferrite material with low power consumption and high saturation magnetic induction and a production process thereof. Background technique [0002] With the development of science and technology, people's living standards are improved, cars and computers are used more and more frequently, and families with cars are also rising sharply. The demand for magnetic core materials for automotive transformer coil products is great, and the requirements are gradually increasing. In order to To make it work under severe temperature conditions such as external temperature changes and engine room heating, it is required to maintain a high saturation magnetic flux density under high temperature conditions. Similarly, in order to be used under the high heating temperature conditions of liquid crystal displays, it is also required to maintain a high saturation magnetic flux den...

AI Technical Summary

Problems solved by technology

For the MnZn ferrite material described in Chinese patent application 03115906.0, the Bs at 25°C reaches 520mT, but the Pcv at 100°C is 370kW / m 3 About, there is no power consumption value at 45-55°C

For the MnZn ferrite material described in Chinese patent application 03125523.x, the Pcv at 100°C is 280kW / m 3 around, but Bs and μ are not stated i The characteristics of magnetic parameters such as low Pcv alone cannot meet the requirements of miniaturization of devices

The material described in Chinese patent application 01112082.7, although the Pcv can be 230-260kW / m 3 between, but does not specify Bs and μ I Characteristics of other magnetic parameters

[0004] Chinese patent application 93114870.7 describes a method of improving the magnetic parameters such as magnetic permeability and Bs by finely grinding the sintered body, but it failed to achieve the ideal index after all, and the production cost was increased due to the long time of fine grinding , reducing production efficiency

For the MnZn ferrite described in Chinese patent application 02138280.8, although the Pcv drops to 240-260kW / m at 100°C 3 , Bs at 100°C reaches 410-430mT, but in this invention due to the addition of nano-scale Nb 2 o 5 、 Ta 2 o 5 , ZrO 2 , SnO 2 、TiO 2 , CaO and other auxiliary components increase the overall cost

This makes it difficult to realize large-scale industrial production, and limits the use of the ferrite

Although the Japanese patent application JP 2003-306376A discloses that the composition is similar to the composition of the present invention, but it contains a relatively high proportion of ZnO, resulting in that the high-temperature use properties of the ferrite cannot meet the needs