Method for preparing thermo-sensitive magnetic core with stable electromagnetic characteristic

A technology with electromagnetic characteristics and stability, applied in the direction of thermal switch components, circuits, electrical switches, etc., can solve the problems of volatile, low product qualification rate, unstable electromagnetic characteristics, etc., to achieve refined grains and qualified products. High rate, reducing the effect of Curie temperature fluctuations

Active Publication Date: 2019-03-26
岳西县鸿腾电子有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, this magnetic core needs a higher sintering temperature in the blank sintering process, and its sintering temperature is 1200-1240 ° C. Due to the high sintering temperature, Zn in the crystal structure 2+ Volatile, resulting in the instability of its electromagnetic properties, the product qualification rate is less than 75%

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] A method for preparing a heat-sensitive magnetic core with stable electromagnetic properties, comprising the following steps: mixing 40kg of iron oxide, 18kg of zinc oxide, 2kg of bismuth oxide, and 10kg of aluminum oxide, adding 1kg of glycerin, 12kg of 12wt% ethanol aqueous solution and grinding for 12 minutes, grinding The pressure is 0.04MPa, add 2kg polyethylene glycol and continue grinding for 1min, rolling, under the protection of nitrogen, the temperature is raised from room temperature to 320°C at a rate of 2°C / min, pre-fired for 3 hours, and then heated to 820°C at a rate of 2.3°C / min ℃, sintered for 1h, cooled to room temperature with the furnace, and ground to obtain a heat-sensitive magnetic core with stable electromagnetic properties, smooth surface, no burrs, no particles, no water traces.

Embodiment 2

[0017] A method for preparing a heat-sensitive magnetic core with stable electromagnetic properties, comprising the steps of: mixing 100 kg of iron oxide, 10 kg of zinc oxide, 10 kg of bismuth oxide, and 1 kg of aluminum oxide, adding 2 kg of glycerin, and grinding 4 kg of 30 wt % ethanol aqueous solution for 4 minutes, grinding The pressure is 0.08MPa, add 1kg of polyethylene glycol and continue grinding for 2min, rolling, under the protection of nitrogen, the temperature is raised from room temperature to 400°C at a rate of 1°C / min, pre-fired for 1h, and then heated to 700°C at a rate of 3°C / min ℃, sintered for 4 hours, cooled to room temperature with the furnace, and ground to obtain a heat-sensitive magnetic core with stable electromagnetic properties, smooth surface, no burr, no particle impurities, and no water trace.

Embodiment 3

[0019] A method for preparing a heat-sensitive magnetic core with stable electromagnetic properties, comprising the following steps: mixing 60 kg of iron oxide, 16 kg of zinc oxide, 4 kg of bismuth oxide, and 8 kg of aluminum oxide, adding 1.3 kg of glycerin, and 10 kg of 18 wt% ethanol aqueous solution to grind for 10 min, Grinding pressure is 0.05MPa, add 1.7kg of polyethylene glycol to continue grinding for 1.4min, rolling, under the protection of nitrogen from room temperature at a rate of 1.7°C / min to 340°C, pre-calcined for 2.5h, and then at a rate of 2.4°C / min The temperature is raised to 800°C, sintered for 2 hours, cooled to room temperature with the furnace, and ground to obtain a heat-sensitive magnetic core with stable electromagnetic properties, smooth surface, no burr, no particle impurities, and no water trace.

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Abstract

The invention discloses a method for preparing a thermo-sensitive magnetic core with the stable electromagnetic characteristic. The method comprises the following steps: mixing iron oxide, zinc oxide,bismuth oxide and aluminum oxide; adding glycerin and an ethanol aqueous solution and carrying out grinding; adding polyethylene glycol and carrying out grinding continuously; and carrying out rolling; rising the temperature under protection of nitrogen, carrying out pre burning, rising the temperature, carrying out sintering, carrying out cooling, and carrying out grinding to obtain a thermo-sensitive magnetic core having characteristics of smooth surface, burr-free, particle impurity-free, and water-mark-free effects, and stable electromagnetic characteristic. According to the preparation method, on the basis of combination of pre burning with sintering, the volatilization of Zn2+ in the system is reduced effectively; effective fixation in a crystal lattice is realized; a fine crystal structure similar to the Ni-Zn ferrite is formed; the crystal grains are refined; the sintering temperature is reduced; the Curie temperature fluctuation of the magnetic core is reduced; the electromagnetic characteristic is stable; and the product yield reaches over 90%.

Description

technical field [0001] The invention relates to the technical field of heat-sensitive magnetic cores, in particular to a method for preparing a heat-sensitive magnetic core with stable electromagnetic properties. Background technique [0002] At present, thermal magnetic cores are widely used in magnetic thermal protection switches of household appliances with a wide temperature control range, such as rice cookers and electric water heaters. The temperature-sensitive magnetic core material is generally made of Mg-Cu-Zn ferrite high-conductivity material. The magnetic permeability μi of this material is 1000-1350, and the fluctuation range of Curie temperature Tc of this material is 90°C-100°C. [0003] However, this magnetic core needs a higher sintering temperature in the blank sintering process, and its sintering temperature is 1200-1240 ° C. Due to the high sintering temperature, Zn in the crystal structure 2+ Volatile, resulting in the instability of its electromagnetic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01H11/00H01H37/58
CPCH01H11/00H01H37/58
Inventor 项辉
Owner 岳西县鸿腾电子有限公司
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