Tel: +86-18573485932
E-mail: sales@tlmagnet.com
The disc magnet manufacturer tells you the phenomenon of magnet blistering and how to prevent it
The disc magnet blisters after use, which affects the use of the magnet, which often confuses people, depending on how it is produced and how to prevent it.
The disc magnet blisters after use, which affects the use of the magnet, which often confuses people, depending on how it is produced and how to prevent it.
The water content of the disc magnet blank, the uniform particle size of the ball mill, the pre-sintering and sintering temperature, and the atmosphere of the sintering furnace have a great influence on the foaming rate of the disc magnet. The moisture in the base of the blank does not completely evaporate, which will also result in an increase in the foaming rate of the magnet. The specific comments are as follows:
①If the difference between the inner and outer moisture content of the blank is relatively large after the blank is ejected from the mold, the disc magnet simply blisters. This is because the initial surface water transpiration rate of the blank is faster than the internal water dispersion speed. With the passage of time, its surface moisture content decreases, and the difference between the internal and external moisture content of the blank increases. If there is residual shut-off water at the base of the blank, It will foam at high temperatures. If the difference between the inner and outer moisture content of the blank is gradually reduced, the blistering is gradually reduced.
②In the second fine grinding, the larger the particle size, the easier the dispersion of the inner and outer capillary water, and the smaller the foaming rate of the magnet.
③During sintering, there is no blistering below a certain sintering temperature. This temperature is called the blistering critical temperature. Beyond this temperature, the bubbling rate will gradually increase with the progress of the sintering temperature. As the burn-in temperature increases, so does the foaming critical temperature.
④Another reason for bubbling is that after the pre-fired material is crushed, ground and mixed with iron to produce Fe2O3 in the crushing technology, it will be sintered according to the reaction formula of 6Fe203 = 4Fe304 + O22Fe2O3 = 4FeO + O2. When Fe2O3 is violently reduced to FeO, if the differentiated O2 cannot be discharged, the blank will also bubble.
⑤The sintering furnace with good ventilation, its disc magnet is also prone to blisters.
The main solutions for disc magnet foaming are: extending the drying time of the blank, appropriately increasing the temperature of the pre-fired material, the uniform particle size of the ball mill, and reducing the secondary sintering temperature, etc.
Tongli Magnetic Industry Co., Ltd.
Address：No. 5, Changfu Road, Ludong community, Humen Town, Dongguan City, Guangdong Province.
Contact:：kiara
Tel: +86-18573485932
E-mail: sales@tlmagnet.com
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