Tel: +86-18573485932
E-mail: sales@tlmagnet.com
Blistering in customized neodymium block magnets and how to prevent it
Bubbles appear in customized neodymium block magnets after use, which affects the use of magnets and is often confusing. It depends on how it occurs and how to prevent it.
Bubbles appear in customized neodymium block magnets after use, which affects the use of magnets and is often confusing. It depends on how it occurs and how to prevent it.
The water content of the blank, the uniform particle size of the ball mill, the pre-sintering, sintering temperature, and the atmosphere of the sintering furnace have a great influence on the foaming rate of the magnet. Incomplete transpiration of moisture at the base of the blank will also result in an increase in the foaming rate of customized neodymium block magnets. 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 released from the mold, the customized neodymium block magnets will simply foam. This is because the initial surface moisture transpiration speed of the blank is faster than the internal moisture dispersion speed. As time goes on, the surface moisture content decreases, and the difference between the inner and outer moisture content of the blank increases. If there is residual closed water at the base of the blank, Foams at high temperatures. If the difference between the inner and outer moisture content of the blank is gradually reduced, the blistering is also gradually reduced.
②In the secondary 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 customized neodymium block magnets.
③During sintering, there is no foaming below a certain sintering temperature. This temperature is called the critical temperature of foaming. Beyond this temperature, the foaming rate will gradually increase with the progress of the sintering temperature. With the increase of the pre-burning temperature, the critical temperature of foaming also increases.
④Another reason for bubbling is that after the pre-sintered material is mixed with iron by crushing and grinding to form Fe2O3, it will be differentiated according to the reaction formula of 6Fe203 = 4Fe304 + O22Fe2O3 = 4FeO + O2 during sintering. When Fe2O3 is violently reduced to FeO, if the differentiated O2 cannot be discharged, it will also cause bubbling of the blank.
⑤Sintering furnace with good ventilation, its magnets are also prone to bubbles.
The main solutions include: prolonging the drying time of customized neodymium block magnets blanks, appropriately increasing the temperature of the pre-sintered material, the uniform particle size of ball milling, 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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