Method for flattening magnetic metal powder by rolling
A magnetic metal powder, flattening technology, applied in the field of magnetic metal powder calendering and flattening processing, can solve the problems of reducing the flattening rate, flake breakage, etc., and achieve the effect of avoiding group movement, improving the ratio and production efficiency
Active Publication Date: 2017-11-28
江苏宝纳电磁新材料有限公司
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Problems solved by technology
In the late stage of flattening, the shear force helps to reduce the thickness of the flake powder, but when the impact force exceeds the capacity of the flake, it may cause the flake to break, thereby reducing the flattening rate
Method used
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Embodiment 1
[0030] The commercially available 400-mesh permalloy powder produced by the aerosol method is used as the raw material, and has been rolled and stamped in the previous process. The scanning electron microscope photo of the initially flattened powder is shown in Figure 6 .
[0031] Ethanol is used as the dispersion medium, the volume ratio of the dispersion medium to the alloy powder is 6:1, and the amount of antirust and lubricant is 0.2% (mass ratio) of the metal powder. Using Ф80mm, Ф30mm and Ф12mm rollers, the quantity ratio of large, medium and small rods is about 20:5:1, and the ratio of rollers to alloy powder is 10:1 (mass ratio). The linear speed of the inner wall of the rod mill was 200 m / min. After continuous rolling for 30 hours, samples were taken. The scanning electron microscope pictures of the samples are shown in Figure 7 .
[0032] Immediately afterwards, rod milling is continued with a small rod. The volume ratio of dispersion medium to alloy powder is...
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Abstract
A method for calendering and flattening of magnetic metal powder, the method for calendering and flattening is as follows: the preliminarily flattened magnetic metal powder is extruded with each other under the action of rolling force and shearing force of a roller bar through a rod milling method , the powder is forced to undergo a paradigmatic deformation, and the dimension in the thickness direction is reduced due to extrusion and shearing, and the particles are forced to extend in the direction of length and width; multiple layers of rollers are stacked in the rod mill barrel, and when the inner wall of the mill barrel rotates , under the dual action of gravity and friction, the rollers of each layer are driven to rotate in turn to form the rolling and shearing of the magnetic metal powder, so as to realize the method of rolling the powder. Beneficial effects: the present invention adopts rolling and calendering methods, and the force exerted by the roller on the powder is only rolling force and shearing force, rather than impact force. No matter it is rolling force or shearing force, the powder can be rolled The function can avoid the group movement and impact phenomenon similar to that in the high-energy ball mill, and improve the proportion of powder flattening and production efficiency.
Description
technical field [0001] The invention relates to a method for calendering and flattening of magnetic metal powder. The scaly metal soft magnetic micropowder produced by the method is mainly used as a magnetic raw material for making a flexible electromagnetic interference wave absorbing magnetic sheet. The flexible magnetic sheet is preferably used in RFID (radio frequency) Identification: Radio Frequency Identification) electronic tags and EMC (Electromagnetic Compatibility: Electromagnetic Compatibility or EMI is anti-electromagnetic interference: Electromagnetic Interference) and so on. Background technique [0002] In recent years, there has been an upsurge of the Internet of Things in the world. The Internet of Things is an emerging high-tech industry, a new growth point of the world economy, and a new industry 30 times larger than Internet sales. The Internet of Things (IoT) combines various information sensing devices, such as radio frequency identification (RFID) dev...
Claims
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IPC IPC(8): B22F1/00B22F3/20B22F3/18
Inventor 阳开新戴少银瞿卫俊
Owner 江苏宝纳电磁新材料有限公司