Process for preparing nm-class powder
A nano-scale and powder technology is applied in the field of grinding nano-scale fine-grained materials, which can solve the problems of high cost, low efficiency and difficulty, and achieve the effects of avoiding secondary pollution, advanced technology and moderate equipment investment.
Inactive Publication Date: 2001-12-26
李西根
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Problems solved by technology
[0003] The purpose of the present invention is to overcome the disadvantages of high cost, low efficiency, and great difficulty in the prior art, and provide a high-efficiency, low-cost, and easy-to-implement nanoscale powder preparation method
Method used
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Embodiment Construction
[0006] Take micron-sized thermosetting plastic ABS particles and freeze them at -100~-120°C for 30 minutes in the freezing equipment to reach the critical point of fragmentation of the material, and then keep the material at the critical point of fragmentation at the state of critical point of fragmentation and send it to Enter the jet mill for high-speed impact crushing to obtain nano-scale powder. Materials can be used to collide with each other, and the collision speed can be 2000 kilometers per hour.
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A process for preparing nanometer-level powder includes such steps as preparing micro-class raw material, low-temp freezing to its critical breaking point, and high-speed airflow impact. Its advantages are no secondary pollution and high purity.
Description
Technical field: [0001] The invention relates to a material crushing method, in particular to a crushing method for preparing nanoscale fine-grained materials. Background technique [0002] There are many ways to obtain nano-powders, and high-energy ball milling is one of them. The disadvantage of this method is that there is secondary pollution and mechanical residue mixing, which affects the cleanliness of the material interface; in order to obtain nanopowder with a clean interface, the "coagulation pressurization method" and "amorphous crystallization method" are commonly used at present. The process of preparing nano-powder by "coagulation pressurization method" is mainly: in ultra-high vacuum (generally 10 -6 Pa) Fill the preparation chamber with low-pressure (50Pa~1KPa) inert gas (helium), heat the high-purity raw materials to vaporize them, and control the vaporization speed to keep the particle size of the evaporated molecules within a certain size range. After the...
Claims
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IPC IPC(8): B02C19/00
Inventor 李西根
Owner 李西根
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