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按照我国粉末级别的规定,凡是粒度小于0.5μ的粉末称为超细粉末,见表1。表1——我国粉末级别的分类表欧美一些国家通常把小于1μ的粉末定义为超细粉,而日本则把小于10μ的粉末定义为超细粉。随着超细粉末研究和测试工作的开展,用“μ”(微米)作单位来表示它的尺寸已经显得不方便了,进而一些国家开始用“(?)”(1(?)=1/10000μ)来描写它,划分它,并且用“粒子”的概念赋与它以新的含义。日本人通常将小于500(?)的超细粉末称为超微粒子。德国人则将1μ—500(?)的粉末称为微粒子,500～100(?)的称为亚微粒子,小于100(?)的称为超微粒子。
In accordance with the provisions of China’s powder level, any particle size less than 0.5μ called the ultrafine powder, see Table 1. Table 1 - Classification Table of China’s Powder Grade In some countries in Europe and the United States, the powder smaller than 1μ is usually defined as ultrafine powder, whereas in Japan, the powder smaller than 10μ is defined as ultrafine powder. With the development of ultrafine powder research and testing, it has become inconvenient to use “μ” (micron) as a unit to represent its dimensions, and some countries have started to use “(?)” 10000μ) to describe it, divide it, and assign it a new meaning with the concept of “particles.” Japanese usually will be less than 500 (?) Of the ultrafine powder called ultrafine particles. Germans will be 1μ-500 (?) Of the powder as the particles, 500 ~ 100 (?) Called sub-particles, less than 100 (?) Called the ultrafine particles.