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News

Quality Inspection diamond powder particle size - diamond powder particle size test

  • Author:Huang Xueyu
  • Source:www.boreway.com
  • Release on:2016-04-21
   Particle inspection requirements
    Diamond PowderThe main job of grinding and polishing, particle size control is particularly important, as long as the coarse oversize workpiece will cause scratches, so previous work come to naught, so powder quality inspection is to ensure that an important part of quality powder products. Only seriously in order to produce high-quality powder, to meet the needs of users.
Diamond powder quality inspection, the use of national standard JB / T7990-2012 prescribed method test, test items include size ranges, particle size distribution, particle shape, impurity content. The main particle size diamond powder were M 0 / 0.25, M 0 / 0.5, M 0/1, M 0.5 / 1, M 1/2, M 2/4, M 3/6, M 4/8, M 5 / 10, M 6/12, M 8/12, M 8/16, M 10/20, M 15/25, M 20/30, M 25/35, M 30/40, M 35/55, M 40 / 60, M 50/70. Particle size range of special applications agreed upon by both parties.
    Particle inspection method
In practice, the main measurement using laser diffraction particle diameter diamond powder, commonly used instrument British Malvern Mastersizer 2000 laser particle size analyzer, Microtrac America's S3500 series laser particle size analyzer andX100 laser particle size analysis equipmentWait.
The principle of laser particle size analysis instrument that is: when the light is irradiated onto the particles, scattering and diffraction occurs, the intensity of the diffracted light scattering and are about the size of the particles observed light intensity, can be applied to Fraunhofer diffraction theory Mie scattering theory and particle diameter distribution is obtained. When measuring the dispersion should pay attention to the problem of powder, the powder particles to avoid agglomeration.
Advantage of laser particle size analysis measuring instrument is convenient and highly reproducible, can be a good measure of the particle size distribution curve of the sample and the degree of concentration; more spherical particles, measuring more accurate, widely used in the industry. Its disadvantage is irregularly shaped and elongated particles measured inaccurate low values ​​measured. This may be related to the measurement principle itself: software measurement calculations, the irregular shape and elongated spherical particles are converted into, and then calculate the diameter of the sphere as the particle size, the measurement data is low. To overcome this drawback, in practice, the use of images and biological microscopy inspection, mainly the large particles and long particles, laser particle size analyzer and a microscopic examination combined with each other in the double-check method, ensure the quality of fine powder. The major domestic manufacturers of powder, such as Henan Huifeng, Huajing micro drilling, joint abrasives, Henan SFD, Henan Hongxiang, Yaron Henan, Henan force new materials, superhard materials Tyrone Luohe, Henan Kim, of Beijing Lide, Kate Hunan etc.enterpriseIn both applications.