This is a problem that the micro powder production and users are concerned. Artificial diamond micropower is mainly used in grinding and polishing processes. Users often require the best surface roughness and workpiece with the lowest diamond concentration and fastest cutting speed. To achieve such high use effects, no high -quality micro powder is not possible. According to years of production practice experience, it is believed that good quality micro powder should be controlled from the following aspects:
(1) the strength of diamond material raw materials should be high, and diamonds produced by large manufacturers such as Zhongnan, Yellow River, as raw materials. The better the quality of diamond micro powder, the better the abrasion resistance and cutting force, which is the micro-powder made in the market that is commonly said in the market. The micro-powder made from the low process materials produced by small manufacturers, the abrasion resistance and cutting force are relatively poor, which is generally referred to as the micro powder made of green materials, but the green micro-powder is suitable for low -end resin bond products , cheap price. When non -metallic materials such as crystals and zircon, good quality powder should be used. The micro-powder with poor quality has no cutting force and the convex marks on the surface cannot be grinded, so it is not easy to light up.
(2) The size and content of coarse particles should be strictly controlled. Rough particles should be controlled in the scope specified in national standards, the less the better. Those who are greater than coarse particles are large particles, which can easily cause workpieces to scratch. This must not be available.
(3) particle size distribution, the higher the concentration, the better.
(4) The shape of the particles. Good micropower has a better effect in polishing. It has a good application effect in block, polygonal corners, multi -blade, and low magnetic high -strength micro powder in diamond plating. Block -shaped and sliced, relatively sharp, is mostly used in resin bond wheels.
Green material micro powder is suitable for application in the loose tissue binder, such as sponge in stone tools. Micro powder is prone to cracking, the cutting edge is much, and fall off quickly. The effect is also ok.
Generally speaking, under the microscope, the flake powder has low strength, strong cutting force and good quality. Coarse micro diamond abrasive powder is easier to judge, good micro powder under the microscope, transparency is good, its core is transparent, surrounded by black edge outline, bad micro powder, the whole is black; Ultra-fine powder refers to the micro powder with particle size less than 1.5 μm, which needs to be immersed in the tar with an objective lens for observation and amplification of 1600 times. Conventional glycerin sample preparation is not easy to observe and easy to aggregate. The quality of ultrafine powder can be distinguished from imaging, but it needs more practice and observation. There is also an advanced method, which is to use the differential thermal analysis instrument made in Germany to judge the initial oxidation temperature of the micro powder. Because the price of the instrument is relatively expensive, it is unfavorable to popularize in industrial production.
In order to solve this problem, after a lot of practice, finally using a new dispersant, successfully solved the problem of ultra-fine powder dispersion, using Japanese microscope oil immersion, imaging clear.
Scanning electronic microscope observation ultra -fine powder and nano -diamond micro -powder are very clear and accurate size measurement, but the surface of the micro powder granules requires a layer of metal membrane to observe. Essence From this perspective, traditional biological microscope observation still has great advantages.
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