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Diamond, superhard material properties and effects
Time：2018-04-27
Natural single crystal diamond is the hardest material in the world, so its performance as an abrasive and cutting tool is unsurpassed. Take the diamond turning tool as an example, the radius of the cutting edge arc can be sharpened to the scanning electron microscope, SEM, also Can not detect, until now there is no material to replace it, use it to cut processing, often can directly obtain a mirror, is currently widely used in instrumentation, electronics, optics and other fields, has become an indispensable material for cutting tools, but because The cost is expensive and sharp grinding requires superb craftsmanship, which has hindered its wide application.
Due to the superior performance of superhard materials, the application is constantly expanding, and has progressed from metal processing to optical glass processing, stone processing, ceramic processing, hard and brittle material processing and other traditional processing difficult to carry out.
Because of the anisotropy of natural single crystal diamond, the hardness of each crystal surface is very different. When the tool is sharpened, choose the soft side as the grinding surface and the hard surface as the rake surface or flank. This brings favorable conditions for the grinding, because of its anisotropy, so in use, we must consider the reasonable choice of crystal face, for example, the anvil of the hardness tester, in use, use the press-in or bounce to measure The hardness of the material is measured, but the result is also different due to the different hardness of the working surface. Of course, the use of a hard surface is conducive to prolonging the life, and the wire drawing die made of natural diamond, since the working face of the hole is composed of crystal faces, Hardness is not uniform, wear will not be uniform, but also will give the wire round cross section caused by stress differences, uneven hardness, and affect the use of diamond sintered body and thick film diamond, due to isotropic, in the use of such products on the sample / change It's very good.
PCD, PCBN, due to their different crystal grains, different concentrations, different performance, must be a reasonable choice. Thick film diamond is pure diamond, its hardness is close to natural diamond, and PCD, PCDN is diamond powder and binder mixed and sintered together, so the hardness is affected by the binder, its hardness is not as good as the former.
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