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Natural diamond tool edge can be machined to extremely sharp. It can be used to make ophthalmic and neurosurgical scalpels; it can be used to machine the surface of contact lenses; it can be used to cut optical glass fibers; it is used to process patterns of gold and platinum jewelry; the most important use is high-speed super-finishing non-ferrous metals and their alloys. Such as aluminum , gold, babbitt, beryllium copper , copper and so on. The super-finishing tool made of natural diamond has a circular arc portion under the microscope of 400 times and is used for processing aluminum alloy polyhedral mirror, oxygen-free copper laser mirror, gyroscope, video recorder drum and the like. The roughness of the expression can reach Ra (0.01-0.025) μm.
Natural diamond materials have poor toughness and low flexural strength, which is only (0.2-0.5) Gpa. Poor thermal stability, loss of hardness when the temperature reaches 700 ° C -800 ° C. When the temperature is higher, it will carbonize. In addition, it has a strong affinity with iron and is generally not suitable for processing steel.
Natural single crystal diamond is an anisotropic single crystal. With a hardness of HV9000-10000, it is the hardest substance in nature. This material has excellent wear resistance, and the finished tool can maintain dimensional stability during cutting for a long time, so it has a long tool life.