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Properties and functions of diamond and superhard materials

Natural diamond is the hardest material in the world, so as abrasive and cutting tools, its performance is incomparable, with diamond tools as an example, its edge radius can be grinding to even scanning electron microscopy, SEM can not be detected, until now there is no material can instead use it to cut processing, often can obtain the current mirror, is widely applied in the field of electronics, optical instruments, etc., become an indispensable material cutting tool, but because of the expensive cost, grinding virtuosity, so has been hindering its wide application.

Superhard materials because of superior performance, the application of continuous expansion, has been developed from the metal processing to the optical glass processing, stone processing, ceramic processing, hard and brittle materials processing and other traditional processing difficult areas.

Natural diamond, due to anisotropy, so the crystal surface hardness large difference in grinding, choose the soft side as the grinding surface, and the hard surface as the rake face and flank, which brings favorable conditions for grinding, because of its anisotropy, and so on in use, consideration must be given to the reasonable choice, such as crystal face, anvil hardness, in use, by pressing or jumping to measure the detected material hardness, but due to the different working surface hardness, the results are different, of course, hard surface, beneficial to prolonging the life, such as natural and die diamond manufacturing, due to a hole in the surface by the crystal surface, so the hardness is not the same, do not wear uniform, will also give the circular wire caused by stress difference, the hardness is not uniform, and affect the use of sintered diamond And thick film diamond, due to isotropy, the use of such products on the sample/ becomes very favorable.

PCD, PCBN, because of the different grain, different concentration, the performance is different, must be reasonable choice. Thick film diamond is pure diamond, its hardness is close to natural diamond, and PCD, PCDN is made of diamond powder and binder mixed sintering, so the hardness of the binder, its hardness is not as good as the former.

As we all know, diamond and iron have affinity, can only be used in non-ferrous metals and non-metallic materials, and CBN even at 1000 degrees Celsius, cutting black metal is also fully competent. It has become the main cutting tool material in the future. General superhard material refers to man-made diamond, artificial CBN. At the same time, these two kinds of materials play a complementary role, can cover the current and future development of new materials processing, the entire cutting process is extremely favorable.

High precision diamond cutting tool grinding need superb skill, in order to obtain higher accuracy in cutting edge radius, especially the precision is less than 0.05um, put forward very strict requirements on the grinding machine main shaft must have high rotary accuracy, old-fashioned grinding machine is not suitable, more start by air as the bearing support, grinding disc must can be leveled in the machine, so that the face runout control under 0.5um. PCD and PCBN grinding is relatively easy, because the hardness is relatively low, for the diamond wheel can, and thick film diamond is different, its hardness is closer to that of natural diamond, and is isotropic, so the grinding is more difficult.

Recently, diamond cutting tool grinding has aroused people's concern, the new grinding schemes have been proposed, including thermochemical method introduced a lot, such as professor Yoshikawa Masanori of Tokyo Institutet of Technology in Japan is heated to 800 DEG C to cast iron plate. In the aspect of accelerating grinding, it is considered that 70% of the grinding work is in rough grinding, so it is possible to remove most of the remaining amount by using the thermochemical method, and then further study, which can greatly improve the working efficiency of diamond grinding.
No previous NEXT：20 skills of diamond dressing tools

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