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China Developed A Synthetic Diamond And Cubic Boron Nitride Super Hard

QINGDAO KNNJOO MACHINE INC. | Updated: Nov 27, 2015

Diamond-cBN alloy samples and cutting knife: a and b: 20GPa/2200o c under the condition of 3 mm diameter samples, copper screen shows its transparency. C and d: rake face of-cBN alloy diamond cutting and polishing. (Photo: d. W。 He/SCU Sichuan University) on September 8, 2015 Washington-they say diamonds are a substantial change, that is, of course, is in addition to their high temperature for cutting iron, cobalt, nickel, chromium, vanadium is oxidized at the time. Instead, cubic Boron Nitride has a good chemical inertia, but its hardness is only half of the diamond. In order to develop a suitable for industrial materials on superhard materials, researchers at Sichuan University in China has created a diamond and cubic Boron Nitride, alloy, the alloy combines the excellent properties of the two materials. "

Diamond and cubic Boron Nitride is formed easily alloyed to fill defects in performance with each other, because both in terms of lattice structure and characteristics of Covalent and health are similar," Sichuan University Institute of Atomic and molecular physics (Sichauan University's Institute of Atomic and Molecular Physics) Professor said He Duanwei. "But the idea has never been proven, because samples obtained in previous studies was too small to be tested for their actual performance. "

He's Professor and United States University of Nevada (University of Nevada) and the Chinese Academy of Sciences (Chinese Academy of Sciences) collaborators the research was published this week by the United States Institute of Physics Publishing in the journal applied physics letters.

Synthetic diamond-cBN alloys, researchers diamond and cubic Boron Nitride powder mixing in a vacuum furnace calcination at 1300 Kelvin temperature for two hours, and then at pressures above 15 jipasika conditions and under the condition of high temperatures of over 2000 Kelvin material pressed into a 3.5 mm diameter ball. Ball after grinding and sharpening cutting tools.

Researchers tested the alloys on CNC lathe cutting hardened steel and granite of the performance. They found a diamond samples of-cBN alloys in the cutting of hardened steel, wear and tool life comparable to polycrystalline cubic Boron Nitride, and in cutting granite shows less wear and tear. In addition, this alloy also showed better performance for high speed cutting, this exceeds any polycrystalline cubic Boron Nitride polycrystalline diamonds or for commercial use.


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