Patents Assigned to Vsesojuzny Nauchni-Issledovatelsky Institut Abrazivov I Shlifovania
  • Method of preparing polycrystalline cubic boron nitride
    Patent number: 4148863
    Abstract: According to the invention, a method of preparing polycrystalline cubic bn nitride resides in that hexagonal boron nitride is subjected to the action of pressure of 40-90 kbar and temperature of 1200.degree.-2400.degree. C. in the presence of a catalyst, namely, a zinc compound.The proposed method makes it possible to increase considerably wear resistance of polycrystalline cubic boron nitride used in tools for working hardened steels and alloys.
    Type: Grant
    Filed: June 28, 1978
    Date of Patent: April 10, 1979
    Assignee: Vsesojuzny Nauchni-Issledovatelsky Institut Abrazivov I Shlifovania
    Inventors: Vladimir I. Farafontov, Mirra I. Sokhor, Natalia G. Kushkova, Viktor V. Digonsky, Vladislav S. Lysanov