Top > Search of International Patents > CUBIC BORON NITRIDE POLYCRYSTALLINE BODY AND METHOD FOR PRODUCING SAME, AND CUTTING TOOL AND GRINDING TOOL

CUBIC BORON NITRIDE POLYCRYSTALLINE BODY AND METHOD FOR PRODUCING SAME, AND CUTTING TOOL AND GRINDING TOOL

Foreign code F180009461
File No. (S2017-0055-N0)
Posted date Jul 31, 2018
Country WIPO
International application number 2017JP039979
International publication number WO 2018088369
Date of international filing Nov 6, 2017
Date of international publication May 17, 2018
Priority data
  • P2016-220331 (Nov 11, 2016) JP
Title CUBIC BORON NITRIDE POLYCRYSTALLINE BODY AND METHOD FOR PRODUCING SAME, AND CUTTING TOOL AND GRINDING TOOL
Abstract A cubic boron nitride (cBN) polycrystalline body according to the present invention is a non-orientation polycrystalline body composed of cBN single-phase crystal structures having an average grain diameter of 200 nm or less, and has a Knoop hardness of 50 GPa or more. The Knoop hardness can be adjusted to 53 GPa or more by adjusting the average grain diameter to 100 nm or less, and it makes it possible to use the polycrystalline body suitably as a sharp cutting tool cutting edge or the like by adjusting the average grain diameter to 50 nm or less. A Knoop hardness of 54.5 GPa or more can be achieved in a cBN polycrystalline body in which cBN coarse crystal grains having an average grain diameter of 120 to 165 nm are dispersed in cBN fine polycrystalline structures having an average grain diameter of 70 nm or less and the average grain diameter of the polycrystalline body including the fine polycrystalline structures and the coarse crystal grains is 100 nm or less. The cBN polycrystalline body according to the present invention can be produced by retaining a raw material, which is composed of pyrolytic boron nitride (pBN) and is oriented in the [001] direction, at a predetermined temperature for a predetermined time period under a pressure of 25 GPa or more to convert pBN to cBN directly.
Scope of claims [claim1]
1. An average particle diameter of 200nm or less of cubic boron nitride consists of a single-phase crystal structure of the non-oriented polycrystalline body, characterized in that the hardness equal to or greater than 50GPa and polycrystalline cubic boron nitride.
[claim2]
2. Wherein the average particle diameter of 100nm or less, wherein 53GPa is greater than or equal hardness according to claim 1 characterized in that the polycrystalline cubic boron nitride.
[claim3]
3. An average particle diameter of 70nm or less of cubic boron nitride in a fine grain poly-crystalline structure, an average particle diameter of the layer of cubic boron nitride in 115-165nm coarse crystal grains are dispersed, the coarse and fine grain poly-crystalline structure with crystal grains of the polycrystalline material of 100nm or less average particle size of the polycrystalline body of, characterized in that the hardness is greater than or equal to 53.5GPa according to claim 1 or 2 polycrystalline cubic boron nitride.
[claim4]
4. Wherein the average particle diameter of crystal grain roughness or 120-165nm, the hardness equal to or greater than 54.5GPa according to claim 3 characterized in that the polycrystalline cubic boron nitride.
[claim5]
5. Wherein the average particle diameter of 50nm or less of cubic boron nitride according to claim 2 characterized in that the polycrystalline material.
[claim6]
6. Any one of claims 1-5 of polycrystalline cubic boron nitride comprising the tool cutting edge comprises a cutting tool.
[claim7]
7. Any one of claims 1-5 of polycrystalline cubic boron nitride abrasive grains made of the cutting edge comprises a grinding tool and.
[claim8]
8. As the starting material comprises pyrolytic boron nitride 001: are oriented in a direction of a step of preparing a raw material, the above described raw material at a predetermined temperature equal to or more than 25GPa pressure by a predetermined period, wherein the pyrolytic boron nitride and cubic boron nitride includes the step of directly converting characterized in that the method for manufacturing a polycrystalline cubic boron nitride.
  • Applicant
  • ※All designated countries except for US in the data before July 2012
  • EHIME UNIVERSITY
  • Inventor
  • ICHIDA YOSHIO
  • IRIFUNE TETSUO
  • OHFUJI HIROAKI
IPC(International Patent Classification)
Shikoku TLO is introducing the seeds of 4 inside 20 university and a technical college. Please ask to the following about the detailed contents of seeds. I am waiting for an inquiry.

PAGE TOP

close
close
close
close
close
close