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

外国特許コード F180009461
整理番号 (S2017-0055-N0)
掲載日 2018年7月31日
出願国 世界知的所有権機関(WIPO)
国際出願番号 2017JP039979
国際公開番号 WO 2018088369
国際出願日 平成29年11月6日(2017.11.6)
国際公開日 平成30年5月17日(2018.5.17)
優先権データ
  • 特願2016-220331 (2016.11.11) JP
発明の名称 (英語) CUBIC BORON NITRIDE POLYCRYSTALLINE BODY AND METHOD FOR PRODUCING SAME, AND CUTTING TOOL AND GRINDING TOOL NEW
発明の概要(英語) 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.
特許請求の範囲(英語) [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.
  • 出願人(英語)
  • ※2012年7月以前掲載分については米国以外のすべての指定国
  • EHIME UNIVERSITY
  • 発明者(英語)
  • ICHIDA YOSHIO
  • IRIFUNE TETSUO
  • OHFUJI HIROAKI
国際特許分類(IPC)
指定国 (WO201888369)
National States: AE AG AL AM AO AT AU AZ BA BB BG BH BN BR BW BY BZ CA CH CL CN CO CR CU CZ DE DJ DK DM DO DZ EC EE EG ES FI GB GD GE GH GM GT HN HR HU ID IL IN IR IS JO JP KE KG KH KN KP KR KW KZ LA LC LK LR LS LU LY MA MD ME MG MK MN MW MX MY MZ NA NG NI NO NZ OM PA PE PG PH PL PT QA RO RS RU RW SA SC SD SE SG SK SL SM ST SV SY TH TJ TM TN TR TT TZ UA UG US UZ VC VN ZA ZM ZW
ARIPO: BW GH GM KE LR LS MW MZ NA RW SD SL SZ TZ UG ZM ZW
EAPO: AM AZ BY KG KZ RU TJ TM
EPO: AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
OAPI: BF BJ CF CG CI CM GA GN GQ GW KM ML MR NE SN ST TD TG
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