Title:
ZIRCONIA MEDIA, BEARING BALL, AND MANUFACTURING METHOD THEREOF
Document Type and Number:
WIPO Patent Application WO/2023/210268
Kind Code:
A1
Abstract:
Provided are a zirconia media having improved wear resistance and durability, zirconia bearing balls, and a manufacturing method thereof. The zirconia media: (a) comprises a ZrO2–Y2O3-based zirconia sintered body, the Y2O3/ZrO2 molar ratio being in a range of 2.5/97.5 to 3.2/96.8 inclusive; (b) has a Al2O3 content in a range of 0.1 to 30.0 mass% inclusive; (c) contains 90% by volume or more of tetragonal zirconia; (d) has a relative density of 95% or more; (e) has an average crystal grain size in a range of 0.25 to 0.50 μm inclusive; (f) has a minimum compression load value of Pmin (N)>600×D2.0 (D being the average media diameter); (g) has a Weibull coefficient of crushing load value of 10 or more; and (h) has a media diameter coefficient of variation of less than 6%.
Inventors:
KOTO NOE (JP)
SUGIMOTO WAKANA (JP)
OHNISHI HIROSHI (JP)
SUGIMOTO WAKANA (JP)
OHNISHI HIROSHI (JP)
Application Number:
PCT/JP2023/013825
Publication Date:
November 02, 2023
Filing Date:
April 03, 2023
Export Citation:
Assignee:
NIKKATO CORP (JP)
International Classes:
B02C17/20; C04B35/488
Foreign References:
| JP2014205586A | 2014-10-30 | |||
| JP2000239063A | 2000-09-05 | |||
| JPH06183833A | 1994-07-05 | |||
| JP2017056429A | 2017-03-23 | |||
| JP2002001144A | 2002-01-08 | |||
| JPH09188562A | 1997-07-22 | |||
| JPH0615191A | 1994-01-25 | |||
| JP2003314556A | 2003-11-06 | |||
| JP2013148127A | 2013-08-01 | |||
| JP2001163666A | 2001-06-19 | |||
| JPH1085619A | 1998-04-07 | |||
| JP2014092259A | 2014-05-19 | |||
| US20200223755A1 | 2020-07-16 |
Attorney, Agent or Firm:
ICHIZAWA, KAWADA & ASSOCIATES (JP)
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