Title:
CERAMIC SINTERED BODY, INSERT, CUTTING TOOL, AND FRICTION STIR WELDING TOOL
Document Type and Number:
WIPO Patent Application WO/2019/065372
Kind Code:
A1
Abstract:
Provided are: a ceramic sintered body having an excellent wear resistance and chipping resistance; and an insert, cutting tool, and friction stir welding tool that use this ceramic sintered body having these excellent properties. The ceramic sintered body contains Al2O3 (alumina), WC (tungsten carbide), and ZrO2 (zirconia), and the element Zr (zirconium) is present at one or both of the following grain boundaries (1) and (2).
(1) the grain boundaries between Al2O3 crystal grains
(2) the grain boundaries between Al2O3 crystal grains and WC crystal grains
In addition, the ceramic sintered body contains 55.0-97.5 vol% WC and 0.1-18.0 vol% ZrO2 with the remainder being Al2O3, and the ZrO2 is composed of tetragonal crystals (T) or mixed crystals of tetragonal crystals (T) and monoclinic crystals (M).
Inventors:
KOJIMA YOSHITO (JP)
YONEKURA HIROSHI (JP)
KATSU YUSUKE (JP)
MITSUOKA TAKESHI (JP)
YONEKURA HIROSHI (JP)
KATSU YUSUKE (JP)
MITSUOKA TAKESHI (JP)
Application Number:
PCT/JP2018/034497
Publication Date:
April 04, 2019
Filing Date:
September 18, 2018
Export Citation:
Assignee:
NGK SPARK PLUG CO (JP)
International Classes:
C04B35/56; B23B27/14; C04B41/87
Domestic Patent References:
| WO2014002743A1 | 2014-01-03 | |||
| WO2015019391A1 | 2015-02-12 | |||
| WO2018056275A1 | 2018-03-29 |
Foreign References:
| JP2016113320A | 2016-06-23 | |||
| JPS57100976A | 1982-06-23 | |||
| JPH03290356A | 1991-12-20 | |||
| JP5654714B1 | 2015-01-14 | |||
| JP2006175561A | 2006-07-06 | |||
| JP2014198637A | 2014-10-23 |
Other References:
See also references of EP 3689839A4
Attorney, Agent or Firm:
GRANDOM PATENT LAW FIRM (JP)
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