Title:
CEMENTED CARBIDE AND CUTTING TOOL
Document Type and Number:
WIPO Patent Application WO/2017/191744
Kind Code:
A1
Abstract:
Provided is cemented carbide comprising a hard phase, a binder phase, and unavoidable impurities. The hard phase is provided with a first hard phase having tungsten carbide as its main component and with a second hard phase having as its main component a compound containing a plurality of metal elements including tungsten and at least one element selected from carbon, nitrogen, oxygen, and boron. The second hard phase satisfies D10/D90 < 0.4 where D10 is the 10% cumulative grain size and D90 is the 90% cumulative grain size in the area-based grain size distribution determined from any surface or cross section of the cemented carbide. Defining σ2 as the variance on the distance between the centroids of two nearest neighbor second hard phases, the second hard phase satisfies σ2 < 5.0. Defining DW as the average grain size of the first hard phase and DM as the average grain size of the second hard phase, DW is 0.8 μｍ to 4.0 μｍ and DM/DW < 1.0 is satisfied.
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Inventors:
KIDO YASUKI (JP)
MATSUKAWA MICHIKO (JP)
TSUDA KEIICHI (JP)
MATSUKAWA MICHIKO (JP)
TSUDA KEIICHI (JP)
Application Number:
PCT/JP2017/015138
Publication Date:
November 09, 2017
Filing Date:
April 13, 2017
Export Citation:
Assignee:
SUMITOMO ELECTRIC INDUSTRIES (JP)
International Classes:
C22C29/08; B22F3/24; B23B27/14; C22C1/05
Foreign References:
| JPH0273946A | 1990-03-13 | |||
| JP2006063416A | 2006-03-09 | |||
| JPH04116134A | 1992-04-16 | |||
| JP2005200671A | 2005-07-28 | |||
| JP2016020541A | 2016-02-04 |
Other References:
See also references of EP 3453776A4
Attorney, Agent or Firm:
NAKATA Motomi et al. (JP)
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