Title:
CEMENTED CARBIDE AND CUTTING TOOL COMPRISING SAME
Document Type and Number:
WIPO Patent Application WO/2021/199260
Kind Code:
A1
Abstract:
A cemented carbide comprising: a first phase including a plurality of tungsten carbide particles; and a second phase containing cobalt, wherein when the equivalent circular diameter of each of the tungsten carbide particles is calculated by performing image processing on an image of the cemented carbide captured using a scanning electron microscope, the proportion of tungsten carbide particles having an equivalent circular diameter of 0.3-1.0 μm is at least 50% in terms of number of particles, and when the distribution of the equivalent circular diameters of the tungsten carbide particles is represented by a histogram in which the vertical axis indicates count and the horizontal axis indicates tiers, said count represents the number of tungsten carbide particles, and the tiers are formed by delimiting the equivalent circular diameter in an ascending order at an interval of 0.1 μm, and, on the horizontal axis, a range of more than 0.3 μm but not more than 0.6 μm is designated as a first range and a range of more than 0.6 μm but not more than 1.0 μm is designated as a second range, and the first range and the second range each have at least one local maximum count, and, of the local maximum counts in the first range, the proportion of tungsten carbide particles resulting in a first local maximum count that is the largest with respect to the total number of tungsten carbide particles is 10% or more, and, of the local maximum counts in the second range, the proportion of tungsten carbide particles resulting in a second local maximum count that is the largest with respect to the total number of tungsten carbide particles is 10% or more.
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Inventors:
HIROSE KAZUHIRO (JP)
YAMAKAWA TAKAHIRO (JP)
YAMAKAWA TAKAHIRO (JP)
Application Number:
PCT/JP2020/014778
Publication Date:
October 07, 2021
Filing Date:
March 31, 2020
Export Citation:
Assignee:
SUMITOMO ELECTRIC HARDMETAL CORP (JP)
International Classes:
C22C29/08; C22C1/05
Domestic Patent References:
| WO2018180911A1 | 2018-10-04 |
Foreign References:
| JPH09227981A | 1997-09-02 | |||
| CN101845579A | 2010-09-29 | |||
| JP2009007623A | 2009-01-15 | |||
| JP2018154917A | 2018-10-04 | |||
| JPH07252579A | 1995-10-03 |
Attorney, Agent or Firm:
FUKAMI PATENT OFFICE, P.C. (JP)
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