Cermet, method for producing cermet, and cutting tool
AssigneeSumitomo Electric Industries, Ltd.
InventorsTakato Yamanishi, Masato Michiuchi, Keiichi Tsuda
Life of this patent
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Abstract
A cermet contains hard phase particles containing Ti and a binding phase containing at least one of Ni and Co, and 70% or more (by number) of the hard phase particles have a cored structure containing a core and a peripheral portion around the core. The core is composed mainly of at least one of Ti carbide, Ti nitride, and Ti carbonitride, and the peripheral portion is composed mainly of a Ti composite compound containing Ti and at least one selected from W, Mo, Ta, Nb, and Cr. The core has an average particle size α, the peripheral portion has an average particle size β, and α and β satisfy 1.1≦β/α≦1.7.
Claims6
A cermet comprising:
- hard phase particles containing Ti;
- and a binding phase containing at least one of Ni and Co,
- wherein 70% or more of the hard phase particles have a cored structure containing a core and a peripheral portion around the core,
- the core is composed mainly of at least one of Ti carbide, Ti nitride, and Ti carbonitride,
- the peripheral portion is composed mainly of a Ti composite compound containing Ti and at least one selected from W, Mo, Ta, Nb, and Cr,
- the core has an average particle size α, the 70% or more of the hard phase particles have an average particle size β, and α and β satisfy 1.1≦β/α≦1.7, and
- the hard phase particles in the cermet have an average particle size of 1.0 μm or less.
A method for producing cermet, comprising:
- a preparing step of preparing a first hard phase raw powder containing at least one of Ti carbide, Ti nitride, and Ti carbonitride, a second hard phase raw powder containing at least one selected from W, Mo, Ta, Nb, and Cr, and a binding phase raw powder containing at least one of Co and Ni,
- a mixing step of mixing the first hard phase raw powder, the second hard phase raw powder, and the binding phase raw powder in an attritor,
- a shaping step of shaping mixed raw materials prepared in the mixing step, and
- a sintering step of sintering a shaped body produced in the shaping step,
- wherein in the mixing step the attritor has a peripheral speed of 100 to 400 m/min, and the mixing time ranges from 0.1 to 5 hours.
Dependencies are inferred from the claim text.