Cermet having different types of duplex hard constituents of a core and rim structure in a Co and/or Ni matrix
AssigneeSandvik AB
InventorRolf Oskarsson
Life of this patent
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Abstract
A cermet in which the hard constituents are based on Ti, Zr, Hf, V, Nb, Ta, Cr, Mo and/or W and the binder phase is based on Co and/or Ni and possibly small amounts of Al being present. At least 80% by volume of the hard constituents consist of duplex structures made up of a core and at least one surrounding rim. The duplex hard constituents consist of several, preferably at least two, different hard constituent types concerning the composition of core and/or rim(s). These individual hard constituent types consist each of 10-80%, preferably 20-70% by volume of the total content of hard constituents. In addition, non-duplex hard constituents may be present in amounts of up to 20% by volume of the total hard constituent amount.
Claims35
A cermet comprising hard constituents selected from the group consisting of Ti, Zr, Hf, V, Nb, Ta, Cr, Mo, W, carbides, nitrides, carbonitrides and mixtures thereof and a binder phase selected from the group consisting of Co, Ni and mixtures thereof, at least 80% by volume of the hard constituents consisting of duplex structures comprising a core and at least one rim surrounding the core, the duplex hard constituents consisting of at least two different types of said hard constituents, each of the different types of said duplex hard constituents having compositional ratios or ingredients in the core, rim(s) or core and rim(s) which differ from those of other types of the duplex hard constituents and each of the different types of said duplex hard constituents being present in amounts of 10-80% by volume of a total amount of the hard constituents.
A cermet comprising hard constituents and a binder phase, the binder phase comprising at least one of Ni and Co, the hard constituents including optional first non-duplex hard constituents including at least one compositional ingredient selected from the group consisting of Ti, Zr, Hf, V, Nb, Ta, Cr, Mo and W and a nonoptional second hard constituents including at least one compositional ingredient selected from the group consisting of Ti, Zr, Hf, V, Nb, Ta, Cr, Mo, W, carbides, nitrides, carbonitrides and mixtures thereof, the second hard constituents being present in amounts of at least 80% by volume of a total amount of the hard constituents, each of said second hard constitutents having a duplex structure of a core and at least one rim surrounding the core, the second hard constituents including first duplex grains and second duplex grains, the first duplex grains being different in compositional ratios or ingredients in the core, the rim or the core and the rim than the second duplex grains.
Dependencies are inferred from the claim text.