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Hard alloy comprising one or more hard phases and a binary or multicomponent binder metal alloy
| Details |
Inventors: Holleck, Helmut;
Assignee: Kernforschungszentrum Karlsruhe GmbH (Karlsruhe, DE)
Primary Examiner: Rutledge; L. Dewayne
Assistant Examiner: Zimmerman; J. J.
Attorney, Agent or Firm: Spencer, Kaye & Frank
A hard alloy including at least one hard phase and a binary or multicomponent binder metal alloy, in which the hard substance comprises a finely dispersed, homogeneous distribution in the binder metal. The hard phase comprises a carbide of a Group IVb, Vb or VIb transition metal, and the binder metal alloy comprises a solid alloy of a Group IVb, Vb or VIb transition metal, with Re, Ru, Rh, Pd, Os, Ir, or Pt. |
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DETAILED DESCRIPTION OF THE INVENTION The hard materials of the present invention are formed of a fine dispersion of at least one hard phase in a binary or multicomponent binder metal alloy which serves as a metal matrix or phase.
The hard substance comprises a carbide of a transition metal of Group IVb, Vb or VIb of the Periodic Table of Elements.
The preferred hard substances are the carbides of Mo, Cr, and W.
The carbide component of the hard alloy generally has a composition which corresponds to an atom ratio of transition metal to carbon of 1:1 to 2:1.
The binary or multicomponent binder metal alloy is an alloy of a transition metal of Group IVb, Vb or VIb of the Periodic Table of Elements, with rhenium and/or a "platinum metal" from Group VIIIb of the [K.
Rauscher et al.
: "Chemische Tabellen und Rechentafeln fur die analytische Praxis" (1968), pages 20 and 21].
Periodic Table of Elements.
The platinum metals include Ru, Rh, Pd, Os, Ir and Pt.
Suitable metal phases for the binary binder metal alloy include alloys based on (Pt-Cr), (Pt-Mo), (Pt-W), (Pd-Cr), (Pd-Mo), (Pd-W), (Ru-Cr), (Ru-Mo), (Ru-W), or other platinum metals with Cr, Mo and W.
Preferably, the proportion of transition metal in the binder metal alloy is 2 to 60 mole percent.
In a further advantageous embodiment of the present invention, the proportion of Re or the platinum metal in the binder metal alloy is replaced from 0 to 90 atom percent by iron, cobalt or nickel.
The binder metal alloy can be a multicomponent compound or a mixture of binary compounds.
According to a preferred embodiment of the present invention, the hard alloy contains a hard phase to binder metal alloy ratio between 90 volume percent hard phase to 10 volume percent binder metal alloy and 5 volume percent had phase to 95 volume percent binder metal alloy.
In a preferred method for producing the hard alloy of the present invention, the homogeneous distribution of the hard phase in the binder metal is achieved by forming an intermediate ternary or multicomponent carbide
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