Titanium-based carbonitride alloy with wear resistant surface la

Details Titanium-based carbonitride alloy with wear resistant surface la Titanium-based carbonitride alloy with wear resistant surface la

1992-06-15

1994-08-09

Walsh, Donald P.

Specialized metallurgical processes, compositions for use therei

Compositions

Consolidated metal powder compositions

75243, 75244, 428547, 428552, 428610, 148206, 148207, 419 10, 419 29, 427585, C22C 2900, B22F 300

Patent

active

053362926

ABSTRACT:
A sintered body of titanium-based carbonitride alloy according to the invention comprises carbonitride hard constituents in 5-25% binder phase where the hard constituents contain, in addition to Ti, one or more of the metals Zr, Hf, V, Nb, Ta, Cr, Mo and/or W and the binder phase is based on cobalt and/or nickel. The sintered body has at least one outer surface with a <50 .mu.m thick surface layer of a titanium-rich cubic carbonitride. Below this layer there is a <100 .mu.m thick binder phase enrichment zone. The binder phase content can be >1.2 of that in the inner part of the body D. Under the binder phase enrichment zone, there is a <250 .mu.m thick binder phase depleted zone C. The binder phase content in this zone has a lowest level <0.9 of the binder phase content in the inner part of the body D.
Such sintered bodies are manufactured by heat treatment in an atmosphere of N.sub.2 and/or NH.sub.3 possibly in combination with at least one of CH.sub.4, CO and CO.sub.2 at 1100.degree.-1350.degree. C. for 1-25 hours at atmospheric pressure or higher.

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Kotani Jiro et al, "Wear-Resistant Titanium Carbonitride-Based Cermets for Cutting Tools":, Chemical Abstracts, vol. 114, No. 12, Mar. 25, 1991, Columbus, Ohio, p. 310, Abstract No. 107 310a.

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