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New Hardmetals Based on TiB2

Jungling, T.; Sigl, L. S.; Oberacker, R.; Thummler, F.; Schwetz, K. A.

Abstract: Sintering of TiB2-hardmetals with ferrous binders results in the formation of parasitic Fe2B which consumes a good part of the ductile binder. Besides Fe2B, Ti2O3 is formed during sintering. Thermodynamic considerations, dilatometry and X-ray analysis show that the impurities in commercially available TiB2-powders are responsible for the development of these phases. It is possible to avoid Fe2B by adding metals with a higher affinity to boron than iron. Based on these investigations, TiB2-hardmetals with single phase Fe-Cr-Ni binders or two phase Fe2B-Fe-Cr-Ni binders were produced. The binder content was varied between 5 and 20 vol.%. These TiB2-hardmetals show better hardness-fracture toughness combinations than conventional WC-Co-hardmetals or Ti(C,N)-cermets and excellent hot hardness. These properties are very promising at the present state of development, and it appears that the full potential of the system has probably not yet been reached. Further progress seems to be possible, when fine grained TiB2-powders with low O and C content and little excess boron become available. Such powders are expected to improve sintering behaviour, microstructure and mechanical properties of TiB2-hardmetals.

Zugehörige Institution(en) am KIT Institut für Keramik im Maschinenbau (IKM)
Publikationstyp Zeitschriftenaufsatz
Jahr 1994
Sprache Englisch
Identifikator ISSN: 0263-4368
KITopen ID: 1000007785
Erschienen in International Journal of Refractory Metals & Hard Materials
Band 12
Heft 2
Seiten 71-88
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