Pulsed electric current sintering of TiC-Ultimet powders and effect of binder content on microstructure and mechanical properties

M. E. Cura, R. Ritasalo, U. Kanerva, J. Syrén, J. Oksanen, J. Lotta, T. Suhonen, J. Lagerbom, O. Söderberg, E. Turunen, S. P. Hannula

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

1 Citation (Scopus)

Abstract

TiC-Ultimet® powders were prepared with Ultimet® (54Co-26Cr-9Ni-5Mo-3Fe-2W) contents of 12, 25, and 40 wt%, by Spex ball milling under argon atmosphere. They were compacted with pulsed electric current sintering (1473-1548 K, 5-8 min, 50 MPa). Density of the samples (Ø20, Ø25, Ø40 mm) was studied by Archimedes method. Microstructures were analyzed using optical microscopy, SEM, and XRD. Mechanical properties were studied with instrumented indentation tests. Fracture toughness was evaluated by determining KIC in HV30 tests. The critical crack initiation load (Pcr) was measured by instrumented Vickers indentation test. Density of the samples increased with processing temperature. During processing Ultimet® was partially melted and distributed evenly among the carbides. This composite structure has high hardness of 2100-2400 HV1 independent of the Ultimet® content. Although these composites are quite brittle their ductility is better than that of pure TiC.

Original languageEnglish
Title of host publicationProceedings of the World Powder Metallurgy Congress and Exhibition, World PM 2010
PublisherEuropean Powder Metallurgy Association
Volume3
ISBN (Print)9781899072194
Publication statusPublished - 1 Jan 2010
MoE publication typeA4 Article in a conference publication
EventWorld Powder Metallurgy Congress and Exhibition - Florence, Italy
Duration: 10 Oct 201014 Oct 2010

Conference

ConferenceWorld Powder Metallurgy Congress and Exhibition
Abbreviated titleWorld PM
CountryItaly
CityFlorence
Period10/10/201014/10/2010

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