Characterisation and Performance Optimisation of WC-MC/M(C,N)-Co Hardmetals

WC-MC/M(C,N)-Co hardmetals with 10 wt% Co were prepared in undoped, as well as in either Cr- or V-doped form. The starting formulations contained 5 wt% TiC or 5% (TiC+TiN), the latter with two different TiC/TiN ratios, and 10 wt% (Ta,Nb)C. For each composition, a low-C grade (Ms ≈ 75%) and a high-C...

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Bibliographic Details
Published inMetals (Basel ) Vol. 9; no. 4; p. 435
Main Authors Hochenauer, Roman, Lengauer, Walter
Format Journal Article
LanguageEnglish
Published Basel MDPI AG 01.04.2019
Subjects
Alloys
Aluminum oxide
Cemented carbides
Composition
Creep rupture strength
Crystallites
cubic carbides
Differential thermal analysis
Electron backscatter diffraction
Electron probe microanalysis
Fracture toughness
hardness
Heat conductivity
Hot pressing
ISO M
ISO P
Liquid phases
milling
Nitrogen
Optimization
Oxidation resistance
Scanning electron microscopy
Sintering
Size distribution
Thermal conductivity
Titanium carbide
Tungsten carbide
United States > US
Austria
Germany
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Summary:WC-MC/M(C,N)-Co hardmetals with 10 wt% Co were prepared in undoped, as well as in either Cr- or V-doped form. The starting formulations contained 5 wt% TiC or 5% (TiC+TiN), the latter with two different TiC/TiN ratios, and 10 wt% (Ta,Nb)C. For each composition, a low-C grade (Ms ≈ 75%) and a high-C grade (Ms ≈ 88%) was adjusted by C or W addition, to end up with 18 different hardmetal formulations, prepared in an industrial process. Model alloys, MC and M(C,N) phases with a composition reflecting the composition of these phases in the hardmetal were prepared, too. A variety of data was collected: binder phase and hard phase compositions of model alloys by wavelength-dispersive electron-probe microanalysis (WDS-EPMA), liquid phase formation temperatures in model alloys with free C and eta by differential thermal analysis (DTA), respectively, thermal conductivities of MC and M(C,N) phases and hardmetals by laser-flash temperature conductivity and heat capacity measurements up to 950 °C, crystallite-size distribution by electron backscatter diffraction EBSD, hardness HV30, Palmqvist-Shetty fracture toughness KIC, Weibull evaluation of the transverse rupture strength (TRS), oxidation resistance in air as well as milling tests on coated hardmetals with Ti(C,N)/Al2O3 and (Ti,Al)N layers.
ISSN:2075-4701
2075-4701
DOI:10.3390/met9040435