Electrical Discharge Machinable Ytterbia Samaria Co-Stabilized Zirconia Tungsten Carbide Composites

Composite ceramics of stabilizer oxide coated ytterbia-samaria costabilized zirconia (1.5Yb1.5Sm-TZP) and 24–32 vol% of tungsten carbide as an electrically conductive dispersion were manufactured by hot pressing at 1300–1400 °C for 2 h at 60 MPa pressure. The materials were characterized with respec...

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Bibliographic Details
Published in:Ceramics 2021-09, Vol.4 (3), p.408-420
Main Authors: Rapp, Maximilian, Gommeringer, Andrea, Kern, Frank
Format: Article
Language:English
Subjects:
Ceramic coatings
Die sinking
Electric discharges
electrical discharge machining
Hot pressing
Investigations
Machinability
Mechanical properties
Microstructure
Nanocomposites
Phase composition
Silicon nitride
Sintering
Tetragonal zirconia polycrystals
Titanium
Tungsten carbide
zirconia
Zirconium dioxide
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Summary:Composite ceramics of stabilizer oxide coated ytterbia-samaria costabilized zirconia (1.5Yb1.5Sm-TZP) and 24–32 vol% of tungsten carbide as an electrically conductive dispersion were manufactured by hot pressing at 1300–1400 °C for 2 h at 60 MPa pressure. The materials were characterized with respect to microstructure, phase composition, mechanical properties and electrical discharge machinability by die sinking. Materials with a nanocomposite microstructure and a strength of up to 1700 MPa were obtained. An attractive toughness of 6–6.5 MPa√m is achieved as 40–50% of the zirconia transformed upon fracture. The materials show fair material removal rates of 1 mm³/min in die sinking. Smooth surfaces indicate a material removal mechanism dominated by melting.
ISSN:2571-6131
2571-6131
DOI:10.3390/ceramics4030030