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High-Pressure Sintering of Rhombohedral Cr2S3 Using Titanium-Zirconium-Molybdenum Tools

 
: Groeneveld, Dennis; Groß, Hendrik; Hansen, Anna-Lena; Dankwort, Torben; Hansen, Julian; Wöllenstein, Jürgen; Bensch, Wolfgang; Kienle, Lorenz; König, Jan D.

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Advanced engineering materials 21 (2019), Nr.11, Art. 1900430, 7 S.
ISSN: 1438-1656
ISSN: 1615-7508
ISSN: 1527-2648
Deutsche Forschungsgemeinschaft DFG
BE1653/36-1
Deutsche Forschungsgemeinschaft DFG
KI1263/16-1
Deutsche Forschungsgemeinschaft DFG
KO5397/2-1
Englisch
Zeitschriftenaufsatz
Fraunhofer IPM ()
chromium sulfides; spark plasma sintering; microstructure; thermoelectricity

Abstract
The influence of sintering parameters on the physical properties and the chemical structure of rhombohedral Cr2S3 (rh‐Cr2S3) is investigated using high pressures and high temperatures. The densification of the powder is performed by applying the high‐pressure field‐assisted sintering technique/spark plasma sintering. Using a titanium–zirconium–molybdenum (TZM) alloy as sintering tool, it is possible to increase the magnitude of the applied pressure to several hundred MPa at temperatures as high as 1223 K. A relative density of up to 99.9% is achieved at a sintering temperature of 1223 K and a pressure of 395 MPa. The presence of phase‐pure rh‐Cr2S3 is proven by X‐ray diffraction analysis and transmission electron microscopy. The Seebeck coefficients of the self‐doped samples change drastically with the sintering temperatures ranging between −650 and −350 μV K−1. The densities and the thermal conductivities of the sintered samples increase with increasing sintering temperatures. The electrical conductivity is largely increased compared with the thermal conductivity potentially due to the current‐assisted high‐pressure sintering.

: http://publica.fraunhofer.de/dokumente/N-564948.html