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Microstructural evolution during sintering of cermets studied using interrupted sintering experiments and novel 2D and 3D FESEM based techniques

: Pötschke, Johannes; Höhn, Sören; Richter, Volkmar; Mayer, Markus


International journal of refractory metals and hard materials 63 (2017), S.47-54
ISSN: 0263-4368
Fraunhofer IKTS ()
Cermet; 3d-FIB tomography; dilatometry; sintering; ion beam preparation; Ti(C,N)

During sintering of cermets the dissolution and precipitation of dissolved MeCs lead to the well-known formation of a core-rim structure. To investigate the microstructural evolution during sintering the sintering process was interrupted at different temperatures and the formation of the core-rim structure traced. EDS mappings and point scans as well as 3D-FIB tomography scans were carried out to study the distribution of added MeCs like Mo2C or WC on ion-beam prepared samples. The studied cermet consisted of a Ti(C,N) hard phase with a mixed Co and Ni binder and added Mo2C. The results show i.e. that within the rim area not only a high amount of MeC exists, but also that during the final stages of sintering in some grains binder inclusions within the rim area and Mo inclusion within the core appear.