RT Journal Article
T1 Influence of the processing route on the properties of Ti(C,N)-Fe15Ni cermets
A1 Nicolás Morillas, María de
A1 Besharatloo, H.
A1 Wheeler, J. M.
A1 Dios Pérez, Miguel de
A1 Alvaredo Olmos, Paula
A1 Roa, J. J.
A1 Ferrari, B.
A1 Llanes, L.
A1 Gordo Odériz, Elena
AB This study aims to understand the influence of powder preparation and processing steps on the microstructure and properties of Ti(C,N)-Fe15Ni cermets with 70 and 80 vol% of ceramic phase. Two routes were used for powder preparation: (i) a colloidal approach, consisting of the preparation of stable aqueous suspensions of the powder particles and spray-drying to obtain easy-to-press granules, and (ii) conventional powder metallurgy route, consisting on wet ball milling of powders, with subsequent drying in rotary evaporator. The resultant powder mixtures were uniaxially pressed and sintered in high-vacuum at 1450 °C for 2 h. Sintered samples were characterized in terms of their density, porosity, microstructure (FESEM, image analysis), composition (EDX and XRD), small-scale hardness and sliding contact response by means of massive nanoindentation and nanoscratch testing. C content of the mixture powders was lower for conventional route, lost during milling. After sintering, all the materials, despite the processing route and composition, show C reduction, although that outflow is higher for the conventional powder metallurgy route, and more evident for the composition with higher binder content. As a result, COL samples exhibit a more homogeneous microstructural assemblage, higher small-scale hardness and mechanical integrity under sliding contact conditions. Compositions of materials must then be adjusted to adequate initial C addition with respect to the employed processing route, to account for the effects of the mixtures preparation stage.
PB Elsevier
SN 0263-4368
YR 2020
FD 2020-02
LK https://hdl.handle.net/10016/33910
UL https://hdl.handle.net/10016/33910
LA eng
NO The authors would like to acknowledge the financial support from the Ministerio de Economía y Competitividad, Spanish through the project MAT2015-70780-C4-P and grant BES-2016-077340, and the Regional Government of Madrid through the program ADITIMAT, Ref. S2018/NMT-4411. J. J. Roa acknowledges the Serra Hunter programme of the Generalitat de Catalunya.
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RD 1 sept. 2024