Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7898094 | Journal of the European Ceramic Society | 2018 | 27 Pages |
Abstract
Hot pressing and spark plasma sintering were applied to manufacture electrical discharge machinable ZTA-TiC ceramics containing 17â¯vol.% zirconia (1.5Y) and 24â¯vol.% titanium carbide in an alumina matrix. Sintering was carried out at 1450-1600â¯Â°C and 40â¯MPa pressure with 2â¯h dwell for HP and 10â¯min for SPS. The influence of sintering conditions on mechanical properties, microstructure, phase composition and electrical conductivity was investigated. Both sintering technologies lead to fully densified samples with similar strength and toughness. Hardness was generally lower for SPS. SPS samples develop a finer microstructure. HP samples the TiC grains tend to merge at high sintering so that HP materials reach significantly higher conductivities. Productivity and energy consumption per piece can be significantly decreased by shifting to SPS. Both types of material were ED-machinable. Hot pressed ceramics showed better cutting performance and improved surface quality in trimming operations.
Related Topics
Physical Sciences and Engineering
Materials Science
Ceramics and Composites
Authors
Ulrich Schmitt-Radloff, Frank Kern, Rainer Gadow,