Manufacturing of electrical discharge machinable ZTA-TiC - hot pressing vs. spark plasma sintering

作者：Schmitt Radloff Ulrich; Kern Frank; Gadow Rainer

来源：Journal of the European Ceramic Society, 2018, 38(10): 3585-3594.

DOI：10.1016/j.jeurceramsoc.20l8.03.025

• ZTA-TiC
• Hot pressing
• Spark plasma sintering
• Mechanical properties
• EDM

Hot pressing and spark plasma sintering were applied to manufacture electrical discharge machinable ZTA-TiC ceramics containing 17 vol.% zirconia (1.5Y) and 24 vol.% titanium carbide in an alumina matrix. Sintering was carried out at 1450-1600 degrees C and 40 MPa pressure with 2 h dwell for HP and 10 mm 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.

• 出版日期2018-8