caa a22 4500 388018593 CHVBK 20180307124917.0 cr unu---uuuuu 161130e199811 xx s 000 0 eng 10.1557/JMR.1998.0430 doi S0884291400046641 pii (NATIONALLICENCE)cambridge-10.1557/JMR.1998.0430 Enhanced solid-state reaction kinetics of shock-compressed titanium and carbon powder mixtures [Elektronische Daten] The effect of shock compression on the solid-state chemical reactivity of titanium and carbon powder mixtures was investigated with the objective of forming net-shaped TiC ceramics with a fine-grain microstructure. The combination of defect states and intimate interparticle contacts introduced during shock compression results in significant enhancement of the otherwise sluggish solid-state diffusion of Ti and C through the TiCx boundary layer. The apparent activation energy for TiCx formation was determined using solid-state reaction kinetics models, and was found to be reduced by four-to-six times that of diffusion of Ti into TiCx and two-to-three times that of diffusion of C in TiCx. As a result, net-shaped sections of shock-densified compacts (˜85% dense) were reaction synthesized via solid-state diffusion, producing microstructures with grain size <6 μm and microhardness of ˜2000 kg/mm2, in contrast to statically pressed powder compacts which reacted by a combustion process resulting in a highly porous product. Copyright © Materials Research Society 1998 Lee Jong-Heon School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332-0245 Thadhani Naresh N. School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332-0245 Journal of Materials Research Cambridge University Press 13/11(1998-11), 3160-3173 0884-2914 13:11<3160 1998 13 JMR https://doi.org/10.1557/JMR.1998.0430 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1557/JMR.1998.0430 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Lee Jong-Heon School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332-0245 NATIONALLICENCE 700 1- Thadhani Naresh N. School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332-0245 NATIONALLICENCE 773 0- Journal of Materials Research Cambridge University Press 13/11(1998-11), 3160-3173 0884-2914 13:11<3160 1998 13 JMR CC0 http://creativecommons.org/publicdomain/zero/1.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-cambridge