Preparation and properties of ultra-high temperature ceramics based on ZrC and HfC

0360409 - ÚFP 2012 RIV CH eng J - Journal Article
Brožek, Vlastimil - Ctibor, Pavel - Dong-Ik, Ch. - Seong-ho, Y. - Mastný, L. - Novák, M.
Preparation and properties of ultra-high temperature ceramics based on ZrC and HfC.
Solid State Phenomena. Roč. 170, č. 1 (2011), s. 37-40. ISSN 1012-0394.
[International Conference on Solid Compounds of Transition Elements SCTE/17th./. Annecy, 05.09.2010-10.09.2010]
Institutional research plan: CEZ:AV0Z20430508
Keywords : Zirconium carbide * hafnium carbide * tungsten cermets * hot pressing * plasma spraying
Subject RIV: CA - Inorganic Chemistry
http://www.scientific.net/SSP.170.37

Successful preparation of massive compact bodies from ultra-high temperature ceramics like zirconium carbide, hafnium carbide and their cermets with tungsten matrix with high values of mechanical parameters is difficult. Only limited number of techniques is able to perform it because of their absolutely highest melting points. In our contribution the preparation of these materials by hot-pressing and plasma-spraying is described and chemical processes taking part at the processing are studied. Hot-pressed products fabricated at 2000°C and 6 GPa react with the internal surface of the BELT-type apparatus. Melting and sintering is taking place at plasma spraying. This process carried out by water stabilized plasma torch with centerline temperature up to 30000 K, is joined with undesirable reactions with plasma-forming medium, with oxidation in a turbulent plasma flow and nitridation of free-flight particles. All these chemical processes depend on variety of parameters
Permanent Link: http://hdl.handle.net/11104/0197971