Analysis of powder particles of high carbon cast iron after air plasma spraying

0341008 - ÚFM 2010 RIV US eng C - Conference Paper (international conference)
Schneeweiss, Oldřich - Voleník, Karel
Analysis of powder particles of high carbon cast iron after air plasma spraying.
ISIAME 2008. New York: Springer, 2009 - (Kuzmann, E.; Lazar, K.), s. 39-44. ISBN 978-3-642-01369-0.
[International Symposium on the Industrial Applications of the Mossbauer Effect (ISIAME 2008) /7./. Budapest (HU), 17.08.2008-22.08.2008]
R&D Projects: GA AV ČR IAA1041404
Institutional research plan: CEZ:AV0Z20410507; CEZ:AV0Z20430508
Keywords : Plasma spraying * Oxidation * Mössbauer spectroscopy ·
Subject RIV: BM - Solid Matter Physics ; Magnetism

Structure and phase analysis of high carbon cast iron prepared by plasma spraying was performed using X-ray diffraction and Mössbauer spectroscopy. The sprayed powder particles were trapped in liquid nitrogen to fix their composition during the flight from the plasma torch. The results show decarburization and oxidation of the powder. The carbon content decrease is more pronounced on surfaces of the particles. The fresh powder exhibits an anomalous magnetic transition from ferromagnetic to paramagnetic state during the sample cooling from room temperature down to 28 K. This effect was explained as result of high concentration of defects and strains. The long time ageing at room temperature caused transition to more stable phase composition and diminishing of the anomalous magnetic transition.
Permanent Link: http://hdl.handle.net/11104/0184124