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Měření tvrdosti nehomogenních plazmových nástřiků
Čtvrtlík, Radim ; Stranyánek, Martin ; Boháč, Petr ; Jastrabík, Lubomír ; Hrabovský, Milan ; Ctibor, Pavel
Paper deals with testing of mechanical properties of plasma sprayed coatings TiO2 by Depth Sensing Indentation performed on measuring system NanoTest 600™. The NT600™ is a modular measuring instrument with unique design, which applies the loading force in horizontal direction. The platform can measure and evaluate hardness, elastic modulus, adhesion, wear, fracture and also dynamic properties. In the last years the new plasma spraying technology of ceramic and ceramic-metal materials has became as very convenient technique in many industrial and reconstruction processes. The investigated samples of plasma sprayed coatings were prepared in Institute of Plasma Physics of the Academy of Sciences of the Czech Republic. The goal of this paper is to contribute to deepening the knowledge in local distribution of mechanical properties in plasma sprayed coatings, especially of hardness and elastic modulus.
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Properties of ceramic membranes prepared from thermal-plasma-spheroidized particles
Ctibor, Pavel
Powder particles introduced into thermal plasma are melted and accelerated by hot plasma-jet core in the form of spheroidal droplets.They could be captured in a liquid orin a vessel placed in proper distance from the plasma jetto obtain solidified droplets.In such a way several kilo grams per hour of powder composed of spheroized particles("free-flight particles") could be obtained if water-stabilized plasma system is used.
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Plasma Spraying as a Technique for Dielectric Ceramics Preparation
Ctibor, Pavel ; Rohan, Pavel ; Kolman, Blahoslav Jan ; Dubský, Jiří ; Chráska, Pavel
This paper reports on plasma spraying of several synthetic titanetes.Ceramic materials CaTiO3-LaMg0,5Ti0,5O3,Zr0, 8Sn0,2TiO4 as well as mixture of geikielite-perovskite MgTiO3-CaTiO3 were sprayed using gas stabilized plasma gun.These materials are well know as microwave dielectrics. Plasma spraying was performed with the gas stabilized plasma gun Plasmatechnik HB4.Standard experimental techniques were used for studying of microstructure, chemical and
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Electric Resistivity of Plasma Deposited Titanates
Ctibor, Pavel ; Sedláček, J.
This work representes first output from a broader study of dielectric properties of plasma deposits made from powder with the same starting composition as industrially produced dielectric ceramics.Influence of plasma spraying itself and of the subsequent annealing of sprayed deposits on electric resistivity of several titanates is reported here.Only a small number of papers exist about the dielectric properties of thermally sprayed deposits,but on the
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