Mikrostruktura powłok cermetalowych natryskiwanych metodą płomieniowo-proszkową
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Abstract
W artykule przedstawiono wyniki badań mikrostruktury powłok natryskiwanych metodą płomieniowo-proszkową mieszaninami proszków NiMoAl/ZrO2-30% CaO oraz NiAlMo/Al2O3-40% TiO2. Skład fazowy określono metodą XRD i wykazano, że w powłoce ZrO2 30% CaO występują fazy ZrO2 oraz CaZrO3, a w powłoce Al2O3-40% TiO2 β tytanian glinu, korund, rutyl. Porowatość powłok cermetalowych zależała od składu proszków zastosowanych do natryskiwania. Wartości parametrów struktury geometrycznej powierzchni malały ze wzrastającą zawartością materiału ceramicznego. Dodanie do materiału bazowego tworzącego osnowę cermetalu niewielkiej ilości innego materiału zmienia mechanizm formowania powłoki.
Microstructure of flame sprayed cermet coatings
Abstract
The paper presents results of microstructural investigations of coatings flame sprayed with the mixtures of powders nimoAl/ZrO2-30% CaO and niAlmo/Al2O3-40% TiO2. Phase composition was evaluated by means of the XRD method. The phases which appear in the ZrO2-30% CaO coating are ZrO2 and CaZrO3, whereas in the Al2O3-40% TiO2 coating β aluminium titanate, corundum and rutile. Porosity of cermet coatings depends on the composition of powders used for spraying. The values of parameters describing the geometrical structure of the coating surface decreased with increasing ceramic content. The admixture of low content of other material to the matrix- creating base material changes the mechanism of the coating formation.
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