Microstructure of high velocity oxy-fuel sprayed Ti2AlC coatings
Artikel i vetenskaplig tidskrift, 2010

The microstructure formation and phase transformations in Ti2AlC-rich coatings deposited by High Velocity Oxy-fuel spraying of Maxthal 211(A (R)) powders is presented. High resolution electron microscopy analysis, using both scanning and transmission electron microscopy with energy dispersive spectrometry and energy filtering, combined with X-ray diffraction reveals that the coatings consist of Ti2AlC grains surrounded by regions of very small TiC grains embedded in Ti (x) Al (y) . The composition of the Ti (x) Al (y) depends on its surrounding and varies with size and distribution of the adjacent TiC grains. Impact of spray parameters on coating microstructure is also discussed. Two spray parameters were varied; powder size distribution and flame power. They were found to greatly affect the coating microstructure. Increasing powder size and decreasing flame power increase the amount of Ti2AlC, but produces thinner coatings with lower cohesion. Larger powder size will also decrease oxygen incorporation.

THIN-FILMS

SOLIDS

TEM

TI

ELECTRON-MICROSCOPY

HIGH-TEMPERATURE

AIR

ALLOY

Författare

Marie Sonestedt

Chalmers, Teknisk fysik, Mikroskopi och mikroanalys

J. Frodelius

Linköpings universitet

J. P. Palmquist

Kanthal AB

H. Hogberg

Linköpings universitet

L. Hultman

Linköpings universitet

Krystyna Marta Stiller

Chalmers, Teknisk fysik, Mikroskopi och mikroanalys

Journal of Materials Science

0022-2461 (ISSN) 1573-4803 (eISSN)

Vol. 45 10 2760-2769

Ämneskategorier

Materialteknik

DOI

10.1007/s10853-010-4263-4