Ti2AlC coatings deposited by High Velocity Oxy-Fuel spraying
Artikel i vetenskaplig tidskrift, 2008

High Velocity Oxy-Fuel has been utilized to spray coatings from Ti2AlC (MAXTHAL 211 (R)) powders. X-ray diffraction showed that the coatings consist predominantly of Ti2AlC with inclusions of the phases Ti3AlC2, TiC, and Al-Ti alloys. The fraction of Ti2AlC in coatings sprayed with a powder size of 38 mu m was found to increase with decreasing power of the spraying flame as controlled by the total gas flow of H-2 and O-2. A more coarse powder (56 mu m) is less sensitive to the total gas flow and retains higher volume fraction of MAX-phase in the coatings, however, at the expense of increasing porosity. X-ray pole figure measurements showed a preferred crystal orientation in the coatings with the Ti2AlC (0001) planes aligned to the substrate surface. Bending tests show a good adhesion to stainless steel substrates and indentation yields a hardness of 3-5 GPa for the coatings sprayed with a powder size of 38 mu m. (c) 2008 Elsevier B.V. All rights reserved.

OXIDATION

Scanning electron microscopy (SEM)

THIN-FILMS

Phase transitions

STABILITY

TI3ALC2

MAX-phase

diffraction

High Velocity Oxy-Fuel (HVOF)

X-ray

TI3SIC2

Författare

J. Frodelius

Linköpings universitet

Marie Sonestedt

Chalmers, Teknisk fysik, Mikroskopi och mikroanalys

S. Bjorklund

Högskolan Väst

J. P. Palmquist

Kanthal AB

Krystyna Marta Stiller

Chalmers, Teknisk fysik, Mikroskopi och mikroanalys

H. Hogberg

Linköpings universitet

L. Hultman

Linköpings universitet

Surface and Coatings Technology

0257-8972 (ISSN)

Vol. 202 24 5976-5981

Ämneskategorier

Annan teknik

DOI

10.1016/j.surfcoat.2008.06.184