Microstructure and Properties Development During Thermal Treatments of Ti3SiC2/TiC Coating Produced by Denotation Spraying onto Carbon Steel Grade U9

It is known that Ti
3
SiC
2
is the only stable ternary compound in the Ti-Si-C system that demonstrates a good microstructure-properties relationship. The production of Ti-C-Si by detonation spraying technique results in the formation of multilayer Ti
3
SiC
2
/TiC coating. This transformation is due to the deintercalation of Si from Ti
3
SiC
2
that enlarges after heat treatment. This article provides investigations on the effect of middle-temperature annealing on the structural-phase state, mechanical and tribological properties of Ti
3
SiC
2
/TiC coatings obtained by the detonation spraying method. After annealing, the formation of [110], [211] and [301] reflections of TiO
2
phases and an increase in the intensity of [103] and [108] reflections of Ti
3
SiC
2
phases are observed. The maximum hardness of 1400 HV obtained for the coating annealed to 800° C. A similar tendency observed during adhesion tests. An increase in annealing temperature to 800° C, improves the adhesion strength of the coating to 13.2 N. Meanwhile the value of COF remains stable for as-deposited and annealed coating. The property improvements are due to the formation of denser structure and oxideTiO
2
films.