In situ synthesis of titanium-aluminides in coating with supersonic free-jet PVD using Ti and Al nanoparticles

Ti-Al, Graded Al/AlTi, and Ti-Al-N Coatings Prepared by Supersonic Free-Jet PVD

“…Additional experimental details of the deposition technique were reported in a previous paper. [23][24][25]28) Phases of the coated specimens were identified by X-ray diffraction (XRD) at 30 mA and 15 kV with CuK radiation over a 2 span of 20 to 80 degrees. The phases were identified by matching their characteristic peaks with those in the files of the Joint Committee on Powder Diffraction Standards (JCPDS).…”

“…Thus, suitable fabrication processes for highdensity and thick Ti-Al and Ti-Al-N films have not yet been established. The authors developed supersonic free-jet PVD (SFJ-PVD) [23][24][25][26][27][28][29] as a new coating method in which the coating film is formed by depositing nanoparticles onto the substrate at very high velocity. SFJ-PVD provides a rapid deposition rate and thick film coating.…”

Al/Al-Si Nano-Composite Graded Coating Prepared by Supersonic Free-Jet PVD

“…The further experimental details of the deposition technique were reported in the previous papers. 23,24,26) To form a graded Al/Al-Si coating film on the Al050 substrate, we began evaporating only Al in the evaporation chamber 1, and gradually increased the evaporation rate of Si in the evaporation chamber 2. The composition of the coating film was controlled by electric power for heating applied to each evaporation source.…”

“…Supersonic free-jet physical vapor deposition (SFJ-PVD) [22][23][24][25][26][27][28][29] has been developed as a new coating method in which a coating film is formed by the deposition of nanoparticles onto a substrate at very high velocity. The SFJ-PVD can deposit almost all the evaporated source material as nanoparticles and produce thick coating film.…”

“…The SFJ-PVD can deposit almost all the evaporated source material as nanoparticles and produce thick coating film. In previous works, we have succeeded in obtaining a uniform, high-density and thick Ti-based alloys coating films, such as (1) pure Ti coating films on metal substrates, 22,23) (2) Ti-Al intermetallic compounds coating films in-situ synthesized at low temperature on various metal substrates by mixing Ti and Al nanoparticles, coating films graded from Ti to TiAl and coating films graded from Al to TiAl, 24,25) and (3) monolithic TiN coating films, Ti-Al-N coating films and a coating film graded from Ti to TiN [25][26][27] with SFJ-PVD. The two evaporation chambers of the SFJ-PVD apparatus make possible to produce two different nanoparticles in the respective chambers and to mix them onto a substrate in the deposition chamber with desired composition by controlling the deposition rates of the nanoparticles respectively.…”