Improvement of Tribological Behavior of Ti–6Al–4V Alloy Using Nanostructured NbSi2 and NbSi2–Al2O3 Plasma Spray Coatings

Abstract

Ti-6Al-4V alloys are widely used in aerospace industries because of their high specific strength. However, they have poor wear resistance. Plasma spray coatings were investigated as a way to improve the wear resistance of this alloy. In this paper, nanostructured NbSi 2 and NbSi 2 -Al 2 O 3 coatings were employed to enhance the tribological properties of Ti-6Al-4V. Atmospheric plasma spraying process was used for coating deposition. The structural transformation of coatings was examined by X-ray diffraction test. The pin-on-disk tribometer was used to carry out wear tests under dry sliding conditions and the worn surfaces and wear debris were examined by scanning electron microscopy , compositional analyses and microhardness tests. The tribological test results showed that for the investigated conditions, both coatings had satisfactory values of friction and wear resistance and they could be suitable candidates for Ti-6Al-4V material. Finally, it was concluded that NbSi 2 -Al 2 O 3 nanocomposite coated sample showed maximum hardness and highest wear resistance.

Tungsten Carbide-Nickel (WC-Ni) Coating as Potential Wear and Corrosion Protection for Metal

“…It shows that the HVOF wear resistance is slightly higher than the ED coating. It has been generally noted on the relation of high hardness with high wear resistance [21]. Thus, the high hardness of HVOF coating contributes to the low wear rate showing high wear resistance than the ED coating.…”

Investigation on the Trajectory Planning of Spray Gun of Spray Robot and Its Spraying Effect

“…Its advantages can be shown in following several aspects: (1) the large flexibility and wide working scope; (2) improving the spraying quality, spraying efficiency and material utilization; (3) easy operation and maintenance, and off-line programming; (4) the high utilization rate. Due to the programming ability, the spraying robot is applied to all kinds of situations, such as the automotive coating industry [12][13] and aerospace coating industry [14][15]. In the automotive coating industry, the automobile front cover, bumper, luggage, engine parts and other components can be sprayed.…”