Study of Surface Modification of Niobium Caused by Nitriding and Cathodic Cage Deposition

Macedo, Francisco R. C.; Monção, Renan M.; Queiroz, José C. A.; Libório, Maxwell S.; Costa, José A. P.; Rossino, Luciana S.; Danelon, Miguel R.; Feitor, Michelle C.; Costa, Thércio H. C.; Sousa, Rômulo R. M.

doi:10.1590/1980-5373-MR-2022-0613

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Articles • Mat. Res. 26 • 2023 • https://doi.org/10.1590/1980-5373-MR-2022-0613 copy

Study of Surface Modification of Niobium Caused by Nitriding and Cathodic Cage Deposition

Authorship SCIMAGO INSTITUTIONS RANKINGS

In this work, plasma nitriding (PN) and cathode cage plasma deposition (CCPN) treatments were carried out with temperatures of 400 and 450 °C to evaluate the modifications caused on the surface of pure niobium samples. XRD, SEM, Vickers microhardness, and sphere-disk analyses were used to characterize the coatings’ composition, morphology, hardness, and wear resistance. The results showed that the treated samples increased hardness and wear resistance, with the sample submitted to CCPN at 450 °C presenting the best tribological behavior.

Keywords:
Niobium nitride; nitriding; plasma deposition; wear resistance

Samples	PN treatment		CCPD treatment
Samples	PN400	PN450	CCPD400	CCPD450
Temperature (°C)	400	450	400	450
Gases (sccm)	48 $N_{2}$ / 12 $H_{2}$	48 $N_{2}$ / 12 $H_{2}$	48 $N_{2}$ / 12 $H_{2}$	48 $N_{2}$ / 12 $H_{2}$
Pressure (Pa)	600	600	200	200
Time (hours)	4	4	4	4

Samples	Thickness (μm)	Standard deviation (μm)
PN400	7.49	0.87
PN450	7.89	0.35
CCPD400	0.82	0.50
CCPD450	8.02	0.51

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