Ion nitriding of titanium and zirconium by a dc-glow discharge method. [Surface phases]

Journal Article · Wed Mar 01 04:00:00 EST 1978 · High Temp. Sci.; (United States)

OSTI ID:6299083

Liu, M B; Gruen, D M; Krauss, A R; Reis, Jr, A H; Peterson, S W

Nitrided surfaces of titanium and zirconium were prepared by operating a dc-glow discharge in a mixture of 20% N/sub 2/ and 80% H/sub 2/ at 20 to 40 Torr. The discharge was confined between a stainless steel anode and the sample at about 500 mA with a dc potential of 360 to 400 V. The temperature of the sample was about 900/sup 0/C. The kinetics of metal nitride formation are enhanced by about a factor of three in the dc discharge technique compared with either rf discharge of thermal nitriding methods. The golden-yellow nitrided surfaces were characterized by energy-dispersive x-ray and electron diffraction techniques. The results show that the nitrided surfaces contain mononitride phases. Depth-profile measurements were performed by argon-ion etching and surface analysis by means of XPS. The kinetics of the formation of surface nitride layers are discussed in terms of a reaction involving nitrogen--hydrogen molecular ions with the substrate. Diffusion of nitrogen into the bulk determines the rate of growth of the nitride layer. 20 references.

• Research Organization: Argonne National Lab., IL
• OSTI ID: 6299083
• Journal Information: High Temp. Sci.; (United States), Journal Name: High Temp. Sci.; (United States) Vol. 10:1; ISSN HITSA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360101* -- Metals & Alloys-- Preparation & Fabrication
360201 -- Ceramics
Cermets
& Refractories-- Preparation & Fabrication
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
COHERENT SCATTERING
CRYSTAL GROWTH
DIFFRACTION
DIFFUSION
ELECTRIC DISCHARGES
ELECTRON DIFFRACTION
ELEMENTS
GLOW DISCHARGES
KINETICS
METALS
NITRIDATION
PHASE STUDIES
REACTION KINETICS
SCATTERING
SURFACES
TITANIUM
TRANSITION ELEMENTS
X-RAY DIFFRACTION
ZIRCONIUM