Interdiffusion in the carbides of the Nb-C system

Journal Article · Sat Oct 31 23:00:00 EST 1998 · Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science

DOI:https://doi.org/10.1007/s11661-998-0312-x· OSTI ID:290262

Woodford, J; Chang, Y A ^[1]

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1. Univ. of Wisconsin, Madison, WI (United States). Materials Science and Engineering Dept.

Interdiffusion coefficients in Nb{sub 2}C and NbC{sub 1{minus}x} were measured using bulk diffusion couples in the temperature range from 1,400 C to 1,700 C. Marker experiments were used to show that carbon is the only component undergoing significant diffusion in both carbides. Carbon concentrations were measured by difference using electron probe microanalysis, and interdiffusion coefficients were taken from Boltzmann-Matano analyses of the resulting concentration profiles. This analysis clearly showed that, in NbC{sub 1{minus}x}, interdiffusion coefficient varies with carbon concentration.

• Sponsoring Organization: USDOE
• OSTI ID: 290262
• Journal Information: Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science, Journal Name: Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science Journal Issue: 11 Vol. 29; ISSN MMTAEB; ISSN 1073-5623
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CARBON
ELECTRON MICROPROBE ANALYSIS
NIOBIUM CARBIDES
SELF-DIFFUSION
TEMPERATURE RANGE 1000-4000 K