TY - JOUR
T1 - Thermodynamic and experimental study of carbon formation on carbides under hydrothermal conditions
AU - Jacobson, Nathan S.
AU - Gogotsi, Yury G.
AU - Yoshimura, Masahiro
PY - 1995/1/1
Y1 - 1995/1/1
N2 - Thermodynamic analyses for the corrosion of SiC, TiC, TaC, NbC, WC and B4C in the temperature range 300-1000 °C in high-pressure steam have been conducted using a Gibbs energy minimization computer code. The calculated results are compared to experimental results for corrosion of these carbides in a hydrothermal fluid above the critical point. The formation of carbon has been predicted and observed for all these carbides, except B 4C. Carbon is formed at low H2O: carbide molar ratios. Lower pressure also promotes carbon formation. For a high H2O: carbide molar ratio, the carbon will be oxidized to CO and CO2. The hydrothermal method can be used for producing carbon coatings of nanometre to micrometre thickness on the surface of carbides.
AB - Thermodynamic analyses for the corrosion of SiC, TiC, TaC, NbC, WC and B4C in the temperature range 300-1000 °C in high-pressure steam have been conducted using a Gibbs energy minimization computer code. The calculated results are compared to experimental results for corrosion of these carbides in a hydrothermal fluid above the critical point. The formation of carbon has been predicted and observed for all these carbides, except B 4C. Carbon is formed at low H2O: carbide molar ratios. Lower pressure also promotes carbon formation. For a high H2O: carbide molar ratio, the carbon will be oxidized to CO and CO2. The hydrothermal method can be used for producing carbon coatings of nanometre to micrometre thickness on the surface of carbides.
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U2 - 10.1039/jm9950500595
DO - 10.1039/jm9950500595
M3 - Article
AN - SCOPUS:0001189690
VL - 5
SP - 595
EP - 601
JO - Journal of Materials Chemistry
JF - Journal of Materials Chemistry
SN - 0959-9428
IS - 4
ER -