TY - JOUR
T1 - Phase relationships in the Ti-Si-C system at high pressures
AU - Sambasivan, S.
AU - Petuskey, William
N1 - Funding Information:
We thank Dr. J. R. Holloway (Departments of Chemistry and Geology, Arizona State University) for many helpful discussions and for allowing us the use of his high-pressure equipment. We gratefully acknowledge the United States Army Research Office for financial support provided under Grant DAAL 0388K0098. We also thank J. Clark for his assistance with the electron probe work supported under Grant EAR-8408163.
PY - 1992/6
Y1 - 1992/6
N2 - The compatibility of phases in the Ti-Si-C system was studied for pressures from 10 to 20 kbars (1 to 2 GPa) and temperatures from 1200 °C to 1500 °C via an interfacial reaction between titanium and silicon carbide. The interface was characterized by backscattered electron imaging and electron probe microanalysis. Ti3Si was stabilized at high pressures exhibiting an appreciable solubility for carbon (up to 9 at. %). At higher temperatures and lower pressures, it decomposed to Ti5Si3, Ti(Si, C), and TiCx according to the relation Ti3Si (Cz) = (0.70588)TiCx + (0.32437)Ti5Si3 + (0.67227)Ti (Si,C), where the mathematical coefficients were calculated using z = 0.4 and x = 0.5. No detectable quantities of carbon dissolved in Ti5Si3 under these conditions. A clapeyron slope of 0.08 (±0.01) kbar/K was measured for this reaction. The microstructure of the reaction zone and other general thermodynamic and kinetic characteristics are discussed for different experimental conditions.
AB - The compatibility of phases in the Ti-Si-C system was studied for pressures from 10 to 20 kbars (1 to 2 GPa) and temperatures from 1200 °C to 1500 °C via an interfacial reaction between titanium and silicon carbide. The interface was characterized by backscattered electron imaging and electron probe microanalysis. Ti3Si was stabilized at high pressures exhibiting an appreciable solubility for carbon (up to 9 at. %). At higher temperatures and lower pressures, it decomposed to Ti5Si3, Ti(Si, C), and TiCx according to the relation Ti3Si (Cz) = (0.70588)TiCx + (0.32437)Ti5Si3 + (0.67227)Ti (Si,C), where the mathematical coefficients were calculated using z = 0.4 and x = 0.5. No detectable quantities of carbon dissolved in Ti5Si3 under these conditions. A clapeyron slope of 0.08 (±0.01) kbar/K was measured for this reaction. The microstructure of the reaction zone and other general thermodynamic and kinetic characteristics are discussed for different experimental conditions.
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U2 - 10.1557/JMR.1992.1473
DO - 10.1557/JMR.1992.1473
M3 - Article
AN - SCOPUS:0026872343
SN - 0884-2914
VL - 7
SP - 1473
EP - 1479
JO - Journal of Materials Research
JF - Journal of Materials Research
IS - 6
ER -