Please guide me in calculating Gibbs free energy for Co6W6C, W2C, Co3W3C, Co7W6, Fe6W6C phases?
Dear Dr. Mannaerts, I do not have they enthalpy values. I would be grateful if you can help.
I am sorry, but I dont have those enthalpy values either. You may have to make an effort to find them in the literature, assuming they are not in the NIST database. .
There is a brandnew paper available on the thermodynamics of your system Fe-W-Co-C, which contains the relevant references of subsystems, but also critical Gibbs energy parameters of the extension: P. Zhou et al., Int. Journal of Refractory Metals and Hard Materials 54 (2016) 60–69. If you ask these authors, they maybe provide the thermodynamic CALPHAD database for you, and you can extract any thermodynamic state variables by using thermodynamic software such as Thermocalc, PanDat or MatCalc. If you have further questions on how to perform the calculations, I can help you with that. If you cannot obtain the parameters I can also help you.
Dear Dr. Erwin,
I would be grateful to you if you could help me with the Gibbs free energy values of the above mentioned phases. I went through the paper you mentioned. But I do not have the access to Thermocalc and neither I know how to use it also. Therefore, I would really appreciate your help in knowing the values. If you want I can mail you the formation reactions of the above mentioned phases.
Anticipating you response.
With best regards,
Sunny Zafar
Thermochemical data for W2C (and WC) is available from: O. Kubaschewski, C.B. Alcock, P.J. Spencer, "Materials Thermochemistry", 6th ed., Pergamon Press, 1993, p. 319.
Of seemingly possible interest, concerning to the question subject ― Thermochemical data for Co3W is available at: M. Kh. Karapet'yants, M. L. Karapet'yants, "Handbook of Thermodynamic Constants of Inorganic and Organic Compounds", Ann Harbour— Humphrey Science Publishers, London, 1970.
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