Computer-Based Methods for Thermodynamic Analysis of Materials Processing.

摘要

The data base previously developed for multicomponent Sialon Ceramic phase diagrams has been expanded to cover Ce203, BeO and Y203 additions. Isothermal sections in the MgO-Si3N4-SiO2, Y2O3-Si02-SiN4 and Ce203-Si02-Si3N4 system near 2000 K were computed and compared with limited experimental data. The trajectory of ordering temperatures for A2/B2 and B2/D03 reactions has been computed along the Fe3Si-Fe3A1 composition path in the BCC of the Fe-A1-Si system and compared with experiment. The two phase (fcc & bcc) fields for ordered phases in the iron-aluminum-nickel, iron-aluminum-manganese, and the iron-nickel-manganese system between 700 C and 1200 C. Construction of a data base for fluoride systems consisting of systems containing ZrF4 which are employed tp synthesize fluoride glasses has been initiated and used to calculate the composition of maximum liquid stability in the ZrF4-LaF3-BaF2 and the ZrF4-BaF2-NaF systems where glass formation has been observed. The calculations have been extended to consider the effects of A1F3 additions on the glass compositions with good results. An analysis of the titanium-carbon-nitrogen system coupling the thermochemical and phase diagram data was performed to calculate the ternary phase diagram and thermochemical properties over a range of temperature.