THERMODYNAMICS OF GAS-SOLID REACTION UNDER HIPING CONDITIONS

摘要

Ellingham diagrams are very powerful phase diagrams to evaluate equilibrium phases under gas-solid reactions. Those phase diagrams were extended to higher pressures to examine stable phases under high total gas pressures. The variables under consideration consist not only of temperature and partial pressure of a gas involving the chemical reactions, but also total gas pressures. These new phase diagrams are applied to predict stable phases under hot isostatic pressing conditions (HIP phase diagram). Silicon nitride sintering, aluminium nitride sintering, oxide super conductors sintering and borosilicate glass melting were discussed as examples of HIP phase diagram.