ENGIN 45 Study Guide - Midterm Guide: Phase Diagram, Smoke Detector, 3I
Document Summary
Industrial applications of refractories for thermal protection include a large quantity of ceramics based upon the mgo-al2o3 ceramic alloy system. Using the grid below, construct the magnesia alumina binary alloy phase diagram from the following experimental observations. Be sure to label all single phase fields: pure magnesia melts at 2800 c, pure alumina melts at 2054 c, magnesia can dissolve up to 2% alumina, the maximum solubility occurring at 2000 c. 40% alumina (at 2000 c) to 84% alumina (at 1800 c). 100% magnesia, and spinel, with a composition 50% magnesia: at 1000 c, a 77% alumina alloy has equal parts alumina phase and spinel phase, the latter with a composition of 54% alumina. 2. !kinetics (20 points: a 1080 steel is austenitized at 800 c for 4 hours in preparation for an isothermal treatment to develop a uniform microstructure of 100% fine pearlite.
