The melt self-quenching technique has been used to examine the metastable solid solution extension of mullite formed from rapidly solidified A12O3 • SiO2 melts. Increasing melt cooling rates were seen to increase the A12O3 content of mullite, decrease the amount of mullite precipitating, and decrease the melt compositional range over which mullite forms. The maximum mullite A12O3 content achieved was 77.3 mol % for cooling rates between 103 and 105 K/s. The highest A12O3 content mullite also exhibited very similar a0 and b0lattice parameters indicating a structure close to tetragonal symmetry (equilibrium mullite is orthorhombic).
All Science Journal Classification (ASJC) codes
- Materials Science(all)
- Condensed Matter Physics
- Mechanics of Materials
- Mechanical Engineering