Kinetics of Cristobalite Formation in Sintered Silica
Abstract
The kinetics of the cristobalite transformation are reported for sintered silica glass from 1200°C to 1650°C and plotted as a time–temperature–transformation diagram. The 1200°C–1350°C transformation data were fit to the Johnson–Mehl–Avrami–Kolmogorov expression with an time exponent of 3.0 ± 0.6 and an apparent activation energy of 555 ± 24 kJ/mol for the kinetic constant. The temperature of maximum transformation rate was found to fall between 1500°C and 1600°C. Seeding amorphous silica powder with cristobalite resulted in accelerated transformation kinetics. Silica glass powder containing residual quartz had faster transformation kinetics than fully amorphous powder seeded with cristobalite.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Mar 26, 2014
- Source ID
- 10.1111/jace.12889
Entities
People
- John W. Halloran
- Ryan C. Breneman
Organizations
- Georgia Tech
- Office of Naval Research
- University of Michigan