The effect of TiO2 additions on CaO–MgO–Al2O3–SiO2 (CMAS) crystallization behavior from the melt
Abstract
Titania (TiO2) was introduced into a model calcium‐magnesium aluminosilicate (CMAS) glass in additions of 5‐20 wt%. The crystallization behavior of the mixtures was characterized over a series of temperature profiles and compared to that of CMAS alone. X‐ray diffraction, differential scanning calorimetry, light and scanning electron microscopy, and energy dispersive spectroscopy were used to characterize glass and crystalline products. Titania additions in the amount of approximately 12.5‐20 wt% aided in the formation of CaTiO3 from melts equilibrated at either 1300 or 1500°C and cooled at 10°C/min. Holding CMAS + TiO2 (TiO2 ≥ 10 wt%) at 900°C after cooling from 1300/1500°C resulted in the formation of additional crystalline phases including melilite, paqueite, and diopside. Implications for CMAS interactions with thermal and environmental barrier coatings are discussed.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Nov 19, 2018
- Source ID
- 10.1111/jace.16180
Entities
People
- Elizabeth J. Opila
- Rebekah I. Webster
Organizations
- Office of Naval Research
- University of Virginia