High-temperature interactions of desert sand CMAS glass with yttrium disilicate environmental barrier coating material
-
Add time:07/30/2019 Source:sciencedirect.com
A calcium-magnesium aluminosilicate (CMAS) glass was prepared by melting a sample of desert sand to evaluate the high-temperature interactions between molten CMAS and yttrium disilicate (Y2Si2O7), an environmental barrier coating (EBC) candidate material. Cold-pressed pellets of 80 wt% Y2Si2O7 powder and 20 wt% CMAS glass powder were heat treated at 1200 °C, 1300 °C, 1400 °C and 1500 °C for 20 h in air. The resulting phases were evaluated using powder X-ray diffraction. In the second set of experiments, free standing hot-pressed Y2Si2O7 substrates with cylindrical wells were filled with CMAS powder to a loading of ~35 mg/cm2 and heat treated in air at 1200 °C, 1300 °C, 1400 °C and 1500 °C for 20 h. Scanning electron microscopy, energy-dispersive spectroscopy and electron microprobe analysis were used to evaluate the microstructure and phase compositions of specimens after heat treatment. An oxyapatite silicate (Ca2Y8(SiO4)6O2) phase was identified in all specimens after CMAS exposure regardless of heat treatment temperature. Apatite appeared to form by dissolution of Y2Si2O7 into molten CMAS, reacting with CaO in the melt according to the reaction 4Y2Si2O7 + 2CaO → Ca2Y8(SiO4)6O2 + 2SiO2, and followed by precipitation of the apatite phase.
We also recommend Trading Suppliers and Manufacturers of aluminium potassium disilicate (cas 12068-38-1). Pls Click Website Link as below: cas 12068-38-1 suppliers
Prev:Evaluation of the ceramic liner bonding effect between zirconia and lithium disilicate
Next:Understanding the mechanism for the mechanical property degradation of a lithium disilicate glass-ceramic by annealing) - 【Back】【Close 】【Print】【Add to favorite 】
- Related Information
- Influence of ZrO2 on the crystallization and properties of lithium disilicate glass-ceramics derived from a multi-component system08/06/2019
- Studies of crystal phase formations in high-strength lithium disilicate glass–ceramics08/05/2019
- Synthesis and properties of lithium disilicate glass-ceramics in the system SiO2–Al2O3–K2O–Li2O08/04/2019
- Controlled precipitation of lithium disilicate (Li2Si2O5) and lithium niobate (LiNbO3) or lithium tantalate (LiTaO3) in glass-ceramics08/03/2019
- Strengthening of a lithium disilicate glass-ceramic by rapid cooling08/02/2019
- The effect of Ca2+ and Al3+ additions on the stability of potassium disilicate glass as a soot oxidation catalyst08/01/2019
- Understanding the mechanism for the mechanical property degradation of a lithium disilicate glass-ceramic by annealing07/31/2019
- Evaluation of the ceramic liner bonding effect between zirconia and lithium disilicate07/29/2019
- Mechanical and bioactive properties of lithium disilicate glass-ceramic mixtures synthesized by two different methods07/28/2019
-
Health and Chemical more >