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CHAPTER 5 CHARACTERIZATION OF PROTECTIVE COATING MATERIALS volcanic ash penetration. According to Aygun et al. [43], CaO-SiO2-Al2O3 the ternary phase diagram shown in Figure 5.5 demonstrates that typical CMAS is located into pseudo-wollastonite field, whose glass composition is difficult to crystallize. It has been reported that, the crystals of pseudo-wollastonite start to change abnormally and rapidly hundreds of degrees below its melting point (1544 °C [74]) [75]. However, the difficult-to-crystallize pseudo-wollastonite would transform to a crystallisable anorthite by providing alumina, and the physical properties of anorthite are much stable at high temperature. Thus, it can be note that Al2O3 provides a good ability to mitigate volcanic ash and CMAS penetration. Figure 5.5 CaO-SiO2-Al2O3 ternary phase diagram [43] Page 75PDF Image | Volcanic Ash Degradation on Thermal Barrier Coatings
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