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CHAPTER 3 RESEARCH PROPOSAL SEM emits a focused electron beam to irradiate the sample and release the characteristic X-rays. The composition and concentration can be confirmed by analysing the characteristic X-rays. The main difference between XRF and EDX is the radiation resource using to hit the sample. XRF uses X-ray and EDX uses electron beam. Due to the larger size of radiation resource, XRF is able to do the larger area (28 mm2) of measurement which is more suitable to find out the general composition of volcanic ash. Once better understanding of the volcanic ash has been established, it will allow us to determine experimental parameters for the subsequent TBC testing. 2. Study the CMAS-induced TBC degradation by the use of volcanic ash, In this part, the TBC samples used are 8 wt.% YSZ deposited by EB-PVD on a nickel-based superalloy. To begin with, TBCs surface is covered with a thin layer of volcanic ash, before heating samples in a furnace at 1250 °C for different exposure times. SEM and energy dispersive X-ray spectroscopy (EDX) will be used to analyse the degradation of YSZ top coat by volcanic ash. In addition, molar ratio of zirconium, yttrium, and oxygen would be measured using EDX point analysis, and the ratio change of Y2O3 in TBC samples after different hours of thermal exposure would also be calculated using following formula: Y2O3(wt%) = XYMY + 1.5(XyMO) [XZrMZr + 2(XZrMO)] + [XYMY + 1.5(XyMO)] (X=molar ratio, M= atomic mass, MY=88.90585, MZr=91.224, MO=15.9994) 3. Penetration test of volcanic ash in different materials Page 44PDF Image | Volcanic Ash Degradation on Thermal Barrier Coatings
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