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The wettability of SrAl2Si2O8 (SrASi), BaAl2Si2O8 (BASi) and Sr4Al6O12SO4 (SAlSr) plasma-sprayed coatings on mullite substrates by an Al-12Si alloy at 1000°C was studied using the sessile drop technique. All the coatings showed high adherence to the substrate. The SrASi and BASi coatings were mainly amorphous with some monoclinic crystallites of SrAl2Si2O8 and BaAl2Si2O8, respectively. The SAlSr coating...