Abstract
Protective SiO 2–Al 2O 3–CaO–Na 2O glass–ceramic based coating produced on TIMETAL 834 by slurry technique was investigated. Analytical scanning and transmission electron microscopy as well as X-ray diffraction were used for detailed analyses of a microstructure and chemical composition of the coating. It was found that the coating contains crystalline phases: CaSiO 3, NaAlSiO 4, Na 2CaSiO 4 and amorphous phase containing mainly O, Si and Al. It was established that glass–ceramic coating formed on TIMETAL 834 essentially improves the alloy selected properties, e.g. its hardness and high temperature oxidation resistance.
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