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Area of Science:

  • Materials Science
  • Ceramic Engineering
  • Nanotechnology

Background:

  • Flame synthesis is a method for producing microspheres.
  • The Y2O3-Al2O3 system has potential applications.
  • Understanding crystallization is key to controlling material properties.

Purpose of the Study:

  • To analyze the crystallization of Y2O3-Al2O3 glass microspheres produced by flame synthesis.
  • To develop growth models for microspheres during and after flame synthesis.
  • To catalog the different crystallized microstructures formed.

Main Methods:

  • Flame synthesis of Y2O3-Al2O3 precursor powders.
  • Detailed analysis using electron microscopy, including electron backscatter diffraction (EBSD).
  • Energy dispersive X-ray spectrometry (EDS) for chemical composition analysis.

Main Results:

  • 16 distinct types of crystallized bodies were identified, including all three binary Y2O3-Al2O3 phases and alpha-alumina.
  • Microsphere chemical composition could deviate from precursor powder nominal compositions.
  • Observed polygon and dendritic crystal growth, and phase separation indicate process variability.

Conclusions:

  • Flame synthesis in the Y2O3-Al2O3 system generates a wide variety of crystallized microsphere structures.
  • Process parameters like flight paths, contaminants, and cooling rates influence microsphere formation.
  • The study provides a catalog of microstructures for future reference and process optimization.