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Fabrication of In Situ ZrCp Incorporated Spherical Al2O3–ZrO2 Eutectic Powder via a Designed Plasma Treatment Process
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DOI：10.1111/jace.70966.png)
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Abstract
En 中文
Dense and spherical Al2O3–ZrO2–ZrCp ceramic powder was prepared by plasma treating YSZ–Al–SiC reactive precursor and air–water double cooling. The Al2O3–ZrO2 matrix was composed of fine-grain columnar alumina-rich structures and nanoeutectic with a phase spacing smaller than 50 nm. In situ and compatible compositing of submicron ZrC particles within the oxide matrix was achieved via thermite-reactive synthesis triggered by rapid plasma heating. A suitable particle size range of the reactive precursor, 30∼45 µm, was distinguished after plasma treatment for the preparation of the effectively treated powder. Phase evolutions from the precursor to the final powder were analyzed using X-ray diffraction, Raman, and FT-IR methods. The preservation of a refined microstructure and good compatibility between the carbide and the oxide matrix in the as-prepared powder can be attributed to the proper design of the reactive system and effective control of cooling.
Keywords:
alumina–zirconia eutectic
plasma treatment
reactive synthesis
zirconium carbide
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3.8
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