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<p>Environmental barrier coatings (EBCs) are necessary to achieve the long life required of SiC/SiC ceramic matrix components (CMCs) in the hot section of gas turbine engines. The most common EBC material in use today is ytterbium disilicate (Yb<sub>2</sub>Si<sub>2</sub>O<sub>7</sub>) and has been the benchmark protection system since the early 2000s. As CMC use expands, the demand for EBC deposition and processing control will grow accordingly. Novel methods such as plasma spray-physical vapor deposition (PS-PVD) are also being evaluated for their capabilities in EBC deposition. Ytterbium disilicate powder was deposited on SiC substrates via PS-PVD to evaluate the effects of carrier gas chemistry and flow as well as torch traverse speed and powder injector orientation. Coating microstructure and phase were evaluated using x-ray diffraction and scanning electron microscopy. A range of coating compositions were generated, including a mixture of ytterbium monosilicate (Yb<sub>2</sub>SiO<sub>5</sub>) with the disilicate as well as configurations with excess silica (SiO<sub>2</sub>).</p>

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Parameter Exploration of Yb2Si2O7 Coatings Prepared by Plasma Spray Physical Vapor Deposition (PS-PVD)

  • 期刊论文

  • 发表日期：

    2025年12月18日

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  • J. R. Colmenares,
  • B. J. Harder,
  • L. C. Hoffman

摘要

Environmental barrier coatings (EBCs) are necessary to achieve the long life required of SiC/SiC ceramic matrix components (CMCs) in the hot section of gas turbine engines. The most common EBC material in use today is ytterbium disilicate (Yb2Si2O7) and has been the benchmark protection system since the early 2000s. As CMC use expands, the demand for EBC deposition and processing control will grow accordingly. Novel methods such as plasma spray-physical vapor deposition (PS-PVD) are also being evaluated for their capabilities in EBC deposition. Ytterbium disilicate powder was deposited on SiC substrates via PS-PVD to evaluate the effects of carrier gas chemistry and flow as well as torch traverse speed and powder injector orientation. Coating microstructure and phase were evaluated using x-ray diffraction and scanning electron microscopy. A range of coating compositions were generated, including a mixture of ytterbium monosilicate (Yb2SiO5) with the disilicate as well as configurations with excess silica (SiO2).