Articles
  • Preparation and Hydro Thermal Corrosion Resistance of Silicon Nitride with Lu-Si-O EBC Layer at High Temperature 
  • Shunkichi Ueno*, D. Doni Jayaseelan, Tatsuki Ohji, Naoki Kondo and Shuzo Kanzaki
  • Synergy Materials Research Center, National Institute of Advanced Industrial Science and Technology, 2268-1 Shimo-Shidami, Moriyama-ku, Nagoya 463-8687, Japan
Abstract
A highly dense Lu-Si-O EBC (environmental barrier coating) layer was successfully coated on silicon nitride ceramics by a sputtering method. A Lu2Si2O7/Lu2SiO5 complex composition layer was obtained by heat treatment at 1450°C in air. Hydro corrosion tests were performed at 1300°C for 100 hours in a 30 wt% water vapor environment. The highly dense Lu2Si2O7/ Lu2SiO5 EBC layer protected the silicon nitride from corrosion by water vapor attack. The weight loss of this sample at 1.1 × 10−6 g/cm2·h, was similar to that of a hot pressed Lu2Si2O7 which showed a weight loss of 1.4 × 10−6 g/cm2·h. On the other hand, the weight of a silicon nitride ceramic with no EBC layer increased by 1.2 × 10−4 g/cm2·h.

Keywords: EBC, Lu2Si2O7, water vapor corrosion

This Article

  • 2003; 4(4): 214-216

    Published on Dec 31, 2003

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