Formation and oxidation resistance of a new YSZ modified silicide coating on Mo-based alloy

作者：Cai, Zhenyang; Wu, Yonghuang; Liu, Huyun; Tian, Gengyu; Pu, Rong; Piao, Shengming; Tang, Xinyang; Liu, Sainan^*; Zhao, Xiaojun^*; Xiao, Lairong^*

来源：Materials and Design, 2018, 155: 463-474.

DOI：10.1016/j.matdes.2018.06.011

• Molybdenum-based alloy
• Silicide coating
• Oxidation
• YSZ
• MoSi2
• Ultra-high temperature

A new YSZ (yttria stabilized zirconia) modified silicide coating was prepared on Mo-based alloy through a twostep process, including spraying of Si-Mo-YSZ slurry followed by reaction sintering. Microstructure and oxidation behavior of the coatings with different YSZ content (0, 5, 10 and 15%) were studied. The coating consists of a MoSi2-ZrSi2-SiO2 outer layer and a MoSi2 inner layer. The 10% YSZ modified coating possessed the best oxidation protection at ultra-high temperatures and, for the coating, themass gainwas 0.96 mg/cm(2) after being exposed at 1725 degrees C in air for 22 h, whereas the uncoated Mo-based alloy completely ablated for 0.35 h. The excellent oxidation resistance of the silicide coating was attributed to the compact and self-healing SiO2 protective scale, which contained the dispersed ZrO2 and ZrSiO4.

• 出版日期2018-10-5
• 单位中南大学