Effect of Si₃N₄ content on microstructures and antioxidant properties of MoSi₂/Si₃N₄ composite coatings on Mo substrate

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• 作者：Yu Huang ; Jia Lin ; Houan Zhang ; ^{ha_zhang@163.com" class="auth_mail" title="E-mail the corresponding author}
• 关键词：A. Sintering ; C. Diffusion ; D. Si3N4 ; E. Substrates
• 刊名：Ceramics International
• 出版年：2015
• 出版时间：December 2015
• 年：2015
• 卷：41
• 期：10
• 页码：13903-13907
• 全文大小：2024 K

文摘

To determine the effective content of Si₃N₄ on microstructures and antioxidant properties of MoSi₂/Si₃N₄ composite coatings on Mo substrate, the MoSi₂–x vol% Si₃N₄/Mo (x=0, 2.0, 3.5, 5.0, and 8.0) diffusion couples were fabricated by spark plasma sintering and annealed at a temperature of 1300 °C for various periods of time up to 168 h. The interfacial diffusion between MoSi₂–Si₃N₄ phase and Mo substrate was examined. Using scanning electron microscopy, the observation of intermediate phases indicated two different mechanisms in Mo₅Si₃ phase growth. The degradation rates of MoSi₂ phase in MoSi₂–x vol% Si₃N₄ diffusion couples were calculated, and the expected Si₃N₄ content of MoSi₂–Si₃N₄ composite coating was 3.5 vol%.