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首页> 外文会议>Asian Thermal Spray Conference >Effect of sintering and phase transformation on the microstructure and mechanical properties of plasma-sprayed 8YSZ and 20YSZ coatings
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Effect of sintering and phase transformation on the microstructure and mechanical properties of plasma-sprayed 8YSZ and 20YSZ coatings

机译：烧结和相变对等离子体喷涂8倍和20苏斯涂层微观结构和力学性能的影响

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Plasma-sprayed YSZ coatings, serving as thermal insulating top coats for thermal barrier coatings, involve thermal activated microstructure evolution, which may change the physical and mechanical properties and thereby influence the thermal barrier performance and service lifetime. In this study, 8YSZ and 20YSZ coatings annealed at 1300°C were comparatively investigated to understand the effects of sintering and phase transformation on the microstructure and mechanical properties. Results show that the as-sprayed 8YSZ coating presented a multi-phase structure including M, T(T') and C phases, and significant phase transformation from T(T') to C and M phases occurred. However, the as-sprayed 20YSZ coating exhibited C phase. The lamellar bonding was significantly improved within 100 h due to the sintering effect of both 8YSZ and 20YSZ coatings. Shrinkage in both in-plane and through-thickness directions was observed, although 8YSZ expanded during the annealing for >150 h. Both microhardness and elastic modulus increased with annealing duration. Based on these results, it is concluded that sinter effects, rather than phase transformation effects, dominate the microstructure evolution in early stage annealing. In addition, the relatively low sintering kinetics of 8YSZ coating is possibly attributed to the multi-phase structure.
机译：等离子体喷涂的YSZ涂层，用作热阻挡涂层的热绝缘顶部涂层，涉及热活化的微观结构演化，这可以改变物理和机械性能，从而影响热屏障性能和使用寿命。在本研究中，在1300℃下退火的8毫秒和20苏斯涂层相对调查，以了解烧结和相变对微观结构和机械性能的影响。结果表明，喷雾的8倍涂层呈现了包括M，T（T'）和C相的多相结构，并且发生了从T（T'）至C和M相的显着相变。然而，喷涂的20苏斯涂层表现出C相。由于80SZ和20苏斯涂层的烧结效果，拉链粘合在100小时内显着改善。观察到在平面内和穿过厚度方向上的收缩，尽管在退火时膨胀> 150小时，但是80Sz膨胀。微硬度和弹性模量随着退火持续时间而增加。基于这些结果，得出结论，烧结效应，而不是相变效应，主导了早期退火的微观结构演变。此外，8€涂层的相对低的烧结动力学可能归因于多相结构。

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