Abstract In this research, Suspension Plasma Spraying (SPS) technique was used for the thermal deposition of a multicomponent mixture made up of an Y-TZP/Al2O3 matrix with SiC particles. Two suspensions of Y-TZP and Al2O3 with different SiC particles content (6 wt% and 12 wt%) were tested as feedstocks in the SPS process. Three stand-off distances were varied in order to assess coating microstructure and evaluate the presence of SiC in the final coatings. Coatings were characterised in terms of porosity, microstructure and phase distribution. The estimate of the amount of SiC in the coating was carried out by XRD technique. Findings showed typical cauliflower-like SPS microstructure which intensifies with stand-off distance. Coatings porosity varied significantly between 8% and 25% whereas minimum porosity was found for the intermedium stand-off distance of 40 mm. Microstructure analysis also revealed the presence of SiC particles in the coatings which was confirmed by EDX analysis, overall XRD tests as well as TG analysis. Finally, evaluation of SiC content in the final coatings by means of XRD analysis showed that most of SiC particles (c.a 80%) of the feedstocks were preserved in the final coatings.

中文翻译：

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多组分亚微米 Y-TZP/Al 2 O 3 /SiC 颗粒悬浮等离子喷涂涂层的微观结构评估

摘要 在这项研究中，悬浮等离子喷涂 (SPS) 技术用于热沉积由 Y-TZP/Al2O3 基体和 SiC 颗粒组成的多组分混合物。测试了两种不同 SiC 颗粒含量（6 wt% 和 12 wt%）的 Y-TZP 和 Al2O3 悬浮液作为 SPS 工艺的原料。为了评估涂层微观结构并评估最终涂层中 SiC 的存在，改变了三个间隔距离。涂层的特征在于孔隙率、微观结构和相分布。涂层中 SiC 的量的估计是通过 XRD 技术进行的。结果显示出典型的花椰菜状 SPS 微观结构，随着距离的增加而加剧。涂层孔隙率在 8% 和 25% 之间变化很大，而在 40 毫米的中间间隔距离中发现孔隙率最小。微观结构分析还表明涂层中存在 SiC 颗粒，这通过 EDX 分析、整体 XRD 测试以及 TG 分析得到证实。最后，通过 XRD 分析对最终涂层中 SiC 含量的评估表明，大部分原料的 SiC 颗粒（约 80%）保留在最终涂层中。