Open Access Conference Proceedings

The article presents research findings on the microstructural studies of thermal barrier coatings (TBC) deposited on molybdenum, featuring a bond coat made of molybdenum silicide. Ceramic coatings within the TBC system were produced through plasma spraying in air. Conventional 8YSZ and rare-earth zirconate powders (lanthanum and neodymium zirconates) were utilized to achieve this. The ceramic layer's thickness was measured to be approximately 250 µm. The interlayer consisted of a MoSi2 diffusion coating, formed by the diffusion process during the siliconizing of the molybdenum substrate. Ideally, the thickness of this zone should be around 100 µm. The research scope included a visual characterization of the TBC system to assess its overall integrity. In the second phase of the research, topographic parameters of the surface were evaluated, mainly focusing on the roughness of individual elements within the system. The subsequent assessment highlighted the phase composition of these individual system elements. During the cross-sectional tests, the ceramic layer was evaluated in terms of the architecture of cracks and pores. Quantitative and qualitative assessments were conducted, categorizing the pores as spherical, horizontal, and vertical. The final aspect of the cross-section evaluation was the bond quality between the ceramic layer and the silicide bond coat.

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