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<p>This study investigates the slurry erosion performance of three ceramic coatings, namely, Cr<sub>2</sub>O<sub>3</sub>, Al<sub>2</sub>O<sub>3,</sub> and Al<sub>2</sub>O<sub>3</sub> + 13TiO<sub>2</sub> sprayed onto the 13Cr4Ni (CA6NM) turbine steel using the detonation gun (D-Gun) coating spray method under accelerated hydro-erosive conditions. The coatings were characterized to analyze their micro-structural and mechanical properties. Results indicate that, among all the as-sprayed coatings, the Al<sub>2</sub>O<sub>3</sub> coating have shown the highest erosion rate, whereas the Cr<sub>2</sub>O<sub>3</sub> coating alone has exhibited the lowest erosion rate. The coating’s erosion resistance is primarily influenced by its increased microhardness, lower porosity, and dense microstructure. Additionally, the scanning electron microscopy (SEM) study of the eroded specimens reveals that the Al<sub>2</sub>O<sub>3</sub> + 13TiO<sub>2</sub> and Al<sub>2</sub>O<sub>3</sub> coatings exhibited brittle behavior. In contrast, the&#xa0;Cr<sub>2</sub>O<sub>3</sub> coating has shown mixed behavior.</p>

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A Comparative Experimental Study of CA6NM Turbine Steel Protection by Thermal-Sprayed Ceramic Coatings under Accelerated Conditions

  • 期刊论文

  • 发表日期：

    2026年2月22日

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  • Vibhu Sharma,
  • Sanjeev Bhandari,
  • Harpreet Singh,
  • Virat Khanna

摘要

This study investigates the slurry erosion performance of three ceramic coatings, namely, Cr2O3, Al2O3, and Al2O3 + 13TiO2 sprayed onto the 13Cr4Ni (CA6NM) turbine steel using the detonation gun (D-Gun) coating spray method under accelerated hydro-erosive conditions. The coatings were characterized to analyze their micro-structural and mechanical properties. Results indicate that, among all the as-sprayed coatings, the Al2O3 coating have shown the highest erosion rate, whereas the Cr2O3 coating alone has exhibited the lowest erosion rate. The coating’s erosion resistance is primarily influenced by its increased microhardness, lower porosity, and dense microstructure. Additionally, the scanning electron microscopy (SEM) study of the eroded specimens reveals that the Al2O3 + 13TiO2 and Al2O3 coatings exhibited brittle behavior. In contrast, the Cr2O3 coating has shown mixed behavior.