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<p>In order to fabricate the high-quality gas turbine blades, the ceramic shell materials must be carefully selected with low reactivity and appropriate wettability between molten superalloy. The sessile-drop experiment was employed to systematically investigate the interfacial reaction and wettability between the 4716CC2 superalloy and Al<sub>2</sub>O<sub>3</sub>-based ceramic shell at various temperatures in this study. The wetting behavior and interfacial reaction products at different temperatures were analyzed by using SEM, EDS, and XRD, respectively. The interfacial reaction process and products were discussed, and the effect of casting temperature on the wettability and interfacial reaction was investigated. The results demonstrate that the wetting behavior and interfacial reaction between the 4716CC2 superalloy and Al<sub>2</sub>O<sub>3</sub>-based ceramic shell are significantly influenced by casting temperature. The wettability angle of the melted 4716CC2 superalloy with the ceramic shell initially decreased and then increased with rising temperature, reaching a maximum of 130° at the temperature of 1480&#xa0;°C and a minimum of 105.8° at the temperature of 1520&#xa0;°C. The experimental results indicated that the chemical reaction between the 4716CC2 superalloy and the Al<sub>2</sub>O<sub>3</sub>-based ceramic shell was sensitive to temperature. The interfacial reaction is weak at 1480&#xa0;°C, with reaction products of SiO<sub>2</sub>, Al<sub>2</sub>O<sub>3</sub>, and the most intense interfacial reaction occurred at 1520&#xa0;°C with the main reaction products being SiO<sub>2</sub>, Al<sub>2</sub>O<sub>3</sub>, HfO<sub>2</sub>, and Ta<sub>2</sub>O<sub>5</sub>, and enrichment of Co elements near the reaction layer on the alloy surface.</p>

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Effect of Casting Temperature on the Wettability and Interfacial Reaction between 4716CC2 Superalloy and Ceramic Shell

  • 期刊论文

  • 发表日期：

    2025年10月2日

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  • Qiongyuan Zhang,
  • Qiang Yang,
  • Atao Yang,
  • Yingxin Wang,
  • Lin Wu,
  • Haiyang Song,
  • Yu Fang,
  • Qingyan Xu

摘要

In order to fabricate the high-quality gas turbine blades, the ceramic shell materials must be carefully selected with low reactivity and appropriate wettability between molten superalloy. The sessile-drop experiment was employed to systematically investigate the interfacial reaction and wettability between the 4716CC2 superalloy and Al2O3-based ceramic shell at various temperatures in this study. The wetting behavior and interfacial reaction products at different temperatures were analyzed by using SEM, EDS, and XRD, respectively. The interfacial reaction process and products were discussed, and the effect of casting temperature on the wettability and interfacial reaction was investigated. The results demonstrate that the wetting behavior and interfacial reaction between the 4716CC2 superalloy and Al2O3-based ceramic shell are significantly influenced by casting temperature. The wettability angle of the melted 4716CC2 superalloy with the ceramic shell initially decreased and then increased with rising temperature, reaching a maximum of 130° at the temperature of 1480 °C and a minimum of 105.8° at the temperature of 1520 °C. The experimental results indicated that the chemical reaction between the 4716CC2 superalloy and the Al2O3-based ceramic shell was sensitive to temperature. The interfacial reaction is weak at 1480 °C, with reaction products of SiO2, Al2O3, and the most intense interfacial reaction occurred at 1520 °C with the main reaction products being SiO2, Al2O3, HfO2, and Ta2O5, and enrichment of Co elements near the reaction layer on the alloy surface.