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<p>The quality of the ceramic shell in investment casting is very important, as it determines the quality of the casting. The preparation of ceramic shells, especially the face-coat, using a combination of silica sol and corundum powder, encounters collapsibility. To clarify the influence of the face-coat slurry system, four “silica sol + corundum powder” face-coat slurries were designed and investigated. Based on the selection of 1030C silica sol with high dispersion and stability as the binder, the effects of the microstructure and property of each corundum powder on the stability and coating performance of the face-coat slurry were studied. The results show that the face-coat slurry prepared with lash-shaped corundum powder is more stable than that with ellipsoid corundum powder. The reason lies in the larger specific surface area of lash-shaped corundum powder. The face-coat slurry prepared with lash-shaped corundum powder (D<sub>50</sub>=15&#xa0;μm) with uniform particle-size distribution has excellent stability and coating performance. For example, the coating weight is 36.9&#xa0;mg/cm<sup>2</sup>, the coating thickness reaches up to 186&#xa0;μm, and the solid-to-liquid ratio is up to 3.4:1. Meanwhile, the ceramic shell prepared by lash-shaped corundum powder (D<sub>50</sub>=15&#xa0;μm) has a smooth face-coat surface, high green strength, and excellent nonwettability to superalloys. The surface roughness is low at 1.654&#xa0;μm, which is beneficial to improve the quality of the castings. For DZ125, DD6, and K423A superalloys, the contact angles were up to 119.64°, 128.75°, and 128.10°, respectively. The non-wettability helps hinder the interfacial reactions between ceramic shells and superalloys.</p>

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Research on the Influence of Raw Material Microstructures and Properties on the Quality of the Face-Coat in Ceramic Shell

  • 期刊论文

  • 发表日期：

    2025年4月15日

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  • Zhihui Li,
  • Dawei Guan,
  • Yaozhong Zhang,
  • Fei Li,
  • Shilei Wang,
  • Bo Li,
  • Chunjia Liu,
  • Liangjin Ke,
  • Jixin Chen

摘要

The quality of the ceramic shell in investment casting is very important, as it determines the quality of the casting. The preparation of ceramic shells, especially the face-coat, using a combination of silica sol and corundum powder, encounters collapsibility. To clarify the influence of the face-coat slurry system, four “silica sol + corundum powder” face-coat slurries were designed and investigated. Based on the selection of 1030C silica sol with high dispersion and stability as the binder, the effects of the microstructure and property of each corundum powder on the stability and coating performance of the face-coat slurry were studied. The results show that the face-coat slurry prepared with lash-shaped corundum powder is more stable than that with ellipsoid corundum powder. The reason lies in the larger specific surface area of lash-shaped corundum powder. The face-coat slurry prepared with lash-shaped corundum powder (D50=15 μm) with uniform particle-size distribution has excellent stability and coating performance. For example, the coating weight is 36.9 mg/cm2, the coating thickness reaches up to 186 μm, and the solid-to-liquid ratio is up to 3.4:1. Meanwhile, the ceramic shell prepared by lash-shaped corundum powder (D50=15 μm) has a smooth face-coat surface, high green strength, and excellent nonwettability to superalloys. The surface roughness is low at 1.654 μm, which is beneficial to improve the quality of the castings. For DZ125, DD6, and K423A superalloys, the contact angles were up to 119.64°, 128.75°, and 128.10°, respectively. The non-wettability helps hinder the interfacial reactions between ceramic shells and superalloys.