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Mold shell for directional solidification of high-inertia TiAl alloy and preparation method of mold shell
The invention provides a mold shell for directional solidification of a high-inertia TiAl alloy and a preparation method of the mold shell. The mold shell sequentially comprises a surface layer, a transition layer and a back layer from inside to outside, the surface of the surface layer is filled with a yttrium oxide sand layer, the surface of the transition layer is filled with a yttrium oxide sand layer, the surface of the back layer is filled with a zirconium oxide sand layer, and all the sand layers are tightly combined without cracks. According to the mold shell coating, yttrium oxide is adopted as a surface layer and transition layer refractory material, zirconium oxide is adopted as a back layer refractory material, and yttrium sol is adopted as a binder; meanwhile, the dispersing agent, the surfactant and the defoaming agent of specific types and proportions are added, so that the slurry is uniform and good in wettability, pores and bubbles of a mold shell are effectively eliminated, and the surface compactness and inertia of the mold shell are improved. The mold shell provided by the invention is thin in thickness, good in uniformity, high in compactness and good in melt reactivity resistance, is suitable for precise casting process preparation of high-activity alloys such as TiAl alloys, and has important industrial application value.
本发明提供了一种高惰性TiAl合金定向凝固用模壳及其制备方法。本发明提供的模壳由内至外依次为面层、过渡层和背层，所述面层表面填充有氧化钇砂层，所述过渡层表面填充有氧化钇砂层，所述背层表面填充有氧化锆砂层，各砂层结合紧密无裂纹。本发明模壳涂料时采用氧化钇作为面层和过渡层耐火材料，氧化锆作为背层耐火材料，钇溶胶为粘结剂；同时加入特定种类及配比的分散剂、表面活性剂和消泡剂，使得浆料均匀、润湿性好、有效消除了型壳的孔隙和气泡，增加模壳的表面致密性和惰性。本发明提供的模壳厚度薄、均匀性好、致密性高且抗熔体反应性好，适用于TiAl合金等高活性合金精密铸造工艺制备，具有重要的工业应用价值。
Mold shell for directional solidification of high-inertia TiAl alloy and preparation method of mold shell
The invention provides a mold shell for directional solidification of a high-inertia TiAl alloy and a preparation method of the mold shell. The mold shell sequentially comprises a surface layer, a transition layer and a back layer from inside to outside, the surface of the surface layer is filled with a yttrium oxide sand layer, the surface of the transition layer is filled with a yttrium oxide sand layer, the surface of the back layer is filled with a zirconium oxide sand layer, and all the sand layers are tightly combined without cracks. According to the mold shell coating, yttrium oxide is adopted as a surface layer and transition layer refractory material, zirconium oxide is adopted as a back layer refractory material, and yttrium sol is adopted as a binder; meanwhile, the dispersing agent, the surfactant and the defoaming agent of specific types and proportions are added, so that the slurry is uniform and good in wettability, pores and bubbles of a mold shell are effectively eliminated, and the surface compactness and inertia of the mold shell are improved. The mold shell provided by the invention is thin in thickness, good in uniformity, high in compactness and good in melt reactivity resistance, is suitable for precise casting process preparation of high-activity alloys such as TiAl alloys, and has important industrial application value.
本发明提供了一种高惰性TiAl合金定向凝固用模壳及其制备方法。本发明提供的模壳由内至外依次为面层、过渡层和背层，所述面层表面填充有氧化钇砂层，所述过渡层表面填充有氧化钇砂层，所述背层表面填充有氧化锆砂层，各砂层结合紧密无裂纹。本发明模壳涂料时采用氧化钇作为面层和过渡层耐火材料，氧化锆作为背层耐火材料，钇溶胶为粘结剂；同时加入特定种类及配比的分散剂、表面活性剂和消泡剂，使得浆料均匀、润湿性好、有效消除了型壳的孔隙和气泡，增加模壳的表面致密性和惰性。本发明提供的模壳厚度薄、均匀性好、致密性高且抗熔体反应性好，适用于TiAl合金等高活性合金精密铸造工艺制备，具有重要的工业应用价值。
Mold shell for directional solidification of high-inertia TiAl alloy and preparation method of mold shell
一种高惰性TiAl合金定向凝固用模壳及其制备方法
DING XIANFEI (author) / LIU HAN (author) / HUANG HONG (author) / ZONG XIAO (author) / HU HAITAO (author) / NAN HAI (author)
2023-06-13
Patent
Electronic Resource
Chinese
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