The aim of this research work is the adjustment of the conventional investment casting process for the single crystal casting of thin-walled near net shape specimen with cast wall thickness down to 0.4 mm. Polymer models for manufacturing of shell molds for investment casting of Ni-based superalloys were produced by additive manufacturing from three different thermosets and one thermoplastic. Temperature dependent mass change, thermal expansion and burnout behavior of the polymers were investigated. All thermosets turned out to have inappropriate burnout behavior due to high thermal expansion. Smoothed polyvinyl butyral (PVB) could be burned out without cracking the shell mold. High quality thin-walled single crystal Ni-based superalloy M247LC was cast successfully in shell molds manufactured using polyvinyl butyral (PVB) models which were subsequently burned out and thereafter the shell molds were sintered.

这项研究工作的目的是调整常规熔模铸造工艺，以铸造薄壁近净形试样，并将铸造壁厚降低至0.4毫米。通过三种不同的热固性塑料和一种热塑性塑料的增材制造工艺，生产出用于镍基超合金熔模铸造的壳模制造用聚合物模型。研究了聚合物的温度依赖性质量变化，热膨胀和燃尽行为。事实证明，由于高的热膨胀性，所有热固性塑料都具有不适当的烧毁行为。可以将光滑的聚乙烯醇缩丁醛（PVB）烧掉而不会破裂外壳模具。