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针对航空空心叶片氧化铝基陶瓷铸型高温性能较差的问题,研究了不同浸渍材料对氧化铝基陶瓷铸型高温性能的影响规律。结果表明:未经强化处理的陶瓷铸型力学性能较差,高温(1 500℃)强度不足0.5MPa,室温(20℃)强度不足10MPa。经硅溶胶、硅酸乙酯水解液、YCl3溶液以及MgCl2溶液4种不同浸渍液强化处理后陶瓷铸型力学性能有不同程度的提高,其中YCl3溶液以及MgCl2溶液强化效果不理想,陶瓷铸型力学性能没有明显改善,且MgCl2溶液浸渍强化后陶瓷铸型存在较大的体积膨胀,不能满足使用要求;硅溶胶、硅酸乙酯水解液浸渍强化可显著改善陶瓷铸型的高温性能,硅溶胶强化处理后,陶瓷铸型1 500℃高温强度可达10MPa左右,满足空心涡轮叶片定向凝固过程中对铸型高温强度的要求。通过复合浸渍的方法制造了一体化陶瓷铸型并成功浇铸了空心涡轮叶片。
Aiming at the poor high temperature performance of alumina hollow ceramic mold for aviation hollow blades, the influence of different impregnated materials on the high temperature performance of alumina based ceramic molds was studied. The results show that the mechanical properties of the untreated ceramic mold are poor, the strength at high temperature (1 500 ℃) is less than 0.5MPa and the strength at room temperature (20 ℃) is less than 10MPa. The mechanical properties of the ceramic mold improved with different concentrations of silica sol, ethyl silicate hydrolyzate, YCl3 solution and MgCl2 solution, and the strengthening effect of YCl3 solution and MgCl2 solution was not satisfactory. The mechanical properties of ceramic mold Performance is not significantly improved, and MgCl2 solution impregnated reinforced ceramic mold has a larger volume expansion, can not meet the requirements; silica sol, ethyl silicate hydrolyzate impregnation can significantly improve the high temperature performance of ceramic molds, silica sol enhanced After treatment, the ceramic mold 1 500 ℃ high temperature strength of up to 10MPa or so, to meet the hollow turbine blade directional solidification process of high temperature strength of the mold requirements. An integrated ceramic mold was fabricated by composite impregnation and hollow turbine blades were successfully cast.