材料科学
熔模铸造
泥浆
陶瓷
填料(材料)
复合材料
胶体二氧化硅
铸造
表面粗糙度
壳体(结构)
膨润土
冶金
涂层
化学工程
工程类
模具
作者
Y. Venkat,K.R. Choudary,Deepak Kumar Das,Akash Pandey,Sarabjit Singh
标识
DOI:10.1016/j.ceramint.2021.06.161
摘要
Ceramic shell moulds for investment casting of shrouded low-pressure turbine (LPT) blades were prepared by using colloidal silica binder and partial substitution of the zircon filler with fine alumina. Among the two ceramic slurry systems designed, the first slurry system comprised of polymer-free colloidal silica binder, and the second slurry system comprised of polymer-containing colloidal silica binder. The samples prepared from the first slurry system showed higher fired residual strength and self-load sag values (lesser sag resistance). The casting of shrouded LPT blades was carried out at 1525 °C and 1550 °C using CM247LC superalloy. Ceramic shell moulds prepared from the second slurry system, containing 30 wt% of fine alumina filler, yielded aeronautical grade casting (at 1550 °C) of blades with required dimensional accuracy and average surface roughness. Microstructural analysis of the cut surfaces of self-load sag tested samples was carried out to understand the effect of fine alumina substitution on shell characteristics.
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