Manufacturing of End Blade of Large Turbine Engine in Investment Casting with Rapidly Dried Sol Silicate

Liu Xianfu~1 Li Yanping~2

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Manufacturing of End Blade of Large Turbine Engine in Investment Casting with Rapidly Dried Sol Silicate
Issue 9, Pages: 555-557(2005)
Published： 2005 ，
DOI：

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[1]柳贤福,李彦平.用快干硅溶胶生产大型汽轮机导叶片的精铸工艺[J].特种铸造及有色合金,2005(09):555-557+511.

Liu Xianfu~1 Li Yanping~2. Manufacturing of End Blade of Large Turbine Engine in Investment Casting with Rapidly Dried Sol Silicate. [J]. Special Casting & Nonferrous Alloys (9):555-557(2005)
[1]柳贤福,李彦平.用快干硅溶胶生产大型汽轮机导叶片的精铸工艺[J].特种铸造及有色合金,2005(09):555-557+511. DOI：

Liu Xianfu~1 Li Yanping~2. Manufacturing of End Blade of Large Turbine Engine in Investment Casting with Rapidly Dried Sol Silicate. [J]. Special Casting & Nonferrous Alloys (9):555-557(2005) DOI：

摘要

介绍采用FOSECO公司生产的DCOAT快干硅溶胶制壳工艺替代硅溶胶-硅酸乙酯复合制壳工艺

生产长为950mm、毛坯质量达42kg的汽轮机弯扭导叶片的制壳工艺

并对DCOAT快干硅溶胶的快干机理和影响型壳性能的因素进行了探讨。DCOAT快干硅溶胶采用水溶性高聚物增强

在湿度为30%

0%、风速为6

m/s的干燥条件下

层间干燥时间仅为1

h。DCOAT快干硅溶胶型壳湿强度和高温强度高

残留强度低

透气性好

已成功应用于汽轮机大型叶片的批量生产。

Abstract

Stainless steel blade of turbine engine with 950mm length and 42 kg weight was manufactured by adopting D-COAT rapidly dried sol silicate instead of sol silicate-ethyl silicate to make compound shell.The rapidly dried mechanism of the D COAT sol silicate and the factors influencing shell mold properties were investigated.The layer-drying time only need 1～2 h under the condition of 30%～40% humidity and 6～8 m/s wind speed due to use soluble high polymeric substance reinforcement in D COAT sol silicate.The D COAT sol silicate has the features of low residual strength and high green strength in shell mold and high temperature strength as well as good permeability

successfully applied for the production of large blade of turbine engine.