| 引用本文: | 吴海华,李涤尘,邢建东.快速铸造收缩-扩张形气膜孔空心涡轮叶片[J].材料科学与工艺,2011,19(6):143-148.DOI:10.11951/j.issn.1005-0299.20110626. |
| WU Hai-hua,LI Di-chen,XING Jian-dong.Rapid casting of hollow turbine blades with converging-expanding film cooling holes[J].Materials Science and Technology,2011,19(6):143-148.DOI:10.11951/j.issn.1005-0299.20110626. |
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| 摘要: |
| 本文将光固化成形技术和凝胶注模成形技术集成在一起,间接自由成形了带有收缩-扩张形气膜孔空心涡轮叶片整体式陶瓷铸型.通过建立收缩-扩张形气膜孔型芯干燥收缩受阻模型,推导了临界干燥收缩率计算公式,实验研究了凝胶注模成型坯体冻干特性.结果表明:冻干收缩率随着失水程度增加而增大,在失去约50%水分之后,干燥收缩停止;预冻温度越低,冻干收缩率越小.采取合理的冻干工艺对干燥收缩率进行控制,保证陶瓷铸型结构的完整性,快速铸出涡轮叶片,验证了新工艺的可行性和有效性. |
| 关键词: 空心涡轮叶片 快速铸造 冷冻干燥 临界收缩率 凝胶注模成型 |
| DOI：10.11951/j.issn.1005-0299.20110626 |
| 分类号:TG249.5 |
| 基金项目:国家重点基础研究发展计划资助项目(2007CB707704);中国博士后科学基金资助项目(20100471615) |
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| Rapid casting of hollow turbine blades with converging-expanding film cooling holes |
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WU Hai-hua, LI Di-chen, XING Jian-dong
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State Key Laboratory of Manufacturing Systems Engineering,Xi’an Jiaotong Univetsity, Xi’an 710049,China
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| Abstract: |
| In this paper,a novel indirect solid freeform fabrication process was developed by combining gelcasting with stereolithography(SL) technique to manufacture integral ceramic casting molds for hollow turbine blades with converging-expanding film cooling holes.Based on the model of hindered drying shrinkage,a calculation formula of critical drying shrinkage was derived.Through experimental research,freeze-drying characteristics of gelcasting green bodies were discovered.The freeze-drying shrinkage was increased with water lose degree.After losing about 50 percent of water,the green body stopped shrinking.With the decrease of pre-freezing temperature,the freeze-drying shrinkage reduced.A suitable lyophilization process was adopted to control the freeze-drying shrinkage,and the structural integrity of ceramic casting mold was maintained.A rapid casting case study was presented to verify the feasibility and effectiveness of the proposed process. |
| Key words: hollow turbine blade rapid casting freeze drying critical drying shrinkage gelcasting |
