SiO2-ZrO2陶瓷型芯与DZ125,DD5和DD6三种铸造高温合金的界面反应

采用热压注工艺制备以钙稳定氧化锆为矿化剂的SiO2-ZrO2陶瓷型芯试板,继而通过定向凝固分别在1510℃和1530℃制备SiO2-ZrO2型芯与DZ125,DD5和DD6三种高温合金的界面反应空心试板,将空心试板于相同高度处横向剖开,对获得的合金/型芯界面反应试样的微观形貌进行SEM和EDS分析。结果表明,SiO2-ZrO2陶瓷型芯在1500℃以上的高温化学稳定性差,与DZ125,DD5和DD6合金均发生不同程度的界面化学反应,反应产物类型与合金成分密切相关。对于Hf含量较高的DZ125合金来说,合金中Hf与SiO2-ZrO2型芯中的SiO2反应生成HfO2,并在合金表面富集,阻止了合金中A...

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Bibliographic Details
Published in材料工程 Vol. 44; no. 3; pp. 9 - 14
Main Author 王丽丽 李嘉荣 唐定中 刘世忠
Format Journal Article
LanguageChinese
Published 北京航空材料研究院先进高温结构材料重点实验室,北京,100095 2016
Subjects
DD5
DD6
DZ125
SiO2-ZrO2陶瓷型芯
界面反应
钙稳定氧化锆
钙稳定氧化锆
SiO2-ZrO2 based ceramic core
DD5
interfacial reaction
SiO2-ZrO2陶瓷型芯
DD6
DZ125
界面反应
calcium stabled zirconia
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ISSN1001-4381
1001-4381
DOI10.11868/j.issn.1001-4381.2016.03.002

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Summary:采用热压注工艺制备以钙稳定氧化锆为矿化剂的SiO2-ZrO2陶瓷型芯试板,继而通过定向凝固分别在1510℃和1530℃制备SiO2-ZrO2型芯与DZ125,DD5和DD6三种高温合金的界面反应空心试板,将空心试板于相同高度处横向剖开,对获得的合金/型芯界面反应试样的微观形貌进行SEM和EDS分析。结果表明,SiO2-ZrO2陶瓷型芯在1500℃以上的高温化学稳定性差,与DZ125,DD5和DD6合金均发生不同程度的界面化学反应,反应产物类型与合金成分密切相关。对于Hf含量较高的DZ125合金来说,合金中Hf与SiO2-ZrO2型芯中的SiO2反应生成HfO2,并在合金表面富集,阻止了合金中Al与型芯的反应。对于Hf含量较低的DD5,DD6合金来说,合金与SiO2-ZrO2型芯界面反应的产物是Al2O3,其由合金中Al与SiO2反应生成,而矿化剂钙稳定氧化锆对这一界面反应有促进作用。
Bibliography:11-1800/TB
WANG Li-li, LI Jia-rong, TANG Ding-zhong, LIU Shi-zhong （Science and Technology on Advanced High Temperature Structural Materials Laboratory, Beijing Institute of Aeronautical Materials, Beijing 100095,China）
SiO2-ZrO2 based ceramic core plates with calcium stabled zirconia were fabricated by ceramic injection moulding.The hollow interfacial reaction plates of DZ125,DD5 and DD6superalloys were fabricated by directional solidification at 1510℃and 1530℃ using SiO2-ZrO2 based ceramic cores,and the interfacial samples were obtained by horizontally cutting these hollow plates.The microstructure analysis of the interfacial samples shows that the high temperature chemical stability of SiO2-ZrO2 based ceramic core above 1500℃ is poor,due to different chemical reactions with DZ125,DD5 and DD6,and the reaction products are closely related to the compositions of superalloys.For DZ125 superalloy with higher Hf content,the reaction product is HfO2,which is rich on the interface and protects Al in DZ125 superalloy
ISSN:1001-4381
1001-4381
DOI:10.11868/j.issn.1001-4381.2016.03.002