(哈尔滨工业大学 材料科学与工程学院，哈尔滨 150001)
摘 要: 选用CaO增强的ZrO2作为TiAl熔模精密铸造用陶瓷型壳的面层材料，通过OM、SEM、EDS和XRD对TiAl合金界面反应处进行形貌分析和元素线扫描分析，研究离心熔模铸造TiAl合金与ZrO2型壳的界面反应。结果表明：在较低的转速(200 r/min)条件下，ZrO2陶瓷与TiAl合金的反应层厚度较小，大约为5 μm；而在较高的转速(400 r/min)情况下，ZrO2陶瓷与TiAl合金的反应层厚度约为20 μm，界面有轻微粘砂。
关键字: TiAl合金；离心熔模铸造；ZrO2型壳；界面反应
（School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China）
Abstract:ZrO2 (CaO stabilized) was chosen as the face coat materials for the investment casting of TiAl alloys. The interfacial reaction between TiAl alloys and ZrO2 ceramic mould under centrifugal investment casting conditions was analyzed through morphological analysis and elemental lines scanning by OM, SEM, EDS and XRD. The results demonstrate that the thickness of reaction layer is relatively small of about 5 μm at low rotational speed of 200 r/min. When the rotational speed increases to 400 r/min, the thickness of reaction layer is estimated to be about 20 μm and the surface exhibits slight metal penetration defect.
Key words: TiAl alloys; centrifugal investment casting; ZrO2 mould; interfacial reaction
