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Al2 O3 型壳与 DZ125 高温合金的润湿性及 界面反应研究
Research on Wetting Behaviors and Interfacial Reactions between Al 2 O 3 -based Ceramic Shells and DZ125 Superalloys
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- DOI:
- 作者:
- 王石磊 1 ， 李治辉 2 ，张洪雪 1 ，李 波 1 ，李 飞 2 ，陈晓燕 2 ，赵彦杰 2 ，
WANG Shilei 1 , LI Zhihui 2 , ZHANG Hongxue 1 , LI Bo 1 , LI Fei 2 , CHEN Xiaoyan 2 , ZHAO Yanjie 2
- 作者单位:
- 1 . 中国航发沈阳黎明航空发动机有限责任公司，辽宁 沈阳 110041；2. 上海交通大学 材料科学与工程学院 上海市先进 高温材料及其精密成型重点实验室，上海 200240
1. AECC Shenyang Liming Aero-Engine Co., Ltd., Shenyang 110041, China; 2. Shanghai Key Laboratory of High-temperature Materials and Precision Forming, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
- 关键词:
- Al2 O3 型壳； DZ125 合金；润湿性；界面反应
Al2 O3 -based ceramic shell; DZ125 superalloy; wetting behavior; interfacial reaction
- 摘要:
- DZ125 合金因其优异的性能和较低的成本被广泛用于航空发动机的涡轮叶片。 航空发动机涡轮叶片通常由熔模铸造技术制备，而陶瓷型壳是熔模铸造技术的基础和保障。 陶瓷型壳与高温合金的润湿性及界面反应是高温合金涡轮叶片表面质量及尺寸精度的重要影响因素。 以电熔白刚玉粉、 EC95 粉和电熔白刚玉砂为原料，以 1030C 硅溶胶为粘结剂，设计了涡轮叶片定向凝固成型用陶瓷型壳浆料配方，并制备了陶瓷型壳。 在研究 Al 2 O 3 型壳的微观结构和表面粗糙度的基础之上，重点研究了 Al 2 O 3 型壳与 DZ125 高温合金的润湿性及界面反应。 结果表明，制备的 Al 2 O 3 型壳具有光滑平整的表面，表面粗糙度达 1.973 μm ； Al 2 O 3 型壳对 DZ125 高温合金具有良好的惰性，两者的润湿角为 119.54° ；DZ125 合金表面发生了轻微的化学粘砂，粘砂层厚度仅约 0.5 μm ，化学反应产物主要为合金元素 Ta 、 Cr 、 W 和 Ti 的氧化物。 Al 2 O 3 型壳与 DZ125 高温合金的界面处化学粘砂被有效抑制的主要原因为 Al 2 O 3 型壳的光滑平整表面及其对DZ125 高温合金展现出良好的不润湿性。DZ125 superalloys are widely used in aeroengine turbine blades because of their excellent performance and low cost. Aeroengine turbine blades are usually prepared by investment casting, of which ceramic shells are the basis. The wetting angle and interfacial reactions between the ceramic shell and superalloy are key factors affecting the quality and dimensional accuracy of superalloy turbine blades. In this paper, using white fused corundum powder, EC95 powder, and white corundum sand as raw materials and silica sol as a binder, the slurry composition of ceramic shell was designed for the directional solidification molding of turbine blades, and the ceramic shell was then prepared. The microstructure and surface roughness of the Al 2 O 3 -based ceramic shell were studied, and the wetting behavior and interfacial reaction between the Al 2 O 3 -based ceramic shell and DZ125 superalloy were analysed. The results show that the prepared Al 2 O 3 -based shell has a smooth surface and that the surface roughness is 1.973 μm. The Al 2 O 3 -based shell shows excellent inertia to the DZ125 superalloy, and the wetting angle reaches 119.54°. The DZ125 superalloy shows slight chemical sand adhesion, and the thickness of the sand layer is only approximately 0.5 μm. The chemical reaction products are mainly oxides of Ta, Cr, W and Ti. The slight chemical sand adhesion of the DZ125 superalloy is attributed to not only the smooth surface of the Al2 O3 -based shell but also the excellent nonwetting performance of the Al 2 O 3 -based shell to DZ125 superalloy.