周士翔,孙冬,陈双,等.激光选区烧结成形涡轮叶片铸造用陶瓷铸型材料及浸渗强化工艺[J].精密成形工程,2024,16(12):82-90.
ZHOU Shixiang,SUN Dong,CHEN Shuang,et al.Laser Selective Sintering of Alumina-based Ceramic Molds for Hollow Turbine Blade Casting and Infiltration Strengthening Process[J].Journal of Netshape Forming Engineering,2024,16(12):82-90. |
| 激光选区烧结成形涡轮叶片铸造用陶瓷铸型材料及浸渗强化工艺 |
| Laser Selective Sintering of Alumina-based Ceramic Molds for Hollow Turbine Blade Casting and Infiltration Strengthening Process |
| 投稿时间：2024-10-08 |
| DOI：10.3969/j.issn.1674-6457.2024.12.006 |
| 中文关键词: 燃气轮机 叶片 铸造 铝基陶瓷铸型 选区激光烧结 |
| 英文关键词: gas turbine blade, casting alumina-based ceramic mold selective laser sintering |
| 基金项目:工业和信息化部“航空发动机与燃气轮机”国家科技重大专项(2017-Ⅶ-0008-0102) |
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| 中文摘要: |
| 目的 针对传统成形方法制备铝基陶瓷铸型加工周期长、难以加工复杂结构等问题，开发新的技术，以一体化制备复杂结构陶瓷铸型。方法 采用激光选区烧结(Selective Laser Sintering，SLS)增材制造技术，一体化成形铝基型芯/型壳铸型。结果 采用球形氧化铝粉体颗粒级配并添加少量气相氧化硅助流剂的方法，不仅提高了粉体的松装密度和流动性，还显著提升了陶瓷生坯的烧结性能。此外，将硅溶胶和氧化铝亚微米陶瓷粉体配制成浸渗溶液，依次对铝基陶瓷素坯和脱脂后陶瓷生坯浸渗，可大幅提升其力学性能。SLS成形铝基铸形烧结后x/y轴方向收缩率仅为1.5%，z轴收缩率约为2.0%，室温和1 550 ℃高温抗弯强度达(29.84±6.06)MPa和(18.10±1.25)MPa，蠕变为0.01%。结论 利用该铝基陶瓷铸型成功铸造出单晶/柱晶涡轮叶片。结果表明，经原料和工艺优化，可实现高性能复杂结构陶瓷铸型的一体化制备。 |
| 英文摘要: |
| The work aims to develop a new forming technology to integrally fabricate complex-shaped alumina-based ceramic mold, so as to solve the problems of long processing cycle and difficult processing of complex structures of aluminum-based ceramic molds prepared by traditional forming methods. The selective laser sintering (SLS) additive manufacturing technology was adopted to integrate the formation of a alumina-based ceramic core containing a shell, that is, the integrated core/shell mold. By grading spherical Al2O3 powder particles with different particle sizes and adding a small amount of gas-phase SiO2 flow aid, the loose density and flowability of the composite powders were improved and the sintering performance of alumina-based ceramic green-bodies was significantly enhanced. In addition, a infiltration solution was prepared by mixing silica sol and Al2O3 submicron ceramic powders. The SLS formed alumina-based ceramic green-body and the alumina-based ceramic brown-body after debinding were sequentially infiltrated into the above solution, which greatly improved the mechanical properties. For the SLS formed sintered alumina-based ceramic mold, the line shrinkage at x/y axis direction was only 1.5%, along with a shrinkage of about 2.0% at the z axis direction, the room-temperature bending strength reached (29.84±6.06) MPa, the high-temperature bending strength at 1 550 ℃ reached (18.10±1.25) MPa and the creep deformation at 1 550 ℃ was 0.01%. Finally, single crystal/columnar crystal turbine blades are successfully cast by the SLS formed alumina-based casting. The results indicate that the high-performance and complex-shaped alumina-based ceramic mold can be fabricated through the synergistic optimization of raw materials and processes. |
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