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| 放电等离子烧结制备Sn微合金化Ti3AlC2/TiAl复合材料的微观组织演变和力学性能 |
| Microstructure Evolution and Mechanical Properties of Sn Microalloyed Ti3AlC2/TiAl Composites Prepared by Spark Plasma Sintering |
| Received:January 02, 2025 |
| DOI：10.3969/j.issn.1674-6457.2025.03.011 |
| 中文关键词: 放电等离子烧结 微合金化 TiAl基复合材料 微观组织 力学性能 |
| 英文关键词: spark plasma sintering microalloying TiAl matrix composites microstructure mechanical properties |
| 基金项目:国家自然科学基金(U21A20128，52175302，U22A20185，52305353) |
| Author Name | Affiliation | | HE Peng | Zhengzhou Research Institute, Harbin Institute of Technology, Zhengzhou 450000, China
State Key Laboratory of Precision Welding and Joining of Materials and Structures, Harbin Institute of Technology, Harbin 150001, China | | LI Xinyue | State Key Laboratory of Precision Welding and Joining of Materials and Structures, Harbin Institute of Technology, Harbin 150001, China | | LONG Fei | Institute of Materials, Henan Academy of Sciences, Zhengzhou 450046, China | | LIN Panpan | Zhengzhou Research Institute, Harbin Institute of Technology, Zhengzhou 450000, China
State Key Laboratory of Precision Welding and Joining of Materials and Structures, Harbin Institute of Technology, Harbin 150001, China | | WANG Ce | Zhengzhou Research Institute, Harbin Institute of Technology, Zhengzhou 450000, China
State Key Laboratory of Precision Welding and Joining of Materials and Structures, Harbin Institute of Technology, Harbin 150001, China | | SHI Qingqing | Inc.of Zhengzhou, Gree Electric Appliances, Zhengzhou 450066, China | | ZHAO Yan | Wolong Electric Nanyang Explosion Protection Group Co., Ltd., Henan Nanyang 473000, China | | LIN Tiesong | Zhengzhou Research Institute, Harbin Institute of Technology, Zhengzhou 450000, China
State Key Laboratory of Precision Welding and Joining of Materials and Structures, Harbin Institute of Technology, Harbin 150001, China |
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| 中文摘要: |
| 目的 采用放电等离子烧结(SPS)法，引入增强相Ti3AlC2制备Ti3AlC2/TiAl复合材料，添加Sn元素进行微合金化并加速复合材料烧结致密化过程，优化TiAl合金的力学性能和高温抗氧化性能，并探索高效制备技术。方法 以Ti-48Al-2Cr-2Nb、Ti3AlC2和Sn粉为原料，通过引入2%(质量分数)Sn元素，促进烧结致密化并降低烧结温度，在900~1 300 ℃的温度范围内烧结，研究不同烧结条件下材料的微观组织和力学性能，并对900 ℃高温抗氧化性能进行评估。结果 未添加Sn元素时，复合材料孔隙较多，致密度为92.3%，添加Sn元素后，致密度提高至99.5%。复合材料的抗压强度和压缩率随着烧结温度的升高而增大，在1 300 ℃/50 MPa/10 min的烧结条件下，复合材料的抗压强度和压缩率分别达1 672 MPa和21.4%。在900 ℃氧化300 h后，复合材料表面形成致密的Al2O3保护层，阻止O原子进一步向基体扩散，氧化增重仅为1.37%，显著低于Ti-48Al-2Cr-2Nb合金的2.94%。结论 增强相Ti3AlC2的引入和Sn微合金化显著提升了TiAl基复合材料的致密性、力学性能和抗氧化性。SPS技术是一种高效制备高性能TiAl基复合材料的手段，为其在高端装备中的应用提供了新思路。 |
| 英文摘要: |
| The work aims to prepare Ti3AlC2/TiAl composites by introducing the strengthening phase Ti3AlC2 according to spark plasma sintering (SPS), add Sn for microalloying and accelerating the sintering densification process of the composite, optimize the mechanical properties and high temperature oxidation resistance of TiAl welding, and explore the efficient preparation technology. With Ti-48Al-2Cr-2Nb, Ti3AlC2 and Sn powder as raw materials, 2wt.% Sn was introduced to promote sintering densification and reduce sintering temperature. The microstructure and mechanical properties of materials under different sintering conditions were studied by sintering at 900-1 300 ℃. The oxidation resistance at 900 ℃ was evaluated. Without Sn, there were more pores in the composite, and the density was 92.3%, while the density increased to 99.5% after Sn was added. The compressive strength and compression ratio of the composite increased with the increase of sintering temperature. Under the sintering condition of 1 300 ℃/50 MPa/10 min, the compressive strength and compression ratio of the composite reached 1 672 MPa and 21.4%, respectively. After 300 h of oxidation at 900 ℃, a dense Al2O3 protective layer was formed on the surface of the composite to prevent O atoms from further diffusing to the matrix, and the oxidation weight gain was only 1.37%, which was significantly lower than the 2.94% of Ti-48Al-2Cr-2Nb alloy. In conclusion, the addition of Ti3AlC2 and Sn microalloying significantly improve the density, mechanical properties and oxidation resistance of TiAl based composites. SPS technology is an efficient means to prepare high-performance TiAl matrix composites, which provides a new idea for its application in high-end equipment. |
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