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
哈工大郑州研究院,郑州 450000;哈尔滨工业大学 材料结构精密焊接与连接全国重点实验室,哈尔滨 150001 哈尔滨工业大学 材料结构精密焊接与连接全国重点实验室,哈尔滨 150001 河南省科学院材料研究所,郑州 450046 格力电器（郑州）有限公司,郑州 450066 卧龙电气南阳防爆集团股份有限公司,河南 南阳 473000
2025-04-02
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
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.%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,op-timize the mechanical properties and high temperature oxidation resistance of TiAl welding,and explore the efficient prepara-tion technology.With Ti-48Al-2Cr-2Nb,Ti3AlC2 and Sn powder as raw materials,2wt.%Sn was introduced to promote sinter-ing 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 sur-face 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 microal-loying significantly improve the density,mechanical properties and oxidation resistance of TiAl based composites.SPS tech-nology is an efficient means to prepare high-performance TiAl matrix composites,which provides a new idea for its application in high-end equipment.
