Pore structure of reactively synthesized nanolaminate Ti3SiC2 alloyed with Al |
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Affiliation: | 1. College of Material Science and Engineering, Zhejiang University of Technology, Hangzhou, 310014, PR China;2. State Key Laboratory of Powder Metallurgy, Central South University, Changsha, 410083, PR China;1. School of Materials Science and Engineering, China University of Mining and Technology, Xuzhou 221116, China;2. State Key Laboratory of Porous Metal Materials, Northwest Institute for Non-ferrous Metal Research, Xi’an 710016, China;3. Department of Engineering Sciences and Mathematics, Luleå University of Technology, Luleå SE-97187, Sweden;1. State Key Laboratory of Powder Metallurgy, Central South University, Changsha, 410083, China;2. School of Chemistry and Biology Engineering, Changsha University of Science and Technology, Changsha, 410114, China |
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Abstract: | Ti3SiC2 has the unique properties integrating the advantages of metals and ceramics, and good open pore structure when alloyed with Al. In this work, porous Ti3SiC2 compounds with different Al/Si atom ratios were prepared through the reactive synthesis of elemental powders at 1300 °C. The results indicate that the phase compositions are determined by Al element mole number, and that the pore structure can be controlled through varying Ti particle size. The MAX phase transits from Ti3SiC2 with Al element mole number no more than 0.6 to Ti3AlC2 with Al element mole number in the range of 0.8–1.2. When Al element mole number is 0.6, the porous compound has a single MAX phase of Ti3SiC2 with uniform microporous structure and high bending strength. Porous Ti3SiC2 alloyed with 0.6Al has a slow linear increase rate of 0.0083%/μm in open porosity with increasing Ti particle size, and a strict linear relationship between the maximum aperture and Ti particle size with the increase rate of 0.0342 μm/μm. The pore structure formed by the phase transition mechanism for porous MAX phase has the smallest tortuosity factor compared with that formed by the clearance mechanism and the Kirkendall effect. |
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Keywords: | MAX phase Reactive synthesis Porous material Tortuosity factor Pore structure |
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