Abstract
Reactively synthesized porous Ti3SiC2 with different pore sizes was prepared using TiH2, Si and graphite powders as starting materials. The effect of pore size on the flexural stress–strain relationship, bending strength and flexural elastic modulus were investigated. The results show that the synthesized porous Ti3SiC2 intermetallic compounds have a characteristic of a high-purity MAX phase with typical laminate microstructure. When the average pore size decreases from 21.8 to 2.1 μm, the volume content of Ti3SiC2 phase ranges from 96.9% to 99.6%, and the porosity is in the range of 49.9% to 54.1%. The flexural stress–strain curves of porous Ti3SiC2 show a characteristic of two stages of elastic deformation and fracture. The flexural modulus is in the range of 13 to 70 GPa, which increases rapidly with further decrease of the pore size. A relation similar to the Hall–Petch equation between the mechanical property and the pore size was investigated for the porous material.
Highlights
Porous Ti3 SiC2 [1,2,3,4,5], as a new type of porous intermetallic compound with MAX phase, has the performance advantages of porous metals and ceramics, such as excellent environmental corrosion resistivity [1], high temperature stability [2] as well as good thermal shock resistance and machining performance [3]
Porous Ti3 SiC2 prepared by reactive synthesis of elemental powders [6,7,8]
In the case of porous MAX phases prepared with space holder with the size of several hundred microns [4,5,13], it was found that the porosity and the pore type were the main factors influencing the elastic properties [13]
Summary
Porous Ti3 SiC2 [1,2,3,4,5], as a new type of porous intermetallic compound with MAX phase, has the performance advantages of porous metals and ceramics, such as excellent environmental corrosion resistivity [1], high temperature stability [2] as well as good thermal shock resistance and machining performance [3]. The strength and stiffness of porous Ti3 SiC2 decrease with increasing the porosity [12]. In the case of porous MAX phases prepared with space holder with the size of several hundred microns [4,5,13], it was found that the porosity and the pore type were the main factors influencing the elastic properties [13]. The pore size is an important pore structure parameter determining the filtration accuracy, and its influence on mechanical properties is an important design basis for porous materials in the filtration application. To the best of our knowledge, investigations on the effect of pore size of porous Ti3 SiC2 on its strength and stiffness have not been reported so far
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