Corrosion Behavior of Ti3SiC2 in Flowing Liquid Lead–Bismuth Eutectic at 500 °C

Abstract

MAX phases are promising candidate structural materials for lead-cooled fast reactors (LFRs) and accelerator-driven sub-critical systems (ADSs) due to their excellent corrosion resistance in liquid LBE. In this work, one of the typical MAX phases, Ti3SiC2, was exposed to the flowing LBE with a saturated oxygen concentration at 500 °C for up to 3000 h. The corrosion behaviors, including the evolution of the corrosion layer, mechanical properties and wettability, were evaluated via X-ray diffraction, a scanning electron microscope equipped with an energy-dispersive X-ray, a microhardness test and contact angle measurement. The results reveal that a corrosion structure with a duplex layer was formed on the sample surfaces. The outer layer was a diffusion layer, which always remained thin (<3 μm) during the whole test due to the erosion effect caused by the flowing LBE. The inner layer was the stable protective oxide layer, and its thickness increased with exposure time. The growth of the corrosion structure improved the microhardness and reduced the wettability with regard to LBE, which was beneficial to inhibiting further surface corrosion of Ti3SiC2.

Effects of TiC, Si, and Al on Combustion Synthesis of Ti3SiC2/TiC/Ti5Si3 Composites

“…As catalysts, Ti 3 SiC 2 , Ti 2 AlC, and Ti 3 AlC 2 show excellent chemoselectivity for the hydrogenation of organic compounds [15]. Ti 3 SiC 2 is one of the most studied M 3 AX 2 compounds and has been produced by many powder-sintering processes such as hot pressing (HP) [16], hot isostatic pressing (HIP) [17], mechanical alloying (MA) [18,19], spark plasma sintering (SPS) [20][21][22][23], and self-propagating high-temperature synthesis (SHS) [24][25][26][27]. A variety of powder combinations have been adopted as the initial reactants, including Ti/Si/C, Ti/SiC/C, Ti/Si/TiC, Ti/TiSi 2 /TiC, Ti/SiC/TiC, TiH 2 /SiC/C, etc.…”

“…A variety of powder combinations have been adopted as the initial reactants, including Ti/Si/C, Ti/SiC/C, Ti/Si/TiC, Ti/TiSi 2 /TiC, Ti/SiC/TiC, TiH 2 /SiC/C, etc. [ 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 , 25 , 26 , 27 ]. Sintering fabrication routes often produce secondary phases (e.g., TiC x , TiSi 2 , Ti 5 Si 3 , SiC, and Ti 5 Si 3 C x ) along with Ti 3 SiC 2 .…”

Corrosion and Mechanical Behavior of Metal Materials

“…Many high-strength metal-related materials and structures work under the coupling condition of harsh corrosion environments and complex loading [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17], and related failure cases have been reported extensively all over the world. Hence, it is absolutely essential to investigate the corrosion and mechanical behavior of metal materials, aspects which mainly include corrosion fatigue [3][4][5], stress corrosion cracking [6][7][8], erosion corrosion [9], hydrogen-induced cracking [10], wear corrosion [18], etc. From the point view of materials and structures, failure can be caused by the unique mechanical and corrosive environment during their service life.…”