Synthesis and properties of MoAlB composites reinforced with SiC particles

Abstract

Novel MoAlB composites reinforced with 5–15 vol% SiC have been firstly prepared and characterized in the present study. The SiC reinforcement is stable with MoAlB at a sintering temperature of 1200 °C in Ar. The 5 vol% SiC/MoAlB composite exhibited improved mechanical properties and enhanced oxidation resistance. A flexural strength of 380 MPa and a Vickers hardness of 12.7 GPa were achieved and increased by 24% and 51%, respectively, as compared with those for MoAlB, indicating the enhanced strengthening effect of SiC. Cyclic oxidation tests at 1200 and 1300 °C for 10 h in air showed that the 5 vol% SiC/MoAlB composite has better oxidation resistance than MoAlB due to the formation of a dense and continuous scale composed of Al2O3 and SiO2, which prevents the oxygen inward diffusion and the evaporation of oxides. We expect that the general strategy of second phase reinforcing for materials will help to widen the applications of MoAlB composites.

Large-Scale Fabrication of High-Performing Single-Crystal SiC Nanowire Sponges Using Natural Loofah

“…Silicon carbide nanowires (SiC nw ) have drawn extensive attention by virtue of their exclusive combined merits of fibers and ceramics. − As a one-dimensional material, they have unique physical–chemical properties of wide bandgap, high phonon/thermal conductivity, high dielectric loss, adjustable electrical conductivity, and photoluminescence, which endow them with great potential for state-of-the-art functional material applications in semiconductors, optoelectronics, bioimaging, wave-absorbing, electromagnetic shielding, energy storage, and catalysis. − On the other hand, as a ceramic material, they also feature excellent mechanical properties of low density, low thermal expansion, high modulus, high-temperature oxidation resistance, and hot corrosion resistance, which make them an ideal reinforcement in ceramics, metals, or polymer matrix structural materials to achieve the superior overall performance in strength, toughness, friction, creep resistance, and heat insulation under high temperature or extreme service conditions. − …”

Ultra-fast synthesis and thermodynamic analysis of MoAlB by self-propagating high-temperature combustion synthesis

“…However, their further application is hindered by some disadvantages, one of which is intrinsic brittleness, e.g., low fracture toughness and damage tolerance. In the past over 20 years, the high fracture toughness and damage tolerance of MAX phases [2][3][4] provide inspiration for this problem: inserting one or two A-group atomic layer(s) into the binary borides to form a ternary transition-metal boride named MAB phase [5] with weak bonding [6,7], where M is the transition-metal element, A is the IIIA and IVA group elements, and B is the boron element [8][9][10][11][12].…”

Helium-induced damage in MAB phase MoAlB and Fe2AlB2: first-principles simulation

“…Doping and solid-solution have been introduced to further improve the mechanical, electrical, thermal and oxidation resistant properties of these two materials [36][37][38][39][40]. MoAlB and Fe 2 AlB 2 have also served as precursors for two-dimensional MBene with excellent electrical, magnetic and electrocatalytic performance [41][42][43] and reinforcement component in composite materials to increase the wear and oxidation resistance [44][45][46][47].…”