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Published in Domenico Lombardo, Ke Wang, Advances in Materials Science and Engineering, 2021
Z.X. Zhang, H.F. Tian, F.L. Tantai, H. Liu, W. Wang, J.S. Sun
Boride ceramic is a kind of cermet with good wear resistance, high melting point, and high hardness and is not easily corroded. Because of its excellent performance, it is widely used in mechanical processing, ore grinding, alloy smelting, and parts manufacturing [1]. Ternary boride cermet Mo2FeB2 has attracted much attention owing to its low cost, excellent performance, and perfect metallurgical bonding with steels [2–4]. At present, sintering methods have been primarily employed to prepare Mo2FeB2. But the sintering process is not easy to master and easy to bond; the metal reacts to form a hard and brittle third phase, which affects the performance [5].
Surface Hardening
Published in P. C. Angelo, B. Ravisankar, Introduction to Steels, 2019
In the same way, if the other interstitial element boron is diffused to the surface of steel, it is called boriding or boronizing. The boron diffused surface contains metal borides, such as iron borides, nickel borides, and cobalt borides. As pure materials, these borides provide extremely high hardness and wear resistance. These favorable properties are manifested even when they are a small fraction of the bulk solid. Boronized steel parts being extremely wear resistant will often last two to five times longer than components treated with conventional heat treatments such as hardening, carburizing, nitriding, nitrocarburizing or induction hardening. Most borided steel surfaces will have an iron boride layer with hardness ranging from 1200–1600 HV.
Kinetic study of boron diffusion in a γ-TiAl intermetallic alloy using the pack-boronising method
Published in Transactions of the IMF, 2022
D. I. Zagkliveris, D. S. Foutrakis, G. K. Triantafyllidis
Thanks to their above mentioned advantages, the TiAl intermetallics are used in applications related to the automotive industry, turbines for power plants and aeronautics.3 To improve the notable properties of the TiAl intermetallics, the boronising treatment seems to be an effective method for that requirement. This could be achieved by developing a superficial titanium boride layer. During a boronising cycle, an amount of boron atoms is moving through the substrate metal lattice, following an interstitial diffusion mechanism.4 When the boron concentration exceeds the solubility limit in the substrate crystal, then it reacts with the substrate atoms and forms one or more boride phases with the metal.4 These phases are chemically and thermally stable, and extremely hard. Most metallic elements can form stable borides, including iron, titanium, niobium and chromium. Thus, the boronising process is applied on a large variety of metal alloys or intermetallics in order to enhance their wear and corrosion resistance.5–8
Determination of Vickers indentation fracture toughness of boronised alloyed ductile iron
Published in Transactions of the IMF, 2019
Surface treatments are generally employed to improve the tribological properties (friction and wear) of metals, alloys, and composites.1 In boriding, which is a thermochemical surface hardening process, boron atoms are diffused into metal surfaces in order to form boride layers on base metals at high temperatures.2 Industrial boriding is mostly applied to ferrous materials. Salt bath, paste, pack, and plasma boriding are the conventional boronising techniques. Depending on the process temperature, chemical composition of substrate materials, boron potentials of media, and boronising time, single Fe2B or a double intermetallic phase of Fe2B and FeB can be obtained after boronising. The FeB phase generally lies adjacent to upper surfaces, whereas the Fe2B phase is found below the FeB phase. The Fe2B phase is desirable for industrial applications due to its low brittleness and the significant difference between specific volume and coefficient of thermal expansion of borides and substrates.3 Borides are non-oxide ceramics and brittle;4 therefore, their combination of high surface hardness and low coefficient of friction makes significant contributions to impeding different wear mechanisms, viz., adhesion, oxidation, abrasion, and surface fatigue.5
Insights into structural, electronic, optical and thermoelectric properties of WB and WAlB: a first principle study
Published in Philosophical Magazine, 2018
Priyanka Rajpoot, Anugya Rastogi, Udai Pratap Verma
Apart from high bulk modulus, binary borides possess a unique combination of the mechanical, electronic, optical and thermal properties, suggesting that these compounds can be used for important industrial applications such as wear-resistant coating, primary battery electrodes, chemical analysis and high-temperature structure material. Moreover, these materials suffer from intrinsic brittleness, low fracture toughness, low damage tolerance and more important poor oxidation resistance. These problems were gradually improved by inserting layer of aluminium (Al) to form nano-laminated ternary transition metal borides called the ‘MAB phase’ [22]. MAB phase consists of a transition metal boride sublattice interleaved by bilayer of pure Al atom. Ade and Hillebrecht [22] have thoroughly studied the MAB phase and focused on single crystal growth and determination of the crystal structure of M2AlB2 (M = Cr, Mn, Fe) and MAlB (M = Mo, W). The incorporation of Al to other transition metal borides, such as MoAlB, has been found to be technologically important than that of MoB [23–25]. Very recently, Rastogi et al. [26] have presented a systematic investigation on the physical properties of CrAlB for the first time.