Influence of mechanical activation of reactive mixtures on the microstructure and properties of SHS-ceramics MoSi2–HfB2–MoB

Potanin, A. Yu.; Vorotilo, S.; Pogozhev, Yu. S.; Рупасов, С. И.; Lobova, T. A.; Левашов, Е. А.

doi:10.1016/j.ceramint.2019.07.009

Cited by 22 publications

(5 citation statements)

References 37 publications

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“…The design of hierarchically-structured structures relies heavily on the control of primary and secondary precipitation mechanisms. In particular, high energy ball milling (HEBM) treatment was instrumental in the formation of hierarchical structures in ceramics [ 20 , 21 , 22 , 23 ].…”

Section: Introductionmentioning

confidence: 99%

RETRACTED: Manufacturing of Conductive, Wear-Resistant Nanoreinforced Cu-Ti Alloys Using Partially Oxidized Electrolytic Copper Powder

et al. 2020

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Reactive powder composites Cu-(0–15%)TiH2 containing up to 5% native Cu2O were manufactured by high energy ball milling and then hot-pressed to produce bulk nanostructured copper–matrix alloys reinforced by Cu3Ti3O inclusions. Two high-energy ball-milling (HEBM) protocols were employed for the fabrication of Cu-Ti alloys: single-stage and two-stage ball milling, resulting in an order of magnitude refinement of TiH2 particles in the reactive mixtures. Single-stage HEBM processing led to the partial retention of Ti in the microstructure of hot-pressed specimens as the α-Ti phase and formation of fine-grained (100–200 nm) copper matrix interspersed with 5–20 nm Cu3Ti3O precipitates, whereas the two-stage HEBM led to the complete conversion of TiH2 into the Cu3Ti3O phase during the hot pressing but produced a coarser copper matrix (1–2 μm) with 0.1–0.2 μm wide polycrystalline Cu3Ti3O layers on the boundaries of Cu grains. The alloy produced using single-stage HEBM was characterized by the highest strength (up to 950 MPa) and electrical conductivity (2.6 × 107 Sm/m) as well as the lowest specific wear rate (1.1 × 10−5 mm3/N/m). The tribological performance of the alloy was enhanced by the formation of Cu3Ti3O microfibers in the wear debris, which reduced the friction coefficient against the Al2O3 counter-body. The potential applications of the developed alloys are briefly discussed.

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Section: Introductionmentioning

confidence: 99%

RETRACTED: Manufacturing of Conductive, Wear-Resistant Nanoreinforced Cu-Ti Alloys Using Partially Oxidized Electrolytic Copper Powder

et al. 2020

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“…Both coatings are ~23-26 µm thick and have no signs of pores or cracks. In the electrode material, MoSi2 (the dark phase) and MoB (the light phase) are accurately determined by EDS [7,9,11]. At the ESD, the short duration of the electrical pulse allows an extremely rapid solidification of the deposited electrode material and results in an exceptionally fine-grained, homogeneous coating that approaches (and with some materials, actually is) an amorphous structure [28].…”

Section: Resultsmentioning

confidence: 99%

“…A 75% MoSi 2 -5% MoB-20% HfB 2 electrode (anode) was fabricated by self-propagating high-temperature synthesis (SHS) using the technique of forced SHS pressing [9] and was shaped as a rectangular rod (40 × 4 × 4 mm).…”

Section: Methodsmentioning

confidence: 99%

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Structure Formation and Tribological Properties of Mo-Si-B-Hf Electrospark Coatings Based on Mo2Ni3Si Laves Phase

et al. 2022

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Coatings were produced on the EP741NP nickel alloy substrates by electrospark deposition (ESD) in argon using an MoSi2-MoB-HfB2 electrode. In situ high-resolution transmission electron microscopy and X-ray diffraction analysis studies have identified the temperature above which the strengthening Mo2Ni3Si Laves phase is formed in the coatings. At 25 °C, the coatings with a predominant content of the Laves phase are characterized by enhanced wear resistance, as well as a lower coefficient of friction compared to the non-annealed coatings containing binary silicides. At 700 °C, the EP741NP substrate was characterized by the lowest friction coefficient (Ktr = 0.35), and its wear was approximately at the same level as the wear of both coatings.

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“…The absence of Mo 2 B could be attributed to the fact that its decomposition temperature is lower than T ad , consistent with Refs. [50][51][52][53], where Mo 2 B has never been found in the SHS of a Mo-B system. However, changing the ratio of B did not improve the purity of the product, implying that Reaction (8) does not play a major role in the SHS process.…”

Section: Effect Of Raw Materials Particle Size On Formation Of Moalbmentioning

confidence: 99%

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

Yin¹,

He²,

Song³

et al. 2023

Journal of Advanced Ceramics

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MoAlB as a typical member of MAB phases has attracted much-growing attention due to its unique properties. However, the low production of MoAlB powders limits its further development and potential applications. In the present work, the ultra-fast preparation of high-purity MoAlB powders in a few seconds is achieved by self-propagating high-temperature synthesis (SHS) using a raw powder mixture at an atomic ratio of Mo : Al : B = 1 : 1.3 : 1. SHS reaction mechanism is obtained by analyzing the corresponding composition changes of starting materials. Furthermore, the thermodynamic prediction for the SHS reaction is consistent with the present experiments, where the preparation of MoAlB also conforms to two common self-propagating conditions of the SHS. The enthalpy vs. temperature curve shows that the adiabatic temperature of the reaction decreases with the amount of excuse Al increasing but increases when pre-heating the reactants. Also, this thermodynamic calculation provides a new idea for the preparation of other MAB phases by the SHS.

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Influence of mechanical activation of reactive mixtures on the microstructure and properties of SHS-ceramics MoSi2–HfB2–MoB

Cited by 22 publications

References 37 publications

RETRACTED: Manufacturing of Conductive, Wear-Resistant Nanoreinforced Cu-Ti Alloys Using Partially Oxidized Electrolytic Copper Powder

RETRACTED: Manufacturing of Conductive, Wear-Resistant Nanoreinforced Cu-Ti Alloys Using Partially Oxidized Electrolytic Copper Powder

Structure Formation and Tribological Properties of Mo-Si-B-Hf Electrospark Coatings Based on Mo2Ni3Si Laves Phase

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

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