High-temperature oxidation and plasma torch testing of MoSi2–HfB2–MoB ceramics with single-level and two-level structure

Potanin, A. Yu.; Vorotilo, S.; Pogozhev, Yu. S.; Рупасов, С. И.; Логинов, П.А.; Швындина, Н. В.; Свиридова, Т. А.; Левашов, Е. А.

doi:10.1016/j.corsci.2019.07.001

Cited by 32 publications

(18 citation statements)

References 46 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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“…In addition to MoSi 2 , rare amounts of Mo 5 Si 3 phases, which are caused by the oxidation of MoSi 2 ‐based materials during long‐term service at elevated temperature, are detected in the spent MoSi 2 powders. [ 16–20 ] However, no obvious peak of SiO 2 , the oxidation product of MoSi 2 ‐based materials, is found in the powders due to its amorphous phase and rare amount. [ 35 ] After SPS, the composition of MS coating keeps unchanged.…”

Section: Resultsmentioning

confidence: 99%

“…Mo 5 Si 3 and bentonite are both from the spent MoSi 2 ‐based materials. [ 19,20 ] In addition to MoSi 2 and Mo 5 Si 3 phases, some black phases, which are proved to be SiO 2 by EDS, are also detected in MC coating. Although bentonite is found in MS coating after SPS, no distinct peak is detected in the XRD patterns of powders and coating.…”

Section: Resultsmentioning

confidence: 99%

“…[ 13–16 ] As one of the most popular applications of molybdenum disilicide, MoSi 2 ‐based materials can work at the temperature of 1850 °C, and it is extensively applied in hot section components of aircraft engines and industrial heating elements. [ 17–22 ] However, due to the increasing demands of MoSi 2 ‐based materials every year, large numbers of spent MoSi 2 ‐based materials are abandoned after long‐term service, causing terrible waste of resources and environmental pollution. Under this condition, spent MoSi 2 ‐based materials are expected to be used as raw materials for preparing anti‐oxidation coatings based on its excellent high‐temperature oxidation resistance, but the microstructural evolution and high‐temperature oxidation behavior of MoSi 2 coating that using spent MoSi 2 ‐based materials as raw materials on Nb are still required to be clarified.…”

Section: Introductionmentioning

confidence: 99%

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Microstructural Characterization and Anti‐Oxidation Properties of Molybdenum Disilicide Coating on Niobium by Spent MoSi₂‐Based Materials

et al. 2020

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MoSi2 coatings are prepared using spent and commercial MoSi2 powders as raw materials to protect niobium (Nb) substrate by spark plasma sintering (SPS) technique, and the microstructure and oxidation resistance of the coatings at 1500 °C are investigated. Results showed that obvious pores are found in MoSi2 coating using commercial MoSi2 (MC coating) after SPS while MoSi2 coating using spent MoSi2 (MS coating) is dense with low porosity. (Mo,Nb)5Si3 diffusion layer is generated between MS coating and the substrate with no gap or cracks, showing excellent metallurgical bonding. After long‐term oxidation at elevated temperature, pores and exposed Mo5Si3 can be observed in the oxide scale of MC coating, while dense and complete oxide scale is obtained by MS coating. Lowest mass gain (2.78 mg cm−2) is acquired by MS coating after oxidation at 1500 °C for 40 h because SiO2 oxide scale is completely formed on the dense and bentonite‐containing coating, blocking the diffusion of oxygen at high temperature. Compared with MC coating, no further oxidation occurs inside the MS coating or substrate, exhibiting better high‐temperature oxidation resistance.

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“…12 MoSi 2 -based materials are widely applied in hot section components of industrial heating elements and spacecraft engines because its working temperature can reach a high temperature (≤1850°C). [13][14][15][16] However, it is worth noting that the demands of MoSi 2based materials have been increasing steadily in recent years, and abundantly used MoSi 2 -based materials are discarded, causing the waste of resource and environmental pollution. Considering that MoSi 2 -based materials have good antioxidation properties and small amounts of bentonite, which exists as sintering additives and has relatively low melting temperature (1340-1440°C), 17 can promote the densification of powders during sintering.…”

Section: Introductionmentioning

confidence: 99%

Preparation and high‐temperature oxidation resistance of multilayer MoSi₂/MoB coating by spent MoSi₂‐based materials

et al. 2021

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Spent MoSi 2 and MoB were used as raw materials to prepare multilayer MoSi 2 / MoB coating on molybdenum by the two-step method of slurry deposition and spark plasma sintering. The results showed dense MoSi 2 /MoB coating after sintering while penetrated cracks appeared in MoSi 2 coating due to coefficient of thermal expansion mismatch between the Mo substrate and coating. After the sintering of MoSi 2 /MoB coatings, MoB and Mo 2 B diffusion layers were formed between MoB transition layer and Mo substrate without defects, exhibiting good metallurgical bonding. The hightemperature oxidation behavior of coatings (1500°C) was also explored. After oxidation of 50 h at 1500°C, lowest mass gain (0.035 mg/cm 2 ) was obtained for MoSi 2 / MoB coating, and the oxide scale was dense and complete without voids, making the oxygen diffusion at elevated temperature inhibited. Compared with MoSi 2 coating under the same oxidation conditions, relatively thinner silica oxide scale was acquired by MoSi 2 /MoB coating because of the reduction of cracks, and the multilayer coating exhibits better anti-oxidation properties at high temperature.

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High-temperature oxidation and plasma torch testing of MoSi2–HfB2–MoB ceramics with single-level and two-level structure

Cited by 32 publications

References 46 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

Microstructural Characterization and Anti‐Oxidation Properties of Molybdenum Disilicide Coating on Niobium by Spent MoSi₂‐Based Materials

Preparation and high‐temperature oxidation resistance of multilayer MoSi₂/MoB coating by spent MoSi₂‐based materials

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High-temperature oxidation and plasma torch testing of MoSi2–HfB2–MoB ceramics with single-level and two-level structure

Cited by 32 publications

References 46 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

Microstructural Characterization and Anti‐Oxidation Properties of Molybdenum Disilicide Coating on Niobium by Spent MoSi2‐Based Materials

Preparation and high‐temperature oxidation resistance of multilayer MoSi2/MoB coating by spent MoSi2‐based materials

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Product

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Microstructural Characterization and Anti‐Oxidation Properties of Molybdenum Disilicide Coating on Niobium by Spent MoSi₂‐Based Materials

Preparation and high‐temperature oxidation resistance of multilayer MoSi₂/MoB coating by spent MoSi₂‐based materials