Microstructural characterization of NiAl–Al2O3 composite materials obtained by in situ aluminothermic reduction of NiO for potential coating applications

Troncy, R.; Bonnet, Gilles; Pedraza, F.

doi:10.1016/j.matchemphys.2020.123124

Cited by 9 publications

(5 citation statements)

References 30 publications

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“…The results obtained in the course of this investigation into the structure of composite SHS materials are in agreement with the data provided in research works [4][5][6][7]30] in the body of literature. The authors of these research works have used self-propagating hightemperature synthesis to fabricate composites where each composite comprises a matrix with ceramic particles distributed throughout its volume.…”

Section: Discussionsupporting

confidence: 90%

High-Temperature Synthesis of Metal–Matrix Composites (Ni-Ti)-TiB2

et al. 2021

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Currently, metal–matrix composite materials are some of the most promising types of materials, and they combine the advantages of a metal matrix and reinforcing particles/fibres. Within the framework of this article, the high-temperature synthesis of metal–matrix composite materials based on the (Ni-Ti)-TiB2 system was studied. The selected approaches make it possible to obtain composite materials of various compositions without contamination and with a high degree of energy efficiency during production processes. Combustion processes in the samples of a 63.5 wt.% NiB + 36.5 wt.% Ti mixture and the phase composition and structure of the synthesis products were researched. It has been established that the synthesis process in the samples proceeds via the spin combustion mechanism. It has been shown that self-propagating high-temperature synthesis (SHS) powder particles have a composite structure and consist of a Ni-Ti matrix and TiB2 reinforcement inclusions that are uniformly distributed inside it. The inclusion size lies in the range between 0.1 and 4 µm, and the average particle size is 0.57 µm. The obtained metal-matrix composite materials can be used in additive manufacturing technologies as ligatures for heat-resistant alloys, as well as for the synthesis of composites using traditional methods of powder metallurgy.

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Section: Discussionsupporting

confidence: 90%

High-Temperature Synthesis of Metal–Matrix Composites (Ni-Ti)-TiB2

et al. 2021

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“…Another interesting system is Al 2 O 3 –NiAl [ 20 , 21 , 22 ] or NiAl/TiC–Al 2 O 3 [ 23 ]. Combining these ceramics with intermetallic phases allows producing composites for high-temperature and chemical-resistant applications.…”

Section: Introductionmentioning

confidence: 99%

“…As a result of in situ synthesis, nano-crystallites of NiAl and Al 2 O 3 were obtained. In another work [ 21 ], NiAl–Al 2 O 3 composites were sintered in-situ from Al powder and preoxidized Ni particles by aluminothermic reactions. Mechanical alloying (MA) is a popular method of synthesis materials [ 28 , 29 , 30 , 31 ].…”

Section: Introductionmentioning

confidence: 99%

Characterization of Al2O3 Samples and NiAl–Al2O3 Composite Consolidated by Pulse Plasma Sintering

et al. 2021

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The paper describes an investigation of Al2O3 samples and NiAl–Al2O3 composites consolidated by pulse plasma sintering (PPS). In the experiment, several methods were used to determine the properties and microstructure of the raw Al2O3 powder, NiAl–Al2O3 powder after mechanical alloying, and samples obtained via the PPS. The microstructural investigation of the alumina and composite properties involves scanning electron microscopy (SEM) analysis and X-ray diffraction (XRD). The relative densities were investigated with helium pycnometer and Archimedes method measurements. Microhardness analysis with fracture toughness (KIC) measures was applied to estimate the mechanical properties of the investigated materials. Using the PPS technique allows the production of bulk Al2O3 samples and intermetallic ceramic composites from the NiAl–Al2O3 system. To produce by PPS method the NiAl–Al2O3 bulk materials initially, the composite powder NiAl–Al2O3 was obtained by mechanical alloying. As initial powders, Ni, Al, and Al2O3 were used. After the PPS process, the final composite materials consist of two phases: Al2O3 located within the NiAl matrix. The intermetallic ceramic composites have relative densities: for composites with 10 wt.% Al2O3 97.9% and samples containing 20 wt.% Al2O3 close to 100%. The hardness of both composites is equal to 5.8 GPa. Moreover, after PPS consolidation, NiAl–Al2O3 composites were characterized by high plasticity. The presented results are promising for the subsequent study of consolidation composite NiAl–Al2O3 powder with various initial contributions of ceramics (Al2O3) and a mixture of intermetallic–ceramic composite powders with the addition of ceramics to fabricate composites with complex microstructures and properties. In composites with complex microstructures that belong to the new class of composites, in particular, the synergistic effect of various mechanisms of improving the fracture toughness will be operated.

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“…is may be because (1) the content of other elements in the Ni-based powder is very low, especially in the core-shell structure of the powder. As core-shell structure, Al, MoS2, and C are not firmly bonded to the Ni shell, and some of them have fallen off [17][18][19], as shown in Figure 1(b).…”

Section: Analysis Of Coating Phase Structurementioning

confidence: 99%

Preparation and Properties of Core‐Shell Structure/Ni60 Coating

Wang

Liu

Hou

et al. 2021

Shock and Vibration

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As the most important element in improving the service life of a mechanical system, surface coating materials are of key importance in the development of high-end equipment. To improve the comprehensive properties of the surface coating, the common core-shell structure/Ni60 coating was prepared on the surface of #45 steel by supersonic plasma spraying. The results show that the Ni60 has no layer structure, pores, cracks, and other defects on the surface of the coating. The nanohardness of the NNA(Ni60/Ni (Al) mixture powder), NNM(Ni60/Ni (MoS2) mixture powder), and NNC(Ni60/Ni (C) mixture powder) coatings is 6815 μN, 5750 μN, and 2000 μN. The results show that the wear resistance of the NNA coating is better. In the friction and wear test, the NNA coating mainly shows adhesive wear and abrasive wear, while the NNM and NNC coatings mainly show abrasive wear.

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Microstructural characterization of NiAl–Al2O3 composite materials obtained by in situ aluminothermic reduction of NiO for potential coating applications

Cited by 9 publications

References 30 publications

High-Temperature Synthesis of Metal–Matrix Composites (Ni-Ti)-TiB2

High-Temperature Synthesis of Metal–Matrix Composites (Ni-Ti)-TiB2

Characterization of Al2O3 Samples and NiAl–Al2O3 Composite Consolidated by Pulse Plasma Sintering

Preparation and Properties of Core‐Shell Structure/Ni60 Coating

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