Abstract
The powder metallurgy method, including the mechanical activation of powders in a planetary mill and spark plasma sintering at 1470°C in an inert atmosphere, is used to obtain NiAl–45 vol % Al2O3 cermet samples with the addition of nanoparticles of magnesium aluminum spinel in an amount of 0.05 vol %. The features of their microstructure are investigated. Spinel nanoparticles are located at the boundaries between the grains of the composite components. The results of X-ray diffraction analysis at t = 25 and 800°C are obtained. The main components of the material at t = 20°C are α-Al2O3 and NiAl. The dependence of internal friction on the temperature in the range of 20–900°C is studied, and the influence of magnesium aluminum spinel nanoparticles on the nature of its change is established. The internal friction curve shows that vibration dam** occurs up to 600°C. Dependences of the bending strength of cermets at t = 20–750°C are determined. The positive effect of the introduction of a small amount of magnesium aluminum spinel on the elastic properties of composites is established. The best mechanical properties are demonstrated for NiAl–42 vol % Al2O3–0.05 vol % MgAl2O4 samples. On average, the ultimate bending strength of this material is 8–15% higher compared to samples without nanoparticles. The materials obtained in this research had a bending strength under normal conditions of 460–490 MPa. A summarizing analysis of NiAl–Al2O3 cermet research is carried out to determine the nature of the dependence of the bending strength on the ratio of components. It is found that it has an extreme nature: the maximum is observed when using the ratio of aluminum oxide to aluminum nickel equal to 0.5.
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ACKNOWLEDGMENTS
This research was funded by the Russian Foundation for Basic Research (project no. 19-03-00350 А, “Develo** Methods to Improve Strength and Functional Properties of Nickel-Based Cermet Materials”).
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Agureev, L.E., Kostikov, V.I., Eremeeva, Z.V. et al. Study of the Structure and Properties of Cermets Based on the NiAl–Al2O3 System. Russ. J. Non-ferrous Metals 62, 763–770 (2021). https://doi.org/10.3103/S106782122106002X
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DOI: https://doi.org/10.3103/S106782122106002X