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Nanoscience and Technology: An International Journal

Publicou 4 edições por ano

ISSN Imprimir: 2572-4258

ISSN On-line: 2572-4266

The Impact Factor measures the average number of citations received in a particular year by papers published in the journal during the two preceding years. 2017 Journal Citation Reports (Clarivate Analytics, 2018) IF: 1.3 To calculate the five year Impact Factor, citations are counted in 2017 to the previous five years and divided by the source items published in the previous five years. 2017 Journal Citation Reports (Clarivate Analytics, 2018) 5-Year IF: 1.7 The Immediacy Index is the average number of times an article is cited in the year it is published. The journal Immediacy Index indicates how quickly articles in a journal are cited. Immediacy Index: 0.7 The Eigenfactor score, developed by Jevin West and Carl Bergstrom at the University of Washington, is a rating of the total importance of a scientific journal. Journals are rated according to the number of incoming citations, with citations from highly ranked journals weighted to make a larger contribution to the eigenfactor than those from poorly ranked journals. Eigenfactor: 0.00023 The Journal Citation Indicator (JCI) is a single measurement of the field-normalized citation impact of journals in the Web of Science Core Collection across disciplines. The key words here are that the metric is normalized and cross-disciplinary. JCI: 0.11 SJR: 0.244 SNIP: 0.521 CiteScore™:: 3.6 H-Index: 14

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INFLUENCE OF MODIFYING ADDITIVES ON THE PHASE STABILITY AND RESISTANCE TO OXIDATION OF COATINGS BASED ON STABILIZED ZIRCONIUM DIOXIDE AND A CARBON−CARBON COMPOSITE MATERIAL

Volume 7, Edição 4, 2016, pp. 311-334
DOI: 10.1615/NanomechanicsSciTechnolIntJ.v7.i4.40
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RESUMO

Experiments on deposition of barrier and heat-resistant layers were conducted. As the barrier layer (BL) use was made of ZrN that was deposited on carbon–carbon composite material (CCCM) by the method of ion-plasma sputtering. Heat-resistant coatings were applied by the method of atmospheric plasma spraying. A series of samples with the following compositions of heat-resistant layers were obtained in the work: (1) 92 wt.% ZrO2 + 8 wt.% Y2O3; (2) (92 wt.% ZrO2 + 8 wt.% Y2O3) + 10% HfO2; (3) La2Zr2O7; (4) 20% (ZrO2 + 8% Y2O3) + 80% MoSi2, and (5) 10% (ZrO2 + 8% Y2O3) + 90% MoSi2. Also presented in the work are the results of scanning electron microscopy, as well as phase and elemental analysis of the coating obtained. It has been elucidated that the sample with coating of composition (1) has a fine-grain structure pierced by a net of cracks; the sample with coating of composition (2) has only local cracks, whereas that with coating of composition (3) has a large-grain structure with the absence of cracks. The sample with coating of composition (4) also has no cracks and the structure consists of fused particles. This is due to the presence of thermal stresses in the coating caused by the presence of various polymorphic modifications of zirconium dioxide. To stabilize one of these modifications and reduce the stresses that lead to cracking of coating, additives of titanium oxide (2) and of lanthanum oxide (3) were used. The presence of the nanomodified additive HfO2 in amounts of 10 wt.% in coating of composition (2) did not lead to a decrease in thermal stresses, which is seen on micrographs. It is shown that in the samples with coatings of compositions (2) and (3) the microstructure differs substantially, from which the conclusion was drawn that the nanomodifying additive of yttrium oxide increases the plasticity of coating and prevents the formation of cracks. The samples were subjected to testing for heat resistance in an oxygen–acetylene torch flow for 20 s at a temperature 2100°C. It has also been established that coatings of compositions (4) and (5) have excellent operating characteristics and that with increase in the concentration of MoSi2 in a coating, the porosity decreases, the structure of the coating becomes finer, with the average size of the structural component decreasing by 75 nm. Thus, it was possible to attain the self-healing effect with simultaneous stabilization of the monoclinic phase.

CITADO POR
  1. Sinitsyn D. Yu., Anikin V. N., Eremin S. A., Yudin A. G., Chuprunov K. O., Heat-resistant coatings on CCCM for aerospace applications, NOVYE OGNEUPORY (NEW REFRACTORIES), 2, 2020. Crossref

  2. Sinitsyn D. Yu., Anikin V. N., Yeremin S. A., Yudin A. G., Chuprunov K. O., Heat-Resistant CCCM Coatings for Aerospace Applications, Refractories and Industrial Ceramics, 61, 1, 2020. Crossref

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