Analysis of the Electroconsolidation Process of Fine-Dispersed Structures Out of Hot Pressed Al2O3–WC Nanopowders

Gevorkyan, Edwin; Rucki, Mirosław; Krzysiak, Zbigniew; Chishkala, V. A.; Żurowski, W.; Kucharczyk, Wojciech; Barsamyan, Voskan; Nerubatskyi, Volodymyr; Mazur, Tomasz; Morozow, Dmitrij; Siemiątkowski, Zbigniew; Caban, Jacek

doi:10.3390/ma14216503

Cited by 16 publications

(2 citation statements)

References 41 publications

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“…Designing new materials with predefined properties is perhaps the most important issue and the task of modern materials science [36]. The cutting Al 2 O 3 -based ceramics, strengthened with 10...20 wt % of silicon carbide fibers, ensure high purity of the machined surface [37,38]. Silicon carbide strengthening makes it possible to apply this material when machining heat-resistant nickel alloys with cutting speeds exceeding 200 m/min and a feed rate of 0.16 mm/rev.…”

Section: The Study Materials and Methodsmentioning

confidence: 99%

Determining the influence of ultra-dispersed aluminum nitride impurities on the structure and physical-mechanical properties of tool ceramics

Gevorkyan

Nerubatskyi

Chyshkala

et al. 2021

EEJET

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This paper considers features related to manufacturing the chromium oxide-based tool material. The process involved ultra-dispersed powders made of aluminum nitride. It has been established that the destruction of chromium oxide at high sintering temperatures is prevented through the reaction sintering of chromium oxide (Cr2O3) and aluminum nitride (AlN). It was established that the structure of the composite depends both on the temperature and the duration of hot pressing. Thermodynamic calculations of the interaction between Cr2O3 and AlN showed that this interaction begins at a temperature of 1,300 °C. In contrast to hot pressing in the air, no СrN and Сr2N compounds were formed in a vacuum. With increasing temperature, the content of Al2O3 in solid solution becomes maximum at a temperature of 1,700 °C in the case of hot pressing in the air while in vacuum the content of Al2O3 remains unchanged within the entire temperature range of 1,300–1,700 °C. When increasing the time of hot pressing to 30 minutes, the size of individual grains reaches 10 μm. It has been shown that in the sintering process involving Cr2O3 and AlN, the plasma-chemical synthesis produces the solid solution (Cr, Al)2O3 at the interphase boundary, which improves the mechanical properties of the material. The influence exerted on the quality of the machined surface of tempered hard steel when machining by the devised tool material based on chromium oxide with an optimal admixture of 15 wt % of ultra-dispersed aluminum nitride powder was investigated. It was determined that the quality of the machined hard steel surface improved compared to standard imported tool plates. It was established that the resulting tool material, in addition to relatively high strength and crack resistance, also demonstrates high thermal conductivity, which favorably affects the quality of the machined steel surface, given that lubricants and coolants are not used during the cutting process.

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Section: The Study Materials and Methodsmentioning

confidence: 99%

Determining the influence of ultra-dispersed aluminum nitride impurities on the structure and physical-mechanical properties of tool ceramics

Gevorkyan

Nerubatskyi

Chyshkala

et al. 2021

EEJET

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“…Alumina-based ceramics are popular materials for cutting tools due to their good wear resistance, high hardness, heat resistance and chemical stability [ 2 ]. There are many reports on the effects of various reinforcements, such as graphene [ 3 ], SiC [ 4 , 5 ], SiC w -Si 3 N 4 [ 6 ], TiC [ 7 ], TiC-TiN [ 8 ] and WC [ 9 ], and the works on property improvement are still going on. Basically, sintering methods are used for the fabrication of ceramic matrix composites [ 10 , 11 , 12 ].…”

Section: Introductionmentioning

confidence: 99%

Activated Sintering of Cr2O3-Based Composites by Hot Pressing

et al. 2022

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The paper presents and discusses questions on structure formation during the sintering process of Cr2O3-based composites using the hot pressing method, when a chemical reaction between the components takes place. The task was difficult because Cr2O3 decomposes when sintered at temperatures above 1300 °C. The proposed novel method allowed for interaction between aluminum and chromia, thus avoiding the decomposition of the latter. Here, ultrafine aluminum powder played the role of the active agent forming a liquid phase and reacting with Cr2O3. The appearance of the solid solutions of (Cr,Al)2O3 with different stoichiometry of Cr and Al depended on the aluminum content in the initial mixture. The solid solution significantly strengthened boundaries between composite phases, resulting in the composite material of high fracture toughness between 5 and 7 MPa m½ and bending strength of ca. 500 MPa. The best mechanical properties exhibited the cermet with 22 wt.% of the restored chromium.

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Thermodynamic features of the synthesis of high-density ceramic-metal materials “chromium oxide–chromium” from mixtures “chromium oxide–carbon” in the process of hot pressing

Gevorkyan

Nerubatskyi

Вовк

et al. 2023

Low Temperature Physics

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Obtaining ceramic-metal materials Cr2O3–Cr by reduction of chromium with carbon in the process of hot pressing makes it possible to get high-density materials for various functional applications. The thermodynamical study of the interaction of chromium oxide with carbon (soot) is of particular interest, since not only reduced chromium is formed during the synthesis, but also chromium carbides with different stoichiometry, which makes it possible to increase the density and, consequently, the strength of the composite as a whole. Using the partial reduction of chromium oxide with carbon, it is possible to synthesize ceramic-metal materials “chromium oxide–chromium” with different chromium content. The degree of occurrence of this reaction depends on the content of carbon monoxide in its products by lowering the concentration of the obtained pure chromium. This method enables obtaining a ceramic-metal material Cr2O3–22 wt% Cr of eutectic composition, which is characterized by special physical and mechanical properties.

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Analysis of the Electroconsolidation Process of Fine-Dispersed Structures Out of Hot Pressed Al2O3–WC Nanopowders

Cited by 16 publications

References 41 publications

Determining the influence of ultra-dispersed aluminum nitride impurities on the structure and physical-mechanical properties of tool ceramics

Determining the influence of ultra-dispersed aluminum nitride impurities on the structure and physical-mechanical properties of tool ceramics

Activated Sintering of Cr2O3-Based Composites by Hot Pressing

Thermodynamic features of the synthesis of high-density ceramic-metal materials “chromium oxide–chromium” from mixtures “chromium oxide–carbon” in the process of hot pressing

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