Activated Sintering of Cr2O3-Based Composites by Hot Pressing

Gevorkyan, Edwin; Čepová, Lenka; Rucki, Mirosław; Nerubatskyi, Volodymyr; Morozow, Dmitrij; Żurowski, W.; Barsamyan, Voskan; Kouril, Karel

doi:10.3390/ma15175960

Cited by 5 publications

(2 citation statements)

References 38 publications

(28 reference statements)

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“…Microcracks appeared in the boundaries between grains, and creep of the material took place with subsequent tear out the parts of the material. It can be assumed that increased wear resistance may be explained by the small grain sizes and by the presence of solid solution (Cr, Al)2O3 in the interfacial areas between the phases [16].…”

Section: Resultsmentioning

confidence: 99%

Study in durability of Cr₂O₃-based ceramic cutting tools

Siemiątkowski

Morozow

Rucki

et al. 2023

22nd International Scientific Conference Engineering for Rural Development Proceedings

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The research was performed in the context of feasibility examinations of chromia application as cutting tool materials. In the paper, a study on the Cr2O3 –based ceramic cutting tools is presented from the perspective of structural features and durability under various machining parameters. Comparative analysis was performed using alumina-based ceramic cutting inserts. Microstructure was examined using scanning and transmission electron microscopy (SEM and TEM), LEO1455 VP (ZEISS) and MIRA3 TESCAN, respectively. It was found that Cr2O3 –based ceramic with AlN additions after electroconsolidation exhibited more fine structure with evenly distributed AlN inclusions and small amount of spherical pores, below 2%. The cutting durability tests were performed with both hardened NC11LV and non-hardened C45 (1.0503) steels, using multiedge cutting inserts of dimensions 14.75 mm × 14.75 mm × 4.75 mm, made of respective ceramics. The machine tool Mazak QTE was used for the tests, and the wear criterion was 0.4 mm notch wear value, assessed with Keyence microscope. It was demonstrated that a pure alumina cutting tool exhibited 3 times larger wear than Cr2O3–AlN one after 25 minutes of work. On the other hand, Cr2O3–AlN cutting edge reached the same wear rate at 175 m·min-1 as Al2O3 –based tools at just 50 m·min-1. For the same cutting speed of 150 m·min-1, the chromia-based ceramic insert worked over 30 minutes, two times longer than alumina ones. The increased wear resistance and durability can be attributed to the fine-dispersed structure obtained not only by certain proportion of components, but also by the electroconsolidation technique with specific parameters.

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Section: Resultsmentioning

confidence: 99%

Study in durability of Cr₂O₃-based ceramic cutting tools

Siemiątkowski

Morozow

Rucki

et al. 2023

22nd International Scientific Conference Engineering for Rural Development Proceedings

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“…Cr2O3 is commonly known as a catalyst, but it also exhibits high abrasive properties and is therefore widely used in the form of polishing pastes. It is an important refractory material with its high melting temperature and oxidation resistance at high temperatures [13,14].…”

Section: Introductionmentioning

confidence: 99%

Investigation of The Effect of Cr2O3 Particles on Al-Si Matrix Composites Produced by Powder Metallurgy

ÖZEL,

ASLAN

2023

Bitlis Eren Üniversitesi Fen Bilimleri Dergisi

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Metal matrix composite materials can be produced by powder metallurgy method. In this study, composite material with Al+12wt%Si matrix was produced by powder metallurgy (P/M) method. Al+12wt%Si powder was mixed by adding 5wt%, 10wt% and 15wt% Cr2O3 powder. Al+12wt%Si + Cr2O3 mixture powders were pressed unidirectional with 500MPa pressure in a cylindrical mold and sintered at 500 ºC. After sintering, optical microstructure, Scanning Electron Microscope (SEM), Energy Dispersive Spectrometer (EDS) and microhardness analyzes of the samples were made. When the results were examined, it was observed that a porous structure was formed in all of the samples. Moreover, the lowest amount of microhardness was measured in the sample added %15wt Cr2O3 powder sintered at 500 ºC.

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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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Activated Sintering of Cr2O3-Based Composites by Hot Pressing

Cited by 5 publications

References 38 publications

Study in durability of Cr₂O₃-based ceramic cutting tools

Study in durability of Cr₂O₃-based ceramic cutting tools

Investigation of The Effect of Cr2O3 Particles on Al-Si Matrix Composites Produced by Powder Metallurgy

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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Activated Sintering of Cr2O3-Based Composites by Hot Pressing

Cited by 5 publications

References 38 publications

Study in durability of Cr2O3-based ceramic cutting tools

Study in durability of Cr2O3-based ceramic cutting tools

Investigation of The Effect of Cr2O3 Particles on Al-Si Matrix Composites Produced by Powder Metallurgy

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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Study in durability of Cr₂O₃-based ceramic cutting tools

Study in durability of Cr₂O₃-based ceramic cutting tools