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ВПЛИВ ВИСОКОЕНТРОПІЙНОГО СПЛАВУ Ni0.65Cr0.35Co0.27Fe0.33Ti0.1Al0.07 НА ПРОЦЕСИ СПІКАННЯ cBN-КОМПОЗИТІВ ІНСТРУМЕНТАЛЬНОГО ПРИЗНАЧЕННЯ

The processes of formation of superhard cBN ceramics with a high-entropy nickel alloy as a sintering activator were studied under the conditions of HPHT sintering: Ni0.65Cr0.35Co0.27Fe0.33Ti0.1Al0.07. Superhard ceramic products obtained by both impregnation and sintering of a homogeneous charge were...

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Bibliographic Details
Date:2025
Main Authors: Стратійчук, Денис, Туркевич, Володимир, Осіпов, Олександр, Старик, Сергій, Мельнійчук, Юрій, Романенко, Ярослав
Format: Article
Language:Ukrainian
Published: Институт сверхтвердых материалов им. В. Н. Бакуля Национальной академии наук Украины 2025
Subjects:
cBN
керамо-матричні композити
BL- група
високі тиски
високоентропійні сплави
твердість
модуль Юнга.
Online Access:http://altis-ism.org.ua/index.php/ALTIS/article/view/442
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Journal Title:Tooling materials science

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Tooling materials science
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Summary:The processes of formation of superhard cBN ceramics with a high-entropy nickel alloy as a sintering activator were studied under the conditions of HPHT sintering: Ni0.65Cr0.35Co0.27Fe0.33Ti0.1Al0.07. Superhard ceramic products obtained by both impregnation and sintering of a homogeneous charge were studied by XRD analysis, their hardness, crack resistance, and Young's modulus were determined. Using SEM analysis, it was found that by impregnating cBN powder with a grain size of 14-10 μm with a high-entropy alloy, a ceramic product containing ~80 % of the cBN phase by volume was formed, and the impregnation front occupies only 1/3 of the total height of the sample. At the same time, sintering at a pressure of 7.7 GPa and T - 2200 oC of a homogeneous charge of cBN-TiC/ZrN-alloy composition for a composition of 60:35:5 % by volume allows us to obtain BL-group composites with a uniform distribution of the metal phase. According to SEM analysis, it was found that the ceramic-matrix composite contains a matrix of cBN grains and a submatrix of TiC/ZrN with clear interfacial boundaries, and alloy is localized in the structure in the form of inclusions and micron-sized layers. BL-composites have high hardness (HV50-33.2 GPa) and are high-modulus ceramics (E-517.81 GPa), and the cutting inserts made of them, such as RNGN 090300T, are suitable as cutting inserts for metalworking tools.

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