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...
Gespeichert in:
| Datum: | 2025 |
|---|---|
| Hauptverfasser: | , , , , , |
| Format: | Artikel |
| Sprache: | Ukrainisch |
| Veröffentlicht: |
Институт сверхтвердых материалов им. В. Н. Бакуля Национальной академии наук Украины
2025
|
| Schlagworte: | |
| Online Zugang: | http://altis-ism.org.ua/index.php/ALTIS/article/view/442 |
| Tags: |
Tag hinzufügen
Keine Tags, Fügen Sie den ersten Tag hinzu!
|
| Назва журналу: | Tooling materials science |
Institution
Tooling materials science| Zusammenfassung: | 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. |
|---|