Binderless Polycrystalline Cubic Boron Nitride Sintered Compacts for Machining of Cemented Carbides

High-purity, superhard, binderless polycrystalline cubic boron nitride (BL-PCBN) was obtained by direct hBN to cBN transformation in a toroid-type high-pressure apparatus at a pressure of 8.0 GPa and temperature of 2250 °C (HPHT-DCS; high-pressure, high-temperature direct conversion sintering). X-ra...

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Bibliographic Details
Published in:Ceramics 2024-12, Vol.7 (4), p.1477-1487
Main Authors: Osipov, Alexander S., Klimczyk, Piotr, Petrusha, Igor A., Melniichuk, Yurii O., Jaworska, Lucyna, Momot, Kinga, Rumiantseva, Yuliia
Format: Article
Language:English
Subjects:
Adhesives
Analysis
Boron
Boron nitride
Carbide tools
Cemented carbides
Cobalt
Conversion
Cubic boron nitride
Cutting resistance
Cutting tools
Cutting wear
Diamond pyramid hardness tests
Diffraction
Direct conversion
direct conversion sintering
Graphite
Hardness
High pressure
High temperature
high-pressure, high-temperature (HPHT)
Industrial applications
Machining
machining of cemented carbides
Mechanical properties
Methods
polycrystalline cubic boron nitride (PcBN)
Polycrystals
Silicon nitride
Sintered compacts
Sintering
Surface layers
Temperature
Tungsten alloys
Tungsten carbide
Turning (machining)
Wear resistance
Workpieces
X-rays
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Description
Summary:High-purity, superhard, binderless polycrystalline cubic boron nitride (BL-PCBN) was obtained by direct hBN to cBN transformation in a toroid-type high-pressure apparatus at a pressure of 8.0 GPa and temperature of 2250 °C (HPHT-DCS; high-pressure, high-temperature direct conversion sintering). X-ray diffraction analysis revealed a prominent [111] axial texture in the sintered material when the axis was oriented perpendicular to the end surface of the sample. Vickers hardness tests conducted at a load of 49 N showed that BL-PCBN possessed an exceptional hardness value of 63.4 GPa. Finally, cutting tools made of BL-PCBN and SN-PCBN (Si3N4-doped cBN-based composite) reference materials were tested during the turning of a cemented tungsten carbide workpiece. The results of the cutting tests demonstrated that the wear resistance of the BL-PCBN material obtained with the HPHT-DCS process is 1.5–1.9 times higher compared to the conventional SN-PCBN material, suggesting its significant potential for industrial application.
ISSN:2571-6131
2571-6131
DOI:10.3390/ceramics7040095