Sintering of superhard instrumental-purpose composites of the Bl group in the cBN-NbC-Al system under high pressure and high temperature conditions

Stratiichuk, DA
Turkevich, VZ
Slipchenko, KV
Bushlya, VM
Bilyavyna, NM
Dopov. Nac. akad. nauk Ukr. 2020, 2:37-44
Section: Materials Science
Language: Ukrainian

The processes of sintering of superhard composite materials of the BL group in the cBN—NbC—Al system under high pressure conditions (7.7 GPa) in the temperature range of 1800—2350 ºC with the selected volume ratio of the initial components cBN : NbC : Al = 60 : 35 : 5 are studied. According to the XRD analysis, it is established that, starting from 1800 ºC, a chemical interaction occurs between the components resulting in the formation of niobium diboride (NbB2) in the amount of 7 wt %, as well as an insignificant amount of aluminium oxide, AlN and AlB2 as a result of liquid-phase reactions using aluminium. All those newly formed compounds are arranged in the intergranular space and at triple grain junctions representing the binding phases of the basic ceramicmatrix composite cBN—NbC. Based on the results of ultrasound diagnostics, it is shown that Young’s modulus and the shear modulus are at a maximum for ceramics obtained at ТSINT.= 1950 ºC, and a further increase in the sintering temperature leads to reduced stress-strain properties. Superhard ceramic plates with high stressstrain properties can be used for the high-speed turning of tempered (up to 60 HRC) and high-alloyed (including Inconel) steel at high temperatures in the cutting area.

Keywords: cBN, cutting ceramics, high pressures, niobium carbide, superhard materials

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