Effect of structural factors on the ductility and strength properties of superhard materials based on boron nitride

Bochko, A. V.; Grigor'ev, O. N.; Dzhamarov, S. S.; Karyuk, G. G.; Pilyankevich, A. N.; Trefilov, V. I.; Frantsevich, I. N.; Shatokhin, A. M.

doi:10.1007/bf00791567

Cited by 2 publications

(1 citation statement)

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“…The room temperature hardness ( Fig. 3) of cBN-based tool materials decreases significantly and in this range of cutting temperature attains values of HV ≈ 22 GPa for bcBN [22] and HV ≈ 20 GPa for wBN-cBN [23] materials. Therefore SiC particles in the MMC having slightly higher hardness (HV = 25-27 GPa) [24] can inflict mild abrasive wear to the cBN-based tooling.…”

Section: Wear Mechanismsmentioning

confidence: 94%

Performance and wear mechanisms of novel superhard diamond and boron nitride based tools in machining Al-SiCp metal matrix composite

Bushlya

Lenrick

Gutnichenko

et al. 2017

Wear

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Performance and wear mechanisms of novel superhard diamond and boron nitride based tools in machining Al-SiCp metal matrix composite . Performance and wear mechanisms of novel superhard diamond and boron nitride based tools in machining Al-SiCp metal matrix composite. Wear,[376][377][152][153][154][155][156][157][158][159][160][161][162][163][164]. https://doi. AbstractMetal matrix composites are the desired materials in aerospace and automotive industries since they possess high specific strength. However addition of reinforcement to the matrix material brings the adverse effects of high wear rate of tool materials used in their machining. The current study addresses the issues of wear and performance of superhard tools when high speed machining cast Al-Si alloy reinforced with particulate SiC (20% vol.). A wide range of developed superhard materials was compared to the commercial PCD tools. Nano grain sized wBN-cBN, binderless cBN; B6O-cBN, nano-diamond with WC binder; diamond/MAX-phase; and diamond/SiC tool materials were employed. Tool wear tests involved dry machining at cutting speeds 200 and 400 m/min at fixed cutting length of 14 000 meters. Use of nano-diamond/WC and diamond/MAXphase composites resulted in their rapid deterioration due to primarily adhesive pluck-out of diamond and binder phase. Diamond/SiC material exhibited slightly lower performance than the PCD, with the primary wear being the abrasive on the SiC binder phase. Machining with cBN-based tooling at lower speed lead to formation of stable build-up layer, frequently accompanied by severe seizure of tool and workpiece material. However at speed of 400 m/min the absence of such build-up layer caused rapid tool wear. In case of PCD and diamond-SiC tooling build-up layer remained stable in the whole cutting speed range. Presence of chemical and diffusional wear mechanisms for this tooling has been confirmed through scanning and transmission electron microscopy. Archard-type model of abrasive tool wear was developed for modelling of tool deterioration for all studied tool materials.

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Section: Wear Mechanismsmentioning

confidence: 94%