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A.G. Mamalis

V.P. Nerubatskyi

E.S. Gevorkyan

M.V. Kislitsa

D.A. Hordiienko

Abstract

Cutting inserts obtained by electrosintering aluminum oxide and silicon carbide nanopowders have good mechanical properties and high thermal conductivity. Comparative tests of plates made of a composite of Al2O3 with 15 wt% SiC (As15-6) were made. The material enables finishing and semi-finishing speeds to be doubled in comparison with plates made of oxide and oxide–carbide cutting ceramics. It has been established that the formation of microcracks at grain boundaries as a result of pore formation and creep in the surface layers leads to chipping of the cutting edge. The high chipping resistance of these As15-6 ceramics is due to their high dispersion and the presence of inordinate mechanical stresses around the SiC grains.

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