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Mechanical Properties of Polycrystalline Translucent Cubic Boron Nitride as Characterized by the Vickers Indentation Method
Author(s) -
Taniguchi Takashi,
Akaishi Minoru,
Yamaoka Shinobu
Publication year - 1996
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1996.tb08165.x
Subject(s) - indentation , boron nitride , materials science , crystallite , fracture toughness , vickers hardness test , composite material , modulus , indentation hardness , nitride , elastic modulus , metallurgy , microstructure , layer (electronics)
Mechanical properties of polycrystalline translucent cubic boron nitride (cBN) were characterized by Vickers indentation measurement. The calculated hardness decreased from 54 to 49 GPa as the load increased to 39 N, and then remained constant for values above this load. According to the relationship between crack length and applied indentation load, the formation of the median/radial type of cracks seems to take place at an applied load above 29 N. Assuming that the ratio of hardness and Young's modulus is constant in the polycrystalline cBN, the fracture toughness, K IC , of cBN was estimated to be 5.0 ± 0.5 MPa·m 1/2 .