Elastic Properties of Polycrystalline Cubic Boron Nitride and Diamond

Authors: Mark. P. D’Evelyn, Kornelija Zgonc (1997)

Abstract

The elastic properties of ceramic materials are important to their performance in severe abrasion and wear applications and also provide a useful, quantitative measure of quality. We have measured the Young’s modulus E, shear modulus G, and Poisson’s ratio n of several commercial polycrystalline cubic boron nitride and diamond products, in the form of free-standing disks, using the dynamic resonance method. The latter method is accurate and fast enough for routine quality control. Measurements on polycrystalline cBN yielded values of E, G, and n in the ranges of 630-770 GPa, 270-340 GPa, and 0.14-0.18, respectively, depending on the volume fraction of superabrasive, binder phase and microstructure. As a point of comparison, the orientation-averaged values of E, G, and n for pure, equiaxed, polycrystalline cBN are calculated as 909 GPa, 405 GPa, and 0.12, respectively. Measured values of E, G, and n for sintered diamond lay in the ranges of 915-990 GPa, 415-450 GPa, and 0.10-0.11, respectively. The modulus results are compared to selected additional material properties.

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