Abstract
The conventional procedure of microhardness testing consists in applying a fixed load on an indentor and measuring the square of the indent under the microscope. The method of kinetic microhardness (registration of the depth of penetration of an indentor as a function of load) reveals new features of mechanical characteristics of the surface of brittle materials. The investigated sialon-based ceramics demonstrate unrelaxed hardness from 5–13 GPa and elastic relaxation up to 60%–63%. Analysis of the surface layers was made in ranks of the Meyer's equation. The value of the coefficient, N (Meyer's index), of the best investigated materials was found to be 2, varying from 0.92–2.10.
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Yurkov, A.L., Jhuravleva, N.V. & Lukin, E.S. Kinetic microhardness measurements of sialon-based ceramics. JOURNAL OF MATERIALS SCIENCE 29, 6551–6560 (1994). https://doi.org/10.1007/BF00354021
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DOI: https://doi.org/10.1007/BF00354021