Mechanical properties of different types of diamond |
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| Affiliation: | 1. Fraunhofer USA Inc., Center for Coatings and Diamond Technologies, East Lansing, MI 48824-1226, United States;2. Michigan State University, Department of Electrical and Computer Engineering, East Lansing, MI 48824, United States;1. State Key Laboratory of Superhard Materials, Jilin University, Changchun 130012, China;2. Center for High Pressure Science & Technology Advanced Research, Changchun 130012, China;3. College of Science, Tianjin University of Technology, China |
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| Abstract: | The mechanical properties of different types of diamond (synthetic diamonds with different nitrogen impurity concentrations 0.3 and 200 ppm) have been investigated by sclerometry hardness and wear resistance measurements. Diamond (111) and (100) faces in the 〈100〉 and 〈110〉 directions were tested. It was found the synthetic diamond with nitrogen impurity concentration of 0.3 ppm exceeds other diamond types with respect to hardness and wear resistance, and reveals anisotropy of the mechanical properties, different from other diamond types. The hardness measured on the (111) face for synthetic diamond was 175±5 GPa for 0.3 ppm of nitrogen impurities and 151±5 GPa for 200 ppm of nitrogen impurities. The hardness measurements were performed using an ultrahard fullerite indenter exceeding diamond in hardness and the diamond faces were deformed plastically under scratching conditions. |
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