Hardness and fracture toughness of moissanite |
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Affiliation: | 1. State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, 122 Luoshi Road, Wuhan, 430070, People’s Republic of China;2. R&D, IBIDEN CO. LTD., 1-1 Kitagata, Ibigawa-cho, Ibi-gun, Gifu, 501-0695, Japan;3. Institute for Materials Research, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai, 980-8577, Japan;1. School of Materials Engineering, Shanghai University of Engineering Science, Shanghai, 201620, China;2. School of Materials Science and Engineering, Harbin Institute of Technology, Harbin, 150001, China;3. School of Materials Science and Engineering, Shanghai University, Shanghai, 200444, China;4. Erich Schmid Institute of Materials Science, Austrian Academy of Sciences, Jahnstraße 12, A-8700, Leoben, Austria;5. Department Materials Physics, Montanuniversität Leoben, Jahnstraße 12, A-8700, Leoben, Austria;1. State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, 122 Luoshi Road, Wuhan 430070, People’s Republic of China;2. Hubei Key Laboratory Advanced Technology of Automobile Parts, Wuhan University of Technology, 122 Luoshi Road, Wuhan 430070, People’s Republic of China;3. RD, IBIDEN CO. LTD., 1-1 Kitagata, Ibigawa-cho, Ibi-gun, Gifu, 501-0695, Japan;4. Institute for Materials Research, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577, Japan |
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Abstract: | Disparities prevail among the reported hardness and fracture toughness values for hard and brittle materials. A better understanding of the physical nature of hardness and fracture toughness and a standardized technique for reliable measurements of these quantities is urgently needed. We strongly recommend the use of the measured hardness after the bend in the hardness versus load (H−FLoad) curve, when the hardness approaches its asymptotic value. The present work reports a systematic study of hardness and fracture toughness on moissanite (single crystal hexagonal silicon carbide, 6H-SiC) samples. The measurements were performed over a broad load range from 0.49 to 294 N with the direct indentation method. Asymptotic values of Knoop hardness of HK = 19 GPa and Vickers hardness of HV = 22 GPa were reached at a high load between 50 N and 100 N. A consistent fracture toughness of KIC = 1.8 MPa·m1/2 was obtained across the entire load range. Our study presents experimental results for the hardness and fracture toughness of moissanite in the asymptotic-hardness region, and it raises concern regarding the application of moissanite single crystals as anvil material under shear/fracture conditions. |
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