Fabrication of dense nano-laminated tungsten carbide materials doped with Cr3C2/VC through two-step sintering |
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Authors: | Jialin Sun Jun Zhao Xiuying Ni Feng Gong Zuoli Li |
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Affiliation: | 1. Key Laboratory of High Ef?ciency and Clean Mechanical Manufacture of MOE, School of Mechanical Engineering, Shandong University, Jinan 250061, China;2. National Demonstration Center for Experimental Mechanical Engineering Education (Shandong University), Jinan 250061, China |
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Abstract: | This work investigates the critical roles of two-step sintering (TSS) and laminated structure on the sintering behavior and mechanical properties of functionally graded WC-TiC-Al2O3 nanostructured composite materials doped with Cr3C2/VC. Results show that excellent mechanical properties are achieved for tailored TSS conditions with a hardness of 27.91?±?2.3?GPa and a flexural strength of 1423.3?±?23.5?MPa. The desirable mechanical properties are attributed to the suppressed grain growth without densification deterioration. TSS is more effective in facilitating the favorable dispersion of secondary phase toughening nano-particulates in a WC matrix than conventional sintering (CS). Cr3C2/VC dopant plays an important role in maximizing and shifting the temperature range of the kinetic window for WC-Al2O3 composites. Al2O3 crack deflection, transgranular Al2O3, microcracking, WC crack bridging and plate-like WC crack deflection are the major toughening mechanisms. Residual surface compressive stress induced by the graded structure is also an appreciated contribution to the improvement of mechanical properties. |
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Keywords: | TSS FGM Mechanical properties |
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