Abstract
AbstractHighly‐dense ZrB2–SiC ceramics with excellent mechanical properties including Vickers hardness of 24.5 GPa and fracture toughness of 4.8 MPa/m1/2 were successfully prepared, by spark plasma sintering of the raw powders synthesized by a novel molten‐salt and microwave co‐assisted boro/carbothermal reduction (MSM‐BCTR) method. Compared with the processing conditions required for synthesizing ZrB2–SiC by conventional reduction method, the present MSM‐BCTR method possessed a variety of significant merits including the smaller material cost, lower processing temperature (1200°C), and remarkably higher efficiency (soaking time as short as 20 minutes). More importantly, the ZrB2–SiC powders, resultant from MSM‐BCTR treatment, were verified to have single‐crystalline nature and uniform well‐grown anisotropic morphologies (rod‐like ZrB2 and sheet‐like SiC) as well as great potential in promoting the mechanical properties of their bulk counterparts. This great achievement was mainly ascribed to the specific MSM‐BCTR conditions characterized by microwave heating and molten‐salt medium.
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