Bulk boron carbide nanostructured ceramics by reactive spark plasma sintering |
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| Affiliation: | 1. Mechanical and Aerospace Engineering, University of Florida, Gainesville, FL 32611, USA;2. Army Research Laboratories, Aberdeen Proving Grounds, Aberdeen, MD 21005, USA |
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| Abstract: | Bulk boron carbide (B4C) ceramics was fabricated from a boron and carbon mixture by use of one-step reactive spark plasma sintering (RSPS). It was also demonstrated that preliminary high-energy ball milling (HEBM) of the B+C powder mixture leads to the formation of B/C composite particles with enhanced reactivity. Using these reactive composites in RSPS permits tuning of synthesized B4C ceramic microstructure. Optimization of HEBM + RSPS conditions allows rapid (less than 30 min of SPS) fabrication of B4C ceramics with porosity less than 2%, hardness of ~35 GPa and fracture toughness of ~ 4.5 MPa m 1/2 |
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| Keywords: | Ceramics Boron carbide High-energy ball milling Mechanical activation Reactive sintering Spark plasma sintering |
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