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High-Density Pressureless-Sintered HfC-Based Composites
Authors:Diletta Sciti  Laura Silvestroni  Alida Bellosi
Affiliation:CNR-ISTEC, Institute of Science and Technology for Ceramics, Faenza I-48018, Italy
Abstract:Hafnium carbide (HfC)-(5, 10, and 20 vol%) MoSi2 ceramics were pressureless sintered at 1950°C in an argon flux. The materials had nearly full density (96%–98%), with mean grain sizes in the range of 3–4 μm. Depending on the MoSi2 amount (5–20 vol%), the mechanical properties were in the following ranges: hardness 16–15 GPa, Young's modulus 434–385 GPa, fracture toughness 3.6–3.4 MPa·m1/2, and room-temperature 4-point flexural strength 465–383 MPa.
Keywords:
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