Processing and Room Temperature Mechanical Properties of a Zirconium Carbide Ceramic
Zirconium carbide (ZrC) powder, batched to a ratio of 0.98 C/Zr, was prepared by carbothermal reduction of ZrO2 with carbon black. Nominally phase-pure ZrC powder had a mean particle size of 2.4 μm. The synthesized powder was hot-pressed at 2150°C to a relative density of > 95%. The mean grain size was 2.7 ± 1.4 μm with a maximum observed grain size of 17.5 μm. The final hot-pressed billets had a C/Zr ratio of 0.92, and oxygen content of 0.5 wt%, as determined by gas fusion analysis. The mechanical properties of ZrC0.92O0.03 were measured at room temperature. Vickers’ hardness decreased from 19.5 GPa at a load of 0.5 kgf to 17.0 GPa at a load of 1 kgf. Flexural strength was 362.3 ± 46 MPa, Young's modulus was 397 ± 13 MPa, and fracture toughness was 2.9 ± 0.1 MPa•m1/2. Analysis of mechanical behavior revealed that the largest ZrC grains were the strength-limiting flaw in these ceramics.
N. Korklan et al., "Processing and Room Temperature Mechanical Properties of a Zirconium Carbide Ceramic," Journal of the American Ceramic Society, vol. 104, no. 1, pp. 413 - 418, Wiley, Jan 2021.
The definitive version is available at https://doi.org/10.1111/jace.17442
Materials Science and Engineering
Keywords and Phrases
Characterization; Mechanical Properties; Processing
International Standard Serial Number (ISSN)
Article - Journal
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01 Jan 2021