Dense HfB2– 30 vol.% SiC ceramics were obtained from commercially available powders by the hot-pressing method. Their basic physicomechanical properties were measured: the flexural strength at room temperature was 300 – 700 MPa, the Vickers microhardness reached 20 GPa, the critical stress intensity factor was up to 5.9 MPa·m1/2. Thermal expansion and resistance to oxidation were measured in a wide temperature range.
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Notes
This also leads to the fact that the temperature of the eutectics HfB2–MoSi2, HfB2–SiC, HfB2–B4C, HfB2–C, HfB2–HfC is strictly higher by 100 – 200°C than in the corresponding pairs with zirconium diboride.
Over the past five years, no more than 200 research papers have been published on the synthesis of initial powders, sintering, and the study of the properties of HfB2-based ceramics.
The density of HfB2 is close to the density of molybdenum (10.2 g/cm3) and high-temperature alloys based on it.
For HP it is better to use special grades of highly disperse SiC powders.
Statistics for 12 samples measuring 3.0 × 4.0 × 45.0 mm. Despite the different densities, no difference in mass gain was observed between the UHTC samples in terms of resistance to oxidation.
The calculated density of such a coating is ~ 2.0 g/cm3, as in the case of glass with a composition of 65% SiO2 – 35% B2O3. For reference: the density of amorphous SiO2 and B2O3 is 2.21 and 1.87 g/cm3, respectively.
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The authors thank N. A. Golubeva, G. M. Bagreeva, P. Yu. Yakushkia, and A. P. Metleva for their help and assistance in carrying out the research work.
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Translated from Novye Ogneupory, No. 5, pp. 48 – 55, May 2017.
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Sokolov, P.S., Arakcheev, A.V., Mikhal’chik, I.L. et al. Ultra-High-Temperature Ceramics Based on HfB2 – 30% SiC: Production and Basic Properties. Refract Ind Ceram 58, 304–311 (2017). https://doi.org/10.1007/s11148-017-0101-4
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DOI: https://doi.org/10.1007/s11148-017-0101-4