The influence of free carbon on densification and mechanical properties of ZrC/C heteromodulus composites is studied. It is shown that free carbon in the amount of up to 3 vol % decreases residual porosity in the heteromodulus composites, while the content of free carbon of more than 3 vol % increases it. Furthermore, increased carbon content in ZrC/C composites improves the sintered material toughness. In particular, for pure ZrC KIc = 4.3 MPa·m1/2, and for the composite with 3 vol.% carbon KIc = 7 MPa·m1/2. The lowest fracture toughness is demonstrated by the composite with 15 vol.% carbon KIc = 5.3 MPa·m1/2.
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Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 5, pp. 38–44, May, 2020.
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Mirovoy, Y.А., Burlachenko, A.G. & Buyakova, S.P. Structure and Properties of ZrC/C Heteromodulus High-Temperature Composites. Russ Phys J 63, 752–758 (2020). https://doi.org/10.1007/s11182-020-02094-4
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DOI: https://doi.org/10.1007/s11182-020-02094-4