Abstract
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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