The effect of the addition 5 mol.% LaB6 on Weibull modulus hot-pressed ceramics in ZrB2-SiC is studied this paper. samples with a relative density 91–92%, flexural strength 300–315 MPa, and Vickers hardness 14–15 GPa are obtained by hot pressing at an isothermal holding temperature 1900°C pres-sure 30 MPa within 15 minutes argon atmosphere. induces increase from 9.5 up to 15.5 when calculating ...