Physical and mechanical properties of the hotpressed ZrB₂‒TaC‒SiC materials

Abstract

The high-density (with the relative density up to 98,8 %) ultrahigh temperature ZrB2‒TaC‒SiC ceramic materials (UHTCs) were prepared by means of the hot Argon pressing 30 MPa at 2000 °C, and isothermal time 15 minutes. After this the phase composition, crystal lattice parameters, ultimate bending stress, Vickers hardness, and the cracking resistance were investigated. The maximum values of the bent stress, hardness, and cracking resistance were 440 MPa, 20 GPa and 5,3 MPa·m1/2respectively. It was shown that the ZrB2/TaC ration influenced both the crystal lattice spacing and the mechanical properties of the material.Ill. 7. Ref. 50. Tab. 4.