Multifunctional hetero-modulus composites in the B_4C-BN-TiC-SiC-C system

摘要

Experiments have been carried out to develop multifunctional composites with improved properties and structure for use in air turbines, ballistic armor, cutting tools and atomic reactors. For optimization of the sintering process, microstructure improvement and increased plasticity we used MgO, Y_2O_3 additives. The composites contained carbon fiber (S-242 L_(av) = 370 ìm, d= 13 ìm) the carbide stoichiometric composition was maintained. Sintering was by hot pressing (25 MPa) in vacuum in the interval of 1800-1900 °C with dwell time 5-7 min. Structural analysis proved the homogeneous structure of the composite. The properties satisfy ISO standards. In summary, H_v = 24GPa, compressive strength=2300 MPa, HRA = 94, bending strength = 500-600 MPa.