WEAR RESISTANCE OF COMPOSITE MATERIALS BASED ON SILICON NITRIDE AND CARBIDE WITH CERAMIC MELT INFILTRATIONS

摘要

Fabrication of composite materials is considered. Porous preforms from reaction-sintered silicon nitride (RSSN) and RSSN with SiC particles have been infiltrated with CaF_2 and CaSiO_3 melts at a temperature of 1450 and 1600 deg C, respectively. The wear resistance of the composite (with infiltrations) materials turned out to be much higher than that of original (without infiltrations) materials of the RSSN and RSSN-50 percent SiC type. A composite material with the composition RSSN-50 percent SiC-CaSiO_3 is shown to possess the highest hardness and abrasive resistance.