| Popis: |
Two compositions of the Y2O3-Al2O3 (YA) and Y2O3-MgO (YM) systems were chosen to investigate the ef- fect of sintering additive composition on the mechanical and tribological properties of gas pressure sintered Si3N4/SiC ceramics. The relative density, flexural strength, fracture toughness, hardness, coefficient of friction and wear rate were verified to depend substantially on the sintering additive composition. Compared with YM, the Si3N4/SiC ceramics with YA exhibit superior sinterability and show preferable mechanical and tribological properties, especially for the Si3N4/SiC ceramics with 20wt% SiC addition. These properties can be primarily attributed to the higher relative den- sity and the grain size with smaller aspect ratio. |
