INTERFACIAL MICROSTRUCTURES AND IMPACT PROPERTIES FOR NB MOSI2 LAMINATE COMPOSITES/

The purpose of present work is to investigate effects of fabricating t emperature and ZrO2 SIC and NbSi2 addition on interfacial reaction lay er and impact properties fur Nb/MoSi2 laminate composites. Four types of laminate composites alternating four layers of Nb foil with each Mo Si2 mixture layer containing ZrO2, SiC and NbSi2 particles were fabric ated by hut pressing. The volume fraction of Nb foil involved in these system was nominally 10 vol%. It has been found that the impact value of Nb/MoSi2 laminate composites decreased at a fabrication temperatur e higher than 1523 K, since the thickness of reaction layer between Nb and MoSi2 increased along vr with fabricating temperature. However, t he addition of ZrO2, particles to Nb/MoSi2 laminate composites fabrica ted at 1623 K resulted in a change of the interfacial microstructure a s well as a reduction of the reaction layer. Nb/MoSi2-ZrO2 laminate co mposites maintained the same density as that of Nb/MoSi2 laminate comp osites fabricated at 1773 K and showed a higher impact value than that of Nb/MoSi2 laminate composites at 1513 K.