关键词：高重力场;液 - 液分离;组织改造;组织均匀性
摘 要：Based on increasing the acceleration of high-gravity field from 500 g to 2500 g,a series of TiC-TiB2 composites are prepared by combustion synthesis in high-gravity field,and microstructure modification,microstructure homogeneity and mechanical properties of TiC-TiB2 composites are discussed in terms of liquid-liquid separation of TiC-TiB2 and Al2O3 in high gravity field.XRD,FESEM and EDS results showed that by increasing the acceleration of high gravity field,Al2O3 inclusions in the ceramic decreased both in volume fraction and size due to the enhanced separation of TiC-TiB2 liquid and Al2O3 liquid,while the enhanced Stokes flow induced by the enhanced liquid-liquid separation also promoted the constitutional homogeneity of TiC-TiB2melt,thereby bringing about the refinement of the solidified microstructures,finally,making Vickers hardness and fracture toughness of the composites increase with the acceleration of high gravity field.