Large bulk solidified TiC-TiB2 eutectic composite ceramics were prepared by combustion synthesis under high gravity

and the WO3 was introduced into the combustion synthesis as one of oxidants in the thermit to obtain liquid Ti-W-Cr-B phase

as a result

near-full-density TiB2-（Ti

W）C eutectic composite ceramic with macrocrack free were successfully prepared.XRD

FESEM and EDS results show that the ceramic matrix is mainly composed of TiB2-（Ti

W）C eutectic structure with a little of Al2O3 and Al2O3-ZrO2 eutectic structure existed at boundary.By introducing high gravity

Stocks immigration of immiscible liquid is taken place due to their density difference

resulting in float-up of oxide liquid and settle-down of Ti-W-Cr-C-B liquid

and the layered melt consisting of oxide liquid and Ti-W-Cr-C-B liquid is formed

finally

TiB2-（Ti

W）C eutectic composites grows from the melt.Due to the mutual solubility of W-Ti

the W atom can be diffused into the TiC

resulting in the formation of （Ti

W）C solid solution with the crystal lattice structure as the same as TiC.Relative density

Vickes hardness and fracture toughness of the composites reach up to 98.4%

26.4GPa and 7.6MPa·m1/2

respectively.