Structure formation and densification of TiB₂-TiC-Ni composites produced by chemical reaction of Ti-B₄C system in high-gravity field

Abstract

Abstract. TiB 2 -TiC-Ni composites were achieved through direct reaction of Ti and B 4 C powder blends in a high gravity field of 1800 g with Ni binder. The microstructure of TiB 2 -TiC composites present pore-free with darker TiB 2 platelets and the brighter TiC equiaxed grains easily distinguishable. Ti-B-C-Ni full-liquid SHS intermediate products immediately were formed following the reaction of Ti and B 4 C, which was considered to yield inherently finegrained microstructures under the rapid cooling condition. The role of high gravity field was proposed as promoter of the final products densification and grain refinement of TiB 2 -TiC composites.