Porous TiC/Ni composites were prepared by combustion synthesis under high gravity. In TiC/Ni composites, hollow spheres of 50-200 mm were produced, and their walls were composed of large TiC grains and small Ni particles. A larger average size of the spheres was observed in the samples prepared under high gravity compared with those obtained under normal gravity. Phase segregation was observed under high gravity, and Ni was enriched in the lower part of the samples. It is proposed that the mobility and collision frequency of liquid droplets will increase, and thus, the agglomeration of primary droplets can be enhanced under high gravity.
High gravity combustion synthesis is a recently reported technique to prepare dense ceramics and glasses by melt casting instead of conventional powder sintering. This technique combines strong exothermic chemical reactions with a high gravity field, and offers an efficient and furnace free way for rapid production of bulk ceramic and glass materials. This article reviews major results on melt casting of dense ceramics and glasses by high gravity combustion synthesis. Several ceramic and glass materials prepared by high gravity combustion synthesis are firstly presented as examples, including single phase ceramics, multiphase eutectic or composite ceramics, glasses and glass-ceramics. Then, the reaction kinetics in high gravity combustion synthesis are discussed in detail, with an emphasis on phase separation, solidification and microstructure evolution. Finally, a conclusion is drawn with a perspective on further development and application of high gravity combustion synthesis.
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