【摘要】 通过超重力燃烧合成技术制备出TiCxN1-x-TiB2陶瓷复合材料,研究起始配方中Ti/B4C摩尔比和超重力场对于产物相组成与显微形貌的影响。结果表明,超重力场对合成产物的宏观形貌和显微形貌都有明显影响。从宏观形貌上看,合成产物呈现出片层状结构,与常规重力场中合成产物相比,超重力场中合成的产物片层厚度更大。从显微形貌上看,超重力场中合成的产物,晶粒发育更加充分,晶粒尺寸分布更窄。与形貌相比,合成产物的相组成受超重力场的影响不明显,主要取决于起始配方中Ti/B4C摩尔比。更多还原

【Abstract】 Ti-containing ceramic composites were prepared by self-propagating high-temperature synthesis under ultra-high gravity. The effects of starting compositions and the ultra-high gravity field on the phase assemblage and microstructure of the products were discussed. The experimental results show that, the ultra-high gravity field has an evident influence on both the macro appearance and microstructure of the products. The products synthesized under ultra-high gravity have thicker layers and more homogenous microstructure with well-developed faceted grains and narrower grain size distribution. The phase assemblage of the products is mostly determined by the starting composition and little affected by the ultra-high gravity field.更多还原