TiB2/FeMo陶瓷的显微结构与力学性能

以Fe-Mo为助烧剂，通过热压制备了TiB2陶瓷．研究了烧结温度、烧结时间对材料显微结构和力学性能的影响，分析了烧结致密化过程．实验结果表明，随着热压烧结温度升高，材料抗弯强度、洛氏硬度出现峰值，热压烧结时间延长，抗弯强度有所下降．液相烧结的重排阶段致密化速率最快．     

燃烧反应超快升温热压制备碳纳米管/氧化铝复合材料

报道一种制备碳纳米管增强氧化铝基复合材料的新方法,用燃烧反应所产生的热量为热源代替传统烧结炉,在燃烧反应完成的同时施加机械压力来实现快速烧结,当碳纳米管掺量为1%(质量分数)时复合材料的断裂韧性同比提高了50%,该方法有利于避免碳纳米管的高温破坏,复合材料的增韧作用主要来自于碳纳米管的拔出效应和桥联机制.     

Residual Stress Distribution of Si3N4/SiC Gradient Material and the Effect of Residual Stress on Material Properties

The Si₃N₄/SiC gradient material with a gradient composition structure was prepared by a hot pressing sintering. The sinterability, distribution of residual stress and the effect of residual stress on mechanical properties of Si₃N₄/SiC gradient materials were studied. The research results show that, at 1 750 ℃, Si₃N₄/SiC gradient materials with different ratios can achieve co-sintering, and the overall relative density of the sampl...