TiC颗粒强化钛基复合材料的界面反应

Interface Reaction of TiC Particle Reinforced Titanium Composites

研究了TiC颗粒强化钛基复合材料中的界面反应。TiC的降解反应以及C原子向基体中扩散,在TiC粒子周围形成了非化学计量的反应界面层,界面层的C浓度呈连续梯度变化。电子衍射花样证明,界面层比较干净,没有发现其他反应产物。该界面反应层具有可逆的特征,界面厚度随工艺条件而变。加热温度越高,反应速度加快,界面变厚;加热后的缓慢冷却能够使C原子重新沉淀,界面变薄。

Interface reaction of TiC particle reinforced titanium alloy is studied. The interface reaction results in a non-stoichiometric interface layer formed around each TiC particle because of TiC resolution and carbon diffusion into the matrix. The carbon concentration in the interfaces decreases continuously. The electronic diffraction pattern shows that these interfaces are clean without any other reaction products. It is also indicated that the interface reaction layer has an invertible character, the width of which varies as processing conditions. The experimental data show that both reaction speed and interface layer width increase with the increasing of heating temperature. However, the slow cooling after heating enables carbon atom precipitate again on TiC particles and the width of interfaces becomes thinner.