铝熔体在Ti-C-TiC粉末混合的孔隙预制体上的润湿及浸渗行为研究

Study on Wetting and Infiltration Behavior of Aluminum Melt on Pore Preforms Mixed with Ti-C-TiC Powders

为了探究铝熔体在Ti-C-TiC粉末混合的孔隙预制体上的润湿和浸渗过程诱导自蔓延高温合成的可行性,研究了TiC粉末含量的变化对润湿和浸渗行为的影响,并结合微观结构讨论了润湿和浸渗行为的机理。结果表明,加入TiC粉末含量在0~10wt%之间的孔隙预制体能被铝熔体快速润湿和浸渗,并触发粉末预制体的自蔓延高温合成反应。铝熔体在预制体表面的润湿和浸渗行为有明显的阶段性,其润湿铺展行为符合异质表面的润湿特性,试验的产物中除了TiC以外还出现Al3Ti相和Al相。TiC粉末会降低自蔓延反应的温度,使得反应的剧烈程度得以控制,但是会延长铝熔体润湿和浸渗孔隙预制体的时间。

In order to investigate the feasibility of self-propagation high-temperature synthesis induced by the wetting and infiltration process of aluminum melt on the pore preform mixed with Ti-C-TiC powder,the effect of the variation of TiC powder content on the wetting and infiltration behavior was investigated,and the mechanism of the wetting and infiltration behavior was discussed from the microstructure.The results show that the pore preforms with the addition of TiC powder content of 0-10wt%can be rapidly wetted and infiltrated by the aluminum melt and it triggers the self-propagating high-temperature synthesis reaction of the powders preforms.The wetting and infiltration behavior of aluminum melt on the surface of the preform has obvious phases,and its wetting and spreading behavior is consistent with the wetting characteristics of heterogeneous surfaces,and Al,Ti phase and Al phase appear in the experimental products besides TiC.The TiC powders reduce the temperature of the self-propagation reaction,which makes the intensity of the reaction be controlled,but it prolongs the time of aluminum melt wetting and infiltration on the pore preform.