无压熔渗法制备Ni3Al/TiC陶瓷基复合材料工艺研究

Study on Pressureless Melt Infiltration Process for Ni3Al/TiC Ceramic Composite

研究了采用自蔓延高温反应合成的预制件TiC-Ni3Al与金属间化合物Ni3Al的浸润性、渗透性和渗透动力学。采用SEM、EDS、XRD和金相显微镜等测试分析手段,对复合材料的组织进行分析,探讨了预制型成型无压熔渗浸渗工艺参数对Ni3Al/TiC复合材料成型的影响。结果表明,金属间化合物Ni3Al与预制件TiC-Ni3Al具有很好的浸润性,在一定温度条件下可形成致密无缺陷的组织;Ni3Al与预制件TiC-Ni3Al在熔渗过程中保持各自的化学稳定性,在渗透过程中无新相产生;Ni3Al在预制件TiC-Ni3Al中的渗透深度与渗透时间呈抛物线关系,渗透速度随渗透时间延长而降低,且随预制件相对密度增大而降低。

The wetting ability, infiltration process and infiltration kinetics of the liquid Ni3Al in porous TiC-Ni3A1 preform synthesized by self-propagating high-temperature synthesis （SHS） was investigated. The microstructure was investigated through SEM, XRD, EDS and optical microscopy. The effect of pressureless melt infiltration parameters on the forming of Ni3A1 / Tic composites was studied. The results show that the wetting abilities of liquid Ni3A1 in porous TiC-Ni3A1 preform are extreme good. The liquid Ni3A1 can completely infiltrate into the TiC-Ni3A1 preform to form compact composites without defects. Both NizA1 and TiC-NirA1 preform have high thermal and chemical stability during the infiltration without new phases. The infiltration distance （depth） of Ni3A1 melting in porous TiC-Ni3A1 preform follows a parabolic law with infiltration time changing. Infiltration velocity decreases with infiltration time and preform dense increasing.