SHS-加压法制备TiC/Ni梯度材料

Preparation of TiC / Ni Functionally Gradient Materials by SHS-Pressing

采用SHS-加压法制TiC/Ni梯度材料。在TiC-Ni的燃烧烧结过程中,C溶入Ti-Ni溶液中,TiC从其中析出,TiC-Ni通过在压力下的液相烧结形成TiC/Ni梯度材料。TiC晶粒尺寸随Ni量的增加而变小是由于Ni稀释剂降低了燃烧温度。TiC外形随Ni量的减少由球形变为多边形,多边形晶粒的形成是液相烧结时组织调整的结果。

A SHS-Pressing method was developed to form dense TiC / Ni functionally gradient material.The mechanisms of combustion synthesis-densification in Ti-C-Ni systems were studied.It is proposed that carbon is dissolved into Ti-Ni melt;TiC is presipitated from the melt ;The dense TiC/Ni FGM is formed by liquid phase sintering under pressure.The grain size of TiC decreases with increasing content of Ni because of reduction of combustion temperature. Grain shape of TiC varies with the content of Ni.The morphology of TiC grains changes from polyhedra to spherical shape by accommodation process when the quantity of Ni melt increases.