Research on preparation and characterization of Ti-Ti5Si3 gradient composite porous material via in-situ reactive process

Porous materials have been taken more and more attentions on account of a number of unique physical properties, especially true in filtration field because of their excellent penetrability and adsorbability. In the wake of discharge of waste water from industry and human daily life, it has been an ever-increasing hazard to the environment. Hence, efforts have been made to develop simple, effective and low-cost methods for waste water treatment, and filtering processing with porous materials is to be considered as an effective and eco-friendly solution.

Normally, porous materials are divided into symmetric and asymmetric porous materials, which are used for different filtering conditions due to their respective performance characteristics. The pore sizes of asymmetric porous material, also called gradient porous material, changes in the wall thickness direction. Since this kind of material can reach a high filtering accuracy with highly effective flux, the separation equipment with the filters can enhance the efficiency and reduce energy consumption. Up to now, more efforts have been made on gradient porous material via traditional coating process, including PVD, CVD, electrical chemical, dip and sol gel process, etc. And also, porous intermetallic compounds have become a new research hot-spot recently years.