Highly porous open cellular TiAl-based intermetallics fabricated by thermal explosion with space holder process

作者：Wang, Zhang; Jiao, Xinyang; Feng, Peizhong^*; Wang, Xiaohong; Liu, Zhangsheng; Akhtar, Farid

来源：Intermetallics, 2016, 68: 95-100.

DOI：10.1016/j.intermet.2015.09.010

• Intermetallics
• Porous materials
• Powder metallurgy
• Reaction synthesis

High porosity TIM-based intermetallics were prepared through thermal explosion (TE) from Ti-50Al at.% powders with NaCl as soluble template. The results showed that the space holder particles of NaCl were removed completely in green compacts, and porous Ti-Al materials were synthesized via a low-energy consumption method of TE at a temperature of 600 degrees C. TiAl was evolved as dominant phase in sintered materials at 1100 degrees C. With adding 80 vol.% NaCl to Ti-50Al at.% powders, the open porosity was significantly elevated up to 84%. Moreover, the porous materials exhibited a bimodal pore size distribution: large pores (200-500 mu m) replicating NaCl particles and small pores (<50 mu m) embedded in pore walls. The interconnected small and large pores make open cellular porous TiAl materials, which prescribe them promising for a wide range of applications in separation, heat insulation and catalysis.

• 出版日期2016-1
• 单位中国矿业大学（北京）