Add time:08/12/2019         Source:sciencedirect.com

The paper presents a promising method of Ta–based foams preparation by the thermal dealloying method. The concept of the foams formation was to remove one of the alloying elements from the tantalum alloy under high temperature. This element was magnesium that has a relatively low boiling temperature (1090 °C). Ta-20 wt%Ti and Ta-30 wt%Ti alloys, of the melting temperatures of approx. 2400 °C and 2200 °C respectively were investigated.The first step of this study was the Ta-Ti-Mg alloys preparation using the mechanical alloying process. The next step was forming the green compacts by cold pressing and then sintering and dealloying at the same time.The influence of the sintering/dealloying parameters on the porous structure formation was investigated. The sintering stage was done in vacuum at 1500 °C. During the dealloying process, the magnesium diffuses from the middle to the surface of the sample, leaving open spaces surrounded by a metallic scaffold.The tantalum foam with high porosity and wide pore size distribution was successfully prepared. The above results clearly show a great potential of thermal dealloying in metallic foam formation.

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