Investigation on the Wettability between Nb-Al Alloy and Porous Al2O3 Ceramics Prepared by Freeze Casting
This paper adopted freeze casting method to prepare porous Al2O3 ceramic bodies with interconnected pore channels as a preform. The preform was pressureless infiltrated with Nb-Al binary alloy by using electromagnetic induction furnace. The results indicated that the Nb-Al melt solidified as a sphere-like body under the surface tension driving. It was difficult to obtain Nb-Al binary alloy matrix Al2O3 ceramic composites. However, the wettability between Nb-Al melt and porous Al2O3 ceramic bodies was improved obviously while the Ti and Cr alloying elements were added into Nb-Al binary alloy. Also, the resultant Nb-35Ti-20Al-10Cr melt was filled into the interconnected pore channels existed in the Al2O3 preform by pressureless infiltration.
Jianzhong Wang and Jingang Qi
H. M. Chen et al., "Investigation on the Wettability between Nb-Al Alloy and Porous Al2O3 Ceramics Prepared by Freeze Casting", Advanced Materials Research, Vols. 299-300, pp. 687-691, 2011