Fabrication and Characterization of NiO/YSZ Composite via Cold Press-Sintering Method

Document Type : Research Article

Authors

1 Shahid Beheshti University, A.C., Tehran, IRAN

2 Materials and Metallurgy Group, Faculty of Mechanical and Energy Engineering, Shahid Beheshti University, A.C., Tehran, Iran

3 Mining and Materials eng., Faculty member

Abstract

Among various manufacturing processes, the use of cold press-sintering has been considered with low cost, high efficiency, and the ability to produce components with the appropriate dimensional accuracy. In this method, at least two components of the alcoholic solution used in granulation and milling steps. Removing the solutions was accompanied by energy consumption, as well as, an increment in probability of crack initiation, which may limit the widespread utilization of this method. Therefore, in the present study, the soluble component in the milling step was removed. In following just using polyvinyl alcohol as a soluble component in the granulation step, the ceramic/ ceramic composite was fabricated. Doing this, samples based on NiO and YSZ were made with different weight percentages of the reinforcement component (25, 30 and 35% wt. zirconia-stabilized yttrium), and then their microstructure, density, and hardness were investigated. Microstructural studies indicate that the amount and distribution of porosity, surface quality and depth of cracks in the samples are depended on reinforcement weight. In detailed, at the surface of raw materials, no deep crack was observed. In sintered specimens, the best distribution of the gas phase was observed in NiO- 30% wt. YSZ. In addition, the radiography results provided by the above samples indicated that deep crack in the discs is not visible. Therefore, it seems that the starch as a pore former displayed the beset role via porosity distribution and lessening crack nucleation in sample having 30% reinforcement. According to microstructural and radiography results, the maximum hardness was observed in sample having the best distribution of the gas phase in matrix.

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