Al2O3/GdAlO3 Composite of Eutectic Composition by Highly Energized Spark Plasma Technique

作者：Sun Shuai; Xu Qiang; Zhu Shizhen; Liu Ling^*; Liu Ying

来源：Rare Metal Materials and Engineering, 2013, 42: 594-597.

• composite ceramic
• spark plasma sintering
• Al2O3
• GdAlO3
• microstructure

Gd2O3 and Al(NO3)(3)center dot 9H(2)O were used as the starting materials. A co-precipitation method was applied to synthesize Al2O3/GdAlO3 composite powder. In order to generate highly energized spark plasma, the special die was used. Due to the gap discharge, highly energized spark plasma was generated. At that time, the interaction between the highly energized spark plasma and the eutectic composition powder occurred. Without soaking time, the sparked sample was cooled down by the SPS equipment cooling. Another route was a conventional SPS technique that was a contrast experiment. The phases and microstructure of different technique samples were examined by X-ray diffraction and field-emission scanning electrical microscopy. A Vickers hardness tester was used for hardness of the samples. The results show that the sparked sample is Al2O3/GdAlO3 composite, while the conventional sample contains impurity. The sparked sample has three layers: the eutectic layer, the gradual layer and the sintered layer. The Vickers hardness are 20.41 GPa and 20.15 GPa for the eutectic and the sinter respectively. The eutectic has not been found in the conventional sample and the relative density of the conventional sample is low.

• 出版日期2013-6
• 单位北京理工大学