Spark plasma sintering process for Nb-Si ultra-high temperature materials

作者：Zhang Ai Jun; Han Jie Sheng; Ma Wen Lin; Meng Jun Hu^*

来源：Journal of Materials Engineering, 2016, 44(3): 1-8.

DOI：10.11868/j.issn.1001-4381.2016.03.001

• Heating and cooling rates
• Mechanical performance
• Process parameters
• Sintering process
• Sintering temperatures
• Slow heating rates
• Spark plasma sintering process
• Ultrahigh temperature

Nb-Si ultra-high temperature material was prepared by sparking plasma sintering (SPS) technology using the mixed powders of niobium and silicon. The effect of process parameters, such as sintering temperature, holding time, heating and cooling rates in the sintering process, on the phase composition, microstructure and room temperature mechanical properties of the material was investigated. The results show that the material mainly consists of two phases of Nbss(Nb based solid solution) and α-Nb5Si3as sintered above 1300. The relative density and mechanical properties of the material are enhanced continuously with increasing sintering temperature. The material prepared at 1600 has the optimum mechanical performance. The phase composition and the microstructure remain unchanged with increasing the holding time at 1600, while the mechanical properties of the material are improved slightly. The slow heating rate and the rapid cooling rate after sintering are favorable for improving the room temperature mechanical properties. With the application of an optimized SPS process, Nb-Si ultra-high temperature material with superior comprehensive room temperature mechanical properties can be prepared.

• 出版日期2016
• 单位中国科学院大学