Fabrication and Microstructure Evolution of Niobium-Niobium Silicide Composites by Spark Plasma Sint

• 作 者: 陈哲 严有为
• 机 构: State Key Lab of Die & Mould Technology Huazhong University of Science & Technology,State Key Lab of
• 出 处: Journal of Wuhan University of Technology(Materials Science
• 发表日期: 2007年02期
• 关键词: reactant spark Sintering depleted powders dense sintering interfacial synthesize

By using Nb and Si elemental powders as raw materials,dense Nb/Nb 5 Si 3 composites were successfully fabricated by a spark plasma sintering(SPS)technology.The microstructure of the fabricated composites was analyzed by OM,SEM,XRD and EPMA;the microstructure evolution of the composites was also investigated by a quenching test.The experimental results show that the prepared composites consist of Nb and Nb 5 Si 3 phases;Nb particle uniformly distributes in the in-situ synthesized Nb5 Si3 matrix.During the SPS process,an interfacial reaction occurs between Nb and Si particles to synthesize Nb 5 Si 3 until reactant silicon has been completely depleted.

By using Nb and Si elemental powders as raw materials, dense Nb / Nb 5 Si 3 composites were successfully fabricated by a spark plasma sintering (SPS) technology. The microstructure of the fabricated composites was analyzed by OM, SEM, XRD and EPMA; the microstructure evolution of the composites was also investigated by a quenching test. The experimental results show that the prepared composites consist of Nb and Nb 5 Si 3 phases; Nb particle-shaped disperses in the in-situ synthesized Nb 5 Si 3 matrix. In the SPS process, an interfacial reaction occurs between Nb and Si particles to synthesize Nb 5 Si 3 until reactant silicon has been completely depleted.