烧结压力对Micro-FAST制备多孔NiTi合金的影响
首发时间:2017-06-12
摘要:采用多物理场活化烧结微成形技术(Micro-FAST),在烧结温度850℃和升温速率50℃/s条件下快速(约5min)成功制备了Φ4mm×4mm的NiTi微型圆柱状样品,研究了烧结压力(50, 75, 100 MPa)对多孔NiTi合金致密度和微观组织的影响。结果表明,烧结压力可以通过影响原始粉末生成的孔隙、Kirkendall效应和合金化效应来影响孔隙的形成,大的烧结压力不利于原始粉末生成的孔隙,但有利于Kirkendall效应和合金化效应。考虑到试样的综合性能,从孔隙的形状、大小分布情况看,可确定采用Micro-FAST微成形技术制备NiTi合金的最佳压力为75MPa。
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Effect of sintering pressure on the fabrication of porous NiTi alloy during Micro-FAST
Abstract:With the Micro-forming Fields Activated Sintering Technology (Micro-FAST), NiTi micro-cylinder samples of Φ4mm×4mm were successfully fabricated under the sintering temperature 850℃ and heating rate50℃/s. The total sintering time was about 5 min. The influence of sintering pressure(50, 75, 100 MPa)on relative density and microstructure of NiTi alloys was investigated in present work. The results show that sintering pressure could affect the pore formation based on the coupling effects on pore formation of raw powder, Kirkendall effect and alloying effect. The bigger sintering pressure is detrimental to the pore formation between the raw powders but beneficial to Kirkendall effect and alloying effect. Considering the integrated property of NiTi samples, the optimized pressure for fabrication of NiTi alloys in Micro-FAST is 75 MPa based on the shape and distribution of pores.
Keywords: Field activated sintering technology NiTi alloy powder sintering sintering pressure
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