Interfacial Enhancement Effect On Spark Plasma Sintering Process Of Fe-based Amorphous

Among the amorphous alloy systems, Fe based amorphous alloy is alloys which is one of the earliest development and highly commercial applications. Fe-based amorphous alloy(Bulk metallic glass, BMG) is so far the strongest, hardest, most soft(supercooled liquid temperature zone superplasticity), the most tough, most elastic metallic structural materials, and has outstanding soft magnetic properties, both good resistance to oxidation and corrosion due to the high magnetic permeability and low coercive force. In terms of magnetic functional materials, Fe-based amorphous alloys are replacing the traditional silicon steel, the permalloys and ferrite transformer core material of choice, transformers,sensors and other devices; in the field of structural engineering materials, it also showed a broad prospect. The bulk amorphous alloys have excellent physical properties, chemical properties and mechanical properties, but low glass-forming ability, difficult to produce large-size amorphous alloy block, which greatly limits their application prospect engineering. Therefore, to explore methods to improve the preparation BMG critical dimension is particularly urgent.Spark Plasma Sintering(SPS) is a promising technique for preparing large BMG. This paper designed the discharge plasma sintering real-time acquisition devices to monitor real-time online voltage between upper and lower end in sample and prepare for the follow-up test. This article will use spark plasma sintering technology, choice the FeCoSiBNi micron amorphous powder, and use the micro-plasma sintering discharge transient discharge characteristics, in 2:9 duty cycle、500℃ sintering temperature sintering parameters to prepar Fe based amorphous alloys which is a good chunk of iron binding interface. In the sintering process, we will aim the SPS discharge effect enhancement mechanism of small duty as the point of cut-in of the research, to analysis competition and kinetics coordination mechanism between the interface bonding and crystallization in small pulse duty ratio. By means of the in-house designed precision device for monitoring real-time online voltage between upper and lower end in sample, we will obtain the real-time voltage and interfacial bonding relationship of amorphous alloy powder under different duty cycles. The results show that: under the conditions of a small duty cycle, the sample maintains the good amorphous properties and sintered densification, and the interface of the sample is formed at the junction of the neck.Utilizing the local micro area’s instantaneous discharge feature of SPS technique,consolidating the Fe76Si9B10P5 amorphous alloy powder amorphous alloy with a assembling of Zn0.5Ni0.5Fe2O4 inorganic nanosized powders, micro-/nano- assembled bulkamorphous alloy/ inorganic metastable composites will be prepared. The results showed that: bulk amorphous composite material retains its original amorphous character, and has a good interface bonding. The amount of inorganic nano-powders play a key role in the regulation of the discharge gap, and promote the living area of heating and cooling rate,and then change the dynamic conditions of amorphous alloy sintering.This paper tests out the spark plasma sintering process in real-time voltage changes at both ends of the sample by means of in-house designed real-time acquisition spark plasma sintering apparatus, which shows small pulse duty cycle can provide a larger role instantaneous energy in the amorphous alloy powder sintering for the preparation of bulk amorphous alloy provides a feasible method. Using spark plasma sintering technology instantaneous local micro-discharge characteristics, to consolidation coated ferrite nanoscale iron-powder aerosolized metallic glass powder, the large block of micro and nano-assembled micelle structure of an iron-based metallic glass / ferrite composites was prepared. Utilizing this method, we hope to solve the small size of the amorphous alloy brings embarrassment application bottlenecks, which will have obvious practical significances in commercial applications of amorphous alloys.