Abstract
In this study, carbon nanotube-reinforced silver composites (CNT/Ag) were prepared by the powder metallurgy process via spark plasma sintering (SPS) and hot pressing sintering (HP) with composite powders through an improved electroless plating method assisted by ultrasonic spray atomization. The dispersion of CNTs was effectively improved by ultrasonic spray atomization, and uniform silver layers were deposited on the surface of CNTs by electroless deposition. The property testing results showed significant improvements of the electrical conductivity, hardness, and tensile strength in the samples prepared by SPS, as compared to their HP sintered counterparts. When the volume fraction of CNTs reached 2.5%, the tensile strength reached a maximum value of 221 MPa, which was more than twice that of the pure silver samples. The structural analysis indicated different degrees of CNT agglomeration and matrix mean grain sizes in the composites prepared by SPS and HP, which are responsible for the differences in properties.
Highlights
Since carbon nanotubes (CNTs) were discovered, a significant amount of research has been conducted to exploit their properties [1,2]
Flowchart chartof ofthe thesynthesis synthesisprogress progressofofCNT-Ag composites.First, First, layer of silver nanoparticles was deposited onto the pretreated surfaces by ultrasonic spray a layer of silver nanoparticles was deposited onto the pretreated CNT surfaces by ultrasonic spray atomization
To demonstrate the dispersion improvement of CNTs via ultrasonic spray or electroless plating assisted by ultrasonic spray atomization (EPUSA), CNTs were put into deionized water and ultrasonic spray was applied
Summary
Since carbon nanotubes (CNTs) were discovered, a significant amount of research has been conducted to exploit their properties [1,2]. To enhance the interfacial bonding, CNT-metal powders are usually prepared via physical evaporation, magnetron sputtering, and electroless plating. The on improved electroless plating that adopted allows layer of uniform silver nanoparticles on the surface of the CNTs. To obtain a higher uniformity of for the realization of the process on a micrometer scale. As a novel sintering technique, the SPS technique can implement lower sintering temperature, which might be appropriate the fabrication the desired composites extremely fast cooling rates, and is characterized by a shortfor holding time at aof relatively lower sintering in the present study. The composites was investigated and discussed from the aspects of both electrical mechanical effect of the distribution state of CNTs on the enhancement of carbon nanotube-silverand composites was properties. Investigated and discussed from the aspects of both electrical and mechanical properties
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