Thermal Properties of Carbon Nanotube–Copper Composites for Thermal Management Applications

Abstract

Carbon nanotube–copper (CNT/Cu) composites have been successfully synthesized by means of a novel particles-compositing process followed by spark plasma sintering (SPS) technique. The thermal conductivity of the composites was measured by a laser flash technique and theoretical analyzed using an effective medium approach. The experimental results showed that the thermal conductivity unusually decreased after the incorporation of CNTs. Theoretical analyses revealed that the interfacial thermal resistance between the CNTs and the Cu matrix plays a crucial role in determining the thermal conductivity of bulk composites, and only small interfacial thermal resistance can induce a significant degradation in thermal conductivity for CNT/Cu composites. The influence of sintering condition on the thermal conductivity depended on the combined effects of multiple factors, i.e. porosity, CNTs distribution and CNT kinks or twists. The composites sintered at 600°C for 5 min under 50 MPa showed the maximum thermal conductivity. CNT/Cu composites are considered to be a promising material for thermal management applications.

High Temperature Oxidation Resistance of Ni22Cr11Al Bond Coat Produced by Spark Plasma Sintering as Thermal Barrier Coatings

“…EDS investigation XRD patterns through the cross section of the bond coat after oxidation at 1100°C for 100 hr, revealed the oxides phases in the bond coat are NiCr 2 O 4 , NiCrO 3, NiCrO4, and NiO [37]. The degradation of the bondcoat leading to overall TBC failure is caused by these oxides formation accompanied with rapid volume increase [38,39]. …”

The influence of carbon (fullerite, graphite) on mechanical alloying of Cu-25 at % C composites

“…In most cases, graphite can be utilized [1,[5][6][7][8]. Nanotubes [9][10][11][12][13], nanodiamonds [2,5], and fullerites [3,[14][15][16] are mentioned in the literature as possible carbon sources.…”

“…In most cases, graphite can be utilized [1,[5][6][7][8]. Nanotubes [9][10][11][12][13], nanodiamonds [2,5], and fullerites [3,[14][15][16] are mentioned in the literature as possible carbon sources. Among the methods used for modification of copper with carbon are sintering [6,13], the formation of film coatings by the joint deposition of Cu and carbon [15,16], carbon deposition from gaseous phase via the catalytic decomposition of acetylene and ethylene with subsequent compacting and sintering [12], application of ultrahigh strain [1], and shock-wave loading [14].…”

“…Among the methods used for modification of copper with carbon are sintering [6,13], the formation of film coatings by the joint deposition of Cu and carbon [15,16], carbon deposition from gaseous phase via the catalytic decomposition of acetylene and ethylene with subsequent compacting and sintering [12], application of ultrahigh strain [1], and shock-wave loading [14]. Also, a promising technique is mechanical milling in high-energy ball mills [2,[3][4][5]7]. u-C specimens have higher hardness than that of carbon-free copper [8,12], which is attributed primarily to the stabilization of copper grain boundaries [8].…”

One-Step Cutting of Multi-Walled Carbon Nanotubes Using Nanoscissors

“…Carbon nanotubes (CNTs) have attracted enormous interest in nanoscience and nanotechnology over the past decade owing to their unique chemical, mechanical, and electronic properties [1][2][3][4]. The length of CNTs is of great importance for a variety of applications.…”