Thermal Conductivity of Polymer-Based Composites: Fundamentals and Applications

Latest research advances on magnesium and magnesium alloys worldwide

The demand for light-weighting in transport and consumer electronics has seen rapid growth in the commercial usage of magnesium (Mg). The major use of Mg is now in cast Mg products, as opposed to the use of Mg as an alloying element in other alloy systems and there is an emerging market of wrought Mg products and biomedical Mg components – such that the past two decades have seen a significant number of new Mg-alloys reported. None-the-less, the corrosion of Mg alloys continues to be a challenge facing engineers seeking weight reductions by deployment of Mg. Herein, authors review the influence of alloying on the corrosion of Mg-alloys, with particular emphasis on the underlying electrochemical kinetics that dictate the ultimate corrosion rate. Such a review focusing on the chemistry–corrosion link, both in depth and in a holistic approach, is lacking. As such the authors do not describe aspects such as high-temperature oxidation or cracking, but focus on delivering the state-of-the-art with regar...

Corrosion of magnesium alloys: the role of alloying

Nanocatalysts and other nanomaterials for water remediation from organic pollutants

Recent progress on polymer materials for additive manufacturing

Discharge behaviour of Mg-Al-Pb and Mg-Al-Pb-In alloys as anodes for Mg-air battery

Effect of hot rolling and subsequent annealing on electrochemical discharge behavior of AP65 magnesium alloy as anode for seawater activated battery

Discharge and corrosion behaviour of Mg-Li-Al-Ce-Y-Zn alloy as the anode for Mg-air battery

The electrochemical discharge performance of the Mg–Al–Pb–Ce–Y alloy in 3.5 wt% NaCl solution is investigated by using electrochemical techniques and compared with that of pure magnesium, AZ31, and Mg–Al–Pb alloys. The results indicate that Mg–Al–Pb–Ce–Y shows enhanced corrosion resistance at open circuit potential, and exhibits better performance than other samples when used as the anodes for Mg–air batteries. The voltage of the battery with the Mg–Al–Pb–Ce–Y anode is higher than those using Mg–Li anodes. The anodic efficiency of Mg–Al–Pb–Ce–Y at 10 mA cm−2 reaches 60.5 ± 0.2%, which is obviously higher than those of commercial AZ and AM magnesium alloys. This enhancement in the performance of Mg–Al–Pb–Ce–Y is owing to its modified microstructure, which reduces the self-corrosion and accelerates the spalling of oxidation products during battery discharge. Furthermore, the dissolution mechanism of Mg–Al–Pb–Ce–Y is also analyzed based on the electrochemical response and microstructure characterization.

Electrochemical discharge performance of the Mg–Al–Pb–Ce–Y alloy as the anode for Mg–air batteries

Diamond/Cu composites with high density and good thermal properties are fabricated by vacuum hot pressing via designing dual layers on the diamond particles. Different types of inner tungsten layers are coated on diamond after annealing with the loose tungsten powder, and the outer copper layer is then deposited using electroless plating. The effects of dual layers on the microstructure and thermal conductivities of diamond/Cu composite are investigated. The results indicate that the tungsten coating exhibits integrated and uniform structure when the diamond is treated with tungsten powder at 900 °C for 2 h. This tungsten coating improves the interfacial bonding and minimizes the thermal boundary resistance between the diamond and the copper matrix. Moreover, the outside copper coating promotes the sintering process, and hence favors the low-temperature densification of diamond/Cu composites. The thermal conductivity of diamond/Cu composites reaches 721 W m − 1  K − 1 , which is close to the theoretical value.

Richu Wang

Papers

Discharge behaviour of Mg-Al-Pb and Mg-Al-Pb-In alloys as anodes for Mg-air battery

Effect of hot rolling and subsequent annealing on electrochemical discharge behavior of AP65 magnesium alloy as anode for seawater activated battery

Discharge and corrosion behaviour of Mg-Li-Al-Ce-Y-Zn alloy as the anode for Mg-air battery

Electrochemical discharge performance of the Mg–Al–Pb–Ce–Y alloy as the anode for Mg–air batteries

Effects of dual-layer coatings on microstructure and thermal conductivity of diamond/Cu composites prepared by vacuum hot pressing