Effect of Dispersions of Al2O3 on the Physical and Mechanical Properties of Pure Copper and Copper-Nickel Alloy

This paper illustrates the mechanical and physical properties of pure Cu and Cu-Ni (50-50 wt. %) alloy mixed with Al2O3 (1-4 wt. %) as micro-particles reinforcement materials. The attained composite alloy specimens\u27 characteristics were estimated such as microstructure, relative density, electrical and thermal conductivity, hardness, and compression yield stress properties to adjust the suitable optimum percentage of reinforcing material which has the best physical and mechanical properties with different main matrix materials whether pure Cu powder or Cu-Ni mechanical alloy. The micron-sized Al2O3 was added to enhance the mechanical and physical properties of the pure Cu and Cu-Ni alloy composites. The electrical and thermal conductivity for pure Cu alloy composites were improved compared to the copper-nickel alloy matrix composites material. The hardness and compression yield stress of pure copper has enhancement values and for Cu-Ni alloy composites have enhancement values and for Cu-Ni base composites, hardness and compression yield stress have improved with the most positive enhancement values

CISAILLEMENT DYNAMIQUE MONO-AXIAL NOUVELLE MÉTHODE - PARTIE I

Une nouvelle méthode de l'étude du cisaillement mono-axial a été créée pour compléter celles déjà existantes (voir CAMPBELL, DOWLING, HARTMANN, STELLY et DORMEVAL...).A new method to study uni-axial shear has been developed in addition to the already existing ones (see CAMPBELL, DOWLING, HARTMANN, STELLY and DORMEVAL...)

Effect of carbon nano-tubes and dispersions of SiC and Al2O3 on the mechanical and physical properties of copper-nickel alloy

This paper investigates the mechanical and physical properties of Cu-Ni alloy (at 50-50 wt. %), mixed with different reinforcement materials such as carbon nanotubes CNT (0.5–2 wt. %) as nano particles, Al2O3 (1–4 wt. %) and SiC (1–4 wt. %) as microparticles. The obtained composite specimens characteristics were evaluated such as microstructure, density, electrical conductivity, thermal conductivity, hardness, and compression properties to determine the suitable reinforcement percentage that has the best physical and mechanical properties. The micron-sized Al2O3 and SiC and nano-sized CNT were added to enhance the mechanical and physical properties of the composite. The hardness and compression yield stress of Cu-Ni base composites have shown the most positive enhancement values of up to 135 % and 136 % of the matrix, respectively

Utilization of by-pass cement kiln dust and air-cooled blast-furnace steel slag in the production of some “green” cement products

By-pass cement kiln dust (CKD) is a fine-grained alkaline particulate material similar in appearance to Portland cement collected in the air-pollution control devices (such as cyclones, bag house or electrostatic precipitators) during the production of cement clinker. The generated CKD during cement production in Egypt reaches about 2.7 million tons per year (about 4% of the total cement production). In year 2015, according to the quest of the Egyptian Government, a research team has been arranged from the Housing and Building National Research Center (HBNRC) [with the share of the authors of the current work], in association with the Arab Contractors Company and some of the cement companies in Egypt. The assignment given to the team was performing: “A technical and economical feasibility study for establishing a model for a factory for cement products incorporating CKD in the vicinity of every assemblage of cement plants in Egypt”. The feasibility study concluded that: The proposed factory could produce cement bricks having a cement content of 210–250 kg/m3 and substituting 20% of the cement by CKD. The factory could, also, produce interlock paving blocks having a cement content of 450 kg/m3 or 540 kg/m3 (depending on the required strength level) and replacing 20% of the cement by CKD. The current study introduces, in addition to CKD as cement replacement, air-cooled blast-furnace steel slag (ACS) as coarse aggregate in interlock paving units substituting the conventionally used natural dolomite aggregate. The study declared the advantages of air-cooled slag that motivated such utilization. Keywords: By-Pass cement kiln dust (CKD), Air-cooled blast-furnace steel slag (ACS), Interlock paving blocks, strength, Abrasion resistanc

Effect of Carbon Nano-Tubes, Micro and Nano Dispersions of SiC and Al2O3 on the Mechanical and Physical Properties of Pure Copper

 Reviews on Advanced Materials Science 52(1):126-133 · December 2017This paper studies the physical and mechanical properties of pure copper powder with various reinforcement materials at different volume fractions. The used reinforcement materials are carbon nanotubes CNT (0.5-2 wt.%) as nano particles, Al2O3 (1-4 wt.%), and SiC (1-4 wt.%) as micro particles. Various characteristics were evaluated on the composite specimens such as microstructures, density, electrical conductivity, thermal conductivity, hardness, and compression properties to investigate the suitable reinforcement percentage that achieves the best physical and mechanical properties. The micron-sized Al2O3 and SiC and nano sized CNT has shown an enhancement on the mechanical and physical properties of the composite. The electrical and thermal conductivities were evaluated and the results have shown positive enhancements