A review on the production of metal matrix composites through stir casting – Furnace design, properties, challenges, and research opportunities

Processing, microstructure and tensile properties of nano-sized Al2O3 particle reinforced aluminum matrix composites

Solid-state interfacial reaction and load transfer efficiency in carbon nanotubes (CNTs)-reinforced aluminum matrix composites

Strengthening mechanisms in carbon nanotube-reinforced aluminum composites

http://profdoc.um.ac.ir/articles/a/1023744.pdf

Fabrication of A356 composite reinforced with micro and nano Al2O3 particles by a developed compocasting method and study of its properties

http://www.ysxbcn.com/down/paperDown.aspx?id=30456

Compocasting of A356-CNT composite

The present article investigates and compares factors affecting the process of electroless deposition of Ni–P and Ni–P–B 4 C composite coatings. The process of autocatalytic–catalytic reduction of Ni in nickel sulfate and sodium hypophosphate solution with B 4 C suspended particles has been employed in the formation of the electroless Ni–P–B 4 C composite coatings. The concentrations of 1, 2, 4 and 8 g/l of B 4 C in bath were used and resulted in Ni–P–B 4 C electroless coatings with 12, 18, 25, 33 vol.% of B 4 C. Techniques such as SEM, EDAX, optical microscopy and micro-hardness testing were employed to investigate the effect of factors such as thickness, deposition rate and heat treatment cycles on coating properties. Experiments also showed that an increase in the percentage of the particles in the coating, increases hardness. Heat treatment of the electroless composite coatings with 33 vol.% of B 4 C at 400 °C for 1 h in an Argon environment, increased the hardness by 1400 HV.

Deposition and properties of electroless Ni–P–B4C composite coatings

In the present research, three groups of the low alloy steel samples include bare steel, thermochemical treated steel and electroless Ni–P coated steel followed by thermochemical treatment were prepared. Surface characterizations such as morphology, present phases, roughness and hardness were evaluated by SEM, EDS, XRD, profilometry and microhardness tests. It is found that the effect of the thermochemical treatment in H 2 /NH 3 mixture on coated samples dependent on the coatings thickness is different. In addition, it is shown that a multicomponent coating containing phosphide, nitride and intermetallic phases as well as diffusion region can be developed in the thin electroless Ni–P coated steel by thermochemical treatment.

The effect of thermochemical treatment on the structure and hardness of electroless Ni–P coated low alloy steel

In this article, it has been attempted to investigate and compare the wear behavior of 4 types of electroless nickel-phosphorous coating (with 4, 5, 9, and 12 wt % P) at 250°C. Changes of the phosphorous deposition were controlled through the manipulation of pH in plating bath. All samples were heated at 400°C for an hour under argon gas atmosphere. Later on, after the heat treatment, the coating structures were investigated via X-ray diffraction test. Moreover, the hardness and wear behavior of coatings over sliding distance of 1000 meters were measured via Vickers micro-hardness measurement and pin-on-disk test with 10 N load, respectively. Additionally, the worn surface was investigated through SEM. The results illustrated that the higher the phosphorous proportion, the longer the amount of intermetallic phases, and the lower the coating wear. It has been determined that the highest and lowest wear resistance happened in Ni-3.5% P coating and Ni-12% P coating respectively.

S.M. Monir Vaghefi

Papers

Compocasting of A356-CNT composite

Deposition and properties of electroless Ni–P–B4C composite coatings

The effect of thermochemical treatment on the structure and hardness of electroless Ni–P coated low alloy steel

Investigation of high temperature wear resistance of electroless nickel coating with different contents of phosphorous

Novel investigation on nanostructure Ni-P-Ag composite coatings