http://doras.dcu.ie/20548/1/_Reza_Ceramics_Int_2014_electroless_coating_of_SiC_with_NiP_Low_File_Size.pdf

Effect of electroless coating parameters and ceramic particle size on fabrication of a uniform Ni–P coating on SiC particles

Corrosion studies of Alx-Ni insitu intermetallics reinforced Al metal matrix composites

Materials science, testing and informatics iii

Silicon ingot cutting process generates slurry waste which mainly contains lubricant oil, silicon and silicon carbide particles. In this study, slurry waste was the subject of a primary decantation which served to obtain two different effluents namely dark sludge (DS) and dark liquid (DL). Deoiling treatment of DS and DL using acetone was carried out. The resulting powders were first leached by nitric acid to remove heavy metals and then washed by distilled water to separate Si and SiC. Scanning electron microscopy (SEM) coupled to energy dispersive x-ray spectrometry (EDXS) and x-ray diffraction (XRD) show a successful separation of Si and SiC particles. As reuse of SiC-rich powder, a Cu2O-SiC composite was synthesized by electroless plating process under experimental controlled parameters.

Separation of Si and SiC from Photovoltaic Industry Waste. Recycling of SiC in Production of Cu 2 O-SiC Powder

A review of the design, properties, applications, and prospects of Ni-based composite powders

Electroless nickel (EN) plating was used to coat SiC particles, using three different pre-treatment methods (acidic pre-treatment, surface oxidation, palladium chloride activation). The acidic pre-treatment is able to activate the surface of the particles hardly. Consequently, the electroless nickel deposit formation is only particular. A coherent oxide layer is developed on the surface of the substrate after the surface oxidation. This ensures the homogeneous nickel nuclei formation after using the electroless nickel plating. Finally the palladium chloride activation creates homogeneous palladium nuclei on the surface of the silicon carbide particles. A coherent and continuous nickel layer is formed on the surface containing elemental palladium nuclei. The EN plated SiC particles were added to an Al alloy powder to produce Al/SiC composite by compression and sintering. During sintering (580°C 5h), the nickel coating of the silicon carbide particles and the matrix react with the formation of different Al-Ni phases. The arrangement and chemical composition of these intermetallic phases was studied and discussed in this paper as function of the pre-treatment method of SiC particles.

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INVESTIGATION OF THE ELECTROLESS NICKEL PLATED SiC PARTICLES IN METAL MATRIX COMPOSITES

Small batches of two oxide powders falling in the particle size range of about 30-230 μm were received from industrial sources and were electroless nickel (EN) coated in order to prepare properly modified reinforcing particles for further laboratory experiments with the Laser Melt Injection (LMI) technique to produce particle reinforced steel composite surface layers The partially calcined alumina (Al2O3) as well as the hydrothermally recycled crystalline iron(III) oxide precipitate were characterized first to check their exact size ranges, specific surface areas and major chemical contaminants so that the best possible EN plating technique would be selected and applied It was revealed soon that the sensitization and activation pre-treatment steps could not be omitted and after their proper adjustment, also the composition and pH of a relatively commonly used hypophosphite reducing type bath had to be modified to the given purpose Eventually a slightly alkaline EN bath was successfully prepared with which both industrial oxide powders surface could be nickel coated soundly, which final result was demonstrated also by several metallographic testing techniques showing the microstructure of the quite evenly and fully coated oxide particles

Laboratory Preparation and Characterization of Electroless Nickel Coated Powders of Industrially Produced Aluminium and Iron(III) Oxides

In the course of the production of Al/SiC composites made by powder metallurgical method, the interfacial bond between the reinforcing phase and the matrix is not acceptable in all cases. So the ceramic particles can suffer different kinds of damage by the stress which can mean the dropping out of the particles from the matrix, or their cracking. In order to improve the interfacial bond, the surface coating of the ceramic particles is recommended. One of the surface treatment methods is the electroless nickel plating (EN plating). The successfulness of the electroless nickel plating depends on the pre–treatment methods. By using the EN plated SiC particles in the Al/SiC composites, the nickel deposit of the silicon particles and the matrix can react with the formation of the different Al–Ni phases during the sintering. These phases were examined by scanning electron microscopy (SEM) and X–ray diffraction (XRD).

Arrangement of the Al–Ni phases in Al/SiC(Ni)p composites

Al/SiC composites are used especially in automotive and aerospace industry due to the numerous advantageous mechanical properties. These end-products can be produced by casting or powder metallurgical techniques. High strength with high toughness can be reached only by perfect interfacial bonds between the matrix and reinforcing phase. To improve the interfacial bond, one of the methods is the surface coating of the SiC particles. But the metal layer of the reinforcing phase reacts with the matrix due to the high sintering temperature and long sintering time. In our research work the formation of Al-Ni intermetallic phase was investigated by Scanning electron microscopy (SEM) and X-ray diffraction measurements (XRD).

Investigation of the Microstructure of Al/SiC(Ni)p Composites

The AlMgSi1 alloy is generally used in automotive industry owing to its excellent mechanical properties, which can be further improved by applying severe plastic deformation and heat treatment. The dislocation density in the material increases significantly during severe plastic deformation due to the characteristic intensive shear strain. Therefore the motion of dislocations becomes more and more retarded, consequently the strength improves. In addition, the motion of dislocations can be prevented by aging due to formation of coherent precipitations in the metal matrix in order to realize further increasing in strength. In this paper the combined effect of severe plastic deformation and artificial aging treatment on the evolution of mechanical properties was investigated. The samples were subjected to multiple forging (MF) process at room and enhanced temperature. One part of the deformed samples were heat treated at 150°C for different times. The deformed as well as deformed and heat treated samples were investigated by micro hardness testing and X-ray profile analysis.

Judit Pázmán

Papers

INVESTIGATION OF THE ELECTROLESS NICKEL PLATED SiC PARTICLES IN METAL MATRIX COMPOSITES

Laboratory Preparation and Characterization of Electroless Nickel Coated Powders of Industrially Produced Aluminium and Iron(III) Oxides

Arrangement of the Al–Ni phases in Al/SiC(Ni)p composites

Investigation of the Microstructure of Al/SiC(Ni)p Composites

The Effect of the Severe Plastic Deformation on the Artificial Aging of the AlMgSi1 Alloy