Enhancement in the Tribological and Mechanical Properties of Electroless Nickel-Nanodiamond Coatings Plated on Iron
Journal Title: Tribology in Industry - Year 2017, Vol 39, Issue 4
Abstract
A technology to improve the tribological and mechanical surface properties of iron alloys is developed based on the electroless nickel plating. The technology combines sol-gel and electroless deposition technique. Novel nanocomposite coatings are obtained consisting of Nickel-phosphorus-nanodiamond (Ni-P-ND). The ND sol is added directly to the electroless Ni-P solution. A suitable surfactant is added to achieve well-dispersed ND particles in the electroless solution to facilitate their embodiment and equal distribution in the coating. Substrates of steel 17CrNiMo6 and spheroidal graphite cast irons are used for the manufacture of the iron alloys specimens. The surface morphology and microstructure observation performed by scanning electron microscopy (SEM) and optical metallography confirms the influence of ND particles on the coating structure. The structural phase investigation by X Ray analysis indicates a transformation of the amorphous phase to a crystalline one such as Ni, Ni3P after coatings' heat treatment. The microhardness investigation by Knoop Method and wear resistance measurement in accordance with the Polish Standard PN-83/H-04302 of Ni-P and Ni-P-ND composite coatings are evaluated and compared with each other. The increase in the value of hardness and wear resistance of Ni-P composite coatings in the presence of ND particles and after heat treatment is obtained.
Authors and Affiliations
Z . Karaguiozova, J . Kaleicheva, V . Mishev, G . Nikolcheva
Keywords
Related Articles
- EP ID EP245836
- DOI 10.24874/ti.2017.39.04.03
- Views 71
- Downloads 0
The Influence of Corrosion on the Microstructure of Thermally Treated ZA27/SiCp Composites
The influence of corrosion on the microstructure of ZA27/SiCp composites was examined. The composites were produced by compo casting technique and then subjected to the thermal treatment (T4 regime). Microstructural exam...
Diagnostics of Friction Bearings by Oil Pressure Parameters During Cycle-By-Cycle Loading
Failures of friction bearings of the crank mechanism comprise from 5 to 25 % of engine failures. The analysis of the main reasons for failures shows that the dominant reasons are the following: excess of loading conditio...
Experimental Study of Adhesive Wear of a Holding Device Using a Cross Cylinders Tester
Adhesive wear was identified in a cylinder of a rotating holding device of a forming die system, which permits to hold and align a leaf spring to carry out a punching operation at the automotive industry. To investigate...
Tribological and Thermal Investigation of Modified Hot Stamping Tools
Direct hot stamping is an established manufacturing process to produce safety-relevant car body components, while t-he hot blank is formed and quenched simultaneously in a water cooled press. In order to protect the semi...
Friction Behavior Produced in The Course of a Contact Enabled Between Composite Materials and Eco-Friendly Soles Prototypes Made of Elastomeric Material with Regard to Ice-Covered Surface
The subject matter of the present research constitutes a study of the technique of friction between samples and prototypes of soles made of composite materials comprising natural rubber characterized with ingredients ori...