Abstract
The paper presents the results of examinations of WC-Co coating sprayed on ductile cast iron by high velocity oxygen fuel spray process (HVOF) with powder containing Al particles in an amount of 10%. The impact of Al particles added to the tungsten carbide coating on the structure, mechanical and tribological properties in the system of (WC-C)/ductile cast iron was examined. The microstructure of the thermal sprayed WC-Co+Al coating was characterized by light, scanning electron (SEM) and transmission electron (TEM) microscopes as well as the analysis of chemical and phase composition in micro areas (EDS, XRD). It was found that by supersonic thermal spraying with WC-Co powders with the addition of Al particles, the coatings of low porosity, high hardness, a very good adhesion to the substrate, compact structure with molten Al particles and finely fragmented WC particles embedded in a cobalt matrix, reaching the nanocrystalline sizes were obtained. Moreover, the results were discussed in reference to examination of bending strength considering cracking and delamination in the system of (WC-Co+Al)/ductile cast iron as well as hardness and wear resistance of the coating. It was found that the addition of Al particles was significantly increase resistance to cracking and wear behaviour in the studied system
Highlights
The results were discussed in reference to examination of bending strength considering cracking and delamination in the system of (WC-Co+Al)/ductile cast iron as well as hardness and wear resistance of the coating
Mm 370 coating WC-Co sprayed on ductile iron using high velocity oxygen fuel spray process (HVOF) on the structure, mechanical properties, and wear properties of the system type composite coating (WC-Co+Al)/ductile cast iron in combination with analysis of cracking and delamination of the coating in the area of interface
A typical lamellar structure was obtained, characteristic of thermal spraying, i.e. flattened grains arranged in layers formed by the powder particles, which in the HVOF process are subject to severe plastic deformation and geometrical changes
Summary
The results were discussed in reference to examination of bending strength considering cracking and delamination in the system of (WC-Co+Al)/ductile cast iron as well as hardness and wear resistance of the coating. One of the promising coating materials for use on highly loaded parts of ductile cast iron in the automotive and aerospace industries is tungsten carbide due to its high resistance to wear and high temperature corrosion, hardness and thermal conductivity. 2600°C), and the short staying time of the powder particles in the spray jet has significantly reduced the detrimental effects associated with changes in the phase composition of coatings, present in the conventional plasma spraying, such as: carbide disintegration, drastic reduction of the range of the oxidation of metallic and carbide materials, The coatings produced using the high-speed HVOF technology have excellent wear resistance and reduced porosity and increased adhesion as compared to the conventional plasma spraying. The parameters measured during the test was the penetration depth of the indenter Pd, the depth remaining after scratching Rd, the force acting on the indenter FN and acoustic emission Ae
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
