Synthesis of electrical discharge metal matrix composite coating through compacted semi-sintered electrode and its tribological studies
| Autor: | P. Muruganandam, P. Selvarani, S. Thamizhmanii, J. S. Senthilkumaar, C. Yuvaraj, Ilangovan Arun |
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| Rok vydání: | 2019 |
| Předmět: |
0209 industrial biotechnology
Materials science Mechanical Engineering Applied Mathematics Metal matrix composite General Engineering Aerospace Engineering chemistry.chemical_element 02 engineering and technology Dielectric engineering.material Tribology Tungsten Industrial and Manufacturing Engineering 020901 industrial engineering & automation Coating chemistry Automotive Engineering engineering Surface modification Composite material Layer (electronics) Tribometer |
| Zdroj: | Journal of the Brazilian Society of Mechanical Sciences and Engineering. 41 |
| ISSN: | 1806-3691 1678-5878 |
| Popis: | Electric discharge coating is an alternative process for surface modification/alloying/coating requirements to improve mechanical and metallurgical properties of the materials. The high-pressure compacted electrode is made of the semi-sintered nickel and tungsten during the electric discharging process which influences the material migration towards substrate. In this proecess addtiton of pyrolysis carbon from dielectric togeather with the alloying elements and substrate material results in formation of metal matrix composite coating. It depended on the stabilization pressure of spark which increases the deposition rate of alloying materials and reduces the carbon, brittleness, cracks, voids, blowhole on the surface and made the layer to be desired metallurgical properties. Modified layer shows higher in hardness value of 1100 HV0.5 and reduction in specific wear to 0.082 × 10−5 mm3/Nm compared with uncoated substrate material. Inclusion of the alloying material and reduction of the carbon percentage consequences in self-lubricant properties which alter the wear rate and coefficient of friction. Surfaces topography obtained during alloying, material migration and the mechanism have been characterized through scanning electron microscopy and energy-dispersive X-ray spectroscopy. The wear behaviour has been analysed by using pin-on-disc tribometer. |
| Databáze: | OpenAIRE |
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