Abstract
A new method of electro spark deposition method was put forward, which was based on the theory of electro spark deposition by changing the polarity in the liquid. Tungsten coating layers was produced on surface of Stainless Steel by electro spark deposition. The micro hardness, microstructure, chemical composition and phases of the coating layer were examined by means of hardness test, scanning electron microscopy (SEM) and energy dispersive spectrometer (EDS) analysis. The results showed that there was tungsten coating in the surface, which was discontinuous. Microhardness of the coating layer was about 3 times more than that of the substrate. The combination between coating layer and substrate was metallurgical bond.
Highlights
Electro spark deposition (ESD) has been widespread concerned for twenty years, which was used to strengthen the surface
Argon is mostly used as the protection gas, and the research tend to study the mechanism on vapor deposition
These results show that because of the present of carbon element, there is carbide in the coating which has higher hardness, which is in the state of grain
Summary
Electro spark deposition (ESD) has been widespread concerned for twenty years, which was used to strengthen the surface. The substrate material depends on the high temperature melting and infiltrating into the workpiece surface. The study for liquid phase deposition is few. Electrical discharge spark (EDM) shaping machine was used to deposit tungsten coating on the surface of stainless steel depositing, improved the hardness on the surface of the workpiece. Variety of methods was used to analyze the shape of the workpiece surface, verify the feasibility of this method, and analyze the tungsten coating and the interface of stainless steel organization. Electro spark deposition in liquid can achieve the effect of surface strengthening. The hardness elements existing in liquid can react with the substrate material.
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