Abstract
This paper presents a study on the effect of the Cr3C2 carbide content on the adhesion and micro-hardness of the Cr3C2-NiCr coatings coated on 16Mn alloy steel surface by using a plasma spraying technique. The results show that when the carbide content increases from 50% up to 80% by mass, the adhesion of the coating to the steel substrate is decreased about 3 times, from 43.58 MPa to 16.32 MPa. On the contrary, the micro-hardness of the coatings is increased about 1.7 times, from 411 HV to 701 HV. The results of the study are the basis for technologists to choose the suitable proportion of Cr3C2 and NiCr of the coatings to apply in manufacturing as well as recovering mechanical parts.
Highlights
Thermal spray is often used to create a coating to protect the surface of a part or to enhance surface properties suitable for applications and working conditions
Espallargas et al investigated the corrosion resistance of the Cr3C2-25NiCr coating fabricated by using High Velocity Oxygen Fuel (HVOF) method and the hard chromium coating
In the mixture of Cr3C2-NiCr powder, the NiCr component has the role of increasing the cohesion between particles for the coating and cohesion; while the Cr3C2 component has the role of increasing the hardness and the load bearing capacity of the coating
Summary
Thermal spray is often used to create a coating to protect the surface of a part or to enhance surface properties suitable for applications and working conditions. In addition to the above features, thermal expansion coefficient of Cr3C2 component forms the basis of many high heat resistant alloys This reduces stress through thermal expansion joints in the thermal cycle, and the erosion resistance of ceramic metal coatings increases along with the increase of chromium carbide in the powder before spraying. Espallargas et al investigated the corrosion resistance of the Cr3C2-25NiCr coating fabricated by using High Velocity Oxygen Fuel (HVOF) method and the hard chromium coating. In the mixture of Cr3C2-NiCr powder, the NiCr component has the role of increasing the cohesion between particles for the coating and cohesion; while the Cr3C2 component has the role of increasing the hardness and the load bearing capacity of the coating This powder is suitable in manufacturing new parts/details or in restoring the wearand temperature-resistant parts. Adhesion (K) and micro-hardness of the coating after fabrication were studied in order to evaluate the effects of the carbide content to such the properties
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