Abstract
In the present study, plasma spray welding was used to prepare an in-situ niobium carbide (NbC) reinforced Ni-based composite coating on the low carbon steel, and the phase composition and the microstructure of the composite coatings were studied. The wear resistance and the wear mechanism of the composite coatings were also researched by the wear tests. The results showed that the main phases of the composite coating were NbC, γ-Ni, Cr23C6, Ni3Si, CrB, Cr5B3, Cr7C3 and FeNi3. A number of fine in-situ NbC particles and numerous chromium carbide particles were distributed in the γ-Ni matrix. The increase in the mass fraction of Nb and NiCr-Cr3C2 could lead to the increase in NbC particles in the composite coatings. Due to the high hardness of NbC and chromium carbides, the micro-hardness and the wear resistance of the composite coatings were advanced. The composite coating with the powder mixtures of 20% (Nb + NiCr-Cr3C2) and 80% NiCrBSi had the highest micro-hardness and the best wear resistance in this study. The average micro-hardness reached the maximum value 1025HV0.5. The volume loss was 39.2 mm3, which was merely 37% of that of the NiCrBSi coating and 6% of that of the substrate under the identical conditions.
Highlights
With the rapid development of modern industry, machines have been charged with more and more duties
There are many kinds of wear-resistant materials, including the particle reinforced metal matrix composite coatings studied in this study whose basic structure includes a relatively soft matrix and many hard particles
In order to obtain in-situ niobium carbide (NbC) reinforced Ni-based composite coatings, plasma spray welding was put to use with the powder mixtures of NiCrBSi/Nb/NiCr-Cr3 C2
Summary
With the rapid development of modern industry, machines have been charged with more and more duties. It is worth mentioning that the interface between the reinforcements and the metal matrix is stable and defect-free resulting in strong interfacial bonding Ceramic materials such as borides, nitrides and carbides are often used as reinforcements to enhance the performance of the coatings [18,19,20,21]. Ceramic particle reinforced metal matrix composite coatings with both metal properties (good toughness and ductility) and ceramic properties (high chemical stability and strength) could help in enhancing the wear resistance of the material surface [22,23]. In order to obtain in-situ NbC reinforced Ni-based composite coatings, plasma spray welding was put to use with the powder mixtures of NiCrBSi/Nb/NiCr-Cr3 C2. The wear mechanism of the composite coatings was discussed
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