Abstract
Flame-sprayed techniques is used in this paper to coat Ni-Cr-B-Si powder on low-carbon steel or bearing steel materials of the journal surface. The wear tester is used to explore material properties of the binding capability, surface hardness, wear and friction within each layer depth. The normal force is applied in addition to the cladding layer by not only using bearing ball but also oil seal pieces, to explore rubber material of oil seal contact journal. In experiments to explore the material and processing conditions affect the microstructure and hardness of the cladding layer, and at the same hardness, surface roughness to affect the performance of the mill run.The results showed that spraying Ni-Cr-B-Si alloy powder in mild steel sheet to melt and run, cladding layer and the substrate has a uniform distribution of fine abrasive particles and binding effect, causing the substrate surface hardness (HRC) about promotion 10 times. While, if sprayed Ni-Cr-B-Si alloy powder to steel panels bearing surface because the surface coated compact structure, can reduce the surface roughness and the coefficient of friction, and more improve the wear resistance of the cladding layer.
Highlights
Flame spray coating method is a powder or wire heated by oxyacetylene flame with a high velocity gas jet to blow semi-molten powder coating material onto the substrate
The method has the advantage of pile efficiency, low cost, layer integrity, and large thickness to compare with physical vapour deposition (PVD)
The normal force is applied in addition to the cladding layer by using bearing ball and oil seal pieces, to explore rubber material of oil seal contact journal, Mount Run characteristic between the two. , explores the influence of spray material and processing conditions for tribologic characteristics of cladding layer
Summary
Flame spray coating method is a powder or wire heated by oxyacetylene flame with a high velocity gas jet to blow semi-molten powder coating material onto the substrate. Surface coating with Ni-Cr alloy powder on shaft journal can promote performances of hardness, strength, durability in medium-temperature, resistance to wear and corrosion, and low friction, et cetera. Ni-Al alloy powder has strong binding, high stack of thick, base substrate for use, adding cerium oxide and chromium can help reduce the Ni-Al intermetallic in the spraying process due to too hard and brittle and cause spall. Based on the above studies, using the spray method can improve the surface hardness of the substrate, but in the process due to incomplete powder bulk produce large voids in the coating layer or sandwiched impurities, and reduce the binding strength of the coating layer. In experiments to explore the material and processing conditions affect the microstructure and hardness of the cladding layer, and at the same hardness, surface roughness to affect the performance of the mill run
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