Microstructures Evolution and Micromechanics Features of Ni-Cr-Si Coatings Deposited on Copper by Laser Cladding

Zhang, Peilei; Li, Mingchuan; Yu, Zhishui

doi:10.3390/ma11060875

Cited by 14 publications

(5 citation statements)

References 42 publications

(44 reference statements)

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“…[36]. Cr 3 Ni-based phases identified in the coating were also reported in recent literature, showing high hardness and excellent toughness in thermally sprayed Co-based materials [37,38]. Apart from enhancing the solidus point of the alloy, it has recently been reported that a high amount of Cr has a positive effect (in the case of brazing powders) on the shear strength and activation of the solution strengthening mechanism of the alloy [39].…”

Section: Xrd Diffraction Measurementsmentioning

confidence: 65%

Hot-Corrosion and Particle Erosion Resistance of Co-Based Brazed Alloy Coatings

Uţu

Hulka

Kazamer³

et al. 2022

Crystals

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Tape brazing constitutes a cost-effective alternative surface protection technology for complex-shaped surfaces. The study explores the characteristics of high-temperature brazed coatings using a cobalt-based powder deposited on a stainless-steel substrate in order to protect parts subjected to hot temperatures in a wear-exposed environment. Microstructural imaging corroborated with x-ray diffraction analysis showed a complex phased structure consisting of intermetallic Cr-Ni, C-Co-W Laves type, and chromium carbide phases. The surface properties of the coatings, targeting hot corrosion behavior, erosion, wear resistance, and microhardness, were evaluated. The high-temperature corrosion test was performed for 100 h at 750 °C in a salt mixture consisting of 25 wt.% NaCl + 75 wt.% Na2SO4. The degree of corrosion attack was closely connected with the exposure temperature, and the degradation of the material corresponding to the mechanisms of low-temperature hot corrosion. The erosion tests were carried out using alumina particles at a 90° impingement angle. The results, correlated with the microhardness measurements, have shown that Co-based coatings exhibited approximately 40% lower material loss compared to that of the steel substrate.

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Section: Xrd Diffraction Measurementsmentioning

confidence: 65%

Hot-Corrosion and Particle Erosion Resistance of Co-Based Brazed Alloy Coatings

Uţu

Hulka

Kazamer³

et al. 2022

Crystals

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“…In agreement with Jin's group, joining Ni and Cu is desirable because of the formation of Ni-Cu solid solutions and phases that can enhance the hardness, corrosion, and wear properties of heat exchanger tubes. For example, the laser cladding technique enhanced the microstructural properties of Ni-Cr-Si coatings deposited on copper substrates by Zhang et al [70]. The findings revealed the formation of Ni 2 Si dendritic phases at the top and columnar grains at the bottom, having an average microhardness of 900 HV0.1 (Figure 11).…”

Section: Materials Selection For Heat Exchangersmentioning

confidence: 95%

The potential use of laser cladded functionally graded materials to mitigate degradation in boiler tube heat exchangers for power plant applications: A review

Morake,

Mutua,

Ruthandi

et al. 2023

Surface Engineering

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Surface modification is essential to safeguard heat exchangers from premature failure spurred by deterioration mechanisms such as corrosion and wear, which diminish performance. Meanwhile, modifying some substrates with dissimilar materials is challenging due to a mismatch in material properties. Moreover, individual alloy coatings on substrates are usually insufficient in the required material properties, leading to accelerated failure of equipment, especially in power plant industries. This article summarised the knowledge base on functionally graded materials (FGMs) while emphasising how this promising class of novel materials can reduce deterioration. Additionally, laser cladding is established to be a suitable technique for processing FGMs. A particular focus is laid on the laser beam interaction with the FGM and expounding on the processing and material parameters that affect the microstructural properties of FGMs. The development prospects for processing FGMs with superior clad quality characteristics to increase boiler pipes' service life and performance are also highlighted.

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“…On the one hand, this effectively improves the reflectivity of the substrate to the laser, increases the powder utilization rate, and lowers the cost due to the pre-placement of the powder on the surface of the Cu substrate. On the other hand, adding the appropriate amount of nickel elements can reduce the thermal conductivity of Cu substrates and promote the formation of a melt pool during the laser cladding process as a consequence of the infinite solid solution of nickel and copper in the phase diagram [ 14 , 15 , 16 ]. However, increasing the internal porosity, surface contamination, or severe oxidation during the cladding process represent the common problems associated with the introduction of intermediate layers using pre-setting methods such as bonding or thermal spraying [ 17 , 18 , 19 , 20 , 21 , 22 , 23 ].…”

Section: Introductionmentioning

confidence: 99%

Microstructure and Properties of Nickel-Based Gradient Coatings Prepared Using Cold Spraying Combined with Laser Cladding Methods

et al. 2023

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A cold spray–laser cladding composite gradient coating (CLGC) was successfully formed on a Cu substrate. In comparison with traditional laser cladding gradient coatings (LGC), cold spraying the pre-set Ni-Cu alloy’s intermediate transition layer not only mitigates the negative impacts due to the high reflectivity of the copper substrate but also helps to minimize the difference in the coefficients of thermal expansion (CTE) between the substrate and coating. This reduces the overall crack sensitivity and improves the cladding quality of the coating. Besides this, the uniform distribution of hard phases in CLGC, such as Ni11Si12 and Mo5Si3, greatly increases its microhardness compared to the Cu substrate, thus resulting in the value of 478.8 HV0.5 being approximately 8 times that of the Cu substrate. The friction coefficient of CLGC is lowered compared to both the Cu substrate and LGC with respective values of 0.28, 0.54, and 0.43, and its wear rate is only one-third of the Cu substrate’s. These results suggest CLGC has excellent anti-wear properties. In addition, the wear mechanism was determined from the microscopic morphology and element distribution and was found to be oxidative and abrasive. This approach combines cold spraying and laser cladding to form a nickel-based gradient coating on a Cu substrate without cracks, holes, or other faults, thus improving the wear resistance of the Cu substrate and improving its usability.

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Microstructures Evolution and Micromechanics Features of Ni-Cr-Si Coatings Deposited on Copper by Laser Cladding

Cited by 14 publications

References 42 publications

Hot-Corrosion and Particle Erosion Resistance of Co-Based Brazed Alloy Coatings

Hot-Corrosion and Particle Erosion Resistance of Co-Based Brazed Alloy Coatings

The potential use of laser cladded functionally graded materials to mitigate degradation in boiler tube heat exchangers for power plant applications: A review

Microstructure and Properties of Nickel-Based Gradient Coatings Prepared Using Cold Spraying Combined with Laser Cladding Methods

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