Thermally induced metallurgical processes in Cr3C2-NiCr thermal spray coatings as a function of carbide dissolution

Matthews, Steven; Asadov, A.; Ruddell, Sarah; Berger, Lutz‐Michael

doi:10.1016/j.jallcom.2017.08.246

Cited by 34 publications

(4 citation statements)

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“…Examination by X-ray phase analysis of the composite coating shows that in the composition can be identified Cr 3 C 2 chromium carbide and NiCr matrix material and the Al phase. Phase analysis performed on the basis of diffraction studies, except for the occurrence of the ceramic phase Cr 3 C 2 and metallic phases NiCr and Al, did not show any new phases formed during spraying ( Figure 5), i.e., carbides Cr 7 C 3 and Cr 23 C 6 , formed in the decarbonisation process of Cr 3 C 2 carbide [13]. X-ray examinations do not confirm the occurrence of these carbide phases because the main diffraction peaks Cr 7 C 3 and Cr 23 C 6 coincide with the lines corresponding to the phases NiCr and Cr 3 C 2 [14].…”

Section: Resultsmentioning

confidence: 99%

Microstructure, Mechanical Properties and Wear Behavior of High-Velocity Oxygen-Fuel (HVOF) Sprayed (Cr3C2-NiCr+Al) Composite Coating on Ductile Cast Iron

Książek

Tchórz

2019

Coatings

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In the present work Cr3C2-NiCr powder containing Al particles was deposited on ductile cast iron with high-velocity oxy-fuel (HVOF) thermal spray coating technique. An investigation was conducted to determine the role of Al particles in the Cr3C2-NiCr coating produced with HVOF technique on microstructure, mechanical and wear properties in a system Cr2C3-NiCr coating/ductile cast iron. The microstructure of the HVOF-sprayed Cr3C2-NiCr+Al coating was characterized by light microscopy, X-ray diffraction (XRD), scanning electron microscope (SEM), transmission electron microscope (TEM) and energy dispersive X-ray spectroscopy (EDS). Microstructure analysis reveals the formation of coating with low porosity, good adhesion to the substrate and dense structure with irregularly shaped particles of Al arranged in strips and finely fragmented Cr3C2 particles embedded in a nanocrystalline Ni-Cr alloy matrix. In addition, the results were discussed in reference to examination of bending strength considering cracking and delamination in the system of (Cr3C2-NiCr+Al)/ductile cast iron as well as microhardness and wear resistance of the coating. It was found that the addition of Al particles significantly increased resistance to cracking and wear behaviour in the studied system.

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Section: Resultsmentioning

confidence: 99%

Microstructure, Mechanical Properties and Wear Behavior of High-Velocity Oxygen-Fuel (HVOF) Sprayed (Cr3C2-NiCr+Al) Composite Coating on Ductile Cast Iron

Książek

Tchórz

2019

Coatings

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“…Matthews et al [67] sprayed Cr 3 C 2 -NiCr coatings using two HVOF technologies and plasma coating techniques to produce samples with broad-spectrum carbide dissolution and peritectic decomposition of Cr 3 C 2 . It was found that coated plasma spraying was very effective in reducing carbon loss and oxygen absorption.…”

Section: (4) Nanostructured Ni-based Alloy Coatingsmentioning

confidence: 99%

Technical Characteristics and Wear-Resistant Mechanism of Nano Coatings: A Review

et al. 2020

Coatings

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Nano-coating has been a hot issue in recent years. It has good volume effect and surface effect, and can effectively improve the mechanical properties, corrosion resistance and wear resistance of the coatings. It is important to improve the wear resistance of the material surface. The successful preparation of nano-coatings directly affects the application of nano-coatings. Firstly, the preparation methods of conventional surface coatings such as chemical vapor deposition and physical vapor deposition, as well as the newly developed surface coating preparation methods such as sol-gel method, laser cladding and thermal spraying are reviewed in detail. The preparation principle, advantages and disadvantages and the application of each preparation method in nano-coating are analyzed and summarized. Secondly, the types of nano-coating materials are summarized and analyzed by inorganic/inorganic nanomaterial coatings and organic/inorganic nanomaterial coatings, and their research progress is summarized. Finally, the wear-resistant mechanism of nano-coatings is revealed from three aspects: grain refinement, phase transformation toughening mechanism and nano-effects. The application prospects of nano-coatings and the development potential combined with 3D technology are prospected.

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“…Cr 3 C 2 -NiCr coatings are widely used in industrial equipment such as aircrafts, heat exchanger components and power recovery turbine [1] due to their excellent performance for oxidation, corrosion and wear protections [2][3][4][5][6]. Combining the high wear resistance from Cr 3 C 2 and the excellent oxidation and corrosion resistance from the binder phase (NiCr), Cr 3 C 2 -NiCr coatings can provide erosive [7,8] sliding wear [9] and abrasive [6,10] protections under a wide range of operating temperatures (i.e., >500 • C) and even in aggressive environments [5,11,12]. Due to their high-temperature applications, it has raised increasing interests to improve the tribological properties at elevated temperatures of Cr 3 C 2 -NiCr coatings.…”

Section: Introductionmentioning

confidence: 99%

“…Previous studies show that during high temperature exposure, Cr 3 C 2 -NiCr coatings are subjected to a variety of compositional and microstructural evolution including precipitation of carbides, equilibrium of Ni(Cr) saturated solid solutions and formation of oxide layers [1,7], which will have a large impact on the mechanical properties (i.e., hardness and toughness) and thus the wear behavior of the coatings [13][14][15][16]. High-temperature annealing is therefore considered as one of the effective methods to improve the wear performance of Cr 3 C 2 -NiCr coatings.…”

Section: Introductionmentioning

confidence: 99%

Room-Temperature and High-Temperature Wear Behaviors of As-Sprayed and Annealed Cr3C2-25NiCr Coatings Prepared by High Velocity Air-Fuel Spraying

2020

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Cr3C2-25NiCr coatings were deposited on stainless steel substrates by high velocity air-fuel (HVAF) spraying. Friction and wear behaviors of as-sprayed and annealed coatings were investigated both at room-temperature (RT) and 600 °C (high-temperature, HT). The results show that annealing at 600 °C in air is effective to enhance the wear performances of the coating both at RT and HT. The enhanced wear resistance of annealed coatings is discussed from the oxide growth and the microstructural evolution of the coatings. The wear behavior of the annealed coating follows the abrasive mechanism at RT and changes to an oxidative wear at HT, in which formation of a tribo-oxide layer plays a critical role to reduce the friction coefficient and to protect the underlying coatings from abrasive damage. The findings of this work reveal the significance of oxide-scale growth and microstructural evolution on the HT wear behaviors of the Cr3C2-25NiCr coating, which provides strategies for enhancing the wear properties of such coatings for HT applications.

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Thermally induced metallurgical processes in Cr3C2-NiCr thermal spray coatings as a function of carbide dissolution

Cited by 34 publications

References 50 publications

Microstructure, Mechanical Properties and Wear Behavior of High-Velocity Oxygen-Fuel (HVOF) Sprayed (Cr3C2-NiCr+Al) Composite Coating on Ductile Cast Iron

Microstructure, Mechanical Properties and Wear Behavior of High-Velocity Oxygen-Fuel (HVOF) Sprayed (Cr3C2-NiCr+Al) Composite Coating on Ductile Cast Iron

Technical Characteristics and Wear-Resistant Mechanism of Nano Coatings: A Review

Room-Temperature and High-Temperature Wear Behaviors of As-Sprayed and Annealed Cr3C2-25NiCr Coatings Prepared by High Velocity Air-Fuel Spraying

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