Phase Transformation-Induced Improvement in Hardness and High-Temperature Wear Resistance of Plasma-Sprayed and Remelted NiCrBSi/WC Coatings

Sha, Jin; Chen, Liang Yu; Liu, Yitong; Yao, Zengjian; Lu, Sheng; Wang, Zexin; Zang, Qianhao; Mao, Shuhua; Zhang, Lai-Chang

doi:10.3390/met10121688

Cited by 21 publications

(5 citation statements)

References 74 publications

(98 reference statements)

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“…The total area of pores for S20 is only 719 ± 322 μm 2 , which is about 20.5% lower than that for the as-sprayed NiCrBSi coating. The elimination of pores can be attributed to two aspects: (i) the elemental diffusion at the edge of pores and (ii) the flow of melt filling the pores [19,20]. According to the previous work [19], the temperature of the coating surface is found to exceed 1500 °C when remelted at 30 kW.…”

Section: Analysis Of the Pores At The Coating/substrate Interfacesmentioning

confidence: 87%

“…The coatings with low bond strength are prone to be peeled off from the substrate, and therefore, lead to the invalidation of the product. Take the NiCrBSi alloy coating as an example, such an alloy coating is frequently used in engines, piston rods, and boilers because the NiCrBSi alloy has the advantages of high wear and high corrosion resistance [19,20]. In previous works, two methods for measuring the bond strength of NiCrBSi coatings (as well as other plasma-sprayed coatings) are mainly reported.…”

Section: Introductionmentioning

confidence: 99%

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A New Method for Evaluating the Bond Strength of Plasma-Sprayed NiCrBSi Coatings

Chen

Liu

Xuan

et al. 2022

Metals

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The bond strength is a critical consideration for the plasma-sprayed NiCrBSi coatings. However, the conventional methods for testing the bond strength of NiCrBSi coatings always cost time and money. If there is a simple method that could predict the bond strength of the prepared NiCrBSi coatings without destroying the coatings, it would be significantly beneficial for industrial applications. In this work, a new method was proposed based on the total areas of the interfacial pores for the NiCrBSi coatings. The NiCrBSi coating was prepared by plasma spraying technology and the as-sprayed coating was subsequently remelted by plasma arc using the powers of 20 kW, 25 kW, and 30 kW, respectively. The interfacial microstructures, the size distributions and total areas of the interfacial pores, interfacial hardness, and bond strength of all prepared coating samples were investigated. After remelting, the number and the total area of interfacial pores decrease with increasing the remelting power. Correspondingly, the interfacial hardness and bond strength of coatings increase with increasing the remelting power The bond strength of coatings basically has a linear relationship with the total area of interfacial pores. The built relationship may be used to predict the bond strength of NiCrBSi coatings.

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Section: Analysis Of the Pores At The Coating/substrate Interfacesmentioning

confidence: 87%

Section: Introductionmentioning

confidence: 99%

A New Method for Evaluating the Bond Strength of Plasma-Sprayed NiCrBSi Coatings

Chen

Liu

Xuan

et al. 2022

Metals

Self Cite

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“…The best known technologies for the post-treatment are flame, furnace, laser remelting, and induction [2,[6][7][8][9]. The most commonly applied technology is flame remelting because of the low cost and ease of handle.…”

Section: Introductionmentioning

confidence: 99%

Comparison of Ni-Based Self-Fluxing Remelted Coatings for Wear and Corrosion Applications

Kazamer¹,

Muntean

Vălean

et al. 2021

Materials

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The present study investigates the possibility to apply a vacuum furnace thermal post-treatment as an alternative solution for flame sprayed NiCrBSi wear and corrosion-resistant coatings, deposited on a low alloyed structural steel. The controlled atmosphere offers advantages regarding the fusion of the coating, porosity reduction, and degassing. An improvement of the applied heating-cooling cycle was performed through the variation of time and temperature. The best performing samples were selected by comparing their porosity and roughness values. The chosen samples were subsequently characterized regarding their microstructure, microhardness, sliding wear, and corrosion behavior. The experimental work confirms that the use of a vacuum remelting post-process reduces the porosity below 1% and leads to the formation of a larger quantity of hard boron-containing phases, promoting a significant decrease of the wear rate, while maintaining a good corrosion behavior.

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“…[ 14 ] Second, the interdiffusion reactions between Ni–Ti can improve surface hardness and bonding strength between titanium and Ni coating. [ 15–17 ] Finally, Ni–Ti intermetallic compounds have good breaking strength, eminent wear property, and good corrosion resistance. [ 18–20 ] However, there are few researches on the failure process of Ni coated Ti alloy.…”

Section: Introductionmentioning

confidence: 99%

Failure Process Observation and Failure Mechanism of Ni‐Coated TC4 Alloy by Gradually Changed Curvature Bending Method

et al. 2021

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To observe the failure process of coating/substrate materials, a gradually changed curvature bending (GCCB) method is proposed, and the relevant equipment is developed. Before GCCB experiment, Ni-coated Ti6Al4V (TC4) samples were prepared. The effect of vacuum heat treatment on the microstructure at Ti/Ni interface is discussed. With the increase in heat treatment time, intermetallic compounds of TiNi 3 , TiNi, and Ti 2 Ni start to form. Kirkendall void forms in Ni coating at first, and then the pore number decreases due to interdiffusion. Based on the interdiffusion of Ni into TC4 substrate, β-Ti phase forms at the surface region. The whole failure process of Ni-coated TC4 sample by GCCB experiment is observed and analyzed. With the increase in bending curvature, the fracture order of each layer is TiNi 3 > Ti 2 Ni > TiNi. With the increase in heat treatment time, the bonding property of the coating first increases and then decreases, and the failure mode also changes. The failure occurs at TiNi 3 layer when the heat treatment time is 60 min. When the heat treatment time is 120 min, the bonding property of the coating is the highest and surface vertical crack occurs. When treated 180 min, failure occurs at Ti 2 Ni layer.

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Phase Transformation-Induced Improvement in Hardness and High-Temperature Wear Resistance of Plasma-Sprayed and Remelted NiCrBSi/WC Coatings

Cited by 21 publications

References 74 publications

A New Method for Evaluating the Bond Strength of Plasma-Sprayed NiCrBSi Coatings

A New Method for Evaluating the Bond Strength of Plasma-Sprayed NiCrBSi Coatings

Comparison of Ni-Based Self-Fluxing Remelted Coatings for Wear and Corrosion Applications

Failure Process Observation and Failure Mechanism of Ni‐Coated TC4 Alloy by Gradually Changed Curvature Bending Method

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