Development of thick SiC coating on thin wall tube of zircaloy-4 using laser based directed energy deposition technique

Kumar, Arun; Srinivasulu, B.; Paul, C. P.; Singh, Rashmi; Kumar, Sanjay; Mishra, Govind Kumar; Bontha, Srikanth; Bindra, K. S.

doi:10.1016/j.surfcoat.2020.126088

Cited by 19 publications

(7 citation statements)

References 38 publications

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“…The matching between input and output powers was automatically adjusted by the frequency control around 2 MHz in an RF-power generator. Thick SiC coatings were highlighted in the literature [19,20]. Among them, a thermal CVD system (Shinko-Seiki, Co., Ltd.; Kobe, Japan) was used to achieve carbon supersaturation to the co-deposited βSiC coating onto the SiC die substrate by controlling the carbon source gas flow rate.…”

Section: Two Carbon Supersaturation Processesmentioning

confidence: 99%

In Situ Lubrication in Forging of Pure Titanium Using Carbon Supersaturated Die Materials

Aizawa,

Funazuka,

Shiratori

2024

Nanomaterials

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A new solid lubrication method was proposed for dry forging of pure titanium with high reduction in thickness. A free-carbon tribofilm was formed in situ at the hot spots on the contact interface to protect the die surfaces from severe adhesion of work materials. This film consisted of the free carbon, which isolated from the carbon supersaturated die substrate materials, diffused to the contact interface and agglomerated to a thin film. Two different routes of carbon supersaturation process were developed to prepare carbon supersaturated ceramic and metal dies for the dry forging of pure titanium wires. A pure titanium bar was utilized as an easy-to-adherent work material for upsetting in dry and cold. The round bar was upset up to 70% in reduction in thickness with a low friction coefficient from 0.05 to 0.1 in a single stroke. Work hardening was suppressed by this low friction. SEM-EDX, EBSD and Raman spectroscopy were utilized to analyze the contact interface and to understand the role of in situ formed free-carbon films on the low friction and low work hardening during forging. Precise nanostructure analyses were utilized to describe low friction forging behavior commonly observed in these two processes. The in situ solid lubrication mechanism is discussed based on the equivalence between the nitrogen and carbon supersaturation processes.

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Section: Two Carbon Supersaturation Processesmentioning

confidence: 99%

In Situ Lubrication in Forging of Pure Titanium Using Carbon Supersaturated Die Materials

Aizawa,

Funazuka,

Shiratori

2024

Nanomaterials

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“…Whereas at the same moderate to high amalgam flowrates, the WC‐coated SS‐304 packing accommodates high volumes of amalgam in inner tubular region owing to good wetting characteristics of SS‐304 surface in addition to providing ample surface area for H 2 evolution on outer (WC‐coated) surface of packing. The WC coating on outer surface of SS‐304 tube was obtained by an indigenously developed LDED technique 23 . Among the carbides of above‐mentioned transition metals, the powders of tungsten carbide (WC) are the most inexpensive and abundantly available commercially, thus making WC coating the most suitable for coating the outer surface of tubular SS‐304 substrate using LDED technique.…”

Section: Introductionmentioning

confidence: 99%

“…The WC coating on outer surface of SS-304 tube was obtained by an indigenously developed LDED technique. 23 Among the carbides of above-mentioned transition metals, the powders of tungsten carbide (WC) are the most inexpensive and abundantly available commercially, thus making WC coating the most suitable for coating the outer surface of tubular SS-304 substrate using LDED technique. In the present work, a numerical 3D-1D model was developed to study the kinetics of sodium amalgam decomposition in fixed bed of WC-coated tubular SS-304 packing with three different ratios of outer to inner tube diameters, and the axial rate profiles of amalgam decomposition were compared with fixed bed composed of spherical graphite packing for different values of inlet amalgam flowrate and inlet sodium amalgam concentration at various time intervals.…”

Section: Introductionmentioning

confidence: 99%

Decomposition kinetics of sodium amalgam in fixed bed of WC‐coated tubular SS‐304 packing: Modelling and validation

Manivannan

Mandal

Dabhade

et al. 2023

Asia-Pacific J Chem Eng

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Erosion of graphite packing in continuously operating fixed bed sodium amalgam decomposers leads to performance degradation accompanied by clogging in the downstream process lines which not only increases the maintenance and catalyst refilling costs but also aggravates the risk of mercury vapour exposure. To overcome this drawback, the present work utilizes tubular SS-304 packing coated with tungsten carbide (WC) on the outer surface. The coating is obtained using an indigenously developed laser-directed energy deposition facility. Dedicated experimental setup is developed for each set of process parameters to comparatively study the fixed bed decomposition kinetics at steady state for three types of WC-coated SS-304 packing and a conventional spherical graphite packing. In parallel, a numerical 3D-1D model is implemented using open source computational solvers and is experimentally validated. The algorithm of this model is based on proposed drop-fill approach for WC-coated SS-304 packing and modified drop approach for spherical graphite packing, respectively. In terms of decomposition rates, the performance of WC-coated SS-304 packing surpasses that of spherical graphite packing at high amalgam flowrates; meanwhile, the average alteration in experimental steadystate temperature profile after continuous operation of 2 years is around 2% for WC-coated SS-304 packing as compared to nearly 17% for spherical graphite packing.

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“…It could be used for multiple high-value applications, such as aerospace moving components [2,3], die coat-ings [4,5], metallic tools [6,7], and other aggressive environments where low density and high-temperature capabilities are required. The SiC coatings could be typically produced using physical or chemical vapour deposition (PVD or CVD) [8,9], magnetron sputtering [10,11], dynamic ion mixing [12,13], and laser-assisted deposition [14,15]. On the other hand, thermal spraying methods enjoy high deposition rates, are economical compared to the listed methods, and are adaptable at different scales, such as wind turbine or hydropower industries.…”

Section: Introductionmentioning

confidence: 99%

A new hybrid suspension and solution precursor thermal spray for wear-resistant silicon carbide composite coatings

et al. 2022

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Development of thick SiC coating on thin wall tube of zircaloy-4 using laser based directed energy deposition technique

Cited by 19 publications

References 38 publications

In Situ Lubrication in Forging of Pure Titanium Using Carbon Supersaturated Die Materials

In Situ Lubrication in Forging of Pure Titanium Using Carbon Supersaturated Die Materials

Decomposition kinetics of sodium amalgam in fixed bed of WC‐coated tubular SS‐304 packing: Modelling and validation

A new hybrid suspension and solution precursor thermal spray for wear-resistant silicon carbide composite coatings

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