Aluminum phosphate sealing to improve insulation resistance of plasma-sprayed alumina coating

Vetrivendan, E.; Thendral, G.; Shankar, A. Ravi; Mallika, C.; Mudali, U. Kamachi

doi:10.1080/10426914.2017.1339321

Cited by 22 publications

(6 citation statements)

References 18 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It should be noted that AlPO 4 cannot be used as the dominate material of coatings. Because a great shrinkage will be usually caused by the dehydration and phase transition of AlPO 4 , leading to a loose porous structure, which cannot prevent deuterium permeation 41,42 . Deuterium permeability of the α‐Al 2 O 3 /AlPO 4 coating is 1.42 × 10 −15 mol/(m s)/Pa 0.5 at 400°C and 1.32 × 10 −15 mol/(m s)/Pa 0.5 at 450°C.…”

Section: Resultsmentioning

confidence: 99%

“…Because a great shrinkage will be usually caused by the dehydration and phase transition of AlPO 4 , leading to a loose porous structure, which cannot prevent deuterium permeation. 41,42 Deuterium permeability of the α-Al 2 O 3 /AlPO 4 coating is 1.42 × 10 −15 mol/(m s)/Pa 0.5 at 400 • C and 1.32 × 10 −15 mol/(m s)/Pa 0.5 at 450 • C. Accordingly, the PRF is 915 at 400 • C and 1935 at 450 • C, which means the α-Al 2 O 3 /AlPO 4 coating enhanced the deuterium resistance of the substrate by above three orders of magnitude. Even though deuterium permeability of the α-Al 2 O 3 /AlPO 4 coating is similar to each other at 400 and 450 • C, the permeability of the substrate at 450 • C is above two times that at 400 • C, leading to a significant increase in PRF value from 915 to 1935 on the basis of Equation ( 2).…”

Section: Deuterium Permeation Reduction Of the α-Al 2 O 3 Composite C...mentioning

confidence: 99%

See 1 more Smart Citation

Thermochemically synthesized α‐Al₂O₃ composite coating with high bonding strength and deuterium permeation resistance

Li,

Zheng,

Liu

et al. 2023

J Am Ceram Soc.

View full text Add to dashboard Cite

Hydrogen isotope permeation in structural steels can cause severe issues, including steel brittleness, fuel loss, and radioactive pollution in fusion reactors. To tackle this issue, we report a simple synthesis of α‐Al2O3/AlPO4 composite coating by the thermochemical reaction method to serve as an effective barrier hampering hydrogen isotope permeation. This coating was formed at 500°C and composed of α‐Al2O3 and AlPO4 phases. A relatively uniform and compact structure with thickness of ∼35 μm made its corrosion resistance reaching above 3000 times that of the 321 steel substrate. With just one‐side coated, the α‐Al2O3/AlPO4 coating achieved a considerable deuterium permeation reduction factor of 1935 at 450°C, three orders of magnitude higher than 321 steels. What's more, after the deuterium permeation test, no pores or cracks were generated. The excellent bonding between the coating and the substrate was resulted from the formation of CrxPy at their interface induced by Cr diffusion from the substrate. The results obtained from the current study shed new light on seeking reliable and viable ceramic coatings to tackle hydrogen permeation issues.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Deuterium Permeation Reduction Of the α-Al 2 O 3 Composite C...mentioning

confidence: 99%

Thermochemically synthesized α‐Al₂O₃ composite coating with high bonding strength and deuterium permeation resistance

Li,

Zheng,

Liu

et al. 2023

J Am Ceram Soc.

View full text Add to dashboard Cite

show abstract

“…In case of plasma-sprayed alumina coating, Vetrivendan et al [19] recently also used the aluminum phosphate sealing to improve insulation resistance of their alumina coating. In their study, three values of concentrations of P/Al (molar ratio) were 3, 10, and 15.…”

Section: Corrosion Testmentioning

confidence: 99%

Arc Thermal Spray NiCr20 Alloy Coating: Fabrication, Sealant, Heat Treatment, Wear, and Corrosion Resistances

Nguyen

Thu

Nguyen

et al. 2019

International Journal of Electrochemistry

View full text Add to dashboard Cite

This study presents the effect of heat treatment on porosity, phase composition, microhardness, and wear and corrosion resistances of the thermal sprayed NiCr20 coating after sealing with aluminum phosphate. The annealing temperatures were varied in a range of 400 to 1000°C. The obtained results indicated the porosity of coating decreased with increasing the annealing temperature. After treatment at temperatures in range of 800-1000°C, more than 90% of initial pores in the coating were successfully filled with the sealants. The XRD data revealed not only the formation of new phases of other compounds, but also the interaction between coating and sealant. After heat treatment, wear resistance of coating was 12 times higher than that without heat treatment. The corrosion test in H2SO4 solution indicated that the presence of sealant in coatings increased their corrosion resistance. From these findings, application of these NiCr20 coatings to protect steel against wear and corrosion appears very promising.

show abstract

“…Chemically bonded ceramic coating (CBC) has been widely used to prevent metal from corrosion and wear damage because of its low curing temperature and easy preparation [1][2][3][4]. However, the porous structure due to curing process has an adverse impact on the tribological and corrosion properties of CBC [5].…”

Section: Introductionmentioning

confidence: 99%

Investigation of tribological and corrosion properties in ceramic/PTFE coating

Bian

Yongwu

et al. 2022

Surface Engineering

View full text Add to dashboard Cite

Tribological and corrosion properties of chemically bonded ceramic coating (CBC) is limited due to the porous structure. To overcome the limitation, polytetrafluoroethylene (PTFE) is infiltrated into CBC by vacuum impregnation, and the related tribological and corrosion properties are investigated. CBC with the infiltration of PTFE (CBC/PTFE) shows a lower coefficient of friction than CBC because a transfer lubricant film is formed due to PTFE. In addition, the wear resistance is also improved with the infiltration of PTFE. Besides, CBC/ PTFE possesses a better corrosion resistance attributing to the excellent hydrophobicity of PTFE and the compact layer caused by the filling of PTFE into the pores of CBC.

show abstract

Aluminum phosphate sealing to improve insulation resistance of plasma-sprayed alumina coating

Cited by 22 publications

References 18 publications

Thermochemically synthesized α‐Al₂O₃ composite coating with high bonding strength and deuterium permeation resistance

Thermochemically synthesized α‐Al₂O₃ composite coating with high bonding strength and deuterium permeation resistance

Arc Thermal Spray NiCr20 Alloy Coating: Fabrication, Sealant, Heat Treatment, Wear, and Corrosion Resistances

Investigation of tribological and corrosion properties in ceramic/PTFE coating

Contact Info

Product

Resources

About

Aluminum phosphate sealing to improve insulation resistance of plasma-sprayed alumina coating

Cited by 22 publications

References 18 publications

Thermochemically synthesized α‐Al2O3 composite coating with high bonding strength and deuterium permeation resistance

Thermochemically synthesized α‐Al2O3 composite coating with high bonding strength and deuterium permeation resistance

Arc Thermal Spray NiCr20 Alloy Coating: Fabrication, Sealant, Heat Treatment, Wear, and Corrosion Resistances

Investigation of tribological and corrosion properties in ceramic/PTFE coating

Contact Info

Product

Resources

About

Thermochemically synthesized α‐Al₂O₃ composite coating with high bonding strength and deuterium permeation resistance

Thermochemically synthesized α‐Al₂O₃ composite coating with high bonding strength and deuterium permeation resistance