scholarly journals Corrosion resistance of non-stoichiometric gadolinium zirconate fabricated by laser-enhanced chemical vapor deposition

2021 ◽  
Vol 10 (3) ◽  
pp. 520-528
Author(s):  
Chengguan Zhang ◽  
Yun Fan ◽  
Juanli Zhao ◽  
Guang Yang ◽  
Hongfei Chen ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Chemical Vapor Deposition ◽  
Service Life ◽  
Vapor Deposition ◽  
Chemical Vapor ◽  
Gadolinium Zirconate ◽  
Barrier Coating ◽  
Micro Cracks ◽  
Calcium Magnesium ◽  
Alumino Silicate

AbstractGadolinium zirconate (GZ) is a promising candidate for next-generation thermal barrier coating (TBC) materials. Its corrosion resistance against calcium-magnesium-alumino-silicate (CMAS) needs to be further increased for enhancing its in-service life. As the Gd element plays an important role in the CMAS resistance, three GZ coatings (GZ-0.75, GZ-1.0, and GZ-1.2) with different Gd/Zr atomic ratios are designed and deposited by laser enhanced chemical vapor deposition (LCVD) in this work. It is found that the generated Gd-apatite in GZ-1.2 would block micro-cracks inside the column structure and the inter-columnar gap more efficiently. Thus, the CMAS penetration rate (5.2 μm/h) of GZ-1.2 decreases over 27% comparing with GZ-1.0 and GZ-0.75, which is even lower than the Gd2Zr2O7 coatings fabricated by electron-beam physical vapor depositions (EB-PVDs). This work provides a feasible way to adjust the coating’s corrosion resistance and may guide the development of future coating for long in-service life.

Oxygen barrier coating deposited by novel plasma-enhanced chemical vapor deposition

2010 ◽  
Vol 115 (5) ◽  
pp. 2767-2772 ◽  
Author(s):  
Juan Jiang ◽  
Maike Benter ◽  
Rafael Taboryski ◽  
Klaus Bechgaard
Keyword(s):  
Chemical Vapor Deposition ◽  
Vapor Deposition ◽  
Chemical Vapor ◽  
Oxygen Barrier ◽  
Barrier Coating

scholarly journals Chemical Vapor Deposition of N-Doped Graphene through Pre-Implantation of Nitrogen Ions for Long-Term Protection of Copper

Materials ◽  
2021 ◽  
Vol 14 (13) ◽  
pp. 3751
Author(s):  
Luoqiao Han ◽  
Lei Dong ◽  
Haiyan Chen ◽  
Shuai Yang ◽  
Aiheng Yuan ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Chemical Vapor Deposition ◽  
Vapor Deposition ◽  
Galvanic Corrosion ◽  
Chemical Vapor ◽  
Pristine Graphene ◽  
Ambient Exposure ◽  
N Doping ◽  
Doped Graphene

Nitrogen-doped graphene (NG) was synthesized through the chemical vapor deposition (CVD) of graphene on Cu substrates, which were pre-implanted with N ions by the ion implantation method. The pre-implanted N ions in the Cu substrate could dope graphene by the substitution of C atoms during the CVD growth of graphene, forming NG. Based on this, NG’s long-term protection properties for Cu were evaluated by ambient exposure for a corrosion test. The results showed that NG can obviously reduce the natural oxidation of Cu in the long-term exposure compared with the case of pristine graphene (PG) coated on Cu. Moreover, with the increase in pre-implanted N dose, the formed NG’s long-term protection for Cu improved. This indicates that the modification of graphene by N doping is an effective way to improve the corrosion resistance of the PG coating owing to the reduction in its conductivity, which would inhibit galvanic corrosion by cutting off electron transport across the interface in their long-term protection. These findings provide insight into corrosion mechanisms of the graphene coating and correlate with its conductive nature based on heteroatoms doping, which is a potential route for improving the corrosion resistance of graphene as an effective barrier coating for metals.

Effect of Compressive Residual Stress on Film Formed by Mechanochemical Multifunction Cavitation Processing

2021 ◽  
Vol 1016 ◽  
pp. 574-579
Author(s):  
Masataka Ijiri ◽  
Fumihiro Kato ◽  
Daisaku Maeda ◽  
Daichi Shimonishi ◽  
Toshihiko Yoshimura
Keyword(s):  
Residual Stress ◽  
Corrosion Resistance ◽  
Chemical Vapor Deposition ◽  
Fatigue Strength ◽  
Phosphoric Acid ◽  
Vapor Deposition ◽  
Compressive Residual Stress ◽  
Chemical Vapor ◽  
Al Alloys ◽  
Magnesium Surface

Recently, mechanochemical multifunction cavitation (MC-MFC) was developed to improve the corrosion resistance of the magnesium surface. MFC is a technology that combines water jet peening and ultrasound cavitation. MC-MFC is a technology that adds phosphoric acid to water. It can improve the corrosion resistance by forming a phosphate film on the Mg surface. Conventional anodic oxidation, plating, and chemical vapor deposition can improve corrosion resistance by forming a film on the Mg surface, but it is difficult to improve characteristics such as compressive residual stress on the surface. MFC-treated surfaces have previously imparted various properties such as imparting compressive residual stress necessary to improve the fatigue strength to Al alloys and Cr-Mo steels. In this study, the effect of film formed on MC-MFC processed surface on compressive residual stress was investigated.

Increasing Surface Hardness of S304 Stainless Steel by High Quality Graphene Grown by Chemical Vapor Deposition

2020 ◽  
Vol 302 ◽  
pp. 79-84
Author(s):  
Piyaporn Surinlert ◽  
Akkawat Ruammaitree
Keyword(s):  
Stainless Steel ◽  
Corrosion Resistance ◽  
Chemical Vapor Deposition ◽  
Carbon Source ◽  
Vapor Deposition ◽  
Surface Hardness ◽  
Chemical Vapor ◽  
High Quality ◽  
Methane Gas ◽  
Intrinsic Strength

Stainless steel is widely utilized due to its higher corrosion resistance and gloss than ordinary steels. However, the applications of stainless steel are still limited because of its low surface hardness. Graphene is a superb material, which has an intrinsic strength of 130 GPa. In this report, the growth of high quality graphene on S304 stainless steel by chemical vapor deposition using acetylene gas as a carbon source is demonstrated. The surface hardness of stainless steel after growing high quality graphene is investigated by nanoindentation technique. High quality graphene can increase the surface hardness of stainless steel from 1.54 GPa to 10.08 GPa. Moreover, the effect of graphene quality on the surface hardness of S304 stainless steel is studied. High quality graphene grown by CVD using acetylene gas as a carbon source can increase the surface hardness of stainless steel about two times more than low quality graphene grown by using methane gas.

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