Water vapor corrosion test using supersonic gas velocities

Water vapor corrosion behavior of Ln2Si2O7 (Ln = Nd, Er, Lu), mullite, CaYb4Si3O13 and Al2O3 were investigated at 1500°C. In Ln2Si2O7 phases, Ln = Nd and Er samples were completely dissolved in water vapor environment. CaYb4Si3O13 phase underwent decomposition during the corrosion test. Lu2Si2O7 and mullite showed excellent water vapor corrosion protection. In the case of mullite, Al2O3 rich phase was formed on the surface and the corrosion progression was successfully protected. In the case of Lu2Si2O7 phase, phase transition occurred and the grain boundaries of surface layer were slightly corroded by the corrosion test.

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Comparison of Water Vapor Corrosion Behaviors of Ln2Si2O7 (Ln=Yb and Lu) and ASiO4 (A=Ti, Zr and Hf) EBC's

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.317-318.557 ◽

2006 ◽

Vol 317-318 ◽

pp. 557-560 ◽

Cited By ~ 15

Author(s):

Shunkichi Ueno ◽

Daniel Doni Jayaseelan ◽

Hideki Kita ◽

Tatsuki Ohji ◽

Hua Tay Lin

Keyword(s):

Thermal Expansion ◽

Corrosion Resistance ◽

Water Vapor ◽

Silicon Nitride ◽

Corrosion Test ◽

Coated Sample ◽

Reaction Sintering ◽

Thermal Expansion Mismatch ◽

Corrosion Behaviors ◽

Water Vapor Corrosion

The corrosion behaviors of Ln2Si2O7 (Ln=Yb and Lu) and ASiO4 (A=Ti, Zr and Hf) EBC's were examined at 1500oC in water vapor environment. These oxides were coated on silicon nitride specimens by oxidation-bonded reaction sintering technique. Among Ln2Si2O7 system, though the thermal expansion coefficient of Yb2Si2O7 phase is closer to silicon nitride than that of Lu2Si2O7 phase, the corrosion resistance of silicon nitride with Lu2Si2O7 EBC was higher than that of Yb2Si2O7 EBC sample. In these EBC materials, boundary silica phase was easily corroded by water vapor. Among ASiO4 system, though the corrosion rate of HfSiO4 bulk was larger than that of ZrSiO4 and TiSiO4 phases, the oxidation of the silicon nitride substrate for HfSiO4 coated sample was smaller than that of other two. Many cracks were in ASiO4 EBC layer during the corrosion test. The introduced crack length in HfSiO4 EBC layer is shorter than in ZrSiO4 EBC layer due to the thermal expansion mismatch between EBC materials and the silicon nitride substrate.

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Water vapor corrosion of mullite containing small amount of sodium

Ceramics International ◽

10.1016/j.ceramint.2004.03.044 ◽

2005 ◽

Vol 31 (1) ◽

pp. 177-180 ◽

Cited By ~ 17

Author(s):

Shunkichi Ueno ◽

D. Doni Jayaseelan ◽

Naoki Kondo ◽

Tatsuki Ohji ◽

Shuzo Kanzaki

Keyword(s):

Water Vapor ◽

Water Vapor Corrosion

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Water-Vapor Corrosion of Beryllia

Sixty-fourth Annual Meeting of the Society ◽

10.1520/stp44392s ◽

2009 ◽

pp. 146-146-8

Author(s):

CC Browne

Keyword(s):

Water Vapor ◽

Water Vapor Corrosion

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Internal Friction Behavior of SiC Ceramics Subjected to Water Vapor Corrosion

Ceramic Transactions Series - High Temperature Ceramic Matrix Composites 8 ◽

10.1002/9781118932995.ch33 ◽

2014 ◽

pp. 311-316

Author(s):

Zhiliang Hong ◽

Laifei Cheng ◽

Chunnian Zhao ◽

Xiufeng Han ◽

Litong Zhang ◽

...

Keyword(s):

Water Vapor ◽

Internal Friction ◽

Friction Behavior ◽

Sic Ceramics ◽

Water Vapor Corrosion

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Towards chrome-free lining for plasma gasifiers using the CA6-SiC castable based on high-temperature water vapor corrosion

Ceramics International ◽

10.1016/j.ceramint.2019.03.175 ◽

2019 ◽

Vol 45 (9) ◽

pp. 12429-12435

Author(s):

Ding Chen ◽

Huazhi Gu ◽

Ao Huang ◽

Hongwei Ni

Keyword(s):

Water Vapor ◽

High Temperature ◽

High Temperature Water ◽

Water Vapor Corrosion ◽

Temperature Water

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ChemInform Abstract: WATER VAPOR CORROSION OF LAMELLAR, SUPERPLASTIC AND CAST DENDRITIC ZN-21AL ALLOY

Chemischer Informationsdienst ◽

10.1002/chin.198430016 ◽

1984 ◽

Vol 15 (30) ◽

Author(s):

G. TORRES-VILLASENOR ◽

A. UGALDE ◽

L. HERNANDEZ ◽

I. L. SINGER

Keyword(s):

Water Vapor ◽

Water Vapor Corrosion

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Water vapor corrosion behavior of lutetium silicates at high temperature

Ceramics International ◽

10.1016/j.ceramint.2005.03.022 ◽

2006 ◽

Vol 32 (4) ◽

pp. 451-455 ◽

Cited By ~ 11

Author(s):

Shunkichi Ueno ◽

D. Doni Jayaseelan ◽

Tatsuki Ohji

Keyword(s):

Water Vapor ◽

High Temperature ◽

Corrosion Behavior ◽

Water Vapor Corrosion

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Water vapor and CMAS corrosion tests of Si/Y2SiO5 Thermal and Environmental Barrier Coating

10.21203/rs.3.rs-889492/v1 ◽

2021 ◽

Author(s):

Qi Zhang ◽

Xueqin Zhang ◽

Zhuang Ma ◽

Ling Liu ◽

Yanbo Liu ◽

...

Keyword(s):

Water Vapor ◽

High Temperature ◽

Corrosion Test ◽

Environmental Barrier ◽

Alkali Salt ◽

High Temperature Water ◽

Environmental Barrier Coating ◽

Barrier Coating ◽

High Temperature Steam ◽

Temperature Water

Abstract Thermal and environmental barrier coating (TEBC), the up-to-date concept, is introduced to protect silicon-based ceramics matrix composites (CMC) from not only high temperature water vapor but also the alkali salt from volcanic ash and dust suspending in atmosphere. Because both of high temperature steam and CMAS will make Si-based CMC deteriorate rapidly. By executing the corrosion test against high temperature water vapor, we find that Si/Y2SiO5 double-layer TEBC can effectively protect SiCf/SiC CMC from water vapor at 1300 ℃ for over 205 hours. Almost all Y2SiO5 transform into Y4.67(SiO4)3O after corrosion test. It is also found that in CMAS corrosion test, the reaction zone formed between CMAS and Y2SiO5 layer prevents the mutual diffusion of elements in CMAS and Y2SiO5 layer. The apparent activation energy of reaction between CMAS and Y2SiO5 in 1200~1300℃ temperature ranges is calculated to be 713.749kJ/mol. These findings provide a reference to select appropriate materials for TEBC.

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