Effect of HfO2 content on CMAS corrosion resistance of a promising Hf6Ta2O17 ceramic for thermal barrier coatings

Liu, S.; Hu, X.P.; Liu, Q.; Guo, Jin Yun; Wu, Jing; Zhu, Wang

doi:10.1016/j.corsci.2022.110712

Cited by 14 publications

(4 citation statements)

References 46 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Recently, hafnium (Hf)which belongs to the same group as titanium and zirconiumhas been receiving increasing attention. Hafnium dioxide (HfO 2 ), the primary oxide of Hf, is commonly used in optical coatings, refractory materials, and catalysts. − At a nanoscale, HfO 2 displays improved properties, such as an enlarged surface area and increased catalytic activity. − In this study, a fluorine-containing organic ligand, tetrafluoroterephthalic acid, was used to synthesize the metal–organic framework (MOF) material UiO-66(Hf). This material was subsequently calcined to obtain HfO 2 .…”

Section: Introductionmentioning

confidence: 99%

Signal “On-Amplified-Off” Strategy Based on Hafnium Dioxide Nanomaterials as Electrochemiluminescence Emitters for Progesterone Detection

Dong,

Zeng,

Dai

et al. 2023

Anal. Chem.

View full text Add to dashboard Cite

When consumed, excess progesterone (P4)found in food and the environmentcan lead to severe illnesses in humans. Therefore, quantitative analysis of P4 is critical for identifying its hazardous levels. In this study, a novel signal “on-amplified-off” P4 detection mode was proposed, which was based on the utilization of hafnium oxide (HfO2) as a unique electrochemiluminescence (ECL) emitter, produced by calcining UiO-66(Hf). This is the first time that HfO2 has been used as an ECL emitter. HfO2 displayed excellent conductivity and a high specific surface area, allowing it to connect with numerous aptamers and produce a “signal-on” effect. Ni-doped ZnO (Ni-ZnO) acted as a coreaction accelerator, enhancing the ECL strength of HfO2 by generating more tripropylamine radicals. cDNA was labeled with Ni-ZnO, and Ni-ZnO was linked to the aptamer via base complementary pairing, affording “signal-amplified”. The presence of the target molecule P4 instigated a specific binding process with the aptamer, triggering the shedding of cDNA-Ni-ZnO and resulting in “signal-off”. This novel “on-amplified-off” strategy effectively improved the sensitivity and specificity of P4 analysis, introducing a practical method for detecting biomolecules beyond the scope of this study, which holds immense potential for future applications.

show abstract

Section: Introductionmentioning

confidence: 99%

Signal “On-Amplified-Off” Strategy Based on Hafnium Dioxide Nanomaterials as Electrochemiluminescence Emitters for Progesterone Detection

Dong,

Zeng,

Dai

et al. 2023

Anal. Chem.

View full text Add to dashboard Cite

show abstract

“…In addition, investigation revealed that an appropriate increased content of HfO 2 can improve the resistance of Hf 6 Ta 2 O 17 ceramics to CMAS corrosion. 31 The 33CaO-9MgO-13Al 2 O 3 -45SiO 2 , as a representative silicate melt, is commonly used to investigate the corrosion behavior of siliceous debris over TBCs. However, the chemical composition of the silicate particles changes with the geographical location of the aircraft, which can affect the melting point, viscosity, and corrosion behavior of the siliceous debris.…”

Section: Introductionmentioning

confidence: 99%

“…In addition, the entropy‐stabilized effect of the apatite phase improves the stability and density of the reaction layer, thus inhibiting the further CMAS corrosion. In addition, investigation revealed that an appropriate increased content of HfO 2 can improve the resistance of Hf 6 Ta 2 O 17 ceramics to CMAS corrosion 31 …”

Section: Introductionmentioning

confidence: 99%

Interaction and infiltration behavior between calcium–ferrum–alumina–silicate and Yb₄Hf₃O₁₂ ceramics at various temperatures

He,

Pan,

Zhou

et al. 2023

J Am Ceram Soc.

View full text Add to dashboard Cite

The interaction and infiltration behavior between typical calcium–ferrum–alumina–silicate (CFAS) and Yb4Hf3O12 ceramics at 1300, 1400, and 1500°C for different duration times were investigated. At 1300°C, the CFAS melt first crystallized and then generated massive anorthite with high‐melting point, reducing the wettability of CFAS melt and physically blocking CFAS penetration paths. As the temperature increased to 1400°C and 1500°C, the wettability of the molten CFAS correspondingly increases. A continuous reaction layer, composed of apatite, fluorite, and garnet, was formed over Yb4Hf3O12 ceramic due to the penetration of CFAS melt. Furthermore, the infiltration rate of CFAS decreases with increasing corrosion time because of the barrier effect primarily derived from the as‐mentioned continuous reaction layer.

show abstract

“…For example, Hf 6 Ta 2 O 17 showed good corrosion resistance as a coating for 33CaO-9MgO-13AlO 1.5 −45SiO 2 . 16,17 The same material has been also evaluated as possible high-k gate dielectrics for CMOS technology 18 and a sintering crucible in pyroprocessing. 6 Zr 6 Ta 2 O 17 /8 YSZ double-ceramic-layer displayed good thermal shock resistance.…”

mentioning

confidence: 99%

Charge Transport in the A₆B₂O₁₇ (A = Zr, Hf; B = Nb, Ta) Superstructure Series

Miruszewski,

Mielewczyk-Gryń,

Jaworski

et al. 2024

J. Electrochem. Soc.

View full text Add to dashboard Cite

The electrical properties of the entropy stabilized oxides: Zr6Nb2O17, Zr6Ta2O17, Hf6Nb2O17, and Hf6Ta2O17 were characterized. The results and the electrical properties of the products (i.e. ZrO2, HfO2, Nb2O5, and Ta2O5) led us to hypothesize the A6B2O17 family is a series of mixed ionic-electronic conductors. Conductivity measurements in varying oxygen partial pressure were performed on A6Nb2O17 and A6Ta2O17. The results indicate that electrons are involved in conduction in A6Nb2O17 while holes play a role in conduction of A6Ta2O17. Between 900-950°C, the charge transport in the A6B2O17 system increases in Ar atmosphere. A combination of DTA/DSC and in-situ high-temperature X-ray diffraction was performed to identify a potential mechanism for this increase. In-situ high-temperature X-ray diffraction in Ar does not show any phase transformation. Based on this, it is hypothesized that a change in the oxygen sub-lattice is the cause for the shift in high temperature conduction above 900-950°C. This could be (i) Nb(Ta)4+- oxygen vacancy associate formation/dissociation, (ii) formation of oxygen/oxygen vacancy complexes (iii) ordering/disordering of oxygen vacancies, and/or (iv) oxygen-based superstructure commensurate or incommensurate transitions. In-situ high-temperature neutron diffraction up to 1050°C is required to help elucidate the origins of this large increase in conductivity.

show abstract

Effect of HfO2 content on CMAS corrosion resistance of a promising Hf6Ta2O17 ceramic for thermal barrier coatings

Cited by 14 publications

References 46 publications

Signal “On-Amplified-Off” Strategy Based on Hafnium Dioxide Nanomaterials as Electrochemiluminescence Emitters for Progesterone Detection

Signal “On-Amplified-Off” Strategy Based on Hafnium Dioxide Nanomaterials as Electrochemiluminescence Emitters for Progesterone Detection

Interaction and infiltration behavior between calcium–ferrum–alumina–silicate and Yb₄Hf₃O₁₂ ceramics at various temperatures

Charge Transport in the A₆B₂O₁₇ (A = Zr, Hf; B = Nb, Ta) Superstructure Series

Contact Info

Product

Resources

About

Effect of HfO2 content on CMAS corrosion resistance of a promising Hf6Ta2O17 ceramic for thermal barrier coatings

Cited by 14 publications

References 46 publications

Signal “On-Amplified-Off” Strategy Based on Hafnium Dioxide Nanomaterials as Electrochemiluminescence Emitters for Progesterone Detection

Signal “On-Amplified-Off” Strategy Based on Hafnium Dioxide Nanomaterials as Electrochemiluminescence Emitters for Progesterone Detection

Interaction and infiltration behavior between calcium–ferrum–alumina–silicate and Yb4Hf3O12 ceramics at various temperatures

Charge Transport in the A6B2O17 (A = Zr, Hf; B = Nb, Ta) Superstructure Series

Contact Info

Product

Resources

About

Interaction and infiltration behavior between calcium–ferrum–alumina–silicate and Yb₄Hf₃O₁₂ ceramics at various temperatures

Charge Transport in the A₆B₂O₁₇ (A = Zr, Hf; B = Nb, Ta) Superstructure Series