Effect of Yb2SiO5 addition on the physical and mechanical properties of sintered mullite ceramic as an environmental barrier coating material

Feng, Fan; Jang, Byung Koog; Park, Ji Yeon; Lee, Kee Sung

doi:10.1016/j.ceramint.2016.06.149

Cited by 26 publications

(20 citation statements)

References 32 publications

(28 reference statements)

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“…By contrast, the load-displacement behavior of the mullite-based EBCs, which did not exhibit interfacial delamination even after 5000 thermal shock cycles, did not substantially differ from their initial indentation load-displacement behavior, as shown in Figure 10a,b. In the case of mullite, the residual displacement related to the hardness of the material was slightly increased after thermal shock, and the tangential slope of the stress-strain at unloading, which is related to the modulus of elasticity, decreased after thermal shock [10,25,26,31]. Thus, the hardness and elastic modulus of the sample decreased by 5000 thermal shock cycles.…”

Section: Resultsmentioning

confidence: 96%

“…To prevent the corrosion of Si-based ceramics at high temperatures, studies on the environmental barrier coatings (EBCs) have been extensively investigated [7][8][9][10][11][12][13]. The application of an oxide ceramic layer with a thickness of several tens to several hundreds of micrometers onto the silicon carbide surface can prevent high-temperature oxidation and corrosion by blocking the oxygen and steam penetration.…”

Section: Introductionmentioning

confidence: 99%

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Crack Healing in Mullite-Based EBC during Thermal Shock Cycle

2019

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Crack healing phenomena were observed in mullite and mullite + Yb 2 SiO 5 environmental barrier coating (EBC) materials during thermal shock cycles. Air plasma spray coating was used to deposit the EBC materials onto a Si bondcoat on a SiC f /SiC composite substrate. This study reveals that unidirectional vertical cracks (mud cracks) formed after several thermal shock cycles; however, the cracks were stable for 5000 thermal shock cycles at a maximum temperature of 1350 • C. Moreover, the crack densities decreased with an increasing number of thermal shock cycles. After 3000 thermal shock cycles, cracks were healed via melting of a phase containing SiO 2 phase, which partially filled the gaps of the cracks and resulted in the precipitation of crystalline Al 2 O 3 in the mullite. Post-indentation tests after thermal shock cycling indicated that the mullite-based EBC maintained its initial mechanical behavior compared to Y 2 SiO 5 . The indentation load-displacement tests revealed that, among the materials investigated in the present study, the mullite + Yb 2 SiO 5 EBC demonstrated the best durability during repetitive thermal shocks.

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Section: Resultsmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

Crack Healing in Mullite-Based EBC during Thermal Shock Cycle

2019

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“…Rare earth silicates (e.g., Yb, Er, Y, Lu) with good high temperature stability and good resistance to water vapor corrosion are considered to be the most potential EBC materials [11][12][13]. The thermal mismatch between Yb 2 SiO 5 and SiC CMC composites is effectively solved by the connection of Si antioxidant bond layer and 3Al 2 O 3 -2SiO 2 (Mullite) transition layer [14]. At present, tri-layer composite structure EBC is mainly prepared by atmospheric plasma spraying (APS), which is an efficient and low-cost preparation technology [15,16].…”

Section: Introductionmentioning

confidence: 99%

Water Vapor Corrosion Behavior of Yb2SiO5 Environmental Barrier Coatings Prepared by Plasma Spray-Physical Vapor Deposition

Wang

Liu

Feng³

et al. 2020

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Tri-layer Si/mullite/Yb2SiO5 environmental barrier coating (EBC) was prepared on the SiCf/SiC ceramic matrix composite (CMC) by plasma spray-physical vapor deposition (PS-PVD). The EBC samples were carried out with water vapor corrosion at 1300 °C for 200 h. After steam corrosion, Yb2SiO5 layer forms a gradient porous structure. This is mainly due to the inclusion of SiO2-rich layer which is precipitated from the gasification inside the coating and existing a small amount of Yb2O3 separately. During the corrosion process, water vapor infiltrates into the coating and reacts with the SiO2 and Yb2O3 to generate volatile substances. This forms a porous structure to make the coating brittle, resulting in mud cracks finally. In addition, the results show that the Yb2SiO5 can react with the water vapor at the coating surface, forming an Yb2Si2O7 top layer.

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“…A major drawback of SiC/SiC CMCs is the lack of environmental durability in combustion environments. The reaction of water vapor with silica scale grown on the composite would produce volatile silicon hydroxide, which tends to cause the rapid recession of SiC/SiC in high-pressure and high-velocity combustion environments [2][3][4]. Thus, environmental barrier coatings (EBCs) were developed to prevent environmental corrosion of SiC/SiC.…”

Section: Introductionmentioning

confidence: 99%

Mechanical Properties and Thermal Conductivity of Ytterbium-Silicate-Mullite Composites

et al. 2020

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Various Ytterbium-Silicate-Mullite composites were successfully fabricated by adding Yb2SiO5 into mullite ceramics and then using pressureless sintering at 1550 °C. The influence of Yb2SiO5 addition on the microstructure, mechanical properties, and thermal conductivity of ytterbium-silicate-mullite composites was investigated. Results show that the composites mainly consisted of a mullite matrix and some in situ formed Yb2Si2O7 and Al2O3 phases. By the addition of Yb2SiO5, the Vickers hardness of composites reached ~9.0 at an additive concentration of 5 mol %. Fracture toughness increased to ~2.7 MPa·m1/2 at the additive concentration of 15 mol %, owing to the trans-granular fracture and crack deflection of the pinning effect of the Al2O3 phase in the composites. With the increase of the Al2O3 phase in the composite, the thermal conductivity for the 15YbAM reached around 4.0 W/(m·K) at 1200 °C. Although the thermal conductivity increased, it is still acceptable for such composites to be used as environmental barrier coatings.

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Effect of Yb2SiO5 addition on the physical and mechanical properties of sintered mullite ceramic as an environmental barrier coating material

Cited by 26 publications

References 32 publications

Crack Healing in Mullite-Based EBC during Thermal Shock Cycle

Crack Healing in Mullite-Based EBC during Thermal Shock Cycle

Water Vapor Corrosion Behavior of Yb2SiO5 Environmental Barrier Coatings Prepared by Plasma Spray-Physical Vapor Deposition

Mechanical Properties and Thermal Conductivity of Ytterbium-Silicate-Mullite Composites

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