Preparation and Ablation Properties of Y2SiO5 Coating for SiC-Coated C/C Composites by Supersonic Plasma Spraying

Zhang, Jiaping; Fu, Qiangang; Zhuang, Lei; Li, Hejun; Sun, Changchun

doi:10.1007/s11666-015-0256-9

Cited by 14 publications

(3 citation statements)

References 19 publications

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“…According to Figure 1 Y 2 SiO 5 has an excellent water vapor resistance and is therefore considered as appropriate EBC material [34,35]. In this investigation only rather hot APS spraying conditions are investigated for this material.…”

Section: Development Of Aps Y 2 Sio 5 Coatingsmentioning

confidence: 99%

Environmental Barrier Coatings Made by Different Thermal Spray Technologies

et al. 2019

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Environmental barrier coatings (EBCs) are essential to protect ceramic matrix composites against water vapor recession in typical gas turbine environments. Both oxide and non-oxide-based ceramic matrix composites (CMCs) need such coatings as they show only a limited stability. As the thermal expansion coefficients are quite different between the two CMCs, the suitable EBC materials for both applications are different. In the paper examples of EBCs for both types of CMCs are presented. In case of EBCs for oxide-based CMCs, the limited strength of the CMC leads to damage of the surface if standard grit-blasting techniques are used. Only in the case of oxide-based CMCs different processes as laser ablation have been used to optimize the surface topography. Another result for many EBCs for oxide-based CMC is the possibility to deposit them by standard atmospheric plasma spraying (APS) as crystalline coatings. Hence, in case of these coatings only the APS process will be described. For the EBCs for non-oxide CMCs the state-of-the-art materials are rare earth or yttrium silicates. Here the major challenge is to obtain dense and crystalline coatings. While for the Y2SiO5 a promising microstructure could be obtained by a heat-treatment of an APS coating, this was not the case for Yb2Si2O7. Here also other thermal spray processes as high velocity oxygen fuel (HVOF), suspension plasma spraying (SPS), and very low-pressure plasma spraying (VLPPS) are used and the results described mainly with respect to crystallinity and porosity.

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Section: Development Of Aps Y 2 Sio 5 Coatingsmentioning

confidence: 99%

Environmental Barrier Coatings Made by Different Thermal Spray Technologies

et al. 2019

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“…It is a vital laser host crystal that has attracted wide attention. A number of published research studies have focused on its coating applications. − Webster et al found that Y 2 SiO 5 can be used as a substrate to deposit C/SiC to achieve the performance of oxidized protective coatings . Y 2 SiO 5 was considered to be one of the best host crystals owing to its high density, fast decay time, and excellent optical properties. − Sun et al reported the thermal performance of Y 2 SiO 5 .…”

Section: Introductionmentioning

confidence: 99%

Theoretical Determination of the Electronic Structures and Energy-Level Splitting for Pr³⁺-Doped Y₂SiO₅ Crystals

Ji,

Ju,

Yuan

et al. 2024

J. Phys. Chem. A

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Trivalent praseodymium (Pr3+)-doped yttrium silicate (Y2SiO5) crystals have been widely used in various phosphors owing to their excellent luminescence characteristics. Although a series of studies have been carried out on its application prospects, the electronic structures and energy-transfer mechanisms of Pr3+-doped Y2SiO5 (Y2SiO5:Pr) remain an exploratory topic. Herein, the crystal structure analysis by the particle swarm optimization structure search method is used to study the structural evolution of Y2SiO5:Pr. Two novel structures with local [PrO7]−11 and [PrO6]−9 [Y2SiO5:Pr (I) and Y2SiO5:Pr (II)] are successfully identified. The impurity Pr3+ ions occupy the Y3+ sites and successfully integrate into the Y2SiO5 host crystal with a Pr3+ concentration of 6.25%. The calculated electronic band structures show that the doping of Pr3+ induces a reduction in band gaps for the host Y2SiO5 crystal. The conduction bands near the Fermi level are completely composed of f states. For the atomic energies of Pr3+ in Y2SiO5, the Stark levels and transitions are properly simulated based on a new set of crystal field parameters (CFPs) at the C 1 site symmetry. A satisfactory r.m.s. dev. of 15.57 cm–1 with 9 free ion parameters (plus 27 fixed CFPs as obtained from ab initio calculation) fitted to the 33 observed levels is obtained for the first time. The plentiful energy-level transition lines, from the visible light to the near-infrared region, are deciphered for Pr3+ in Y2SiO5. Blue 3P0 → 3H4 at 465 nm is calculated to be a strong emission line, and it might be an ideal channel for laser actions. These results could not only provide important insights into the rare-earth-doped crystals but also lay the foundation for future research studies of designing the new laser materials.

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“…To prevent C/C composites from oxidation, metal silicide and silicon carbide are usually used as a basic coating to protect C/C composites against oxidation resulted from their inherent oxidation resistance and chemical compatibility with C/C composites. [9][10][11][12][13] The oxidation-resistant mechanism and failure of typical SiC coating have been studied systematically. [14][15][16] However, the oxidation tests of SiC coating are usually conducted in a constant temperature [17][18][19] which cannot entirely reflect the antioxidation ability of the coating, because the final returning process usually relates to an alternating temperature field and before that a cryogenic thermal cycling damage is already caused.…”

Section: Introductionmentioning

confidence: 99%

Effect of cryogenic thermal cycling on SiC-modified C/C composites

Zhang

Shi

Liu

2017

Surface Engineering

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The bonding strength, mechanical properties and high-temperature thermal shock resistance of C/C-SiC composites after undergoing simulated low earth orbit environment including cryogenic thermal cycles (CTCs) between 153 and 393 K for 200 times with high-vacuum state of 1.3 × 10 −3 Pa were investigated. Results of the tests showed that, the bonding strength at coating/substrate interface monotonically decreased as the CTCs increased. After 100 CTCs, the flexural strength of C/C-SiC composites enhanced and the percentage of remaining strength was 102.60%, while, the mass loss of specimens decreased from 2.08 to 0.89% after thermal shock resistance test between 1773 K and room temperature for 15 times. Once CTCs exceed 100 times, the mass loss increased, the flexural strength reduced and remained only 87.40% of initial strength after 200 CTCs. The fractural behaviour of CTCs-treated modified composites exhibited typical brittle mode. A model based on the evolution of the residual thermal stress after CTCs treatment was proposed to explain the oxidation failure mechanism of C/C-SiC specimens.

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Preparation and Ablation Properties of Y2SiO5 Coating for SiC-Coated C/C Composites by Supersonic Plasma Spraying

Cited by 14 publications

References 19 publications

Environmental Barrier Coatings Made by Different Thermal Spray Technologies

Environmental Barrier Coatings Made by Different Thermal Spray Technologies

Theoretical Determination of the Electronic Structures and Energy-Level Splitting for Pr³⁺-Doped Y₂SiO₅ Crystals

Effect of cryogenic thermal cycling on SiC-modified C/C composites

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Preparation and Ablation Properties of Y2SiO5 Coating for SiC-Coated C/C Composites by Supersonic Plasma Spraying

Cited by 14 publications

References 19 publications

Environmental Barrier Coatings Made by Different Thermal Spray Technologies

Environmental Barrier Coatings Made by Different Thermal Spray Technologies

Theoretical Determination of the Electronic Structures and Energy-Level Splitting for Pr3+-Doped Y2SiO5 Crystals

Effect of cryogenic thermal cycling on SiC-modified C/C composites

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Theoretical Determination of the Electronic Structures and Energy-Level Splitting for Pr³⁺-Doped Y₂SiO₅ Crystals