JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2024
·
IF 3.5
Shuang Mu,Qin Ma,Yu Zhang,Xu Shen,Chunjing Liao,Xiangyu Zhang,Yusheng Ding,Shaoming Dong,Jinshan Yang
In this work, the Yb 2 Si 2 O 7 interphase was prepared on SiC fibers using the sol–gel method. The influence of sol concentration on the morphology of the interphase was discussed. After heat treatment in argon at 1200°C for 1 h, the Yb 2 Si 2 O 7 was grown in situ on the fiber surface, forming an interphase layer. Then, SiC f /Yb 2 Si 2 O 7 /SiC minicomposites were prepared by chemical vapor infiltration (CVI). The Yb 2 Si 2 O 7 interphase exhibited no changes throughout the high-temperature preparation process and maintained stability and compatibility with the fiber and matrix. The tensile strength of SiC f /Yb 2 Si 2 O 7 /SiC minicomposites with Yb 2 Si 2 O 7 interphase was significantly higher than SiC f /SiC minicomposites without interphase. The crack deflection, interfacial debonding, and fiber pullout were observed in the tensile fracture of the SiC f /Yb 2 Si 2 O 7 /SiC minicomposites.
研究领域:
材料科学
·
机械工程
✓ 已验证
DOI
高影响因子
International Journal of Applied Ceramic Technology
·
2023
·Vol. 20
·期 3
·1740-1752
·
IF 2.1
Ling Pan,Pengju Chen,Peng Xiao,Ling He,Wei Zhou,Yang Li
The mullite and ytterbium disilicate (β-Yb 2 Si 2 O 7 ) powders as starting materials for the Yb 2 Si 2 O 7 /mullite/SiC tri-layer coating are synthesized by a sol–gel method. The effect of SiC whiskers on the anti-oxidation properties of Yb 2 Si 2 O 7 /mullite/SiC tri-layer coating for C/SiC composites in the air environment is deeply studied. Results show that the formation temperature and complete transition temperature of mullite were 800–1000 and 1300°C, respectively. Yb 2 SiO 5 , α-Yb 2 Si 2 O 7 , and β-Yb 2 Si 2 O 7 were gradually formed between 800 and 1000°C, and Yb 2 SiO 5 and α-Yb 2 Si 2 O 7 were completely transformed into β-Yb 2 Si 2 O 7 at a temperature above 1200°C. The weight loss of Yb 2 Si 2 O 7 /(SiC w –mullite)/SiC tri-layer coating coated specimens was 0.15 × 10 −3 g cm −2 after 200 h oxidation at 1400°C, which is lower than that of Yb 2 Si 2 O 7 /mullite/SiC tri-layer coating (2.84 × 10 −3 g cm −2 ). The SiC whiskers in mullite middle coating can not only alleviate the coefficient of thermal expansion difference between mullite middle coating and β-Yb 2 Si 2 O 7 outer coating, but also improve the self-healing performance of the mullite middle coating owing to the self-healing aluminosilicate glass phase formed by the reaction between SiO 2 (oxidation of SiC whiskers) and mullite particles.
研究领域:
材料科学
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陶瓷学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Jintao Wang,Du Hong,Xin Zhong,Liping Huang,Yaran Niu,Hong Li,Xuebin Zheng,Jinliang Sun
The abradable sealing coatings (ASCs) matched with ceramic matrix composites (CMCs) can improve engine efficiency and reduce fuel consumption. A study of plasma-sprayed porous Yb 2 Si 2 O 7 -20 vol% CaF 2 with various contents of poly-p-hydroxybenzoate (PHB) as ASCs compatible with CMCs is reported. The microstructure and phase composition, Rockwell hardness, wear behaviors and abradability of the coatings were comparatively studied. The results show that the porosity increased and the hardness decreased as the PHB content was increased, and the coating containing 20 vol% PHB had a minimum hardness of about 65.2 HR45Y and a maximum porosity of about 39.2%. The friction coefficients and IDR values decreased, wear depth and volume wear rates of the coatings effectively improved with the increase of porosity. The wear mechanisms were analyzed based on the observation of the worn surfaces. This work might provide some guidance for the design and application of ASCs for CMCs.
研究领域:
材料科学
·
航空航天工程
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Lu Tang,Siyu Chen,Ying Li,Donghong Wang,Zhiyong Chen,Yi Zuo,Sifan Zong,Jimei Xue,Zhijun Wang,Hanjun Wei
Due to the poor electromagnetic (EM) wave attenuation capability and relatively large bandgap of rare-earth silicate materials, their application as EM wave attenuation materials is adversely affected. In this work, TiO 2 was deposited onto the surface of porous Yb 2 Si 2 O 7 using a precipitation process followed by calcination. A transition from TiO 2 nanorods to nanowires resulted in a flower-like three-dimensional (3D) network structure, effectively modulating the dielectric and EM wave-absorbing properties. The TiO 2 /Yb 2 Si 2 O 7 ceramic (YT-3 sample) with a TiO 2 nanowire content of 20.1 wt% achieved a minimum reflection loss (RL min ) of −21.1 dB at 2.3 mm and an effective absorption bandwidth (EAB) of 2.6 GHz at a thickness of 2.5 mm. Furthermore, the EAB fully covered the X-band at thickness ranging from 2.0 to 4.10 mm. The radar cross-section of the YT-3 sample significantly decreased by 21.5 dBm 2 . This improvement likely attributed to the 3D porous structure formed by the TiO 2 nanowires, which improved the impedance matching and electrical conductivity while increasing both homogeneous interfaces and heterointerfaces. This enhancement facilitated electron transfer and hopping, amplified polarization and conduction losses and promoted multiple EM wave reflections and scattering. Additionally, the weight variation of the YT-3 sample was <0.48 % in the range of 25–1400 °C, demonstrating excellent high-temperature stability. These results advances to the development of Yb 2 Si 2 O 7 -based wave-absorbing materials for achieving effective EM wave absorption in high-temperature environments.
研究领域:
材料科学
·
电磁学
·
高温材料
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2023
·
IF 5.7
Liang Zhou,Jianbao Hu,Yunhui Zhang,Min Tan,Chunjing Liao,Han Luo,Yanmei Kan,Xiangyu Zhang,Jinshan Yang,Xiaowu Chen,Shaoming Dong
The phase transition of thermally grown oxide (TGO) has been proven to be an important factor affecting the durability of EBCs. Yb 2 O 3 and Yb 2 SiO 5 can react with silica to form silicate, which can reduce the TGO thickness and extend the lifetime of EBCs. In this paper, the Yb 2 SiO 5 -Yb 2 O 3 -Si-SiC ceramic was prepared by tape casting combined with silicon reactive melt infiltration. The oxidation properties of the ceramic were evaluated at 1200–1400 °C. With the increase in temperature, the content of SiO 2 in the oxide layer decreased and the content of Yb 2 Si 2 O 7 increased. A dense and continuous Yb 2 Si 2 O 7 layer was formed at 1400 °C. Yb 2 Si 2 O 7 is formed at the edge of Yb 2 SiO 5 , then Yb 3+ diffuses outwards, Si 4+ diffuses inwards and gradually forms Yb 2 Si 2 O 7 from the outside to the inside.
研究领域:
材料科学
·
陶瓷工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2026
·
IF 6.3
Tianyuan Jiang,Xu Shen,Yu Zhang,Feiyan Cai,Li Tian,Jinshan Yang,Shaoming Dong
In this work, continuous and dense Yb 2 Si 2 O 7 coating was formed on the surface of SiC fibers by reaction of the Yb 2 O 3 coatings prepared via urea-based homogeneous precipitation with SiO 2 scales formed by fiber oxidation. The effect of SiO 2 to Yb 2 O 3 thickness ratio on the microstructure and morphology of Yb 2 Si 2 O 7 coatings was investigated. Fiber oxidation and defects introduced during coating synthesis cause severe fiber degradation, and pre-deposition of SiC via chemical vapor infiltration can improve the strength retention of the fibers. The Yb 2 Si 2 O 7 coatings can protect fibers from corrosion in water vapor environment at 1200 ℃, showing great resistance to oxidation.
✓ 已验证
DOI
高影响因子
International Journal of Applied Ceramic Technology
·
2024
·
IF 1.8
Pengju Chen,Peng Xiao,Tian Tian,Yang Li
Ytterbium silicate (Yb 2 Si 2 O 7 ) and lanthanum zirconate (La 2 Zr 2 O 7 ) ceramic powders were synthesized by the sol–gel method. A novel tri-layer La 2 Zr 2 O 7 /Yb 2 Si 2 O 7 /SiC environmental barrier coating was prepared on the surface of C/SiC composites to improve the service temperature of the coating (above the Si melting point, 1683 K). Results show that both Yb 2 Si 2 O 7 and La 2 Zr 2 O 7 ceramic powders had extremely high purity and were accompanied by a large number of nanoparticles. The tri-layer La 2 Zr 2 O 7 /Yb 2 Si 2 O 7 /SiC coating can efficiently prevent the oxidation failure of C/SiC composites in 1773 K air environment for more than 100 h with slight weight loss of 5.71 × 10 −3 g·cm −2 and the matching weight loss rate of 5.71 × 10 −5 g·cm −2 ·h −1 . No significant chemical reaction was observed between Yb 2 Si 2 O 7 middle and La 2 Zr 2 O 7 outer coatings during the oxidation process at 1773 K, indicating that the tri-layer La 2 Zr 2 O 7 /Yb 2 Si 2 O 7 /SiC coating had better oxidation stability in 1773 K air environment.
研究领域:
材料科学
·
涂层技术
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）