CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Shaobo Yang,Yujie Ma,Jiali Li,Sijie Kou,Bo Chen,Chidong Liu,Juanli Deng,Shangwu Fan
Nowadays, Y 2 O 3 –Al 2 O 3 –SiO 2 (YAS) glass joining is considered to be a promising scheme for nuclear-grade continuous silicon carbide (SiC) fiber reinforced SiC matrix composites (SiC/SiC). CaO has great potential for nuclear applications since it has low reactivity and low decay rate under nuclear irradiation. In this paper, the effect of CaO doping on the structure, thermophysical properties , and crystallization behavior of YAS glass was systematically studied. As the CaO doping content increased, the number of bridge oxygens and the viscosity at high temperatures reduced gradually. After heat treatment at 1400 °C, the main phases in YAS glass were β-Y 2 Si 2 O 7 , mullite , and SiO 2 (coexistence of crystalline and glass phases), while that with 3.0% CaO doping turned into a single glassy phase under the same treatment conditions. Moreover, a structural model and the modification mechanism were proposed, which provided a theoretical basis for the subsequent component design and optimization.
研究领域:
材料科学
·
核工程
·
陶瓷
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Fan Zhang,Dewei Ni,Bowen Chen,Feiyan Cai,Hongda Wang,Le Gao,Ping He,Yusheng Ding,Shaoming Dong
Ultrahigh temperature and long-term ablation-resistant properties are critical and challenging for the utilization of materials as the thermal components of hypersonic vehicles. In this work, Y 2 O 3 reinforced C f /HfB 2 -SiC composites are designed and fabricated, which present superior ablation resistance with a mass recession rate of 2.10 mg/s and linear recession rate of 0.67 μm/s (with 3 wt% Y 2 O 3 addition) under long term ablation at a heat flux of 5.5 MW/m 2 (up to ∼ 2700 °C) for 300 s. The long-term ablation mechanisms of the composites are studied and revealed with the help of a detailed microstructure analysis and thermodynamic considerations. It is indicated that Y 2 O 3 reacts with both HfO 2 and SiO 2 , leading to the formation of a stable oxide layer with small HfO 2 -based grains skeleton dispersed in HfO 2 -Y 2 O 3 -SiO 2 glassy phase, subsequently improving the ablation-resistant performance of the composites. This work inspires new strategies for further optimization of ablation resistance of ultra-high temperature ceramic matrix composites.
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
Additive Manufacturing
·
2022
·
IF 11.632
Meng Li,Hai-Lu Huang,Jia-Min Wu,Ya-Ru Wu,Zhang-Ao Shi,Jing-Xian Zhang,Yu-Sheng Shi
It is difficult to form Si 3 N 4 ceramics by DLP technology owing to the high refractive index and high ultraviolet (UV) absorption of Si 3 N 4 powder. In this paper, the Si 3 N 4 ceramics were successfully fabricated by DLP technology using Si 3 N 4 powder coated with Al 2 O 3 -Y 2 O 3 sintering additives. The effects of the coating amount of sintering additives on the properties of Si 3 N 4 ceramic slurry , green bodies and parts after sintering were systematically studied. When Al(NO 3 ) 3 and Y(NO 3 ) 3 solutions were added at a content of 20 mL/100 g Si 3 N 4 , the slurry with lowest viscosity (0.042 Pa·s at a shear rate of 30 s −1 ) and a higher monolayer curing depth (47.9 ± 1.2 µm) was obtained, the relative density and flexural strength of the Si 3 N 4 ceramics reached maximum values at 85.4% ± 0.3% and 149.2 ± 1.9 MPa. The shrinkage of the Si 3 N 4 ceramics remained almost unchanged after coating Al 2 O 3 -Y 2 O 3 sintering additives. Finally, the Si 3 N 4 ceramics with excellent quality and clear outline were well prepared. This research has laid a certain experimental basis for DLP forming Si 3 N 4 and other non-oxide ceramics, which is of great researching significance.
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
TRIBOLOGY INTERNATIONAL
·
2023
·
IF 6.2
Pengyu Lin,Junjie Song,Xin You,Qiuan Sun,Tao Li,Jiaxin Si,Haifeng Wang,Litian Hu,Yongsheng Zhang
ZrO 2 (Y 2 O 3 )-graphite composites with a three-dimensional (3D) continuous structure were prepared by using a core-shell design of graphite and ZrO 2 (Y 2 O 3 ). The effect of structure on the friction-reducing and anti-wear mechanisms from room temperature to 700 °C was investigated. During high-temperature friction, abrasive wear and brittle fracture are the main wear mechanisms for ZrO 2 (Y 2 O 3 )-graphite composites with homogeneous composition. For the composites with 3D structure, the continuous ZrO 2 matrix with high load-carrying capacity and the formation of a dense friction layer with self-lubricating and thermal oxidation resistance improve the tribological properties significantly, reducing the coefficient of friction by about 10% and the wear rate by nearly two orders of magnitude when coupled with GH4169 alloys at 600 °C.
研究领域:
材料科学
·
摩擦学
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 107
·105755-105760
·
IF 3.289
Xiaokai Li,Yangyang Xu,Xiaojian Mao,Qiangqiang Zhu,Minghui Feng,Benxue Jiang,Long Zhang
A modified vibrating screen method was employed to prepare granulated Y2O3 powders, which were used to fabricate transparent ceramics. The granulation process was carried out with yttrium-stabilized zirconia balls (5 mm in diameter) in a 200-mesh screen, which was vibrated by a Heidolph shaker. After passage through the vibrating screen, the sub-micron Y2O3 particles were converted into large granules and collected in the bottom chamber of the sieve. Compared with the original powders, the granulated powders had a smaller repose angle of 34.09° and larger apparent and tap densities with sharp rises of 50.54 and 32.07%, respectively, indicating a good flowability and filling properties. A high transmittance of 82% at 2500 nm was achieved for ceramics prepared using the granulated powders by vacuum sintering and hot isostatic pressing (HIP).
研究领域:
材料科学
·
无机非金属材料
·
陶瓷学
·
粉末冶金
·
光学材料
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2018
·
IF 3.057
Huilu Guo,Xiaojian Mao,Jian Zhang,Run Tian,Shiwei Wang
Attempts have been made to manufacture AlON transparent ceramics at low temperature using a new sintering aid system, Y 2 O 3 -La 2 O 3 -MnO. The sintering behaviors, including relative density and microstructure evolution of AlON ceramics doped with Y 2 O 3 -La 2 O 3 , MnO alone, and Y 2 O 3 -La 2 O 3 -MnO were compared. It was found that both the relative densities and grain sizes of samples doped with Y 2 O 3 -La 2 O 3 -MnO were much higher and larger than those of samples doped with Y 2 O 3 -La 2 O 3 or MnO alone, respectively. A liquid phase containing Al, O, N, Mn, and La formed at high temperature and played an important role on both eliminating pores and promoting grain growth of the sintered AlON bodies. Finally, translucent AlON ceramics were obtained through pressureless sintering at 1830 °C for 1 h, ~100 °C lower than those with conventional sintering aid Y 2 O 3 -La 2 O 3 . The ceramics doped with MnO showed green emission at 534 nm, under 445 nm excitation. We believe Y 2 O 3 -La 2 O 3 -MnO is a promising additive for the preparation of AlON transparent ceramic at lower temperature.
研究领域:
材料科学
·
陶瓷工程
·
光学材料
✓ 已验证
产品关联
DOI
高影响因子
Materials Today Communications
·
2025
·
IF 4.5
Hongming Gao,Fufa Wu,Pengfei Zhang,Xiaoyan Zhang,Xingbo Zhang,Hangda Xie,Guodong Sun,Mingyang Li
Y 2 O 3 dispersion-strengthened copper alloy prepared by mechanical alloying (MA) exhibits a high potential to be used as heat-sink materials in the fusion reactor. However, the feasibility of mass-production of the alloy by MA is still suspicious due to the low efficiency and the introduction of impurity elements. In this work, we prepared Y 2 O 3 dispersion-strengthened copper alloy by spray drying, a method suitable for large-scale production with almost no introduction of impurities. Microstructural investigations found that high-density Y 2 O 3 nanoparticles with the size of ∼9 nm are successfully introduced into the copper matrix by spray drying, which greatly refines the grain and inhibits the recrystallization behavior of the alloy. Moreover, most Y 2 O 3 nanoparticles share a coherent interface with the matrix, and as the Y 2 O 3 particles grow, the coherent interfaces transform into semi-coherent interfaces, with an orientation relationship of (11−1) Cu //(422) Y2O3 . The introduction of Y 2 O 3 nanoparticles greatly enhances the strength of the copper matrix by inhibiting the moving of the dislocations and grain boundaries, and a good combination of hardness (114 HV), strength (326.5 MPa), ductility (8.5 %) and electrical conductivity (85.3 %IACS) was achieved in the Cu-2Y 2 O 3 (wt%) alloy. This work proves the feasibility of introducing nano-scale Y 2 O 3 particles into the copper matrix by spray drying, however, the experimental parameters need to be carefully controlled to prevent agglomeration of Y 2 O 3 dispersoids. Large-scale production of ODS-Cu alloys for the fusion reactor may be realized through spray drying in the future.
研究领域:
材料科学
·
核能工程
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Pei Ren,Meiqi Han,Xingan Wang,Mu Zhang,Xudong Sun
Y 2 O 3 and CaO are ideal ceramic materials for precision casting of TiAl alloy, overcoming challenges associated with intricate component removal, such as turbine blades, leveraging the stability of Y 2 O 3 and the water solubility of CaO. To address these challenges, we employed Isobam104 in a novel gel casting method, serving as both a dispersant and a gelling agent. This method enabled us to create a stable Y 2 O 3 –CaCO 3 slurry with high solid content (up to 55 vol%) and low viscosity (101.51 mPa·s at a shear rate of 10 s −1 ). Following sintering at 1500 °C for 2 h, Y 2 O 3 –CaO composite ceramics were produced. Surprisingly, two distinct characteristics of CaO were noted. One showed a rod-shaped morphology with high chemical reactivity crucial for water solubility, while the other displayed a flat-like feature, forming a well-maintained interface due to its coherent or semi-coherent matching relationship with Y 2 O 3 , thereby providing excellent hydration resistance. Ultimately, we acquired composite ceramics showcasing a 30-day “shelf life" alongside exceptional water solubility. This establishes the theoretical groundwork for storing and employing soluble ceramic cores in the precision casting of TiAl alloy.
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
RSC Advances
·
2022
·Vol. 12
·期 21
·13261-13266
·
IF 4.036
Tao Li,Hongjun Kang,Songtao Lu,Wei Qin,Xiaohong Wu
As deep space exploration moves farther and farther away, thermal control coating of the in-orbit spacecraft will suffer a serious vacuum-ultraviolet radiation environment, which seriously threatens the reliability of the spacecraft in orbit. Therefore, it is important to improve the vacuum-ultraviolet resistance performance of the thermal control coating. In this work, the inorganic Al2O3–ZnO–Y2O3 thermal control coating was in situ fabricated on a 6061 aluminum alloy surface by PEO technology, and its vacuum-ultraviolet resistance performance was investigated. The results show that the Al2O3–ZnO–Y2O3 thermal control coating has a good resistance performance to vacuum-ultraviolet radiation, which is mainly because the large extinction coefficients of the ZnO and Y2O3 materials in the ultraviolet band are conducive to improving the ultraviolet resistance performance. Furthermore, the life prediction model of the Al2O3–ZnO–Y2O3 thermal control coating shows that its Δαs value first slightly increases and then tends to be stable with the increase of ultraviolet irradiation time from 0 ESH to 25 000 ESH, and the maximum variation of Δαs is about 0.0536. This work provides a material basis and technical support for the thermal control system of spacecraft with long life and high reliability.
研究领域:
材料科学
·
航天工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RUSSIAN JOURNAL OF INORGANIC CHEMISTRY
·
2019
·Vol. 64
·期 11
·1464-1468
·
IF 0.822
Kangkang Yuan,Jin Xiaotong,Wang Xinqiang,Zhang Guanghui,Zhu Luyi,Xu Dong
Abstract ZrO 2 ceramic fibers have gained widespread study for the high temperature stability, low thermal conductivity and high mechanical properties. While for oxide fibers, grain growth is one of the limiting factors for long-term high temperature applications. In the present study, polycrystalline ZrO 2 –6 mol % Y 2 O 3 ceramic fibers with the addition of ~0–5 mol % La 2 O 3 to refine the grain size were fabricated by the dry-spinning method. The XRD and Raman spectral results showed that the pyrochlore La 2 Zr 2 O 7 phase was formed as a second phase in the tetragonal zirconia fiber matrix. The formation of a second phase was an effective way to hinder grain growth for the competition phase effect and solid solution mechanism. With the addition of La 2 O 3 , the grain size decreased and concentrated in a smaller range of 50–250 nm compared with the ZrO 2 –6 mol % Y 2 O 3 matrix at 1400°C. Furthermore, the thermal conductivity of the fibers decreased with the additive of La 2 O 3 less than 3 mol %. The present system is a promising candidate for high temperature applications.
研究领域:
材料科学
·
陶瓷材料
·
高温材料
·
纤维材料
✓ 已验证
产品关联
DOI
高影响因子
Nanomaterials
·
2024
·Vol. 14
·期 8
·696
·
IF 4.4
Lingyu Liu,Fengchen Zhou,Yuxiang Zhang,Yanhua Sun,Shixing Zhang,Kun Cai,Ruichong Qiu,Yi Lin,Wenjun Fa,Zihua Wang
A new sol-gel method that employs cation exchange from an aqueous metal ion solution with H+ions of granulated alginic acid was developed for synthesizing high-purity Y2O3nanoparticles. In this study, the cation exchange kinetics of H+~Y3+in aqueous solution were analyzed using on-line pH technology and off-line inductively coupled plasma-atomic emission spectrometry (ICP-AES) analysis. Pseudo 2nd-order models were utilized to evaluate the parameters of the kinetics, suggesting that the concentration of H+~Y3+involved in the cation exchange reaction was 1:1.733. Further, a comprehensive understanding of the Y-ALG calcination process was developed using thermo-gravimetric analysis, along with results obtained from differential scanning calorimetry (TGA/DSC). A detailed analysis of the XRD Rietveld refinement plots revealed that the crystallite sizes of Y2O3nanoparticles were about 4 nm (500 °C) and 15 nm (800 °C), respectively. Differential pulse voltammetry (DPV) was employed to investigate the electrochemical oxidation of catechol. The oxidation peak currents of catechol at Y2O3(500 °C)/GCE and Y2O3(800 °C)/GCE showed two stages linear function of concentration (2.0~20.0 × 10−6mol/L, 20.0~60.0 × 10−6mol/L). The results indicated that the detection limits were equal to 2.4 × 10−7mol/L (Y2O3(500 °C)/GCE) and 7.8 × 10−7mol/L (Y2O3(800 °C)/GCE). The study not only provided a method to synthesize metal oxide, but also proposed a promising on-line pH model to study cation exchange kinetics.
研究领域:
材料科学
·
化学工程
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2013
·
IF 3.548
Ben Ma,Bo Chi,Jian Pu,Li Jian
NiO–Y 2 O 3 stabilized ZrO 2 (YSZ) composite is the state-of-the-art material for the anode support of planar solid oxide fuel cells (SOFCs). To improve its fracture toughness ( K C ), lanthanum orthoniobate LaNbO 4 is synthesized by the method of solid state reaction and added to the mixture of YSZ and NiO at the weight ratio of 47:53. The content of LaNbO 4 in the composite is in the range between 5 and 30 wt%. The microstructure of the composites is examined by scanning electron microscopy (SEM); and the chemical compatibility among the components is evaluated by X-ray diffraction (XRD) and energy dispersive X-ray spectroscopy (EDS). Vickers hardness test is performed for estimating the K C of the composites. The results indicate that the K C increases with the addition of LaNbO 4 in the composites; and the toughening effect is associated with the grain-refinement in the composite and the domain switch in the monoclinic LaNbO 4 .
研究领域:
材料科学
·
能源工程
✓ 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）