Magnetochemistry
·
2023
·Vol. 9
·期 2
·47
·
IF 2.7
Lixuan Zhang,Xiaoying Li,Dianjun Hu,Mariya Dobrotvorska,Roman Yavetskiy,Zhengfa Dai,Tengfei Xie,Qiang Yuan,Haohong Chen,Qiang Liu,Jiang Li
In recent years, transparent terbium aluminum garnet (TAG) ceramics have attracted much attention for use in high-power Faraday isolators. Fine-grained ceramics usually possess better mechanical properties and accordingly better service performance. In this work, transparent TAG ceramics with fine grains were prepared using a two-step sintering procedure based on the low-temperature sintering process to suppress grain growth. The composition of TAG precursor and powders calcined at different temperatures was studied in detail. The microstructure and relative density of air pre-sintered TAG ceramics were studied to meet the requirements of hot isostatic pressing (HIP) post-treatment. Driven by the low pre-sintering temperature in air, the average grain sizes of the obtained TAG ceramics after HIP treatment are about 2.9–5.3 μm. The TAG ceramics (1.2 mm thick) pre-sintered at 1450 °C with HIP post-treatment at 1550 °C for 3 h under a 176 MPa Ar atmosphere possess the highest in-line transmittance of 80.3% at 1064 nm. The Verdet constant of the TAG ceramics at 632.8 nm is −180.5 rad·T−1·m−1at room temperature, which is about 1.3 times larger than that of the commercial Tb3Ga5O12single crystals.
研究领域:
材料科学
·
光学材料
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Chi Zhang,Ning Wang,Hai Chang,Yingna Wu,Rui Yang,Dongxu Yao,Zirong Zhai
This study addresses challenges in manufacturing high-quality silicon nitride (Si 3 N 4 ) products using vat photopolymerization (VPP), a method that enables highly precise and complex manufacturing that was previously unachievable. A comparison of VPP and cold isostatic pressing (CIP) showed that the intergranular phases of VPP samples exhibited continuous network assembly, while the intergranular phases of CIP samples were dispersed and aggregated. For densification, VPP samples required more aggressive sintering conditions and a higher MgO content. This prolonged densification process adversely affected thermal conductivity, only reaching a maximum of 70.91 W m −1 ·K −1 . Through annealing, thermal conductivity of VPP sample improved by 72.44 %, narrowing the gap with CIP sample (90.28 W m −1 ·K −1 ) and reaching up to 96.20 W m −1 ·K −1 . Si 3 N 4 sample exhibiting high flexural strength of 908.28 ± 46.90 MPa were prepared using VPP. This study proposes a viable approach for producing high-performance Si 3 N 4 heat exchangers and other complex devices via VPP.
研究领域:
材料科学
·
制造工程
✓ 已验证
产品关联
DOI
高影响因子
OPTICAL MATERIALS
·
2019
·
IF 2.687
Xinyou Huang,Xing Zhang,Zewang Hu,Yagang Feng,Jiabei Wei,Xin Liu,Xiaoying Li,Haohong Chen,Lexiang Wu,Hongming Pan,Jiang Li
Yttrium (Y 2 O 3 ) nanopowders were synthesized via the precipitation method using ammonium hydrogen carbonate (AHC) as the precipitant. The influences of calcination temperature on the composition and morphology of the powders were investigated. Fine Y 2 O 3 powders with low-agglomeration were obtained by calcining the precursor at 1100 °C for 4 h. The primary crystallites were calculated to be ∼47 nm in size and weakly agglomerated to particles with size of ∼79 nm. Using the synthesized powders as the starting materials, Y 2 O 3 ceramics were fabricated by vacuum sintering at different temperatures combined with HIP post-treatment. The densification and micro-structure evolution of the Y 2 O 3 ceramics were systematically investigated. The ceramic sample vacuum sintered at 1500 °C for 2 h and post-HIPed at 1550 °C for 3 h exhibited a uniform and fine microstructure with the average grain of about 1.0 μm. The in-line transmittance of the ceramic sample reached 80.1% at 1100 nm.
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
·
2021
·
IF 5.302
Lixuan Zhang,Xiaoying Li,Dianjun Hu,Ziyu Liu,Tengfei Xie,Lexiang Wu,Zhaoxiang Yang,Jiang Li
Transparent Tb 2 Ti 2 O 7 magneto-optical ceramics were fabricated from co-precipitated nano-powders by vacuum pre-sintering with hot isostatic pressing (HIP) post-treatment. The formation of pyrochlore phase, decomposition of the precursor, and the morphology of powders calcined at different temperatures were investigated. The in-line transmittance of Tb 2 Ti 2 O 7 ceramics, which were pre-sintered at 1350 ℃ for 2 h with HIP post-treatment at 1450 ℃ for 3 h and subsequently annealed at 800 ℃ for 20 h in NH 3 atmosphere, reaches 65.5 % at 1064 nm. The Verdet constant of Tb 2 Ti 2 O 7 ceramics is −229.0 ± 0.6 rad·T −1 m −1 at the wavelength of 633 nm, which is 71 % higher than that of the commercial Tb 3 Ga 5 O 12 crystals. Tb 2 Ti 2 O 7 magneto-optical ceramics show a promising application for Faraday rotators.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
JOURNAL OF MOLECULAR STRUCTURE
·
2025
·
IF 4.7
Qingqing Yang,Chaosheng Yuan,Yongfu Liang,Xiang Zhu,Zheng Wang,Kai Shi,Xuerui Cheng,Lei Su
The phase transition of pyrrole was studied under static pressure and dynamic pressure by in situ Raman spectroscopy. Under static compression, pyrrole underwent three phase transitions: a liquid-to-crystal (phase Ⅰ) transition at 1.15 GPa, followed by transformation into phase II at 7.45 GPa and the start of amorphous phase transition at 16 GPa. Under dynamic compression, pyrrole was compressed into an amorphous phase as the pressure increased from 0.71 GPa to 5.02 GPa, 8.07 GPa, 10.30 GPa, 11.30 GPa and 12.84 GPa within 5 ms, respectively. Rapid compression rate and high pressure provide a greater degree of disorder in amorphous pyrrole by fitting the partial Raman peak linewidth with pressure. During the pressure relief process, the amorphous pyrrole crystallized and transformed into phase II at 3.20 GPa and then reverted to its initial liquid state at around 0.55 GPa. The phase behaviors can be attributed to different solidification mechanisms of liquid pyrrole induced by different compression rates under the two compression conditions.
研究领域:
凝聚态物理
·
材料科学
·
高压科学
·
光谱学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2016
·
IF 3.014
Le Zhang,Yue Ben,Hao Chen,Dingyuan Tang,Xianzhu Fu,Rong Sun,Bo Song,Chingping Wong
Highly transparent yttria ceramics were successfully fabricated by vacuum pre-sintering and post hot isostatic pressing (HIP) treatment both under very low temperatures synthesized from powders by a co-precipitated method. The morphologies and microstructures, density and thermal mechanical changes, and optical properties of ceramics under different processing stages were systematically characterized by (F)SEM, TMA, optical microscope and UV-Vis-IR spectrophotometer, respectively. The full densification of yttria ceramics could be achieved just at as low as 1450 °C for 4 h (vacuum pre-sintering) and 1400 °C for 3 h (post-HIP). The fabricated ceramics exhibited a uniform and fine microstructure and high optical performance. The average grain size was as small as 0.74 μm. The in-line transmittance reached 81.7% at 1100 nm (1 mm thickness). The transparent yttria ceramics were attractive without any sintering additives at such low pre-sintering and post-HIP temperatures.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS & DESIGN
·
2024
·
IF 7.6
Yunwei Shi,Jinghan Wang,Yichao Ren,Aiyang Wang,Qianglong He,Yanbo He,Hao Wang,Weimin Wang,Zhengyi Fu
The grain preferential orientation has a significant influence on the mechanical properties of silicon nitride (Si 3 N 4 ) ceramics. Based on the Jeffery’s theory, a grain rotation model under uniaxial compression is created to predict the texture evolution mechanism during sintering of Si 3 N 4 ceramics. With deformation, the grain orientation was predicted to rotate towards the plane perpendicular to the pressure direction, and large strain was favorable for the formation of strong texture. According to guidance of the model, the weakly textured microstructure prepared by normal hot pressing is attributed to the limited strain, due to the constrains of graphite die. Therefore, a new PHIP (pseudo-hot isostatic pressing) process with the large deformation is guided to fabricate the strongly textured ceramics by promoting the grain rotation and dynamic grain growth. Generally, the experimental results are well accordance with the model prediction. Furthermore, this model could be applied to guide the design and fabrication of other isotropic and anisotropic ceramic materials.
研究领域:
材料科学
·
陶瓷工程
✓ 已验证
DOI
高影响因子
OPTICAL MATERIALS
·
2020
·
IF 2.779
Feng Tian,Cong Chen,Yang Liu,Qiang Liu,Maxim Ivanov,Qingqing Wang,Nan Jiang,Haohong Chen,Zhaoxiang Yang,Tengfei Xie,Jiang Li
Using the nanopowders made by a reverse co-precipitation as raw materials, neodymium doped yttrium aluminum garnet (Nd:YAG) transparent ceramics were fabricated by vacuum pre-sintering with subsequent hot isostatic pressing (HIP) post-treatment. The green bodies were pre-sintered in vacuum at 1450 o C–1800 °C for 2 h and then HIPed at 1750 °C for 3 h under 200 MPa Ar atmosphere. Densification behavior and microstructure of the Nd:YAG ceramics before and after the HIP-treatment were investigated. Influences of the annealing temperature on transmittance and microstructure of the Nd:YAG ceramics were also studied. The ceramics pre-sintered at 1750 °C for 2 h and post-HIPed at 1750 °C for 3 h without any additional annealing in air were shown to have the best in-line transmittance of 79.1% at 1064 nm.
研究领域:
材料科学
·
光学工程
✓ 已验证
DOI
高影响因子
Additive Manufacturing
·
2024
·
IF 10.3
Shuaipeng Wang,Jintai Fan,Beining Li,Tao Feng,Xiaofeng Wang,Xiaobo Xiong,Jiangchun Li,Benxue Jiang,Long Zhang,Jin He,Fei Li
3D printing of transparent ceramics has attracted great attention recently but faces the challenges of limited compositional system and low transparency. Herein, transparent Y 2 O 3 -MgO nanocomposite ceramics with transmittance reaching 98.5 % of the theoretical limit are successfully fabricated using a materials extrusion-based 3D printing method assisted by hot isostatic pressing and the critical factors governing the superior printability and transparency are revealed. Various complex-shaped transparent nanocomposite ceramics are printed at a high resolution of 200 µm. The 3D printed transparent ceramics demonstrate fairly good infrared imaging ability, which significantly enhance its temperature resistant compared with classical infrared transparent sapphire ceramics. Compared with other 3D printed single phase transparent ceramics, the printed multi-phases transparent nanocomposite ceramics have the advantages of design complex microstructure for a targeted set of improved properties, including but not limited to mechanical properties, thermal stability, chemical resistance and optical properties , have great potential to be used in various advanced optical device under harsh environments.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Yanqiu Jing,Tingsong Li,Zhenzhen Zhou,Chen Hu,Maxim Ivanov,Dariusz Hreniak,Jiang Li
High quality and fine grained 4.5 at.% Sm:YAG transparent ceramics were fabricated by vacuum pre-sintering and hot isostatic pressing (HIP) from the co-precipitated nano-powders. After component optimization, the Sm 0.135 Y 2.865(1+x) Al 5 O 12 (x = 0.005) transparent ceramics have the highest in-line transmittance. Alumina secondary phase was observed in the Sm 0.135 Y 2.865(1+x) Al 5 O 12 (x = −0.001, 0) ceramics. The Sm 0.135 Y 2.865(1+x) Al 5 O 12 (x = 0.001, 0.003, 0.005, 0.007) ceramics showed clear microstructures because of the yttrium ions anti-site defects (Y 3+ in Al 3+ positions) forming. By optimizing the pre-sintering temperature to 1450 °C, the 4.5 at.% Sm:YAG transparent ceramics with the thickness of 2.0 mm achieved a high in-line transmittance of 84.1 % at 808 nm after HIP post-treatment at 1550 °C for 3 h. Fine grain size of 730 nm and appropriate absorption coefficient of 2.94 cm −1 at 1064 nm were also achieved. It is indicated that the 4.5 at.% Sm:YAG transparent ceramics could effectively suppress amplified spontaneous emission and parasitic oscillation as a cladding layer of the high power Nd:YAG ceramic lasers. The co-precipitation method for synthesizing 4.5 at.% Sm:YAG nano-powders were reported in detail, and fine-grained transparent ceramics were fabricated.
研究领域:
材料科学
·
无机非金属材料
·
光学材料
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2023
·
IF 5.7
Qianqian Zhao,Hao Wang,Bingtian Tu,Pengyu Xu,Zhengyang Jing,Weimin Wang,Zhengyi Fu
KNbTeO 6 transparent ceramics were prepared by combining pressure-less sintering and pseudo-hot isostatic pressing (PHIP) of the synthesized submicron single-phase powder. The PHIP was conducted by wrapping coarse magnesium aluminate powders around the pre-sintered body in the spark plasma sintering (SPS) furnace. With an average grain size of 412 ± 23 nm, the in-line transmittance of transparent KNbTeO 6 ceramics reaches 80.25% at 2677 nm. By contrast, the density of the samples prepared by conventional SPS with the same sintering procedure is only 98.73%, and the highest in-line transmittance 64.25% occurs at 4976 nm. In particular, by investigating the sintering mechanism of PHIP, the improvement of microstructure and optical transmittance could be attributed to the plastic deformation caused by shear stress. The obtained ceramics exhibited excellent mechanical and dielectric properties , which was benefited from the novel sintering technology.
研究领域:
材料科学
·
光学材料
✓ 已验证
DOI
高影响因子
OPTICAL MATERIALS
·
2017
·
IF 2.238
Jiawei Dai,Yubai Pan,Wei Wang,Wei Luo,Tengfei Xie,Huamin Kou,Jiang Li
Terbium aluminum garnet (TAG) precursor was synthesized by a co-precipitation method from a mixed solution of terbium and aluminum nitrates using ammonium hydrogen carbonate (AHC) as the precipitant. The powders calcined at different temperatures were investigated by XRD , FTIR and FESEM in order to choose the optimal calcination temperature. Fine and low-agglomerated TAG powders with average particle size of 88 nm were obtained by calcining the precursor at 1100 °C for 4 h. Using this powder as starting material, TAG transparent ceramics were fabricated by vacuum sintering combined with hot isostatic pressing (HIP) sintering. For the sample pre-sintered at 1700 °C for 20 h with HIP post-treated at 1700 °C for 3 h, the average grain size is about 3.9 μm and the in-line transmittance is beyond 55% in the region of 500–1600 nm, reaching a maximum transmittance of 64.2% at the wavelength of 1450 nm. The Verdet constant at 633 nm is measured to be −178.9 rad T −1 m −1 , which is 33% larger than that of the commercial TGG single crystal (−134 rad T −1 m −1 ).
研究领域:
材料科学
·
光学工程
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）