OPTICAL MATERIALS
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2020
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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
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光学工程
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
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2025
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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
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无机非金属材料
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光学材料
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
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2015
·
IF 2.605
Zhongying Wang,Le Zhang,Hao Yang,Jian Zhang,Lixi Wang,Qitu Zhang
High optical quality Y 2 O 3 transparent ceramics with fine grain size were successfully fabricated by air pre-sintering at various temperature ranging from 1500 to 1600 °C combined with a post-hot-isostatic pressing (HIP) treatment using co-precipitated powders as the starting material. The fully dense Y 2 O 3 transparent ceramic with highest transparency was obtained by pre-sintered at 1550 °C for 4 h in air and post-HIPed at 1600 °C for 3 h (the pressure of HIP 200 MPa), and it had fine microstructure and the average grain size was 0.96 μm. In addition, the in-line transmittance of the ceramic reached 81.7% at 1064 nm (1 mm thickness). By this approach, the transparent Y 2 O 3 ceramics with fine grain size (<1.6 μm) were elaborated without any sintering aid.
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
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2018
·
IF 3.794
He Zhang,Hao Wang,Honggang Gu,Xiao Zong,Bingtian Tu,Pengyu Xu,Bin Wang,Weimin Wang,Shiyuan Liu,Zhengyi Fu
Non-stoichiometric MgO·1.8Al 2 O 3 spinel transparent ceramic was prepared from synthesized single phase powder through an aqueous gel-casting forming technique. In order to prevent hydrolysis, the powder was specially treated in toluene with stearic acid and then dispersed in an aqueous solution with the help of amphoteric compound Tween 80 and dispersant TMAH. The surface modification process was confirmed by various techniques such as Fourier transmission infrared absorption spectroscopy (FT-IR), pH value, zeta potentials and rheological properties. Afterwards, gel-casted green compacts were debinded, pressureless-sintered (PS) and hot-isostatic-pressed (HIP). Highly transparent MgO·1.8Al 2 O 3 ceramics (3.6 mm in thickness) with in-line transmittance values of 77–82 % in visible region and higher than 85% in near infrared region were obtained. The samples exhibited Knoop hardness of 12.2 ± 0.2 GPa, Young’s modulus of 302 GPa, refractive index of 1.7046, and Abbe's number of 75.8.
研究领域:
材料科学
·
陶瓷
·
光学材料
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Fei Liu,Yuntao Huang,Jingjing Qu,Qingzhi Xu,Jianping Ma,Qihan Chen,Lifu Lin
Pyrochlore-type zirconates, particularly La 2 Zr 2 O 7 , are considered highly promising materials for high-temperature applications owing to their excellent thermal and mechanical properties. However, the fabrication of high-performance La 2 Zr 2 O 7 ceramics with complex geometries remains challenging. In this study, dense La 2 Zr 2 O 7 ceramics with complex structures were fabricated via digital light processing (DLP) vat photopolymerization. The entire process was systematically examined, from raw material powder pre-calcination, suspension formulation optimization (including the selection of surface modifier KH570 and dispersant KOS110), rheological and curing behavior control, to green body debinding and final sintering. The results indicated that the La 2 O 3 /ZrO 2 powders pre-calcined at 1100 °C significantly suppressed cracking during the debinding process. By using 1 wt% KH570 as a surface modifier and 2 wt% KOS110 as a dispersant, a ceramic suspension with 35 vol% solid loading, low viscosity, and good stability could be obtained. The La 2 Zr 2 O 7 ceramic sintered at 1600 °C for 6 h achieved a high relative density of 99.23 %, a flexural strength of 257 ± 27 MPa, and a thermal conductivity of 3.4 W/m·K. The XRD and Raman analyses confirmed the improved crystallinity with increasing sintering temperature, and the observed changes in peak intensity were attributed to the densification and microstructural evolution. Finally, the complex La 2 Zr 2 O 7 ceramic structures were successfully fabricated, demonstrating the high shaping precision and the compact, uniform microstructure. This study provides an experimental basis for manufacturing high-performance La 2 Zr 2 O 7 ceramics using DLP technology.
研究领域:
材料科学
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先进陶瓷
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增材制造
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无机非金属材料
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高温功能材料
✓ 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）