JOURNAL OF ALLOYS AND COMPOUNDS
·
2015
·
IF 2.999
Le Zhang,Yaozong Li,Xiaoyang Li,Hao Yang,Xuebin Qiao,Tianyuan Zhou,Zhongying Wang,Jian Zhang,Dingyuan Tang
Solid content of suspension for spray drying was systematically investigated to obtain spherical and dense Nd: granulated particles. The rheological behavior, morphology, size and distribution, apparent and tap densities, and transmittance measurements were used as tools to guide the selection of solid content of suspension. The balanced solid content were 42.0 wt.%. The granulated particles exhibited close to mono-dispersed, spherical and uniform dense aggregates, and mean size was ∼35 μm. Under 60 MPa pressure, the granules were completely crushed without obvious inter-granules void. The homogeneous element distribution and fine microstructure provided high optical quality of Nd:YAG ceramics and the transmittance at 1064 nm reached up to 84.90%.
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
·
2015
·
IF 2.947
Le Zhang,Hao Yang,Xuebin Qiao,Tianyuan Zhou,Zhongying Wang,Jian Zhang,Dingyuan Tang,Deyuan Shen,Qitu Zhang
Spray drying parameters have been systematically optimized to granulate a stoichiometric mixture of commercial oxides for YAG transparent ceramics. The processing parameters and suspension composition were changed in sequence and SEM analysis , EDS , MIP and transmittance measurements, were used to choose the best spray drying parameters. The optimized inlet and outlet temperatures of drying medium were 75 and 60 °C, and its flux and aspiration rate were 25 Hz and 30 Hz, respectively. The balanced suspension composition were: solid content 45 wt.%, binder PVB 1.0 wt.%, dispersant DS005 0.50 wt.% and the atomizer rotating speed 8000 r/min. The granulated particles exhibited excellent forming performance with mono-dispersed, spherical and fully dense aggregates, and mean size was ∼40 μm. They could be crushed under 40 MPa. The homogeneous distribution and microstructure of ceramics assured the high optical quality of YAG ceramics.
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 POLYMER ENGINEERING
·
2019
·Vol. 39
·期 10
·917-925
·
IF 1.072
Danbo Mao,Gang Lv,Guohan Gao,Bin Fan
Optical polyimide (PI) films were prepared by spin-coating from nearly non-volatile dimethylacetamide (DMAc) solutions. The uniformity of film thickness met the requirements of diffraction imaging quality. The results show that the final rotating speed ω , dynamic viscosity η , and initial polymer solid concentration c are the main factors affecting the film thickness T , and an empirical relationship which describes the film thickness as a function of the measured parameters was established to be T ∝ c 3.473 , η 0.586 , ω − 0.811 . Moreover, the viscosity dependence on concentration is system specific. Unlike traditional photoresist, the thickness uniformity of the PI film is determined by both spinning and precure process, which is intensively discussed in the present work. Uniform, 22-μm thick, PI films with transmitted wavefronts peak to valley (PV) ≤ 1/5 λ and root mean square (RMS) ≤ 1/50 λ were prepared under the optimum process: spin speed 900 rpm, initial fluid viscosity 10,500 cp, final spin time 120 s, precure temperature 70°C, spin process repeated 3 times. The results will find use in the production of optical quality membrane for ultra-lightweight optics or other applications.
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
·
2024
·
IF 5.1
Guannan Chen,Lv Zhu,Mingyuan Liu,Cong Wei,Chunming Zhou,Tianyuan Zhou,Cen Shao,Jian Kang,Wieslaw Strek,Hao Chen,Le Zhang
Transparent ceramic fiber is the appealing material for fiber laser gain media. Currently, the presence of micro-pore defects and poor optical quality in hundred-micron ceramic fibers greatly limits their application in fiber lasers. In this paper, high optical quality YAG (Y 3 Al 5 O 12 ) ceramic fibers were prepared by optimizing the ball milling time of slurry, and revealed that dispersion behavior of slurry was crucial to prepare good microstructure and defect-free green body and ceramic fibers. The excellent optical and mechanical properties of transparent ceramic fibers were obtained with the ball milling time of 25 h for slurry and sintering at 1780 °C for 8 h for ceramics. The transmittance of YAG ceramics (2 mm thick) at 800 nm of 82.6 % and a high flexural strength of 1124 ± 86 MPa could be observed. However, the longer ball milling time would thicken the slurry and deteriorate the uniformity slurry. This optimized processing technology of gelcasting could promote the quality of hundred-micron sized ceramics fibers.
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
OPTICAL MATERIALS
·
2017
·
IF 2.238
Zhengfa Dai,Qiang Liu,Dariusz Hreniak,Jiawei Dai,Wei Wang,Jiang Li
5 at%Yb:Sc 2 O 3 transparent ceramics were fabricated by the co-precipitation and vacuum sintering method. NH 4 HCO 3 and (NH 4 ) 2 SO 4 were used as precipitant and dispersing agent in the precipitation process, respectively. The influence of ammonium hydrogen carbonate to metal ions molar ratio (R value) on the morphology, agglomeration of resultant powders and the optical quality of transparent ceramics was investigated systematically. It was found that all the calcined powders synthesized with different R values exhibited same phase. The morphology of the precursors and calcined powders was investigated by FESEM, and the results show that the R value has a significant influence on the morphology of 5 at%Yb:Sc 2 O 3 precursors and calcined powders. The precursors and resultant powders exhibit a severe agglomeration with R = 4.4 and 4.8. Using these powders as starting materials, 5 at%Yb:Sc 2 O 3 transparent ceramics were successfully fabricated by vacuum sintering at 1850 °C for 10 h. There is only little difference in optical transmittances of 5 at%Yb:Sc 2 O 3 ceramics with R value within the 3.2–4.0 range. The ceramic sample with R = 4.0 possesses the best optical quality with the in-line transmittance of 71.9% at the wavelength of 1100 nm. The microstructures of the 5 at%Yb:Sc 2 O 3 transparent ceramics with different R values were also investigated.
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 ALLOYS AND COMPOUNDS
·
2019
·
IF 4.175
Sha Su,Qiang Liu,Zewang Hu,Xiaopu Chen,Hongming Pan,Xin Liu,Lexiang Wu,Jiang Li
Co-doped magnesium aluminate (Co:MgAl 2 O 4 ) transparent ceramics were obtained by pre-sintering in air and hot isostatic pressing (HIP) with commercial spinel and CoO powders as raw materials. The influences of the pre-sintering temperature on the microstructure and optical quality of the 0.05 at% Co:MgAl 2 O 4 ceramics were studied. It is found that the relative density of Co:MgAl 2 O 4 ceramics increases from 96.8% at 1500 °C to 98.7% at 1600 °C and then decreases with further increasing the pre-sintering temperature. The average grain size of Co:MgAl 2 O 4 ceramics increase from 4.6 μm to 19.2 μm with the increase of pre-sintering temperature from 1500 to 1700 °C. For the sample pre-sintered at 1600 °C for 5 h and HIP post-treated at 1800 °C for 3 h, the average grain size is about 23.0 μm and the near in-line transmittance reaches 75% at the wavelength range of 1700–2400 nm. The ground state absorption cross section at 1540 nm of the optimal 0.05 at% Co:MgAl 2 O 4 ceramics is calculated to be 2.9 × 10 −19 cm 2 .
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
·
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
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Haohao Ji,Mengmeng Xie,Yu Liu,Nianjiang Chen,Shiwei Wang,Dianzi Liu,Wenlan Gao,Haoran Wang,Yanhao Dong,Jian Zhang
The application of 3D printed transparent composite ceramics with designable gain profile in solid-state lasers has garnered increasing interest. Problems including the poor performance of slurries, defects generated in the green bodies during printing and the uncontrolled densification process between ceramics with different components have deteriorated the optical quality of transparent composite ceramics prepared by direct ink writing (DIW), leading to the limitations on the realization of high-power laser outputs. To solve this problem, a systematic investigation of Nd: YAG transparent composite ceramics was conducted throughout the fabrication process, including DIW with the capability of dual-material switching, vacuum sintering and hot isostatic pressing (HIP). First, the ceramic slurries with good printability and high solids loading were formulated by adjusting the dispersant and thickener contents. The sintering behaviors of undoped YAG and Nd: YAG ceramics were investigated to enhance the optical quality of transparent composite ceramics. The Nd ions diffusion distances of the interface between undoped YAG and Nd: YAG regions in the vertical and horizontal composite ceramics were tested and calculated to be 50.1 μm and 43.5 μm, respectively. Finally, the laser measurement of the YAG/0.3 at. % Nd: YAG/YAG transparent composite ceramic with the dimension of 3 × 3 × 4 mm 3 indicated that the maximum output power of 2.15 W with the slope efficiency of 40.2 % was achieved at the absorbed pump power of 5.70 W.
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
OPTICAL MATERIALS
·
2021
·
IF 3.08
Xing Zhang,Xinyou Huang,Ziyu Liu,Yagang Feng,Nan Jiang,Lexiang Wu,Zhaoxiang Yang,Tengfei Xie,Jiang Li
Ytterbium-doped yttrium oxide (5 at.%Yb:Y 2 O 3 ) nanopowders were synthesized by the co-precipitation method in this work. The influence of the molar ratio of ammonium hydrogen carbonate to metal ions (NH 4 HCO 3 /M 3+ , defined as R) on the properties of the precursors and powders was studied. The powders calcined at 1100 °C from the precursors with different R showed the same phase as the pure cubic Y 2 O 3 . However, the agglomerations of the calcined powders were influenced by the R evidently and the 5 at.%Yb:Y 2 O 3 powders with R = 4.0 showed better dispersivity. Using the obtained powders as starting materials, 5 at.%Yb:Y 2 O 3 transparent ceramics were fabricated by vacuum sintering and hot isostatic pressing (HIP) post-treating. The 5 at.%Yb:Y 2 O 3 ceramics with R = 4.0 possessed the best optical quality with the in-line transmittance of 81.2% at 1100 nm with fine grains. In addition, the microstructures of the 5 at.%Yb:Y 2 O 3 transparent ceramics with different R values were also studied and the HIP post-treated ceramics exhibited homogeneous microstructures. Meanwhile, the absorption and emission cross-sections of the 5 at.%Yb:Y 2 O 3 ceramics were calculated to be 0.99 × 10 −20 cm 2 at 976 nm and 0.97 × 10 −20 cm 2 at 1031 nm, respectively. The gain spectra also were obtained from the absorption and emission spectra.
研究领域:
材料科学
·
光学
·
陶瓷
✓ 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）