OPTICAL MATERIALS
·
2016
·
IF 2.183
Lin Ge,Jiang Li,Haiyun Qu,Juntao Wang,Jiao Liu,Jiawei Dai,Zhiwei Zhou,Binglong Liu,Huamin Kou,Yun Shi,Zheng Wang,Yubai Pan,Qingsong Gao,Jingkun Guo
The sintering behavior and doping concentration profile of the planar waveguide YAG/Nd:YAG/YAG ceramics by the tape casting and solid-state reaction method were investigated on the basis of densification trajectory, microstructure evolution, and Nd 3+ ions diffusion . The porosity of the green body by tape casting and cold isostatic pressing is about 38.6%. And the green bodies were consolidated from 1100 °C to 1800 °C for 0.5–20 h to study the densification and the doping diffusion behaviors. At the temperature higher than 1500 °C, pure YAG phase is formed, followed by the densification and grain growth process. With the increase of temperature, two sintering stages occur, corresponding to remarkable densification and significant grain growth, respectively. The mechanism controlling densification at 1550 °C is grain boundary diffusion. The diffusion of Nd 3+ ions is more sensitive to temperature than the sintering time, and the minimum temperature required for the obvious diffusion of Nd 3+ ions is higher than 1700 °C. Finally, planar waveguide YAG/1.5 at.%Nd:YAG/YAG transparent ceramics with in-line transmittance of 84.8% at 1064 nm were obtained by vacuum-sintering at 1780 °C for 30 h. The fluorescence lifetime of 4 F 3/2 state of Nd 3+ in the specimen is about 259 μs. The prepared ceramic waveguide was tested in a laser amplifier and the laser pulse was amplificated from 87 mJ to 238 mJ, with the pump energy of 680 mJ.
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 ELECTRONIC MATERIALS
·
2018
·Vol. 48
·期 1
·374-385
·
IF 1.566
Tong Huanzhe,Wang Nengli,Zou Yuqi,Zhang Zhaoquan,Fan Wugang,Shou Jinxiang,Zhang Xiyan
Yttrium aluminum garnet (Y 3 Al 5 O 12 , YAG) ceramics with a relative density of about 99.5% were fabricated by solid-state reaction and pressureless sintering using commercial α-Al 2 O 3 and Y 2 O 3 powders as raw materials in air. The effect of different sintering additives, e.g. tetraethyl orthosilicate (TEOS), MgO and TEOS + MgO, on the relative density and mechanical properties of the YAG ceramic samples were investigated. When the dopant content of TEOS exceeded 0.5 wt.%, a sudden grain growth appeared, as well as a residual second phase located in triangle grain boundary. MgO was more effective as a sintering additive than silica in promoting the densification of the YAG ceramics. The relative density of the ceramics gradually decreased with the increase of MgO doping content and fixed TEOS content. The mechanical properties of the YAG ceramics fabricated by pressureless sintering in air at 1600–1710°C were tested. The fracture surface morphology of the MgO-doped ceramic samples was mainly transgranular, whereas the TEOS-doped samples were mainly intergranular.
研究领域:
材料科学
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陶瓷工程
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2015
·
IF 2.605
Xiaorong Zhang,Xiaochuan Wang,Ping Fu,Wenzhong Lu
YAG ceramics with good dielectric properties were prepared via a modified pyrolysis method, with yttrium nitrate as the yttrium source and combined aluminium sulphate and aluminium nitrate as aluminium sources, and subsequent sintering in a muffle furnace. The effects of the different aluminium sources on the powder characteristic and the impact of sintering temperature , sintering aids (TEOS) and additive (TiO 2 ) on the dielectric properties of the ceramics were studied. The results show that well-dispersed pure YAG nano-powders can be obtained after calcination at 1000 °C with an aluminium sulphate and aluminium nitrate molar ratio of 1.5:2. The relative density, permittivity ( ε r ) and quality factor ( Q × f ) of the YAG ceramics increase with sintering temperature and TEOS addition. TiO 2 can greatly promote τ f to near-zero but decreases Q × f . The relative density, ε r , Q × f and τ f of the YAG–1 wt% TEOS–1 wt% TiO 2 ceramic obtained at 1520 °C are 97.6%, 9.9, 71, 738 GHz and −30 ppm/°C, respectively.
研究领域:
材料科学
·
陶瓷工程
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2019
·
IF 3.45
Pan Gao,Le Zhang,Qing Yao,Cen Shao,Shuai Wei,Tianyuan Zhou,Hao Chen,Hao Yang
Aqueous gelcasting has been applied to form multiple advanced ceramics with large size or complex shape. However, the optical performance of transparent ceramics fabricated by gelcasting is not satisfactory due to the microstructure defects and residual organics. YAG ceramics with excellent optical transmittance were prepared through improving solid content of suspension, obtaining fine microstructure of fully dense ceramics without residual organics in this paper. The effects of ammonium citrate tribasic (TAC) and solid content on the rheological performance of suspension as well as the effect of solid content on the microstructure of green body were systematically investigated. The viscosity of suspension with 43 vol% solid content and 0.25 wt% TAC was as low as 0.03 Pa s at 100 s −1 . The YAG ceramics (thickness 2.5 mm) with high optical transmittance (T = 83.2% at 1064 nm) were prepared from 43 vol% after vacuum sintering at 1780 °C for 8 h. The green body cast from 45 vol% solid content had an excellent bending strength about 29 MPa, and the residual pores were eliminated after vacuum sintering, while the residual organics was detected by optical microscopy and elemental analyzer inside YAG ceramics. The residual organics results in the decrease of in-line transmittance of YAG ceramic cast from 45 vol% solid content than that of ceramic cast from 43 vol%. This study suggests a promising prospect for AM gelling system in the cost-efficient manufacturing of highly transparent ceramics with high bending strength of green bodies.
研究领域:
材料科学
·
光学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF LUMINESCENCE
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2019
·
IF 2.961
Yang Liu,Mingfu Zhang,Lijun Xu,Wei Xia
Transparent Ce 3+ :YAG ceramics have great potentials in WLEDs due to their ultra-high thermal endurance property and thermal stability of luminescence. However, it is still a challenging issue to enhance their light extraction ability. In the study, the transparent Ce 3+ :YAG ceramics were fabricated using the uniform Ce:Y 2 O 3 submicron spheres by a solid-state reactive sintering method under vacuum without any sintering additives. The content of the residual pores and grain boundaries, which acted as the “light-scattering centres” to improve the absorption of blue light, were adjusted by changing sintering temperature . The luminous efficacy of the WLED with the sample sintered at 1700 °C was as high as 104.6 lm/W, due to the appropriate quantity of the “light-scattering centres”. The microstructures, transmittance , excitation and emission spectra , luminous characteristics of the samples were studied. The results showed that the preparation progress could significantly enhance the luminous efficacy in the WLED with transparent ceramics.
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
Yu Zhao,Qiang Liu,Lin Ge,Chao Wang,Wenxue Li,Chao Yang,Juntao Wang,Lei Yuan,Tengfei Xie,Huamin Kou,Yubai Pan,Qingsong Gao,Yong Bo,Qinjun Peng,Zuyan Xu,Jiang Li
Highly transparent YAG/10at.%Yb:YAG/YAG planar waveguide ceramics were fabricated by the non-aqueous tape casting and solid-state reactive sintering technology. The tapes are relatively homogeneous and the green body shows a dense structure without distinct interfaces after the treatment of debinding and cold isostatic pressing . YAG/10at.%Yb:YAG/YAG ceramics with almost full dense structure were obtained by vacuum-sintering at 1760 °C for 30 h. For the mirror-polished sample with the thickness of 3.5 mm, the In-line transmittance was measured to be 83.6% at the visual wavelength of 400 nm. The diffusion distance of the Yb 3+ ions was about 215 μm along the thickness direction of the ceramics. In the lasing experiments, the YAG/10at.%Yb:YAG/YAG planar waveguide ceramics were end-pumped by a 976 nm semiconductor diode laser and enabled efficient continuous-wave lasers, which resulted in a maximum output power of 1.6 W and a slope efficiency of 34.4% at 1030 nm.
研究领域:
材料科学
·
光学工程
✓ 已验证
DOI
高影响因子
Materials Research Express
·
2019
·Vol. 6
·期 10
·105099
·
IF 1.449
Cao Wang,Ming Li,Zhe Zhao
Commercial α-Al2O3 and Y2O3 powders with 0.5 wt% TEOS were used to fabricate transparent polycrystalline YAG ceramics by reactive spark plasma sintering. The powder mixtures were dispersed with dispersants of PAA and citric acid in aqueous slurry. YAG specimens sintered at 1400 °C for 3 min were used to investigate the effect of processing parameters on the microstructure and the optical properties. It is found that a pretreatment of the powders mixture with 0.6 wt% citric acid can significantly improve the microstructure homogeneity of the as-sintered YAG ceramics. After post-annealing in wet air, the specimen sintered from the treated powders mixture was transparent, while the specimen from the untreated powders mixture was hazy. The effects of citric acid for this were investigated in this paper.
研究领域:
材料科学
·
光学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2023
·
IF 5.7
Lv Zhu,Le Zhang,Mingyuan Liu,Guannan Chen,Yifei Cao,Cong Wei,Chunming Zhou,Bingheng Sun,Cen Shao,Jian Kang,Hao Chen,Hao Yang
YAG ceramic fiber is the preferred material for the gain medium of the new generation fiber laser. However, the fabrication of hundred-micron and defect-free YAG ceramic fibers is still the primary challenge. In this paper, YAG ceramic fibers with the diameter of 147 µm and length of 113 mm were successfully batch fabricated by the combination of gelcasting and mold design , and the diameter fluctuation rate was only 1.4%. The solid loading of the slurries (46–54 vol%) were systematically investigated to achieve high density and net-shape forming of green fibers. It was found that the YAG ceramic fiber was highly transparent with the optimized solid loading of 52 vol%, and the transmittance of the YAG ceramic (2 mm thick) at 800 nm was 82.6%. Its bending strength was as high as 1124 ± 86 MPa. The ideas and methods of this study will promote the development of gelcasting in the field of hundred-micron ceramic 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
危险品化学品经营许可证（带存储）