Ammonium citrate assisted surface modification and gel casting of YAG transparent ceramics

Zhang, Le; Yao, Qing; Yuan, Zitian; Jiang, Zhigang; Gu, Lingcheng; Sun, Bingheng; Shao, Cen; Zhou, Tianyuan; Bu, Wei; Wang, Yun; Chen, Hao

doi:10.1016/j.ceramint.2018.08.304

Cited by 21 publications

(5 citation statements)

References 35 publications

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“…It should be noted that the transparency of the ceramics depends on the concentration of residual pores which act as light scattering centers. The light transmittance of pore-free YAG : Ce optical ceramics may be as high as 80% and can achieve values comparable with those of single crystals having the same compositions [16,[19][20][21].…”

Section: Resultsmentioning

confidence: 99%

Effect of vacuum sintering conditions on the properties of Y3Al5O12 : Ce luminescent ceramics

Tarala¹,

Кравцов²,

Chapura³

et al. 2022

MoEM

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The aim of this work was to study the effect of vacuum sintering conditions and cerium concentration on the optical, luminescent and thermal properties of yttrium-aluminum garnet based ceramics doped with Се3+ cations. Series of ceramic powders were synthesized and samples of luminescent ceramics having the composition Y3-хСехAl5O12 were synthesized where x was in the range 0.01 to 0.025 f.u. We show that the phase composition and grain size distribution of the ceramic powders do not depend on cerium concentration. Without sintering additives, an increase in vacuum sintering temperature from 1675 to 1800 °C leads to an increase in the optical transmittance of luminescent ceramic specimens from 5 to 55% at a 540 nm wavelength and an increase in the thermal conductivity of the samples from 8.4 to 9.5 W/(m ∙ K). It was found that an increase in cerium concentration leads to a shift of the luminescent band peak from 535 to 545 nm where as the width of the luminescent band decreases with an increase in vacuum sintering temperature from 1675 to 1725 °C.

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Section: Resultsmentioning

confidence: 99%

Effect of vacuum sintering conditions on the properties of Y3Al5O12 : Ce luminescent ceramics

Tarala¹,

Кравцов²,

Chapura³

et al. 2022

MoEM

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“…As seen from Figure 5c,d, the distribution of phosphors is very uniform. This is one of the advantages of gel casting [31]. The presence of water promoted the mixing of the slurry.…”

Section: Microscopic Characteristics Of Pigsmentioning

confidence: 98%

“…It depended on the two main mechanisms. On the one hand, the agglomeration phenomenon led to viscous slurry [31]. On the other hand, when APS was added into the slurry, the electrostatic repulsion between particles would increase and then the viscosity decreased [30].…”

Section: Physical Properties Of Pigs 321 Rheology Behaviormentioning

confidence: 99%

A Novel Preparation of Special-Shaped Phosphors-in-Glass by Gel Casting with Isobam for High-Power WLEDs Lighting

et al. 2022

Self Cite

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Phosphors-in-glass (PiGs) regarded as a promising phosphor-converter for white light emitting diodes (WLEDs) is being researched widely. However, there are few reports on the effect of changing the shape of PiGs on the color rendering index (CRI) and heat dissipation of WLEDs. In this paper, gel casting with Isobam was first attempted in preparing special-shaped PiGs successfully. It exhibited that 76 wt.% was the optimum solid content based on the rheological properties of slurry and the shrinkage of green bodies. The sintering rate should be kept at a low speed and glass transition temperature (Tg) of glass powders must be higher than sublimation temperatures (Ts) of APS and Isobam. The CRI of PiGs was increased by about 27% after changing the shape of PiGs from cylinder to dome. Most importantly, operating temperature also reduced effectively the increase of the surface area of PiGs. Therefore, changing the shape of PiGs by gel casting with Isobam is a creative way for high-power WLEDs lighting.

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“…Due to the COOgroups ionized from ammoniumcarboxylate (COO -NH 4 + ) groups, TAC was usually studied as an assisted additive to effectively decrease viscosity and have minimal impact on gelation strength. 25,29,30 However, the effects of TAC on the gelling behavior in an alkaline environment are still unidentified. Thus, LGZO slurries and green bodies with different TAC contents were tested to ensure how TAC influenced the ISOBAM-104 system.…”

Section: Mechanism Researchmentioning

confidence: 99%

Aqueous alkaline suitable gel system and related mechanism for highly transparent La_0.4Gd_1.6Zr₂O₇ ceramic preparation

et al. 2021

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In this work, a fabrication route combined optimized ISOBAM-104/TAC gelcasting (where TAC refers to triammonium citrate) and one-step sintering technology was developed to prepare highly transparent La x Gd 2-x Zr 2 O 7 (LGZO) ceramics. The gelling behavior in an alkaline environment was investigated, and the corresponding mechanism was systematically proposed for the advanced spontaneous gel system. The starting materials after ball milling were directly shaped into green bodies without any treatment, and high-quality LGZO ceramics were obtained by three-stage debinding and one-step sintering. The in-line transmittance of these ceramics reaches 74% at 1100 nm, which is about 95% of the theoretical value. This work not only establishes an efficient method to fabricate LGZO ceramics in large and complex shapes but also elucidates the gelling mechanism in alkaline, which expands the application of gel-casting technology in transparent ceramics.

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Ammonium citrate assisted surface modification and gel casting of YAG transparent ceramics

Cited by 21 publications

References 35 publications

Effect of vacuum sintering conditions on the properties of Y3Al5O12 : Ce luminescent ceramics

Effect of vacuum sintering conditions on the properties of Y3Al5O12 : Ce luminescent ceramics

A Novel Preparation of Special-Shaped Phosphors-in-Glass by Gel Casting with Isobam for High-Power WLEDs Lighting

Aqueous alkaline suitable gel system and related mechanism for highly transparent La_0.4Gd_1.6Zr₂O₇ ceramic preparation

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Ammonium citrate assisted surface modification and gel casting of YAG transparent ceramics

Cited by 21 publications

References 35 publications

Effect of vacuum sintering conditions on the properties of Y3Al5O12 : Ce luminescent ceramics

Effect of vacuum sintering conditions on the properties of Y3Al5O12 : Ce luminescent ceramics

A Novel Preparation of Special-Shaped Phosphors-in-Glass by Gel Casting with Isobam for High-Power WLEDs Lighting

Aqueous alkaline suitable gel system and related mechanism for highly transparent La0.4Gd1.6Zr2O7 ceramic preparation

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Product

Resources

About

Aqueous alkaline suitable gel system and related mechanism for highly transparent La_0.4Gd_1.6Zr₂O₇ ceramic preparation