Sintering and Densification of Transparent Ceramics

Kong, Ling Bing; Huang, Yizhong; Que, Wenxiu; Li, Sean; Zhang, Jian; Dong, Zhili; Tang, Dingyuan

doi:10.1007/978-3-319-18956-7_7

Cited by 7 publications

(11 citation statements)

References 151 publications

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“…At a temperature of 1450°C, only YAG phase is observed. Phase transformation temperatures are lower than those reported for the reaction between Al 2 O 3 and Y 2 O 3 powders [20,23], as the powder used in the experiments was mixed on the atomic level, and less energy was needed for atomic diffusion in comparison with energy needed for atomic diffusion in a mixture of alumina and yttria powder.…”

Section: Investigation Of Sintering Processmentioning

confidence: 73%

“…Additionally, monoclinic YAM, c-alumina and other phases are present in quantities of a few percent. The presence of YAP, YAM and YAG phases indicates that the powder was produced in an environment with inhomogeneous temperature distribution as YAM phase is formed in temperatures of about 900°C and YAP-above 1000°C [18][19][20].…”

Section: Powder Characterizationmentioning

confidence: 99%

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Investigation of YAP/YAG powder sintering behavior using advanced thermal techniques

Gizowska

Perkowski

Piątek

et al. 2019

J Therm Anal Calorim

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The fabrication process of transparent YAG (Y 3 Al 5 O 12 ) ceramics with an emphasis on examination of the sintering process and microstructural analysis is reported herein. Nanometric powder with an equivalent spherical diameter d BET = 60 nm consists mainly of hexagonal YAP phase (YAlO 3 ). According to sintering analysis carried out using a dilatometer and high-temperature XRD analysis, the phase composition and phase transformation taking place at elevated temperatures accompany the sintering process and the fastest sintering rate was observed at temperatures of YAG formation. Based on the dilatometric and XRD analyses vs temperature, three temperatures were selected for pressureless sintering. Presintered samples were subjected to sintering under isostatic pressure using a hot isostatic pressing, after which transparent YAG was obtained. The best results were obtained for samples presintered at a relatively low temperature of 1600°C, and for thus obtained sample, the in-line transmittance was 64% at k = 808 nm.

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Section: Investigation Of Sintering Processmentioning

confidence: 73%

Section: Powder Characterizationmentioning

confidence: 99%

Investigation of YAP/YAG powder sintering behavior using advanced thermal techniques

Gizowska

Perkowski

Piątek

et al. 2019

J Therm Anal Calorim

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“…Metal ceramic -Spinel material has good thermal shock resistance related characteristics; therefore, it is used for infrared transparent domes of military missiles [18]. In future, the promising infrared inert and transparent material are Yttrium oxide or Yttria/Magnesia composites, which still are under development [19,20] and not available in stock. So, after evaluation of all these parameters, Spinel was chosen as the optimal material.…”

Section: Infrared Measurement Methodsmentioning

confidence: 99%

Measurement of water temperature and velocity fields by applying thermography on two-phase flow through horizontal rectangular channel

Laurinavicius¹,

Šeporaitis²,

Valinčius³

et al. 2018

THERM SCI

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Original scientific paper https://doi.org/10.2298/TSCI160502129LThe infrared thermography and optical-flow based method were proposed for the measurement of water temperature and velocity fields in stratified steam-water flow through horizontal channel. Generally, this method is applicable for any turbulent flow with temperature gradient. Spinel polycrystalline (MgAl 2 O 4 ) material was chosen for infrared optical window, as, besides excellent optical properties, it has exceptional durability in harsh environment. Different mounting types and dimensions were tested in order to investigate Spinel application possibilities and limitations. A significant influence of window specific thermal radiation on measurement results (>20% inaccuracy) was observed during experiments. The best identified configuration ensures good temperature measurement accuracy (<=2%). Graphical analysis was applied to infrared images, and good results of turbulence structure identification were achieved using combined local-global optical flow technique.

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“…As highly transparent ceramics require full density, well-reputed wisdom believes that ceramic powders with high sintering e ciency for obtaining highly transparent ceramics have some important characteristics including small crystallite size, narrow size distribution, spherical/near-spherical shape, and low-degree agglomeration [7]. It is well known that the surface energy of starting powders is serving as the driving force for densi cation during the sintering process [8,9].…”

Section: Introductionmentioning

confidence: 99%

“…Transparent ceramics can nd a wide range of applications, such as transparent armors, infrared (IR) domes/windows, host material for uorescence application, and laser hosts, on account of their processing exibility in fabricating large-sized or complex-shaped products [1][2][3][4][5][6]. In most cases, the preparation process of any ceramics is sintering the consolidated/packed powders at high temperatures [7]. Therefore, the properties of the powder signi cantly in uence the microstructures and performances of transparent ceramics.…”

Section: Introductionmentioning

confidence: 99%

An Improving Densification in Spark Plasma Sintering Ultrafine-grained Y2O3 Transparent Ceramic by Particle Fracture and Rearrangement

Huang¹,

Shi²,

Zhang³

et al. 2021

Preprint

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Herein, we report a new strategy on an improving densification in spark plasma sintering (SPS) ultrafine-grained Y2O3 transparent ceramic using anisotropic-shaped nanorod powders. At the low temperature stage (<600°C), fracture and rearrangement of nanorod powders will appear which can further improve the initial density of particle compact and reduce the initial particle size. When the temperature reaches beyond 600°C, the sintering efficiency of nanorod powder compact will exceed that of the green body packed by spherical powders. The ceramic sample sintered at 1300°C from nanorods is transparent with ultra-fine grain and shows good optical and mechanical properties, while the corresponding ceramic from near-spherical nanocrystalline powders is not dense enough and opaque.

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Sintering and Densification of Transparent Ceramics

Cited by 7 publications

References 151 publications

Investigation of YAP/YAG powder sintering behavior using advanced thermal techniques

Investigation of YAP/YAG powder sintering behavior using advanced thermal techniques

Measurement of water temperature and velocity fields by applying thermography on two-phase flow through horizontal rectangular channel

An Improving Densification in Spark Plasma Sintering Ultrafine-grained Y2O3 Transparent Ceramic by Particle Fracture and Rearrangement

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