Polycrystalline alumina ceramics doped with nanoparticles for increased transparency

Trunec, Martin; Maca, Karel; Chmelík, Radim

doi:10.1016/j.jeurceramsoc.2014.09.041

Cited by 43 publications

(29 citation statements)

References 38 publications

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“…This means that they reached almost full density and their in-line transmission was controlled by the grain size. RIT values from 51 to 64% at a wavelength of 640 nm have been reported by several authors [6][7][8] for 0.8 mm thick samples with a grain size from 470 to [4,10,11], which were measured at a wavelength of 645 nm and the value from [9], which was measured at a wavelength of 632.8 nm. 580 nm.…”

Section: Introductionmentioning

confidence: 59%

Transparent alumina ceramics densified by a combinational approach of spark plasma sintering and hot isostatic pressing

Trunec

Klimke

Shen

2016

Journal of the European Ceramic Society

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Section: Introductionmentioning

confidence: 59%

Transparent alumina ceramics densified by a combinational approach of spark plasma sintering and hot isostatic pressing

Trunec

Klimke

Shen

2016

Journal of the European Ceramic Society

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“…The samples were pre-sintered to 95-96 % of the theoretical density, which means only closed porosity was present [10,11]. The samples doped with the P_S powder were presintered using two different regimes: single step pre-sintering (SSP) -and two-step presintering (TSP) in order to establish more appropriate pre-sintering regime.…”

Section: Methodsmentioning

confidence: 99%

“…Porosity in polycrystalline alumina ceramics is usually considered to be closed if the relative density exceeds 95 % of the theoretical density [10,11]. In order to minimize the grain size the samples pre-sintered to relative densities ranging between 95.8 and 97.8 % of TD were selected for HIP experiments.…”

Section: Pre-sintering Regimementioning

confidence: 99%

“…Based on the results from previous work [10], the temperature 1280 °C and a holding time of 3 h was selected as the most suitable conditions for hot isostatic pressing (allowing full densification without observable grain growth). All samples sintered to full density (> 99.9 % of TD); no differences could be recorded using the applied measuring method.…”

Section: Pre-sintering Regimementioning

confidence: 99%

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Luminescent Er 3+ doped transparent alumina ceramics

Drdlíková

Klement²,

Drdlík

et al. 2017

Journal of the European Ceramic Society

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We report on successful preparation of Er 3+ doped transparent alumina (0.1-0.17 at. %) exhibiting visible light photoluminescence using wet shaping method and hot isostatic pressing. The effects of dopant amount, type of doping powder and powder pre-treatment on final microstructure, real in-line transmittance and photoluminescence characteristics were studied.The real in-line transmittance ranged between 28-56 %, depending on processing parameters.The transparency decreased with increased amount of dopant. The decrease is dependent on the type of doping powder and its pre-treatment.The photoluminescence spectra measured in both visible and NIR region showed typical emission bands due to the presence of Er 3+ ions. The decay profiles of the 4 S3/2→ 4 I15/2 transition were fitted with a 2-exponential function, with faster component in the range of 360-700 ns and slower component around 1.6-2.4 μs. The intensity of emissions and lifetime of the 4 S3/2 level decrease significantly with increasing concentration of Er 3+ ions.

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“…HIP provides significantly finer grain structure in final product than in case of mere pressure-less sintering [4]. Pore closure triggers accelerated grain growth [5], leading to deterioration of numerous functional properties (optical transparency [6], mechanical properties [7], etc.).…”

Section: Introductionmentioning

confidence: 99%