transparent y2o3 by hot-pressing - sciencedirect

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Transparent polycrystalline alumina obtained by SPS:Green

Available onlineat Journal of the European Ceramic Society 32 (2012) 2909–2915 Transparent polycrystalline alumina obtained by SPS: Green bodies processing effect Lucile Lallemant a,b,∗, Gilbert Fantozzi a,b, Vincent Garnier a,b, Guillaume Bonnefont a,b

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Fabrication of Y2O3 transparent ceramics by hot isostatic

2019/6/1Conventionally, transparent Y 2 O 3 ceramics were fabricated by hot pressing or pressureless sintering in a reducing atmosphere using commercial yttria powders with sintering additives such as LiF [], HfO 2 [], ThO 2 [], and ZrO 2 [].

Fabrication of Yb,La:CaF2 transparent ceramics by air pre

Yb,La:CaF 2 nano-powders doped with different Yb 3+ concentrations as 1, 2, 3, 5 at.% were synthesized by the co-precipitation method. The Yb,La:CaF 2 powders which were in pure cubic CaF 2 phase. The Yb,La:CaF 2 transparent ceramics were prepared by the air pre-sintering at different temperatures for 2 h with hot isostatic pressing (HIP) post-treatment at 650 C for 2 h under 62 MPa Ar.

Synthesis of Yb:Y2O3 nanoparticles and fabrication of

Then, hot isostatic pressing treatment of the pre-sintered samples using the glass-canning technique reactivates sintering and coarsening, which causes almost complete pore elimination. Furthermore, a liquid phase formed during sintering because of pollution from the furnace.

Transparent polycrystalline alumina obtained by SPS:Green

Available onlineat Journal of the European Ceramic Society 32 (2012) 2909–2915 Transparent polycrystalline alumina obtained by SPS: Green bodies processing effect Lucile Lallemant a,b,∗, Gilbert Fantozzi a,b, Vincent Garnier a,b, Guillaume Bonnefont a,b

Fabrication of Highly Transparent Y2O3 Ceramics with

It was found that doping a small amount (0.01-0.15 wt.%) of CaO could greatly improve the densification rate of Y2O3. With an optimized CaO dosage of 0.02 wt.% combined with the low temperature vacuum sintering plus hot isostatic pressing (HIP-ing), Y2O3 ceramics with in-line transmittance of 84.87% at 1200 nm and 81.4% at 600 nm were obtained.

Distribution of Y2O3 particles in the Pt

JOURNAL OF MATERIALS SCIENCE LETTERS 19 (2000) 151 – 152 Distribution of Y O particles in the Pt-Y O system 2 3 2 3 determined by STEM ˇ ˇ M. BESTERCI, M. SLES AR, L. KOV A C Institute of Materials Research, Slovak Academy of Sciences, Watsonova 47, 043 53 Kosice, Slovakia J. IVAN Institute of Materials and Mechanismes Mechanics, Slovak Academy of Sciences, P.O. Box 95, 830

Growth of Tm3+

Single -crystal growth of Tm3+-doped Y2O3, Sc2O3, and Lu2O3 sesquioxides, with a melting point around 2400 C, by the micropulling down technique is reported. Crystal quality and composition of the crystals were evaluated by rocking curve and energy-dispersive X-ray (EDX) analyses, respectively. Optical properties including optical transmittance and photoluminescence decay profiles were also

Transparent polycrystalline alumina obtained by SPS:Green

Available onlineat Journal of the European Ceramic Society 32 (2012) 2909–2915 Transparent polycrystalline alumina obtained by SPS: Green bodies processing effect Lucile Lallemant a,b,∗, Gilbert Fantozzi a,b, Vincent Garnier a,b, Guillaume Bonnefont a,b

Bryan Sadowski Inventions, Patents and Patent

Abstract: A transparent polycrystalline ceramic having scattering and absorption loss less than 0.2/cm over a region comprising more than 95% of the originally densified shape and a process for fabricating the same by hot pressing. The ceramic can be any suitable

High optical quality Y2O3 transparent ceramics with fine grain

3 transparent ceramics with fine grain size were successfully fabricated by air pre-sintering at various temperature ranging from 1500 to 1600 1C combined with a post-hot-isostatic pressing (HIP) treatment using co-precipitated powders as the starting material.

Effect of citric acid on the microstructure and optical

2019/9/6Reset your password If you have a user account, you will need to reset your password the next time you login. You will only need to do this once.1 School of Civil Engineering, Shaoguan University, Shaoguan 512005, Guangdong, People's Republic of China 2 School of Materials Science and Engineering, Shanghai Institute of Technology, Shanghai 201418, People's Republic of China

(PDF) Effects of Y2O3 on the mechanical properties of

Specifically, when the pressing device (VVPgr-80–2300, China) at 1450 1C for 1 h under content of Y2O3 is 1.0 vol.%, the microstructure of the Ti/Al2O3 pressure of 30 MPa. Sintered samples were taken out when cooled composites show fine grain, dense structure and

Effect of LiF addition on the preparation of transparent

1993/3/15In this experiment, the effect of LiF as sintering additive and the method of loading in the preparation of transparent Y 2 O 3 were investigated, together with its spectroscopic properties. Transparent Y 2 O 3 was fabricated by vacuum hot pressing of the loading stepwise in graphite dies under the following conditions: temperature, 1573 K; maximum pressure, 44 MPa; and LiF content,

Densification and Electrical Resistance of Y2O3 at

Dutta and Gazza [4] used vacuum hot pressing at temperatures ranging from 1300 to 1500 C and pressures up to 480 bars to produce transparent Y 2 O 3 specimens. The present work was undertaken in order to determine the densification of Y 2 O 3 with or without ThO 2 additions using vacuum sintering, regulr hot pressing, and high pressure hot pressing techniques.

A robust approach for highly transparent Y2O3 ceramics by

highly transparent ceramics by post-annealing. To solve this problem, the transparent ceramics fabricated via sintering in a vacuum need post-annealing in air for a long time and then further a hot isostatic pressing(HIP)procedure[13,19geous in the aspect of cost

Granulation of Y2O3 powders by a vibration method for

A modified vibrating screen method was employed to prepare granulated Y2O3 powders, which were used to fabricate transparent ceramics. The granulation process was carried out with yttrium-stabilized zirconia balls (5 mm in diameter) in a 200-mesh screen, which was

Electroluminescence of Y2O3:Eu and Y2O3:Sm films

Electroluminescence of Y2O3:Eu and Y2O3:Sm films Fig. 8. Shift of the luminance characteristics in the sta-bilization process of VLC of Y 2O 3:Eu,Sm films: 1 – initial specimen, after thermal treatment at 900 C for: 2 – 20 h, 3 – 100 h, 4 – 1000 h; 10– initial specimen, after thermal treatment at

Preparation of MgF 2 translucent ceramic by hot

The aim of this work was to prepare MgF2 translucent ceramic by using nanopowders as raw materials and to study its properties.The MgF2 nanopowders were prepared using chemical precipitation and the translucent ceramics were fabricated by hot-pressing sintering in a vacuum environment. X-ray diffraction analysis showed that the powders were homogeneous with an average particles size about

Materials

Highly transparent Y2O3 ceramics were successfully fabricated with CaO as sintering aid. The microstructure evolution, optical transmittance, hardness and thermal conductivity of the Y2O3 ceramics were investigated. It was found that doping a small amount (0.01ndash;0.15 wt.%) of CaO could greatly improve the densification rate of Y2O3. With an optimized CaO dosage of 0.02 wt.% combined with

Fabrication of Yb,La:CaF2 transparent ceramics by air pre

Yb,La:CaF 2 nano-powders doped with different Yb 3+ concentrations as 1, 2, 3, 5 at.% were synthesized by the co-precipitation method. The Yb,La:CaF 2 powders which were in pure cubic CaF 2 phase. The Yb,La:CaF 2 transparent ceramics were prepared by the air pre-sintering at different temperatures for 2 h with hot isostatic pressing (HIP) post-treatment at 650 C for 2 h under 62 MPa Ar.

Synthesis of Yb:Y2O3 nanoparticles and fabrication of

Then, hot isostatic pressing treatment of the pre-sintered samples using the glass-canning technique reactivates sintering and coarsening, which causes almost complete pore elimination. Furthermore, a liquid phase formed during sintering because of pollution from the furnace.

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Fabrication of Highly Transparent Y2O3 Ceramics with

It was found that doping a small amount (0.01-0.15 wt.%) of CaO could greatly improve the densification rate of Y2O3. With an optimized CaO dosage of 0.02 wt.% combined with the low temperature vacuum sintering plus hot isostatic pressing (HIP-ing), Y2O3 ceramics with in-line transmittance of 84.87% at 1200 nm and 81.4% at 600 nm were obtained.

(PDF) Fabrication of laminated ZrC

The compact laminated ZrC- SiC composite sintered by vacuum hot-pressing at 1650 C for 90 min under pressure of 20 MPa was researched by X-ray diffraction and scanning electron The results showed that interlayer bonding is tight, and no disordered phase has formed in the interlayers of ZrC or SiC, and the combination mode is physical mechanism.

Fabrication of Highly Transparent Y2O3 Ceramics with

It was found that doping a small amount (0.01-0.15 wt.%) of CaO could greatly improve the densification rate of Y2O3. With an optimized CaO dosage of 0.02 wt.% combined with the low temperature vacuum sintering plus hot isostatic pressing (HIP-ing), Y2O3 ceramics with in-line transmittance of 84.87% at 1200 nm and 81.4% at 600 nm were obtained.

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