Bimodal transparent alumina ceramics prepared with micro/nano-particles under high pressure

2016 ◽  
Vol 122 ◽  
pp. 54-58 ◽  
Author(s):  
Fangming Liu ◽  
Duanwei He ◽  
Qiang Wang ◽  
Wei Ding ◽  
Jin Liu ◽  
...  
Keyword(s):  
High Pressure ◽  
Nano Particles ◽  
Alumina Ceramics ◽  
Transparent Alumina

Optical and mechanical properties of transparent alumina fabricated by high-pressure spark plasma sintering

2019 ◽  
Vol 39 (8) ◽  
pp. 2712-2719 ◽  
Author(s):  
Barak Ratzker ◽  
Avital Wagner ◽  
Maxim Sokol ◽  
Sergey Kalabukhov ◽  
Moshe P. Dariel ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
High Pressure ◽  
Spark Plasma Sintering ◽  
Transparent Alumina ◽  
Plasma Sintering ◽  
Spark Plasma ◽  
Optical And Mechanical Properties

scholarly journals Effect of the surfactant CTAB on the high pressure behavior of CdS nano particles

2012 ◽  
Vol 377 ◽  
pp. 012012 ◽  
Author(s):  
A K Mishra ◽  
Nandini Garg ◽  
K K Pandey ◽  
Vineet Singh
Keyword(s):  
High Pressure ◽  
Nano Particles ◽  
Pressure Behavior

scholarly journals High-pressure spark plasma sintering of MgO-doped transparent alumina

2012 ◽  
Vol 120 (1399) ◽  
pp. 116-118 ◽  
Author(s):  
Byung-Nam KIM ◽  
Keijiro HIRAGA ◽  
Salvatore GRASSO ◽  
Koji MORITA ◽  
Hidehiro YOSHIDA ◽  
...  
Keyword(s):  
High Pressure ◽  
Spark Plasma Sintering ◽  
Transparent Alumina ◽  
Plasma Sintering ◽  
Spark Plasma

scholarly journals Can Ultra-fast High Temperature Sintering (UHS) Boost Transparency of Alumina?

2021 ◽  
Author(s):  
Milad Kermani ◽  
Danyang Zhu ◽  
Jiang Li ◽  
Jinghua Wu ◽  
Yong Lin ◽  
...  
Keyword(s):  
Grain Size ◽  
High Temperature ◽  
Low Temperature ◽  
Green Density ◽  
Alumina Ceramics ◽  
Fine Grained ◽  
Reducing Atmosphere ◽  
Transparent Alumina ◽  
Rapid Sintering ◽  
First Time

Abstract Established routes for consolidation of transparent alumina ceramics by pressure-less sintering requires several hours of dwelling in a reducing atmosphere at a temperature exceeding 1600 ℃. Here, for the first time, we report on low temperature and ultrafast consolidation of translucent alumina ceramics. Transparency was promoted by the synergistic of high initial green density (62.7 %) and rapid sintering using Ultra-fast High Temperature Sintering (UHS) technique. The proposed approach, using a heating rate of 430 ℃/min and dwelling time of 15 minutes, resulted in ultra-fine-grained translucent alumina ceramics at 1359 ± 57 ℃ with a grain size of 0.39 µm, and an in-line transmittance of 28.7 % at a wavelength of 700 nm. For comparison, conventionally fired counterparts were opaque due to their incomplete densification, pore coalescence.

scholarly journals Processing and properties of luminescent Cr3+ doped transparent alumina ceramics

2020 ◽  
Vol 40 (7) ◽  
pp. 2573-2580 ◽  
Author(s):  
Katarina Drdlikova ◽  
Robert Klement ◽  
Daniel Drdlik ◽  
Dušan Galusek ◽  
Karel Maca
Keyword(s):  
Alumina Ceramics ◽  
Transparent Alumina

Particle in a Cylinder, in a Sphere, and on a Helix

2020 ◽  
pp. 340-355
Author(s):  
Jochen Autschbach
Keyword(s):  
High Pressure ◽  
Transition Metal ◽  
Molecular Wires ◽  
Nano Particles ◽  
Magic Numbers ◽  
Electron Motion ◽  
Conjugated Molecules ◽  
Pi Conjugated ◽  
Nano Rods ◽  
Nano Wires

The particle in a box from an earlier chapter is useful as a model to treat the electron motion in linear molecular ‘wires’, rectangular surfaces, and cuboid nano-particles. In this chapter, similar models are developed for spherical and cylindrical nano-particles, and helical nano-wires. Applications of these models that have been reported in the literature are discussed. For example, the particle in a cylinder model has been applied to treat the absorption spectra of silver nano-rods. The particle in a sphere model can be used tom rationalize the occurrence of sodium nano-clusters with certain ‘magic’ numbers of Na atoms. The model also explains the behaviour of potassium under high pressure, where the element starts to behave like a transition metal. The particle on a helix has been used to rationalize the optical activity of helical pi-conjugated molecules.

Advance of Sintering Methods of High Purity Alumina Ceramics

2016 ◽  
Vol 703 ◽  
pp. 76-80 ◽  
Author(s):  
Qing Bo Tian ◽  
Jin Shan Dai ◽  
Li Na Xu ◽  
Xiu Hui Wang
Keyword(s):  
High Pressure ◽  
Spark Plasma Sintering ◽  
High Purity ◽  
Alumina Ceramics ◽  
Grain Coarsening ◽  
Plasma Sintering ◽  
Wide Range ◽  
High Pressure Sintering ◽  
Conventional Sintering ◽  
Spark Plasma

The sintering of alumina ceramics with high-purity has gained much attention due to their wide range applications. The improved sinteirng methods, such as the spark plasma sintering, super-high pressure sintering, two-step sintering, and so on, have advantages on the decreasing the sinteirng temperature or inhibiting the grain coarsening, compared with the conventional sintering.

Effect of La2O3 on Microstructure and Transmittance of Transparent Alumina Ceramics

2006 ◽  
Vol 24 (1) ◽  
pp. 72-75 ◽  
Author(s):  
Qiuhong Yang ◽  
Zhijiang Zeng ◽  
Jun Xu ◽  
Hongwei Zhang ◽  
Jun Ding
Keyword(s):  
Alumina Ceramics ◽  
Transparent Alumina

scholarly journals Improved transparency and hardness in α-alumina ceramics fabricated by high-pressure SPS of nanopowders

2017 ◽  
Vol 43 (1) ◽  
pp. 275-281 ◽  
Author(s):  
Shaghayegh Ghanizadeh ◽  
Salvatore Grasso ◽  
Prabhu Ramanujam ◽  
Bala Vaidhyanathan ◽  
Jon Binner ◽  
...  
Keyword(s):  
High Pressure ◽  
Alumina Ceramics
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