scholarly journals Ultra-fast High Temperature Sintering (UHS) of ultra-fine-grained translucent alumina ceramics

Open Ceramics ◽  
2021 ◽  
pp. 100202
Author(s):  
Milad Kermani ◽  
Danyang Zhu ◽  
Jiang Li ◽  
Jinghua Wu ◽  
Yong Lin ◽  
...  
Keyword(s):  
High Temperature ◽  
Alumina Ceramics ◽  
Fine Grained

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.

Densification kinetics of Alumina During Microwave Sintering

1992 ◽  
Vol 269 ◽  
Author(s):  
Jiping Cheng ◽  
Jinyu Qiu ◽  
Jian Zhou ◽  
Neng Ye
Keyword(s):  
High Temperature ◽  
Grain Growth ◽  
Microwave Field ◽  
Microwave Sintering ◽  
Alumina Ceramics ◽  
Kinetics Parameters ◽  
Fine Grained ◽  
Prolonged Time ◽  
Conventional Sintering ◽  
Kinetics Of

ABSTRACTSome kinetics parameters of alumina during microwave sintering were studied and compared with that during conventional sintering. The results demonstrated that the sintering rates for microwave processing were much greater than that for conventional processing, and the grain growth of alumina was rapid with prolonged time at high temperature in a microwave field. It was indicated that the microwave sintering at higher temperatures for a shorter time was favorable for preparing high density and fine-grained alumina ceramics.

scholarly journals How do the grains slide in fine-grained zirconia polycrystals at high temperature?

2007 ◽  
Vol 91 (12) ◽  
pp. 121904 ◽  
Author(s):  
Maren Daraktchiev ◽  
Robert Schaller ◽  
Laurent Gremillard ◽  
Thierry Epicier ◽  
Jerome Chevalier ◽  
...  
Keyword(s):  
High Temperature ◽  
Fine Grained

scholarly journals Assessment of factors influencing surface recrystallisation during high temperature exposure of fine-grained PM 2000 alloy

2007 ◽  
Vol 471 (1-2) ◽  
pp. 120-124 ◽  
Author(s):  
J.L. González-Carrasco ◽  
J. Chao ◽  
C. Capdevila ◽  
J.A. Jiménez ◽  
V. Amigó ◽  
...  
Keyword(s):  
High Temperature ◽  
High Temperature Exposure ◽  
Fine Grained ◽  
Factors Influencing ◽  
Temperature Exposure

High Temperature Oxidation Behavior of Ti3SiC2 in Air

2005 ◽  
Vol 486-487 ◽  
pp. 97-100
Author(s):  
J.H. Ko ◽  
Sung Sic Hwang ◽  
Sang Whan Park ◽  
Dong Bok Lee
Keyword(s):  
High Temperature ◽  
Hot Pressing ◽  
High Temperature Oxidation ◽  
Oxidation Behavior ◽  
Coarse Grained ◽  
Amorphous Sio2 ◽  
Temperature Oxidation ◽  
Fine Grained ◽  
High Temperature Oxidation Behavior ◽  
Tio2 Rutile

Fine-grained and coarse-grained Ti3SiC2 materials were synthesized by hot pressing using TiC0.67 and Si powders as starting materials. The oxidation between 900 and 1100oC in air resulted in the formation of an outer TiO2 (rutile) layer and an inner mixed layer of TiO2 and amorphous SiO2, accompanying the liberation of carbon into the air. Fine-grained Ti3SiC2 displayed better oxidation resistance than coarse-grained one, with activation energies of 376.5~380 kJ/mol for oxidation.

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