Comparative Study of Solid-Phase and Liquid-Phase Assisted Sintering of Nb2O5-Doped Alumina

2014 ◽  
Vol 798-799 ◽  
pp. 691-695 ◽  
Author(s):  
Willian Trindade ◽  
Marcelo Henrique Prado da Silva ◽  
Alaelson Vieira Gomes ◽  
Carlos Frederico de Matos Chagas ◽  
Luis Henrique Leme Louro ◽  
...  
Keyword(s):  
Solid State ◽  
Liquid Phase ◽  
Comparative Study ◽  
Solid Phase ◽  
Eutectic Reaction ◽  
The Other ◽  
Sintering Behavior ◽  
Solid State Sintering ◽  
Phase Loss

This work investigated the sintering behavior of alumina doped with 4wt% niobia. Three sintering temperatures were investigated: 1400°C, 1450°C and 1500°C. The first temperature leads to solid-phase assisted sintering (SSS) while the other ones develop liquid-phase assisted sintering (LPS). The presence of liquid phase in the second case is due to an eutectic reaction occurring at 1440°C ± 20°C in the alumina-niobia system. The sintering behavior was assessed by measuring the final densities. The results indicated that the 1400°C solid-state sintering, comparatively, was better. This paper proposes that defects associated to the substitution of Al+3by Nb+5in the alumina cation sub-lattice, fostered diffusion and SSS. Sintering at 1500°C presented the lowest density, apparently due to niobate (liquid phase) loss, at this temperature as observed by XRD results.

A comparative study of sintered and melt-grown recrystallized YBa2Cu3Ox

1989 ◽  
Vol 4 (1) ◽  
pp. 28-32 ◽  
Author(s):  
Hamid Hojaji ◽  
Karen A. Michael ◽  
Aaron Barkatt ◽  
Arthur N. Thorpe ◽  
Matthew F. Ware ◽  
...  
Keyword(s):  
Solid State ◽  
Comparative Study ◽  
The Other ◽  
Current Paper ◽  
Molten State ◽  
Magnetization Measurements ◽  
Yttrium Barium Cuprate ◽  
Solid State Sintering ◽  
Yttrium Barium

This paper compares the properties of yttrium barium cuprate bulk specimens prepared by means of solid-state sintering on one hand and of growth from a largely molten state on the other. The current paper focuses on magnetization measurements at 77 K which show specimens made by the latter method to have high remanence magnetization values.

Microstructure Observation and Analysis of Powders, Green Bodies Used for Sintering SiC Ceramics by SEM

2012 ◽  
Vol 624 ◽  
pp. 107-111
Author(s):  
Yong Jiang ◽  
Lan Er Wu ◽  
Yu Hong Chen ◽  
You Jun Lu ◽  
Zhen Kun Huang
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Solid State ◽  
Liquid Phase ◽  
Liquid Phase Sintering ◽  
Microstructure Observation ◽  
Sic Ceramics ◽  
Solid State Sintering ◽  
Scanning Electron

The present work observed and analyzed the microstructures of various starting powders including SiC, AlN-R (Y / La) 2O3 as additives for LPSing (Liquid Phase Sintering), B/C additives for SSSing (Solid State Sintering), as well as the spray granulated powders as comparison, by using scanning electron microscopy SEM. The microstructure of molded green bodies was also posted. Present paper opens out the characters of the various perfect and defect of microstructures of these samples. Their effect on the processing and properties of SiC ceramics was analyzed and discussed.

Effects of ThO2 on the solid-state sintering behavior of W–Ni–Fe alloy

2011 ◽  
Vol 29 (1) ◽  
pp. 112-116 ◽  
Author(s):  
Youngmoo Kim ◽  
Seong Lee ◽  
Eun-Pyo Kim ◽  
Joon-Woong Noh
Keyword(s):  
Solid State ◽  
Sintering Behavior ◽  
Solid State Sintering

The Influence of AST Doping on the Dielectric Properties of MgTiO3-Based Ceramics Fabricated by Soild-State Sintering

2013 ◽  
Vol 634-638 ◽  
pp. 2378-2382
Author(s):  
Chun Yuan Luo ◽  
Jing Xiao Liu ◽  
Fei Shi ◽  
Ji Wei Wu ◽  
Chao Qian ◽  
...  
Keyword(s):  
Dielectric Properties ◽  
Solid State ◽  
Liquid Phase ◽  
Dielectric Loss ◽  
Sintering Temperature ◽  
Liquid Phase Sintering ◽  
Sintering Process ◽  
Solid State Sintering ◽  
Doped Zno

AST-doped ZnO-MgTiO3-SrTiO3ceramics were prepared using a solid-state sintering process. The effects of AST (Al2O3-SiO2-TiO2) on the dielectric properties of MgTiO3-based ceramics were investigated. The results indicate that AST-doped MgTiO3-based ceramics could be obtained after 1205~1280°C sintering for 3 h. The XRD results indicate that the obtained MgTiO3-based ceramics contain high percentage of MgTi2O5 phase and the percentage increased with the increase of AST content. It was found that the occurred liquid-phase sintering by adding AST glass could effectively lower the sintering temperature and decrease the dielectric loss of MgTiO3-based ceramics. A minimum tanδ of 1.5×10-4 associated with εr=19.0 was achieved for 6.0 wt% AST-doped samples sintered at 1255°C.

Sintering Fundamentals: Historical Aspects

2016 ◽  
Vol 835 ◽  
pp. 1-49 ◽  
Author(s):  
Gopal S. Upadhyaya
Keyword(s):  
Solid State ◽  
Liquid Phase ◽  
External Pressure ◽  
Liquid Phase Sintering ◽  
Theory And Practice ◽  
Activated Sintering ◽  
Historical Aspects ◽  
Seminal Work ◽  
Solid State Sintering ◽  
Ancient Times

Sintering as a technology has been followed from ancient times. However, as science it emerged in 1940s with the seminal work of Frenkel, Huettig, Kuczynski, Lenel, Kingery and Hausner. The present paper covers the historical aspects of sintering fundamentals , right from solid state sintering to liquid phase sintering, activated sintering, electronic theory of sintering, sintering with external pressure, constrain sintering etc. Various mechanisms of sintering with their microstructural relationships have been highlighted. A generalized approach to sintering is called for, which may to great extent bridge the gap between sintering theory and practice.

A Comparative Study of Manual Methods for Serum Triglyceride Estimation

1975 ◽  
Vol 12 (1-6) ◽  
pp. 9-13 ◽  
Author(s):  
M. E. Goldfinhc ◽  
K. Prudhoe
Keyword(s):  
Liquid Phase ◽  
Comparative Study ◽  
Solid Phase ◽  
Serum Triglyceride ◽  
Phase Partition ◽  
Solid Phase Adsorption ◽  
Manual Methods ◽  
The Cost ◽  
Enzymatic Methods

A comparison is made of the accuracy, precision, and convenience of two manual serum triglyceride methodologies based on solid phase adsorption and liquid phase partition procedures. Both methods are accurate but the precision and convenience of the latter is far superior. The use of home made reagents reduces the cost of both substantially below that of any commercial alternative, including the popular enzymatic methods.

scholarly journals Excess Li2O Additives to Promote Grain Boundary Growth and Improve Ionic Conductivity of LiTa2PO8 Solid Electrolytes

2021 ◽  
Vol 8 ◽  
Author(s):  
Qian Zhang ◽  
Fuhai Meng ◽  
Ruixiong Liao ◽  
Long Chen ◽  
Mengqian Xu ◽  
...  
Keyword(s):  
Solid State ◽  
Liquid Phase ◽  
Ionic Conductivity ◽  
Grain Boundary ◽  
Solid Phase ◽  
Synthesis Method ◽  
Lithium Ion ◽  
Liquid Phase Sintering ◽  
Diffusion Activation Energy ◽  
The Impact

LiTa2PO8 (LTPO) is a new solid-state lithium ion electrolyte material reported in the latest research, which has high bulk ionic conductivity and low grain boundary ion conductivity. However, it is difficult to density with conventional sintering methods. Herein, in this work, the solid-phase synthesis method was used to prepared the LTPO solid-state electrolyte, and the influence of the amount of lithium on the structure and performance of LTPO electrolyte material was investigated. The results show that the excess Li2O does not increase other impurities and does not change the structure of the material, but the liquid phase produced by the excess Li2O can promote the elimination of interfacial pores, accelerate the direct bonding of grains and improve the ionic conductivity of grain boundary, thus improving the overall ionic conductivity of the material. Considering the volatilization of lithium and the impact of liquid phase sintering at high temperatures and the content restructuring, after adding 20 wt% excess formulation of Li2O, the resultant of LTPO density is 5.0 g/cm3, the density reaches 85.58%. As a result, the total ionic conductivity of the electrolyte is 3.28 × 10–4 S/cm at 25°C, and the Li-ion diffusion activation energy is 0.27 eV. In addition, after loading this electrolyte into a Li–Li symmetric battery, it is proved that the electrolyte has lithium ion transport performance and can be used in all-solid-state batteries. However, it is also found from cyclic voltammetry (CV) and X-ray photoelectron spectroscopy (XPS) analysis that the interface between LTPO material and Li is unstable, and Ta5+ ions are reduced, which will be another key issue to be addressed in the future.

Solid-State Microwave Modification of Flocculants for Wastewater Treatment

2019 ◽  
Vol 23 (8) ◽  
pp. 26-31
Author(s):  
T.V. Shevchenko ◽  
Yu.V. Ustinova ◽  
A.M. Popov ◽  
Sh.A. Fairushin ◽  
V.P. Yustratov
Keyword(s):  
Shear Stress ◽  
Wastewater Treatment ◽  
Solid State ◽  
Liquid Phase ◽  
Physical Properties ◽  
Sedimentation Rate ◽  
Comparative Evaluation ◽  
Solid Phase ◽  
Phase Modification ◽  
Preliminary Preparation

Presents the results of research on the creation of effective technical preparations – flocculants based on polyacrylamide, modified by the physical action of microwaves with frequency 4.5 GHz on their solid phase. The change in the basic physical properties of the working solutions of flocculants was established (dissolution rate, shear stress values, efficiency and sedimentation rate). Mechanisms of microwave solid phase modification and features of dissolution of pretreated batches of solid polyelectrolyte fractions are proposed. On the basis of rheological studies of prepared working solutions of flocculants and test experiments on the flocculation of suspension a comparative evaluation of effectiveness of the action of microwaves on polyectrolyte during its preliminary preparation using solid phase and liquid phase modifications.

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