scholarly journals Single‐step densification of nanocrystalline CeO 2 by the cold sintering process

2020 ◽  
Vol 103 (5) ◽  
pp. 2979-2985 ◽  
Author(s):  
Thomasina H. Zaengle ◽  
Arnaud Ndayishimiye ◽  
Kosuke Tsuji ◽  
Zhongming Fan ◽  
Sun Hwi Bang ◽  
...  
Keyword(s):  
Single Step ◽  
Sintering Process

Electrical Resistance of Laser Sintered Direct-Write Deposited Materials for Microelectronic Applications

2004 ◽  
Vol 1 (4) ◽  
pp. 261-268 ◽  
Author(s):  
Valery R. Marinov
Keyword(s):  
Electrical Resistance ◽  
Screen Printing ◽  
Continuous Wave ◽  
New Technology ◽  
Single Step ◽  
Direct Write ◽  
Sintering Process ◽  
Heat Treated ◽  
Via Holes ◽  
Printing Processes

The direct write technology provides an interesting opportunity for plugging blind via holes as a more precise alternative to currently used screen printing processes. This technology provides a complete, void-less filling of the via and fabrication of the interconnects extending from the via in one single step. After deposition, the material is heat treated (sintered) to densify into a highly conductive solid. Sintering is usually accomplished by laser treatment. Some aspects of this relatively new technology, especially these related to the relationships between the laser sintering process and the deposited material properties are still largely unexplored. This paper presents experimental results for the microscale electrical resistance of two silver inks deposited by a direct write method and sintered with a continuous wave Nd:YAG laser. The resistance of the deposited and sintered silver lines and the resistance of the material in the plugged via holes was mapped by the advanced micro four-point probe technique. Results showed that higher laser powers reduce significantly the resistance of the silver inks. The importance of the deposited material sinterability is also emphasized.

scholarly journals Fabrication and Characterizations of YSZ Electrolyte Films for SOFC

2010 ◽  
Vol 434-435 ◽  
pp. 705-709 ◽  
Author(s):  
Min Fang Han ◽  
Zhi Bin Yang ◽  
Ze Liu ◽  
Hui Rong Le
Keyword(s):  
Grain Boundary ◽  
Grain Growth ◽  
Boundary Diffusion ◽  
Boundary Migration ◽  
Single Step ◽  
Grain Boundary Diffusion ◽  
Raw Material ◽  
Grain Boundary Migration ◽  
Sintering Process ◽  
Ysz Electrolyte

Yttria stabilized zirconia (YSZ) has been widely used as electrolyte in solid oxide fuel cell (SOFC). The effect of fabrication process on the properties of YSZ electrolyte thick film is discussed in the paper. With YSZ nano-powders of about 20-60nm as raw material, YSZ green adobe was fabricated by tape calendering process. Three-step sintering process was performed firstly holding at 1000°C for 2h, then raising to 1300~1400°C, then decreasing to 1200~1300°C within 30 minutes, and finally calcining at 1200~1300°C for 5~20 hrs. Dense YSZs with relative density of 96-99% are obtained; the grain size of YSZ was reduced to 0.5-3µm. During the process of grain growth, there are both grain boundary diffusion and grain boundary migration. The feasibility of densification without grain growth relies on the suppression of grain boundary migration while keeping grain boundary diffusion active at a temperature as low as 1200~1300°C. Whereas the electric conductivities of the YSZs are even higher than that obtained in conventional single step sintering process. The process is applied to the anode-supported SOFCs co-fired at 1250~1300°C, and the cathode-supported SOFCs co-fired at 1200~1250°C.

scholarly journals Analysis of the initial-stage sintering of mechanically activated SrTiO3

2019 ◽  
Vol 51 (2) ◽  
pp. 199-208
Author(s):  
J. Zivojinovic ◽  
V.P. Pavlovic ◽  
N.J. Labus ◽  
V.A. Blagojevic ◽  
D. Kosanovic ◽  
...  
Keyword(s):  
Mechanical Activation ◽  
Transport Mechanism ◽  
Single Step ◽  
Sintering Process ◽  
Activation Time ◽  
Product Analysis ◽  
Step Process ◽  
Initial Stage ◽  
Final Microstructure ◽  
Sintered Product

The initial-stage of sintering plays a significant role in determining the final microstructure that defines the main characteristics of electroceramics materials such as functional properties. In this article non-isothermal sintering of non-activated and mechanically activated SrTiO3 samples was investigated up to 1300?C. Dilatometric curves indicate that mechanical activation leads to an earlier onset of sintering, suggesting that it should lead to a more homogenous and denser sintered product. Analysis of the initial stage of sintering reveals that the sintering process of all examinated samples consists of tw? or three overlapping single-step processes, with a change in the dominant mass transport mechanism. The values of apparent activation energy of the considered single-step process exhibit a significant decrease with an increase in mechanical activation time. The values of the density of samples after isothermal sintering indicate that the final stage of sintering has not been reached by 1300?C.

Processing of Injection Moulded of Synthesized HAp by Single Step Wick-Debinding and Sintering

2015 ◽  
Vol 1113 ◽  
pp. 105-109 ◽  
Author(s):  
Nurul Huda M. Ali ◽  
Istikamah Subuki ◽  
Muhammad Hussain Ismail
Keyword(s):  
Single Phase ◽  
Sintering Temperature ◽  
Single Step ◽  
Alumina Powder ◽  
Sintering Process ◽  
Capillary Suction ◽  
Astm Standard ◽  
Injection Molded

The present study was conducted to investigate the possibility of merging the wick-debinding and sintering of injection-molded ceramic parts into a single-step operation. In this study, the synthesized hydroxyapatite (HAp) feedstock prepared was injection moulded according to ASTM standard C1424-10 to produce green specimens. The green specimens were then debound and sintered through a single step wick-debinding and sintering process by using alumina powder as an embedment agent. The principle of this method is that it carried out at a temperature where the binder is melt, allowing it to flow out of the specimens into pores in the contacting of substrate. Once, the binder is successfully removed from the specimens, sintering process is took place to bond the particle together leading to densification of sintered specimens. From the results, it shows that the binders were successfully removed from the green specimens by capillary suction of the molten binder and single phase of HAp was presented at the sintering temperature of 1000°C.

Microstructural Study of Diamond Deformed Under High Pressure and Temperature

1985 ◽  
Vol 43 ◽  
pp. 230-231
Author(s):  
E. F. Koch
Keyword(s):  
High Pressure ◽  
High Temperature ◽  
Lattice Structure ◽  
Diamond Particle ◽  
Polycrystalline Diamond ◽  
Sintering Process ◽  
Ion Milling ◽  
Sintered Compact ◽  
Transmission Electron ◽  
High Pressure Sintering

Because of the extremely rigid lattice structure of diamond, generating new dislocations or moving existing dislocations in diamond by applying mechanical stress at ambient temperature is very difficult. Analysis of portions of diamonds deformed under bending stress at elevated temperature has shown that diamond deforms plastically under suitable conditions and that its primary slip systems are on the ﹛111﹜ planes. Plastic deformation in diamond is more commonly observed during the high temperature - high pressure sintering process used to make diamond compacts. The pressure and temperature conditions in the sintering presses are sufficiently high that many diamond grains in the sintered compact show deformed microtructures.In this report commercially available polycrystalline diamond discs for rock cutting applications were analyzed to study the deformation substructures in the diamond grains using transmission electron microscopy. An individual diamond particle can be plastically deformed in a high pressure apparatus at high temperature, but it is nearly impossible to prepare such a particle for TEM observation, since any medium in which the diamond is mounted wears away faster than the diamond during ion milling and the diamond is lost.

V884: Demonstration of a Novel Single-Step Percutaneous Access Sheath for Nephrostolithotomy: A Video Presentation

2005 ◽  
Vol 173 (4S) ◽  
pp. 240-240
Author(s):  
Premal J. Desai ◽  
David A. Hadley ◽  
Lincoln J. Maynes ◽  
D. Duane Baldwin
Keyword(s):  
Single Step ◽  
Video Presentation ◽  
Percutaneous Access ◽  
Access Sheath

Effect of Lipoprotein(a) and LDL on Plasminogen Binding to Extracellular Matrix and on Matrix-dependent Plasminogen Activation by Tissue Plasminogen Activator

1996 ◽  
Vol 75 (03) ◽  
pp. 497-502 ◽  
Author(s):  
Hadewijch L M Pekelharing ◽  
Henne A Kleinveld ◽  
Pieter F C.C.M Duif ◽  
Bonno N Bouma ◽  
Herman J M van Rijn
Keyword(s):  
Extracellular Matrix ◽  
Endothelial Cells ◽  
Plasminogen Activator ◽  
Binding Sites ◽  
Umbilical Vein ◽  
Single Step ◽  
Plasminogen Activation ◽  
Structural Homology ◽  
Tissue Plasminogen ◽  
Umbilical Vein Endothelial Cells

SummaryLp(a) is an LDL-like lipoprotein plus an additional apolipoprotein apo(a). Based on the structural homology of apo(a) with plasminogen, it is hypothesized that Lp(a) interferes with fibrinolysis. Extracellular matrix (ECM) produced by human umbilical vein endothelial cells was used to study the effect of Lp(a) and LDL on plasminogen binding and activation. Both lipoproteins were isolated from the same plasma in a single step. Plasminogen bound to ECM via its lysine binding sites. Lp(a) as well as LDL were capable of competing with plasminogen binding. The degree of inhibition was dependent on the lipoprotein donor as well as the ECM donor. When Lp(a) and LDL obtained from one donor were compared, Lp(a) was always a much more potent competitor. The effect of both lipoproteins on plasminogen binding was reflected in their effect on plasminogen activation. It is speculated that Lp(a) interacts with ECM via its LDL-like lipoprotein moiety as well as via its apo(a) moiety.

Purification of Urokinase from Complex Mixtures Using Immobilized Monoclonal Antibody Against Urokinase Light Chain

1983 ◽  
Vol 49 (01) ◽  
pp. 024-027 ◽  
Author(s):  
David Vetterlein ◽  
Gary J Calton
Keyword(s):  
Monoclonal Antibody ◽  
Light Chain ◽  
Culture Media ◽  
Biological Fluids ◽  
Single Step ◽  
High Yield ◽  
Step Method ◽  
Commercial Preparation ◽  
E Coli ◽  
Tissue Culture Media

SummaryThe preparation of a monoclonal antibody (MAB) against high molecular weight (HMW) urokinase light chain (20,000 Mr) is described. This MAB was immobilized and the resulting immunosorbent was used to isolate urokinase starting with an impure commercial preparation, fresh urine, spent tissue culture media, or E. coli broth without preliminary dialysis or concentration steps. Monospecific antibodies appear to provide a rapid single step method of purifying urokinase, in high yield, from a variety of biological fluids.

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