Microscopic Characterization of Cosintered Copper/Cordierite Interfaces

1989 ◽  
Vol 153 ◽  
Author(s):  
J. Werckmann ◽  
B.S. Han ◽  
J. Faerber ◽  
P. Humbert ◽  
B. Carriere ◽  
...  
Keyword(s):  
Sol Gel ◽  
Copper Compound ◽  
Heating Rates ◽  
Good Adhesion ◽  
Adhesion Properties ◽  
Microscopic Scale ◽  
Structural Modifications ◽  
High Heating ◽  
Bonding Technique

AbstractCopper and sol-gel processed cordierite were cosintered in oxidizing atmosphere using an eutectic bonding technique. Firing at low and high heating rates leads to interfaces which present different macroscopic properties. These interfaces were therefore investigated on a microscopic scale by SEM, XPS and STEM analyses. Copper diffusion as well as strong chemical and structural modifications were observed in the interface region. Although these interfaces have good adhesion properties, there was no evidence for the formation of some interfacial copper compound.

Sol–Gel-Derived 0–3 Composite Materials for Direct Write Electronics Applications

2000 ◽  
Vol 624 ◽  
Author(s):  
Steven M. Coleman ◽  
Robert L. Parkhill ◽  
Robert M. Taylor ◽  
Edward T. Knobbe
Keyword(s):  
Sol Gel ◽  
Electrical Characterization ◽  
Metal Alkoxides ◽  
Direct Write ◽  
Composite Ceramics ◽  
Good Adhesion ◽  
Structural Density ◽  
Tan Δ ◽  
Deposited Films

ABSTRACTThe use of sol–gel-derived 0–3 composite ceramics for low-temperature direct-write electronics applications was investigated. The 0–3 composite paste materials were prepared using selected metal alkoxides and commercial low- and high-κ' dielectric powders. The composite pastes were deposited onto alumina and polyimide substrates using conventional screening and micro-dispensing techniques. The deposited films were oven-dried at or below 200°C and thermally densified using a CO2 laser. The 0–3 composites exhibited good adhesion and structural density. Electrical characterization of the laser-processed dielectrics revealed κ' values as high as 295 and tan δ as low as 0.02 on polyimide substrates.

Analytical Characterization and Corrosion Behavior of Non-Functional Bis-Silane Pre-Treated Carbon Steel Substrates

2009 ◽  
Vol 79-82 ◽  
pp. 1091-1094
Author(s):  
Hai Ying Zhu ◽  
Yan Chen ◽  
Yun Ping Liu ◽  
Wei Wei Sun ◽  
Shou Gang Chen
Keyword(s):  
Carbon Steel ◽  
Corrosion Behavior ◽  
Electrochemical Impedance ◽  
Good Adhesion ◽  
Adhesion Properties ◽  
Analytical Characterization ◽  
Treated Carbon ◽  
Steel Substrates ◽  
Scanning Electron

The present work aims at studying the corrosion resistance of carbon steel substrates pre-treated with bis-[triethoxysilylpropyl] tetrasulfide (BTESPT) solutions. The corrosion behavior of the pre-treated substrates during immersion in seawater was assessed by electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization. The analytical characterization of the silane films was performed by scanning electron microscopy (SEM). The results show that the pre-treatments based on silanes provide good corrosion protection of carbon steel substrates and the bis-silane film has good adhesion properties.

scholarly journals Synthesis and characterization of sol-gel derived monophasic mullite powder

Cerâmica ◽  
2020 ◽  
Vol 66 (379) ◽  
pp. 307-313
Author(s):  
A. Jana ◽  
D. Ray
Keyword(s):  
Sol Gel ◽  
Grain Morphology ◽  
Precursor Powder ◽  
Bet Surface Area ◽  
X Ray Diffraction ◽  
Heating Rates ◽  
X Ray ◽  
Heat Treated ◽  
Different Temperatures

Abstract High-purity microfine mullite precursor powder of stoichiometric chemical composition, 3Al2O3.2SiO2, was synthesized through the sol-gel route using aluminum isopropoxide and tetraethyl orthosilicate. The derived mullite precursor powder was characterized by BET surface area, particle size distribution, Fourier-transform infrared spectroscopy, thermogravimetry-differential thermal analysis (TG-DTA), X-ray diffraction (XRD), scanning electron microscopy (SEM), and energy-dispersive X-ray spectroscopy. Phase analysis of the precursor powder and calcined samples at different temperatures was done by XRD. Non-isothermal crystallization kinetics of mullite precursor was studied by TG-DTA in static air using heating rates of 5.0, 7.5, 10.0, 12.5, and 15 K.min-1. Grain morphology was studied by SEM. The results showed that synthesized mullite precursor powder possessed homogeneity of Al and Si components, and the amorphous precursor powder was converted to monophasic mullite crystal when heat-treated at 970 °C. Based on Flynn-Wall-Ozawa and Kissinger equations, the activation energy associated with the crystallization of mullite was determined to be 1189.8 and 1189.0 kJ.mol-1, respectively.

Transparent Film Heaters based on Silver Nanowire Random Networks

2012 ◽  
Vol 1449 ◽  
Author(s):  
Jean-Pierre Simonato ◽  
Caroline Celle ◽  
Celine Mayousse ◽  
Alexandre Carella ◽  
Henda Basti ◽  
...  
Keyword(s):  
Silver Nanowires ◽  
Silver Nanowire ◽  
Random Networks ◽  
Transparent Film ◽  
Heating Rates ◽  
Large Area ◽  
High Heating ◽  
Fabrication And Characterization ◽  
Printing Techniques

ABSTRACTWe present the fabrication and characterization of transparent thin film heaters (TTFHs) based on silver nanowires. The goal is to develop a simple process for the production of transparent heating elements by large area printing techniques. The TTFHs are based on recently developed random networks of silver nanowires. Thanks to the very low sheet resistance achievable with silver nanowires, we show that it is possible to obtain high heating rates and good steady state temperatures at low voltages, typically below 12 V.

Design and Characterization of an Entrained Flow Reactor for the Study of Biomass Pyrolysis Chemistry at High Heating Rates

2001 ◽  
Vol 15 (5) ◽  
pp. 1276-1285 ◽  
Author(s):  
Alexander L. Brown ◽  
David C. Dayton ◽  
Mark R. Nimlos ◽  
John W. Daily
Keyword(s):  
Flow Reactor ◽  
Biomass Pyrolysis ◽  
Heating Rates ◽  
Entrained Flow ◽  
High Heating ◽  
Entrained Flow Reactor

The characterization of coal at high heating rates

Fuel ◽  
1989 ◽  
Vol 68 (2) ◽  
pp. 267-269
Author(s):  
D.G. Richards ◽  
B.J. Stokes
Keyword(s):  
Heating Rates ◽  
High Heating

Comparing fast inductive tempering and conventional tempering: Effects on microstructure and mechanical properties

2018 ◽  
Vol 115 (4) ◽  
pp. 407 ◽  
Author(s):  
Annika Eggbauer Vieweg ◽  
Gerald Ressel ◽  
Peter Raninger ◽  
Petri Prevedel ◽  
Stefan Marsoner ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Impact Energy ◽  
Charpy Impact ◽  
Heat Treating ◽  
Processing Route ◽  
High Heating Rate ◽  
Heating Rates ◽  
High Heating ◽  
Tempering Treatment ◽  
Carbide Distribution

Induction heating processes are of rising interest within the heat treating industry. Using inductive tempering, a lot of production time can be saved compared to a conventional tempering treatment. However, it is not completely understood how fast inductive processes influence the quenched and tempered microstructure and the corresponding mechanical properties. The aim of this work is to highlight differences between inductive and conventional tempering processes and to suggest a possible processing route which results in optimized microstructures, as well as desirable mechanical properties. Therefore, the present work evaluates the influencing factors of high heating rates to tempering temperatures on the microstructure as well as hardness and Charpy impact energy. To this end, after quenching a 50CrMo4 steel three different induction tempering processes are carried out and the resulting properties are subsequently compared to a conventional tempering process. The results indicate that notch impact energy raises with increasing heating rates to tempering when realizing the same hardness of the samples. The positive effect of high heating rate on toughness is traced back to smaller carbide sizes, as well as smaller carbide spacing and more uniform carbide distribution over the sample.

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