Characterization of Thick Film Technology for 300°C Packaging

2010 ◽  
Vol 2010 (HITEC) ◽  
pp. 000097-000107 ◽  
Author(s):  
Rui Zhang ◽  
R. Wayne Johnson ◽  
Vinayak Tilak ◽  
Tan Zhang ◽  
David Shaddock
Keyword(s):  
Thick Film ◽  
Analog Circuits ◽  
Passive Components ◽  
Term Operation ◽  
C Storage ◽  
Selection Of ◽  
Device Technology ◽  
Thick Film Technology

Geothermal well logging and instrumentation applications require electronics capable of 300°C operation. SiC device technology enables the design and fabrication of analog circuits that can operate at these temperatures. However, to build functional circuits, an interconnection and packaging technology must be demonstrated to provide interconnectivity between different SiC devices and passive components. For long-term operation, organic based packaging is limited to ∼250°C with careful selection of materials. Thick film technology based on ceramics and metals has potential for higher operating temperatures. In this work the effect of 300°C storage on the adhesion of different thick film Au conductors and a multilayer dielectric have been studied. In addition, the electrical properties of the dielectric have been studied as a function of temperature and of high temperature aging. Assembly technologies: component attach, wire bonding and external lead attach have also been investigated and the results are reported.

Characterization of LTCC-Thick Film Technology for 300°C Packaging

2011 ◽  
Vol 2011 (HITEN) ◽  
pp. 000046-000051 ◽  
Author(s):  
Tan Zhang ◽  
David Shaddock ◽  
Alexey Vert ◽  
Rui Zhang ◽  
R. Wayne Johnson
Keyword(s):  
Thick Film ◽  
Reservoir Characterization ◽  
Temperature Cycling ◽  
Potential Candidate ◽  
Term Operation ◽  
Die Attach ◽  
Functional Analog ◽  
Thick Film Technology

Economic geothermal well construction and reservoir characterization requires high temperature logging tools and sensors with the long-term operation capability of 300°C. Low temperature co-fired ceramic (LTCC) and thick film technology make them a potential candidate for building interconnects to SiC device and functional analog or digital circuits to operate at that temperature. In this work, single conductor layer LTCC substrates have been fabricated to characterize the thick film Au adhesion under 300°C aging. Via reliability has been evaluated on the multi-layer LTCC substrates under temperature cycling of 35–325°C. In addition, die attach, wire bonding and stud bumping assembly techniques has been investigated.

scholarly journals Production of Synseed for Hybrid Cymbidium Using Protocorm-Like Bodies

2012 ◽  
Vol 20 (2) ◽  
pp. 135-146 ◽  
Author(s):  
Jaime A. Teixeira da Silva
Keyword(s):  
Coconut Water ◽  
Control Treatment ◽  
Synthetic Seed ◽  
Naphthaleneacetic Acid ◽  
Short Term ◽  
C Storage ◽  
Cell Layers ◽  
Dark Culture ◽  
Selection Of

Abstract Synthetic seed were produced from protocorm-like bodies (PLBs) of hybrid Cymbidium Twilight Moon ‘Day Light’ after culture on a new medium, Teixeira Cymbidium (TC) medium. This new medium contained, in addition to a unique selection of macro- and micronutrients, 0.1 mg/l α-naphthaleneacetic acid and 0.1 mg/l kinetin, 2 g/l tryptone and 20 g/l sucrose, and was solidified with 8 g/l Bacto agar. Several explant types and sizes (intact PLBs, half-PLBs, PLB longitudinal thin cell layers) were tested. In addition, pretreatment of PLB-synseeds with 200 mM KNO3 solution, the addition of activated charcoal or coconut water to synseeds, light vs dark culture, short-term (1 month) and long-term (6 and 12 months) low-temperature (4°C) storage, as well as cryostorage were also tested. All treatments resulted in less PLBs than the control treatment. Among all these treatments, only the use of TC medium or incorporation of coconut water into synseeds resulted in “germination” while lowtemperature storage (1-6 months) was only possible under liquid TC. These results would allow for the short-term preservation of Cymbidium germplasm but not for effective cryopreservation.

Serviceability Characterization of Composite Storage Tanks

2007 ◽  
Author(s):  
Vladimir M. Shkolnikov
Keyword(s):  
Structural Design ◽  
Design Procedure ◽  
Fatigue Properties ◽  
Storage Tanks ◽  
Safety Factors ◽  
Analytical Technique ◽  
Term Operation ◽  
Temperature Exposure

This paper outlines an analytical technique enabling serviceability characterization of a storage tank made of a Polymer Matrix Composite (PMC) with regards to a specified profile of long-term operation of the tank. The technique combines force-temperature exposure (conceivably changing over a tank’s service life) and fatigue properties of a composite utilized within the tank structure. Along with a serviceability assessment, the technique is capable of providing a well-grounded specification of design knock-downs and safety factors relevant to the conventional structural design procedure.

scholarly journals Electrochemical and physical characterization of Ni-Cu-Fe alloy for chlor-alkali hydrogen cathodes

2003 ◽  
Vol 28 (2) ◽  
pp. 21-28 ◽  
Author(s):  
M. J. Giz ◽  
M. C. Marengo ◽  
E. A. Ticianelli ◽  
E. R. Gonzalez
Keyword(s):  
Low Ph ◽  
Physical Characterization ◽  
Energy Dispersive Analysis ◽  
Positive Aspect ◽  
X Ray ◽  
Term Operation ◽  
Different Temperatures ◽  
X Ray Absorption

This work describes the development of an alternative acetate bath for the electrochemical codeposition of Ni-Cu-Fe electrodes at low pH that is stable for several weeks and produces electrodes with good performance for chlor-alkali electrolysis. Physical characterization of the electrode surface was made using X ray absorption spectroscopy (XAS), scanning electron microscopy (SEM) and energy dispersive analysis (EDX). The evaluation of the material as electrocatalyst for the hydrogen evolution reaction (her) was carried out in brine solution (160 g L-1 NaCl + 150 g L-1 NaOH) at different temperatures through steady-state polarization curves. The Ni-Cu-Fe electrodes obtained with this bath have shown low overpotentials for the her, around 0.150 V at 353 K, and good stability under continuous long-term operation for 260 hours. One positive aspect of this cathode is that the polarization behavior of the material shows only one Tafel slope over the temperature range of 298 - 353 K.

Experimental characterization of thermoelectric properties of thick film composites

2006 ◽  
Vol 3 (2) ◽  
pp. 95-99 ◽  
Author(s):  
Piotr Markowski ◽  
Andrzej Dziedzic
Keyword(s):  
Thick Film ◽  
Thermoelectric Properties ◽  
Electrical Power ◽  
Internal Resistance ◽  
Ageing Processes ◽  
Reference Track ◽  
Potential Use ◽  
Film Composites

This paper presents thermoelectric properties of thick-film composites in relation to their potential use as power microgenerators. Several different combinations of composites were used to create thermopiles. One track of each thermocouple was made of PdAg or Pt and was the reference track and the second one of the tested material. After preliminary tests five composites with low resistance and adequate Seebeck coefficient were chosen (Ag, Ag+RuO2 and three kinds of RuO2). We measured the Thermoelectric Force, ET = f(T) and internal resistance Ri = f(T) characteristics over the temperature range 293 to 493 K. PdAg/Ag thermocouples have nearly two orders of magnitude higher output electrical power than the others. The change in values of electrical parameters of thermopiles after long-term ageing processes was also investigated.

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