A high temperature nano/micro vapor phase conformal coating for electronics applications

2015 ◽  
Vol 2015 (HiTEN) ◽  
pp. 000083-000090 ◽  
Author(s):  
Rakesh Kumar
Keyword(s):  
High Temperature ◽  
Vapor Phase ◽  
Polymer Coating ◽  
Electronic Devices ◽  
Chemical Corrosion ◽  
Conformal Coating ◽  
Cell Components ◽  
Commercial Applications ◽  
Temperature Exposure

Through characterization of dielectric and other properties at high temperatures, this work describes the development of a high temperature and UV stable nano/micro vapor phase deposited polymer coating for providing electrical insulation and protection of various electronics from chemical corrosion and other harsh environmental effects. Packaging, protection and reliability of various electronic devices and components, including PCBs, MEMS, optoelectronic devices, fuel cell components and nanoelectronic parts, are becoming more challenging due to the long-term performance requirements on devices. A recently commercialized high temperature polymer, Parylene HT®, offers solutions to many existing protective, packaging and reliability issues of electronic and medical applications, in part because of its excellent electrical and mechanical properties, chemical inertness and long-term thermal stability (high temperature exposure to over 350°C, short-term at 450 °C). Experimental results and commercial applications demonstrate the ability of Parylene HT coating to meet the growing requirements for higher dielectric capabilities, higher temperature integrity and mechanical processing, etc. of dynamic electronics applications. In addition, Parylene HT polymer coating truly conforms to parts due to its molecular level deposition characteristics. Its suitability and biocompatibility encourage researchers to explore Parylene HT's role in sensors and in active electronic devices for various industries.

A High Temperature and UV Stable Vapor Phase Polymer for Electronics Applications

2011 ◽  
Vol 2011 (HITEN) ◽  
pp. 000207-000214
Author(s):  
Rakesh Kumar
Keyword(s):  
High Temperature ◽  
Electronic Devices ◽  
Electronics Industry ◽  
Performance Requirements ◽  
Cell Components ◽  
Temperature Exposure ◽  
Electronic Parts ◽  
Long Term Performance ◽  
Term Performance

A recent development in the area of high temperature and UV stable polymers, which offers solutions to many existing packaging and reliability challenges of electronics industry, is described. Packaging, protection and reliability of various electronic devices and component, including PCB's, MEMS, optoelectronic devices, fuel cell components and nano-electronic parts are, becoming more challenging due to their long-term performance requirements. This high temperature polymer, named Parylene HT, offers solutions to many existing protective, packaging and reliability issues in the electronics and medical industries, in part because of its excellent electrical and mechanical properties, chemical inertness and long-term thermal stability at high temperature exposure (up to 350°C long-term and short-term at 450 °C). Experimental results and trial runs demonstrate the ability of Parylene HT coating to meet the growing requirements of higher dielectric capabilities, higher temperature integrity, mechanical processing, etc. of a dynamic electronics industry. In addition, Parylene HT polymer coating truly conforms to parts due to its molecular level deposition characteristics. Its suitability and biocompatibility encourage researchers to explore Parylene HT's role in sensors and in active electronic devices for various industries.

Parylene HT®: A High Temperature Vapor Phase Polymer for Electronics Applications

2010 ◽  
Vol 2010 (HITEC) ◽  
pp. 000108-000113
Author(s):  
Rakesh Kumar
Keyword(s):  
High Temperature ◽  
Electronic Devices ◽  
Electronics Industry ◽  
Performance Requirements ◽  
Cell Components ◽  
Temperature Exposure ◽  
Electronic Parts ◽  
Long Term Performance ◽  
Term Performance

A development in the area of high temperature polymers, which offers solutions to many existing packaging and reliability challenges of electronics industry, is described. Packaging, protection and reliability of various electronic devices and components that include PCB's, MEM's, optoelectronic devices, fuel cell components and nano-electronic parts are becoming more challenging due to their long-term performance requirements. Parylene HT offers solutions to many existing packaging and reliability issues of electronics industry in part because of its excellent electrical & mechanical properties, chemical inertness and long-term thermal stability at high temperature exposure to over 350°C (short-term at 450 °C). Experimental results and trial runs demonstrate the ability of Parylene HT coating to meet the growing requirements of higher dielectric capabilities, higher temperature integrity and mechanical processing etc. of dynamic electronic industry. In addition, Parylene HT polymer coating truly conforms to the parts due to its molecular level deposition characteristics. Its suitability and biocompatibilty encourage researchers to explore Parylene HT's role in sensors and in active electronic devices for various industries, which include enhancing high temperature application/technologies.

scholarly journals Method for the Accelerated Testing of the Durability of a Construction Binder using the Arrhenius Approach

2016 ◽  
Vol 24 (1) ◽  
pp. 24-33 ◽  
Author(s):  
Marcela Fridrichová ◽  
Karel Dvořák ◽  
Dominik Gazdič
Keyword(s):  
Compressive Strength ◽  
High Temperature ◽  
Time Budget ◽  
Test Subject ◽  
Fluidised Bed ◽  
Good Correspondence ◽  
Chemical Corrosion ◽  
Chemical Reaction Kinetics ◽  
X Ray

AbstractThe single most reliable indicator of a material’s durability is its performance in long-term tests, which cannot always be carried out due to a limited time budget. The second option is to perform some kind of accelerated durability tests. The aim of the work described in this article was to develop a method for the accelerated durability testing of binders. It was decided that the Arrhenius equation approach and the theory of chemical reaction kinetics would be applied in this case. The degradation process has been simplified to a single quantifiable parameter, which became compressive strength. A model hydraulic binder based on fluidised bed combustion ash (FBC ash) was chosen as the test subject for the development of the method. The model binder and its hydration products were tested by high-temperature X-ray diffraction analysis. The main hydration product of this binder was ettringite. Due to the thermodynamic instability of this mineral, it was possible to verify the proposed method via long term testing. In order to accelerate the chemical reactions in the binder, four combinations of two temperatures (65 and 85°C) and two different relative humidities (14 and 100%) were used. The upper temperature limit was chosen because of the results of the high-temperature x-ray testing of the ettringite’s decomposition. The calculation formulae for the accelerated durability tests were derived on the basis of data regarding the decrease in compressive strength under the conditions imposed by the four above-mentioned combinations. The mineralogical composition of the binder after degradation was also described. The final degradation product was gypsum under dry conditions and monosulphate under wet conditions. The validity of the method and formula was subsequently verified by means of long-term testing. A very good correspondence between the calculated and real values was achieved. The deviation of these values did not exceed 5 %. The designed and verified method does not also consider the influence of other effects, for instance, chemical corrosion or corrosion caused by frost-thaw cycles. However, this method could be a supplementary tool applicable to the study of degradation processes and the estimation of a binder´s durability as well.

The mechanisms of scale and subsurface diffusion zone formation of heat-resistant HP40NbTi alloy at long-term high-temperature exposure

Materialia ◽  
2019 ◽  
Vol 7 ◽  
pp. 100427
Author(s):  
Sergey Yu. Kondrat'ev ◽  
Grigoriy P. Anastasiadi ◽  
Alina V. Ptashnik ◽  
Sergey N. Petrov
Keyword(s):  
High Temperature ◽  
Diffusion Zone ◽  
Zone Formation ◽  
High Temperature Exposure ◽  
Heat Resistant ◽  
Temperature Exposure

Long Term Degradation Behavior of Impact Properties of Hydraulic Forged Superalloy 718 during Exposure at High Temperature

2007 ◽  
Vol 26-28 ◽  
pp. 1071-1074
Author(s):  
Young Seok Song ◽  
M.R. Lee ◽  
Jeong Tae Kim
Keyword(s):  
High Temperature ◽  
Impact Energy ◽  
Melting Process ◽  
Hydraulic Press ◽  
Degradation Behavior ◽  
Impact Properties ◽  
Hardness Tests ◽  
Temperature Exposure ◽  
The Impact

To check long term degradation behavior of hydraulic forged superalloy 718 during exposure at high temperature, an Alloy 718 ingot with a diameter of 400mm was manufactured by the vacuum melting process, VIM followed by VAR. The ingot was broken down for uniform microstructure and mechanical properties by a controlled cogging process using a hydraulic press. To investigate long term degradation behavior of impact properties and hardness, the specimens were exposed to 600oC, 650oC and 700oC for holding times up to 12,112 hours. Impact energy absorption tests were performed at room temperature. The fractured area and the microstructure of the impact specimens were observed by OEM and SEM and Brinell hardness tests were also performed. The changes of impact energy and hardness are remarkably different for each temperature condition. The results suggest that the impact properties and hardness of Ni based superalloy 718 is strongly related to temperature and time during high temperature exposure.

Mechanical properties and phases evolution in T91 steel during long-term high-temperature exposure

2020 ◽  
Vol 111 ◽  
pp. 104451 ◽  
Author(s):  
Yuyang Li ◽  
Jinfeng Du ◽  
Linping Li ◽  
Kewei Gao ◽  
Xiaolu Pang ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
High Temperature ◽  
High Temperature Exposure ◽  
Temperature Exposure
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