High-Temperature Self-Lubricating Metal Nitride-Based Nanostructure Composite Films

2019 ◽  
Author(s):  
Hongbo Ju
Keyword(s):  
High Temperature ◽  
Composite Films ◽  
Metal Nitride

scholarly journals Engine Oil Condition Monitoring Using High Temperature Integrated Ultrasonic Transducers

2010 ◽  
Author(s):  
M. Kobayashi ◽  
Z. Sun ◽  
C.-K. Jen ◽  
K.-T. Wu ◽  
J. Bird ◽  
...  
Keyword(s):  
High Temperature ◽  
Sol Gel ◽  
Composite Films ◽  
Ultrasound Velocity ◽  
Ultrasonic Waves ◽  
Ultrasonic Transducers ◽  
Engine Oil ◽  
Piezoelectric Composite ◽  
Engine Operation ◽  
Lubricant Oil

High temperature integrated ultrasonic transducers (IUTs) made of thick piezoelectric composite films have been coated directly onto the lubricant oil supply and sump lines of a modified CF700 turbojet engine. These thick piezoelectric films are fabricated using a sol-gel spray technology. The center frequencies of these IUTs are in the range of 10 to 12 MHz. The top electrodes, electrical wires, conducting adhesive bond, connectors and cables have been tested successfully for temperatures of up to 500°C. By operating these IUT in transmission mode, the amplitude and velocity of transmitted ultrasonic waves across the flow channel of the lubricant oil in supply and sump lines were measured during engine operation. The results have shown that the strength of the ultrasonic waves is sensitive to the presence of air bubbles in the oil and that the ultrasound velocity is linearly dependent on oil temperature. Based on the sensitivity of ultrasound velocity to oil temperature, a method for real-time monitoring of engine oil degradation is proposed.

Electrodeposited copper-graphite composites for low-CTE integrated thermal structures

2016 ◽  
Vol 2016 (1) ◽  
pp. 000088-000093
Author(s):  
Shreya Dwarakanath ◽  
P. Markondeya Raj ◽  
Kaya Demir ◽  
Vanessa Smet ◽  
Venky Sundaram ◽  
...  
Keyword(s):  
High Temperature ◽  
High Power ◽  
Process Development ◽  
Coefficient Of Thermal Expansion ◽  
Composite Films ◽  
Graphite Composite ◽  
Heat Spreaders ◽  
Cte Mismatch ◽  
Graphite Composites ◽  
Modeling Of Properties

Abstract Emerging high-power and high-temperature electronic modules require thick copper structures for power-supply, thermal vias, heat-spreaders, and also as carriers or lead-frames for high-power packages. Such structures should coexist with glass and other low-CTE substrates to meet high-temperature performance, dimensional stability and superior device interconnection reliability with low stresses and warpage. The primary challenge with these packages arises from the coefficient of thermal expansion (CTE) mismatch between the conductors and the substrates. Cu-graphite composites with glass-matched CTE are explored to address this challenge through analytical modeling of properties such as CTE, Young's modulus and thermal conductivity, FEM predictions of glass warpage and stresses, process development to deposit copper-graphite composite films with high graphite loading of 64 vol. %, and warpage measurements using shadow-moiré. Results indicate that Cu-graphite composites can mitigate the warpage and stress issues in high-temperature and high-power packages.

High-Temperature Hardness of Multilayer Vacuum-Arc Metal–Metal Nitride Coatings

2021 ◽  
Vol 43 (3) ◽  
pp. 198-202
Author(s):  
V. F. Gorban’ ◽  
A. O. Andreev ◽  
V. A. Stolbovoi ◽  
S. A. Firstov ◽  
V. K. Shkolniy
Keyword(s):  
High Temperature ◽  
Vacuum Arc ◽  
Metal Nitride ◽  
Metal Metal ◽  
Nitride Coatings

Fabrication of polyimide composite films based on carbon black for high-temperature resistance

2014 ◽  
Vol 35 (11) ◽  
pp. 2214-2220 ◽  
Author(s):  
Jinuk Kwon ◽  
Jinyoung Kim ◽  
Jeeeun Lee ◽  
Patrick Han ◽  
Dongmyung Park ◽  
...  
Keyword(s):  
High Temperature ◽  
Carbon Black ◽  
Composite Films ◽  
Temperature Resistance ◽  
High Temperature Resistance

Enhancement of thermal stability and energy storage capability of flexible Ag nanodot/polyimide nanocomposite films via in situ synthesis

2020 ◽  
Vol 8 (36) ◽  
pp. 12607-12614 ◽  
Author(s):  
Shuang Xing ◽  
Zhongbin Pan ◽  
Xiaofeng Wu ◽  
Hanxi Chen ◽  
Xujiao Lv ◽  
...  
Keyword(s):  
Thermal Stability ◽  
High Temperature ◽  
Filler Content ◽  
Composite Films ◽  
In Situ Synthesis ◽  
Nanocomposite Films ◽  
Discharge Energy ◽  
Polyimide Nanocomposite ◽  
Discharge Energy Density

Composite films with an ultralow filler content of 0.1 vol% Ag-NDs exhibit an excellent high-temperature discharge energy density of 2.56 J cm−3, together with efficiency exceeding 80% at a temperature of 150 °C.

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