scholarly journals Poly(arylene ether nitrile) Composites with Surface-Hydroxylated Calcium Copper Titanate Particles for High-Temperature-Resistant Dielectric Applications

Polymers ◽  
2019 ◽  
Vol 11 (5) ◽  
pp. 766 ◽  
Author(s):  
Junyi Yang ◽  
Zili Tang ◽  
Hang Yin ◽  
Yan Liu ◽  
Ling Wang ◽  
...  
Keyword(s):  
High Temperature ◽  
High Performance ◽  
Temperature Stability ◽  
Dielectric Materials ◽  
Excellent Thermal Stability ◽  
Arylene Ether ◽  
Calcium Copper Titanate ◽  
Interfacial Compatibility ◽  
Surface Hydroxylation ◽  
Effective Path

In order to develop high-performance dielectric materials, poly(arylene ether nitrile)-based composites were fabricated by employing surface-hydroxylated calcium copper titanate (CCTO) particles. The results indicated that the surface hydroxylation of CCTO effectively improved the interfacial compatibility between inorganic fillers and the polymer matrix. The composites exhibit not only high glass transition temperatures and an excellent thermal stability, but also excellent flexibility and good mechanical properties, with a tensile strength over 60 MPa. Furthermore, the composites possess enhanced permittivity, relatively low loss tangent, good permittivity-frequency stability and dielectric-temperature stability under 160 °C. Therefore, it furnishes an effective path to acquire high-temperature-resistant dielectric materials for various engineering applications.

High-Temperature Dielectric Materials for Electrical Energy Storage

2018 ◽  
Vol 48 (1) ◽  
pp. 219-243 ◽  
Author(s):  
Qi Li ◽  
Fang-Zhou Yao ◽  
Yang Liu ◽  
Guangzu Zhang ◽  
Hong Wang ◽  
...  
Keyword(s):  
High Temperature ◽  
Energy Storage ◽  
Power Systems ◽  
Oil And Gas ◽  
Elevated Temperatures ◽  
Temperature Stability ◽  
Electrical Energy ◽  
Dielectric Materials ◽  
Future Research ◽  
Capacitive Energy Storage

The demand for high-temperature dielectric materials arises from numerous emerging applications such as electric vehicles, wind generators, solar converters, aerospace power conditioning, and downhole oil and gas explorations, in which the power systems and electronic devices have to operate at elevated temperatures. This article presents an overview of recent progress in the field of nanostructured dielectric materials targeted for high-temperature capacitive energy storage applications. Polymers, polymer nanocomposites, and bulk ceramics and thin films are the focus of the materials reviewed. Both commercial products and the latest research results are covered. While general design considerations are briefly discussed, emphasis is placed on material specifications oriented toward the intended high-temperature applications, such as dielectric properties, temperature stability, energy density, and charge-discharge efficiency. The advantages and shortcomings of the existing dielectric materials are identified. Challenges along with future research opportunities are highlighted at the end of this review.

High-performance, high-temperature piezoelectric BiB3O6 crystals

2015 ◽  
Vol 3 (2) ◽  
pp. 329-338 ◽  
Author(s):  
Fapeng Yu ◽  
Qingming Lu ◽  
Shujun Zhang ◽  
Hewei Wang ◽  
Xiufeng Cheng ◽  
...  
Keyword(s):  
High Temperature ◽  
High Performance ◽  
Piezoelectric Properties ◽  
Temperature Stability ◽  
Piezoelectric Sensor ◽  
High Temperature Stability ◽  
Sensor Applications

BiB3O6 crystals possess large piezoelectric coefficients and high-temperature stability of their piezoelectric properties, which is promising for piezoelectric sensor applications.

scholarly journals Micro/Mesoporous Fe3O4/Fe-Phthalocyanine Microspheres and Effects of Their Surface Morphology on the Crystallization and Properties of Poly(Arylene Ether Nitrile) Composites

Materials ◽  
2018 ◽  
Vol 11 (8) ◽  
pp. 1356 ◽  
Author(s):  
Kui Li ◽  
Dengxun Ren ◽  
Xianzhong Tang ◽  
Mingzhen Xu ◽  
Xiaobo Liu
Keyword(s):  
Electron Microscope ◽  
Surface Morphology ◽  
Composite Films ◽  
Surface Characteristics ◽  
Excellent Thermal Stability ◽  
Arylene Ether ◽  
Transmission Electron ◽  
Interfacial Compatibility ◽  
Surface Morphologies ◽  
Mesoporous Structures

The surface morphology of nanoparticles significantly affects the final properties and interfacial characteristics of their composites. Thus, investigations on the surface morphology of the nanoparticles is essential to fabricate improved nanoparticle-reinforced composites. Fe3O4/Fe-phthalocyanine (FePc) hybrid microspheres with micro/mesoporous structures were prepared via a solvothermal process and solvent etching method. The surface morphology and compositional distribution were respectively investigated using a scanning electron microscope (SEM) and a transmission electron microscope (TEM) to rule out that FePc monomers have been blended with Fe3O4 to form Fe3O4/FePc hybrid microspheres without serious agglomeration. The surface roughness of Fe3O4/FePc microspheres was investigated by the scanning probe microscope (SPM), and confirmed by the adsorption and desorption isotherms of N2. The effects of the various surface morphologies on the crystallization behavior of crystallizable poly(arylene ether nitrile) (c-PEN) were first employed to confirm the surface characteristics of the resulted microspheres. Results indicated that the etched Fe3O4/FePc microspheres would improve the crystallization degree of c-PEN, due to their much more micro/mesoporous structures than that of original Fe3O4/FePc. Then, Fe3O4/FePc hybrid microspheres reinforced PEN composite films were prepared and their interfacial compatibility was monitored using an SEM. Excellent thermal stability and improved mechanical properties were obtained by combining the etched Fe3O4/FePc and PEN matrix. The excellent surface properties and micro/mesoporous structures make the novel Fe3O4/FePc an excellent candidate of organic/inorganic hybrid fillers and micro/mesoporous materials.

The Study on High Temperature Stability Test of Ni/Cr Cold Spray Coating

2020 ◽  
Vol 901 ◽  
pp. 43-48
Author(s):  
Jirasak Tharajak ◽  
Noppakun Sanpo
Keyword(s):  
High Temperature ◽  
Cold Spray ◽  
Temperature Stability ◽  
Spray Coating ◽  
Deposition Efficiency ◽  
High Temperature Stability ◽  
Excellent Thermal Stability ◽  
Spray Coatings ◽  
Stability Performance ◽  
Cold Spray Coating

Recently cold spray coating technology was used for many applications in petrochemical business especially for high temperature required section. For this reason, the applied coating must be able to withstand at least 800 °C. The developed Ni/Cr cold spray coating was studied mainly on high temperature resistant property. Ni/Cr with the ratio of 80/20 feedstock powders revealed the highest deposition efficiency and it was selected to use as optimum feedstock powder compositions for the less of experimental study. Finally, it was found that Ni/Cr cold spray coatings reveal excellent thermal stability performance after completed both corrosion and thermal shock tests.

An Electrospun Polyimide Ultrathin Fiber Membrane for Particle Filtration of Hot Gas

2014 ◽  
Vol 1048 ◽  
pp. 489-492 ◽  
Author(s):  
Jian Fei Xie
Keyword(s):  
High Temperature ◽  
High Performance ◽  
Amic Acid ◽  
Infrared Spectrometry ◽  
Fiber Membrane ◽  
Electrospun Membrane ◽  
Excellent Thermal Stability ◽  
High Performance Polymer ◽  
Thermal Imidization ◽  
Average Size

Electrospun membrane filters used to remove particles from hot gases were highly desired to meet the requirement of application in high temperature. Polyimide is a kind of high performance polymer, especially for excellent thermal stability and chemical resistance. In this paper, the polyimide precursor poly (amic acid) (PAA) was synthesized from 3,3’,4,4’-oxydiphthalic anhydride (ODPA) and 4,4’-methylenedianiline (MDA), the polyimide (PI) ultrathin fiber membrane was fabricated by electrospinning and followed by thermal imidization. Scanning electron microscope (SEM), infrared spectrometry (IR), and thermogravimetric analysis (TGA) were used for the characterizations of the polyimide ultrathin fiber Membrane, the tests show that the diameter of ultrathin fiber is uniform with an average size of around 400nm and the membrane is thermally stable at a high temperature of 500°C.

scholarly journals Applications of polyimide coatings: a review

2021 ◽  
Vol 3 (3) ◽  
Author(s):  
Ayse Sezer Hicyilmaz ◽  
Ayse Celik Bedeloglu
Keyword(s):  
High Temperature ◽  
High Performance ◽  
Temperature Stability ◽  
High Strength ◽  
Electronics Industry ◽  
High Tech ◽  
Nanofiber Membrane ◽  
High Temperature Stability ◽  
Production Methods ◽  
Polyimide Coating

AbstractPolyimides, high-performance polymers with superior properties such as high temperature stability, resistance to solvents and high strength, can be used in high-tech applications of the aerospace and aviation, medical or electronics industry in different forms (film, fiber, nanofiber, membrane, foam, adhesive or coating). Among these applications, coating has a special place and is used to develop advanced structures having high temperature resistance, flame retardancy and etc. for high tech industries via an economical and feasible way. Therefore, in this review, we aimed to report the broad application status of polyimide coatings by reviewing publications, patents and commercial products. Thus, this study can assist in selecting suitable polyimide types and production methods for polyimide coating applications and in understanding their applicability for future products.

High Temperature Stability of MGC’s Gas Turbine Components in Combustion Gas Flow Environments

2005 ◽  
Author(s):  
Narihito Nakagawa ◽  
Hideki Ohtsubo ◽  
Kohji Shibata ◽  
Atsuyuki Mitani ◽  
Kazutoshi Shimizu ◽  
...  
Keyword(s):  
Thermal Stability ◽  
High Temperature ◽  
Gas Flow ◽  
Temperature Stability ◽  
High Temperature Strength ◽  
High Temperature Stability ◽  
Exposure Test ◽  
Excellent Thermal Stability ◽  
Combustion Gas ◽  
Flow Environment

Melt growth composites (MGCs) have a unique microstructure, in which continuous networks of single-crystal phases interpenetrate without grain boundaries. Therefore, the MGCs have excellent high-temperature strength characteristics, creep resistance, oxidation resistance and thermal stability in an air atmosphere at very high temperature. In order to investigate the recession behavior of MGCs in combustion gas flow environment, we have just started the exposure tests to evaluate the influence of combustion gas flow environment on MGCs. The MGCs have about 95% of the initial flexural strengths after the exposure test for 10 hours at T = 1500 °C, P = 0.1–0.3 MPa, V = 150–250 m/s, PH2O = 15–45 kPa in the combustion gas flow environment. MGCs have excellent thermal stability and water vapor resistance in comparison with conventional ceramic materials such as Si3N4 and Al2O3 under the high temperature combustion gas flow environment.

Improvement of Thermal Stability of ZrO2-SiO2 Aerogel Modified by Ca(II) Cations

2018 ◽  
Vol 281 ◽  
pp. 105-110 ◽  
Author(s):  
Hang Yuan Zhao ◽  
Xiao Lei Li ◽  
Jian He ◽  
Zhi Peng Hu ◽  
Hui Jun Yu
Keyword(s):  
Thermal Stability ◽  
High Temperature ◽  
Calcium Nitrate ◽  
Temperature Stability ◽  
Secondary Phase ◽  
Ethanol Solution ◽  
Hydroxyl Groups ◽  
High Temperature Stability ◽  
Excellent Thermal Stability ◽  
Surface Hydroxyl

Ca (II) modified ZrO2-SiO2 aerogel (CaZSA) with excellent thermal stability at 1000 °C was prepared by aging the ZrO2-SiO2 wet gel in calcium nitrate (Ca (NO3)2) ethanol solution followed with alcohol supercritical fluid drying method. The reaction between surface hydroxyl groups on the aerogel and Ca (II) ions played an important role in reducing the high temperature activity and inhibiting the particle growth caused by the condensation of hydroxyl groups of aerogel. Moreover, tiny secondary-phase particles, Ca (II) ions, introduced along grain boundaries serve as the pinning particles to inhibit the crystallization of ZrO2-SiO2 aerogel (ZSA). Thus the high-temperature stability of ZSA was significantly improved by surface modification with Ca (II). The specific surface area of CaZSA still maintained 223 m2·g-1 after 1000 °C calcination, which was 52.7% higher than that of ZSA at the same treatment condition.

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