Abstract Composite of nanoscale Zero Valent Iron (nZVI) loaded on Biochar (BC) was prepared and characterized as hydrogen peroxide (H 2 O ) activator for the degradation trichloroethylene (TCE). nZVI is homogeneously lamellarly structured BC surfaces to form nZVI/BC with specific surface area (S BET 184.91 m g −1 , which can efficiently activate H achieve TCE efficiency 98.9% TOC removal 78.2% within 30 min under conditions 0.10 mmol L TCE, 1.13 1.50 . Test results from Electron Spin...

The electric field distributions along gas-solid interfaces determine the reliability, lifetimes and sizes of gaseous insulated switchgears/pipelines (GIS/GIL), which also affect reliability power systems. In this study, characteristics steady transient were first introduced, followed by concept functionally graded materials (FGMs). development histories FGM applied in electrical engineering related optimisation methods described detail. regulation effect fabrication technology different...

Abstract The relationship between interfacial structure and thermal conductivity in epoxy resin/Al 2 O 3 composite is important but still elusive. Here, we illuminate this issue by investigating the role of four silane coupling agents for composites. results show that 3‐glycidoxypropyltrimethoxysilane (KH560) best agent to modify Al , resulting lowest viscosity highest ‐KH560 compared with alternative systems. This attributed strong interaction resin, as confirmed Fowkes model broadband...

An experimental study was conducted to improve the electrical insulation of epoxy resin. The effects boehmite, γ-alumina and α-alumina nanoparticles on volume resistivity, dielectric strength glass transition temperature nanocomposites were investigated. results showed that displayed obvious advantages in enhancing performance nanocomposites, compared boehmite nanoparticles. direct current resistivity breakdown nanocomposite with 2.0 wt% improved 2.2 × 1018 Ω cm 76.1 kV mm−1 respectively....

In this article, aramid fiber surface is treated by dielectric barrier discharge (DBD) plasma, and various reinforced epoxy composites (AFRCs) are prepared to investigate the effects of plasma modification on mechanical properties. It found that treatment could change roughness active chemical groups content surface, which beneficial improvement interfacial bonding strength between resin. After appropriate time with 2 min Argon flow rate L/min, conductivity, loss, integration charge...

Epoxy/Al <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</inf> O xmlns:xlink="http://www.w3.org/1999/xlink">3</inf> composites are widely used as electrical insulating materials for high voltage apparatuses. Organic acid anhydrides important curing agents of epoxy composites. Functional groups and molecular structures the play significant roles in determining physical properties epoxy/Al In this work, we investigate effects methyl...

Partial discharge (PD) is an important factor leading to insulation deterioration and fault of power cables. Due large cable capacitances, supplies should provide high reactive charging currents during field tests; common PD test methods frequency (PF) voltage or alternating current resonance (ACR) cannot meet the requirements with increase levels line lengths. At present, equivalence between PF-like (PFL) voltages, such as damped (DAC) voltage, very low-frequency sine (VLF-Sine) wave cosine...

Nickel titanium (NiTi) lattice structures prepared by laser powder bed fusion (LPBF) have great application potential, due to their unique shape memory effect, superelasticity, and controlled geometry characteristics. In this study, the NiTi I-graph-wrapped package (I-WP) body-centered cubic (BCC) structure samples were LPBF process. The uniaxial compression properties cyclic of process studied. results showed that surfaces very rough adhered with many particles. sample optimization design...

Monitoring the cable terminal's partial discharge (PD) is of great significance to ensure line's safe and stable operation. To improve anti-interference ability real-time performance detection, this paper develops a Mach-Zehnder interferometer (MZI) detection system for cross-linked polyethylene (XLPE) terminals. The optical fiber implanted into 10 kV XLPE terminal, airgap defects different volumes are set in main insulation. inside terminal serves as sensing head MZI signal arm. PD test was...

Silicone rubber (SIR) has been widely used in electrical insulation fields, and the introduction of new materials is very important for performance improvement SIR composites. In this work, four different fillers, including aluminium hydroxide (ATH), yimonite (YMT), boron nitride (BN) mica-filled composites were prepared, vulcanization behavior, mechanical properties, hydrophobicity investigated compared. Both BN- showed excellent performance, while ATH-filled composite exhibited best...

In this work, the dielectric spectroscopy and dynamic mechanical thermal of neat epoxy nanocomposites modified by boehmite, γ‐alumina α‐alumina nanoparticles, respectively, were investigated. The behavior resin was significantly affected incorporation nanofiller. values real imaginary part relative permittivity epoxy/α‐alumina nanocomposite even lower than these epoxy. On contrary, boehmite higher glass transition temperature ( T g ) determined analysis (DMA) obviously decreased when...

The bird-streamer caused failures have become one of the major causes transmission line outages. It is more common and widespread than generally believed, greatly threatens reliability lines. laboratory study such mechanism seldom reported especially for long gaps as 500 kV insulators. Presented in this paper are results air bird streamer flashover experiments conducted on 220 experimental demonstrated that surface can happen insulators, however space flashover, because will split into...

Orderly arranged Silicon carbide (SiC)/epoxy (EP) composites were fabricated. SiC was made magnetically responsive by decorating the surface with iron oxide (Fe3O4) nanoparticles. Three treatment methods, including without magnetization, pre-magnetization and curing used to prepare SiC/EP different filler distributions. Compared unmodified SiC, magnetic core-shell structure conducive improve breakdown strength of maximum enhancement rate 20.86%. Among three prepared in curing-magnetization...

Abstract Atmospheric corrosion is ubiquitous in China but varies a lot among different regions covering the cold, temperate, and tropical zones. Categorizing atmospheric corrosivity plotting precise map remain key interest for variety of industries. The present work proposed an hot-dip galvanized steels, which was constructed by inverse distance weighting (IDW) interpolation algorithm based on both measured rates coupons exposed at 2393 inland test stations calculated from prevalent...

SiC/EP composites are promising insulating materials due to their high thermal conductivity, stable chemical properties, and nonlinear electrical conductivity. However, the compatibility of micron-sized SiC particles with organic polymer matrix is poor, defects such as air gaps may be introduced at interface, which reduces partial discharge resistance composite materials. In order improve initial voltage (PDIV) composites, in this paper, different proportions were prepared by surface...

Spacer insulators are important insulating component of gas insulated switchgear(GIS). In order to analyze the influence spacer insulator materials temperature characteristics on electric performance, we tested distribution under work condition and material's relative permittivity. Then established a simulation model in finite element numerical software calculate its field. Using test results as reference verify calculation, changes field along surface insulator, permittivity have be...

Solid-state high-frequency transformers are the core components of power electronic and have become a research hotspot. The object this article is 30kHz/200kVA epoxy resin encapsulated solid-state transformer. Insulation cracking occurred during temperature shock test. Using COMSOL software simulation, results show that contact point between winding bears greater thermal stress at beginning shock, near outer surface smaller. As progresses, insulation presents extremely uneven field...

The performance of silicone rubber gel elastomers is affected by the composition and structure crosslinker. In this work, a two-component addition liquid material was developed, effects contents two methyl hydro-silicone oils on compression modulus breakdown strength insulating material, as well change after hot air aging at different times (24 h, 48 72 96 120 144 168 h), were studied. results showed that exhibited an upward trend with increase in hydrogen oil content. best achieved...