在高直流电压下对环氧纳米复合材料的电气特性
Ammar Alsoud1,2, Samer I Daradkeh1, Saleh R Al-Bashaish3
1Central European Institute of Technology, Brno University of Technology, Purkynova 656/123, 61200 Brno, Czech Republic.
Polymers
|April 13, 2024
概括
这项研究研究了环氧纳米复合材料.
科学领域:
- 材料科学 材料科学 材料科学
- 电气工程 电气工程
- 聚合物科学 聚合物科学
背景情况:
- 环氧树脂被广泛用作电绝缘体.
- 了解它们在高电压压力下的行为对于可靠的应用至关重要.
- 纳米复合材料在电气性能方面提供了潜在的改进.
研究的目的:
- 评估未填充的环氧和环氧纳米复合材料 (SiO2,MgO,Al2O3) 的直流分解特性.
- 检查高电压暴露对环氧纳米复合材料电气性能的影响.
- 评估纳米粒子类型和尺寸对环氧纳米复合材料性能和寿命的作用.
主要方法:
- 连续电流断裂强度测试.
- 在高压暴露前后进行电气性质测量 (允许性,损耗系数,导电性).
- 场电子显微镜用于电流电压表征和高电压暴露.
- 扫描电子显微镜 - - 能量分散式X射线光谱学和富里埃变换红外光谱学用于材料表征.
主要成果:
- 未填充的环氧体在高压暴露后显示结构降解和电气性能降低.
- 与未填充的环氧材料相比,环氧纳米复合材料的使用寿命显著增加.
- 与环氧/MgO和环氧/SiO2纳米复合材料相比,环氧/Al2O3纳米复合材料表现出优越的直流分解强度和介电完整性.
结论:
- 纳米粒子的添加增强了环氧树脂的高压性能和耐用性.
- 纳米颗粒的类型和大小影响了电特性和寿命的改善.
- 环氧/Al2O3纳米复合材料由于其增强的介电强度,对高压绝缘应用具有前景.
相关概念视频
01:31Dielectric Polarization in a Capacitor
4.7K
The presence of a dielectric medium in a capacitor not only changes the voltage and capacitance but also affects the electric field. In general, dielectrics can be of two types: polar and nonpolar. In a polar dielectric, the positive and negative charges in the molecules are separated by a distance and hence have a permanent dipole moment. In contrast, no such charge separation exists in a nonpolar dielectric, however the nonpolar molecules get polarized in the presence of an external electric...
4.7K
01:27Electrostatic Boundary Conditions in Dielectrics
1.2K
When an electric field passes from one homogeneous medium to another, crossing the boundary between the two mediums imparts a discontinuity in the electric field. This results in electrostatic boundary conditions that depend on the type of mediums the field propagates through.
Consider a case where both the mediums across a boundary are two different dielectric materials. Recall that the electric field and electric displacement are proportional and related through the material's...
Consider a case where both the mediums across a boundary are two different dielectric materials. Recall that the electric field and electric displacement are proportional and related through the material's...
1.2K
01:18Capacitor With A Dielectric
3.9K
Parallel plate capacitors consist of two conducting plates separated by a certain distance. However, it is mechanically difficult to hold the large plates parallel to each other without actual contact. Hence, a dielectric layer is commonly placed between the plates, which provides an easy solution for holding the plates together with a small gap and increases the capacitance of the capacitor.
Dielectrics are non-conducting materials with no free or loosely bound electrons. When a dielectric is...
Dielectrics are non-conducting materials with no free or loosely bound electrons. When a dielectric is...
3.9K
01:13Electrical Conductivity
1.1K
In perfect conductors, the electric field inside is always zero due to the abundance of free electrons, which nullify any field by flowing. As a result, any residual charge resides on the surface.
In a practical conductor, an applied electric field may be sustained, causing a flow of electrons, which produce a current. The differential form of the current, the current density, is related to the electric field.
More generally, it is related to the force per unit charge, which involves the...
In a practical conductor, an applied electric field may be sustained, causing a flow of electrons, which produce a current. The differential form of the current, the current density, is related to the electric field.
More generally, it is related to the force per unit charge, which involves the...
1.1K