研究石墨基复合材料的导热性研究
Vladimir A Shulyak1, Nikolai S Morozov1, Roman A Minushkin1
1Department of Chemistry, Lomonosov Moscow State University, Moscow 119991, Russia.
Materials (Basel, Switzerland)
|January 25, 2025
概括
一种新方法准确地测量了,铜和石墨等高性能导体的导热率. 该技术涉及创建复合材料以可靠地评估柔性石墨薄膜的导热性.
科学领域:
- 材料科学 材料科学 材料科学
- 热力工程是热力工程中的一个.
- 计量学 计量学 计量学
背景情况:
- 对先进材料来说,精确测量导热率至关重要.
- 柔性石墨薄膜在导热性评估方面提出了独特的挑战.
- 现有的方法可能不适合薄,柔性材料.
研究的目的:
- 开发和验证一种用于测量高效热导体中的导热率的新方法.
- 为了解决与测量薄型柔性石墨薄的导热率相关的计量挑战.
- 建立一种可靠的技术来表征复合材料的热性能.
主要方法:
- 在纯和铜样本上测试拟议的测量方法.
- 使用人工和天然石墨作为参考碳材料.
- 通过将薄型石墨板叠加在聚乙烯薄膜上以进行测量来开发复合材料.
- 使用计算机建模来验证复合材料方法.
主要成果:
- 测量到的 (<λAl> = 243 ± 3 W/m·K) 和铜 (<λCu> = 405 ± 4 W/m·K) 的导热率与文献中的值一致.
- 人造石墨 (<λG1> = 87 ± 1 W/m·K) 和天然石墨 (<λG2> = 145 ± 3 W/m·K) 的确定的导热率.
- 柔性石墨薄膜的复合材料方法产生了<λGF> = 184 ± 6 W/m·K的导热率,与激光闪光方法测量结果一致.
结论:
- 提出的方法对于测量高性能导体的导热率是有效的.
- 复合材料策略为测量柔性石墨的导热率提供了一个可行的解决方案.
- 开发的技术为具有挑战性的材料提供了准确可靠的热性质表征.
关键词:
里埃定律 里埃定律合金合金的使用情况.人工石墨石是人工石墨的一种形式.铜铜 铜铜的铜.有限元素方法的有限元素方法.灵活的石墨烯片是一种灵活的石墨烯片.热量流动的热量流动.天然石墨是天然的石墨.导热系数的热导电性系数更多相关视频
09:23Author Spotlight: Advancing Energy Solutions Using Nanocomposites as Processed Thermoelectric Materials
Published on: May 17, 2024
1.5K
06:26Experimental Implementation of a New Composite Fabrication Method: Exposing Bare Fibers on the Composite Surface by the Soft Layer Method
Published on: October 6, 2017
8.3K
相关概念视频
Resistivity
3.4K
When a voltage is applied to a conductor, an electrical field is generated, and charges in the conductor feel the force due to the electrical field. The current density that results depends on the electrical field and the properties of the material. In some materials, including metals at a given temperature, the current density is approximately proportional to the electrical field. In these cases, the current density can be modeled as:
3.4K
Network Covalent Solids
13.3K
Network covalent solids contain a three-dimensional network of covalently bonded atoms as found in the crystal structures of nonmetals like diamond, graphite, silicon, and some covalent compounds, such as silicon dioxide (sand) and silicon carbide (carborundum, the abrasive on sandpaper). Many minerals have networks of covalent bonds.
To break or to melt a covalent network solid, covalent bonds must be broken. Because covalent bonds are relatively strong, covalent network solids are typically...
To break or to melt a covalent network solid, covalent bonds must be broken. Because covalent bonds are relatively strong, covalent network solids are typically...
13.3K
Conduction, Convection and Radiation: Problem Solving
1.2K
There are three methods by which heat transfer can take place: conduction, convection, and radiation. Each method has unique and interesting characteristics, but all three have two things in common: they transfer heat solely because of a temperature difference; and the greater the temperature difference, the faster the heat transfer.
In order to solve a problem related to heat transfer, first of all, the situation needs to be examined to determine the type of heat transfer involved. This could...
In order to solve a problem related to heat transfer, first of all, the situation needs to be examined to determine the type of heat transfer involved. This could...
1.2K
Theory of Metallic Conduction
1.3K
The conduction of free electrons inside a conductor is best described by quantum mechanics. However, a classical model makes predictions close to the results of quantum mechanics. It is called the theory of metallic conduction.
In this theory, Newton's second law of motion is used to determine the acceleration of an electron in the presence of an applied electric field. Then, its velocity is expressed via this acceleration.
An electron moves through the crystal, containing positive ions,...
In this theory, Newton's second law of motion is used to determine the acceleration of an electron in the presence of an applied electric field. Then, its velocity is expressed via this acceleration.
An electron moves through the crystal, containing positive ions,...
1.3K
Current Density
3.8K
The total amount of current flowing through one unit value of a cross-sectional area is referred to as current density. If the current flow is uniform, the amount of current flowing through a conductor is the same at all points along the conductor, even if the conductor area varies. The current density consists of the local magnitude and direction of the charge flow, which varies from point to point. Current density is measured in amperes per meter square, and direction is defined as the net...
3.8K
Thermal expansion and Thermal stress: Problem Solving
1.1K
San Francisco's Golden Gate Bridge is exposed to temperatures ranging from -15 °C to 40 °C. At its coldest, the main span of the bridge is 1275 m long. Assuming that the bridge is made entirely of steel, what is the change in its length between these temperatures?
To solve the problem, first, identify the known and unknown quantities. The initial length (L) of the bridge is 1275 m, the coefficient of linear expansion (α) for steel is 12 x 10-6/°C, and the change in...
To solve the problem, first, identify the known and unknown quantities. The initial length (L) of the bridge is 1275 m, the coefficient of linear expansion (α) for steel is 12 x 10-6/°C, and the change in...
1.1K
