In modern electronic devices, the application of conductive materials has become increasingly common. Conductive silicone rubber sheets are one of the important and widely used materials. So, what is the principle of conductive silicone rubber sheets? This article will provide a detailed analysis.
Conductive silicone rubber sheets are materials that achieve conductive performance by evenly distributing conductive particles in silicone rubber. These conductive particles can be silver-coated glass, silver-coated aluminum, or pure silver, etc. They are uniformly mixed into the silicone rubber and, through pressure, the conductive particles come into contact with each other, forming a good conductive path. This structure not only ensures the flexibility and elasticity of the material but also endows it with excellent conductive properties.
Specifically, the conductive principle of conductive silicone rubber sheets mainly involves two aspects: chain-like conductive pathways and tunneling effect.
The chain-like conductive pathway, also known as percolation theory, holds that the filler particles must be within a few tenths of a nanometer of each other to form a continuous chain-like structure, enabling effective current conduction. In this mode, the conductive particles are connected like chains, forming a path that can effectively transmit current.
Another conductive mechanism is the tunneling effect. When the distance between conductive particles is too far to form direct contact, electrons can jump across the gap through the “tunneling effect” in quantum mechanics, thus achieving conduction. This phenomenon is particularly important at the microscopic scale because it allows the material to maintain a certain level of conductivity even when the particle spacing is large.
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In addition to the above two main conductive mechanisms, conductive silicone rubber sheets also have excellent sealing performance.
This enables them to effectively prevent the intrusion of moisture, dust, and other harmful substances in electronic devices, thereby protecting internal components from damage. For example, in devices such as mobile phones, tablets, TVs, and audio equipment, conductive silicone rubber sheets are often used for connections between circuit boards to ensure stable signal and power transmission.
The production of conductive silicone rubber sheets involves several key steps.
First, a suitable silicone rubber base material is selected and uniformly mixed with conductive fillers (such as carbon black or metal powder).
Then, crosslinking agents and additives are added, and through compression and curing processes, the mixture is formed into the desired silicone rubber sheet.
Throughout this process, it is crucial to control the ratio of fillers to silicone rubber and the selection and dosage of crosslinking agents, as these directly affect the final product’s conductivity and mechanical strength.
Compared with traditional metal materials, conductive silicone rubber sheets have better flexibility and wear resistance, allowing them to work stably in various complex environments. These characteristics make them an indispensable material in the electronics industry. Whether used in the manufacture of conductive connectors, circuit boards, or sensors, conductive silicone rubber sheets demonstrate their unique advantages.
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