What are the factors that affect the aviation plug PIN? In fact, the contact material, vertical pressure, surface morphology, the use of voltage and current and other factors will have an impact on it. Today, our ConnToConn will have a detailed introduction for everyone.
Affected by the technical conditions of aviation plugs, the contact specifications of the same specifications made of different materials have different resistance indexes. For example, the contact resistance of contacts with a diameter of 1 mm, the contact resistance of copper alloy should not exceed 5 mΩ. The contact resistance of the ferroalloy material is less than or equal to 15mΩ.
Vertical pressure refers to the force generated by a surface in contact with each other and perpendicular to the contact surface. The number and area of contact micro-dots will increase with the increase of vertical pressure, and the contact micro-point will also transition from elastic deformation to plastic deformation, thereby reducing the concentrated resistance, and the contact resistance will decrease as the concentrated resistance decreases.
Dust, rosin and oil stains will be deposited on the surface of the joint to form a loose surface. The surface of the film will contain particulate matter. This film will carry particulate matter embedded in the microscopic pits on the contact surface, reducing contact. Area, increasing contact resistance, resulting in unstable performance.
Under the influence of physical adsorption and chemisorption, a fouling film is deposited on the surface of the contact point, which increases the contact resistance, resulting in unstable performance. In order to improve the performance and reduce the contact resistance, the aviation plug must have clean production environment conditions in the production and assembly environment, as well as a complete cleaning process and necessary structural sealing measures, and the storage and use operating environment should also be good.
When the voltage reaches a certain threshold, the contact film will be broken down, and the contact resistance will drop rapidly. However, due to the thermal effect, the chemical reaction in the vicinity of the film will accelerate the repair of the film. The slight fluctuation of the voltage will cause the current to occur. A ten-fold range of variation causes a large change in contact resistance.
If the current exceeds a certain value, Joule heat will be generated at the tiny point of the contact interface, which will soften or melt the metal, affecting the concentrated resistance and reducing the contact resistance. This must be known when testing and using contacts.
