Views: 0 Author: Site Editor Publish Time: 2022-02-09 Origin: Site
1. Design requirements for new high temperature conductors
High temperature resistant wires can be used to transmit analog signals, electrical pulses, control currents, etc. in various transformers, transformers, and sensors. High temperature resistant cables that work in a closed electromagnetic field transmission mode can be used to transmit high-frequency signals or general applications in high temperature applications. Transmission of high-power high-frequency signals. With the continuous development of science and technology, the requirements for the use temperature of high temperature resistant wires are getting higher and higher, and the wire size is getting smaller and smaller. Table 1 lists the main electrical properties and mechanical properties requirements of a new type of high temperature resistant wire.
2. Material selection and structure of new high temperature resistant conductors
a. Reasonably select the structure of high temperature resistant wire to make it meet the requirements of wire operating temperature, insulation resistance and mechanical properties. The principle of determining the structure size is to enlarge the insulation outer diameter of the core wire as much as possible under the limited total outer diameter of the high temperature resistant wire, so as to reduce the DC resistance of the high temperature wire.
b. Strengthen process control and take special and effective process measures to ensure the electrical properties and continuous manufacturing length of high temperature resistant wires.
When choosing the conductor material of the new type of high temperature resistant wire, not only should it be considered that it must transmit a large current, but also that the large current will cause the wire to heat up. In order to avoid and delay this process, a metal with relatively stable molecular structure, such as silver or nickel, can be plated on the surface of the copper conductor.
Because high silica glass fiber yarn (glass filament) has good insulation and excellent high temperature resistance, it is one of the preferred insulating materials for high temperature resistant wires. The temperature resistance grade and specification count of the high silica glass fiber yarn are usually selected according to the specifications of the high temperature wire. The larger the count, the finer and softer the high-silica glass fiber yarn is, but its tensile strength is relatively poor; on the contrary, the smaller the count, the thicker the high-silica glass fiber yarn, and the greater its tensile strength , but the softness is poor.
Ordinary high-silica glass fiber yarn insulated high-temperature resistant wires can be used at around 400 ° C, and can also be used in special high temperature (such as 800 ° C in an instant). However, if it is used at high temperature for a long time, its electrical properties and mechanical properties will be damaged, which will affect its normal use in serious cases.
5. Production of new high temperature resistant wires
Due to the special use environment of high temperature resistant wires, the wires are almost always undergoing accelerated aging in a high temperature environment of hundreds of degrees Celsius. Any flaws and spots on the wires will affect the service life of the wires. Therefore, the material selection and process manufacturing of high temperature resistant wires , Manufacturing environment, cleanliness is very important. The whole manufacturing process of high temperature resistant wire can be divided into several steps, such as conductor size positioning, high silica glass fiber yarn winding, insulation winding, coating liquid dipping, high temperature baking and sintering.
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