High temperature wire for aerospace and its production process

Abstract

The invention discloses an aerospace high-temperature wire and the production technology of the aerospace high-temperature wire, and belongs to the technical field of cables. The aerospace high-temperature wire is characterized by being formed in the mode that an inner polyether-ether-ketone insulating layer wraps a nickel-clad copper-clad aluminum soft stranded conductor wire core in an extruded and thin-wall mode, and then a long fiber wrapping layer wraps the inner polyether-ether-ketone insulating layer in a winding and seamless mode. According to the aerospace high-temperature wire and the production technology of the aerospace high-temperature wire, the fiber wrapping layer is adopted, and therefore the cross-arc resistance, the cutting-conduction resistance and the reliability of the wire are improved. The produced wire is light in weight, small in outer diameter, high-temperature resistant, solvent resistant, good in fire resistance and good in moisture resistance.

Description

technical field [0001] The invention relates to a wire structure and its production process, in particular to a high-temperature wire for aerospace and its production process, and belongs to the technical field of electric cables. Background technique [0002] Aerospace wire and cable is one of the products with the highest grade, the best performance, and the most demanding safety requirements among military cables, including various wires and cables used in aircraft, satellites, rockets and other aircraft. Because these products have been operating at high altitude or even outer space for a long time, they are required to have the advantages of small outer diameter, light weight, high and low temperature resistance, friction resistance, oil resistance, flame retardancy and easy installation. With the increase of the operating speed of aircraft and aircraft, the requirements for the temperature resistance level of the connecting cables located in the aircraft engine area ar...

AI Technical Summary

Problems solved by technology

The insulating materials that meet the temperature requirements mainly include "fusible polytetrafluoroethylene (PFA)" or "irradiation crosslinked ethylene-tetrafluoroethylene copolymer (XETFE)", but this type of wire has the following defects: ① fusible PTFE insulated wires have low mechanical strength and poor radiation resistance, especially the material has a large specificity. Even if the "thin-walled" type is selected, it cannot meet the "weight reduction" requirements of airborne or spaceborne cables; ②Although The specific gravity of the radiation cross-linked ethylene-tetrafluoroethylene copolymer insulated wire is small, but the anti-series arc performance of the single-layer "thin-walled" type is not good, and the reliability of the wire is poor, while the size and weight of the double-layer wire It cannot meet the requirements, and because the insulation layer of this type of wire must be cross-linked by radiation to achieve its performance, the production cycle and cost performance of the wire have no significant market competitive advantages; ③ fluoropolymer insulated wire has serious Electrostatic adsorption, which is easy to accumulate dust or other impurities, which may cause sediment to contaminate the electrical components of the aircraft, so the wires cannot meet the cleaning requirements after "on the machine"

The structural form is mainly "polyimide extruded layer wrapped with polytetrafluoroethylene raw tape (need to be melted and sealed)" or "polyimide coated with soluble polytetrafluoroethylene composite tape wrapped with polyimide Tetrachlorethylene raw tape (need to be melted and sealed), this type of wire also has the following defects: ①The former is due to the serious water absorption of polyimide material, and the wear resistance of the outer wrapping of PTFE is poor ( It is easy to be damaged during installation) and is not resistant to radiation, so it is obviously not suitable for airborne or spaceborne; , nor can it guarantee that the wires will pass the tests of anti-cross arc, anti-cut through, etc., and due to the defects of the "wrapped" type insulation layer itself, the conductors of small-sized (generally 22AWG and below) wires must be designed as high-strength alloys, so its technology Economical is not high

[0006] In order to avoid the above-mentioned defects of poor reliability of wires, there are also reports of structural optimization schemes at home and abroad, mainly to set a braided sheath outside the wires. Although the insulation layer can be effectively "protected" to a certain extent, due to the small size wire The shortcoming that the layer is easy to loose leads to the size of the finished wire is still "out of tolerance". Due to the factor of braid coverage, the reliability of the product still cannot meet the high requirements of aerospace for cables.

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