Method for protecting thin-wall energy gathering cutting ropes by using Parylene micro-nano films

A cutting wire, micro-nano technology, applied in metal material coating process, coating, gaseous chemical plating, etc. The wall pipe is prone to corrosion and other problems, so that the composition of the film is easy to control, the step coverage is excellent, and the effect of meeting the protection requirements is achieved

Inactive Publication Date: 2020-04-07
NANJING UNIV OF SCI & TECH
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AI Technical Summary

Problems solved by technology

[0004] Due to the unsatisfactory temperature and humidity environment tolerance of the silicone resin DBSF-6102 three-proof protective agent currently used, and the manual application of the three-proof protective agent, the uniformity cannot be guaranteed. In places where the local paint film is thin, the airborne o 2 、H 2 O and CO 2 Molecules easily penetrate into the interface between the three-proof protective agent and the thin-walled tube, forming a dissolved film locally
Thin-walled tubes are prone to corrosion and rupture during environmental assessment and long-term storage, causing water to enter the cutting wire and directly contact the agent, and the agent will be hydrolyzed and deteriorated due to moisture, resulting in abnormal detonation or broken explosion of the cutting wire

Method used

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  • Method for protecting thin-wall energy gathering cutting ropes by using Parylene micro-nano films
  • Method for protecting thin-wall energy gathering cutting ropes by using Parylene micro-nano films
  • Method for protecting thin-wall energy gathering cutting ropes by using Parylene micro-nano films

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Embodiment

[0029] Protection of Thin-Walled Lead Pipe Cutting Cables Using Parylene C

[0030] Cut the thin-walled lead-antimony alloy (with an antimony content of 2%) with a length of 10 m into a ring shape and put it into a vacuum chamber of a chemical vapor deposition device. It should be noted that the filament should be suspended in the vacuum chamber, and its diameter is about tens of microns, so that the thin-walled cutting wire is suspended on the filament, and there is no mutual contact between each ring, such as Figure 4 shown. When the vacuum in the chamber is lower than 2.0×10 -2 At torr, evaporate at 180°C, crack Parylene C raw material at 700°C, cool down at the end of the equipment through a cold trap, keep the temperature in the vacuum deposition chamber at about 35°C, and finally cut the cable of Parylene C monomer in the thin-walled lead pipe Polymerization occurs on the outer wall, which is about 25 μm thick. After a series of environmental assessment tests, the cu...

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Abstract

The invention discloses a method for protecting thin-wall energy gathering cutting ropes by using Parylene micro-nano films. A chemical vapor deposition method is adopted to coat Parylene films with micro-nano-scale thicknesses on the outer surfaces of the thin-wall energy gathering cutting ropes for damp prevention, salt mist prevention and mould prevention of the thin-wall energy gathering cutting ropes to enable the protecting performance to meet environmental test requirements stated by the GJB344-87 general design specification for insensitive electric detonators. After experimental tests, the thin-wall lead pipe energy gathering cutting ropes still achieve high reliability, and can be applied to interstage separation of multistage propulsion rockets, window casting and slitting of mother-son bullet shells.

Description

technical field [0001] The invention relates to the field of protection methods for thin-walled energy-gathering cutting cables such as moisture-proof, salt-spray proof, and mildew-proof, in particular to a method for protecting thin-walled energy-gathering cutting cables by utilizing Parylene micro-nano films. Background technique [0002] The thin-walled energy-gathering cutting cable is a kind of pyrotechnic product with a special structure. It uses the energy-gathering effect of the hollow charge to form a high-temperature, high-speed metal jet along the axis of the cutting cable after the charge explodes, cutting the pre-separation surface to achieve structural separation. purpose, such as figure 1 shown. Shaped energy cutting cables can be used for stage separation of multi-stage propellant rockets, window ejection and flap cutting of sub-warhead shells, etc. It has the characteristics of high reliability, high synchronization, and light structure weight. [0003] Th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C16/44C09D165/00
CPCC09D165/00C23C16/44
Inventor 朱朋徐聪沈瑞琪
Owner NANJING UNIV OF SCI & TECH
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