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A kind of under beam irradiation device of polycarbosilane fiber and its irradiation crosslinking method

A technology of polycarbosilane fiber and irradiation device is applied in the field of ceramic fibers, which can solve the problems of low efficiency, complex structure, and high total dose of irradiation cross-linking, and achieve the effects of reducing cost, inhibiting strength reduction and improving single-line production capacity.

Active Publication Date: 2021-09-24
NAT UNIV OF DEFENSE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the problem of high cost of SiC fibers caused by the complex structure of the device under the electron beam irradiation crosslinking beam of polycarbosilane fiber in the prior art, too high total dose of irradiation crosslinking, low efficiency, and insufficient production capacity of a single line, the present invention provides An under-beam irradiation device for polycarbosilane fibers and a radiation crosslinking method thereof, wherein the polycarbosilane fibers are sealed in an under-beam irradiation box containing an active auxiliary agent, and the under-beam irradiation box is placed on a track, The orbitals are irradiated by cycling through the electron beam generator at a certain rate until the polycarbosilane fibers are not melted

Method used

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  • A kind of under beam irradiation device of polycarbosilane fiber and its irradiation crosslinking method
  • A kind of under beam irradiation device of polycarbosilane fiber and its irradiation crosslinking method
  • A kind of under beam irradiation device of polycarbosilane fiber and its irradiation crosslinking method

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Embodiment 1

[0029] An under-bundle irradiation device for polycarbosilane fibers, the structure of which is shown as figure 1 As shown, it includes the irradiation box B under the beam, the electron beam generator A and the track C; the irradiation box B under the beam is loaded with polycarbosilane fiber and its active auxiliary agent to make the polycarbosilane fiber undergo crosslinking reaction container; the electron beam generator A is used to provide an irradiation source for the polycarbosilane fiber crosslinking in the irradiation box B under the beam, and the irradiation box B under the beam accepts irradiation from below the irradiation source of the electron beam generator A ; The track C is a horizontal closed loop track, which is used to install the under-beam irradiation box B and make the under-beam irradiation box B circulate in the track, wherein the structure of the under-beam irradiation box B is schematically shown as figure 2 and image 3 As shown, it includes an u...

Embodiment 2

[0032] 40g dimethylaminoborane (activator, figure 2 and image 3 The label 7 shown in, the following examples are the same) uniformly placed on the bottom of the central groove of the radiation box B under the beam, then 200g polycarbosilane fiber ( figure 2 and image 3 The label 6 shown in , the same as in the following examples) is laid flat on the fiber support 3, placed in the irradiation box under the beam, and the 0.1mm titanium foil 2 is placed, and the upper cover plate 1, the titanium foil 2, and the bottom plate 4 Alignment seal. Place the sealed under-beam irradiation box on track C, such as figure 1 As shown, then irradiate through the electron beam generator A of 3 MeV according to the translational speed of 5m / min. The energy density is 2mA, the energy density is 0.5kGy / s, and the total irradiation dose of the polycarbosilane fiber reaches 5MGy after repeated cycles, and the polycarbosilane crosslinked fiber is prepared.

[0033] Gel content is a common m...

Embodiment 3

[0036] 2g of trimethylaminoborane is evenly placed in the bottom layer of the center groove of B under the beam irradiation box, and then 200g of polycarbosilane fibers are spread on the fiber support 3, placed in the under beam irradiation box, and a 0.05mm Titanium foil 2, the upper cover plate 1, titanium foil 2, and bottom plate 4 are aligned and sealed. Place the sealed under-beam irradiation box B on the track, such as figure 1 As shown, then irradiate through the 2MeV electron beam generator B at a translational speed of 1m / min. The time for the under-beam irradiation box B to pass through the electron beam generator A for a single time is 20s. The energy density is 1 mA, the energy density is 0.1 kGy / s, and the total irradiation dose of the polycarbosilane fiber reaches 5MGy after repeated cycles, and the polycarbosilane crosslinked fiber is prepared.

[0037] The obtained polycarbosilane crosslinked fiber had a gel content of 95.4%, a boron content of 0.16 wt%, and a...

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Abstract

The invention belongs to the technical field of ceramic fibers, and provides an under-beam irradiation device for polycarbosilane fibers and an irradiation crosslinking method thereof. The device includes an under-beam irradiation box (B), an electron beam generator (A) and a track (C); The electron beam generator (A) provides the irradiation source for the polycarbosilane fiber cross-linking in the beam irradiation box (B); the track (C) is used to install the beam irradiation box (B) and make it The under-beam irradiation box (B) moves circularly in the orbit, wherein the under-beam irradiation box (B) includes an upper cover plate (1), titanium foil (2), fiber support table (3) and bottom plate (4); the bottom plate (4) has a central groove, the central groove is used to load the fiber support platform (3) and the active auxiliary agent, the titanium foil (2) and the upper cover plate (1) are respectively connected with the mouth of the central groove and the outer periphery of the bottom plate (4) Dimensions to form a seal with the bottom plate (4); the fiber support platform (3) is arranged in the central groove of the bottom plate (4) for loading polycarbosilane fibers.

Description

technical field [0001] The invention generally relates to the technical field of ceramic fibers, in particular to an under-bundle irradiation device for polycarbosilane fibers and an irradiation crosslinking method thereof. Background technique [0002] Continuous SiC fiber has low density, excellent mechanical properties, high temperature resistance and good compatibility with ceramic matrix. It is a commonly used structural reinforcement of advanced composite materials and has been widely used in aerospace, aviation and high-performance weaponry. The precursor conversion method is the most successful method for preparing SiC fibers, which mainly includes four process steps: synthesis of polycarbosilane precursors, melt spinning, non-melting and high-temperature firing. The main components of SiC fibers prepared by the precursor method include SiCxOy amorphous phase, β-SiC grains and free carbon. At a high temperature exceeding 1300 °C, the SiCxOy amorphous phase will decom...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D01F9/08C04B35/571C04B35/64
CPCC04B35/571C04B35/64C04B2235/666
Inventor 王小宙邵长伟王应德
Owner NAT UNIV OF DEFENSE TECH