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Method for continuously preparing Si-B-N-O fiber by using PCS (Polycarbosilane) fiber

A si-b-n-o fiber technology, applied in the field of continuous Si-B-N-O fiber preparation, to achieve low dielectric properties, simplify the preparation process, and avoid deliquescence

Active Publication Date: 2010-09-15
NAT UNIV OF DEFENSE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there is no method to prepare Si-B-N-O fibers by adding boronization treatment in the preparation of Si-N-O fibers

Method used

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  • Method for continuously preparing Si-B-N-O fiber by using PCS (Polycarbosilane) fiber
  • Method for continuously preparing Si-B-N-O fiber by using PCS (Polycarbosilane) fiber

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] (1) The PCS ( =1850,T m =212-226°C) placed in the melting cylinder of the melt spinning device (the spinneret hole is 200 holes, the hole diameter is 0.2μm), heated under the protection of high-purity nitrogen and degassed, at 290°C, 0.4 Spinning at a speed of 500m / min under MPa pressure to obtain continuous PCS fibers with an average fiber diameter of 12.5μm; place the PCS fibers in a non-melting furnace and heat them to 190°C in air at a heating rate of 10°C / hr , after 2 hours of heat preservation, cooled to room temperature to obtain PCS non-melting fibers.

[0015] (2) Place the prepared PCS non-melting fiber in a high-temperature furnace, vacuumize and use N 2 After replacement, heat up at a rate of 100°C / hr, and start feeding high-purity NH at a flow rate of 8ml / min / g at 200°C 3 Gas to 1000 ° C, heat preservation for 1 hour to carry out nitriding treatment to obtain nitrided fibers, and wait for the furnace temperature to drop to 60

[0016] Keep warm after 0...

Embodiment 2-4

[0020] Nitriding and boriding of PCS non-melting fibers were carried out according to the method of Example 1, except that the temperatures of boriding were 800°C, 900°C, and 1000°C respectively. The properties of the obtained Si-B-N-O fibers are shown in Table 1.

[0021] Table 1. Composition and properties of Si-B-N-O fibers prepared under different preparation conditions

[0022]

Embodiment 5

[0024] The PCS infusible fiber that prepares in embodiment 1 is put into the H that concentration is 2wt% 3 BO 3 After immersing in the aqueous solution for 1 hour at 40°C, take it out, wash it with deionized water, and dry it in an oven at 100°C for 4 hours. The obtained boronized fibers were placed in a high-temperature furnace, vacuumed and treated with N 2 After replacement, heat up at a rate of 100°C / hr, and start feeding high-purity NH at a flow rate of 8ml / min / g at 200°C 3 Gas to 1000 ° C, heat preservation for 1 hour for nitriding treatment, and then pass high-purity N 2 Air blowing off residual NH 3 After degassing, the temperature was raised to 1300°C at a heating rate of 100°C / hr, and after heat preservation treatment for 1 hour, it was cooled to room temperature to obtain Si-B-N-O fibers.

[0025] The composition of the obtained fiber is Si: 54.56wt%, B: 1.90wt%, N: 29.85wt%, O: 12.26wt% C: 0.16wt%, the average fiber diameter is 10.6μm, and the average tensile ...

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Abstract

The invention discloses a method for continuously preparing an Si-B-N-O fiber by using a PCS fiber, which comprises the following steps of: after air curing treatment is carried out on the PCS fiber, firstly carrying out nitrogen treatment on a PCS curing fiber and then carrying out boronization treatment or firstly carrying out the boronization treatment and then carrying out the nitrogen treatment; then sintering the PCS curing fiber after the nitrogen treatment and the boronization treatment under the high temperature condition of 1200-1400 DEG C under the protection of high-purity N2 gas or argon atmosphere to prepare the Si-B-N-O fiber. Compared with an Si-N-O fiber, the prepared Si-B-N-O fiber has better temperature resistance, lower dielectric performance and simpler preparation process and is easy to realize industrialized batch preparation.

Description

technical field [0001] The invention relates to a method for preparing continuous Si-B-N-O fibers from PCS fibers. Background technique [0002] Wave-transparent material is a multifunctional dielectric material that protects the normal operation of aircraft communication, telemetry, guidance, detonation and other systems, and is widely used in aviation, aerospace, weapons and other fields. With the development of modern science and technology, wave-transparent materials are not only required to have low dielectric constant (ε) and loss tangent (tgθ), but also need to have load-bearing and temperature-resistant properties. Using high-performance wave-transparent fibers as reinforcing fibers to prepare ceramic matrix composites is an effective way to obtain high-performance wave-transparent materials. Industrially, the industrial production of continuous SiC fibers has been realized by the conversion method of organosilicon polymer precursors. Its typical preparation proces...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/597C04B35/622
Inventor 宋永才李永强王得印简科薛金根王军谢征芳
Owner NAT UNIV OF DEFENSE TECH
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