A method for preparing continuous SIC fibers capable of wide-ranging controllable resistivity

A large-scale, resistivity technology, applied in the direction of fiber chemical characteristics, textiles and papermaking, etc., can solve the problems of difficult large-scale control of resistivity, difficult wide-range adjustment of resistivity, complex process conditions, etc., to reduce production The effect of cost, good mechanical properties and simple process

Active Publication Date: 2017-07-07
NAT UNIV OF DEFENSE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, although these methods can obtain SiC fibers with a resistivity of a certain order, it is difficult to achieve a wide range of adjustable resistivity.
[0014] In summary, although there are many ways to adjust the resistivity of SiC fibers, they all require complex process conditions, and it is difficult to achieve a wide range of resistivity regulation at the same time.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

reference example 1

[0039] Put 2.8kg of polydimethylsilane and 1.5L of xylene in a high-temperature and high-pressure synthesis device, vacuumize, replace with nitrogen, repeat three times, and then raise the temperature to 430°C at a rate of 100°C / h under the protection of nitrogen, and keep it warm 8h, cool down to room temperature; take it out, add 1.5L xylene to dissolve, then filter to remove insoluble matter, put the filtrate in a distillation device, distill off xylene, then raise the temperature to 350°C at a rate of 60°C / h, reduce Distill under pressure for 2 hours and cool to room temperature to obtain SiC ceramic precursor polycarbosilane PCS-1 with a molecular weight of 3500 g / mol and a softening point of 170°C.

reference example 2

[0041] Put 1 kg of PCS-1 obtained in Reference Example 1, 20 g of aluminum acetylacetonate and 1.5 L of xylene in a synthesis device, vacuumize, replace with nitrogen, repeat three times, and under the protection of nitrogen, heat up to 300 °C at a rate of 100 ° C / h. ℃, keep warm for 5h, then heat up to 420°C at a speed of 60°C / h, keep warm for 2h, cool to room temperature, take it out and add 1.5L xylene to dissolve, then filter to remove insoluble matter, put the filtrate in a distillation device, and distill off After xylene, heat up to 350°C at 60°C / h, distill under reduced pressure for 2h, and cool to room temperature to obtain a SiC ceramic precursor polyaluminocarbosilane with a molecular weight of 4970g / mol and a softening point of 193°C. PACS-2.

reference example 3

[0043] Put 300g of liquid polysilane and 6g of ferrocene in a high-temperature and normal-pressure synthesis device, evacuate, replace with nitrogen, repeat three times, and then raise the temperature to 370°C at a rate of 100°C / h under the protection of nitrogen, and keep it warm for 10h. Cool to room temperature, take it out and add 500mL xylene to dissolve, then filter to remove insoluble matter, put the filtrate in a distillation device, distill off xylene, then raise the temperature to 350°C at a rate of 60°C / h, and distill under reduced pressure for 2h. After cooling to room temperature, the SiC ceramic precursor polyferrocarbosilane PFCS-3 with a molecular weight of 8500 g / mol and a softening point of 220° C. was obtained.

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Abstract

A method for preparing a continuous SiC fiber capable of controlling the electrical resistivity in a wide range, comprising the following steps: (1) stretching and spinning the SiC ceramic precursor to obtain fibrils; (2) placing the fibrils in a non-melting treatment In the device, vacuumize, then fill with an inert atmosphere, repeat the above operation ≥ 2 times, cross-link by electron beam irradiation or active atmosphere to make the gel content of the fiber ≥ 85%, and obtain an insoluble fiber; (3) put The non-melting fiber is placed in a high-temperature furnace, and an inert atmosphere or a mixed gas of an active atmosphere and an inert atmosphere is introduced, and the temperature is raised to 1000-1600°C at a rate of 60-200°C / h, and kept for 0.5-2.0h to obtain continuous SiC fibers. The method of the invention can produce continuous SiC fibers whose resistivity is adjustable in a wide range of 10‑1-106Ω·cm according to requirements, with uniform average diameter and good mechanical properties; the method of the invention has simple process, is easy to realize industrial production, and has low cost.

Description

technical field [0001] The invention relates to a method for preparing a continuous SiC fiber, in particular to a method for preparing a continuous SiC fiber capable of controlling the resistivity in a wide range. Background technique [0002] Continuous SiC fiber is a ceramic fiber with excellent properties such as high strength, high modulus, high temperature resistance, oxidation resistance, low density, and chemical corrosion resistance. It is an important reinforcing phase of composite materials, and the high-performance ceramic matrix composites reinforced by it can be applied to cutting-edge fields such as space shuttles and high-performance engines. In recent years, with the continuous advancement of science and technology and the development needs of weapons and equipment, the development of continuous SiC fibers for microwave-absorbing composite materials has become a research hotspot. Continuous SiC fibers with different orders of resistivity have become high-temp...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D01F9/10
Inventor 苟燕子王浩王应德王军简科邵长伟王小宙
Owner NAT UNIV OF DEFENSE TECH
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