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Method using air curing to prepare low-oxygen-content continuous SiC fibers

A low oxygen content, fiber technology, applied in the direction of fiber chemical characteristics, textiles and papermaking, etc., can solve the problems of high equipment requirements, low fiber mechanical strength, harsh conditions for the preparation of continuous SiC fibers with low oxygen content, etc., to achieve low production cost, Reduce oxygen content, easy to realize the effect of industrial production

Active Publication Date: 2016-12-07
NAT UNIV OF DEFENSE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a method for preparing continuous SiC fibers with low oxygen content without melting in air. The strength is drastically reduced; in the existing preparation methods, the preparation conditions of continuous SiC fibers with low oxygen content are harsh and the technical problems are too high for equipment

Method used

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  • Method using air curing to prepare low-oxygen-content continuous SiC fibers

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] (1) PCS polymer (softening point is 223 ℃, number average molecular weight is 1.76×10 3 g / mol, the molecular weight distribution coefficient is 3.43) is placed in the melting drum of the melt spinning device, heated to 360°C under the protection of an inert atmosphere, and after it is completely melted into a uniform melt, it is heated at 300°C and 0.5MPa , Carry out draft spinning with the speed of 450m / min, obtain the whole cylinder PCS fibril that average diameter is 12um, 1000 / bundle, continuous length is 500m.

[0048] (2) Place the whole cylinder of PCS fibrils in an air non-melting treatment device for non-melting treatment, raise it to 100 ° C for 1 hour and keep it warm for 2 hours, then raise the temperature to 160 ° C at a heating rate of 5 ° C / hour, at 160 ° C After 5 hours of heat preservation, the temperature was lowered to room temperature to obtain infusible fibers.

[0049] (3) Put the whole cylinder of non-melting fibers in a graphite furnace, pass ...

Embodiment 2

[0053] The whole cylinder of PCS fibrils obtained in Example 1 step (1) is placed in an air non-melting treatment device for non-melting treatment, rises to 100°C in 1 hour and is incubated for 2 hours, then rises to 170°C, heat preservation at 170°C for 2 hours and then lower to room temperature to obtain infusible fibers. Put the whole cylinder of non-melting fibers in a graphite furnace, blow in nitrogen for protection, raise the temperature to 100°C for 1 hour and keep it warm for 1 hour, raise the temperature to 500°C at a rate of 60°C / hour, and then increase the temperature at a rate of 120°C / hour The speed was increased to 1200°C, and the temperature was kept for 0.5 hours to prepare continuous SiC fibers with low oxygen content.

[0054] The SiC fiber prepared in this example has a Si content of 56.23wt%, a C content of 33.09wt%, an O content of 7.18wt%, an average diameter of 11.9um, a tensile strength of 2.30GPa, and a Young's modulus of 202GPa.

[0055] The fiber w...

Embodiment 3

[0057] The whole cylinder of PCS fibrils obtained in Example 1 step (1) is placed in an air non-melting treatment device for non-melting treatment, rises to 100°C in 1 hour and is incubated for 3 hours, then rises to 180°C, heat preservation at 180°C for 0.5 hours and then lower to room temperature to obtain infusible fibers. Put the whole cylinder of non-melting fibers in a graphite furnace, pass through argon for protection, raise the temperature to 100°C for 1 hour and keep it warm for 3 hours, raise the temperature to 500°C at a rate of 80°C / hour, and then increase the temperature at a rate of 150°C / hour The heating rate was increased to 1100°C, and the temperature was kept for 2 hours to prepare continuous SiC fibers with low oxygen content.

[0058] The SiC fiber prepared in this example has a Si content of 56.35wt%, a C content of 32.34wt%, an O content of 9.21wt%, an average diameter of 12.3um, a tensile strength of 2.22GPa, and a Young's modulus of 201GPa.

[0059] T...

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Abstract

The invention provides a method using air curing to prepare low-oxygen-content continuous SiC fibers. The method has the advantages that low-temperature air curing and heat crosslinking are used in a combined manner, the heat crosslinking is added after the air curing as compared with a traditional preparation method, the problem of excessively high fiber oxygen content caused by traditional preparation method merely increasing the air curing temperature is avoided, the problem of fiber doubling caused by the direct high-temperature pyrolysis after the low-temperature air curing is also avoided, and the continuous SiC fibers with oxygen content below 10wt% and good performance are prepared.

Description

technical field [0001] The invention relates to the technical field of continuous SiC fibers, in particular to a method for preparing continuous SiC fibers with low oxygen content without melting in air Background technique [0002] Continuous SiC fiber has a series of excellent properties such as high strength, high modulus, high temperature resistance, oxidation resistance, creep resistance, corrosion resistance, and good compatibility with ceramic matrix. It is a very ideal reinforcing fiber. It is used in aerospace, weapons Some high-tech fields such as aviation, shipbuilding and nuclear industry have broad application prospects, and are strategic raw materials for weaponry and aerospace. For example, silicon carbide ceramic matrix composites (SiC f / SiC), which has the characteristics of high strength, low density and high service temperature. Applying it to high-weight-ratio engines can achieve significant weight reduction and is the best choice to replace existing u...

Claims

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Application Information

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IPC IPC(8): D01F9/10
CPCD01F9/10
Inventor 苟燕子王应德王军王浩简科
Owner NAT UNIV OF DEFENSE TECH
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