Continuous preparation method of silicon boron nitrogen-based ceramic fiber

A ceramic fiber, nitrogen-based technology is applied in the field of preparation of continuous silicon-boron-nitrogen-based ceramic fibers, which can solve the problem of not showing real objects, and achieve the effects of improving anti-oxidation performance, inhibiting the introduction of oxygen elements, and low cost of raw materials

Inactive Publication Date: 2012-06-27
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most research institutions have reported the preparation of SiBNC ceramic fibers, and the report on the preparation of SiBN ceramic fibers is only a preparation route proposed by M.Jasen of the Max Planck Institute of Germany, but did not show the real thing; the National University of Defense Technology also has SiBN ceramic fibers. Related reports, but only for laboratory-scale staple fiber preparation

Method used

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  • Continuous preparation method of silicon boron nitrogen-based ceramic fiber
  • Continuous preparation method of silicon boron nitrogen-based ceramic fiber
  • Continuous preparation method of silicon boron nitrogen-based ceramic fiber

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] The precursor polymer polysilazaborane (PBSZ) is isolated from air and moisture for melt spinning, the spinning temperature is 130°C, and the winding speed is 200m / min; the precursor polymer fiber is placed in a continuous cracking furnace, Introduce a mixed gas with a volume ratio of ammonia and nitrogen of 70:30, raise the temperature to 280°C at a rate of 0.5°C / min, keep it warm for 2 hours, and perform non-melting treatment at a speed of 0.6mm / min; The fibers were further placed in a continuous high-temperature furnace, and a mixed gas with a volume ratio of ammonia and nitrogen of 70:30 was introduced, and the temperature was raised to 600°C at a rate of 0.5°C / min. The heating rate of ℃ / min was raised to 1000 ℃, kept for 4 hours, then raised to 1600 ℃ at a rate of 1 ℃ / min, kept for 2 hours, and then lowered to room temperature to obtain continuous SiNB ceramic fibers. The C% in the ceramic fiber is 0.1% (see Table 1), which can withstand a temperature of 1500°C in ...

Embodiment 2

[0023] The precursor polymer polysilazaborane (PBSZ) is isolated from air and moisture for melt spinning, the spinning temperature is 150°C, and the winding speed is 200m / min; the precursor polymer fiber is placed in a continuous cracking furnace, Introduce a mixed gas with a volume ratio of ammonia and nitrogen of 90:10, raise the temperature to 280°C at a rate of 1°C / min, keep it warm for 2 hours, and perform non-melting treatment at a speed of 0.6mm / min; The fibers were further placed in a continuous high-temperature furnace, and a mixed gas with a volume ratio of ammonia and nitrogen of 80:20 was introduced, and the temperature was raised to 600°C at a rate of 2°C / min. The heating rate of ℃ / min was raised to 1000 ℃, kept for 5 hours, then raised to 1600 ℃ at a rate of 3 ℃ / min, kept for 6 hours, and then lowered to room temperature to obtain continuous SiNB ceramic fibers. The C% in the ceramic fiber is 0.05%, and it can withstand the temperature of 1500°C in air and 1700°C...

Embodiment 3

[0025] The precursor polymer polysilazaborane (PBSZ) is isolated from air and moisture for melt spinning, the spinning temperature is 250°C, and the winding speed is 800m / min; the precursor polymer fiber is placed in a continuous cracking furnace, Introduce a mixed gas with a volume ratio of ammonia and nitrogen of 50:50, raise the temperature to 280°C at a rate of 0.5°C / min, keep it warm for 3 hours, and perform non-melting treatment at a speed of 0.6mm / min; The fibers were further placed in a continuous high-temperature furnace, and a mixed gas with a volume ratio of ammonia and nitrogen of 50:50 was introduced, and the temperature was raised to 600°C at a rate of 1°C / min. Raise the temperature up to 1000°C at a rate of ~5°C / min, hold for 2 hours, then raise the temperature to 1600°C at a rate of 5°C / min, hold for 8 hours, and cool down to room temperature to obtain continuous SiNB ceramic fibers. The C% in the ceramic fiber is 1.0%, and it can withstand the temperature of 1...

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Abstract

The invention relates to a continuous preparation method of a silicon boron nitrogen-based ceramic fiber, which comprises the following steps 1) melt spinning a precursor polymer polyborosilazane by insulating air under the temperature of 120-250 DEG C to obtain the precursor polymer fiber; 2) putting the precursor polymer fiber in a cracking furnace, introducing mixed gas, heating with 0.5-5 DEG Cmin to 200-350 DEG C and insulating for 2-10 hours to obtain the crosslinked fusion-free fiber; 3) under the condition that the above mixed gas is introduced, continuously heating with 0.5-5 DEG Cmin to 400-1000 DEG C and insulating for 2-10 hours, and heating with 0.5-5 DEG Cmin to 1200-1700 DEG C and insulating for 2-10 hours to obtain the product. The precursor polymer nascent fiber can effectively inhibit the introduction of oxygen element and enhance the anti-oxidation performance of inorganic ceramic fiber, the cost of the raw material is low, the process is stable and easy to adjust, and the method of the invention is suitable for large scale production.

Description

technical field [0001] The invention belongs to the field of preparation of ceramic fibers, in particular to a preparation method of continuous silicon-boron-nitrogen-based ceramic fibers. Background technique [0002] Silicon-boron-nitrogen-based ceramics are new materials born out of the needs of modern warfare and the rapid development of missile technology. Silicon-boron-nitrogen-based ceramic materials have high working temperature, low high-temperature ablation rate, stable performance, no moisture absorption, high strength and transparency. Wave properties and other advantages can meet the requirements of high Mach number missiles. However, ceramic materials have a fatal shortcoming - brittleness. Many scholars have studied methods to solve this world-recognized problem, and finally found that fiber as a reinforcement is a very effective method. Therefore, the research on silicon boron nitrogen ceramic fiber becomes the key point. Silicon nitrogen boron ceramic fibe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/58C04B35/622
Inventor 余木火彭雨晴韩克清王征辉邓智华刘振全张婧孙泽玉李欣达牟世伟李爽
Owner DONGHUA UNIV
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