A kind of boron nitride continuous fiber and its preparation process and application

A preparation process and continuous fiber technology, which are applied to boron nitride continuous fiber and its preparation process and application field, can solve the problems of restricting the large-scale continuous production of continuous fibers, high initial melting temperature of boric acid, and high fiber diameter dispersion. Solve interfacial wettability and compatibility issues, short curing time, and the effect of clear fiber interface

Active Publication Date: 2020-05-19
SHANDONG RES & DESIGN ACADEMY OF IND CERAMICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The Chinese patent application number 90107561.2 discloses a boron nitride fiber preparation process and its equipment. The article "Study on the Reaction Thermodynamic Kinetics of Boron Nitride Fiber Prepared by Chemical Transformation Method", both of which are recorded in the prior art The preparation method of boron nitride fiber, but the above-mentioned prior art generally has the following disadvantages: (1) the initial melting temperature of boric acid is higher, which wastes energy; (2) the dispersion degree of fiber diameter is higher; (3) it is easy to appear in Fracture during the preparation of continuous fibers; (4) limits the large-scale continuous production of continuous fibers; (5) the effect of the coating on preventing strength attenuation is not obvious, and it has a large proportion in the fiber, and the curing is slow. Disadvantages such as inconvenient unwinding of dried fibers and difficulty in coating removal

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Use 98% (weight) boric acid reagent + 2% (weight) rare earth yttrium as raw materials, put it into the chemical material drawing furnace and melt it, the initial melting temperature is set to 700 ° C, the melted glass flows into the chemical material drawing furnace wire drawing bushing Then, according to the glass fiber process, a boron oxide fiber with a diameter of 6 microns and 200 per bundle is drawn, and the fiber is plied to become a 1K boron oxide bundle, and then 4 bundles of boron nitride bundles are twisted and plied, After that, carry out nitriding reaction in a continuous nitriding furnace, at 800°C, feed ammonia gas, the total flow rate of ammonia gas is 2m 3 / h, high-temperature stretching nitriding reaction is carried out in the continuous high-temperature stretching nitriding furnace, and the continuous treatment of the fiber in the heat treatment furnace under nitrogen atmosphere is realized through the control of the winding and unwinding equipment. Th...

Embodiment 2

[0028] Using 90% (weight) boric acid reagent + 10% (weight) rare earth neodymium as raw materials, put it into the chemical material drawing furnace and melt it. The initial melting temperature is set to 700°C, and the melted glass flows into the chemical material drawing furnace to draw the bushing Then, according to the glass fiber process, a boron oxide fiber with a diameter of 7 microns and 200 per bundle is drawn, and the fiber is plied to become a 0.5K boron oxide bundle, and then three bundles of boron nitride bundles are twisted Joint stock, after that, carry out nitriding reaction in the continuous nitriding furnace, at 950 ℃, feed ammonia gas, the total flow rate of ammonia gas is 2m 3 / h, high temperature stretching nitriding reaction is carried out in the continuous high temperature stretching nitriding furnace, and the continuous treatment of the fiber in the heat treatment furnace under nitrogen atmosphere is realized through the control of the winding and unwindi...

Embodiment 3

[0030] Using 95% (weight) boric acid reagent + 5% (weight) rare earth cerium as raw material, put it into the chemical material drawing furnace and melt it. The initial melting temperature is set to 700°C, and the melted glass flows into the chemical material drawing furnace to draw the bushing Then, according to the glass fiber process, a boron oxide fiber with a diameter of 5 microns and 200 per bundle is drawn, and the fiber is plied to become a 1.5K boron oxide bundle, and then 5 bundles of boron nitride bundles are twisted Joint stock, after that, carry out nitriding reaction in continuous nitriding furnace, at RT (room temperature: RoomTemperature), feed ammonia gas, the total flow rate of ammonia gas is 2m 3 / h, high temperature stretching nitriding reaction is carried out in the continuous high temperature stretching nitriding furnace, and the continuous treatment of the fiber in the heat treatment furnace under the nitrogen atmosphere is realized through the control of...

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Abstract

The invention discloses boron nitride continuous fiber as well as preparation technology and an application thereof. The method comprises the following steps: fusion of materials is carried out and wire drawing is carried out in order to form precursor fiber, a low temperature nitridation reaction is carried out, high temperature hot stretch is carried out, and finally a protection coating is coated in order to obtain a finished product; fusion and wire drawing are automatic feeding and continuous wire drawing. Compared with prior art, intermittent fusion and wire drawing are automatic feedingand continuous wire drawing, discretion of product diameter is reduced from original 12% to 7% or below, and wire drawing is uniform.

Description

technical field [0001] The invention belongs to the technical field of inorganic fibers, and in particular relates to a boron nitride continuous fiber and its preparation process and application. Background technique [0002] With the development of weapon technologies such as hypersonic speed, long endurance and precision guidance, the total amount of aerodynamic heating on the surface of the missile body during flight is increasing. In order to ensure the normal aerodynamic shape of the weapon and the electromagnetic transmission signal, the The ablation performance and electrical performance of the radome material have put forward strict requirements. The existing available quartz ceramics, quartz fiber composite materials, and silicon nitride ceramics are difficult to meet the long-term high-state use requirements above 2000 ° C. In the existing material system, BN fiber-reinforced nitride composite materials are high-temperature wave-transparent materials in a higher st...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C03B37/01C04B35/583C04B35/622C04B35/64C04B41/84
Inventor 张铭霞李勇齐学礼栾强李茹唐建新黄健孙淑敏
Owner SHANDONG RES & DESIGN ACADEMY OF IND CERAMICS
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