Unlock instant, AI-driven research and patent intelligence for your innovation.

Preparation method of C/SiC core-shell structure composite fiber and composite fiber

A composite fiber and shell-core structure technology, applied in carbon fiber, fiber processing, textiles and papermaking, etc., can solve the problems of fiber damage, high cost, fracture, etc., achieve uniform and stable coating, good tensile strength, and improve tensile strength The effect of intensity

Active Publication Date: 2021-01-05
HARBIN INST OF TECH AT WEIHAI
View PDF4 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the extremely high cost of preparing SiC ceramic fibers by polycarbosilane precursor method, the application field of SiC fibers is greatly limited.
At the same time, the fracture toughness of SiC fibers is insufficient, and it is easy to cause fiber damage or even fracture during the preparation of the preform, which affects the performance of the overall structural mechanical properties of the preform.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Preparation method of C/SiC core-shell structure composite fiber and composite fiber
  • Preparation method of C/SiC core-shell structure composite fiber and composite fiber
  • Preparation method of C/SiC core-shell structure composite fiber and composite fiber

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 11

[0040] In this example, in the preparation stage of the composite material, the commercial carbon fiber is first pretreated: the carbon fiber is placed in a NaOH solution with a mass fraction of 5% to remove impurities on the surface of the carbon fiber, and then it is cleaned with alcohol, and then soaked in Ultrasonic dispersion is carried out in 5% HNO3 solution to increase active groups on the surface of C fibers, which is easy for subsequent reactions, and then placed in a vacuum drying oven to dry, and the carbon fibers obtained after treatment can have good dispersibility.

[0041] The process of preparing molten salt is as follows: LiNO 3 , KCll and NaSO 4 According to the molar ratio of 1:1:1.5, ball milling and mixing were carried out for 2 hours to obtain a homogeneous mixture of molten salt. Silica sol (concentration 15wt%, with SiO 2 10H 2 O meter) and carbon black and silane coupling agent (including but not limited to in the present embodiment, in the impleme...

Embodiment 12

[0046] In this example, in the preparation stage of the composite material, the commercial carbon fiber is firstly pretreated: put the carbon fiber in a 7% NaOH solution to remove impurities on the surface of the carbon fiber, then use alcohol to clean it, and then soak it Ultrasonic dispersion is carried out in 15% HNO3 solution to increase active groups on the surface of C fibers, which is easy for subsequent reactions, and then placed in a vacuum drying oven to dry, and the carbon fibers obtained after treatment can have good dispersibility.

[0047] The process of preparing molten salt is as follows: LiNO 3 , KCl and NaSO 4 According to the molar ratio of 1:2:0.5, ball milling and mixing were carried out for 4 hours to obtain a homogeneous mixture of molten salt. Silica sol (concentration 25%, calculated as SiO2·15H2O) and carbon black and silane coupling agent, according to the molar ratio of 1:5.5:0.03 strong ultrasonic plus mechanical stirring for 4h, or uniform disper...

Embodiment 13

[0052] In this example, in the preparation stage of the composite material, the commercial carbon fiber is first pretreated: the carbon fiber is placed in a NaOH solution with a mass fraction of 9% to remove impurities on the surface of the carbon fiber, and then it is cleaned with alcohol, and then soaked in Ultrasonic dispersion is carried out in 10% HNO3 solution to increase active groups on the surface of C fibers, which is easy for subsequent reactions, and then placed in a vacuum drying oven to dry, and the carbon fibers obtained after treatment can have good dispersibility.

[0053] The process of preparing molten salt is as follows: LiNO 3 , KCl and NaSO 4 According to the molar ratio of 1:3.5:1, ball milling and mixing were carried out for 6 hours to obtain a homogeneous mixture of molten salt. Silica sol (concentration 35%, calculated as SiO2·12H2O) and carbon black and silane coupling agent, according to the molar ratio of 1:5:0.02 strong ultrasonic plus mechanical...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
tensile strengthaaaaaaaaaa
elastic modulusaaaaaaaaaa
tensile strengthaaaaaaaaaa
Login to View More

Abstract

The invention discloses a preparation method of C / SiC core-shell structure composite fiber. The method comprises the following steps of step A, raw material preparation, wherein a carbon fiber raw material is pretreated to obtain carbon fiber I with good dispersity and increased surface active groups, molten salt raw materials are mixed to obtain mixture molten salt, and silica sol, carbon black and a silane coupling agent are mixed, dried and crushed to obtain mixed powder of xerogel and the carbon black; and step B, molding, wherein the mixture molten salt is mixed with the mixed powder to obtain an embedding material, the carbon fiber I is sintered, cooled and separated under embedding of the embedding material to obtain the C / SiC core-shell structure composite fiber. According to the preparation method, a molten salt melting precipitation method is adopted, the C / SiC composite fiber with a SiC nano-structure shell layer on the surface is prepared at a low temperature, and the C / SiCcomposite fiber has a good shell-core structure and has good tensile strength, elasticity modulus and wave absorption performance.

Description

technical field [0001] The invention belongs to the technical field of C / SiC core-shell structure composite fiber, and in particular relates to a preparation method of C / SiC core-shell structure composite fiber and the composite fiber. Background technique [0002] As a wide bandgap semiconductor, SiC fiber material has adjustable resistivity in the range of 10-3~10-4Ω·m, high breakdown field strength, high saturation carrier drift velocity and high thermal conductivity. In addition, the high strength, low density, superior dielectric properties and oxidation resistance of SiC materials make it suitable for harsh environments with high temperature and high frequency, and it has high service reliability as a high-temperature structural wave-absorbing material, which has attracted widespread attention. Therefore, SiC carbon fiber has irreplaceable advantages as a high-temperature oxidation-resistant structural material reinforcement and electromagnetic wave dielectric material...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): D06M11/77D06M11/38D06M11/64D06M101/40
CPCD06M11/77D06M11/38D06M11/64D06M2101/40
Inventor 张涛王建王华涛夏龙钟博王春雨
Owner HARBIN INST OF TECH AT WEIHAI