Silicon carbide fiber needle felt and manufacturing method thereof

A silicon carbide fiber, needle felt technology, applied in heating/cooling fabrics, textiles and papermaking, fabric surface trimming, etc., can solve the problems of high brittleness of silicon carbide fibers, achieve high total porosity, increase X-Y bidirectional mechanical properties , the effect of small aperture

Active Publication Date: 2014-03-26
SUZHOU SAIFEI GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the high brittleness of silicon carbide fiber, it is necessary to improve its mechanical properties as much as possible in functional applications. Therefore, a silicon carbide fiber needle felt with stable thermophysical properties, excellent mechanical properties and high cost performance and its The preparation method is to expand the SiC f / SiC composite materials, environmental protection high-temperature filter materials and emergency braking heat-resistant and wear-resistant materials are important bottlenecks in the application

Method used

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  • Silicon carbide fiber needle felt and manufacturing method thereof
  • Silicon carbide fiber needle felt and manufacturing method thereof
  • Silicon carbide fiber needle felt and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A method for preparing silicon carbide fiber needle-punched felt, step 1, cutting and opening: select infusible fibers with a Si-H bond reaction degree of 65% to 70% and evenly cut them into short fibers with a length of 5 to 8 cm, and the cutter speed 150r / min; step 2, airflow carding, tire forming: the chopped non-melting fibers pass through the feeding roller to the licker-in roller, and are thrown into the high-speed airflow generated by the fan under the high-speed mechanical action of the licker-in roller, and move together with the airflow. The air flow finally passes through the netting curtain, and the fibers are formed on the netting curtain. The netting speed is 10m / min, the diameter of the main cylinder is 1020mm, and the rotation speed is 160rpm. On, flatten, align, start the acupuncture machine, turn on the pre-acupuncture main shaft, wait for it to stabilize and then increase the feeding and discharging speed, reciprocate acupuncture for 1 back and forth, ...

Embodiment 2

[0032] The difference between this embodiment and Embodiment 1 is that the Si-H bond reaction degree of the polycarbosilane infusible fiber in step 1 is 75% to 80%, the frequency of the pre-punched spindle in step 3 is 10 Hz, and the number of silicon carbide felt layers for 3.

Embodiment 3

[0034] The difference between this example and Example 1 is that in step 4, the heating rate of 550°C to 1100°C is 0.5°C / min, the final temperature is 1300°C, the temperature is kept for 1 hour, and then the temperature is naturally lowered.

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Abstract

The invention relates to silicon carbide fiber needle felt and a manufacturing method of the silicon carbide fiber needle felt. Polycarbosilane non-fusible fibers are cut short, loosened, carded through air flow, manufactured into a base, needled and made inorganic at high temperature to form the felt. According to the manufactured silicon carbide fiber needle felt, on the basis of an original silicon carbide overall felt, single-layer needling and stacked layer needling are carried out in the Z direction. Thus, while the Z-direction mechanical properties are greatly improved, the X-direction mechanical properties and thermophysical properties and the Y-direction mechanical properties and thermophysical properties are obviously improved compared with those of non-needled felt, the application range of the silicon carbide fiber needle felt is greatly expanded, and the silicon carbide fiber needle felt has wide application prospects particularly in the fields of high-temperature filtering, high-temperature catalyzing, manufacturing of SiCf/SiC composite materials and the like.

Description

technical field [0001] The invention relates to a silicon carbide fiber needle-punched felt with anti-oxidation, light weight and excellent mechanical properties, in particular to a silicon carbide fiber needle-punched felt and a preparation method thereof. Background technique [0002] Silicon carbide felt has the advantages of low density, wear resistance, high porosity, large specific surface area, corrosion resistance, high temperature resistance, etc. It is an important supporting material for lightweight development trends in aerospace, precision instruments, transportation, environmental protection and other fields, and its The characteristics of easy processing and forming have a great influence on the preparation of SiC f / SiC composite material plays an important role. [0003] According to the information searched, Yu Yuxi and Chen Yong invented "A Preparation Method for Flexible Polycrystalline Silicon Carbide Micron Fiber Mat" (CN103320966A), Yu Yuxi, Chen Yong...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D04H1/4242D04H1/732D04H1/46D06C7/04
Inventor 张卫中张博许然
Owner SUZHOU SAIFEI GRP
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