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Special needle for preparing ceramic fiber preform and use method of needle

A technology of ceramic fibers and preforms, which is applied to needle punching machines, textiles and papermaking, non-woven fabrics, etc., can solve the problems of decreased mechanical properties of quartz composite materials, poor mechanical properties of composite materials, and high process costs, and achieves low processing costs. , not easy to separate, improve the effect of mechanical properties

Active Publication Date: 2020-01-10
HARBIN INST OF TECH AT WEIHAI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Lead to a significant decline in the mechanical properties of the subsequently prepared quartz composites
However, the quartz short fiber separation and suction filtration molding process requires the use of a large amount of solvent, which has a significant impact on the environment, and a large number of adsorbed hydroxyl groups are formed on the surface of the fiber. Therefore, the cost of the process is high, the mechanical properties of the prepared composite material are poor, and the environment is polluted.

Method used

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  • Special needle for preparing ceramic fiber preform and use method of needle

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] In this embodiment, the diameter of the gas jet holes for needle punching of the ceramic fiber preform is 0.12mm, and the gas jet hole density is 35 / cm 2 , the gas jet holes are randomly distributed on the acupuncture body, and the included angle between the gas jet holes and the axis of the acupuncture body is 15°.

[0021] The method for preparing the ceramic fiber preform by using the above-mentioned special acupuncture for the ceramic fiber preform is as follows:

[0022] (1) Chopped ceramic fiber long yarn (type A 50tex) into 80mm long chopped fibers.

[0023] (2) Dry disperse the chopped fiber and make it weigh 15g / m 2 The whole process does not add softener or any other liquid solvents.

[0024] (3) The mesh tire and ceramic fiber unidirectional cloth 80g / m 2 (or 2D woven cloth) flocking composite, get 95g / m 2 composite blanks.

[0025] (4) After overlapping the two-layer composite blanks prepared in the above steps, use a needle punching machine to perform ...

Embodiment 2

[0028] In this embodiment, the diameter of the gas jet holes for needle punching of the ceramic fiber preform is 0.15mm, and the gas jet hole density is 45 / cm 2 , the positions of the gas jet holes on the acupuncture body are randomly distributed, and the angle between the gas jet holes and the axis of the acupuncture body is 30°.

[0029] The method for preparing the ceramic fiber preform by using the above-mentioned special acupuncture for the ceramic fiber preform is as follows:

[0030] (1) First, chop the ceramic fiber long yarn (type A 200tex) into chopped fibers with a length of 120mm.

[0031] (2) Dry disperse the chopped fiber and make it weigh 40g / m 2 The whole process does not add softener or any other liquid solvents.

[0032] (3) Combine the net tire with ceramic fiber unidirectional cloth 120g / m 2 (or 2D woven cloth) flocking composite, get 150g / m 2 composite blanks.

[0033] (4) After overlapping the 20-layer composite blanks prepared in the above steps, us...

Embodiment 3

[0036] In this embodiment, the diameter of the gas jet holes for needle punching of the ceramic fiber preform is 0.16mm, and the gas jet hole density is 60 / cm 2 , the positions of the gas jet holes on the acupuncture body are randomly distributed, and the included angle between the gas jet holes and the axis of the acupuncture body is 60°.

[0037] The method for preparing the ceramic fiber preform by using the above-mentioned special acupuncture for the ceramic fiber preform is as follows:

[0038](1) First, chop the ceramic fiber long yarn (Type B, 1000tex) into chopped fibers with a length of 150mm.

[0039] (2) Dry disperse the chopped fiber and make it weigh 80g / m 2 The whole process does not add softener or any other liquid solvents.

[0040] (3) Combine the net tire with ceramic fiber unidirectional cloth 420g / m 2 (or 2D woven cloth) flocking composite, get 500g / m 2 composite blanks.

[0041] (4) After overlapping the 16-layer composite blanks prepared in the above...

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Abstract

The invention discloses a special needle for preparing a ceramic fiber preform and a use method of the needle, and relates to the field of ceramic fiber preforms. The needle structurally comprises a needle body, an airflow cavity is formed in the needle body, gas jet holes randomly distributed in the needle body are formed in the airflow cavity, the diameter of each gas jet hole is 0.08mm-0.2mm, the density of the gas jet holes is 35-60 holes / cm<2>, and the included angle formed between axes of each gas jet hole and the needle body is 10-75 degrees. The use method includes the steps: choppingceramic fiber filament yarns to prepare a web, and flocking and compounding the web and ceramic fiber unidirectional cloth to obtain a composite preform body; compounding and needling at least two overlapped composite preform bodies by a needling machine provided with the special needle, connecting the airflow cavity of the special needle with an air source and inputting compressed air. The special needle has the advantages of low processing cost, high production efficiency, less fiber damage, difficulty in separating layers, excellent mechanical properties of the prepared ceramic fiber preform and the like.

Description

technical field [0001] The invention relates to the field of ceramic fiber prefabricated body, in detail, it is a special needle for preparing ceramic fiber prefabricated body with low processing cost, high production efficiency, little damage to fiber, difficult separation between layers, and excellent mechanical properties of the prepared ceramic fiber prefabricated body. Thorns and their method of use. Background technique [0002] We know that ceramic fiber is SiO 2 High-performance fibers with heat-resistant, corrosion-resistant and weavable properties with a mass fraction of more than 99.9%. High strength retention rate at high temperature, low thermal expansion coefficient, thermal shock resistance, chemical stability, light transmission and electrical insulation. In addition, it has an unparalleled low dielectric constant and is an ideal wave-transmitting material. The long-term use temperature of ceramic fiber can reach 1200°C, and the softening point temperature...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D04H18/02
CPCD04H18/02
Inventor 张涛吴来军于海静温广武黄小萧钟博夏龙
Owner HARBIN INST OF TECH AT WEIHAI