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Low cost preparation method for needle punched fabrics reinforced quartz composite ceramic radome

A technology of composite ceramics and needle-punched fabrics, which is applied in the field of preparation of low-cost needle-punched fabric-reinforced quartz composite ceramic radome, and can solve the problems of high fiber yarn content, long cycle time, and high cost

Active Publication Date: 2012-10-17
湖北三江航天江北机械工程有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The price of high-strength quartz fiber yarn used in the raw materials used is 3,000 yuan / kg; the cost of profile weaving is 10,000 yuan / kg, and the density of the braid is > 1.0g / cm 3 , the content of fiber yarn is high, the molding time is about 2 months, and the cycle is long, so the cost is high

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
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  • Low cost preparation method for needle punched fabrics reinforced quartz composite ceramic radome
  • Low cost preparation method for needle punched fabrics reinforced quartz composite ceramic radome
  • Low cost preparation method for needle punched fabrics reinforced quartz composite ceramic radome

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A hemispherical radome process is as follows:

[0026] 1) Design a hemispherical mandrel according to the geometric dimensions of the radome, and puncture the corresponding hemispherical profiling structure fabric layer by layer by needle punching in the order of a layer of quartz cloth and a layer of quartz felt on the mandrel;

[0027] 2) The fabric is boiled in boiling water for 40 hours and then released from the mold;

[0028] 3) Roast the demoulded fabric at 400°C for 4 hours, and then pickle it. The volume ratio of concentrated hydrochloric acid to concentrated nitric acid in the acid solution used for pickling is 3:1;

[0029] 4) Put the acid-washed fabric on the mandrel, repeat the dipping and drying process for 4 times, and then release the mold again. During dipping, the silica sol needs to be vibrated continuously. The dipping process is to place the fabric at a density of 1.10g / cm 3 Immersed in the silica sol for 20min, the drying is to dry the impregnat...

Embodiment 2

[0037] The main technological process of a conical radome is as follows:

[0038] 1) Design a cone-shaped mandrel according to the geometric dimensions of the radome, and puncture the mandrel into a corresponding conical profiling structure fabric by needle punching in the order of the interval between the quartz cloth and the quartz felt;

[0039] 2) The fabric is boiled in boiling water for 20 hours and then released from the mold;

[0040] 3) Roast the demoulded fabric at 700°C for 2 hours, and then pickle it. The volume ratio of concentrated hydrochloric acid to concentrated nitric acid in the acid solution used for pickling is 3:1;

[0041] 4) Put the acid-washed fabric on the mandrel, repeat the dipping and drying treatment twice, and then release the mold again. During the dipping, the silica sol needs to be continuously vibrated. The dipping process is to place the fabric at a density of 1.10g / cm 3 Immersed in the silica sol for 20min, the drying is to dry the impre...

Embodiment 3

[0049] The main technological process of a conical radome is as follows:

[0050] 1) Design a cone-shaped mandrel according to the geometric dimensions of the radome, and puncture the mandrel into a corresponding conical profiling structure fabric by needle punching in the order of the interval between the quartz cloth and the quartz felt;

[0051] 2) The fabric is boiled in boiling water for 30 hours and then released from the mold;

[0052] 3) Roast the demoulded fabric at 550°C for 3 hours, and then pickle it. The volume ratio of concentrated hydrochloric acid to concentrated nitric acid in the acid solution used for pickling is 3:1;

[0053] 4) Put the acid-washed fabric on the mandrel, repeat the dipping and drying process for 3 times, and then release the mold again. During the dipping, the silica sol needs to be vibrated continuously. The dipping process is to place the fabric at a density of 1.13g / cm 3Immersed in the silica sol for 30min, the drying is to dry the im...

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
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Abstract

The present invention discloses a low cost preparation method for a needle punched fabrics reinforced quartz composite ceramic radome. The method comprises the following steps: designing a core mold based on a geometry size of a radome, and punching on the core mold by using quartz cloth and quartz felt through a needle punching method to form a fabric, wherein the profiling structure with the corresponding geometry size is punched on the fabric; carrying out treatments of boiling with boiling water, baking, pickling, repeated impregnation, drying, demolding, repeated impregnation, drying, and heat treatment on the fabric, wherein the fabric is completely ceramized into a blank; carrying out mechanical processing on the blank until a desired product size is achieved, wherein the product is the quartz composite ceramic radome. Practice shows that the radome product cost is substantially reduced by reducing raw material cost and weaving cost and shortening production cycle under circumstances through the method of the present invention, wherein the circumstances comprise that mechanical property and electrical property of materials meet use requirements.

Description

technical field [0001] The invention belongs to the technical field of quartz composite ceramic materials, and in particular relates to a preparation method of a low-cost needle-punched fabric reinforced quartz composite ceramic radome. technical background [0002] With the development of military weapons in the direction of high-end, precision and cutting-edge, the cost of military weapons is getting higher and higher, and the high cost restricts mass production and application. Therefore, reducing the cost of military weapons has become an inevitable trend. In the field of aerospace radome, quartz composite ceramics is the only available wave-transparent and heat-resistant load-bearing material for hypersonic (Ma≥7) missile radome due to its very stable dielectric constant to frequency and temperature and outstanding thermal shock resistance. . At present, the quartz composite ceramic system is quartz fiber braided reinforced quartz, and its matrix is ​​formed by silica ...

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
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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/80C04B35/14C04B35/622
Inventor 张军王芬佘平江张志斌邓德凤
Owner 湖北三江航天江北机械工程有限公司
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