CN113666728B - Method for preparing quartz composite ceramic antenna housing by coating nano magnetic spheres with PTFE (polytetrafluoroethylene) - Google Patents
Method for preparing quartz composite ceramic antenna housing by coating nano magnetic spheres with PTFE (polytetrafluoroethylene) Download PDFInfo
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- CN113666728B CN113666728B CN202111017468.8A CN202111017468A CN113666728B CN 113666728 B CN113666728 B CN 113666728B CN 202111017468 A CN202111017468 A CN 202111017468A CN 113666728 B CN113666728 B CN 113666728B
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- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
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Abstract
The invention discloses a method for preparing a quartz composite ceramic radome by coating PTFE (polytetrafluoroethylene) with nano magnetic balls, which comprises the steps of putting the PTFE-coated nano magnetic balls and a workpiece into a vacuum impregnation barrel, and sealing the vacuum impregnation barrel; an upper electromagnetic chuck and a lower electromagnetic chuck are respectively arranged at the upper end and the lower end of the vacuum impregnation barrel, and a peripheral electromagnetic chuck is arranged on the outer wall of the vacuum impregnation barrel; the PTFE coated nano magnetic ball accelerates the flow of silica sol, accelerates the compounding of the outer layer cover, shortens the compounding time and improves the working efficiency. The flow of the silica sol can enable the silica sol to fully permeate into the inner pores of the outer layer cover, so that the inner part of the braided body is fully mixed, and the composite uniformity of the product is ensured; and an intelligent operating system can be adopted to control the electromagnetic chuck, manual operation is not needed, labor is saved, and digital production construction is met. The invention solves the problem of low compounding efficiency of the outer layer cover caused by poor fluidity of the silica sol, improves the utilization rate of the silica sol and reduces the loss of raw materials.
Description
Technical Field
The invention belongs to the technical field of efficient densification and composite molding of quartz ceramic materials for aerospace, and particularly relates to a method for preparing a quartz composite ceramic radome.
Background
In a new type missile, the radome provides a good working environment for the head of the missile in a severe flying environment. The outer cover is used as a main body material of the antenna housing and is prepared by an outer cover woven body through the means of compounding, grinding, machining and the like, wherein the compounding is the most important process in the outer cover forming. The outer layer cover is prepared by a sol-gel method, specially-made low-metal ion silica sol is adopted for compounding, the solid content of the silica sol is low, the flowability is poor, the formulated density can be achieved only by compounding for many times, the compounding uniformity is not high every time, the particle size of the silica sol can be changed, the silica sol which can be used for many times can be used only for 1-2 times in the actual compounding process theoretically for ensuring the product performance, and the loss of the compounded raw materials is large.
Because the solid content of the silica sol is low and the fluidity is poor, the outer layer cover needs to be formed by compounding for many times, and the whole compounding and forming needs more than two months, thereby greatly increasing the labor cost and the material cost. Meanwhile, due to the problems of short delivery cycle, high production difficulty and the like of products, a high-efficiency densification composite forming technology is urgently needed to be developed, the composite cycle of the outer cover is shortened, the composite cost is reduced and the product efficiency is improved on the premise of not influencing the densification of the outer cover.
Disclosure of Invention
Aiming at the problems in the background art, the invention aims to provide a method for accelerating the flow of silica sol by using PTFE coated nano magnetic balls and improving the compounding efficiency of a quartz composite ceramic radome.
In order to achieve the purpose, the method for preparing the quartz composite ceramic radome by using the PTFE-coated nano magnetic spheres is characterized by comprising the following steps of:
s1, placing the PTFE-coated nano magnetic ball and the workpiece into a vacuum impregnation barrel, and sealing the vacuum impregnation barrel; an upper electromagnetic chuck and a lower electromagnetic chuck are respectively arranged at the upper end and the lower end of the vacuum impregnation barrel, and a peripheral electromagnetic chuck is arranged on the outer wall of the vacuum impregnation barrel;
s2, heating the silica sol in the silica sol storage barrel in a water bath, and preserving heat;
s3, turning on a vacuum pump to vacuumize the vacuum impregnation barrel, turning on a glue inlet switch between the glue storage barrel and the vacuum impregnation barrel to suck silica sol into the vacuum impregnation barrel from the glue storage barrel, and turning off the glue inlet switch after glue injection is finished;
s4, closing the lower electromagnetic chuck and the peripheral electromagnetic chuck, opening the upper electromagnetic chuck, and continuing for at least 3 minutes, and then, carrying out the next step;
s5, after all the nano-magnetic balls are adsorbed to the upper barrel cover of the vacuum impregnation barrel, closing the upper electromagnetic chuck and the lower electromagnetic chuck, opening the lower electromagnetic chuck, and after at least 3 minutes, carrying out the next step;
s6, after all the nano-magnetic balls are adsorbed to the bottom of the vacuum impregnation barrel, closing the lower electromagnetic chuck, opening the upper electromagnetic chuck and the peripheral electromagnetic chuck, and after at least 3 minutes, carrying out the next step;
and S7, repeating the steps S4 to S6 for at least more than 2 times, closing all the electromagnetic chucks, standing and taking out the workpiece.
Preferably, the suction distance between the upper electromagnetic chuck and the lower electromagnetic chuck is larger than 50cm, and the magnetic field intensity is larger than 3T.
Preferably, the suction distance of the peripheral electromagnetic chuck is more than 30cm, and the magnetic field intensity is more than 3T.
Preferably, in S1, the number of PTFE-coated nanomagnetic spheres placed in the vacuum impregnation tank is 10 7 More than one.
Preferably, in S2, the silica sol in the sol storage barrel is heated to above 50 ℃ in a water bath and is kept warm.
Preferably, in S3, the vacuum pump is turned on for 5 to 15 seconds, and then the suction switch is turned on slowly to evacuate the vacuum impregnation tank.
Preferably, the vacuum meter is observed, when the meter shows-0.09 MPa to-0.1 MPa, the glue inlet switch is opened, and the pressure in the vacuum impregnation barrel is maintained to be-0.09 MPa to-0.1 MPa in the glue inlet process.
Preferably, in S6, the electromagnetic chuck is opened first and then the electromagnetic chuck is opened.
Further preferably, after the upper electromagnetic chuck is opened for at least 1 minute, the lower electromagnetic chuck is opened for at least 1 minute, and then the upper electromagnetic chuck and the lower electromagnetic chuck are synchronously closed, the peripheral electromagnetic chuck is opened for at least 3 minutes. Thus, the PTFE coated nano magnetic ball is ensured to be suspended in the middle of the vacuum impregnation barrel.
The invention has the beneficial effects that: firstly, the flow of silica sol is accelerated by coating the nano magnetic ball with PTFE, the compounding of an outer layer cover is accelerated, the compounding time is shortened, and the working efficiency is improved. Secondly, the silica sol can fully permeate into the inner pores of the outer layer cover due to flowing of the silica sol, so that the inner part of the woven body is fully mixed, and the composite uniformity of the product is ensured; and an intelligent operating system can be adopted to control the electromagnetic chuck, manual operation is not needed, labor is saved, and digital production construction is met.
The invention solves the problem of low compounding efficiency of the outer layer cover caused by poor fluidity of the silica sol, improves the utilization rate of the silica sol and reduces the loss of raw materials.
Drawings
FIG. 1 is a schematic cross-sectional view of the present invention
Detailed Description
The invention will now be described in further detail, including the preferred embodiments, by means of figure 1 and by way of a list of some alternative embodiments of the invention. It is to be understood that the described embodiments are merely a few embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without any inventive step, are within the scope of the present invention.
As shown in fig. 1, the method for preparing the quartz composite ceramic radome by using the PTFE coated nano magnetic spheres comprises the following steps:
1) strong magnetic field design of vacuum impregnation barrel
The upper and lower ends of the vacuum impregnation barrel 1 are respectively provided with an upper electromagnetic chuck 2 and a lower electromagnetic chuck 3, the upper and lower electromagnetic chucks are suspension type electromagnetic chucks, the product suction distance reaches 2 meters, cylindrical peripheral electromagnetic chucks 4 are arranged around the outer wall of the vacuum impregnation barrel 1, and the product suction distance is 1 meter. Preferably, the suction distance between the upper electromagnetic chuck 2 and the lower electromagnetic chuck 3 is more than 50cm, and the magnetic field intensity is more than 3T; the suction distance of the peripheral electromagnetic chuck 4 is more than 30cm, and the magnetic field intensity is more than 3T.
The electromagnetic chuck has strong suction force, and an intelligent operation system is adopted, so that the operation method is simple and easy to master. When the upper electromagnetic chuck 2 is opened, the lower electromagnetic chuck 3 and the peripheral electromagnetic chuck 4 are closed, and similarly, the lower electromagnetic chuck 3 and the peripheral electromagnetic chuck 4 are similar.
2) Vacuum impregnation of silica sol
The appropriate vacuum impregnation vessel 1 was selected according to the size of the outer shell 5, and the silica sol 6 was poured into the storage vessel, examined and recorded once. Heating the silica sol in the silica sol storage barrel to over 50 ℃ in water bath and keeping.
A large amount of PTFE-coated nano magnetic balls 7 are put into the vacuum impregnation barrel 1, and the number of the PTFE-coated nano magnetic balls 7 put into the vacuum impregnation barrel 1 is 10 7 More than one. And after the workpiece is placed on the lifting appliance, the workpiece is gently placed into the vacuum impregnation barrel 1, the vacuum barrel cover is covered, the bolts are uniformly screwed according to a diagonal method, and the sealing surface is required to have uniform clearance and reliable sealing. The PTFE-coated nano magnetic ball 7 belongs to a polytetrafluoroethylene-coated ferroferric oxide nanosphere, belongs to the nano level, and the product gap belongs to the millimeter level, so that the product gap can be penetrated.
After the vacuum pump is started to work, the air exhaust switch is slowly opened to vacuumize the vacuum barrel, and the glue inlet switch is opened to suck the silica sol into the vacuum barrel from the glue containing barrel. When the liquid level of the silica sol in the gel storage barrel continuously drops to the bottom of the barrel, the gel inlet switch is closed. Preferably, the vacuum pump is started to work for 5-15 s, and then the air suction switch is slowly opened to vacuumize the vacuum impregnation barrel.
Observing the vacuum meter, and opening the glue inlet switch when the vacuum meter shows-0.09 MPa to-0.1 MPa, wherein the pressure in the vacuum impregnation barrel is maintained at-0.09 MPa to-0.1 MPa in the glue inlet process. And if the vacuum degree is lower than-0.09 MPa, immediately starting a vacuum pump to pump vacuum until the vacuum degree requirement is met.
The pressure of the vacuum impregnation barrel is improved, after the glue inlet switch is turned on, the silica sol flows into the vacuum impregnation barrel from the glue storage barrel due to the pressure difference between the glue storage barrel and the vacuum impregnation barrel, and the flow rate of the silica sol is controlled by the pressure difference.
3) High-efficiency densification compounding of outer cover
Through intelligent operating system, open last electromagnetic chuck 2, close down electromagnetic chuck 3, all electromagnetic chuck 4, promote PTFE coated nanometer magnetic ball 7 up to move, wait for 3 minutes, wait for after all PTFE coated nanometer magnetic ball 7 all is adsorbed the last bung, close last electromagnetic chuck 2, all electromagnetic chuck 4, open down electromagnetic chuck 3, promote PTFE coated nanometer magnetic ball 7 down to move, wait for 3 minutes, wait for after all PTFE coated nanometer magnetic ball 7 all is adsorbed the bung bottom, close down electromagnetic chuck 3, last electromagnetic chuck 2, open all electromagnetic chuck 4, promote PTFE coated nanometer magnetic ball 7 to the side removal, wait for 3 minutes, the cycle is analogized in proper order. The flow of silica sol is accelerated, the compounding efficiency of the outer layer cover is improved, the compounding uniformity is ensured, and the electrical property of the product is ensured.
Preferably, after the upper electromagnetic chuck is opened for at least 1 minute, the lower electromagnetic chuck is opened for at least 1 minute, and then the upper electromagnetic chuck and the lower electromagnetic chuck are closed synchronously, the peripheral electromagnetic chuck is opened for at least 3 minutes. Thus, the PTFE coated nano magnetic ball is ensured to be suspended in the middle of the vacuum impregnation barrel.
That is, when the PTFE-coated nano magnetic ball 7 is promoted to move upward, the upper electromagnetic chuck 2 is opened, and the lower electromagnetic chuck 3 and the peripheral electromagnetic chuck 4 are not opened; when the PTFE-coated nano magnetic ball 7 is promoted to move downwards, the lower electromagnetic chuck 3 is opened, and the upper electromagnetic chuck 2 and the peripheral electromagnetic chuck 4 are not opened; when promoting PTFE coated nanometer magnetic ball 7 to move to the side, can open last electromagnetic chuck 2 and lower electromagnetic chuck 3 in advance, after a period, close in step last electromagnetic chuck 2 and lower electromagnetic chuck 3 to open all electromagnetic chucks 4, so, guarantee PTFE coated nanometer magnetic ball 7 suspension in the middle of vacuum impregnation bucket 1.
It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and any modification, combination, replacement, or improvement made within the spirit and principle of the present invention is included in the scope of the present invention.
Claims (9)
1. A method for preparing a quartz composite ceramic radome by using PTFE coated nano magnetic spheres is characterized by comprising the following steps:
s1, placing the PTFE-coated nano magnetic ball and the workpiece into a vacuum impregnation barrel, and sealing the vacuum impregnation barrel; an upper electromagnetic chuck and a lower electromagnetic chuck are respectively arranged at the upper end and the lower end of the vacuum impregnation barrel, and a peripheral electromagnetic chuck is arranged on the outer wall of the vacuum impregnation barrel;
s2, heating the silica sol in the silica sol storage barrel in a water bath, and preserving heat;
s3, turning on a vacuum pump to vacuumize the vacuum impregnation barrel, turning on a glue inlet switch between the glue storage barrel and the vacuum impregnation barrel to suck silica sol into the vacuum impregnation barrel from the glue storage barrel, and turning off the glue inlet switch after glue injection is finished;
s4, closing the lower electromagnetic chuck and the peripheral electromagnetic chuck, opening the upper electromagnetic chuck, and continuing for at least 3 minutes, and then, carrying out the next step;
s5, after all the nano-magnetic balls are adsorbed to the upper barrel cover of the vacuum impregnation barrel, closing the upper electromagnetic chuck and the lower electromagnetic chuck, opening the lower electromagnetic chuck, and after at least 3 minutes, carrying out the next step;
s6, after all the nano-magnetic balls are adsorbed to the bottom of the vacuum impregnation barrel, closing the lower electromagnetic chuck, opening the upper electromagnetic chuck and the peripheral electromagnetic chuck, and after at least 3 minutes, carrying out the next step;
and S7, repeating the steps S4 to S6 for at least more than 2 times, closing all the electromagnetic chucks, standing and taking out the workpiece.
2. The method for preparing the quartz composite ceramic radome by using the PTFE-coated nano magnetic spheres as claimed in claim 1, wherein the method comprises the following steps: the suction distance between the upper electromagnetic chuck and the lower electromagnetic chuck is larger than 50cm, and the magnetic field intensity is larger than 3T.
3. The method for preparing the quartz composite ceramic radome by using the PTFE-coated nano magnetic spheres as claimed in claim 1, wherein the method comprises the following steps: the suction distance of the peripheral electromagnetic chuck is more than 30cm, and the magnetic field intensity is more than 3T.
4. The method for preparing the quartz composite ceramic radome by using the PTFE-coated nano magnetic spheres as claimed in claim 1, wherein the method comprises the following steps: in S1, the number of PTFE-coated nano-magnetic balls put into a vacuum impregnation barrel is 10 7 More than one.
5. The method for preparing the quartz composite ceramic radome by using the PTFE-coated nano magnetic spheres as claimed in claim 1, wherein the method comprises the following steps: and S2, heating the silica sol in the glue storage barrel to more than 50 ℃ in a water bath, and preserving the heat.
6. The method for preparing the quartz composite ceramic radome by using the PTFE-coated nano magnetic spheres as claimed in claim 1, wherein the method comprises the following steps: in S3, the vacuum pump is started to work for 5-15S, and then the air extraction switch is slowly opened to vacuumize the vacuum impregnation barrel.
7. The method for preparing the quartz composite ceramic radome by using the PTFE-coated nano magnetic spheres as claimed in claim 6, wherein the method comprises the following steps: observing the vacuum meter, and opening the glue inlet switch when the vacuum meter shows-0.09 MPa to-0.1 MPa, wherein the pressure in the vacuum impregnation barrel is maintained at-0.09 MPa to-0.1 MPa in the glue inlet process.
8. The method for preparing the quartz composite ceramic radome by using the PTFE-coated nano magnetic spheres as claimed in claim 1, wherein the method comprises the following steps: in S6, the electromagnetic chuck is opened first and then the electromagnetic chuck is opened.
9. The method for preparing the quartz composite ceramic radome by using the PTFE-coated nano magnetic spheres as claimed in claim 8, wherein the method comprises the following steps: the upper electromagnetic chuck is opened for at least 1 minute, then the lower electromagnetic chuck is opened for at least 1 minute, and then the upper electromagnetic chuck and the lower electromagnetic chuck are synchronously closed, and then the peripheral electromagnetic chuck is opened for at least 3 minutes.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111017468.8A CN113666728B (en) | 2021-08-30 | 2021-08-30 | Method for preparing quartz composite ceramic antenna housing by coating nano magnetic spheres with PTFE (polytetrafluoroethylene) |
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| CN202111017468.8A CN113666728B (en) | 2021-08-30 | 2021-08-30 | Method for preparing quartz composite ceramic antenna housing by coating nano magnetic spheres with PTFE (polytetrafluoroethylene) |
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| CN110629443B (en) * | 2019-10-21 | 2021-10-01 | 湖北三江航天江北机械工程有限公司 | Shaping method of quartz glass fiber radome fabric |
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