WO1997029907B1 - Multilayer radome structure and its fabrication - Google Patents
Multilayer radome structure and its fabricationInfo
- Publication number
- WO1997029907B1 WO1997029907B1 PCT/US1997/002272 US9702272W WO9729907B1 WO 1997029907 B1 WO1997029907 B1 WO 1997029907B1 US 9702272 W US9702272 W US 9702272W WO 9729907 B1 WO9729907 B1 WO 9729907B1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- layer
- matrix
- shaping
- cyanate ester
- article
- Prior art date
Links
- 238000004519 manufacturing process Methods 0.000 title 1
- 239000000463 material Substances 0.000 claims abstract 35
- 239000000835 fiber Substances 0.000 claims abstract 20
- 229920001730 Moisture cure polyurethane Polymers 0.000 claims abstract 19
- 239000004643 cyanate ester Substances 0.000 claims abstract 17
- 238000007493 shaping process Methods 0.000 claims abstract 16
- 239000006260 foam Substances 0.000 claims abstract 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract 3
- 229910052904 quartz Inorganic materials 0.000 claims abstract 2
- 239000010453 quartz Substances 0.000 claims abstract 2
- 239000011159 matrix material Substances 0.000 claims 16
- 239000002131 composite material Substances 0.000 claims 13
- 239000002562 thickening agent Substances 0.000 claims 8
- 238000010438 heat treatment Methods 0.000 claims 4
- 230000001419 dependent Effects 0.000 claims 1
- 229920001971 elastomer Polymers 0.000 claims 1
- 239000000806 elastomer Substances 0.000 claims 1
- 238000000034 method Methods 0.000 claims 1
- 229920000311 Fiber-reinforced composite Polymers 0.000 abstract 3
- 239000003733 fiber-reinforced composite Substances 0.000 abstract 3
Abstract
A radome structure has an outer first layer of a fiber-reinforced composite material of quartz fibers in a noncrystalline cured oligomeric cyanate ester prepolymer. A second layer of a syntactic foam underlies and is bonded to the first layer. A third layer of the same fiber-reinforced composite material (although possibly of different thickness) underlines and is bonded to the second layer. A fourth layer of the syntactic foam underlies and is bonded to the third layer. A fifth layer of the same fiber-reinforced composite material (preferably of the same thickness as the first layer) underlies and is bonded to the fourth layer. The structure is formed by layup of the first layer inside a female mold, and successively shaping the remaining layers and tacking them to each preceding layer. The shell produced in this manner can be joined to conforming shells.
Claims
1. An article comprising a multilayer shell, the shell comprising: a first-layer of a first-layer fiber composite material, the first-layer fiber composite material comprising a plurality of first-layer fibers embedded in a first-layer matrix comprising
noncrystalline cured oligomeric cyanate ester
preppolymer; a second layer formed of a second-layer syntactic foam; and a third layer of a third-layer fiber composite material, the third-layer fiber composite material comprising a plurality of
third-layer fibers embedded in a first-layer matrix comprising the cured noncrystalline oligomeric cyanate ester prepolymer, the second-layer being sandwiched between the first layer and the third-layer.
2. The article of Claim 1, wherein the
first-layer fibers and the third-layer fibers are quartz fibers.
3. The article of Claim 1, wherein the
first-layer matrix and the third-layer matrix each further comprise a finely divided thickening agent.
4. The article of Claim 3, wherein the
thickening agent is silica particles.
5. The article of Claim 3, wherein the
thickening agent is present in an amount of from about 2 to about 3 weight percent of the total of thickening agent and pre-polymer.
6. The article of Claim 1, wherein the
second-layer syntactic foam comprises microballoons embedded in a polymeric material.
7. The article of Claim 6, wherein the polymeric material is noncrystalline cured oligomeric cyanate ester pre-polymer.
8. The article of Claim 1, wherein the article further includes: a fourth layer of a fourth-layer syntactic foam; a fifth layer of a fifth-layer fiber composite material, the fifth-layer fiber composite material having a plurality of fifth-layer fibers embedded in a fifth-layer matrix comprising cured noncrystalline oligomeric cyanate ester pre-polymer, the fourth layer being sandwiched between the third layer and the fifth layer.
9. The article of Claim 1, wherein the shell has the shape of a radome.
10. The article of Claim 1, wherein the cured noncrystalline oligomeric cyanate ester pre-polymer is of the following formula:
11. A method for preparing a multilayer shell, the method comprising the steps of :
shaping a first layer of a composite prepreg material comprising fibers embedded in a matrix comprising an oligomeric cyanate ester pre-polymer to the interior of a female mold at a sufficiently slow rate that the material of the first layer is
deformable;
shaping a second layer of a syntactic material comprising a plurality of hollow microballoons embedded in a matrix comprising a pre-polymeric material to the material of the first layer shaped to the interior of the female mold; and
shaping a third layer of a composite prepreg material comprising fibers embedded in a matrix comprising a oligomeric cyanate ester prepolymer to the material of the second layer at a sufficiently slow rate that the material of the third layer is
deformable.
12. A method for preparing a multilayer article, the method comprising the steps of :
shaping a first layer of a composite prepreg material comprising fibers embedded in a matrix
comprising an oligomeric cyanate ester prepolymer and a finely divided thickening agent to an interior portion of a female mold;
shaping a second layer of a syntactic material comprising a plurality of hollow microballoons embedded in a pre-polymer matrix to the material of the first layer;
shaping a third layer of a composite prepreg material comprising fibers embedded in a matrix
comprising an oligomeric cyanate ester prepolymer and a finely divided thickening agent to the material of the first layer; compacting the assembly of layers in the female mold; and
heating the assembly of layers, concurrent with said compacting step, to a temperature sufficient to cure the pre-polymeric material in the assembly and form a multilayer article.
13. The method of Claim 12, wherein said first and third shaping steps are conducted at a sufficiently slow rate to allow the pre-polymeric material to be deformed.
14. The method of Claim 11, including the
additional step, after the step of shaping the third layer, of compacting the assembly of the first, second and third layers.
15. The method of Claims 11 or 12, including the additional steps, after the step of shaping the
third-layer material, of shaping additional layers of material to the third layer of material, the additional layers alternating between layers of syntactic material comprising a plurality of hollow microballoons embedded in a matrix comprising a prepolymeric material and layers of a composite prepreg material comprising fibers embedded in a matrix comprising a oligomeric cyanate ester prepolymer.
16. The method of Claims 11, 12 or 15, wherein the layers of syntactic material comprise an oligomeric cyanate ester pre-polymer.
17. The method of Claims 11 or 12, wherein the step of shaping a first layer of material to a female mold comprises shaping a first layer of material to a female mold having an interior whose shape corresponds to an exterior shape of a radome shell.
18. The method of Claim 11, wherein the steps of shaping a first layer and a third layer of a composite prepreg material comprises providing fibers embedded in a matrix comprising an oligomeric cyanate ester pre- polymer and a finely divided thickening agent.
19. The method of Claims 11 or 12, wherein the steps of shaping a second layer of a syntactic material comprises providing a second layer comprising a
plurality of hollow microballoons embedded in a matrix comprising a pre-polymeric material and a finely divided thickening agent.
20. The method of Claims 11 or 12, wherein the oligomeric cyanate ester prepolymer of the first and third layers has a viscosity of greater than 106 centipoise at ambient temperature.
21. The method of Claims 11 or 12, wherein the oligomeric cyanate ester prepolymer of the first and third layers has an apparent glass-transition
temperature of from about 40°F to about 60°F.
22. The method of Claims 11 or 12, further comprising the step of locally heating the prepolymer material of the first, second and third layers, simultaneous with said shaping steps, to a temperature sufficiently high to render the prepolymeric material tacky.
23. The method of Claim 12, wherein said step of heating comprises heating the assembly in a multistage process.
24. The method of Claims 11 or 12, wherein the steps of providing a first layer and a third layer of a composite prepreg material comprises providing fibers embedded in a matrix comprising an oligomeric cyanate ester prepolymer, at least a portion of which is mixed with a colloidally dispersed elastomer.
STATEMENT UNDER ARTICLE 19
This statement is also submitted to explain the reasons for the accompanying Article 19 Amendments. Newly added Claim 10 is dependent on Claim 1 and includes the further recitation of a particular genus of noncrystaline cured oligomaric cyanate ester prepolymers for use in the invention. Claims 11-24 have been added to provide more adequate protection of the present invention. In particular, Claimβ 11-24 describe a method for preparing a multilayer shell according to the invention.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AU21236/97A AU2123697A (en) | 1996-02-16 | 1997-02-13 | Multilayer radome structure and its fabrication |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US08/602,900 | 1996-02-16 | ||
| US08/602,900 US5707723A (en) | 1996-02-16 | 1996-02-16 | Multilayer radome structure and its fabrication |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| WO1997029907A1 WO1997029907A1 (en) | 1997-08-21 |
| WO1997029907B1 true WO1997029907B1 (en) | 1997-10-16 |
Family
ID=24413235
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/US1997/002272 WO1997029907A1 (en) | 1996-02-16 | 1997-02-13 | Multilayer radome structure and its fabrication |
Country Status (3)
| Country | Link |
|---|---|
| US (2) | US5707723A (en) |
| AU (1) | AU2123697A (en) |
| WO (1) | WO1997029907A1 (en) |
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| GB201204690D0 (en) | 2012-03-16 | 2012-05-02 | Jaguar Cars | Composite moulding techniques |
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| US9914803B2 (en) | 2013-06-28 | 2018-03-13 | Saint-Gobain Performance Plastics Corporation | Cyanate resin blends and radomes including them |
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| US11201384B2 (en) | 2018-01-26 | 2021-12-14 | Pulse Finland Oy | Methods and apparatus for the mounting of antenna apparatus |
| US20200223105A1 (en) * | 2019-01-15 | 2020-07-16 | Mark V. Wasson | Method for prototyping and manufacturing high-contour structures of oriented thermoplastics and oriented thermoplastic composites |
| CA3125118A1 (en) * | 2018-12-27 | 2020-07-02 | Saint-Gobain Performance Plastics Corporation | Wideband radome design |
| CN110571522A (en) * | 2019-03-21 | 2019-12-13 | 成都形水科技有限公司 | broadband millimeter wave antenna housing and preparation method thereof |
| CN111740211A (en) * | 2019-03-25 | 2020-10-02 | 华为技术有限公司 | Antenna housing and base station antenna |
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| CN114204269B (en) * | 2021-10-21 | 2023-09-29 | 西安邮电大学 | Light composite material logarithmic periodic antenna and manufacturing method thereof |
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| CN114311702A (en) * | 2021-12-22 | 2022-04-12 | 山东工业陶瓷研究设计院有限公司 | Method for forming moisture-proof layer of antenna housing |
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-
1996
- 1996-02-16 US US08/602,900 patent/US5707723A/en not_active Expired - Lifetime
-
1997
- 1997-02-13 AU AU21236/97A patent/AU2123697A/en not_active Abandoned
- 1997-02-13 WO PCT/US1997/002272 patent/WO1997029907A1/en active Application Filing
- 1997-07-15 US US08/893,208 patent/US5849234A/en not_active Expired - Lifetime
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