CN107555968A - High-temperature-resistant wave-absorbing wedge and preparation method thereof - Google Patents
High-temperature-resistant wave-absorbing wedge and preparation method thereof Download PDFInfo
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- CN107555968A CN107555968A CN201710761969.4A CN201710761969A CN107555968A CN 107555968 A CN107555968 A CN 107555968A CN 201710761969 A CN201710761969 A CN 201710761969A CN 107555968 A CN107555968 A CN 107555968A
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Abstract
The wave-absorbing wedge comprises a substrate layer and a high-temperature resistance coating which is uniformly coated and sintered on the surface of the substrate layer, wherein the substrate layer is made of alumina or mullite fiber reinforced mullite, and the high-temperature resistance coating is made of Bi2O3‑Al2O3‑SiO2Glass as a binder phase, RuO2Is a conductive phase. The preparation method comprises the following steps: (1) preparing a regular rectangular pyramid substrate layer with a hollow structure by using alumina or mullite fiber reinforced mullite; (2) preparing resistance paste, and printing the resistance paste on the surface of the substrate layer prepared in the step (1) by adopting screen printing; (3) and (3) sintering the substrate layer printed with the resistance paste in the step (2) at a high temperature to obtain the high-temperature-resistant wave-absorbing wedge. The wave-absorbing wedge has excellent broadband wave-absorbing performance, and the wave-absorbing frequency band can cover 2-18 GHz.
Description
Technical field
The invention mainly relates to absorbing material and its preparation technology, and in particular to one kind inhales ripple wedge and preparation method thereof.
Background technology
With the development of the communication technology, stealth technology, l-G simulation test technology and various electronics, microwave dark room and
Absorbing material has obtained rapid development, and is widely used in the fields such as communication, microwave technology, Aero-Space.Along with electronics
Change, information-based fast development, propose higher requirement to the performance of microwave dark room, and the performance of microwave dark room, very big
Depend on inhaling ripple wedge in degree.The need tested with the development of high-power pulsed ion beams and high temperature absorbing material electromagnetic property
Will, higher requirement is proposed to the temperature resistant capability for inhaling ripple wedge.
Currently used to inhale ripple wedge mainly using the polyurethane foamed material for oozing charcoal, such material is organic material, resistance to
Temperature is limited in one's ability, is usually no more than 150 DEG C.There is researcher to do relevant work in terms of suction ripple wedge temperature tolerance is improved.
CN1286474A Chinese patent literatures (application number 00109462.9) disclose a kind of foam glass absorbing material, and it is in foam
Addition mineral material, chemical materials and electromagnetic absorption agent in glass, or absorbent is coated in its bottom surface, make it that there is radar wave
Inhale ripple effect, the glass basis of use is significantly improved with respect to the temperature tolerance of the organic matrixs such as polyurethane, but its 2~
Absorbing property in 18GHz band limits is only capable of reaching -8~-25dB, and absorbing property is poor.CN101985551A China is special
Sharp document (application number 201010259819.1) discloses one kind and zinc powder and manganese dioxide is added in Borosilicate Foam Glass
Absorbing material and preparation method thereof, its temperature tolerance is preferable, but absorbing property is only capable of reaching -7 in 8~13GHz band limits
~-12dB, absorbing property are poor.CN104369498A Chinese patent literatures (application number 20140631078.3) disclose one
The suction ripple wedge kind being made up of fiber-reinforced resin matrix compound material, conductive coating and resinous protective coating layer, its absorbing property compared with
It is good, but temperature tolerance is poor.
From the present situation of ripple wedge is inhaled it can be found that can use at high temperature at present, and be resistant to HIGH-POWERED MICROWAVES spoke
The absorbing material wedge penetrated still belongs to blank.
The content of the invention
The technical problems to be solved by the invention are to overcome the shortcomings of to mention in background above technology and defect, there is provided a kind of
High temperature resistant and the good suction ripple wedge of absorbing property, and a kind of its preparation method is accordingly provided.In order to solve the above technical problems, this hair
The technical scheme of bright proposition is：
A kind of high temperature resistant inhales ripple wedge, and the suction ripple wedge is the positive rectangular pyramid of hollow-core construction, and the suction ripple wedge includes base
Flaggy comes with uniform coating sintering in the high temperature resistant resistance coating of substrate layer surface, the material of the substrate layer for aluminum oxide or not
Mineral wool strengthens mullite, and the high temperature resistant resistance coating is with Bi2O3-Al2O3-SiO2Glass is Binder Phase, with RuO2For conduction
Phase.
Above-mentioned high temperature resistant is inhaled in ripple wedge, it is preferred that a length of a in base of the positive rectangular pyramid, side plate thickness t, side plate
Vertical height be h, wherein, a scope control is 15~40mm, and t scope control is 1~2mm, and h scope control is 100
~400mm.
Above-mentioned high temperature resistant is inhaled in ripple wedge, it is preferred that and the sheet resistance scope control of the high temperature resistant resistance coating is 100~
200Ω/□。
The technical concept total as one, the present invention also provide the preparation method that a kind of above-mentioned high temperature resistant inhales ripple wedge, bag
Include following steps：
(1) the positive rectangular pyramid substrate layer of hollow-core construction is prepared with aluminum oxide or mullite fiber enhancing mullite；
(2) resistance slurry is prepared, is starched using the substrate layer surface printed resistor being prepared in silk-screen printing in step (1)
Material；
(3) the substrate layer high temperature sintering of resistance slurry will be printed in step (2), high temperature resistant is obtained and inhales ripple wedge.
In above-mentioned preparation method, it is preferred that in the step (1), the specific of positive rectangular pyramid substrate layer is prepared with aluminum oxide
Step is as follows：The alumina powder slurry configured is injected in mould using slurry injection technique, demoulding progress is high after drying
Temperature sintering, obtains the positive rectangular pyramid crude green body of hollow alumina, then crude green body is fixed in Special processing tooling, using grinding machine by sky
The positive rectangular pyramid of heart aluminum oxide is machined to required size；The specific of positive rectangular pyramid substrate layer is prepared with mullite fiber enhancing mullite
Step is as follows：Mullite fiber enhancing mullite flat board is prepared using sizing material forming and sintering process first, then according to
Size requirement processes four pieces of triangular panels for inhaling ripple wedge, and is punched on two sides of triangular panels, will have openning hole
Triangular panels be fixed on special tooling surface, four pieces of triangular panels are seamed to one using mullite stitching yarns
It is overall, then using mullite sol as raw material, use multiple sol-gel technology by four pieces of triangular panels machine-shapings for sky
The positive rectangular pyramid shape of the heart, the mullite stitching yarns for finally polishing off surface obtain the mullite fiber enhancing positive rectangular pyramid of mullite
Substrate layer.
In above-mentioned preparation method, it is preferred that in the step (2), the resistance slurry for preparing comprises the following steps：First
Frit powder is well mixed melting, quenching obtains glass dregs in water by the glass melt after fusing, by glass ground-slag
It is broken to obtain glass dust, then by glass dust and RuO2Mixed powder is mixed to get, is finally mixed with mixed powder and organic carrier
To resistance slurry.Detailed process is as follows：
1. glass melting：Bi will be included2O3、Al2O3、SiO2、CaO、MgO、B2O3Frit be well mixed, load platinum
In crucible, then it is placed in batch-type furnace and carries out high melt, the glass melt after fusing is poured into quenching is carried out in deionized water, obtained
To required glass dregs；Preferably, the technological parameter of high melt process is：1400 DEG C~1450 DEG C of smelting temperature, melting are protected
Warm time 1h~3h；
2. glass crushes：Glass dregs obtained above are subjected to ball milling, ball milling carries out in agate jar, using acetone as
Ball-milling medium, after ball milling, drying, sieving, obtain the glass dust of certain particle size；Preferably, the technological parameter of ball milling is：Ball
Material is than (2~3):1, rotational speed of ball-mill 380r/min~450r/min, Ball-milling Time 6h~12h, sieving referred to 200 mesh~400
Mesh sieve；
3. batch mixing：By the glass dust after pulverizing and sieving and RuO2Mixed according to certain mass ratio in planetary gravity mixer
Close uniform；Preferably, the technological parameter of planetary gravity mixer is：Revolution speed 1280rpm~1500rpm, rotational velocity
30~60%, 60~120min of mixing time；
4. slurry rolls：By step, 3. obtained mixed powder is mixed with organic carrier by proportioning, is then ground by three rollers
Machine batch mixing, is prepared resistance slurry；Preferably, organic carrier mainly (is increased by ATBC (solvent), nitrocellulose
Thick dose), form with lecithin (surfactant), its mass percent is respectively：ATBC 80~90%, nitric acid are fine
Dimension element 2~5%, lecithin 5~18%, the main function of organic carrier is dispersion mixing powder, slurry is had printable characteristics；
Preferably, three-roll grinder rotating speed is preferably 250~450r/min, and grinding mixing time is preferably 1~2h.
In above-mentioned preparation method, it is preferred that the mass fraction of constituent is respectively in the frit：
In above-mentioned preparation method, it is preferred that the glass dust and RuO2RuO during mixing2Addition account for glass dust and RuO2
The 49%~55% of gross mass, the addition of mixed powder accounts for mixed powder and organic carrier when the mixed powder mixes with organic carrier
The 75%~80% of gross mass.
In above-mentioned preparation method, it is preferred that in substrate layer surface printed resistor slurry, meshcount is 200 mesh~350
Mesh, the drying temperature of slurry is preferably 150~200 DEG C, and the time is 30~60min.
In above-mentioned preparation method, it is preferred that the resistance slurry viscosity is 140~250pas.
In above-mentioned preparation method, it is preferred that in the step (3), the sintering temperature of the high temperature sintering for 850 DEG C~
1000 DEG C, programming rate is 15~20 DEG C/min, and sintering time is 10min~30min.
In the present invention, it can guarantee that matrix has as the material of matrix using aluminum oxide or mullite fiber enhancing mullite
Higher temperature can also be born while higher force intensity, using ruthenic oxide system glass base resistive coating as high temperature resistant electricity
Resistance coating can ensure that inhaling ripple wedge has the advantage of high temperature resistant and resistance characteristic stabilization.
Compared with prior art, the advantage of the invention is that：
1st, the matrix of suction ripple wedge of the invention is prepared with resistive coating using the excellent material of heat resistance, and electricity
Resistance coating uses the ruthenic oxide system glass base resistive coating with high resistant anti-performance, and the highest of suction ripple wedge in the present invention makes
It can reach more than 1000 DEG C with temperature, there is preferable resistance to elevated temperatures and inoxidizability.
2nd, suction ripple wedge of the invention has Wedge structure with inhaling ripple resistive coating, the two synergy so that the present invention
Suction ripple wedge there is excellent broadband absorbing performance, 2~18GHz can be covered by inhaling wave frequency section.
3rd, the structure of suction ripple wedge of the invention is simple, easily prepared, can prepare different size shape as needed
Ripple wedge is inhaled, is suitable for the demand of different occasions.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
There is the required accompanying drawing used in technology description to be briefly described, it should be apparent that, drawings in the following description are the present invention
Some embodiments, for those of ordinary skill in the art, on the premise of not paying creative work, can also basis
These accompanying drawings obtain other accompanying drawings.
Fig. 1 is the cellular construction dimensional drawing of high temperature resistant absorbing material wedge of the present invention.
Fig. 2 is that hollow alumina inhales ripple wedge photo in the embodiment of the present invention 1.
Fig. 3 is that hollow mullite fiber strengthens mullite suction ripple wedge photo in the embodiment of the present invention 2.
Embodiment
For the ease of understanding the present invention, the present invention is made below in conjunction with Figure of description and preferred embodiment more complete
Face, meticulously describe, but protection scope of the present invention is not limited to embodiment in detail below.
Unless otherwise defined, the implication that all technical terms used hereinafter are generally understood that with those skilled in the art
It is identical.Technical term used herein is intended merely to describe the purpose of specific embodiment, is not intended to the limitation present invention
Protection domain.
Unless otherwise specified, various raw material, reagent, the instrument and equipment etc. used in the present invention can pass through city
Field is commercially available or can be prepared by existing method.
Embodiment 1：
A kind of high temperature resistant absorbing material wedge as shown in Figure 1 and Figure 2, the suction ripple wedge are the positive rectangular pyramid of hollow-core construction,
The suction ripple wedge includes substrate layer with uniform coating sintering in the high temperature resistant resistance coating of substrate layer surface, and substrate layer is using hollow
The positive rectangular pyramid of aluminum oxide, resistive coating think Bi2O3-Al2O3-SiO2Glass is Binder Phase, with RuO2For conductive phase.Positive four rib
The bottom side length a=20mm of cone, side plate thickness t=1.5mm, side plate vertical height h=150mm, the sheet resistance average of resistive coating is about
For 190 Ω/.
The preparation method of the high temperature resistant absorbing material wedge of the present embodiment, comprises the following steps：
(1) preparation of the positive rectangular pyramid substrate layer of hollow alumina：The alumina powder that will have been configured using slurry injection technique
Slurry is injected in mould, and demoulding progress high temperature sintering, obtains the positive rectangular pyramid crude green body of hollow alumina, then by crude green body after drying
It is fixed in Special processing tooling, the positive rectangular pyramid of hollow alumina is machined to by required size using grinding machine；
(2) resistance slurry is prepared：Resistance slurry is with RuO2For conductive phase, with Bi2O3-Al2O3-SiO2Glass is Binder Phase,
The preparation process of resistance slurry includes glass melting, glass crushing, batch mixing, slurry rolling mill practice, specific as follows：
1. glass melting：Bi will be included2O3、Al2O3、SiO2、CaO、MgO、B2O3Frit powder be well mixed, fill
Enter in platinum crucible, then be placed in together in high temperature box furnace, be raised to 1400 DEG C with 20 DEG C/min, 3h be incubated, then, after fusing
Glass melt, which pours into, carries out quenching in deionized water, that is, obtains required glass dregs；
The mass fraction of frit powder in the present embodiment is respectively：
2. glass crushes：The glass dregs that above-mentioned melting is obtained carry out ball milling, and ball milling is carried out in agate jar, with third
Ketone is ball-milling medium, ratio of grinding media to material 2:1, rotating speed 450r/min, Ball-milling Time 8h, 100 DEG C of drying 1h, mistakes after the completion of ball milling
400 mesh sieves, obtain required particle diameter glass dust；
3. batch mixing：By the glass dust after pulverizing and sieving and RuO2Powder is according to 51%, 49% mass ratio planetary heavy
Power stirrer for mixing, the revolution speed of mixer are 1460rpm, rotational velocity 30%, time 120min；
4. slurry rolls：First by ATBC, nitrocellulose and lecithin according to 80:5:15 mass ratio is matched somebody with somebody
Be made organic carrier, then by above-mentioned steps 3. in obtained glass and RuO2Mixed powder presses 75 with organic carrier:25 quality
Than mixing, batch mixing, rotating speed 300r/min are then ground in three-roll grinder, grinding mixing time is 1.5h, obtains resistance slurry
Material, the viscosity of slurry is 220Pas；
(3) the positive rectangular pyramid substrate layer of hollow alumina prepared in step (1) is fixed in special tooling, using 300
The resistance slurry prepared is printed on a face of substrate layer by mesh silk screen using typography, 150 DEG C of dryings in an oven
60min, then printing of the repeat step (3) by each surface resistance slurry of face completing substrate layer；
(4) substrate for the resistance slurry for producing step (3) is placed in batch-type furnace with 15 DEG C/min heating rate
To 850 DEG C of high temperature sintering 10min, the high temperature resistant being prepared in the present embodiment inhales ripple wedge.
The suction ripple wedge array prepared is placed, under the conditions of electromagnetic wave normal incidence, 2~18GHz reflectivity entered
Test is gone, experimental result is as shown in table 1.As shown in Table 1, suction ripple wedge manufactured in the present embodiment has excellent broadband absorbing
Performance.
Table 1：The absorbing property test result of ripple wedge is inhaled in embodiment 1
| Frequency/GHz | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 |
| Reflectivity/dB | -19.52 | -22.51 | -23.06 | -49.68 | -36.82 | -39.33 | -37.93 | -37.71 | -41.22 |
| Frequency/GHz | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | |
| Reflectivity/dB | -33.37 | -41.29 | -37.86 | -33.83 | -31.19 | -50.04 | -34.96 | -32.97 |
Embodiment 2：
A kind of high temperature resistant absorbing material wedge as shown in Figure 1, Figure 3, the suction ripple wedge are the positive rectangular pyramid of hollow-core construction,
The suction ripple wedge includes substrate layer with uniform coating sintering in the high temperature resistant resistance coating of substrate layer surface, and substrate layer is using hollow
Mullite fiber strengthens the positive rectangular pyramid of mullite, and resistive coating thinks Bi2O3-Al2O3-SiO2Glass is Binder Phase, with RuO2For
Conductive phase.The bottom side length a=30mm of the positive rectangular pyramid, side plate thickness t=2mm, side plate vertical height h=300mm, resistive coating
Sheet resistance average be about 150 Ω/.
The preparation method of the high temperature resistant absorbing material wedge of the present embodiment, comprises the following steps：
(1) preparation of the hollow mullite fiber enhancing positive rectangular pyramid substrate layer of mullite：First through sizing material forming and burning
Knot technique prepares mullite fiber enhancing mullite flat board, and four pieces of gores of wedge are then processed according to size requirement
Plate, and punched on two sides of triangular panels, the triangular panels having openning hole are fixed on special tooling surface, using not
Carry out crack of stone yarns and four pieces of triangular panels are seamed to an entirety, then using mullite sol as raw material, using multiple
Four pieces of triangular panels are shaped to hollow rectangular pyramid shape by sol-gel technology, finally polish off the mullite suture on surface
Yarn obtains the hollow mullite fiber enhancing positive rectangular pyramid substrate layer of mullite；
(2) resistance slurry is prepared：Resistance slurry is with RuO2For conductive phase, with Bi2O3-Al2O3-SiO2Glass is Binder Phase,
The preparation process of resistance slurry includes glass melting, glass crushing, batch mixing, slurry rolling mill practice, specific as follows：
1. glass melting：Bi will be included2O3、Al2O3、SiO2、CaO、MgO、B2O3Frit powder be well mixed, fill
Enter in platinum crucible, then be placed in together in high temperature box furnace, be raised to 1450 DEG C with 20 DEG C/min, 1h be incubated, then, after fusing
Glass melt, which pours into, carries out quenching in deionized water, that is, obtains required glass dregs；
The mass fraction of frit powder in the present embodiment is respectively：
2. glass crushes：The glass dregs that above-mentioned melting is obtained carry out ball milling, and ball milling is carried out in agate jar, with third
Ketone is ball-milling medium, ratio of grinding media to material 3:1, rotating speed 400r/min, Ball-milling Time 12h, 100 DEG C of drying 1h after the completion of ball milling,
300 mesh sieves are crossed, obtain required particle diameter glass dust；
3. batch mixing：By the glass dust after pulverizing and sieving and RuO2Powder is according to 49%, 51% mass ratio planetary heavy
Power stirrer for mixing, the revolution speed of mixer are 1280rpm, rotational velocity 45%, time 120min；
4. slurry rolls：First by ATBC, nitrocellulose and lecithin are according to 85:5:10 mass ratio is matched somebody with somebody
Be made organic carrier, then by above-mentioned steps 3. in obtained glass and RuO2Mixed powder presses 80 with organic carrier:20 quality
Than mixing, batch mixing, rotating speed 300r/min are then ground in three-roll grinder, grinding mixing time is 2h, obtains resistance slurry,
The viscosity of slurry is 250Pas；
(3) the hollow mullite fiber enhancing positive rectangular pyramid substrate layer of mullite prepared in step (1) is fixed on special
In frock, the resistance slurry prepared is printed on a face of substrate layer using typography using 200 mesh silk screens, dried
200 DEG C of dry 30min in case, then printing of the repeat step (3) by each surface resistance slurry of face completing substrate layer；
(4) substrate that step (3) is produced to resistance slurry is placed in batch-type furnace with 20 DEG C/min heating rate extremely
1000 DEG C of high temperature sintering 20min, the high temperature resistant being prepared in the present embodiment inhale ripple wedge.
The suction ripple wedge array prepared is placed, under the conditions of electromagnetic wave normal incidence, 2~18GHz reflectivity entered
Test is gone, experimental result is as shown in table 2.As shown in Table 2, suction ripple wedge manufactured in the present embodiment has excellent broadband absorbing
Performance.
Table 2：The absorbing property test result of ripple wedge is inhaled in embodiment 2
| Frequency/GHz | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 |
| Reflectivity/dB | -31.74 | -27.55 | -21.89 | -33.00 | -36.95 | -40.44 | -36.05 | -35.98 | -38.39 |
| Frequency/GHz | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | |
| Reflectivity/dB | -34.28 | -37.39 | -38.00 | -36.23 | -32.39 | -35.55 | -34.69 | -38.19 |
Claims (10)
1. a kind of high temperature resistant inhales ripple wedge, the suction ripple wedge is the positive rectangular pyramid of hollow-core construction, it is characterised in that the suction ripple point
Split including substrate layer and uniform coating sintering in the high temperature resistant resistance coating of substrate layer surface, the material of the substrate layer is oxidation
Aluminium or mullite fiber enhancing mullite, the high temperature resistant resistance coating is with Bi2O3-Al2O3-SiO2Glass is Binder Phase, with
RuO2For conductive phase.
2. high temperature resistant according to claim 1 inhales ripple wedge, it is characterised in that a length of a in base of the positive rectangular pyramid, side
Plate thickness is t, and the vertical height of side plate is h, wherein, a scope control is 15~40mm, and t scope control is 1~2mm, h
Scope control be 100~400mm.
3. high temperature resistant according to claim 1 or 2 inhales ripple wedge, it is characterised in that the side of the high temperature resistant resistance coating
Resistance scope control is 100~200 Ω/.
4. a kind of high temperature resistant as any one of claim 1-3 inhales the preparation method of ripple wedge, it is characterised in that including
Following steps：
(1) the positive rectangular pyramid substrate layer of hollow-core construction is prepared with aluminum oxide or mullite fiber enhancing mullite；
(2) resistance slurry is prepared, using the substrate layer surface printed resistor slurry being prepared in silk-screen printing in step (1)；
(3) the substrate layer high temperature sintering of resistance slurry will be printed in step (2), high temperature resistant is obtained and inhales ripple wedge.
5. preparation method according to claim 4, it is characterised in that in the step (1), positive four rib is prepared with aluminum oxide
Cone substrate layer comprises the following steps that：The alumina powder slurry configured is injected in mould using slurry injection technique, done
The demoulding carries out high temperature sintering after dry, obtains the positive rectangular pyramid crude green body of hollow alumina, crude green body then is fixed on into Special processing tooling
In, the positive rectangular pyramid of hollow alumina is machined to by required size using grinding machine；Positive four are prepared with mullite fiber enhancing mullite
Pyramid substrate layer comprises the following steps that：First using sizing material forming and sintering process prepare mullite fiber enhancing not come
Stone flat board, four pieces of triangular panels for inhaling ripple wedge are then processed according to size requirement, and in two sides of triangular panels
Upper punching, the triangular panels having openning hole are fixed on special tooling surface, using mullite stitching yarns by four pieces of triangles
Panel is seamed to an entirety, then using mullite sol as raw material, using multiple sol-gel technology by four pieces of triangles
Panel machine-shaping is hollow positive rectangular pyramid shape, and the mullite stitching yarns for finally polishing off surface obtain mullite fiber increasing
The positive rectangular pyramid substrate layer of strong mullite.
6. preparation method according to claim 4, it is characterised in that described to prepare resistance slurry bag in the step (2)
Include following steps：Frit is well mixed melting first, by the glass melt after fusing, quenching obtains glass dregs in water,
Glass dregs are crushed to obtain glass dust, then by glass dust and RuO2Mixed powder is mixed to get, finally by mixed powder and organic carrier
It is mixed with to obtain resistance slurry.
7. preparation method according to claim 6, it is characterised in that the mass fraction of constituent in the frit
Respectively：
8. preparation method according to claim 6, it is characterised in that the glass dust and RuO2RuO during mixing2Addition
Amount accounts for glass dust and RuO2The 49%~55% of gross mass, the addition of mixed powder accounts for when the mixed powder mixes with organic carrier
Mixed powder and the 75%~80% of organic carrier gross mass.
9. preparation method according to claim 6, it is characterised in that the resistance slurry viscosity is 140~250pas.
10. preparation method according to claim 4, it is characterised in that in the step (3), the burning of the high temperature sintering
Junction temperature is 850 DEG C~1000 DEG C, and programming rate is 15~20 DEG C/min, and sintering time is 10min~30min.
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| CN201710761969.4A CN107555968B (en) | 2017-08-30 | 2017-08-30 | High-temperature-resistant wave-absorbing wedge and preparation method thereof |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09307268A (en) * | 1996-05-13 | 1997-11-28 | Tohoku Kako Kk | Radio wave absorbing material |
| CN202156067U (en) * | 2011-02-24 | 2012-03-07 | 南京南大波平电子信息有限公司 | Polyurethane foam wedge wave absorbing material |
| CN104369498A (en) * | 2014-11-11 | 2015-02-25 | 中国人民解放军国防科学技术大学 | Composite wave absorbing wedge and preparation method thereof |
| CN106007804A (en) * | 2016-05-18 | 2016-10-12 | 中国人民解放军国防科学技术大学 | Radar wave-absorbing material with high-temperature-resistant and high-impedance surface and preparation method of radar wave-absorbing material |
-
2017
- 2017-08-30 CN CN201710761969.4A patent/CN107555968B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09307268A (en) * | 1996-05-13 | 1997-11-28 | Tohoku Kako Kk | Radio wave absorbing material |
| CN202156067U (en) * | 2011-02-24 | 2012-03-07 | 南京南大波平电子信息有限公司 | Polyurethane foam wedge wave absorbing material |
| CN104369498A (en) * | 2014-11-11 | 2015-02-25 | 中国人民解放军国防科学技术大学 | Composite wave absorbing wedge and preparation method thereof |
| CN106007804A (en) * | 2016-05-18 | 2016-10-12 | 中国人民解放军国防科学技术大学 | Radar wave-absorbing material with high-temperature-resistant and high-impedance surface and preparation method of radar wave-absorbing material |
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|---|---|
| CN107555968B (en) | 2020-03-24 |
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