CN1291077C - Silicon carbonate fiber bundle with different sections and manufacture thereof - Google Patents
Silicon carbonate fiber bundle with different sections and manufacture thereof Download PDFInfo
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- CN1291077C CN1291077C CN 200510031149 CN200510031149A CN1291077C CN 1291077 C CN1291077 C CN 1291077C CN 200510031149 CN200510031149 CN 200510031149 CN 200510031149 A CN200510031149 A CN 200510031149A CN 1291077 C CN1291077 C CN 1291077C
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- silicon carbide
- multiform
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Abstract
The present invention discloses a multiform silicon carbide fiber bundle and a preparation method thereof. A skin layer of the fiber bundle is formed by 20 to 80 roots of circular silicon carbide fibers, a sandwich layer is formed by 40 to 150 roots of silicon carbide fibers with profiled cross sections, and the profiled silicon carbide fibers are one or a plurality of kinds of the silicon carbide fibers with profiled cross sections, such as trilobal cross sections, C-shaped cross sections, strip-shaped cross sections, cinquefoil-shaped cross sections, etc. Precursor body poly carbon silicon alky of which the softening point is from 190 to 230 DEG C is used as a raw material, the same plate multiform spinneret plate is used for melt spinning, and the multiform silicon carbide fiber bundle is prepared through nonmelt treatment and continuous firing technology. The present invention has the advantages that the profiled degree of the profiled fibers is high; the magnetic loss is about zero, and the dielectric loss tangent value is tan delta=0.3 to 1.3 in an X waveband; a real part value and an imaginary part value of a dielectric coefficient is reduced along with the increase of frequency, and the frequency response effect is good; the continuous length is larger than 500m, and the cost is saved.
Description
Technical field
The present invention relates to a kind of silicon carbonate fiber bundle with different sections and preparation method thereof, especially relate to a kind of silicon carbonate fiber bundle with different sections and preparation method thereof that is particularly suitable for as the reinforcing agent of composites such as fiber-reinforced resin, fiber reinforced ceramic, fibreglass-reinforced metal.
Background technology
The resistivity of the circular SiC fiber that general employing precursor conversion method makes is 10
6About Ω .cm, dielectric loss and magnetic loss are all less, are electromagnetic electromagnetic wave transparent materials; The circular fiber of trilobal SiC fiber and identical equivalent diameter relatively, it is about 30% that monofilament tensile strength improves, resistivity reduces, 10
4About Ω .cm, in the 8-18GHz scope, has certain absorbing property; The dielectric loss tangent value of C shape SiC fiber is about 0.7, and resistivity is 10
4About Ω .cm, be dielectric loss type absorbing material.
Summary of the invention
The object of the present invention is to provide the impedance matching of a kind of impedance and free space better, silicon carbonate fiber bundle with different sections that absorbing property is more good and preparation method thereof.
Technical scheme of the present invention is as follows:
Silicon carbonate fiber bundle with different sections of the present invention is formed cortex by 20～80 (preferred 30～60) circular silicon carbide fibres, form sandwich layer by 40～150 (preferred 60～120) odd-shaped cross section silicon carbide fibres, described special-shaped silicon carbide fibre can be a kind of in trilobal, C shape, bar shaped, the five odd-shaped cross section silicon carbide fibres such as leaf or several.The ratio of above-mentioned different shape silicon carbide fibre and fiber number can be according to the technological requirements of known precursor Polycarbosilane spinning, regulate by the ratio and the size that change various holes during the design spinnerets.
Its preparation method comprises the steps: (1) design with plate multiform spinnerets, and the single hole flow-rate ratio that requires various holes is between 1～3; (2) be raw material with precursor Polycarbosilane (PCS) than high softening-point (190～230 ℃), employing is with plate multiform spinnerets, described Polycarbosilane is placed melt spinning device, under the high pure nitrogen protection, be heated to 300～400 ℃, after carrying out the deaeration processing, at 250～320 ℃, carry out melt spinning with 100～600m/min speed, make with bundle multiform Polycarbosilane fibrillation; (3) above-mentioned fibrillation is placed oxidation furnace, in oxidizing atmosphere,, and, be incubated 3～6 hours, do not melted with restrainting the multiform polycarbosilane fiber after being chilled to room temperature at 190～240 ℃ according to the heating of certain temperature increasing schedule; (4) above-mentioned fusion-free fibre is placed high temperature furnace under the high pure nitrogen protection, be warming up to 1200～1450 ℃, and under this temperature, burn till continuously, obtain silicon carbonate fiber bundle with different sections.The silicon carbonate fiber bundle with different sections that makes can be collected on the silk bucket by coiler device.
The present invention has following good effect: the filament strength of different shape fiber is more or less the same; The degree of profile of profiled filament is higher; At X-band, magnetic loss is about zero; The dielectric loss tangent value is tan δ=0.3～1.3; The real part of dielectric constant and imaginary values reduce with the increase of frequency, and frequency response effect is good; Continuous length is greater than 500m; Utilize the same plate multiform spinnerets of design, obtain the regularly arranged silicon carbide fibre bundle of various cross sectional shapes, do not need the fiber of different shape is processed through network, save manufacturing cost, reduced the damage that causes in the different shape network of fibers process.
Description of drawings
Fig. 1 is the cross sectional representation of silicon carbonate fiber bundle with different sections one embodiment of the present invention;
Fig. 2 is the cross sectional representation of another embodiment of silicon carbonate fiber bundle with different sections of the present invention.
The specific embodiment
The invention will be further described by the following examples.
Embodiment 1.
With reference to Fig. 1, present embodiment is made up of with the cortex 1 of restrainting the multiform fiber 30 circular silicon carbide fibres, is made up of with bundle multiform fiber sandwich layer 3 51 trilobal silicon carbide fibres 2.Described filament strength with fiber in the bundle multiform fiber is 1.8Gpa～2.0GPa, and the degree of profile of trefoil fiber is 0.80～0.90, and the continuous length of the described multiform of bundle together fiber is greater than 500m.In the present embodiment, X-band, the portion of the magnetic conductivity of described fiber is about 1, and imaginary part is about 0, and the dielectric loss tangent value is 0.3-1.3, and dielectric constant reduces with the variation of frequency, has Frequency Response preferably.
Its concrete preparation method: softening point 204-214 ℃ precursor Polycarbosilane is placed melt spinning device; employing is with plate multiform spinnerets (single hole flow-rate ratio 1.5); under high pure nitrogen protection, be heated to 350 ℃ and carry out deaeration and handle after; at 285 ℃; spinning speed melt spinning with 500m/min; the diameter that obtains circular precursor is 15 μ m, and the equivalent diameter of trilobal precursor is 21 μ m.Precursor is placed oxidation furnace, and the programming rate by 12 ℃/h in air atmosphere is heated to 200 ℃, and insulation was handled 4 hours.It is 1300 ℃ high temperature firing furnace that fusion-free fibre is placed temperature, under the high pure nitrogen protection, burns till continuously, makes silicon carbonate fiber bundle with different sections.
Embodiment 2.
With reference to Fig. 2, present embodiment is formed silicon carbonate fiber bundle with different sections sandwich layer 3 by 4,67 trilobal silicon carbide fibres 2 of 28 C shape silicon carbide fibres, forms silicon carbonate fiber bundle with different sections cortex 1 by 40 circular silicon carbide fibres.Described filament strength with fiber in the bundle multiform fiber is 1.60GPa-2.0GPa, and the degree of profile of trefoil fiber is between 0.70-0.90, and the degree of profile of C shape fiber is about 0.12.The continuous length of the described multiform of bundle together fiber is greater than 500m.In the present embodiment, X-band, the real part of the magnetic conductivity of described fiber is about 1, and imaginary part is about 0, and the dielectric loss tangent value is 0.6～1.3.
Its concrete preparation method: get 50g precursor Polycarbosilane (softening point 207-220 ℃) and place melt spinning device; employing is with plate multiform spinnerets (single hole flow-rate ratio 2.5); under high pure nitrogen protection, be heated to 350 ℃ and carry out deaeration and handle after; at 292 ℃; spinning speed melt spinning with 400m/min; the diameter that obtains circular precursor is 20 μ m, and the equivalent diameter of trilobal precursor is 21 μ m, the equivalent diameter 30 μ m of C shape precursor.Precursor is placed oxidation furnace, and the programming rate by 10 ℃/h in air atmosphere is heated to 210 ℃, and insulation was handled 4 hours.It is 1350 ℃ high temperature firing furnace that fusion-free fibre is placed temperature, under the high pure nitrogen protection, burns till continuously and makes silicon carbonate fiber bundle with different sections.
Claims (4)
1, a kind of silicon carbonate fiber bundle with different sections is characterized in that, its cortex is made up of the circular silicon carbide fibre of 20-80 root, and sandwich layer is made up of 40-150 root odd-shaped cross section silicon carbide fibre.
2, silicon carbonate fiber bundle with different sections according to claim 1 is characterized in that, its cortex is made up of the circular silicon carbide fibre of 30-60 root, and sandwich layer is made up of 60-120 root odd-shaped cross section silicon carbide fibre.
3, silicon carbonate fiber bundle with different sections according to claim 1 and 2 is characterized in that, described special-shaped silicon carbide fibre is a kind of in trilobal, C shape, bar shaped, the five leaf odd-shaped cross section silicon carbide fibres or several.
4, according to the preparation method of claim 1 or 2 or 3 described silicon carbonate fiber bundle with different sections, it is characterized in that, comprise the steps:
(1) design is with plate multiform spinnerets, and the single hole flow-rate ratio in various holes is between 1-3;
(2) be that 200-230 ℃ precursor Polycarbosilane is a raw material with the softening point, employing is with plate multiform spinnerets, described Polycarbosilane is placed melt spinning device, under the high pure nitrogen protection, be heated to 300-400 ℃, after carrying out the deaeration processing, at 260-320 ℃, carry out melt spinning with 200-600m/min speed, make with bundle multiform Polycarbosilane fibrillation;
(3) place oxidation furnace with described with bundle multiform Polycarbosilane fibrillation, in oxidizing atmosphere,, and, be incubated 4-6 hour, do not melted with restrainting the multiform polycarbosilane fiber after being chilled to room temperature at 200-230 ℃ according to the programming rate heating of 8-15 ℃/h;
(4) described the fusing with bundle multiform polycarbosilane fiber do not placed high temperature furnace under the high pure nitrogen protection, be warming up to 1200-1400 ℃, and under this temperature, burn till continuously, obtain silicon carbonate fiber bundle with different sections.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510031149 CN1291077C (en) | 2005-01-17 | 2005-01-17 | Silicon carbonate fiber bundle with different sections and manufacture thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510031149 CN1291077C (en) | 2005-01-17 | 2005-01-17 | Silicon carbonate fiber bundle with different sections and manufacture thereof |
Publications (2)
| Publication Number | Publication Date |
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| CN1644770A CN1644770A (en) | 2005-07-27 |
| CN1291077C true CN1291077C (en) | 2006-12-20 |
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| CN 200510031149 Expired - Fee Related CN1291077C (en) | 2005-01-17 | 2005-01-17 | Silicon carbonate fiber bundle with different sections and manufacture thereof |
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Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103184566A (en) * | 2011-12-31 | 2013-07-03 | 新乡化纤股份有限公司 | Shaped porous spinneret |
| CN102851759A (en) * | 2012-08-01 | 2013-01-02 | 张家港市恒美纺织有限公司 | Spinneret plate for spinning |
| CN102808240A (en) * | 2012-08-27 | 2012-12-05 | 中国科学院化学研究所 | Preparation method of high-temperature-resistant silicon carbide fiber |
| CN103866408A (en) * | 2012-12-12 | 2014-06-18 | 蒋春花 | Spinneret plate |
| CN103866409A (en) * | 2012-12-12 | 2014-06-18 | 蒋春花 | Spinneret plate for filament wool-like production of spinning pack |
| CN103866412A (en) * | 2012-12-13 | 2014-06-18 | 上海启鹏工程材料科技有限公司 | Spinneret needle |
| CN103707390B (en) * | 2013-12-20 | 2015-11-11 | 厦门大学 | The preparation method of a kind of ceramics springs shaped device and ceramics springs |
| CN103981584A (en) * | 2014-06-04 | 2014-08-13 | 徐伯琴 | Hollow special-shaped composite spinneret plate |
| CN105483883A (en) * | 2016-01-28 | 2016-04-13 | 江苏中石纤维股份有限公司 | Same-bundle heterogeneous polyethylene/polyester composite fiber for wiping |
| CN106948031A (en) * | 2017-05-04 | 2017-07-14 | 中国人民解放军国防科学技术大学 | The preparation method of ultra-fine tow silicon carbide fibre |
| CN108004606A (en) * | 2018-01-18 | 2018-05-08 | 绍兴九洲化纤有限公司 | A kind of preparation method of imitative silk poly butylene succinate emulation long filament |
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| CN1644770A (en) | 2005-07-27 |
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Granted publication date: 20061220 Termination date: 20100219 |