CN105525438B - Boron nitride fiber felt and preparation method thereof - Google Patents
Boron nitride fiber felt and preparation method thereof Download PDFInfo
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- CN105525438B CN105525438B CN201610037988.8A CN201610037988A CN105525438B CN 105525438 B CN105525438 B CN 105525438B CN 201610037988 A CN201610037988 A CN 201610037988A CN 105525438 B CN105525438 B CN 105525438B
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- D—TEXTILES; PAPER
- D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
- D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
- D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
- D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
- D04H1/42—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties characterised by the use of certain kinds of fibres insofar as this use has no preponderant influence on the consolidation of the fleece
- D04H1/4374—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties characterised by the use of certain kinds of fibres insofar as this use has no preponderant influence on the consolidation of the fleece using different kinds of webs, e.g. by layering webs
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- D—TEXTILES; PAPER
- D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
- D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
- D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
- D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
- D04H1/42—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties characterised by the use of certain kinds of fibres insofar as this use has no preponderant influence on the consolidation of the fleece
- D04H1/4209—Inorganic fibres
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- D—TEXTILES; PAPER
- D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
- D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
- D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
- D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
- D04H1/44—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties the fleeces or layers being consolidated by mechanical means, e.g. by rolling
- D04H1/46—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties the fleeces or layers being consolidated by mechanical means, e.g. by rolling by needling or like operations to cause entanglement of fibres
- D04H1/498—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties the fleeces or layers being consolidated by mechanical means, e.g. by rolling by needling or like operations to cause entanglement of fibres entanglement of layered webs
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- D—TEXTILES; PAPER
- D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
- D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
- D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
- D04H1/70—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres characterised by the method of forming fleeces or layers, e.g. reorientation of fibres
- D04H1/74—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres characterised by the method of forming fleeces or layers, e.g. reorientation of fibres the fibres being orientated, e.g. in parallel (anisotropic fleeces)
Abstract
The invention belongs to ceramic fibre material technical fields, and in particular to a kind of boron nitride fiber felt and preparation method thereof.For the boron nitride fiber felt with volume fraction, raw material is as follows：Boron nitride fiber blanket 50~100%；Doped ceramics fiber blanket 0~50%；Continuous ceramic fiber enhances grid 0~50%.The present invention is alternately superimposed, successively needle thorn prepares 0.1~0.5g/cm of bulk density by the volume fraction of three kinds of raw materials of change3Boron nitride fiber Nomex precast body, can as the reinforcement of superhigh temperature anti-yaw damper material, high temperature wave-transparent material, can be used as high temperature heat insulation material, high-temperature-resistant filtering material use；The preparation method is simple for process, ingredient and structure-controllable, it is easy to accomplish large-scale production provides a kind of excellent precast body forming method for the preparation of the materials such as Aeronautics and Astronautics, weaponry field superhigh temperature anti-yaw damper, wave transparent, solar heat protection.
Description
Technical field
The invention belongs to ceramic fibre material technical fields, and in particular to a kind of boron nitride fiber felt and preparation method thereof.
Background technology
Fiber reinforced ceramic matrix composites has the characteristics that good toughness, good thermal shock, anti-yaw damper are had excellent performance, extensively
The sophisticated technology field extremely harsh applied to use conditions such as Aeronautics and Astronautics, electronics, nuclear industry and weaponrys.Current energy
Enough substantially meet the mainly SiO for requiring and being applied2f/SiO2, the composite materials such as Cf/C and Cf/SiC.But with warp
The continuous development of Ji and science and technology, people are higher and higher to the materials demand with more excellent properties.In contrast, it nitrogenizes
The good characteristics such as boron fibre has high temperature resistant, resistant to chemical etching, dielectric properties are excellent, electrical insulating property is good, thermal conductivity is good, it is anti-oxidant
Temperature is more taller than carbon fiber and boron fibre, can for a long time be used in 900 DEG C of oxidizing atmosphere below, and within 2000 DEG C
Crystal grain will not grow up in inert atmosphere, and intensity will not decline.Boron nitride fiber enhancing ceramic matric composite is expected to overcome fibre
The defect of dimension enhancing composite material obtains excellent room temperature and high temperature power, heat, electric comprehensive performance, to solve practical application request.
Currently, since the complexity of boron nitride fiber technology of preparing limits its industrialization large-scale production, the country only has
Only a few unit carries out related subject study, and is almost at the laboratory exploratory stage, causes boron nitride fiber prefabricated
The research report of body formed technology is fewer and fewer.Simultaneously as area possessed by boron nitride fiber special construction and production technology
Not with some characteristics of other ceramic fibres, cause other ceramic fiber prefabrication forming techniques that can not directly apply to boron nitride
Prepared by fiber preform, therefore limit the extensive use of boron nitride fiber enhancing ceramic matric composite.
Invention content
In view of the deficiencies of the prior art, the object of the present invention is to provide a kind of boron nitride fiber felts, can be used as superhigh temperature
The reinforcement of anti-yaw damper material, high temperature wave-transparent material can be used as high temperature heat insulation material, high-temperature-resistant filtering material uses；This hair
Bright while providing preparation method, simple for process, parameter is controllable, it is easy to accomplish large-scale production.
Boron nitride fiber felt of the present invention, with volume fraction, raw material is as follows：
Boron nitride fiber blanket 50~100%；
Doped ceramics fiber blanket 0~50%；
Continuous ceramic fiber enhances grid 0~50%.
The boron nitride fiber felt, with volume fraction, preferably raw material is as follows：
Boron nitride fiber blanket 60~90%；
Doped ceramics fiber blanket 5~30%；
Continuous ceramic fiber enhances grid 5~30%.
The preparation method of the boron nitride fiber felt, includes the following steps：
(1) preparation of boron nitride fiber blanket：Boron nitride fiber is chopped, is combed, boron nitride fiber blanket is obtained；
(2) preparation of doped ceramics fiber blanket：Doped ceramics fiber is chopped, is combed, doped ceramics cellucotton is obtained
Felt；
(3) preparation of continuous ceramic fiber enhancing grid：Continuous ceramic reinforcing fiber is polygonal according to design requirement progress
Degree is laid with, and obtains continuous ceramic fiber enhancing grid；
(4) the needle thorn of fibrofelt：Boron nitride fiber blanket, doped ceramics fiber blanket, continuous ceramic fiber are enhanced into net
Lattice are successively laid with, and D refraction statics felt precast body is prepared into using needling process.
Wherein：
In step (1), the boron nitride fiber length be 30~110mm, a diameter of 5~15 μm.
In step (2), the doped ceramics fiber is one kind or several in quartz fibre, carbon fiber or Zirconium oxide fibre
Kind.
In step (2), the doped ceramics fibre length be 30~110mm, a diameter of 5~15 μm.
In step (3), the continuous ceramic reinforcing fiber is one kind in boron nitride fiber, quartz fibre or carbon fiber
Or it is several.
In step (3), the continuous ceramic fiber enhances a diameter of 5~15 μm of Gitterfasern, per bundle fiber radical 1K
~3K, 5~15mm of fibre bundle spacing.
In step (3), multi-angle laying is specially：
First, it is laid with continuous ceramic reinforcing fiber in one direction on X/Y plane；Then it is spread along with front in X/Y plane
If the fiber direction that forms an angle be laid with one layer of continuous ceramic reinforcing fiber, which can select 30 °, 45 °, 60 °, 75 °
An or angle in 90 °；The fiber that above-mentioned two step is laid with collectively constitutes continuous ceramic fiber enhancing grid, is used for later stage and nitrogen
Change boron fibre blanket and doped ceramics fiber blanket lamination is laid with.
In step (4), 0 °/90 ° angles that are successively laid in are laid with.Described 0 °/90 ° of angles are laid with and are specially：
(being set as 0 ° of direction) is laid with boron nitride fiber blanket in one direction first on X/Y plane；Then in X/Y plane
It is laid with doped ceramics fiber blanket along boron nitride fiber blanket angle in 90 ° (the being set as 90 ° of directions) direction being laid with front；
Finally continuous pottery is laid with along reinforcing fiber blanket angle in 90 ° (the 0 ° of direction the set) direction being laid with front in X/Y plane
Porcelain fiber reinforcement grid.Above step, every layer of structure replace 0 °, 90 ° of layings successively, and being laid with the number of plies can be selected as needed
It selects.
Described 0 °/90 ° of angles are laid with point four kinds of situations：
The first：The boron nitride fiber felt is fine by boron nitride fiber blanket, doped ceramics fiber blanket, continuous ceramics
Dimension enhancing grid is when being made, first (being set as 0 ° of direction) is laid with boron nitride fiber blanket in one direction on X/Y plane,
Then it is laid with doped ceramics fiber blanket (being set as 90 ° of directions) with the boron nitride fiber blanket of laying angle direction in 90 ° again,
Again 0 ° of direction of setting be laid with continuous ceramic fiber enhance grid, according to boron nitride fiber blanket, doped ceramics fiber blanket,
The sequence of continuous ceramic fiber enhancing grid is successively laid with, and the angle being successively laid with is 90 °.
Second：The boron nitride fiber felt by boron nitride fiber blanket, doped ceramics cellucotton felt at when, first
On X/Y plane in one direction (being set as 0 ° of direction) be laid with boron nitride fiber blanket, then again with the boron nitride of laying fibre
Vinylon and cotton blend felt angle direction in 90 ° is laid with doped ceramics fiber blanket (being set as 90 ° of directions), according to boron nitride fiber blanket, mixes
The sequence of miscellaneous ceramic fibre blanket is successively laid with, and the angle being successively laid with is 90 °.
The third：When the boron nitride fiber felt is made of boron nitride fiber blanket, continuous ceramic fiber enhancing grid,
First on X/Y plane in one direction (being set as 0 ° of direction) be laid with boron nitride fiber blanket, then again with the nitridation of laying
Boron fibre blanket angle direction in 90 ° is laid with continuous ceramic fiber enhancing grid (being set as 90 ° of directions), according to boron nitride fiber
Blanket, the sequence of continuous ceramic fiber enhancing grid are successively laid with, and the angle being successively laid with is 90 °.
4th kind：When the boron nitride fiber felt is made of boron nitride fiber blanket, first in X/Y plane upper edge one
A direction (being set as 0 ° of direction) is laid with boron nitride fiber blanket, is then laid with boron nitride fiber cotton in 90 ° of angle directions, according to
90 ° of laying angle is successively laid with.
In step (4), the needling process, 5~40 needles of needling density/cm2, 5~25 layers/10mm of interlayer density；Institute
0.1~the 0.5g/cm of bulk density for the Nomex precast body stated3。
Compared with prior art, beneficial effects of the present invention are as follows：
(1) present invention prepares fibre diameter and volume fraction used in boron nitride fiber felt and can be controlled according to application field
System, realizes the controllability of special construction.
(2) present invention prepared by precast body can as the reinforcement of superhigh temperature anti-yaw damper material, high temperature wave-transparent material,
It can be used as high temperature heat insulation material, high-temperature-resistant filtering material uses.
(3) preparation process of the present invention is simple, ingredient and structure-controllable, it is easy to accomplish large-scale production, be Aeronautics and Astronautics,
The preparation of the materials such as weaponry field superhigh temperature anti-yaw damper, wave transparent, solar heat protection provides a kind of excellent precast body forming method.
Description of the drawings
Fig. 1 is boron nitride fiber felt picture prepared by the present invention.
Specific implementation mode
With reference to embodiment, the present invention will be further described.
All raw materials used in embodiment are purchased in market unless otherwise specified.
Embodiment 1
The boron nitride fiber felt, with volume fraction, raw material is as follows：
Boron nitride fiber blanket 70%；
Quartz fibre blanket 30%.
Preparation method is as follows：
(1) preparation of boron nitride fiber blanket：Boron nitride fiber is chopped, is combed, boron nitride fiber blanket is obtained；It is described
Boron nitride fiber length be 30~50mm, a diameter of 8 μm；
(2) preparation of quartz fibre blanket：Quartz fibre is chopped, is combed, quartz fibre blanket is obtained；The quartz
Fibre length be 30~50mm, a diameter of 5 μm；
(3) the needle thorn of fibrofelt：By 0 ° in the in-plane direction/90 ° angles of boron nitride fiber blanket, quartz fibre blanket by
Layer is laid with, and D refraction statics felt precast body is prepared into using needling process.
5 needles of the needling process needling density/cm2, 10 layers/10mm of interlayer density；Prepared boron nitride fiber needle
Pierce felt precast body 350mm × 300mm × 35mm, bulk density 0.1g/cm3。
Embodiment 2
The boron nitride fiber felt, with volume fraction, raw material is as follows：
Boron nitride fiber blanket 90%；
Fibre reinforced grid 10%.
Preparation method is as follows：
(1) preparation of boron nitride fiber blanket：Boron nitride fiber is chopped, is combed, boron nitride fiber blanket is obtained；It is described
Boron nitride fiber length be 40~90mm, a diameter of 12 μm；
(2) preparation of fibre reinforced grid：Carbon fiber is subjected to multi-angle laying according to design requirement, obtains carbon fiber increasing
Strong grid；A diameter of 15 μm of the fibre reinforced Gitterfasern, per bundle fiber radical 2K, fibre bundle spacing 15mm；
(3) the needle thorn of fibrofelt：By 0 ° in the in-plane direction/90 ° angles of boron nitride fiber blanket, fibre reinforced grid
It is successively alternately laid with, D refraction statics felt precast body is prepared into using needling process.
10 needles of the needling process needling density/cm2, 5 layers/10mm of interlayer density；Prepared boron nitride fiber needle
Pierce felt precast body 200mm × 120mm × 20mm, bulk density 0.3g/cm3。
Embodiment 3
The boron nitride fiber felt, with volume fraction, raw material is as follows：
Boron nitride fiber blanket 75%；
Quartz fibre blanket 15%；
Boron nitride fiber enhances grid 10%.
Preparation method is as follows：
(1) preparation of boron nitride fiber blanket：Boron nitride fiber is chopped, is combed, boron nitride fiber blanket is obtained；It is described
Boron nitride fiber length be 90~110mm, a diameter of 6 μm；
(2) preparation of quartz fibre blanket：Quartz fibre is chopped, is combed, quartz fibre blanket is obtained；The quartz
Fibre length be 90~110mm, a diameter of 10 μm；
(3) preparation of boron nitride fiber enhancing grid：Boron nitride fiber is subjected to multi-angle laying according to design requirement, is obtained
Boron nitride fiber enhances grid；The boron nitride fiber enhances a diameter of 8 μm of Gitterfasern, per bundle fiber radical 1K, fiber
Interfascicular is away from 10mm；
(4) the needle thorn of fibrofelt：By boron nitride fiber blanket, quartz fibre blanket, boron nitride fiber enhancing grid flat
0 °/90 ° angles are successively laid on the direction of face, and D refraction statics felt precast body is prepared into using needling process.
20 needles of the needling process needling density/cm2, 15 layers/10mm of interlayer density；Prepared boron nitride fiber needle
Pierce felt precast body 300mm × 200mm × 40mm, bulk density 0.2g/cm3。
Embodiment 4
The boron nitride fiber felt, with volume fraction, raw material is as follows：
Boron nitride fiber blanket 90%；
Carbon fiber blanket 5%；
Quartz fibre enhances grid 5%.
Preparation method is as follows：
(1) preparation of boron nitride fiber blanket：Boron nitride fiber is chopped, is combed, boron nitride fiber blanket is obtained；It is described
Boron nitride fiber length be 80~100mm, a diameter of 15 μm；
(2) preparation of carbon fiber blanket：Carbon fiber is chopped, is combed, carbon fiber blanket is obtained；The carbon fiber length
For 60~80mm, a diameter of 15 μm；
(3) preparation of quartz fibre enhancing grid：Quartz fibre is subjected to multi-angle laying according to design requirement, is obtained quartzy
Fiber reinforcement grid；The quartz fibre enhances a diameter of 13 μm of Gitterfasern, per bundle fiber radical 2.5K, fibre bundle spacing
5mm；
(4) the needle thorn of fibrofelt：Boron nitride fiber blanket, carbon fiber blanket, quartz fibre are enhanced into grid in plane side
Upward 0 °/90 ° angles are successively alternately laid with, and D refraction statics felt precast body is prepared into using needling process.
25 needles of the needling process needling density/cm2, 18 layers/10mm of interlayer density；Prepared boron nitride fiber needle
Pierce felt precast body 200mm × 150mm × 30mm, bulk density 0.4g/cm3。
Embodiment 5
The boron nitride fiber felt, with volume fraction, raw material is as follows：
Boron nitride fiber blanket 60%；
Carbon fiber blanket 30%；
Quartz fibre enhances grid 10%.
Preparation method is as follows：
(1) preparation of boron nitride fiber blanket：Boron nitride fiber is chopped, is combed, boron nitride fiber blanket is obtained；It is described
Boron nitride fiber length be 55~80mm, a diameter of 11 μm；
(2) preparation of carbon fiber blanket：Carbon fiber is chopped, is combed, carbon fiber blanket is obtained；The carbon fiber length
For 80~100mm, a diameter of 13 μm；
(3) preparation of quartz fibre enhancing grid：Quartz fibre is subjected to multi-angle laying according to design requirement, is obtained quartzy
Fiber reinforcement grid；The quartz fibre enhances a diameter of 13 μm of Gitterfasern, per bundle fiber radical 3K, fibre bundle spacing
8mm；
(4) the needle thorn of fibrofelt：Boron nitride fiber blanket, carbon fiber blanket, quartz fibre are enhanced into grid in plane side
Upward 0 °/90 ° angles are successively alternately laid with, and D refraction statics felt precast body is prepared into using needling process.
40 needles of the needling process needling density/cm2, 20 layers/10mm of interlayer density；Prepared boron nitride fiber needle
Pierce felt precast body 250mm × 150mm × 25mm, bulk density 0.5g/cm3。
Embodiment 6
The boron nitride fiber felt, with volume fraction, raw material is as follows：
Boron nitride fiber blanket 60%；
Zirconium oxide fibre blanket 10%；
Quartz fibre enhances grid 30%.
Preparation method is as follows：
(1) preparation of boron nitride fiber blanket：Boron nitride fiber is chopped, is combed, boron nitride fiber blanket is obtained；It is described
Boron nitride fiber length be 55~80mm, a diameter of 10 μm；
(2) preparation of Zirconium oxide fibre blanket：Zirconium oxide fibre is chopped, is combed, Zirconium oxide fibre blanket is obtained；It is described
Zirconium oxide fibre length be 50~70mm, a diameter of 5 μm；
(3) preparation of quartz fibre enhancing grid：Quartz fibre is subjected to multi-angle laying according to design requirement, is obtained quartzy
Fiber reinforcement grid；The quartz fibre enhances a diameter of 13 μm of Gitterfasern, per bundle fiber radical 1.5K, fibre bundle spacing
12mm；
(4) the needle thorn of fibrofelt：By boron nitride fiber blanket, Zirconium oxide fibre blanket, quartz fibre enhancing grid flat
0 °/90 ° angles are successively alternately laid on the direction of face, and D refraction statics felt precast body is prepared into using needling process.
30 needles of the needling process needling density/cm2, 25 layers/10mm of interlayer density；Prepared boron nitride fiber needle
Pierce felt precast body 250mm × 150mm × 25mm, bulk density 0.3g/cm3。
Claims (3)
1. a kind of boron nitride fiber felt, it is characterised in that：With volume fraction, raw material is as follows：
Boron nitride fiber blanket 60~90%；
Doped ceramics fiber blanket 5~30%；
Continuous ceramic fiber enhances grid 5~30%；
The preparation method of the boron nitride fiber felt, includes the following steps：
（1）The preparation of boron nitride fiber blanket：Boron nitride fiber is chopped, is combed, boron nitride fiber blanket is obtained；
（2）The preparation of doped ceramics fiber blanket：Doped ceramics fiber is chopped, is combed, doped ceramics fiber blanket is obtained；
（3）Continuous ceramic fiber enhances the preparation of grid：Continuous ceramic reinforcing fiber is subjected to multi-angle paving according to design requirement
If obtaining continuous ceramic fiber enhancing grid；
（4）The needle of fibrofelt pierces：By boron nitride fiber blanket, doped ceramics fiber blanket, continuous ceramic fiber enhancing grid by
Layer is laid with, and D refraction statics felt precast body is prepared into using needling process；
Step（2）In, the doped ceramics fiber is one or more of quartz fibre, carbon fiber or Zirconium oxide fibre；
Step（2）In, the doped ceramics fibre length be 30~110mm, a diameter of 5~15 μm；
Step（3）In, the continuous ceramic reinforcing fiber is one kind or several in boron nitride fiber, quartz fibre or carbon fiber
Kind；
Step（3）In, the continuous ceramic fiber enhances a diameter of 5~15 μm of Gitterfasern, per bundle fiber radical 1K~3K,
5~15mm of fibre bundle spacing；
Step（4）In, the needling process, 5~40 needles of needling density/cm2, 5~25 layers/10mm of interlayer density；The needle
Pierce 0.1~0.5g/cm of bulk density of felt precast body3。
2. boron nitride fiber felt according to claim 1 it is characterized in that：Step（1）In, the boron nitride fiber is long
It is 30~110mm to spend, a diameter of 5~15 μm.
3. boron nitride fiber felt according to claim 1, it is characterised in that：Step（4）In, described is successively laid in
0 °/90 ° angles are laid with.
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| CN111716862A (en) * | 2020-05-22 | 2020-09-29 | 宜兴市华恒高性能纤维织造有限公司 | Three-dimensional prefabricated part with needling and superficial sewing functions and preparation method thereof |
| CN115385705B (en) * | 2022-09-30 | 2023-08-18 | 山东工业陶瓷研究设计院有限公司 | Boron nitride fiber mat and preparation method thereof |
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