CN103835067A - Quasi-three dimensional prefabricated member - Google Patents
Quasi-three dimensional prefabricated member Download PDFInfo
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- CN103835067A CN103835067A CN201410092438.7A CN201410092438A CN103835067A CN 103835067 A CN103835067 A CN 103835067A CN 201410092438 A CN201410092438 A CN 201410092438A CN 103835067 A CN103835067 A CN 103835067A
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Abstract
The invention discloses a quasi-three dimensional prefabricated member. The quasi-three dimensional prefabricated member comprises a non-weft fabric and a net tire alternative laminate, wherein continuous needling permeation is conducted on a plurality of fixed layers of the non-weft fabric and the net tire alternative laminate through a bidirectional feeding needle machine in the vertical direction, the adjacent layers are connected through vertical fibers generated between the layers, the quasi-three dimensional prefabricated member of a carbon fiber whole structure is obtained, and the volume density of the quasi-three dimensional prefabricated member ranges from 0.45 g/cm<3> to 0.70 g/cm<3>. The quasi-three dimensional prefabricated member reduces the number of carbonization technologies and avoids deformation caused by contraction of long and short fibers and coking caused by uneven density in a carbonization process; the internal structure and hole distribution of the quasi-three dimensional prefabricated member are optimized; base carbon is easily adsorbed and borne in a CVD process, and friction and abrasion resistant performance, and heat conducting performance, tensile strength and shearing strength in the vertical direction of a carbon brake disc of an airplane are greatly enhanced. The Z-direction longitudinal reinforced fiber content of the quasi-three dimensional prefabricated member is improved, and consistency of density among the layers is controlled effectively.
Description
Technical field
The invention provides a kind of quasi three-dimensional prefab, the integrally-built quasi three-dimensional prefab of especially a kind of carbon fiber, is specially adapted to Direct precipitation carbon subsequently and is machined for the C/C structural material of airplane carbon brake disc.
Background technology
Aircraft carbon brake is the strong friction material of a kind of circular superelevation, English, U.S., method three states have just started the exploitation to aircraft carbon brake material as far back as mid-term nineteen sixties, in reinforcing material performance and production technology, update and improve, to the early 1980s, only have B.F.Goodrich company of the U.S., Goodyer company, Honeywell company, Dunlop company of Britain and French Messier-Bugatti company to provide airplane carbon brake disc for Boeing, Airbus SAS.The prefabricated component technology of airplane carbon brake disc mainly comprises pre-oxidized fibers acupuncture prefabricated component technology, carbon fiber continuous fiber knitting skill, carbon fiber staple fiber and resin or pitch compound thermal molded curing technology.Prepare various high-performance C/C composites, all need first to prepare charcoal fibre three-dimensional prefabricated component, charcoal fibre three-dimensional prefabricated component refers to that X all has the structural strength of expectation to, Y-direction, Z-direction.
Pre-oxidized fibers acupuncture prefabricated component technology is mainstream technology in the world at present, comprises preoxidized polyacrylonitrile long fiber (PANOF) and the short folded three dimensional fabric that forms of pre-oxidized polyacrylonitrile fiber (PANOF) net plies of cutting, through technical process such as acupuncture, carbonizations.But the prefabricated component that pre-oxidized polyacrylonitrile fiber (PANOF) is made must carry out carbonation process and be converted into carbon fiber structural.Pre-oxidized polyacrylonitrile fiber thermal conductivity factor is low, carbonization poor controllability, technology difficulty large, high to equipment and technological requirement, and pre-oxidation prefabricated component is in high temperature cabonization process, the long and short fiber of prefabricated component inside produces different stress and wriggles and cause overall shrinkage distortion, easily layering; Also easily cause coking if control bad technique in carbonisation, be combined into the place of concentrating after C/C composite and easily form inhomogeneous low density area, the friction and wear behavior uniformity of the each aspect of final products is had to certain influence.And in carbonisation, discharge a large amount of volatile poisonous crystalline solid of white hydrogen cyanide amine with sharp aroma, operator and environment are affected.
Carbon fiber continuous fiber knitting skill is to utilize polyacrylonitrile-radical long carbon fiber (PANCF) to weave the flat fabric forming, be stacked to required certain thickness, then carry out resin or bituminizing hot moulding and solidify, through carbonization technique, rely on carbonisation resin carbon or RESEARCH OF PYROCARBON bonding.This technology connects because vertical direction does not have fiber, purely relies on resin carbon or RESEARCH OF PYROCARBON in carbonisation next bonding, the face that the flies carbon brake disc of making, vertical direction mechanics performance can be very not high, thermal conductivity factor also can be under some influence, if technology controlling and process is bad, and the easy layering of product.Plane (X, Y-direction) adopts expensive 1K and 3K carbon fiber to make conventionally, complex procedures, and fabrication cycle is long, fiber utilization rate is low, cost is high.
Carbon fiber staple fiber and resin or pitch compound thermal molded curing technology adopt polyacrylonitrile-radical chopped carbon fiber (PANCF) and resin compounded hot moulding curing technology, carrying out resin or bituminizing hot moulding by polyacrylonitrile-radical chopped carbon fiber solidifies, through carbonization technique, rely on carbonisation resin carbon or RESEARCH OF PYROCARBON bonding.The major defect that this technology exists and the major defect of carbon fiber continuous fiber knitting skill are similar.
Summary of the invention
The object of the invention is to overcome above-mentioned the deficiencies in the prior art, provides a kind of little to X, Y-direction fibre damage, and on plane performance, substantially without impact, and the introducing of Z-direction fiber is easy, and Z-direction reinforced fiber content is high, the quasi three-dimensional prefab of interlayer consistent in density.
The object of the invention is to be achieved through the following technical solutions:
A kind of quasi three-dimensional prefab, it comprises laid fabric and net tire alternative stacked, the some fixing levels of vertical direction continuous needle infiltration through two-way feeding needing machine in laid fabric and net tire alternative stacked, produce vertical direction fiber at interlayer and connect adjacent some layers, make the integrally-built quasi three-dimensional prefab of a kind of carbon fiber, the bulk density of described quasi three-dimensional prefab is 0.45～0.70g/cm
3.
Of the present invention can acupuncture laid fabric, be thickness 0.15～0.3mm, the surface density 20～300g/m being made by the radially superimposed acupuncture of polyacrylonitrile-radical long carbon fiber
2thin layer laid fabric, described laid fabric is conducive to follow-up acupuncture and obtains the permanent Z-direction fiber shifting.
Net tire of the present invention, be by polyacrylonitrile-radical chopped carbon fiber through steam or chemical handling flexibly, mechanical shredding, be carded to thickness 0.15～0.3mm, surface density 20～300g/m
2thin type net felt fabric.The length of described polyacrylonitrile-radical chopped carbon fiber is 60～90mm.
Polyacrylonitrile-radical chopped carbon fiber steam treatment is: polyacrylonitrile-radical chopped carbon fiber adds moisture to make to keep chopped carbon fiber to keep 40～70% humidity, and 25～30 DEG C are incubated 1～5 hour.
The mechanical shredding of polyacrylonitrile-radical chopped carbon fiber of the present invention is to utilize transmission system, along single roller opener roll axial direction, forms " S " type cloth pin mode, has reached little to the fibre damage of shredding, the better object of laxity.
Net tire of the present invention, after steam or chemical flexible modification, shredding are processed, strengthen the flexibility of chopped carbon fiber, and in net process, make it to produce certain holding, net the form of the foetus formula has the porous of random distribution, not only, for follow-up carbon deposition provides sufficient space, be conducive to the more charcoals of deposition, improved C/C complex carbon residue; And deposition C-structure distribution performance is good, be conducive to improve the overall performance of making material.
Between laid fabric, lay net tire, described adjacent laid fabric interlayer preferably, with the staggered laying of 0 degree/90 degree angle, is conducive to save material.
Described needling density 30～50 pins/cm
2.
10～25 layers/cm of interlayer density of described quasi three-dimensional prefab.The thickness of described quasi three-dimensional prefab is 10～400mm.
Vertical direction (Z-direction) fiber content 25%～55% of described quasi three-dimensional prefab.
A preparation method for quasi three-dimensional prefab, is characterized in that: the method comprises the following steps:
(1) the thickness 0.15～0.3mm, the surface density 20～300g/m that, are made by the radially superimposed acupuncture of polyacrylonitrile-radical long carbon fiber
2laid fabric; By polyacrylonitrile-radical chopped carbon fiber through steam or chemical handling flexibly, mechanical shredding, be carded to thickness 0.15～0.3mm, surface density 20～300g/m
2net tire;
(2), laid fabric and net tire alternative stacked, control adjacent laid fabric interlayer with the staggered laying of 0 degree/90 degree angle;
(3) the some fixing levels of vertical direction continuous needle infiltration, through two-way feeding needing machine in laid fabric and net tire alternative stacked, needling density 30～50 pins/cm
2, produce vertical direction fiber at interlayer and connect adjacent some layers, making bulk density is 0.45～0.70g/cm
3, 10～25 layers/cm of interlayer density the integrally-built quasi three-dimensional prefab of carbon fiber.
Described two-way feeding needing machine, comprise frame, be located at the motor of frame top, needle beam, needle plate, stripping web plate, corresponding to the holder web plate of below of stripping web plate, for controlling the Worm gear feed screw Lift Part of holder web plate lifting, by bearing, horizontal rotating shaft is installed at upper rack described, horizontal rotating shaft by belt by Motor Drive, two bidirectional cams are installed in the horizontal rotating shaft left and right sides, corresponding to described bidirectional cam below, the first two-way guide pillar is installed, the first two-way guide pillar contacts with corresponding bidirectional cam, needle beam is fixed under the first two-way guide pillar, be positioned at two bidirectional cam outsides at horizontal rotating shaft and be also provided with two the second two-way guide pillars, the second two-way guide pillar lower end is provided with oil cylinder, described oil cylinder and stripping web plate are fixed, be provided with in the both sides of correspondence holder web plate horizontal plane and feed to curtain, described Worm gear feed screw Lift Part comprises worm gear, screw mandrel, and 4 worm gears are fixed on framework soleplate, and 4 rhizoid bars are moved up and down by worm-gear driven, and 4 rhizoid masthead ends are fixing holder web plate jointly, described Worm gear feed screw Lift Part and feed to curtain by the control of automation variable-speed motor.
In process of production, Motor Drive horizontal rotating shaft drives bidirectional cam, the first two-way guide pillar, the second two-way guide pillar to pump, and carries out acupuncture; By the feeding to curtain feeding frequency and speed and control Worm gear feed screw Lift Part and regulate the holder web plate of two-way feeding needing machine to decline of automation variable-speed motor control both sides, the thicker holder web plate of goods is lower.When one side is fed to curtain feed, synchronously carry out acupuncture, the complete prefabrication that is fixed level of acupuncture, adjusts holder web plate and declines, and feeds the superimposed some fixing levels of acupuncture infiltration that carry out of virgin material to curtain input, until obtain certain thickness quasi three-dimensional prefab with opposite side.In acupuncture course, due to the effect of stripping web plate upper cylinder, effectively control density and the interlayer density of quasi three-dimensional prefab.
Compared to the prior art, beneficial effect of the present invention:
1, adopt polyacrylonitrile-based carbon fibre to replace pre-oxidized polyacrylonitrile fiber, reduce carbonization technique link, avoided in carbonisation because long and short fiber shrinks the distortion causing, the coking that density unevenness causes.Utilize net tire prepared by the PANCF filling aspect as prefabricated component, in follow-up acupuncture forming process, easily produce Z-direction fiber and improve prefabricated component Z direction strength, optimized prefabricated component internal structure and distribution of pores.
2, aircraft carbon brake is the strong friction material of a kind of circular superelevation, in view of its direction of motion, long carbon fiber laid fabric is reasonably laid different angles at X, Y in-plane, offers plane tension, the rupture strength of the prefabricated component optimum of manufacturing aeroplane brake discs.
3, adopt chopped carbon fiber net tire and long fiber laid fabric to lay lamination, the some fixing levels of continuous needle infiltration, and the accurate three dimension stereo fabric joining with the some fixing level adjoining, acupuncture has increased the longitudinally continuous penetrability fiber of a certain amount of Z-direction to vertical direction, make it easily to adsorb bearing substrate carbon in CVD process, thereby greatly improve the anti-wear polishing machine of airplane carbon brake disc, heat conductivility, tensile strength and the shear strength of vertical direction.
4, laid fabric only only has one direction tension force, and overlap without fiber, reduce guiding puncture continuous fibers resistance, and acupuncture is also few to fibre damage, by increasing acupuncture thickness, can be by the staple fiber net tire of lamination and long carbon fiber flat fabric, carry out continuous needle and permeate gradually some fixing levels, improve the longitudinal reinforced fiber content of Z-direction of prefabricated component, effectively controlled interlayer consistent in density.
Brief description of the drawings
Fig. 1 is the three-dimensional structure schematic diagram of quasi three-dimensional prefab of the present invention.
In Fig. 1,31-laid fabric, 32-net tire.
Fig. 2 is the structural representation of two-way feeding needing machine.
Fig. 3 is the side view of two-way feeding needing machine.
Detailed description of the invention
The present invention will be further described in conjunction with the accompanying drawings and embodiments.
As shown in Figures 2 and 3, a kind of two-way feeding needing machine, comprise frame 1, be located at the motor 2 at frame 1 top, needle beam 9, needle plate 10, stripping web plate 12, corresponding to the holder web plate 13 of below of stripping web plate 12, for controlling the Worm gear feed screw Lift Part of holder web plate 13 liftings, horizontal rotating shaft 4 is arranged on frame 1 top by bearing 3, horizontal rotating shaft 4 is driven by motor 2 by belt 11, in horizontal rotating shaft 4 left and right sides, two bidirectional cams 5 are installed, corresponding to described bidirectional cam 5 belows, the first two-way guide pillar 6 is installed, the first two-way guide pillar 6 contacts with corresponding bidirectional cam 5, needle beam 9 is fixed on the first two-way guide pillar 6 times, be positioned at two bidirectional cam 5 outsides at horizontal rotating shaft 4 and be also provided with two the second two-way guide pillars 7, the second two-way guide pillar 7 lower ends are provided with oil cylinder 8, described oil cylinder 8 and stripping web plate 12 are fixing, be provided with in the both sides of correspondence holder web plate 13 horizontal planes and feed to curtain 16, described Worm gear feed screw Lift Part comprises that worm gear 15,14,4 worm gears 15 of screw mandrel are fixed on framework soleplate, and 4 rhizoid bars 14 are driven and moved up and down by worm gear 15, and 4 rhizoid bar 14 tops are fixing holder web plate 13 jointly, described Worm gear feed screw Lift Part and feed to curtain 16 by the control of automation variable-speed motor.
In process of production, motor 2 drives horizontal rotating shaft 4 to drive bidirectional cam 5, the first two-way guide pillar 6, the second two-way guide pillar 7 to pump, and carries out acupuncture; By the feeding to curtain 16 feeding frequencies and speed and control Worm gear feed screw Lift Part and regulate the holder web plate 13 of two-way feeding needing machine to decline of automation variable-speed motor control both sides, the thicker holder web plate of goods is lower.When feeding to curtain 16 feed, one side synchronously carries out acupuncture, the complete prefabrication that is fixed level of acupuncture, adjust holder web plate 13 and decline, feed the virgin material of inputting the superimposed some fixing levels of acupuncture infiltration that carry out to curtain 16 with opposite side, until obtain certain thickness quasi three-dimensional prefab.In acupuncture course, because stripping web plate 12 upper cylinders 8 act on, effectively control density and the interlayer density of quasi three-dimensional prefab.
Polyacrylonitrile-radical long carbon fiber is cut into the polyacrylonitrile-radical chopped carbon fiber that length is 60mm, spraying moisture makes chopped carbon fiber keep 40% humidity, maintain the temperature at 25 DEG C 5 hours, make its softening modification, take out after staple fiber along single roller opener roll axial direction, " S " type of formation cloth pin mode, shredding is the wadding fibrous suede of 90% shatter value, then unclogs and readjusts into thickness 0.3mm, surface density 200g/m by carding machine
2thin type net felt fabric (net tire).Radially superimposed polyacrylonitrile-radical long carbon fiber acupuncture is become to thickness 0.3mm, surface density 250g/m
2thin layer laid fabric.As shown in Figure 1, by laid fabric and net tire alternative stacked, adjacent laid fabric interlayer is spent the staggered laying of angle with 0 degree/90, and makes the two-layer laid fabric that is of outermost, according to needling density 40 pins/cm
2in vertical direction (Z direction) the continuous needle infiltration of laid fabric and net tire alternative stacked, make to hold in the palm the web plate 5mm that once declines by automation variable-speed motor control Worm gear feed screw Lift Part, until acupuncture becomes the quasi three-dimensional prefab of thickness 400mm, the 20 layers/cm of quasi three-dimensional prefab interlayer density, the bulk density 0.45g/cm that make
3, vertical direction fiber content 38%.
Polyacrylonitrile-radical long carbon fiber is cut into the polyacrylonitrile-radical chopped carbon fiber that length is 70mm, squirt surface with octadecyl dimethyl ethoxy quaternary ammonium nitrate, being placed in closed container deposits 20 hours, make its softening modification, take out dewatered drying at normal temperatures, after staple fiber, along single roller opener roll axial direction, form " S " type cloth pin mode, shredding is the wadding fibrous suede of 90% shatter value, then unclogs and readjusts into thickness 0.15mm, surface density 80g/m by carding machine
2thin type net felt fabric (net tire).Directed polyacrylonitrile-radical long carbon fiber superimposed acupuncture is become to thickness 0.15mm, surface density 100g/m
2thin layer laid fabric.As shown in Figure 1, by laid fabric and net tire alternative stacked, adjacent laid fabric interlayer is spent the staggered laying of angle with 0 degree/90, and makes the two-layer laid fabric that is of outermost, according to needling density 45 pins/cm
2in vertical direction (Z direction) the continuous needle infiltration of laid fabric and net tire alternative stacked, make to hold in the palm the web plate 4mm that once declines by automation variable-speed motor control Worm gear feed screw Lift Part, until acupuncture becomes the quasi three-dimensional prefab of thickness 300mm, the 19 layers/cm of quasi three-dimensional prefab interlayer density, the bulk density 0.70g/cm that make
3, vertical direction fiber content 45%.
Embodiment 3
Polyacrylonitrile-radical long carbon fiber is cut into the polyacrylonitrile-radical chopped carbon fiber that length is 80mm, spraying moisture makes chopped carbon fiber keep 70% humidity, maintain the temperature at 25 DEG C 3 hours, make its softening modification, after taking out after staple fiber along single roller opener roll axial direction, " S " type of formation cloth pin mode, shredding is the wadding fibrous suede of 90% shatter value, then unclogs and readjusts into thickness 0.2mm, surface density 125g/m by carding machine
2thin type net felt fabric (net tire).Directed polyacrylonitrile-radical long carbon fiber superimposed acupuncture is become to thickness 0.25mm, surface density 200g/m
2thin layer laid fabric.As shown in Figure 1, by laid fabric and net tire alternative stacked, adjacent laid fabric interlayer is spent the staggered laying of angle with 0 degree/90, and makes the two-layer laid fabric that is of outermost, according to needling density 50 pins/cm
2in vertical direction (Z direction) the continuous needle infiltration of laid fabric and net tire alternative stacked, make to hold in the palm the web plate 5mm that once declines by automation variable-speed motor control Worm gear feed screw Lift Part, until acupuncture becomes the quasi three-dimensional prefab of thickness 350mm, the 16 layers/cm of quasi three-dimensional prefab interlayer density, the bulk density 0.65g/cm that make
3, vertical direction fiber content 55%.
Polyacrylonitrile-radical long carbon fiber is cut into the polyacrylonitrile-radical chopped carbon fiber that length is 85mm, spraying moisture makes chopped carbon fiber keep 60% humidity, maintain the temperature at 25 DEG C 2 hours, make its softening modification, after taking out after staple fiber along single roller opener roll axial direction, " S " type of formation cloth pin mode, shredding is the wadding fibrous suede of 90% shatter value, then unclogs and readjusts into thickness 0.25mm, surface density 150g/m by carding machine
2thin type net felt fabric (net tire).Directed polyacrylonitrile-radical long carbon fiber superimposed acupuncture is become to thickness 0.25mm, surface density 200g/m
2thin layer laid fabric.As shown in Figure 1, laid fabric is laid and net tire alternative stacked in X, Y-direction different angles, adjacent laid fabric is 60 degree in the laying angle of X, Y-direction, and makes the two-layer laid fabric that is of outermost, according to needling density 50 pins/cm
2, acupuncture thickness 350mm is in vertical direction (Z direction) the continuous needle infiltration of laid fabric and net tire alternative stacked, make to hold in the palm the web plate 4mm that once declines by automation variable-speed motor control Worm gear feed screw Lift Part, until acupuncture becomes the quasi three-dimensional prefab of thickness 80mm, the 12 layers/cm of quasi three-dimensional prefab interlayer density, the bulk density 0.60g/cm that make
3, vertical direction fiber content 52%.
Claims (9)
1. a quasi three-dimensional prefab, it is characterized in that: it comprises laid fabric and net tire alternative stacked, the some fixing levels of vertical direction continuous needle infiltration through two-way feeding needing machine in laid fabric and net tire alternative stacked, produce vertical direction fiber at interlayer and connect adjacent some layers, make the integrally-built quasi three-dimensional prefab of a kind of carbon fiber, the bulk density of described quasi three-dimensional prefab is 0.45～0.70g/cm
3.
2. quasi three-dimensional prefab according to claim 1, is characterized in that: described laid fabric is thickness 0.15～0.3mm, the surface density 20～300g/m being made up of the radially superimposed acupuncture of polyacrylonitrile-radical long carbon fiber
2thin layer bondedfibre fabric.
3. quasi three-dimensional prefab according to claim 1, is characterized in that: described net tire be by polyacrylonitrile-radical chopped carbon fiber through steam or chemical handling flexibly, mechanical shredding, be carded to thickness 0.15～0.3mm, surface density 20～300g/m
2thin type net felt fabric; The length of described polyacrylonitrile-radical chopped carbon fiber is 60～90mm.
4. quasi three-dimensional prefab according to claim 1, is characterized in that: described adjacent laid fabric interlayer is with the staggered laying of 0 degree/90 degree angle.
5. quasi three-dimensional prefab according to claim 1, is characterized in that: needling density 30～50 pins/cm
2.
6. quasi three-dimensional prefab according to claim 1, is characterized in that: 10～25 layers/cm of interlayer density of described quasi three-dimensional prefab.
7. quasi three-dimensional prefab according to claim 1, is characterized in that: the thickness of described quasi three-dimensional prefab is 10～400mm.
8. quasi three-dimensional prefab according to claim 1, is characterized in that: the vertical direction fiber content 25%～55% of described quasi three-dimensional prefab.
9. a preparation method for quasi three-dimensional prefab, is characterized in that: the method comprises the following steps:
(1) the thickness 0.15～0.3mm, the surface density 20～300g/m that, are made by the radially superimposed acupuncture of polyacrylonitrile-radical long carbon fiber
2laid fabric; By polyacrylonitrile-radical chopped carbon fiber through steam or chemical handling flexibly, mechanical shredding, be carded to thickness 0.15～0.3mm, surface density 20～300g/m
2net tire;
(2), laid fabric and net tire alternative stacked, control adjacent laid fabric interlayer with the staggered laying of 0 degree/90 degree angle;
(3) the some fixing levels of vertical direction continuous needle infiltration, through two-way feeding needing machine in laid fabric and net tire alternative stacked, needling density 30～50 pins/cm
2, produce vertical direction fiber at interlayer and connect adjacent some layers, making bulk density is 0.45～0.70g/cm
3, 10～25 layers/cm of interlayer density the integrally-built quasi three-dimensional prefab of carbon fiber.
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| CN110747578A (en) * | 2019-10-25 | 2020-02-04 | 江苏天鸟高新技术股份有限公司 | High-density carbon fiber needled felt and preparation method thereof |
| CN110952223A (en) * | 2019-12-23 | 2020-04-03 | 宜兴市华恒高性能纤维织造有限公司 | Novel acupuncture three-dimensional structure |
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| CN111746061A (en) * | 2019-03-29 | 2020-10-09 | 中国科学院宁波材料技术与工程研究所 | Three-dimensional fabric laminated needling composite material and preparation method thereof |
| CN114013127A (en) * | 2022-01-06 | 2022-02-08 | 天津工业大学 | Non-woven fabric reinforced composite material and preparation method thereof |
| WO2024055392A1 (en) * | 2022-09-15 | 2024-03-21 | 南京航空航天大学 | Weaving and needling integrated preform formation method and preform formation device |
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| CN109267243A (en) * | 2018-12-11 | 2019-01-25 | 上海善巧碳素设备科技有限公司 | Brake block needing machine and brake block production method |
| CN109267243B (en) * | 2018-12-11 | 2023-08-15 | 常州善巧复合材料科技有限公司 | Brake pad needling machine and brake pad production method |
| CN111746061A (en) * | 2019-03-29 | 2020-10-09 | 中国科学院宁波材料技术与工程研究所 | Three-dimensional fabric laminated needling composite material and preparation method thereof |
| CN110747578A (en) * | 2019-10-25 | 2020-02-04 | 江苏天鸟高新技术股份有限公司 | High-density carbon fiber needled felt and preparation method thereof |
| CN110978660A (en) * | 2019-12-16 | 2020-04-10 | 航天特种材料及工艺技术研究所 | Design method of gradient fiber preform |
| CN110952223A (en) * | 2019-12-23 | 2020-04-03 | 宜兴市华恒高性能纤维织造有限公司 | Novel acupuncture three-dimensional structure |
| CN114013127A (en) * | 2022-01-06 | 2022-02-08 | 天津工业大学 | Non-woven fabric reinforced composite material and preparation method thereof |
| CN114013127B (en) * | 2022-01-06 | 2022-04-29 | 天津工业大学 | Non-woven fabric reinforced composite material and preparation method thereof |
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