CN214422531U - Variable-aperture-diameter carbon/carbon composite brake disc preform - Google Patents
Variable-aperture-diameter carbon/carbon composite brake disc preform Download PDFInfo
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- CN214422531U CN214422531U CN202023044326.4U CN202023044326U CN214422531U CN 214422531 U CN214422531 U CN 214422531U CN 202023044326 U CN202023044326 U CN 202023044326U CN 214422531 U CN214422531 U CN 214422531U
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Abstract
The utility model belongs to the technical field of the preform technique and specifically relates to a become charcoal/charcoal combined material brake disc preform of hole aperture, the preform is woven through weftless cloth and carbon fiber net child through the acupuncture quadrature and is formed and form the hole, the average aperture of preform along thickness direction central aperture is less than the average aperture in surface aperture, the beneficial effects of the utility model are that, through the aperture of center to surface aperture on the control preform thickness direction for each part of preform thickness direction has different specific surface area, makes the average aperture in central aperture less, and makes the average aperture in surface aperture great, can prevent that pyrolytic carbon from easily crusting at preform surface deposition, solves the technical problem that pyrolytic carbon can not be deposited at preform central part and density is low, guarantees that the preform is by the density homogeneous of surface to center.
Description
Technical Field
The utility model belongs to the technical field of the preform technique and specifically relates to a become charcoal/charcoal combined material brake disc preform of aperture footpath.
Background
The carbon/carbon composite material is an advanced composite material, and carbon fiber products, such as weftless cloth, carbon felt, plain cloth and the like, are made into prefabricated bodies through processes of weaving, needling and the like to be used as a composite material reinforcement. The carbon fiber is a novel high-strength high-modulus fiber material with the carbon content of more than 95%, and has a plurality of excellent properties, such as low density, high specific strength and specific modulus, no creep, high temperature resistance in a non-oxidation environment, good fatigue resistance, specific heat and conductivity between nonmetal and metal, small thermal expansion coefficient, anisotropy, good corrosion resistance, good X-ray permeability and the like. The matrix material of the carbon/carbon composite material is also carbon, so that the carbon/carbon composite material not only has excellent performances of a graphite material, such as good electrical conductivity and thermal conductivity, excellent friction performance, high melting point, chemical stability and the like, but also has high strength. Therefore, the member made of the carbon/carbon composite material can replace the graphite material, and is greatly superior to the graphite material in the aspects of service performance, service life and the like.
The forming mode and the density of the carbon matrix are main factors determining the performance of the carbon/carbon composite material, and the CVD process is a main technology for preparing the high-performance carbon/carbon composite material and is also a mainstream technical means for preparing the carbon brake disc at home and abroad at present. The process comprises the steps of firstly carrying out high-temperature thermal treatment on a woven carbon brake disc preform with a porous structure, then loading the carbon brake disc preform into a chemical vapor deposition furnace, introducing a carbon source gas (usually propylene, propane, methane and the like) under certain temperature and pressure for cracking, and continuously depositing generated pyrolytic carbon into pores in the preform to gradually densify the carbon brake disc preform.
The CVD process has the characteristics of simple process, excellent and stable product performance, no limitation of geometric shapes of products, suitability for large-scale industrial production and the like, but the process also has obvious defects, such as easy deposition of pyrolytic carbon on the surface of a preform to form a crust, low density of the central part of the preform and the like.
SUMMERY OF THE UTILITY MODEL
In order to overcome the defects of crusting formed by the surface deposition of the prior preform and low density of the central part of the preform, the utility model provides a carbon/carbon composite material brake disc preform with variable pore diameter.
The utility model provides a technical scheme that its technical problem adopted is: the carbon/carbon composite brake disc preform with the variable pore diameter is formed by orthogonally knitting non-woven cloth and a carbon fiber net tire through needling and forms pores, and the average pore diameter of the central pores of the preform in the thickness direction is smaller than that of the surface pores.
According to another embodiment of the present invention, further comprising, the preform center to surface porosity mean pore size gradually increases.
According to another embodiment of the present invention, further comprising, the mean pore diameter of the preform center to surface pores is increased stepwise.
According to the utility model discloses a further embodiment, further include, no latitude cloth and carbon fiber net child stromatolite form the unit layer, and each unit layer top-down is through successive acupuncture connection of successive layer crossing.
According to the utility model discloses a further embodiment, further include, the length of carbon fiber net child is 40~ 45 mm.
According to the utility model discloses a further embodiment, further include, the unit layer is 12 ~ 16 layers/cm.
The beneficial effects of the utility model are that, through the aperture of central to surface pore on the control preform thickness direction for each part of preform thickness direction has different specific surface area, makes the average pore diameter in central pore less, and makes the average pore diameter in surface pore great, can prevent that pyrolytic carbon from easily depositing the crust on the preform surface, solves the technical problem that the central part of preform can not deposit pyrolytic carbon and density is low, guarantees that the preform is by the density homogeneous at surface to center.
Drawings
The present invention will be further explained with reference to the drawings and examples.
Fig. 1 is a schematic view of a first embodiment of the present invention;
fig. 2 is a schematic view of a second embodiment of the present invention;
FIG. 3 is a schematic diagram of a cell layer;
FIG. 4 is a schematic illustration of preform dimensions.
In the figure, 1, no-weft cloth, 2, carbon fiber net tire, 3, pore, 4 and unit layers.
Detailed Description
Fig. 1 to 4 are schematic structural views of the present invention, which is a carbon/carbon composite brake disc preform with variable pore diameter, and is characterized in that the preform is formed by knitting non-woven cloth 1 and carbon fiber mesh tire 2 through needling orthogonal weaving and forms pores 3, and the average pore diameter of the central pores 3 along the thickness direction of the preform is smaller than that of the surface pores 3.
Specifically, the pore diameter from the center to the surface pores 3 in the thickness direction of the preform is controlled, so that each part in the thickness direction of the preform has different specific surface areas, the average pore diameter of the central pores 3 is smaller, the average pore diameter of the surface pores 3 is larger, the pyrolytic carbon can be prevented from being easily deposited on the surface of the preform to form crusts, the technical problem that the density of the pyrolytic carbon cannot be deposited at the center of the preform and is low is solved, and the uniform density of the preform from the surface to the center is ensured.
It is worth mentioning that the needling orthogonal knitting process is a method for manufacturing a prefabricated body with wider application, after laying the non-woven cloth and the carbon fiber net tire, adopting the felting needle with the special function of the barb on the edge for needling, carrying the carbon fiber net tire to the Z direction by the barb, introducing the vertical fiber cluster, enabling the non-woven cloth and the carbon fiber net tire to be intertwined and mutually constrained, and forming a prefabricated body structure with certain strength on the plane and between layers.
According to another embodiment of the present invention, further comprising a gradual increase of the average pore size of the preform center to surface pores 3.
According to another embodiment of the present invention, further comprising a stepwise increase of the average pore diameter of the preform center to surface pores 3.
According to the utility model discloses a further embodiment, further include, no latitude cloth 1 and carbon fiber net child 2 stromatolite form unit layer 4, and each unit layer 4 top-down is connected through successive layer alternately continuous acupuncture.
According to another embodiment of the present invention, further comprising, the length of the carbon fiber mesh tire 2 is 40-45 mm. The length of the carbon fiber net tire 2 can be 40-50 mm, and preferably 40-45 mm.
According to another embodiment of the present invention, further comprising that the unit layer 4 is 12 to 16 layers/cm.
In order to deepen the utility model discloses a understanding, preparation brake disc driving disk preform, wherein, the disc external diameter is 436mm, internal diameter 232mm, and thickness is 30 mm.
EXAMPLE one (pore diameter gradual change type)
Using 0
/90
Laminating a non-woven fabric and a carbon fiber net tire according to the formula of 0
Weftless fabric/net tyre/90
Weftless fabric/net tire/0
The brake disc prefabricated member is orthogonally woven by needling in the order of weftless fabric/net tire/…', the structure of each unit layer 4 is shown in figure 3, wherein the length of net tire carbon fiber is 40-50 mm, and the surface density is 60-120 g/m2. The method specifically comprises the following steps:
(1) cutting carbon fibers into lengths of 40-50 mm, and laying the carbon fibers into layers with the surface densities of 60-80, 80-100 and 100-120 g/m2The net tire of (1).
(2) At 0
Laying a layer of 100-120 g/m of weftless fabric2The net tyre layer is paved with a layer 90
No weft cloth, again 90
Continuously laying 100-120 g/m of weftless fabric2A total of about 6 layers of the web. While laying, carrying out layer-by-layer cross continuous needling from top to bottom, wherein the needling density gradually changes from 50 needles/cm2Increased to 60 needles/cm2。
(3) Continuously laying the non-woven cloth/net tire on the basis of the prefabricated body prepared in the step (2), wherein the density of the net tire used in the layer is 80-100 g/m2A total of about 7 layers were laid. Laying, performing layer-by-layer cross continuous needling from top to bottom, wherein the needling density gradually changes from 50 needles/cm2Increased to 60 needles/cm2.。
(4) Continuously laying the non-woven cloth/net tire on the basis of the prefabricated body prepared in the step (3), wherein the density of the net tire used in the layer is 60-80 g/m2A total of about 16 layers were laid. Laying, performing layer-by-layer cross continuous needling from top to bottom, wherein the needling density gradually changes from 50 needles/cm2Increased to 60 needles/cm2After 8 unit layers are laid, the needling density is controlled by 60 needles/cm2Gradually decreases to 50 needles/cm2。
(5) And (5) sequentially repeating the step (3) and the step (2) on the basis of the preform prepared in the step (4) to obtain a final preform.
EXAMPLE two (pore size step-like variation)
Using 0
/90
Laminating a non-woven fabric and a carbon fiber net tire according to the formula of 0
Weftless fabric/net tyre/90
Weftless fabric/net tire/0
The order of the weftless fabric/net tire/…' is that the prefabricated body is orthogonally woven by needling, the structure of each unit layer 4 is shown as figure 3, wherein the length of the net tire carbon fiber is 40-50 mm, and the surface density is 60-120 g/m2. The method specifically comprises the following steps:
(1) cutting carbon fibers into lengths of 40-50 mm, and laying the carbon fibers into layers with the surface densities of 60-80, 80-100 and 100-120 g/m2The net tire of (1).
(2) At 0
Laying a layer of 60-80 g/m of weftless fabric2The net tyre layer is paved with a layer 90
No weft cloth, again 90
60-80 g/m of laid non-woven cloth2The net tire is paved into about 16 layers in total, and is subjected to layer-by-layer cross continuous needling from top to bottom, wherein the needling density is 60 needles/cm2。
(3) On the basis of the prefabricated body prepared in the step (2), the upper part and the lower part are symmetrical according to the value of 0
Weftless fabric/net tyre/90
Laying the laid fabric/net tire, wherein the surface density of the net tire is 80-100 g/m2The total of 7 layers are paved, and the layer-by-layer crossed continuous needling is carried out from top to bottom, wherein the needling density is 55 needles/cm2。
(4) On the basis of the prefabricated body prepared in the step (3), the upper part and the lower part are symmetrical according to the formula of' 0
Weftless fabric/net tyre/90
Laid by non-woven fabric/net tire, wherein the surface density of the net tire is 100-120 g/m2The total number of the needle is about 6 layers, and the needle punching is carried out layer by layer in a crossed and continuous way from top to bottom, and the needle punching density is 50 needles/cm2。
Examples one and examples the size of the pores 3 of the preform was controlled by controlling the composition ratio of the non-woven fabric 1 and the carbon fiber net 2 in the unit layer 4 and the size of the needling density. The average pore diameter of the pores 3 in the first embodiment is gradually changed, and the average pore diameter of the pores 3 in the second embodiment is changed in a step manner.
The foregoing description is intended to be illustrative rather than limiting, and it will be appreciated by those skilled in the art that many modifications, variations or equivalents may be made without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (6)
1. The carbon/carbon composite material brake disc preform with the variable pore diameter is characterized in that the preform is formed by orthogonally knitting non-woven cloth (1) and a carbon fiber net tire (2) through needling and forms pores (3), and the average pore diameter of the central pores (3) of the preform in the thickness direction is smaller than that of surface pores (3).
2. A variable-porosity carbon/carbon composite brake disc preform according to claim 1, wherein the mean pore size of the pores (3) from the center to the surface of the preform increases in a gradual manner.
3. A variable-porosity carbon/carbon composite brake disc preform according to claim 1, wherein the average pore size of the pores (3) from the center to the surface of the preform increases stepwise.
4. The carbon/carbon composite material brake disc preform with the variable aperture diameter as claimed in claim 1, wherein the laid fabric (1) and the carbon fiber mesh tire (2) are laminated to form unit layers (4), and the unit layers (4) are connected from top to bottom through layer-by-layer cross continuous needling.
5. The variable-pore-diameter carbon/carbon composite brake disc preform as claimed in claim 1 or 4, wherein the length of the carbon fiber mesh tire (2) is 40-45 mm.
6. The variable-pore-diameter carbon/carbon composite brake disc preform as claimed in claim 4, wherein the unit layers (4) are 12-16 layers/cm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023044326.4U CN214422531U (en) | 2020-12-17 | 2020-12-17 | Variable-aperture-diameter carbon/carbon composite brake disc preform |
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|---|---|---|---|
| CN202023044326.4U CN214422531U (en) | 2020-12-17 | 2020-12-17 | Variable-aperture-diameter carbon/carbon composite brake disc preform |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114407227A (en) * | 2022-01-12 | 2022-04-29 | 江南大学 | High-layer dense flat carbon fiber gradient suture preform and preparation method thereof |
| CN115231938A (en) * | 2022-07-22 | 2022-10-25 | 常州翊翔炭材科技有限公司 | Preparation method of carbon/carbon composite material brake disc |
-
2020
- 2020-12-17 CN CN202023044326.4U patent/CN214422531U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114407227A (en) * | 2022-01-12 | 2022-04-29 | 江南大学 | High-layer dense flat carbon fiber gradient suture preform and preparation method thereof |
| CN115231938A (en) * | 2022-07-22 | 2022-10-25 | 常州翊翔炭材科技有限公司 | Preparation method of carbon/carbon composite material brake disc |
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