CN111361182B - Online repairing process for thermoplastic composite material - Google Patents
Online repairing process for thermoplastic composite material Download PDFInfo
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- CN111361182B CN111361182B CN202010240093.0A CN202010240093A CN111361182B CN 111361182 B CN111361182 B CN 111361182B CN 202010240093 A CN202010240093 A CN 202010240093A CN 111361182 B CN111361182 B CN 111361182B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C73/00—Repairing of articles made from plastics or substances in a plastic state, e.g. of articles shaped or produced by using techniques covered by this subclass or subclass B29D
- B29C73/24—Apparatus or accessories not otherwise provided for
- B29C73/26—Apparatus or accessories not otherwise provided for for mechanical pretreatment
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C73/00—Repairing of articles made from plastics or substances in a plastic state, e.g. of articles shaped or produced by using techniques covered by this subclass or subclass B29D
Abstract
The invention discloses an online repair process of a thermoplastic composite material, which comprises the following steps: (1) carrying out surface treatment on the area to be repaired, and laying a reinforcing fabric in the area to be repaired after the treatment; (2) heating and pressurizing resin powder, spraying the resin powder to the surface of the reinforcing fabric under the action of high-pressure gas, impacting the surface of the reinforcing fabric by resin powder particles, dispersing fiber bundles into fibers of the reinforcing fabric, and simultaneously impacting part of the resin powder to an area to be repaired through the reinforcing fabric and entering the area to be repaired; (3) and stopping spraying, cooling and solidifying to enable part of fibers and resin powder in the reinforcing fabric to be meshed with the resin matrix of the area to be repaired, and finishing on-line repair after solidification. The invention not only realizes the on-line repair of the thermoplastic composite material, but also improves the overall mechanical property of the area to be repaired, and effectively prolongs the service life of the thermoplastic composite material.
Description
Technical Field
The invention relates to the technical field of composite materials, in particular to an online repair process of a thermoplastic composite material.
Background
The continuous fiber reinforced thermoplastic composite material is a composite material having high strength, high rigidity and high toughness, which is produced by a process of melting and impregnating a thermoplastic resin with a connecting fiber as a reinforcing material and a thermoplastic resin as a matrix. The continuous fiber reinforced thermoplastic composite material has been widely used in various fields such as automobile industry, aerospace, military industry, electronics and the like due to the characteristics of light weight, high rigidity, high toughness and the like.
At present, the repair of composite materials is generally carried out in the following two ways:
one is to dig, polish and glue (or paste) deeply at the damaged part of the composite material, but the process is mostly used for thermosetting composite material systems, is not suitable for high-performance thermoplastic composite material systems, can not be repaired on line and has the defect of long repair period,
the other method is to adopt a contact heating mode for repairing (welding and the like), but the online repairing temperature field of the process is difficult to guarantee, and the process is only suitable for a general plastic system and is not suitable for thermoplastic composite materials.
In addition, the following techniques are also known for repairing composite materials:
for example, the document of chinese patent No. CN105968808B discloses a self-repairing resin-based composite material and a preparation method thereof, the repairing materials involved are bismaleimide resin, epoxy resin, a curing agent and mesoporous silica, and the repairing process mainly includes the following steps: firstly, processing a certain proportion of epoxy resin and mesoporous silica for 0.5-1h at the temperature of 100 ℃ and the vacuum degree of 0.01-0.06 MPa; secondly, adding the bismaleimide resin and the curing agent in a certain sequence to mix at the temperature of 130-140 ℃, carrying out prepolymerization reaction for 0.5-1h at the temperature of 140-150 ℃, and then carrying out defoaming treatment; thirdly, curing treatment, wherein the process is 160 ℃/2h +180 ℃/2h +200 ℃/2 h. However, the repair technology still has the following defects in the application process: firstly, various raw materials are involved in the repair, and the operation is complicated; secondly, the conditions required by repair are harsh, the repair is required to be carried out under the environment conditions of high temperature and high pressure, and the online repair cannot be met; the whole repairing process is close to 10 hours, and the repairing efficiency is extremely low; bismaleimide resin is a typical high performance thermosetting resin, i.e. the process is only applicable to thermosetting resins.
For example, chinese patent No. CN104626543B discloses a welding method for thermoplastic composite material, which mainly includes the following steps: firstly, processing a surface to be welded; combining and fixing two surfaces to be welded; thirdly, the assembly to be welded contains metal materials, and laser welding is carried out according to a set route under the action of laser. But the process still has the defects of difficult guarantee of online repair of the temperature field and poor welding effect.
Therefore, the rapid, efficient and feasible online repair technology is not available for a high-performance thermoplastic composite material (melting point is more than 250 ℃) system.
Disclosure of Invention
The invention aims to overcome the problems in the prior art and provides an online repair process for thermoplastic composite materials, and the technical problem to be solved by the invention is to realize rapid and efficient online repair for thermoplastic composite materials.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
an on-line repair process for a thermoplastic composite material, comprising the steps of:
(1) carrying out surface treatment on the area to be repaired, and laying a reinforcing fabric in the area to be repaired after the treatment;
(2) heating and pressurizing resin powder, spraying the resin powder to the surface of the reinforcing fabric under the action of high-pressure gas, impacting the surface of the reinforcing fabric by resin powder particles, dispersing fiber bundles into fibers of the reinforcing fabric, and simultaneously impacting part of the resin powder to an area to be repaired through the reinforcing fabric and entering the area to be repaired; on one hand, partial kinetic energy of the resin powder is converted into heat energy, and the reinforcing fabric is plasticized and impregnated; on the other hand, the resin powder sprayed to the area to be repaired converts the kinetic energy of the resin powder into heat energy, so that the resin matrix of the area to be repaired is melted and generates relative displacement with the sprayed resin in space, and molecular chain segment entanglement is formed;
(3) and stopping spraying, cooling and solidifying to enable part of fibers and resin powder in the reinforcing fabric to be meshed with the resin matrix of the area to be repaired, and finishing on-line repair after solidification.
The surface treatment of the region to be repaired in step (1) includes, but is not limited to, deep digging, grinding and cutting.
The reinforcing fabric in the step (1) is a mixed woven fabric of one or more of glass fiber fabric, carbon fiber fabric and aramid fiber fabric.
In the step (2), the particle size of the resin powder is less than or equal to 100 mu m, the heating temperature is 10-100 ℃ lower than the melting point of the resin powder, and the pressurizing pressure is 0.5-5 Mpa.
The spraying distance of the resin powder in the step (2) is 5-70 mm.
And (3) feeding the resin powder by a powder feeding system connected to a resin powder raw material device in the step (2), heating and pressurizing the resin powder by an energy transmission system, enabling the resin powder to obtain kinetic energy by a high-pressure gas system, and spraying the resin powder to the surface of the reinforcing fabric by a spraying system.
The invention has the advantages that:
1. in the on-line repairing process, the step (1) has the advantages that the area to be repaired and the periphery of the area to be repaired can be connected into a whole through the reinforcing fabric, the overall mechanical property of the area to be repaired after being repaired is improved, and the service life of the area to be repaired is prolonged. One of the advantages of the step (2) is that the high-speed jet flow can be obtained from the solid resin powder through the high-pressure gas, and the kinetic energy of the resin powder is converted into heat energy, so that the high-melting-point resin particles are well instantly plasticized, the difficult problem of difficult field preplasticizing is avoided, and the method is suitable for repairing the high-melting-point thermoplastic composite material; the second advantage is that after the resin powder moving at high speed is sprayed to the reinforcing fabric, the fiber bundles can be well dispersed to the inside of the fibers of the reinforcing fabric, and meanwhile, the resin is plasticized and shaped, so that the fibers are well impregnated by the resin; the third advantage is that when the resin powder moving at high speed is sprayed to the surface of the area to be repaired to convert kinetic energy into heat energy, the surface matrix resin of the area to be repaired can be partially melted to form relative displacement with the jet flow resin in space under the high-speed movement, so that a good transition layer is formed, and the interface bonding effect is good; the fourth advantage is that when the resin powder moving at high speed is sprayed to the surface of the area to be repaired, the surface of the area to be repaired forms a rugged concave-convex structure, which is beneficial to the resin powder to penetrate into the pits and the grooves. The step (3) has the advantage that the resin matrix can be meshed with and fixed with the area to be repaired, so that the strength of the repaired interface is greatly improved. The specific process can realize low-temperature high-speed injection molding, has high energy conversion efficiency, lower overall energy consumption and high efficiency, realizes the online repair of the thermoplastic composite material, improves the overall mechanical property of a to-be-repaired area, and effectively prolongs the service life of the thermoplastic composite material.
2. The invention heats and pressurizes the resin powder, the heating temperature is 10-100 ℃ lower than the melting point of the resin powder, and the pressurizing pressure is 0.5-5 Mpa. The specific heating and pressurizing parameters can enable the resin powder to obtain certain energy, and facilitate energy conversion in the subsequent repairing process. Enabling static resin powder to obtain kinetic energy through high-pressure gas, and then spraying the kinetic energy to the surface of the reinforcing fabric at a certain speed to realize self-plasticization of resin particles; meanwhile, the high-speed particles have a good dispersing effect on the fibers, and the dispersion of the fibers and the impregnation of the fibers by the resin are realized.
3. The invention sets the spraying distance of the resin powder to be 5-70mm, thereby not only ensuring that the heated resin powder can impact the reinforced fabric with better kinetic energy, but also ensuring the best repairing effect.
4. The technology of the invention has simple and quick operation and good repairing effect, and is particularly suitable for on-line repairing.
Drawings
FIG. 1 is a schematic structural view of the present invention;
labeled as: 1. powder feeding system, 2, high-pressure gas system, 3, energy conveying system, 4, spraying system, 5, resin powder, 6, reinforcing fabric, 7 and area to be repaired.
Detailed Description
Example 1
The embodiment discloses an online repair process of a thermoplastic composite material, which comprises the following steps:
(1) carrying out surface treatment on the area to be repaired 7, and removing the damaged area, wherein the treatment modes include but are not limited to deep digging, grinding and cutting; and after treatment, laying a reinforcing fabric 6 in the area 7 to be repaired, wherein the reinforcing fabric 6 is one or a mixture of glass fiber fabric, carbon fiber fabric and aramid fiber fabric. The reinforcement fabric 6 is adopted to connect the area 7 to be repaired and the periphery of the area 7 to be repaired into a whole, so that the overall mechanical property of the area 7 to be repaired is improved, and the service life of the area 7 to be repaired is prolonged.
(2) Heating and pressurizing the resin powder 5, spraying the resin powder 5 to the surface of the reinforcing fabric 6 under the action of high-pressure gas, impacting the surface of the reinforcing fabric 6 by resin powder 5 particles, dispersing fiber bundles into fibers of the reinforcing fabric 6, and simultaneously impacting a part of the resin powder 5 to a region to be repaired through the reinforcing fabric 6 and entering the region to be repaired; on the one hand, part of the kinetic energy of the resin powder 5 is converted into heat energy, and the reinforcing fabric 6 is plasticized and impregnated; on the other hand, the resin powder 5 sprayed to the area to be repaired converts its kinetic energy into thermal energy, so that the resin matrix of the area to be repaired is melted, spatially displaced relative to the sprayed resin, and forms molecular chain segment entanglement.
In the step, the particle size of the resin powder 5 is less than or equal to 100 μm, the heating temperature is 10-100 ℃ lower than the melting point of the resin powder 5, the pressurizing pressure is 0.5-5Mpa, and the spraying distance of the resin powder 5 is 5-70 mm.
(3) Spraying resin powder to wResin powder/(wResin powder+wReinforced fabric) When 50% -70%, wResin powderAnd wReinforced fabricAnd (4) indicating the quality, stopping spraying, cooling and solidifying to enable part of fibers and resin powder 5 in the reinforcing fabric 6 to be meshed with the resin matrix of the area to be repaired, and finishing on-line repair after solidification.
In this embodiment, if the damage of the thermoplastic composite material is serious, the above steps may be repeated to perform the repair again, that is, after the first repair is completed, the reinforcing fabric 6 may be laid again on the basis of the first repair to perform the second or more repairs.
In this embodiment, the online repair process is mainly completed by matching the powder feeding system 1, the energy delivery system 3, the injection system 4 and the high-pressure gas system 2, wherein the powder feeding system 1 can adopt a powder weightlessness scale, the injection system 4 can adopt an injector with a nozzle, the energy delivery system 3 can adopt a heater with a heating chamber, and the high-pressure gas system 2 can adopt a high-pressure gas source of 3 Mpa; the concrete connection structure is as follows: one end of the powder feeding system 1 is connected to a resin powder raw material device (not shown in the figure), and the other end is connected to the energy transmission system 3. One end of the energy transmission system 3 is connected to the high-pressure gas system 2, and the other end is connected to the injection system 4. Wherein, the functions of each system are respectively as follows:
the powder feeding system 1 is used for uniformly conveying the resin powder 5 to the energy conveying system 3, so that uniform distribution of the resin powder 5 in space and uniformity of conveying speed are ensured, and further the stability of feeding is realized.
The energy transmission system 3 is used for heating and pressurizing the resin powder 5, so that the resin powder 5 obtains certain energy for energy conversion in the subsequent repairing process.
The high-pressure air system 2 is used for enabling the resin powder 5 in a static state to obtain kinetic energy and then spraying the kinetic energy from the spraying system 4 to the surface of the reinforcing fabric 6 at a certain speed; in the process: the resin powder 5 impacts the surface of the reinforcing fabric 6, breaks up fiber bundles and disperses the fiber bundles into the fibers of the reinforcing fabric 6, and meanwhile, the resin powder 5 penetrating through the reinforcing fabric 6 impacts the area to be repaired and enters the inside of the area to be repaired; on the one hand, part of the kinetic energy of the resin powder 5 is converted into heat energy, and the reinforcing fabric 6 is plasticized and impregnated; on the other hand, the resin powder 5 sprayed to the area to be repaired converts its kinetic energy into thermal energy, so that the resin matrix of the area to be repaired is melted, spatially displaced relative to the sprayed resin, and forms molecular chain segment entanglement. After the spraying is stopped, the molten resin powder 5 starts to cool and solidify, part of fibers in the reinforcing fabric 6 and the resin powder 5 are meshed with the resin matrix of the area to be repaired, and the online repair is completed after the solidification.
Example 2
The embodiment discloses an online repair process of a thermoplastic composite material, which comprises the following steps:
(1) carrying out surface treatment on the area to be repaired 7, and removing the damaged area, wherein the treatment modes include but are not limited to deep digging, grinding and cutting; and after treatment, laying a reinforcing fabric 6 in the area 7 to be repaired, wherein the reinforcing fabric 6 is one or a mixture of glass fiber fabric, carbon fiber fabric and aramid fiber fabric. The reinforcement fabric 6 is adopted to connect the area 7 to be repaired and the periphery of the area 7 to be repaired into a whole, so that the overall mechanical property of the area 7 to be repaired is improved, and the service life of the area 7 to be repaired is prolonged.
(2) Heating and pressurizing the resin powder 5, spraying the resin powder 5 to the surface of the reinforcing fabric 6 under the action of high-pressure gas, impacting the surface of the reinforcing fabric 6 by resin powder 5 particles, dispersing fiber bundles into fibers of the reinforcing fabric 6, and simultaneously impacting a part of the resin powder 5 to a region to be repaired through the reinforcing fabric 6 and entering the region to be repaired; on the one hand, part of the kinetic energy of the resin powder 5 is converted into heat energy, and the reinforcing fabric 6 is plasticized and impregnated; on the other hand, the resin powder 5 sprayed to the area to be repaired converts its kinetic energy into thermal energy, so that the resin matrix of the area to be repaired is melted, spatially displaced relative to the sprayed resin, and forms molecular chain segment entanglement.
In this step, the particle diameter of the resin powder 5 is 30 μm to 50 μm, the heating temperature is 50 ℃ lower than the melting point of the resin powder 5, the pressurizing pressure is 3Mpa, and the ejection distance of the resin powder 5 is 20 mm.
(3) Spraying resin powder to wResin powder/(wResin powder+wReinforced fabric) And when the percentage is 50 percent, stopping spraying, cooling and solidifying to ensure that part of fibers and resin powder 5 in the reinforcing fabric 6 are meshed with the resin matrix of the area to be repaired, and finishing on-line repair after solidification.
Example 3
The embodiment discloses an online repair process of a thermoplastic composite material, which comprises the following steps:
(1) carrying out surface treatment on the area to be repaired 7, and removing the damaged area, wherein the treatment modes include but are not limited to deep digging, grinding and cutting; and after treatment, laying a reinforcing fabric 6 in the area 7 to be repaired, wherein the reinforcing fabric 6 is one or a mixture of glass fiber fabric, carbon fiber fabric and aramid fiber fabric. The reinforcement fabric 6 is adopted to connect the area 7 to be repaired and the periphery of the area 7 to be repaired into a whole, so that the overall mechanical property of the area 7 to be repaired is improved, and the service life of the area 7 to be repaired is prolonged.
(2) Heating and pressurizing the resin powder 5, spraying the resin powder 5 to the surface of the reinforcing fabric 6 under the action of high-pressure gas, impacting the surface of the reinforcing fabric 6 by resin powder 5 particles, dispersing fiber bundles into fibers of the reinforcing fabric 6, and simultaneously impacting a part of the resin powder 5 to a region to be repaired through the reinforcing fabric 6 and entering the region to be repaired; on the one hand, part of the kinetic energy of the resin powder 5 is converted into heat energy, and the reinforcing fabric 6 is plasticized and impregnated; on the other hand, the resin powder 5 sprayed to the area to be repaired converts its kinetic energy into thermal energy, so that the resin matrix of the area to be repaired is melted, spatially displaced relative to the sprayed resin, and forms molecular chain segment entanglement.
In this step, the particle diameter of the resin powder 5 is 90 μm to 100 μm, the heating temperature is 80 ℃ lower than the melting point of the resin powder 5, the pressurizing pressure is 1 to 2Mpa, and the ejection distance of the resin powder 5 is 60 mm.
(3) Spraying resin powder to wResin powder/(wResin powder+wReinforced fabric) And when the percentage is 70 percent, stopping spraying, cooling and solidifying to ensure that part of fibers and resin powder 5 in the reinforcing fabric 6 are meshed with the resin matrix of the area to be repaired, and finishing on-line repair after solidification.
Example 4
The embodiment discloses an online repair process of a thermoplastic composite material, which comprises the following steps:
(1) carrying out surface treatment on the area to be repaired 7, and removing the damaged area, wherein the treatment modes include but are not limited to deep digging, grinding and cutting; and after treatment, laying a reinforcing fabric 6 in the area 7 to be repaired, wherein the reinforcing fabric 6 is one or a mixture of glass fiber fabric, carbon fiber fabric and aramid fiber fabric. The reinforcement fabric 6 is adopted to connect the area 7 to be repaired and the periphery of the area 7 to be repaired into a whole, so that the overall mechanical property of the area 7 to be repaired is improved, and the service life of the area 7 to be repaired is prolonged.
(2) Heating and pressurizing the resin powder 5, spraying the resin powder 5 to the surface of the reinforcing fabric 6 under the action of high-pressure gas, impacting the surface of the reinforcing fabric 6 by resin powder 5 particles, dispersing fiber bundles into fibers of the reinforcing fabric 6, and simultaneously impacting a part of the resin powder 5 to a region to be repaired through the reinforcing fabric 6 and entering the region to be repaired; on the one hand, part of the kinetic energy of the resin powder 5 is converted into heat energy, and the reinforcing fabric 6 is plasticized and impregnated; on the other hand, the resin powder 5 sprayed to the area to be repaired converts its kinetic energy into thermal energy, so that the resin matrix of the area to be repaired is melted, spatially displaced relative to the sprayed resin, and forms molecular chain segment entanglement.
In this step, the particle diameter of the resin powder 5 is 60 μm to 70 μm, the heating temperature is 60 ℃ lower than the melting point of the resin powder 5, the pressurizing pressure is 3Mpa to 5Mpa, and the ejection distance of the resin powder 5 is 50 mm.
(3) Spraying resin powder to wResin powder/(wResin powder+wReinforced fabric) And when the percentage is 60 percent, stopping spraying, cooling and solidifying to ensure that part of fibers and resin powder 5 in the reinforcing fabric 6 are meshed with the resin matrix of the area to be repaired, and finishing on-line repair after solidification.
Example 5
In this example, the on-line repair process described in examples 1 to 4 was verified by the following method:
1. four portions of the destroyed thermoplastic composite material were respectively repaired using the processes described in examples 1-4 using the undamaged thermoplastic composite material as a control sample, and the repair area was the surface of the object to be repaired. The mechanical properties of the comparison sample which is not damaged and the mechanical properties of each sample after being repaired are as follows:
according to the verification method and the verification result, the online repair of the thermoplastic composite material is realized, the overall mechanical property of the area to be repaired 7 is improved, and the service life of the thermoplastic composite material is effectively prolonged.
While the invention has been described with reference to specific embodiments, any feature disclosed in this specification may be replaced by alternative features serving the same, equivalent or similar purpose, unless expressly stated otherwise; all of the disclosed features, or all of the method or process steps, may be combined in any combination, except mutually exclusive features and/or steps.
Claims (6)
1. An on-line repair process of a thermoplastic composite material is characterized by comprising the following steps: the method comprises the following steps:
(1) carrying out surface treatment on the area to be repaired, and laying a reinforcing fabric in the area to be repaired after the treatment;
(2) heating and pressurizing resin powder, spraying the resin powder to the surface of the reinforcing fabric under the action of high-pressure gas, impacting the surface of the reinforcing fabric by resin powder particles, dispersing fiber bundles into fibers of the reinforcing fabric, and simultaneously impacting part of the resin powder to an area to be repaired through the reinforcing fabric and entering the area to be repaired; on one hand, partial kinetic energy of the resin powder is converted into heat energy, and the reinforcing fabric is plasticized and impregnated; on the other hand, the resin powder sprayed to the area to be repaired converts the kinetic energy of the resin powder into heat energy, so that the resin matrix of the area to be repaired is melted and generates relative displacement with the sprayed resin in space, and molecular chain segment entanglement is formed;
(3) and stopping spraying, cooling and solidifying to enable part of fibers and resin powder in the reinforcing fabric to be meshed with the resin matrix of the area to be repaired, and finishing on-line repair after solidification.
2. The on-line repair process for thermoplastic composites as claimed in claim 1, wherein: the surface treatment of the region to be repaired in step (1) includes, but is not limited to, deep digging, grinding and cutting.
3. The on-line repair process for thermoplastic composites as claimed in claim 1, wherein: the reinforcing fabric in the step (1) is a mixed woven fabric of one or more of glass fiber fabric, carbon fiber fabric and aramid fiber fabric.
4. The on-line repair process for thermoplastic composites as claimed in claim 1, wherein: in the step (2), the particle size of the resin powder is less than or equal to 100 mu m, the heating temperature is 10-100 ℃ lower than the melting point of the resin powder, and the pressurizing pressure is 0.5-5 Mpa.
5. The on-line repair process for thermoplastic composites as claimed in claim 1, wherein: the spraying distance of the resin powder in the step (2) is 5-70 mm.
6. The process for the in-line repair of a thermoplastic composite according to any one of claims 1 to 5, wherein: and (3) feeding the resin powder by a powder feeding system connected to a resin powder raw material device in the step (2), heating and pressurizing the resin powder by an energy transmission system, enabling the resin powder to obtain kinetic energy by a high-pressure gas system, and spraying the resin powder to the surface of the reinforcing fabric by a spraying system.
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| CN113002022B (en) * | 2021-03-25 | 2022-03-08 | 南京工程学院 | Fiber reinforced resin matrix composite material repairing method |
| CN113085229B (en) * | 2021-04-22 | 2022-02-15 | 同济大学 | Device and method for repairing layered damage of carbon fiber reinforced thermosetting resin-based composite material |
| CN114012877B (en) * | 2021-11-12 | 2023-04-21 | 航天特种材料及工艺技术研究所 | Reinforcing method of continuous carbon fiber toughened ceramic matrix composite |
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