CN116765537A - Method for ultra-fast low-damage pre-oxidation auxiliary brazing of carbon fiber reinforced composite material - Google Patents
Method for ultra-fast low-damage pre-oxidation auxiliary brazing of carbon fiber reinforced composite material Download PDFInfo
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Abstract
A method for ultra-fast low-damage pre-oxidation auxiliary brazing of a carbon fiber reinforced composite material relates to a method for pre-oxidation auxiliary brazing of a carbon fiber reinforced composite material. The invention aims to solve the problems of large overall thermal damage to the carbon fiber reinforced composite material, low efficiency and high cost in the pre-oxidation process of the traditional muffle furnace. The method comprises the following steps: 1. the carbon fiber reinforced composite material is subjected to ultra-fast low-damage pre-oxidation; 2. and (5) brazing. The invention is used for ultra-fast low-damage pre-oxidation auxiliary brazing carbon fiber reinforced composite material.
Description
Technical Field
The invention relates to a method for pre-oxidizing auxiliary brazing carbon fiber reinforced composite materials.
Background
In order to improve the mechanical properties of the braze joint of the carbon fiber reinforced composite material, the carbon fiber reinforced composite material is generally subjected to surface treatment, for example, a groove structure is formed by a mechanical drilling or laser etching mode. After the brazing filler metal permeates the groove structure, the contact area of the brazing filler metal and the base metal is obviously increased, and a pinning structure is formed. In recent years, a new type of pre-oxidized carbon fiber reinforced composite material has been developed. For example, for a C/C composite, the pyrolytic carbon matrix of the C/C composite is oxidized at a temperature due to the different oxidation resistance of the pyrolytic carbon matrix than the carbon fibers, which remain to form a root-like pinning structure. However, conventional oxidation is usually performed in a muffle furnace, and the entire base material is required to be subjected to a high-temperature oxidation atmosphere. Although this method can improve the mechanical strength of the joint, it also causes serious oxidation damage to the base material, and deteriorates the base material performance.
Disclosure of Invention
The invention aims to solve the problems of large overall thermal damage, low efficiency and high cost of a carbon fiber reinforced composite material in the pre-oxidation process of a traditional muffle furnace, and further provides a method for brazing the carbon fiber reinforced composite material in an ultra-fast low-damage pre-oxidation auxiliary manner.
A method for ultra-fast low-damage pre-oxidation auxiliary brazing of a carbon fiber reinforced composite material comprises the following steps:
1. ultra-fast low-damage pre-oxidation of carbon fiber reinforced composite material:
respectively fixing two ends of a sheet-shaped carbon-based material on a positive electrode and a negative electrode, then placing a carbon fiber reinforced composite material on the sheet-shaped carbon-based material, and pre-oxidizing the surface to be soldered of the carbon fiber reinforced composite material by utilizing Joule heat generated by the sheet-shaped carbon-based material under the conditions of an air atmosphere and a direct current power supply of 10A-100A at the joint of the surface to be soldered of the carbon fiber reinforced composite material and the surface of the sheet-shaped carbon-based material until the sheet-shaped carbon-based material is broken, and stopping pre-oxidation to obtain the pre-oxidized carbon fiber reinforced composite material;
2. brazing:
assembling the pre-oxidized carbon fiber reinforced composite material, the brazing filler metal foil and the parent metal to be welded to obtain an assembly part, wherein the vacuum degree is less than or equal to 10 -2 Under the conditions of Pa and heating rate of 5 ℃/min-25 ℃/min, the brazing temperature is heated to 300 ℃ to 1500 ℃, and then the vacuum degree is less than or equal to 10 -2 And (3) preserving heat for 1-60 min under the conditions of Pa and brazing temperature of 300-1500 ℃, and finally cooling to finish the method for ultra-fast low-damage pre-oxidation auxiliary brazing of the carbon fiber reinforced composite material.
The beneficial effects of the invention are as follows:
1. the invention helps to reduce damage to the carbon fiber reinforced composite material. When joule heat of the sheet-like carbon-based material is used as a heat source, a non-uniform temperature field is formed on the surface of the carbon fiber reinforced composite material. The carbon fiber reinforced composite material side contacted with the heat source is at the high temperature end, and the carbon fiber reinforced composite material side far away from the heat source is at the low temperature end, so that the surface of the carbon fiber reinforced composite material contacted with the heat source is remarkably oxidized, and the surface of the carbon fiber reinforced composite material far away from the heat source is less oxidized and damaged. And brazing the pre-oxidized carbon fiber reinforced composite material, wherein the brazing filler metal permeates the oxidized holes to heal the oxidized holes, and the connecting area of the brazing filler metal and the carbon fiber reinforced composite material is increased to form a pinning structure, so that the mechanical property is improved. For example, the C/C composite material in the 10mm distance from the heat source in the first embodiment has a temperature lower than 800 ℃ and has a similar surface morphology to the original C/C composite material without obvious oxidation holes. The temperature of the C/C composite material contacting the heat source side is higher than 1200 ℃, and annular oxidation holes appear on the surface.
2. The invention provides a more controllable technological parameter regulation strategy by utilizing the characteristic that the carbon-based material is subjected to self-oxidation fracture to forcedly stop the test. The traditional strategy adopts the power-on time and the current as the parameters of thermal shock, and the test stability is not high. The invention adopts the upper limit of self oxidation of the carbon-based material (the upper limit of self oxidation depends on the type and size of the material) as a controllable variable, and has stronger test stability. Because the thermal shock speed is high and the time is extremely short, and the thermal shock is limited by the control precision of equipment, the contact degree of a clamp and a carbon-based material and other artificial uncontrollable factors, in the practical test, the temperature of a heat source still has deviation of 100-500 ℃ under the condition of adopting identical current and energizing time. Therefore, when the traditional current and time are used as variable control parameters, the test effect is unstable. The invention uses the oxidation fracture characteristic of the carbon-based material heat source, adopts the size of the carbon-based material as an important variable in the test, and innovatively uses the fracture of the carbon-based material as a mark for ending the actual test. Since both the carbon-based material and the carbon fiber reinforced composite material undergo an oxidation process, the degree of oxidation of the carbon fiber reinforced composite material will remain consistent when the uniform specification carbon-based material is oxidized and broken during the repeatability test. When the carbon-based material is used as a heat source, the oxidation behavior of the carbon-based material can occur in a high-temperature environment, and when the upper limit of the oxidation of the carbon-based material is reached, the carbon-based material breaks and the oxidation of the carbon fiber reinforced composite material is forcedly stopped. Since the upper limit of oxidation of the same size and the same carbon-based material itself is a constant controllable variable, unstable parameters such as the energization time and the current can be replaced.
3. The invention is beneficial to reducing the production cost and the energy consumption. The pre-oxidation in the traditional muffle furnace is mainly heated by using the heat radiation of the resistance components in the furnace chamber, and the power is usually several kilowatts to tens of kilowatts. The mode is used for heating the carbon fiber reinforced composite material, so that less energy is required, most of energy is dissipated into the environment, and energy conservation and emission reduction are not facilitated. In the invention, joule heat of the sheet carbon-based material is used as a heat source, the power of the first pre-oxidation is lower than 800W, and the energy utilization rate is obviously improved.
4. The invention is helpful for improving the production efficiency. The total treatment time of the traditional muffle furnace pre-oxidation is long. The preheating time can be greatly reduced, and the pre-oxidation time is lower than 30s in the embodiment. Thus, this method can reduce the total treatment time and improve the pre-oxidation efficiency.
The invention provides a method for ultra-fast low-damage pre-oxidation auxiliary brazing of a carbon fiber reinforced composite material.
Drawings
FIG. 1 is a schematic illustration of a step one ultra-fast low damage pre-oxidation in accordance with the present invention;
FIG. 2 is a graph of the surface morphology of the pre-oxidized carbon fiber reinforced composite material prepared in step one of the example (first set of experiments);
FIG. 3 is a graph of the surface morphology of the pre-oxidized carbon fiber reinforced composite material prepared in step one of the examples (second set of experiments);
FIG. 4 is a graph of the surface topography of the C/C composite at 10mm from the heat source (first set of experiments).
Detailed Description
The first embodiment is as follows: the method for ultra-fast low-damage pre-oxidation auxiliary brazing of the carbon fiber reinforced composite material comprises the following steps of:
1. ultra-fast low-damage pre-oxidation of carbon fiber reinforced composite material:
respectively fixing two ends of a sheet-shaped carbon-based material on a positive electrode and a negative electrode, then placing a carbon fiber reinforced composite material on the sheet-shaped carbon-based material, and pre-oxidizing the surface to be soldered of the carbon fiber reinforced composite material by utilizing Joule heat generated by the sheet-shaped carbon-based material under the conditions of an air atmosphere and a direct current power supply of 10A-100A at the joint of the surface to be soldered of the carbon fiber reinforced composite material and the surface of the sheet-shaped carbon-based material until the sheet-shaped carbon-based material is broken, and stopping pre-oxidation to obtain the pre-oxidized carbon fiber reinforced composite material;
2. brazing:
assembling the pre-oxidized carbon fiber reinforced composite material, the brazing filler metal foil and the parent metal to be welded to obtain an assembly part, wherein the vacuum degree is less than or equal to 10 -2 Under the conditions of Pa and heating rate of 5 ℃/min-25 ℃/min, the brazing temperature is heated to 300 ℃ to 1500 ℃, and then the vacuum degree is less than or equal to 10 -2 And (3) preserving heat for 1-60 min under the conditions of Pa and brazing temperature of 300-1500 ℃, and finally cooling to finish the method for ultra-fast low-damage pre-oxidation auxiliary brazing of the carbon fiber reinforced composite material.
FIG. 1 is a schematic diagram of a step one ultra-fast low damage pre-oxidation according to the present invention. As can be seen from the figure, the conductive sheet-shaped carbon-based material is charged with direct current by using the sheet-shaped carbon-based material as a heat source, and the carbon fiber reinforced composite material is heated by heat conduction to oxidize the surface of the carbon fiber reinforced composite material. And the surface only contacting the sheet-shaped carbon-based material bears higher temperature in the pre-oxidation process, so that the surface is pre-oxidized to form an annular gap, and the temperature at a position far away from the sheet-shaped carbon-based material is lower due to the limited heat penetration capability of the sheet-shaped carbon-based material, so that the pre-oxidation damage is smaller, and the whole thermal damage of the material is smaller.
The beneficial effects of this embodiment are:
1. this embodiment helps to reduce damage to the carbon fiber reinforced composite. When joule heat of the sheet-like carbon-based material is used as a heat source, a non-uniform temperature field is formed on the surface of the carbon fiber reinforced composite material. The carbon fiber reinforced composite material side contacted with the heat source is at the high temperature end, and the carbon fiber reinforced composite material side far away from the heat source is at the low temperature end, so that the surface of the carbon fiber reinforced composite material contacted with the heat source is remarkably oxidized, and the surface of the carbon fiber reinforced composite material far away from the heat source is less oxidized and damaged. And brazing the pre-oxidized carbon fiber reinforced composite material, wherein the brazing filler metal permeates the oxidized holes to heal the oxidized holes, and the connecting area of the brazing filler metal and the carbon fiber reinforced composite material is increased to form a pinning structure, so that the mechanical property is improved. For example, the C/C composite material in the 10mm distance from the heat source in the first embodiment has a temperature lower than 800 ℃ and has a similar surface morphology to the original C/C composite material without obvious oxidation holes. The temperature of the C/C composite material contacting the heat source side is higher than 1200 ℃, and annular oxidation holes appear on the surface.
2. The present embodiment provides a more controllable strategy for regulating process parameters by utilizing the characteristic of the carbon-based material itself to oxidize and break to forcibly terminate the test. The traditional strategy adopts the power-on time and the current as the parameters of thermal shock, and the test stability is not high. In the embodiment, the upper limit of self-oxidation of the carbon-based material (the upper limit of self-oxidation depends on the type and size of the material) is used as a controllable variable, so that the test stability is higher. Because the thermal shock speed is high and the time is extremely short, and the thermal shock is limited by the control precision of equipment, the contact degree of a clamp and a carbon-based material and other artificial uncontrollable factors, in the practical test, the temperature of a heat source still has deviation of 100-500 ℃ under the condition of adopting identical current and energizing time. Therefore, when the traditional current and time are used as variable control parameters, the test effect is unstable. In the present embodiment, the size of the carbon-based material is used as an important variable in the test by utilizing the oxidation fracture characteristics of the carbon-based material heat source itself, and the fracture of the carbon-based material is innovatively used as a mark for the actual test. Since both the carbon-based material and the carbon fiber reinforced composite material undergo an oxidation process, the degree of oxidation of the carbon fiber reinforced composite material will remain consistent when the uniform specification carbon-based material is oxidized and broken during the repeatability test. When the carbon-based material is used as a heat source, the oxidation behavior of the carbon-based material can occur in a high-temperature environment, and when the upper limit of the oxidation of the carbon-based material is reached, the carbon-based material breaks and the oxidation of the carbon fiber reinforced composite material is forcedly stopped. Since the upper limit of oxidation of the same size and the same carbon-based material itself is a constant controllable variable, unstable parameters such as the energization time and the current can be replaced.
3. The embodiment is beneficial to reducing the production cost and the energy consumption. The pre-oxidation in the traditional muffle furnace is mainly heated by using the heat radiation of the resistance components in the furnace chamber, and the power is usually several kilowatts to tens of kilowatts. The mode is used for heating the carbon fiber reinforced composite material, so that less energy is required, most of energy is dissipated into the environment, and energy conservation and emission reduction are not facilitated. In the embodiment, joule heat of a sheet-shaped carbon-based material is used as a heat source, the power of the first pre-oxidation is lower than 800W, and the energy utilization rate is remarkably improved.
4. This embodiment contributes to improvement in production efficiency. The total treatment time of the traditional muffle furnace pre-oxidation is long. The preheating time can be greatly reduced in this embodiment, and the pre-oxidation is lower than 30s as in the embodiment. Thus, this method can reduce the total treatment time and improve the pre-oxidation efficiency.
The second embodiment is as follows: the first difference between this embodiment and the specific embodiment is that: the sheet-shaped carbon-based material in the first step is carbon cloth, carbon paper, carbon felt, graphite felt, graphene film, carbon nanotube film or carbon fiber film. The other is the same as in the first embodiment.
And a third specific embodiment: this embodiment differs from one or both of the embodiments in that: the upper surface area of the sheet-shaped carbon-based material in the first step is larger than the surface to be brazed of the carbon fiber reinforced composite material, and the thickness of the sheet-shaped carbon-based material is 1 mm-8 mm. The other is the same as the first or second embodiment.
The specific embodiment IV is as follows: this embodiment differs from one of the first to third embodiments in that: the carbon fiber reinforced composite material in the first step is a C/C composite material, a C/SiC composite material or a C/C-SiC composite material. The other embodiments are the same as those of the first to third embodiments.
Fifth embodiment: this embodiment differs from one to four embodiments in that: in the first step, under the conditions of air atmosphere and direct current power supply current of 10A-100A, the surface temperature of the sheet-shaped carbon-based material reaches 800-2000 ℃ due to the Joule heat generated by the sheet-shaped carbon-based material. The other embodiments are the same as those of the first to fourth embodiments.
Specific embodiment six: this embodiment differs from one of the first to fifth embodiments in that: and testing the surface temperature of the sheet carbon-based material by using an infrared temperature measuring gun, a thermal infrared imager or a thermocouple. The other embodiments are the same as those of the first to fifth embodiments.
Seventh embodiment: this embodiment differs from one of the first to sixth embodiments in that: the solder foil in the second step is AgCuTi solder, snAgCu solder, agCuInTi solder, tiZrNiCu solder, tiCu solder, snAgCu solder, BNi2 solder or BNi5 solder. The other embodiments are the same as those of the first to sixth embodiments.
Eighth embodiment: this embodiment differs from one of the first to seventh embodiments in that: the thickness of the solder foil in the second step is 50-200 microns. The other is the same as in embodiments one to seven.
Detailed description nine: this embodiment differs from one to eight of the embodiments in that: the base metal to be welded in the second step is a pre-oxidized C/C composite material, a pre-oxidized C/SiC composite material, a pre-oxidized C/C-SiC composite material, a titanium alloy, stainless steel, nickel-based alloy, metallic niobium, aluminum alloy, aluminum oxide ceramic, zirconia ceramic, graphite or silicon carbide ceramic. The others are the same as in embodiments one to eight.
Detailed description ten: this embodiment differs from one of the embodiments one to nine in that: and step two, cooling with a furnace or cooling at a cooling speed of 5-25 ℃ per minute. The others are the same as in embodiments one to nine.
The following examples are used to verify the benefits of the present invention:
embodiment one:
a method for ultra-fast low-damage pre-oxidation auxiliary brazing of a carbon fiber reinforced composite material comprises the following steps:
1. ultra-fast low-damage pre-oxidation of carbon fiber reinforced composite material:
respectively fixing two ends of a sheet-shaped carbon-based material on a positive electrode and a negative electrode, then placing a carbon fiber reinforced composite material on the sheet-shaped carbon-based material, and pre-oxidizing the surface to be soldered of the carbon fiber reinforced composite material by utilizing Joule heat generated by the sheet-shaped carbon-based material under the conditions of an air atmosphere and 30A of direct current power supply current at the joint of the surface to be soldered of the carbon fiber reinforced composite material and the surface of the sheet-shaped carbon-based material until the sheet-shaped carbon-based material is broken, and stopping pre-oxidation to obtain the pre-oxidized carbon fiber reinforced composite material;
2. brazing:
assembling the pre-oxidized carbon fiber reinforced composite material, the brazing filler metal foil and the parent metal to be welded to obtain an assembly part, wherein the vacuum degree is 10 -3 Heating the brazing temperature to 750 ℃ under the conditions of Pa and heating rate of 15 ℃/min, and then carrying out vacuum degree of 10 -3 And (3) under the conditions of Pa and brazing temperature of 750 ℃, preserving heat for 10min, and finally cooling at a cooling speed of 5 ℃/min to finish the method of the ultra-fast low-damage pre-oxidation auxiliary brazing carbon fiber reinforced composite material, thereby obtaining the pre-oxidation auxiliary carbon fiber reinforced composite material/TC 4 titanium alloy welding piece.
The sheet-shaped carbon-based material in the first step is graphite felt with the dimensions of 15mm multiplied by 30mm multiplied by 4mm (thickness).
The carbon fiber reinforced composite material in the first step is a three-dimensional braided C/C composite material, and the size is 5mm multiplied by 10mm (thickness).
The carbon fiber reinforced composite material in the first step is a pretreated carbon fiber reinforced composite material, and the pretreatment is carried out according to the following steps: polishing the carbon fiber reinforced composite material, and then respectively using ethanol and deionized water for ultrasonic cleaning to remove surface impurities.
Setting the equipment parameters as 30A/30s (equipment set values), and testing the surface temperature of the sheet-shaped carbon-based material by using an infrared temperature measuring gun under the conditions of air atmosphere and 30A of direct current power supply current.
The solder foil in the second step is AgCuInTi solder with the thickness of 80 microns.
And in the second step, the parent metal to be welded is TC4 titanium alloy, and the size is 10mm multiplied by 3mm (thickness).
Example one test condition, the pre-oxidation power was 634W.
Two repeated experiments were performed according to the process of example one, and at 30A/30s (equipment set point), the peak temperatures of two experiments with the same size for graphite felt were 1532 ℃ (first set of experiments) and 1715 ℃ (second set of experiments), respectively, due to the influence of uncontrollable factors, indicating that even if the current and time were the same, different heat source temperatures could be caused, making the stability of the experiment not high. However, the upper limit of oxidation resistance of the graphite felt with the same size is the same as the heat source, and the graphite felt breaks when oxidized to the same degree, which also causes the carbon fiber reinforced composite material on the graphite felt to have the same oxidation degree. The first set of test peak temperatures was lower than the second set of test temperatures, and the first set was such that at 28s, the graphite felt had oxidative cracking to force the test to cease. The second set of tests was high in temperature, it broken by oxidation at 23s, and the test was forcibly stopped. The strategy can enable the carbon fiber reinforced composite material to present the same oxidation degree despite different temperatures and time, so that the effect is more controllable:
first set of tests: the pre-oxidized carbon fiber reinforced composite material prepared in the first step has a weight loss rate of 2.38%, and the second group of tests: the pre-oxidized carbon fiber reinforced composite material prepared in the first step has the weight loss rate of 2.31 percent, and can be considered to have no obvious difference in the error range, so that the effect of the regulation strategy is controllable. And the C/C composite material is oxidized in a uniform high-temperature environment (1200 ℃/30 s), the overall oxidation damage of the C/C composite material occurs, and the weight loss rate of the C/C composite material is 5.3%.
FIG. 2 is a graph of the surface morphology of the pre-oxidized carbon fiber reinforced composite material prepared in step one of the example (first set of experiments); FIG. 3 is a graph of the surface morphology of the pre-oxidized carbon fiber reinforced composite material prepared in step one of the examples (second set of experiments); as can be seen from the figure, the matrix in the C/C composite material is significantly oxidized and corroded to form annular holes. The formation of such annular oxidation pores depends on preferential oxidation of the carbon matrix at high temperatures, the oxidized carbon matrix first forming a micro-trench structure, the trench forming providing a channel for oxygen diffusion, thereby exacerbating the oxidation of the carbon matrix. The oxidation pore size is limited by the rate of reaction of the carbon matrix with oxygen. As the temperature increases, oxidation is intensified, and oxidation pores gradually extend from the surface layer to the deep layer of the material. And the graph shows that the morphology of the two groups of repeated experiments is not obviously different, and the effect of the regulation strategy is controllable.
Comparison experiment: the first difference between this comparative experiment and the example is: and (3) eliminating the preoxidation in the first step, and obtaining the carbon fiber reinforced composite material/TC 4 titanium alloy welding piece in the second step. The other is the same as in the first embodiment.
After oxidation, the solder permeates into the annular gap, forming a pinning structure. The structure can effectively increase the contact area of the brazing filler metal and the base metal and prevent crack growth. In addition, the property of the solder penetration area is between the base metal and the solder, so that a transition area is formed, and the problem of mismatch of thermal expansion coefficients is effectively relieved. In addition, the pre-oxidation current has a great influence on the mechanical properties of the C/C composite material and the TC4 joint. As the current increases, the intensity increases and then decreases.
Under the condition of the shearing speed of 0.5mm/min, the shearing strength of the comparative experiment carbon fiber reinforced composite material/TC 4 titanium alloy welding piece is 13.4MPa. Example one pre-oxidized auxiliary carbon fiber reinforced composite/TC 4 titanium alloy weld (first set of tests) reached a joint strength of 25.1MPa. Example one pre-oxidized auxiliary carbon fiber reinforced composite/TC 4 titanium alloy weld (second set of tests) reached a joint strength of 25.5MPa. The average joint strength for both sets of tests was 25.3MPa.
Because the penetration capability of the graphite felt to the C/C composite material is limited, the surface temperature of the C/C composite material at the side of the graphite felt is higher than 1200 ℃, and the oxidation corrosion effect is good. 10mm from the heat source, the C/C composite is similar to the original morphology, as shown in FIG. 4, FIG. 4 is a graph of the surface morphology of the C/C composite 10mm from the heat source (first set of experiments); the peak temperature was 765 deg.c at 10mm from the heat source and 1325 deg.c at 3mm from the heat source. This is illustrated by the selective oxidation of only the C/C composite material near the heat source end, with less oxidative damage to the C/C composite material as a whole.
Claims (10)
1. The method for ultra-fast low-damage pre-oxidation auxiliary brazing of the carbon fiber reinforced composite material is characterized by comprising the following steps of:
1. ultra-fast low-damage pre-oxidation of carbon fiber reinforced composite material:
respectively fixing two ends of a sheet-shaped carbon-based material on a positive electrode and a negative electrode, then placing a carbon fiber reinforced composite material on the sheet-shaped carbon-based material, and pre-oxidizing the surface to be soldered of the carbon fiber reinforced composite material by utilizing Joule heat generated by the sheet-shaped carbon-based material under the conditions of an air atmosphere and a direct current power supply of 10A-100A at the joint of the surface to be soldered of the carbon fiber reinforced composite material and the surface of the sheet-shaped carbon-based material until the sheet-shaped carbon-based material is broken, and stopping pre-oxidation to obtain the pre-oxidized carbon fiber reinforced composite material;
2. brazing:
assembling the pre-oxidized carbon fiber reinforced composite material, the brazing filler metal foil and the parent metal to be welded to obtain an assembly part, wherein the vacuum degree is less than or equal to 10 -2 Under the conditions of Pa and heating rate of 5 ℃/min-25 ℃/min, the brazing temperature is heated to 300 ℃ to 1500 ℃, and then the vacuum degree is less than or equal to 10 -2 And (3) preserving heat for 1-60 min under the conditions of Pa and brazing temperature of 300-1500 ℃, and finally cooling to finish the method for ultra-fast low-damage pre-oxidation auxiliary brazing of the carbon fiber reinforced composite material.
2. The method for ultra-fast low-damage pre-oxidation-assisted brazing of carbon fiber reinforced composite material according to claim 1, wherein the sheet-like carbon-based material in the first step is carbon cloth, carbon paper, carbon felt, graphite felt, graphene film, carbon nanotube film or carbon fiber film.
3. The method for ultra-fast low-damage pre-oxidation auxiliary brazing of carbon fiber reinforced composite material according to claim 2, wherein the upper surface area of the sheet-shaped carbon-based material in the first step is larger than the surface to be brazed of the carbon fiber reinforced composite material, and the thickness of the sheet-shaped carbon-based material is 1 mm-8 mm.
4. The method for ultra-fast low-damage pre-oxidation assisted brazing of carbon fiber reinforced composites according to claim 1, wherein the carbon fiber reinforced composites in step one are C/C composites, C/SiC composites or C/C-SiC composites.
5. The method for ultra-fast low-damage pre-oxidation auxiliary brazing of carbon fiber reinforced composite material according to claim 1, wherein in the first step, the surface temperature of the sheet-shaped carbon-based material is 800-2000 ℃ by joule heat generated by the sheet-shaped carbon-based material under the conditions of air atmosphere and 10-100A of direct current power supply current.
6. The method for ultra-fast low-damage pre-oxidation-assisted brazing of carbon fiber reinforced composites according to claim 5, wherein the surface temperature of the sheet-like carbon-based material is measured by an infrared thermometer, a thermal infrared imager or a thermocouple.
7. The method for ultra-fast low-damage pre-oxidation auxiliary brazing carbon fiber reinforced composite material according to claim 1, wherein the brazing filler metal foil in the second step is AgCuTi brazing filler metal, snAgCu brazing filler metal, agCuInTi brazing filler metal, tiZrNiCu brazing filler metal, tiCu brazing filler metal, snAgCu brazing filler metal, BNi2 brazing filler metal or BNi5 brazing filler metal.
8. The method for ultra-fast low-damage pre-oxidation assisted brazing of carbon fiber reinforced composites according to claim 7, wherein the brazing foil in step two has a thickness of 50 to 200 microns.
9. The method for ultra-fast low-damage pre-oxidation assisted brazing of carbon fiber reinforced composite material according to claim 1, wherein the base material to be welded in the second step is a pre-oxidized C/C composite material, a pre-oxidized C/SiC composite material, a pre-oxidized C/C-SiC composite material, a titanium alloy, stainless steel, a nickel-based alloy, metallic niobium, an aluminum alloy, an aluminum oxide ceramic, a zirconium oxide ceramic, graphite or a silicon carbide ceramic.
10. The method for ultra-fast low-damage pre-oxidation auxiliary brazing of carbon fiber reinforced composite material according to claim 1, wherein in the second step, cooling is carried out by adopting furnace-following cooling or cooling speed is 5-25 ℃/min.
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