CN108568577A - A method of improving carbon fibre reinforced composite and solder bonding metal strength of joint - Google Patents
A method of improving carbon fibre reinforced composite and solder bonding metal strength of joint Download PDFInfo
- Publication number
- CN108568577A CN108568577A CN201710134324.8A CN201710134324A CN108568577A CN 108568577 A CN108568577 A CN 108568577A CN 201710134324 A CN201710134324 A CN 201710134324A CN 108568577 A CN108568577 A CN 108568577A
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- reinforced composite
- fibre reinforced
- carbon fibre
- solder
- carbon
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K1/00—Soldering, e.g. brazing, or unsoldering
- B23K1/008—Soldering within a furnace
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K1/00—Soldering, e.g. brazing, or unsoldering
- B23K1/20—Preliminary treatment of work or areas to be soldered, e.g. in respect of a galvanic coating
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Ceramic Products (AREA)
Abstract
The present invention discloses a kind of method improving carbon fibre reinforced composite and solder bonding metal strength of joint, oxidation processes is carried out to carbon fibre reinforced composite surface in 700 DEG C~800 DEG C temperature ranges first, so as to form cyclic annular hole on carbon fiber periphery；Reselection solder assembles carbon fibre reinforced composite, solder and metallic plate according to sandwiched type structure, and is clamped with graphite plate, ensures to be in close contact, then places it in vacuum brazing furnace and vacuumize and be brazed.The present invention forms cyclic annular hole by carrying out surface oxidation treatment to carbon fibre reinforced composite before welding, solder is infiltrated up in the hole of carbon fibre reinforced composite, the contact area of carbon fibre reinforced composite and solder is set to increase so that conversion zone area increases, to the intensity for reducing connector residual stress He improving connector.
Description
Technical field
The present invention relates to be modified raising carbon fibre reinforced composite by surface in soldering field to connect with solder bonding metal
The method of head intensity is more particularly related to one kind and is formed on carbon fibre reinforced composite surface by preoxidation process
To reduce soldered fitting residual stress and increase the method for effective connection area, these two aspects improves soldering and connects Micro porosity jointly
The intensity of head.
Background technology
Carbon fibre reinforced composite has density low, and elasticity modulus is high, specific strength is big, coefficient of thermal expansion is low, corrosion-resistant, suction
The superior performances such as pinking is good, frictional property is good, thermal conductivity is high, in addition its high-temperature behavior is equally excellent, as high temperature resistant, resistance to ablation,
Anti-thermal shock and thermal fatigue are good, still have higher intensity and toughness etc. when more than 2000 DEG C.Therefore, fibre reinforced is compound
Material is considered as very ideal high-temperature structural material, and in the plate armour of aerospace field and international nuclear tests reactor
It is applied in material.However, due to the limitation of its own manufacturing process, it is difficult to prepare that size is big and complex-shaped component,
And the production cycle is long, and it is of high cost, its application is greatly limited, therefore consider itself and metal being attached, with
Convenient for expanding its application field.
Currently, the connection of carbon fibre reinforced composite and metal is widely studied, especially based on soldering.However, due to
The coefficient of thermal expansion difference of carbon fibre reinforced composite and metal is larger, in postwelding cooling procedure, metal, solder and carbon fiber
Dimension enhancing composite material shrinkage degree it is different so that in soldered fitting especially carbon fibre reinforced composite side exist compared with
Big residual stress, the mechanical property of connector will be greatly reduced in this, and connecting elements is made to be difficult to meet application requirement.Although existing lead to
The method that is machined on carbon fibre reinforced composite surface is crossed to alleviate residual stress, but itself all Shortcomings, such as adopted
With the method for laser grooving, cost is higher, and controls relative complex；And mechanical punching is used, uniformity is relatively poor, makes
It is uneven at entire strength of joint.It is therefore proposed that a kind of new alleviation connector residual stress, improves the process of strength of joint
With good realistic meaning.
Invention content
It is an object of the invention to overcome the shortcomings of the prior art in terms of improving strength of joint, and provide a kind of increase carbon
Fibre reinforced composites and solder contact area, and the method for reducing residual stress are made using heating gaseous oxidation processing
The method that carbon fibre reinforced composite surface generates uniform Micro porosity changes carbon fibre reinforced composite surface topography,
So as to improve the intensity of soldered fitting.
The purpose of the present invention is achieved by following technical proposals：
A method of carbon fibre reinforced composite and solder bonding metal strength of joint are improved, is carried out as steps described below：
Oxidation processes are carried out to carbon fibre reinforced composite surface in 700 DEG C~800 DEG C temperature ranges, so that in carbon fiber periphery shape
Circlewise hole；Then the carbon fibre reinforced composite of oxidation processes, solder and metallic plate are filled according to sandwiched type structure
Match, and be clamped with graphite plate, ensure to be in close contact, place it in vacuum brazing furnace and vacuumize, in stove pressure reach 8~
9×10-4After MPa, brazing filler metal fusing point 20-150 is elevated above for 20-25 degrees Celsius from room temperature with the heating rate of 5-10 DEG C/min
Degree Celsius temperature and heat preservation be brazed, then 20-25 degrees Celsius of room temperature is down to the rate of temperature fall of 5~10 DEG C/min.
In the above-mentioned technical solutions, pricker is elevated above for 20-25 degrees Celsius from room temperature with the heating rate of 5-10 DEG C/min
Expect the temperature of 50-100 degrees Celsius of fusing point and 5-20min of heat preservation are brazed, then is down to the rate of temperature fall of 5~10 DEG C/min
20-25 degrees Celsius of room temperature.
In the above-mentioned technical solutions, removing surface is carried out to sample before weldering, is polishing to 800# using sand paper, cleaning agent is used in combination
It is cleaned by ultrasonic 5~10min, naturally dry.
In the above-mentioned technical solutions, carbon fibre reinforced composite is polishing to 800# with sand paper before oxidation, then in horse
Not oxidation processes are carried out in the non-protected gas type resistance furnace such as stove.
In the above-mentioned technical solutions, to carbon fibre reinforced composite surface carry out oxidation processes time be 5~
10min。
In the above-mentioned technical solutions, oxygen is carried out to carbon fibre reinforced composite surface in 700 DEG C~800 DEG C temperature ranges
Change is handled, and the partial thermal decomposition carbon around carbon fiber is consumed, and carbon fiber is seldom consumed, to form ring on carbon fiber periphery
Shape hole, about 1~2 μm of width.
In the above-mentioned technical solutions, according to the selection principle of solder, such as ensure that wetability, the diffusion of solder and base material are made
With fusion temperature reasonability etc. selects solder appropriate to select the silver-based or copper base solder of titaniferous according to the above principle.
Carbon fibre reinforced composite oxidation processes are improving carbon fibre reinforced composite and solder bonding metal strength of joint
In application, 700 DEG C~800 DEG C temperature ranges to carbon fibre reinforced composite surface carry out oxidation processes so that in carbon
Fibre periphery forms cyclic annular hole.
The present invention forms cyclic annular hole, solder leaching by carrying out surface oxidation treatment to carbon fibre reinforced composite before welding
It is seeped into the hole of carbon fibre reinforced composite, so that the contact area of carbon fibre reinforced composite and solder is increased so that anti-
Level product is answered to increase, and because of coefficient of thermal expansion between carbon fibre reinforced composite and metal solder and base material metal interface
Gap cause to shrink it is inconsistent caused by residual stress pass through carbon fibre reinforced composite and the interlaced portion of solder
Divide and small deformation occurs and is released (as shown in Fig. 2 b, c and d), to reduce connector residual stress, so as to improve connecing
The intensity of head.
Description of the drawings
Fig. 1 is the surface shape kept the temperature at a temperature of original carbon carbon composite and 700 DEG C, 750 DEG C, 800 DEG C after oxidation in 5 minutes
The SEM pictures of looks.
Fig. 2 be original carbon carbon composite and 700 DEG C, 750 DEG C, brazing temperature is 880 DEG C of heat preservations after 800 DEG C of oxidations
The SEM pictures of the micro interface pattern of 10min.
Fig. 3 be original carbon carbon composite and 700 DEG C, 750 DEG C, after 800 DEG C of oxidations soldered fitting shearing strength picture.
Specific implementation mode
Technical scheme of the present invention is described in detail below with reference to specific embodiment.
Embodiment one：
Brazing tests (are purchased from Changsha Bo Yun new materials Co., Ltd, increased as carbon fiber using the carbon carbon composite of 3D
Strong composite material uses, carbon fiber and pyrolytic carbon composition), thick 100 μm of Ag-21Cu-4.5Ti (21wt%Cu, 4.5wt%Ti,
Remaining as Ag, 100wt% is added up to) paillon (as brazing solder) and pure Nb plates (purity>99.9%, as metallic plate).Carbon
Carbon composite size is 4mm × 4mm × 6mm, 800# is polishing to SiC sand paper before oxidation, then with 10 in Muffle furnace
DEG C/material put into Noah's ark merging stove after rising to 700 DEG C, 750 DEG C, 800 DEG C and keeps the temperature 5min to carry out by the heating rate of min
Oxidation processes, carbon carbon composite, which is divided into, not to be dealt with and respectively in 700 DEG C, 750 DEG C, 800 DEG C of four groups of heat preservation 5min processing totally.
It is 4mm × 4mm × 6mm that Ag-21Cu-4.5Ti paillons, which are cut into size, and Nb board sizes are 15mm × 10mm × 2mm, equally use SiC
Sand paper is polishing to 800#, later, all samples is cleaned by ultrasonic to ten minutes and naturally dry in acetone cleaning agent, then by four
Group sample assembles according to sandwich pattern and is clamped, be placed in vacuum brazing furnace and vacuumized with graphite plate, waits for that pressure reaches in stove
8.8×10-4After Pa, 880 DEG C of heat preservation 10min are risen to the heating rate of 10 DEG C/min, are down to later with the speed of 5 DEG C/min
500 DEG C, then it is down to room temperature with stove, finally take out.
Microscopic appearance after the oxidation of carbon carbon composite different temperatures is as shown in Figure 1, it can be seen that two on the section of each figure
A carbon fiber works out direction, and left side is to be parallel to surface, and Right vertical is in surface, after the oxidation processes by different temperatures,
The pyrolytic carbon filled around carbon fiber is partially oxidized consumption, forms cyclic annular hole, and with the raising carbon fiber week of temperature
The size and depth of the annular hole enclosed are all increasing.
Postwelding cuts sample and is inlayed and sand paper grinding and buffing, treated sample, using scanning
Electronic Speculum (SEM；NanoSEM430 the microscopic appearance for) observing postwelding sample under different oxidizing conditions, as shown in Fig. 2, in Fig. 2 a and b
Partial enlarged view in it can be seen that carbon carbon composite and solder interface form conversion zone, it is obtained according to gamma-spectrometric data
It is made of TiC.Comparison diagram 2a, b, c and d have found that, with the increase of degree of oxidation, solder is infiltrated up to carbon carbon composite Micro-v oid
Length and amount increase, this makes the contact area between carbon carbon composite and metal solder increase, the face of TiC conversion zones
Product is also increasing.In addition to this, there are carbon fibers and the solder of immersion mutually to hand at the interface of carbon carbon composite and metal solder
Wrong layer, this part more easily produces small deformation compared to the smooth interface of carbon carbon composite base material, to reduce remnants
Stress, the two comprehensive aspects, can achieve the purpose that improve strength of joint.
The shearing strength test of sample is carried out in Condor150 push-and-pull test machines, and the results are shown in Figure 3, and intensity is
The average value being calculated by three samples.The mean intensity of the soldered fitting of unoxidized carbon carbon composite and metal exists
35MPa or so, as degree of oxidation increases, strength of joint is stepping up, this matches with the analysis of micro interface.800
DEG C heat preservation 5min under the conditions of aoxidize after connector mean intensity reach 55MPa, improve 57% compared to not aoxidizing.
Embodiment two：
The present embodiment is different from the first embodiment in that carbon carbon composite is changed to carbon/composite material of silicon carbide
(be purchased from Changsha Bo Yun new materials Co., Ltd, used as carbon fibre reinforced composite, carbon fiber and silicon carbide composition).Its
It is same as the specific embodiment one.
By shearing test, aoxidized under the conditions of 800 DEG C of heat preservation 5min front and back joint bending stiffness be respectively 82MPa and
135MPa, intensity improve 65%.
Specific implementation mode three：
The present embodiment is different from the first embodiment in that Nb plates are changed to TC4 plates, other and specific implementation mode one
It is identical.
By shearing test, aoxidized under the conditions of 800 DEG C of heat preservation 5min front and back joint bending stiffness be respectively 31MPa and
48MPa, intensity improve 55%.
Specific implementation mode four：
Present embodiment is changed to carbon/composite material of silicon carbide from carbon carbon composite unlike specific implementation mode three.
It is other to be the same as the specific implementation mode 3.
By shearing test, aoxidized under the conditions of 800 DEG C of heat preservation 5min front and back joint bending stiffness be respectively 88MPa and
146MPa, intensity improve 54%.
Illustrative description has been done to the present invention above, it should explanation, the case where not departing from core of the invention
Under, any simple deformation, modification or other skilled in the art can not spend the equivalent replacement of creative work equal
Fall into protection scope of the present invention.
Claims (7)
1. a kind of method improving carbon fibre reinforced composite and solder bonding metal strength of joint, which is characterized in that according to following
Step carries out：Oxidation processes are carried out to carbon fibre reinforced composite surface in 700 DEG C~800 DEG C temperature ranges, so that in carbon
Fibre periphery forms cyclic annular hole；Then by the carbon fibre reinforced composite of oxidation processes, solder and metallic plate according to Sanming City
Formula Standard is controlled, and is clamped with graphite plate, ensures to be in close contact, places it in vacuum brazing furnace and vacuumize, in stove
Pressure reaches 8~9 × 10-4After MPa, solder is elevated above for 20-25 degrees Celsius from room temperature with the heating rate of 5-10 DEG C/min
The temperature of 20-150 degrees Celsius of fusing point and heat preservation is brazed, then room temperature 20-25 is down to the rate of temperature fall of 5~10 DEG C/min
Degree Celsius.
2. a kind of method improving carbon fibre reinforced composite and solder bonding metal strength of joint according to claim 1,
It is taken the photograph it is characterized in that, being elevated above brazing filler metal fusing point 50-100 from 20-25 degrees Celsius of room temperature with the heating rate of 5-10 DEG C/min
The temperature of family name's degree simultaneously keeps the temperature 5-20min and is brazed, then with the rate of temperature fall of 5~10 DEG C/min to be down to room temperature 20-25 Celsius
Degree.
3. a kind of method improving carbon fibre reinforced composite and solder bonding metal strength of joint according to claim 1,
It is characterized in that, the time for carrying out oxidation processes to carbon fibre reinforced composite surface is 5~10min.
4. a kind of method improving carbon fibre reinforced composite and solder bonding metal strength of joint according to claim 1,
It is characterized in that, the width for forming cyclic annular hole on carbon fiber periphery is 1~2 μm.
5. carbon fibre reinforced composite oxidation processes are in improving carbon fibre reinforced composite and solder bonding metal strength of joint
Application, which is characterized in that 700 DEG C~800 DEG C temperature ranges to carbon fibre reinforced composite surface carry out oxidation processes,
So as to form cyclic annular hole on carbon fiber periphery.
6. application according to claim 5, which is characterized in that the width for forming cyclic annular hole on carbon fiber periphery is 1~2
μm。
7. application according to claim 5, which is characterized in that carry out oxidation processes to carbon fibre reinforced composite surface
Time be 5~10min.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710134324.8A CN108568577B (en) | 2017-03-08 | 2017-03-08 | Method for improving strength of carbon fiber reinforced composite material and metal brazing joint |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710134324.8A CN108568577B (en) | 2017-03-08 | 2017-03-08 | Method for improving strength of carbon fiber reinforced composite material and metal brazing joint |
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| CN108568577A true CN108568577A (en) | 2018-09-25 |
| CN108568577B CN108568577B (en) | 2020-11-03 |
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Cited By (4)
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| CN111069726A (en) * | 2018-10-19 | 2020-04-28 | 天津大学 | Carbon-carbon composite material and metal brazing connection method based on electrophoretic deposition of SiC nanowires |
| CN112548252A (en) * | 2020-11-30 | 2021-03-26 | 哈尔滨工业大学 | Method for regulating and controlling surface structure of carbon fiber reinforced composite material and metal brazing through electric corrosion |
| CN112548253A (en) * | 2020-11-30 | 2021-03-26 | 哈尔滨工业大学 | Method for brazing fiber reinforced composite material and metal in selective hot corrosion auxiliary mode |
| CN112975031A (en) * | 2021-02-05 | 2021-06-18 | 北京科技大学 | Surface honeycombed modified auxiliary brazing CfMethod for preparing/SiC composite material and metal |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111069726A (en) * | 2018-10-19 | 2020-04-28 | 天津大学 | Carbon-carbon composite material and metal brazing connection method based on electrophoretic deposition of SiC nanowires |
| CN111069726B (en) * | 2018-10-19 | 2021-04-30 | 天津大学 | Carbon-carbon composite material and metal brazing connection method based on electrophoretic deposition of SiC nanowires |
| CN112548252A (en) * | 2020-11-30 | 2021-03-26 | 哈尔滨工业大学 | Method for regulating and controlling surface structure of carbon fiber reinforced composite material and metal brazing through electric corrosion |
| CN112548253A (en) * | 2020-11-30 | 2021-03-26 | 哈尔滨工业大学 | Method for brazing fiber reinforced composite material and metal in selective hot corrosion auxiliary mode |
| CN112975031A (en) * | 2021-02-05 | 2021-06-18 | 北京科技大学 | Surface honeycombed modified auxiliary brazing CfMethod for preparing/SiC composite material and metal |
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|---|---|
| CN108568577B (en) | 2020-11-03 |
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