CN103341675B - Method for braze welding of Cf/SiC composite material and metal Nb by using Ti-Co-Nb brazing filler metal - Google Patents
Method for braze welding of Cf/SiC composite material and metal Nb by using Ti-Co-Nb brazing filler metal Download PDFInfo
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- CN103341675B CN103341675B CN201310325160.9A CN201310325160A CN103341675B CN 103341675 B CN103341675 B CN 103341675B CN 201310325160 A CN201310325160 A CN 201310325160A CN 103341675 B CN103341675 B CN 103341675B
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Abstract
The invention discloses a method for braze welding of a Cf/SiC composite material and a metal Nb by using a Ti-Co-Nb brazing filler metal. The braze welding method disclosed by the invention is mainly used for solving the current problems that a connecting brazing filler metal for the Cf/SiC composite material and the metal Nb as well as a welding joint obtained by a braze welding connection method are poor in room temperature mechanical properties and can not resist high temperature. The method comprises the steps of: 1, burnishing; 2, cleaning; 3, assembling; and 4, braze welding. The joint obtained through braze welding according to the method has better high-temperature resistance, and the element Nb is added into the brazing filler metal to inhibit the diffusion of a base metal Nb towards the middle layer of the brazing filler metal, so that a better connection is formed. The method disclosed by the invention is used for braze welding of the Cf/SiC composite material and the metal Nb.
Description
Technical field
The present invention relates to method for welding.
Background technology
C
f/ SiC ceramic matrix composite material is a kind of high temperature resistant, low-density ceramic base thermostructural composite, can meet less than 1650 DEG C long-lives, less than 2000 DEG C finite lifetime, the instructions for use in less than 2800 DEG C instantaneous life-spans.It has the excellent performance such as thermal shock resistance, high-wearing feature and hardness, resistance to chemical attack, high heat conduction, low thermal coefficient of expansion.C
f/ SiC ceramic matrix composite material absorbs energy by mechanism such as crack deflection, fibrous fracture and spike protein gene in fracture process, enhances intensity and the toughness of material, is considered to be in the high temperature resistant structure ceramics of the field such as Aero-Space and energy great potential.Due to its preparation and the restriction of manufacturing process, it is made to be difficult to directly apply to above-mentioned field.Metal niobium is a kind of high-temperature metal, good in oxidation resistance, and process based prediction model is stablized, and have the moulding of metal and toughness, machining is easy.Its these good characteristics become one of important candidate material of thermal structure part in Aeronautics and Astronautics and nuclear industry, can be used to the critical component manufacturing rocket engine, aerospace craft and nuclear reactor.If achieve C
fthe connection of/SiC and metal Nb, just can overcome the shortcomings such as its processing and forming difficulty, also can play bi-material advantage separately, its range of application can be more wide.So, realize C
fthe reliable connection of/SiC ceramic matrix composite material and metal niobium has important engineering significance.
At present, active soldering method because operating procedure is simple, the advantage such as joint dimension and shape wide adaptability becomes the prefered method being connected pottery and metal.And relevant C
fthe report of/SiC ceramic matrix composite material brazing is less, and the chemism mainly due to this composite is low, and conventional solder is difficult to its surface wetting.And comparatively conventional Ag-Cu-Ti system active solder can not meet applied at elevated temperature requirement because fusing point is low.
Summary of the invention
The present invention will solve existing C
fwelding point room-temperature mechanical property that the connection solder of/SiC ceramic matrix composite material and metal Nb and soldering connecting method obtain difference and the problem of non-refractory, and the one provided utilizes Ti-Co-Nb solder brazing C
fthe method of/SiC ceramic matrix composite material and metal Nb.
One utilizes Ti-Co-Nb solder brazing C
fthe method of/SiC ceramic matrix composite material and metal Nb, specifically carry out according to following steps:
One, by C
fmetal Nb, successively with the polishing of 200#, 400#, 600# and 800# abrasive paper for metallograph, polishes to surface-brightening with 400#, 600# and 1000# abrasive paper for metallograph by the surface to be welded of/SiC ceramic matrix composite material successively;
Two, the C after step one being polished
f/ SiC ceramic matrix composite material and metal Nb are immersed in acetone, ultrasonic cleaning 15min, then rinse with absolute ethyl alcohol, dry up;
Three, by Ti-Co-Nb solder successively with the polishing of 400#, 600# and 1000# abrasive paper for metallograph with to surface-brightening, be immersed in again in acetone, ultrasonic cleaning 10min, then rinse with absolute ethyl alcohol, dry up, then with 502 glue, Ti-Co-Nb solder is bonded at the C after step 2 process
fbetween/SiC ceramic matrix composite material and metal Nb, be assembled into C
fthe structural member of/SiC ceramic matrix composite material/Ti-Co-Nb solder/metal Nb;
Four, the structural member that step 3 obtains is put into vacuum brazing furnace, compress, being then evacuated to vacuum is 1.0 × 10
-3pa, being warming up to temperature is 300 DEG C, and temperature retention time is 8min ~ 20min; Be warming up to brazing temperature again, carry out brazing; Be cooled to 300 DEG C again, then with stove cooling, complete and utilize Ti-Co-Nb solder brazing C
fthe method of/SiC ceramic matrix composite material and metal Nb.
The invention has the beneficial effects as follows: in high-temp solder, compared to expensive Au base and Pd base solder, Ti base, Ni base and Co base solder then more have practical value.Ti is one of active element the most basic in active solder, and in order to ensure the wetability of high-temp solder, the present invention is with Ti-Co solder for base, and both atomic ratios are 1: 1.Ti-50Co(at%) as a kind of high-temp solder, its fusing point is higher, and the joint resistance to elevated temperatures that soldering obtains is better.On the other hand from the binary phase diagraml of Ti-Nb, Ti and Nb is completely solid molten, because mother metal Nb is at high temperature easily added Nb element by the excessive corrosion of solder in solder, to suppress mother metal Nb to the diffusion in solder intermediate layer, thus forms more good connection.
The present invention is used for soldering C
f/ SiC ceramic matrix composite material and metal Nb.
Accompanying drawing explanation
Fig. 1 is that in embodiment one, brazing temperature is 1320 DEG C, and the brazing time is 10min, and solder composition is Ti42.5Co42.5Nb15(at%) the electron backscattered photo of joint; Fig. 2 is the scanning electron microscope (SEM) photograph of fracture.
Detailed description of the invention
Technical solution of the present invention is not limited to following cited detailed description of the invention, also comprises any combination between each detailed description of the invention.
Detailed description of the invention one: present embodiment one utilizes Ti-Co-Nb solder brazing C
fthe method of/SiC ceramic matrix composite material and metal Nb, specifically carry out according to following steps:
One, by C
fmetal Nb, successively with the polishing of 200#, 400#, 600# and 800# abrasive paper for metallograph, polishes to surface-brightening with 400#, 600# and 1000# abrasive paper for metallograph by the surface to be welded of/SiC ceramic matrix composite material successively;
Two, the C after step one being polished
f/ SiC ceramic matrix composite material and metal Nb are immersed in acetone, ultrasonic cleaning 15min, then rinse with absolute ethyl alcohol, dry up;
Three, by Ti-Co-Nb solder successively with the polishing of 400#, 600# and 1000# abrasive paper for metallograph with to surface-brightening, be immersed in again in acetone, ultrasonic cleaning 10min, then rinse with absolute ethyl alcohol, dry up, then with 502 glue, Ti-Co-Nb solder is bonded at the C after step 2 process
fbetween/SiC ceramic matrix composite material and metal Nb, be assembled into C
fthe structural member of/SiC ceramic matrix composite material/Ti-Co-Nb solder/metal Nb;
Four, the structural member that step 3 obtains is put into vacuum brazing furnace, compress, being then evacuated to vacuum is 1.0 × 10
-3pa, being warming up to temperature is 300 DEG C, and temperature retention time is 8min ~ 20min; Be warming up to brazing temperature again, carry out brazing; Be cooled to 300 DEG C again, then with stove cooling, complete and utilize Ti-Co-Nb solder brazing C
fthe method of/SiC ceramic matrix composite material and metal Nb.
Detailed description of the invention two: present embodiment and detailed description of the invention one unlike: in step 3, the preparation method of Ti-Co-Nb solder specifically carries out according to following steps: a, press the order being above followed successively by Co block, Ti block and Nb block and be placed in crucible; B, take out crucible vacuum to 10
-1pa, then passes into high-purity argon gas, then is evacuated to 10
-1pa; C, the operation of repetition b step twice; D, with electric arc, melting is carried out 4 ~ 8 times to each metal derby, then thinly slice with wire electric discharge patterning method, then polish flat successively with 200#, 400#, 600# and 800# sand paper successively, namely complete the preparation of Ti-Co-Nb solder.Other is identical with detailed description of the invention one.
Detailed description of the invention three: present embodiment and detailed description of the invention one unlike: in step 3, Ti-Co-Nb solder is be made up of the titanium of 8.5 parts ~ 45 parts niobiums, 33 parts ~ 50 parts cobalts and 22 parts ~ 41.5 parts according to mass fraction.Other is identical with detailed description of the invention one.
Detailed description of the invention four: present embodiment and detailed description of the invention one unlike: in step 4, temperature retention time is 10min.Other is identical with detailed description of the invention one.
Detailed description of the invention five: present embodiment and detailed description of the invention one unlike: in step 4, the technological parameter of brazing is: brazing temperature is 1300 DEG C ~ 1340 DEG C, and the brazing time is 10min ~ 20min, and brazing pressure is 10
4pa.Other is identical with detailed description of the invention one.
Detailed description of the invention six: present embodiment and detailed description of the invention one unlike: when to be warming up to temperature in step 4 be 300 DEG C, controlling programming rate is 10 DEG C/min.Other is identical with detailed description of the invention one.
Detailed description of the invention seven: present embodiment and detailed description of the invention one unlike: when being warming up to brazing temperature in step 4, controlling programming rate is 5 DEG C/min.Other is identical with detailed description of the invention one.
Detailed description of the invention eight: present embodiment and detailed description of the invention one unlike: when being cooled to 300 DEG C in step 4, controlling cooling rate is 5 DEG C/min.Other is identical with detailed description of the invention one.
Following examples are adopted to verify beneficial effect of the present invention:
Embodiment one:
The present embodiment one utilizes Ti-Co-Nb solder brazing C
fthe method of/SiC ceramic matrix composite material and metal Nb, specifically carry out according to following steps:
One, by C
fmetal Nb, successively with the polishing of 200#, 400#, 600# and 800# abrasive paper for metallograph, polishes to surface-brightening with 400#, 600# and 1000# abrasive paper for metallograph by the surface to be welded of/SiC ceramic matrix composite material successively;
Two, the C after step one being polished
f/ SiC ceramic matrix composite material and metal Nb are immersed in acetone, ultrasonic cleaning 15min, then rinse with absolute ethyl alcohol, dry up;
Three, by Ti-Co-Nb solder successively with the polishing of 400#, 600# and 1000# abrasive paper for metallograph with to surface-brightening, be immersed in again in acetone, ultrasonic cleaning 10min, then rinse with absolute ethyl alcohol, dry up, then with 502 glue, Ti-Co-Nb solder is bonded at the C after step 2 process
fbetween/SiC ceramic matrix composite material and metal Nb, be assembled into C
fthe structural member of/SiC ceramic matrix composite material/Ti-Co-Nb solder/metal Nb;
Four, the structural member that step 3 obtains is put into vacuum brazing furnace, compress, being then evacuated to vacuum is 1.0 × 10
-3pa, being warming up to temperature is 300 DEG C, and temperature retention time is 10min; Be warming up to brazing temperature again, carry out brazing; Be cooled to 300 DEG C again, then with stove cooling, complete and utilize Ti-Co-Nb solder brazing C
fthe method of/SiC ceramic matrix composite material and metal Nb.
The Mechanical test results of the composition of Ti-Co-Nb solder in the present embodiment, brazing temperature, brazing time and soldered fitting is as shown in the table:
In the present embodiment, brazing temperature is 1320 DEG C, and the brazing time is 10min, and solder composition is Ti42.5Co42.5Nb15(at%) the electron backscattered photo of joint as shown in Figure 1, the scanning electron microscope (SEM) photograph of fracture is as shown in Figure 2.
Experimental result shows, adopts Ti-Co-Nb solder of the present invention to C
f/ SiC ceramic matrix composite material all achieves with metal Nb and is successfully connected, when being incubated 20min under the brazing temperature condition at 1300 DEG C, when solder composition is Ti42.5Co42.5Nb15 (at.%), obtain the highest bonding strength 192MPa, and under the brazing conditions of 1320 DEG C of insulation 10min: when solder composition is Ti42.5Co42.5Nb15, the gentle 600 DEG C of shearing strengths in its junction chamber are respectively 187MPa and 221.8MPa; When solder composition is Ti35Co35Nb30, the gentle 600 DEG C of shearing strengths in its junction chamber are respectively 161.4MPa and 170.7MPa, and its shear strength at 600 DEG C increases than during room temperature; And with after above-mentioned two kinds of solder brazings, at 800 DEG C, doing compression shear test, mother metal Nb first surrenders then joint breaking, it can thus be appreciated that the yield strength of joint bending stiffness > mother metal Nb (800 DEG C of yield strengths are about 100MPa).
Claims (8)
1. one kind utilizes Ti-Co-Nb solder brazing C
fthe method of/SiC ceramic matrix composite material and metal Nb, is characterized in that the method, specifically carries out according to following steps:
One, by C
fmetal Nb, successively with the polishing of 200#, 400#, 600# and 800# abrasive paper for metallograph, polishes to surface-brightening with 400#, 600# and 1000# abrasive paper for metallograph by the surface to be welded of/SiC ceramic matrix composite material successively;
Two, the C after step one being polished
f/ SiC ceramic matrix composite material and metal Nb are immersed in acetone, ultrasonic cleaning 15min, then rinse with absolute ethyl alcohol, dry up;
Three, Ti-Co-Nb solder is polished to surface-brightening with 400#, 600# and 1000# abrasive paper for metallograph successively, be immersed in again in acetone, ultrasonic cleaning 10min, then rinse with absolute ethyl alcohol, dry up, then with 502 glue, Ti-Co-Nb solder is bonded at the C after step 2 process
fbetween/SiC ceramic matrix composite material and metal Nb, be assembled into C
fthe structural member of/SiC ceramic matrix composite material/Ti-Co-Nb solder/metal Nb;
Four, the structural member that step 3 obtains is put into vacuum brazing furnace, compress, being then evacuated to vacuum is 1.0 × 10
-3pa, being warming up to temperature is 300 DEG C, and temperature retention time is 8min ~ 20min; Be warming up to brazing temperature again, carry out brazing; Be cooled to 300 DEG C again, then with stove cooling, complete and utilize Ti-Co-Nb solder brazing C
fthe method of/SiC ceramic matrix composite material and metal Nb.
2. one according to claim 1 utilizes Ti-Co-Nb solder brazing C
fthe method of/SiC ceramic matrix composite material and metal Nb, is characterized in that what the preparation method of Ti-Co-Nb solder in step 3 specifically carried out according to following steps: a, press the order being above followed successively by Co block, Ti block and Nb block and be placed in crucible; B, take out crucible vacuum to 10
-1pa, then passes into high-purity argon gas, then is evacuated to 10
-1pa; C, the operation of repetition b step twice; D, with electric arc, melting is carried out 4 ~ 8 times to each metal derby, then thinly slice with wire electric discharge patterning method, then polish flat successively with 200#, 400#, 600# and 800# sand paper successively, namely complete the preparation of Ti-Co-Nb solder.
3. one according to claim 1 utilizes Ti-Co-Nb solder brazing C
fthe method of/SiC ceramic matrix composite material and metal Nb, is characterized in that Ti-Co-Nb solder in step 3 is be made up of the titanium of 8.5 parts ~ 45 parts niobiums, 33 parts ~ 50 parts cobalts and 22 parts ~ 41.5 parts according to mass fraction.
4. one according to claim 1 utilizes Ti-Co-Nb solder brazing C
fthe method of/SiC ceramic matrix composite material and metal Nb, is characterized in that in step 4, temperature retention time is 10min.
5. one according to claim 1 utilizes Ti-Co-Nb solder brazing C
fthe method of/SiC ceramic matrix composite material and metal Nb, is characterized in that the technological parameter of brazing in step 4 is: brazing temperature is 1300 DEG C ~ 1340 DEG C, and the brazing time is 10min ~ 20min, and brazing pressure is 10
4pa.
6. one according to claim 1 utilizes Ti-Co-Nb solder brazing C
fthe method of/SiC ceramic matrix composite material and metal Nb, when it is characterized in that being warming up to temperature in step 4 is 300 DEG C, controlling programming rate is 10 DEG C/min.
7. one according to claim 1 utilizes Ti-Co-Nb solder brazing C
fthe method of/SiC ceramic matrix composite material and metal Nb, when it is characterized in that being warming up to brazing temperature in step 4, controlling programming rate is 5 DEG C/min.
8. one according to claim 1 utilizes Ti-Co-Nb solder brazing C
fthe method of/SiC ceramic matrix composite material and metal Nb, when it is characterized in that being cooled to 300 DEG C in step 4, controlling cooling rate is 5 DEG C/min.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310325160.9A CN103341675B (en) | 2013-07-30 | 2013-07-30 | Method for braze welding of Cf/SiC composite material and metal Nb by using Ti-Co-Nb brazing filler metal |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310325160.9A CN103341675B (en) | 2013-07-30 | 2013-07-30 | Method for braze welding of Cf/SiC composite material and metal Nb by using Ti-Co-Nb brazing filler metal |
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| CN103341675B true CN103341675B (en) | 2015-05-20 |
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|---|---|---|---|---|
| CN105750676B (en) * | 2015-12-30 | 2018-07-03 | 浙江工业大学 | A kind of method using goldleaf soldering connection graphite and Hastelloy N alloys |
| CN106001826B (en) * | 2016-07-08 | 2018-02-27 | 浙江工业大学 | The method that one kind prepares high strength graphite/Hastelloy N alloy-junctions |
| CN108381057A (en) * | 2018-01-22 | 2018-08-10 | 北京科技大学 | A kind of preparation and method for welding for being brazed the CoTiNb solders of Nb-Ti high temperature alloys |
| CN109369208B (en) * | 2018-10-31 | 2021-07-09 | 广东工业大学 | Brazing filler metal for silicon carbide connection and preparation method and application thereof |
| CN110026634B (en) * | 2019-05-13 | 2021-01-29 | 哈尔滨工业大学 | Method for brazing carbon fiber reinforced carbon-based composite material by using Si-Zr high-temperature brazing filler metal |
| CN113478122B (en) * | 2021-07-07 | 2023-01-31 | 临沂大学 | Ultrahigh-temperature brazing filler metal for connecting C/SiC composite material and niobium alloy, preparation process thereof and vacuum active brazing method |
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