A cobalt-based adhesive tape filler and a method for preparing the same

Abstract

The application discloses a cobalt-based adhesive brazing filler metal, which is composed of cobalt-based alloy brazing filler metal powder 90-93% by mass fraction and an adhesive, and the adhesive is composed of the following components: polyacrylic acid ethyl ester 1-2%, ethyl cellulose 0.5-1%, tributyl phosphate 1.5-2%, diisobutyl phthalate 3-4%, fatty acid amide 0.5-1% and anti-aging agent 0.5-1%. In addition, the application further provides a preparation method of the cobalt-based adhesive brazing filler metal, which comprises the following steps: 1, cobalt-based alloy brazing filler metal powder preparation; 2, adhesive preparation; and 3, adhesive preparation. The cobalt-based alloy brazing filler metal powder is adhered and formed by the adhesive, and the cobalt-based adhesive brazing filler metal has adhesion, so that the cobalt-based adhesive brazing filler metal and a workpiece to be welded are adhered and not fallen off, uniformity can be ensured during brazing, the welds are consistent, and good brazing effect is achieved. In addition, by controlling the components of the adhesive, the cobalt-based adhesive brazing filler metal has the characteristics of low carbon residue, low oxidation, low delamination and long shelf life.

Description

Technical Field

[0001] This invention belongs to the field of brazing materials technology, specifically relating to a cobalt-based adhesive tape brazing filler metal and its preparation method. Background Technology

[0002] Adhesive-backed brazing filler metal is a special type of brazing filler metal with flexibility and a certain degree of adhesion, and it is a further derivative product of solder paste. Adhesive-backed brazing filler metal is mainly used in high-tech defense fields such as brazing of special metal structures (e.g., honeycomb structures), brazing and repair of aircraft blades, brazing of special metals in aerospace, and special wear-resistant coating materials. The cobalt-based brazing filler metal involved in this invention is mainly used for welding high-temperature alloy materials for aerospace engines. Engines have complex structures and many irregular welding surfaces. Common brazing filler metals are mostly used in the form of powder, wire, rod, or sheet, which presents problems such as assembly difficulties, difficulty in fixing during welding, and uneven powder thickness when welding irregular surfaces. Adhesive-backed brazing filler metal can be cut and stamped into any shape, has a certain viscosity, can be adhered to the surface to be welded, and has the characteristics of convenient use and precise dosage. Summary of the Invention

[0003] The technical problem to be solved by this invention is to address the shortcomings of the prior art by providing a cobalt-based adhesive tape brazing filler metal. This cobalt-based adhesive tape brazing filler metal uses an adhesive to bond powdered cobalt-based alloy brazing filler metal into a cobalt-based adhesive tape, which has a certain degree of adhesion, ensuring that the cobalt-based adhesive tape brazing filler metal adheres firmly to the workpiece to be brazed and does not detach. During brazing, it ensures uniformity and consistent weld seams, achieving good brazing results. Furthermore, by controlling the composition of the adhesive, it features low carbon residue, resistance to oxidation, resistance to delamination, and a long shelf life.

[0004] To solve the above-mentioned technical problems, the present invention adopts a cobalt-based adhesive tape solder, characterized in that the cobalt-based adhesive tape solder is composed of 90% to 93% cobalt-based alloy solder powder by mass fraction, with the balance being an adhesive, wherein the adhesive is composed of the following components: 1% to 2% polyethyl acrylate, 0.5% to 1% ethyl cellulose, 1.5% to 2% tributyl phosphate, 3% to 4% diisobutyl phthalate, 0.5% to 1% fatty acid amide, and 0.5% to 1% antioxidant.

[0005] This invention uses an adhesive to bond powdered cobalt-based alloy brazing filler metal into a cobalt-based adhesive tape, which has a certain degree of adhesion, ensuring that the cobalt-based adhesive tape adheres to the workpiece to be brazed and does not fall off. During brazing, it ensures uniformity and consistent weld seams, achieving good brazing results. Furthermore, by controlling the composition of the adhesive, it features low carbon residue, resistance to oxidation, resistance to delamination, and a long shelf life. In the adhesive of this invention, polyethyl acrylate is used as an adhesive with low harm to the human body, ethyl cellulose is used as a water-retaining agent and stabilizer, tributyl phosphate is used as a solvent, diisobutyl phthalate is used as a plasticizer, fatty acid amide is used as a thixotropic agent to prevent flow, and an anti-aging agent provides antioxidant effects.

[0006] The aforementioned cobalt-based adhesive solder is characterized in that the cobalt-based alloy solder powder is composed of HBCo51CrNiSiW, wherein the mass fraction of each element in HBCo51CrNiSiW is Cr 18%–20%, Ni 16%–18%, Si 7.5%–8.5%, W 3.5%–4.5%, B 0.7%–0.9%, C 0.35%–0.45%, S≤0.02%, P≤0.02%, Al≤0.05%, Ti≤0.05%, Zr≤0.05%, Se≤0.005%, O≤0.05%, Fe≤1.0%, with the balance being Co and unavoidable impurities.

[0007] In addition, the present invention provides a method for preparing cobalt-based adhesive tape solder, characterized in that the method includes the following steps:

[0008] Step 1: Preparation of cobalt-based alloy brazing powder:

[0009] Cobalt-based alloy raw materials are vacuum induction melted and atomized into powder, then sieved, and the sieved powders are mixed to obtain cobalt-based alloy brazing filler powder.

[0010] Step 2: Adhesive preparation:

[0011] Ethyl polyacrylate is dissolved in ethyl acetate, and then added to a double planetary mixer along with ethyl cellulose, tributyl phosphate, diisobutyl phthalate, fatty acid amide and antioxidant. The mixture is then stirred thoroughly at a speed of 15 r / min to 80 r / min for 180 min to 240 min. The material container of the mixer is then heated using an oil temperature controller, and the temperature is controlled at 40℃ to 70℃. The mixture is then stirred for another 30 min to 90 min to obtain the adhesive.

[0012] Step 3: Adhesive tape preparation:

[0013] The cobalt-based alloy brazing powder obtained in step one and the adhesive obtained in step two are mixed and stirred evenly, and then rolled repeatedly into strips using a twin-roll mill to obtain cobalt-based adhesive brazing tape. The cobalt-based adhesive brazing tape is then cut, coated with single-sided silicone release paper, and coiled and packaged.

[0014] This invention involves vacuum induction melting and atomization of cobalt-based alloy raw materials to form small powder particles, which are then sieved to obtain cobalt-based alloy solder powder. Ethyl polyacrylate is dissolved in ethyl acetate and then stirred together with ethyl cellulose, tributyl phosphate, diisobutyl phthalate, fatty acid amide, and an antioxidant. The ethyl acetate solvent is then removed by stirring under heating conditions to obtain an adhesive. Finally, the cobalt-based alloy solder powder and adhesive are mixed and rolled to obtain cobalt-based adhesive tape solder. The cobalt-based adhesive tape solder is then cut to appropriate lengths, coated with single-sided silicone release paper to prevent adhesion, and coiled and packaged to obtain the cobalt-based adhesive tape solder product.

[0015] The above method is characterized in that, in step one, the mass fraction of the cobalt-based alloy brazing powder is 10%–20% for -100-200 mesh powder, 60%–80% for -200-300 mesh powder, and 10%–20% for -300 mesh powder. This invention uses a combination of cobalt-based alloy brazing powders of different fineness because coarse powder is less prone to oxidation and has high strength, but its large particle size creates gaps between spherical particles. Using a certain amount of fine powder can better fill these gaps, making the brazing filler more compact and resulting in better brazing performance.

[0016] The above method is characterized in that the vacuum degree in the vacuum induction melting and atomization powdering process in step one is higher than 1×10⁻⁶. -1 Pa, the atomizing gas is Ar, and the atomization pressure is 2MPa to 4MPa. This invention controls the conditions of vacuum induction melting atomization powder preparation to form uniform cobalt-based alloy solder powder from cobalt-based alloy raw materials.

[0017] The method described above is characterized in that the thickness of the cobalt-based adhesive tape solder in step three is 0.2mm to 2mm, and the width is 50mm to 150mm. This invention achieves optimal performance by controlling the dimensions of the cobalt-based adhesive tape solder, avoiding the difficulties in processing due to its thinness or narrowness, the inability to guarantee the strength of the adhesive tape due to its width, and the excessive brazing weld size (exceeding 2mm) resulting in poor brazing performance.

[0018] The above method is characterized in that, in step three, the cobalt-based adhesive brazing tape is cut into any shape suitable for the brazing workpiece and adhered to the surface of the workpiece to be brazed. This invention, by cutting the cobalt-based adhesive brazing tape into any shape suitable for the brazing workpiece, adhering it to the surface of the workpiece to be brazed, and then performing brazing, is easy to assemble and convenient to use, unaffected by the shape of the welding surface, and allows for precise dosage.

[0019] The present invention has the following advantages compared with the prior art.

[0020] 1. This invention uses an adhesive to bond powdered cobalt-based alloy brazing filler metal into a cobalt-based adhesive tape brazing filler metal. The tape has a certain degree of adhesion, which ensures that the cobalt-based adhesive brazing filler metal adheres to the workpiece to be welded and does not fall off. During brazing, it can ensure uniformity and consistent weld seam, achieving a good brazing effect. Furthermore, by controlling the composition of the adhesive, it has the characteristics of low carbon residue, not easy to oxidize, not easy to delaminate, and long shelf life.

[0021] 2. In this invention, cobalt-based alloy raw materials are vacuum induction melted and atomized to form small powder particles, which are then sieved to obtain cobalt-based alloy solder powder. Polyethyl acrylate is dissolved in ethyl acetate and then stirred together with ethyl cellulose, tributyl phosphate, diisobutyl phthalate, fatty acid amide, and antioxidant. The ethyl acetate solvent is then removed by stirring under heating conditions to obtain an adhesive. Finally, the cobalt-based alloy solder powder and adhesive are mixed and rolled to obtain cobalt-based adhesive tape solder. The cobalt-based adhesive tape solder is then cut into appropriate lengths, covered with single-sided silicone release paper to prevent them from sticking together, and coiled and packaged to obtain the cobalt-based adhesive tape solder product.

[0022] 3. The present invention uses cobalt-based alloy brazing powders of different coarse and fine textures in combination because coarse powder is not easily oxidized and has high strength, but coarse powder particles are large and there will be gaps between the spherical particles. Using a certain amount of fine powder can better fill the gaps between the coarse powders, making the brazing material denser and the brazing effect better.

[0023] 4. This invention involves cutting cobalt-based adhesive brazing tape into any shape suitable for brazing the workpiece, attaching it to the surface of the workpiece to be brazed, and then performing brazing. It is suitable for vacuum brazing of cobalt-based, nickel-based high-temperature alloys, non-ferrous metals, etc. It is easy to assemble, convenient to use, unaffected by the shape of the welding surface, precise in dosage, has excellent brazing performance, low carbon residue, is not easy to delaminate, and has a long shelf life.

[0024] The technical solution of the present invention will be further described in detail below through embodiments. Detailed Implementation

[0025] Example 1

[0026] This embodiment includes the following steps:

[0027] Step 1: Preparation of cobalt-based alloy brazing powder:

[0028] Cobalt-based alloy raw materials are subjected to a vacuum degree higher than 1×10 -1The atomizing gas is Ar, and the atomization pressure is 2.8 MPa. Vacuum induction melting and atomization are carried out to produce powder, which is then sieved. The sieved powders are then mixed to obtain cobalt-based alloy brazing filler powder. The cobalt-based alloy brazing filler powder contains 10% -100 mesh to -200 mesh powder, 80% -200 mesh to -300 mesh powder, and 10% -300 mesh powder.

[0029] Step 2: Adhesive preparation:

[0030] Ethyl polyacrylate was dissolved in ethyl acetate, and then added to a double planetary mixer along with ethyl cellulose, tributyl phosphate, diisobutyl phthalate, fatty acid amide and antioxidant. The mixture was then stirred thoroughly at 50 r / min for 240 min. The material container of the mixer was then heated with an oil temperature controller to 45°C and stirred for another 90 min to obtain the adhesive.

[0031] Step 3: Adhesive tape preparation:

[0032] The cobalt-based alloy brazing powder obtained in step one and the adhesive obtained in step two are mixed and stirred evenly at a mass ratio of 90:10. Then, the mixture is repeatedly rolled into a strip with a thickness of 0.2 mm and a width of 50 mm using a twin-roll mill to obtain cobalt-based adhesive brazing tape. The cobalt-based adhesive brazing tape is then cut into 5 mm wide strips, coated with single-sided silicone release paper, and then coiled and packaged.

[0033] Upon testing, the cobalt-based adhesive solder prepared in this embodiment is composed of the following components by mass fraction: 90% cobalt-based alloy solder powder, with the remainder being adhesive. The adhesive comprises: 2% ethyl polyacrylate, 1% ethyl cellulose, 2% tributyl phosphate, 4% diisobutyl phthalate, 0.5% fatty acid amide, and 0.5% antioxidant. The cobalt-based alloy solder powder is HBCo51CrNiSiW, and the mass fractions of each element in HBCo51CrNiSiW are: Cr 18.62%, Ni 16.90%, Si 7.88%, W 3.94%, B 0.88%, C 0.41%, S≤0.02%, P≤0.02%, Al≤0.05%, Ti≤0.05%, Zr≤0.05%, Se≤0.005%, O≤0.05%, Fe≤1.0%, with the remainder being Co and unavoidable impurities.

[0034] The cobalt-based adhesive tape solder packaged in coils in this embodiment is cut into a shape suitable for GH4169 alloy and adhered to the surface of the GH4169 alloy to be brazed. The process is carried out under a vacuum of 8×10⁻⁶. -3Vacuum brazing was performed at a brazing temperature of 1180℃ and a holding time of 10 minutes to obtain the brazed material. Testing showed that the weld zone of the brazed material had good bonding with the base material, the joint structure was uniform, and there were no defects such as slag inclusions or cracks. A distinct diffusion layer structure was observed, with Si, W, and Co elements in the brazing filler metal diffusing into the base material, and Nb and Mo elements in the base material diffusing into the weld. The weld achieved metallurgical bonding, and the brazing effect was excellent.

[0035] Example 2

[0036] This embodiment includes the following steps:

[0037] Step 1: Preparation of cobalt-based alloy brazing powder:

[0038] Cobalt-based alloy raw materials are subjected to a vacuum degree higher than 1×10 -1 The atomizing gas is Ar, and the atomization pressure is 3.5 MPa. Vacuum induction melting and atomization are carried out to produce powder, which is then sieved. The sieved powders are then mixed to obtain cobalt-based alloy brazing filler powder. The cobalt-based alloy brazing filler powder contains 12% by mass of -100 mesh to -200 mesh powder, 76% by mass of -200 mesh to -300 mesh powder, and 12% by mass of -300 mesh powder.

[0039] Step 2: Adhesive preparation:

[0040] Ethyl polyacrylate was dissolved in ethyl acetate and then added to a double planetary mixer along with ethyl cellulose, tributyl phosphate, diisobutyl phthalate, fatty acid amide and antioxidant. The mixture was then stirred thoroughly at 55 r / min for 180 min. The material container of the mixer was then heated with an oil temperature controller to 60°C and stirred for another 50 min to obtain the adhesive.

[0041] Step 3: Adhesive tape preparation:

[0042] The cobalt-based alloy brazing powder obtained in step one and the adhesive obtained in step two are mixed and stirred evenly at a mass ratio of 91:9. Then, the mixture is repeatedly rolled into a strip with a thickness of 0.4 mm and a width of 80 mm using a twin-roll mill to obtain cobalt-based adhesive brazing tape. The cobalt-based adhesive brazing tape is then cut into 10 mm pieces, coated with single-sided silicone release paper, and packaged in coils.

[0043] Upon testing, the cobalt-based adhesive solder prepared in this embodiment is composed of the following components by mass fraction: 91% cobalt-based alloy solder powder, with the remainder being adhesive. The adhesive comprises: 1.5% ethyl polyacrylate, 1% ethyl cellulose, 1.5% tributyl phosphate, 4% diisobutyl phthalate, 0.5% fatty acid amide, and 0.5% antioxidant. The cobalt-based alloy solder powder is HBCo51CrNiSiW, with the following mass fractions of elements: Cr 18.62%, Ni 16.90%, Si 7.88%, W 3.94%, B 0.88%, C 0.41%, S≤0.02%, P≤0.02%, Al≤0.05%, Ti≤0.05%, Zr≤0.05%, Se≤0.005%, O≤0.05%, Fe≤1.0%, with the remainder being Co and unavoidable impurities.

[0044] The cobalt-based adhesive tape solder packaged in coils in this embodiment is cut into a shape suitable for GH4169 alloy and adhered to the surface of the GH4169 alloy to be brazed. The process is carried out under a vacuum of 8×10⁻⁶. -3 Vacuum brazing was performed at a brazing temperature of 1180℃ and a holding time of 10 minutes to obtain the brazed material. Testing showed that the weld zone of the brazed material had good bonding with the base material, the joint structure was uniform, and there were no defects such as slag inclusions or cracks. A distinct diffusion layer structure was observed, with Si, W, and Co elements in the brazing filler metal diffusing into the base material, and Nb and Mo elements in the base material diffusing into the weld. The weld achieved metallurgical bonding, and the brazing effect was excellent.

[0045] Example 3

[0046] This embodiment includes the following steps:

[0047] Step 1: Preparation of cobalt-based alloy brazing powder:

[0048] Cobalt-based alloy raw materials are subjected to a vacuum degree higher than 1×10⁻⁶. -1 The atomizing gas is Ar, and the atomization pressure is 4 MPa. Vacuum induction melting and atomization are carried out to produce powder, which is then sieved. The sieved powders are then mixed to obtain cobalt-based alloy brazing filler powder. The cobalt-based alloy brazing filler powder contains 15% of the powder with a mass fraction of -100 mesh to -200 mesh, 70% of the powder with a mass fraction of -200 mesh to -300 mesh, and 15% of the powder with a mass fraction of -300 mesh.

[0049] Step 2: Adhesive preparation:

[0050] Ethyl polyacrylate was dissolved in ethyl acetate and then added to a double planetary mixer along with ethyl cellulose, tributyl phosphate, diisobutyl phthalate, fatty acid amide and antioxidant. The mixture was then stirred at 60 r / min for 200 min. The material container of the mixer was then heated with an oil temperature controller to 70°C and stirred for another 30 min to obtain the adhesive.

[0051] Step 3: Adhesive tape preparation:

[0052] The cobalt-based alloy brazing powder obtained in step one and the adhesive obtained in step two are mixed and stirred evenly at a mass ratio of 93:7. Then, the mixture is repeatedly rolled into a strip with a thickness of 0.8 mm and a width of 100 mm using a twin-roll mill to obtain cobalt-based adhesive brazing tape. The cobalt-based adhesive brazing tape is then cut into 15 mm wide strips, coated with single-sided silicone release paper, and then coiled and packaged.

[0053] Upon testing, the cobalt-based adhesive solder prepared in this embodiment is composed of the following components by mass fraction: 93% cobalt-based alloy solder powder, with the remainder being adhesive. The adhesive comprises: 1% ethyl polyacrylate, 0.5% ethyl cellulose, 1.5% tributyl phosphate, 3% diisobutyl phthalate, 0.5% fatty acid amide, and 0.5% antioxidant. The cobalt-based alloy solder powder is HBCo51CrNiSiW, with the following mass fractions of elements: Cr 18.62%, Ni 16.90%, Si 7.88%, W 3.94%, B 0.88%, C 0.41%, S≤0.02%, P≤0.02%, Al≤0.05%, Ti≤0.05%, Zr≤0.05%, Se≤0.005%, O≤0.05%, Fe≤1.0%, with the remainder being Co and unavoidable impurities.

[0054] The cobalt-based adhesive tape solder packaged in coils in this embodiment is cut into a shape suitable for GH4169 alloy and adhered to the surface of the GH4169 alloy to be brazed. The process is carried out under a vacuum of 8×10⁻⁶. -3 Vacuum brazing was performed at a brazing temperature of 1180℃ and a holding time of 10 minutes to obtain the brazed material. Testing showed that the weld zone of the brazed material had good bonding with the base material, the joint structure was uniform, and there were no defects such as slag inclusions or cracks. A distinct diffusion layer structure was observed, with Si, W, and Co elements in the brazing filler metal diffusing into the base material, and Nb and Mo elements in the base material diffusing into the weld. The weld achieved metallurgical bonding, and the brazing effect was excellent.

[0055] Example 4

[0056] This embodiment includes the following steps:

[0057] Step 1: Preparation of cobalt-based alloy brazing powder:

[0058] Cobalt-based alloy raw materials are subjected to a vacuum degree higher than 1×10 -1 The atomizing gas is Ar, and the atomizing pressure is 2 MPa. Vacuum induction melting and atomization are carried out to produce powder, which is then sieved. The sieved powders are then mixed to obtain cobalt-based alloy brazing filler powder. The cobalt-based alloy brazing filler powder contains 20% by mass of -100 mesh to -200 mesh powder, 60% by mass of -200 mesh to -300 mesh powder, and 20% by mass of -300 mesh powder.

[0059] Step 2: Adhesive preparation:

[0060] Ethyl polyacrylate was dissolved in ethyl acetate and then added to a double planetary mixer along with ethyl cellulose, tributyl phosphate, diisobutyl phthalate, fatty acid amide and antioxidant. The mixture was then stirred thoroughly at 15 r / min for 220 min. The material container of the mixer was then heated with an oil temperature controller and stirred at 40°C for another 80 min to obtain the adhesive.

[0061] Step 3: Adhesive tape preparation:

[0062] The cobalt-based alloy brazing powder obtained in step one and the adhesive obtained in step two are mixed and stirred evenly at a mass ratio of 92:8. Then, the mixture is repeatedly rolled into a strip with a thickness of 1.0 mm and a width of 100 mm using a twin-roll mill to obtain cobalt-based adhesive brazing tape. The cobalt-based adhesive brazing tape is then cut into 20 mm pieces, coated with single-sided silicone release paper, and packaged in coils.

[0063] Upon testing, the cobalt-based adhesive solder prepared in this embodiment is composed of the following components by mass fraction: 92% cobalt-based alloy solder powder, with the remainder being adhesive. The adhesive consists of the following components: 1% ethyl polyacrylate, 0.5% ethyl cellulose, 1.0% tributyl phosphate, 3.5% diisobutyl phthalate, 1.0% fatty acid amide, and 1.0% antioxidant. The cobalt-based alloy solder powder is HBCo51CrNiSiW, and the mass fractions of each element in HBCo51CrNiSiW are: Cr 18.02%, Ni 17.98%, Si 7.51%, W 4.53%, B 0.72%, C 0.35%, S≤0.02%, P≤0.02%, Al≤0.05%, Ti≤0.05%, Zr≤0.05%, Se≤0.005%, O≤0.05%, Fe≤1.0%, with the remainder being Co and unavoidable impurities.

[0064] The cobalt-based adhesive tape solder packaged in coils in this embodiment is cut into a shape suitable for GH4169 alloy and adhered to the surface of the GH4169 alloy to be brazed. The process is carried out under a vacuum of 8×10⁻⁶. -3Vacuum brazing was performed at a brazing temperature of 1180℃ and a holding time of 10 minutes to obtain the brazed material. Testing showed that the weld zone of the brazed material had good bonding with the base material, the joint structure was uniform, and there were no defects such as slag inclusions or cracks. A distinct diffusion layer structure was observed, with Si, W, and Co elements in the brazing filler metal diffusing into the base material, and Nb and Mo elements in the base material diffusing into the weld. The weld achieved metallurgical bonding, and the brazing effect was excellent.

[0065] Example 5

[0066] This embodiment includes the following steps:

[0067] Step 1: Preparation of cobalt-based alloy brazing powder:

[0068] Cobalt-based alloy raw materials are subjected to a vacuum degree higher than 1×10 -1 The atomizing gas is Ar, and the atomization pressure is 2.5 MPa. Vacuum induction melting and atomization are carried out to produce powder, which is then sieved. The sieved powders are then mixed to obtain cobalt-based alloy brazing filler powder. The cobalt-based alloy brazing filler powder contains 15% of the powder with a mass fraction of -100 mesh to -200 mesh, 70% of the powder with a mass fraction of -200 mesh to -300 mesh, and 15% of the powder with a mass fraction of -300 mesh.

[0069] Step 2: Adhesive preparation:

[0070] Ethyl polyacrylate was dissolved in ethyl acetate and then added to a double planetary mixer along with ethyl cellulose, tributyl phosphate, diisobutyl phthalate, fatty acid amide and antioxidant. The mixture was then stirred thoroughly at 80 r / min for 210 min. The material container of the mixer was then heated with an oil temperature controller and stirred at 50°C for another 60 min to obtain the adhesive.

[0071] Step 3: Adhesive tape preparation:

[0072] The cobalt-based alloy brazing powder obtained in step one and the adhesive obtained in step two are mixed and stirred evenly at a mass ratio of 91.5:8.5. Then, the mixture is repeatedly rolled into a strip with a thickness of 2.0 mm and a width of 150 mm using a twin-roll mill to obtain cobalt-based adhesive brazing tape. The cobalt-based adhesive brazing tape is then cut into 50 mm pieces, coated with single-sided silicone release paper, and coiled and packaged.

[0073] Upon testing, the cobalt-based adhesive solder prepared in this embodiment is composed of the following components by mass fraction: 91.5% cobalt-based alloy solder powder, with the remainder being adhesive. The adhesive comprises: 1.2% ethyl polyacrylate, 0.7% ethyl cellulose, 1.6% tributyl phosphate, 3.5% diisobutyl phthalate, 0.7% fatty acid amide, and 0.8% antioxidant. The cobalt-based alloy solder powder is HBCo51CrNiSiW, with the following mass fractions of elements: Cr 19.98%, Ni 16.03%, Si 8.49%, W 3.52%, B 0.91%, C 0.45%, S≤0.02%, P≤0.02%, Al≤0.05%, Ti≤0.05%, Zr≤0.05%, Se≤0.005%, O≤0.05%, Fe≤1.0%, with the remainder being Co and unavoidable impurities.

[0074] The cobalt-based adhesive tape solder packaged in coils in this embodiment is cut into a shape suitable for GH4169 alloy and adhered to the surface of the GH4169 alloy to be brazed. The process is carried out under a vacuum of 8×10⁻⁶. -3 Vacuum brazing was performed at a brazing temperature of 1180℃ and a holding time of 10 minutes to obtain the brazed material. Testing showed that the weld zone of the brazed material had good bonding with the base material, the joint structure was uniform, and there were no defects such as slag inclusions or cracks. A distinct diffusion layer structure was observed, with Si, W, and Co elements in the brazing filler metal diffusing into the base material, and Nb and Mo elements in the base material diffusing into the weld. The weld achieved metallurgical bonding, and the brazing effect was excellent.

[0075] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention in any way. Any simple modifications, alterations, and equivalent changes made to the above embodiments based on the technical essence of the present invention shall still fall within the protection scope of the present invention.

Claims

1. A cobalt-based adhesive solder, characterized in that, This cobalt-based adhesive solder consists of 90%–93% cobalt-based alloy solder powder and the remainder being an adhesive. The adhesive comprises: 1%–2% ethyl polyacrylate, 0.5%–1% ethyl cellulose, 1.5%–2% tributyl phosphate, 3%–4% diisobutyl phthalate, 0.5%–1% fatty acid amide, and 0.5%–1% antioxidant. The cobalt-based alloy solder powder is HBCo51CrNiSiW, and the mass fractions of each element in HBCo51CrNiSiW are: Cr 18%–20%, Ni 16%–18%, Si 7.5%–8.5%, W 3.5%–4.5%, B 0.7%–0.9%, and C. The cobalt-based alloy brazing filler metal powder contains 0.35%~0.45%, S≤0.02%, P≤0.02%, Al≤0.05%, Ti≤0.05%, Zr≤0.05%, Se≤0.005%, O≤0.05%, Fe≤1.0%, with the balance being Co and unavoidable impurities; the cobalt-based alloy brazing filler metal powder contains 10%~20% of the -100 mesh to -200 mesh powder, 60%~80% of the -200 mesh to -300 mesh powder, and 10%~20% of the -300 mesh powder.

2. A method for preparing the cobalt-based adhesive tape solder as described in claim 1, characterized in that, The method includes the following steps: Step 1: Preparation of cobalt-based alloy brazing powder: Cobalt-based alloy raw materials are vacuum induction melted and atomized into powder, then sieved, and the sieved powders are mixed to obtain cobalt-based alloy brazing filler powder. Step 2: Adhesive preparation: Ethyl polyacrylate is dissolved in ethyl acetate, and then added to a double planetary mixer along with ethyl cellulose, tributyl phosphate, diisobutyl phthalate, fatty acid amide and antioxidant. The mixture is then stirred thoroughly at a speed of 15 r / min to 80 r / min for 180 min to 240 min. The material container of the mixer is then heated using an oil temperature controller, and the temperature is controlled at 40℃ to 70℃. The mixture is then stirred for another 30 min to 90 min to obtain the adhesive. Step 3: Adhesive tape preparation: The cobalt-based alloy brazing powder obtained in step one and the adhesive obtained in step two are mixed and stirred evenly, and then rolled repeatedly into strips using a twin-roll mill to obtain cobalt-based adhesive brazing tape. The cobalt-based adhesive brazing tape is then cut, coated with single-sided silicone release paper, and coiled and packaged.

3. The method according to claim 2, characterized in that, In step one, the vacuum degree in the vacuum induction melting and atomization powder production is higher than 1×10⁻⁶. -1 Pa, the atomizing gas is Ar gas, and the atomization pressure is 2MPa~4MPa.

4. The method according to claim 2, characterized in that, The cobalt-based adhesive solder mentioned in step three has a thickness of 0.2mm to 2mm and a width of 50mm to 150mm.

5. The method according to claim 2, characterized in that, In step three, the cobalt-based adhesive brazing tape is cut into any shape suitable for the brazing workpiece and then attached to the surface of the workpiece to be brazed.