A method for indirect brazing of Y2O3-MgO ceramics and titanium alloys

Abstract

A Y2O3-MgO ceramic and titanium alloy indirect brazing method relates to a Y2O3-MgO ceramic and titanium alloy brazing method. In order to solve the problem of poor interface bonding between Y2O3-MgO ceramic and metal materials, the present invention first prepares an Ag-CuO cladding layer on the surface of Y2O3-MgO ceramic, generates Y2Cu2O5 and Mg at the ceramic side interface. 0.8 Cu 0.2 The O reaction layer ensures a good metallurgical bond at the ceramic interface. During the vacuum brazing process, the Ti element in the titanium alloy diffuses through the silver-based filler metal. Upon reaching the original cladding boundary, it combines with O atoms decomposed from the cladding layer, ultimately forming a TiO2 layer at the original cladding boundary, achieving a reliable brazed joint connection. The resulting joint can achieve a shear strength of 46 MPa.

Description

Technical Field

[0001] The invention relates to a brazing method for Y2O3-MgO ceramics and titanium alloy. Background Art

[0002] Infrared windows are crucial components for the integrated structure and function of high-speed aircraft. Currently, the main materials used for infrared windows include sapphire and MgF2, but these materials all have shortcomings. MgF2's poor thermal shock resistance makes it unsuitable for future infrared windows operating in high-temperature environments. Sapphire's self-radiation coefficient increases significantly at high temperatures, causing its own infrared radiation to interfere with external signal reception. With the continuous development of infrared window materials, a new generation of infrared window materials, Y2O3-MgO composite ceramics, have garnered widespread attention due to their low high-temperature self-radiation coefficient, excellent optical transmittance, mechanical strength, and thermal shock resistance. They are expected to be used in high-speed drones and other applications in the future. The application of infrared windows for high-speed aircraft often involves connecting them to lightweight, high-strength titanium alloys. However, due to friction and impact from air during flight, higher requirements are placed on the mechanical properties and thermal shock resistance of the connection between the infrared window and the titanium alloy.

[0003] Currently, there are few reports on methods for joining Y2O3-MgO ceramics to titanium alloys. Ceramic materials are typically joined to metals using methods such as bolting, gluing, and brazing. However, bolting is not suitable because it is difficult to machine complete mechanical holes in Y2O3-MgO ceramics and the bonding airtightness is poor. While gluing is simple, most ceramic-to-metal bonded joints are susceptible to aging and have poor thermal shock resistance. Vacuum brazing is a suitable method for joining Y2O3-MgO ceramics to titanium alloys due to its high welding quality, high service temperature, and long service life. However, due to the very stable chemical properties of Y2O3 and MgO, conventional metal brazing filler metals cannot form a good bond with the ceramic interface. Summary of the Invention

[0004] In order to solve the problem of poor interface bonding between Y2O3-MgO ceramics and metal materials during brazing, the present invention provides a method for indirect brazing of Y2O3-MgO ceramics and titanium alloys.

[0005] The indirect brazing method of Y2O3-MgO ceramic and titanium alloy of the present invention is carried out according to the following steps:

[0006] 1. Pre-welding treatment of Y2O3-MgO ceramics:

[0007] The Y2O3-MgO ceramic is cut into predetermined sizes, and then the surface to be welded is subjected to step-by-step grinding, ultrasonic cleaning, and solvent cleaning in sequence;

[0008] 2. Pre-welding treatment of titanium alloy:

[0009] The titanium alloy is cut into predetermined sizes, and then the surface to be welded is subjected to step-by-step grinding, ultrasonic cleaning and solvent cleaning in sequence;

[0010] 3. Preparation of Ag-CuO Cladding Layer on Y2O3-MgO Ceramic Surface:

[0011] Ag powder and CuO powder were weighed, mixed and ground to obtain an Ag-CuO cladding material, which was then dissolved in anhydrous ethanol to obtain an Ag-CuO cladding slurry. The Ag-CuO cladding slurry was then evenly coated on the surface of the Y2O3-MgO ceramic to be welded, and finally transferred to a muffle furnace for sintering.

[0012] The molar concentration of CuO in the Ag-CuO cladding material is 2 to 40%;

[0013] After the mixing, the mixture is ground for 5-30 minutes to obtain the Ag-CuO cladding material;

[0014] The mass fraction of the Ag-CuO cladding material in the Ag-CuO cladding slurry is 10-50%;

[0015] The sintering process is as follows: heating to 970-1100°C at a heating rate of 3-7°C / min, keeping the temperature for 10-30min, and cooling to room temperature at a cooling rate of 3-7°C / min; after sintering, CuO reacts with Y2O3 to generate Y2Cu2O5, and CuO reacts with MgO to generate Mg 0.8 Cu 0.2 O; firstly, the Y2O3-MgO ceramic side interface is metallurgically bonded with the Ag-CuO cladding layer, so as to achieve good overall interface bonding with the titanium alloy during the subsequent vacuum brazing process;

[0016] 4. Pre-treatment of silver-based solder foil:

[0017] Both surfaces of the silver-based solder foil were polished to remove the surface oxide film, and then ultrasonically cleaned and solvent cleaned;

[0018] The solvent cleaning is repeated 2 to 3 times with anhydrous ethanol or acetone;

[0019] 5. Assembly of welding specimens:

[0020] A silver-based brazing filler metal foil is placed between the surface of the titanium alloy to be welded and the Ag-CuO cladding layer on the surface of the Y2O3-MgO ceramic, with the Ag-CuO cladding layer on the surface of the Y2O3-MgO ceramic facing downward, to obtain a weldment;

[0021] 6. Place the parts to be welded into a vacuum brazing furnace for vacuum brazing to complete the indirect brazing of Y2O3-MgO ceramics and titanium alloy;

[0022] The vacuum brazing process comprises: under vacuum conditions, heating to 820°C to 900°C at a heating rate not exceeding 10°C / min and keeping the temperature for 10min to 40min, and then cooling to room temperature at a cooling rate not exceeding 10°C / min.

[0023] The principles and beneficial effects of the present invention are:

[0024] The present invention first prepares an Ag-CuO cladding layer on the surface of Y2O3-MgO ceramics, and generates Y2Cu2O5 and Mg at the ceramic side interface. 0.8 Cu 0.2 The O reaction layer ensures a good metallurgical bond at the ceramic interface. During the vacuum brazing process, the Ti element in the titanium alloy diffuses through the brazing filler metal. Upon reaching the original cladding boundary, it combines with O atoms decomposed from the cladding layer, ultimately forming a TiO2 layer at the original cladding boundary, thus achieving a brazed joint connection. The resulting joint can achieve a shear strength of 46 MPa. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a microstructure picture of the brazed joint between Y2O3-MgO ceramic and titanium alloy obtained in Example 1;

[0026] Figure 2 This is a microstructure picture of the brazed joint of Y2O3-MgO ceramic and titanium alloy obtained in Comparative Example 1;

[0027] Figure 3 This is a comparison chart of shear strength of brazed joints;

[0028] Figure 4 This is an elemental surface scanning image of the brazed joint of Y2O3-MgO ceramic and titanium alloy obtained in Example 1. DETAILED DESCRIPTION

[0029] The technical solution of the present invention is not limited to the specific implementation methods listed below, but also includes any reasonable combination of the specific implementation methods.

[0030] Specific embodiment 1: The indirect brazing method of Y2O3-MgO ceramics and titanium alloy in this embodiment is carried out according to the following steps:

[0031] 1. Pre-welding treatment of Y2O3-MgO ceramics:

[0032] The Y2O3-MgO ceramic is cut into predetermined sizes, and then the surface to be welded is subjected to step-by-step grinding, ultrasonic cleaning, and solvent cleaning in sequence;

[0033] 2. Pre-welding treatment of titanium alloy:

[0034] The titanium alloy is cut into predetermined sizes, and then the surface to be welded is subjected to step-by-step grinding, ultrasonic cleaning and solvent cleaning in sequence;

[0035] 3. Preparation of Ag-CuO Cladding Layer on Y2O3-MgO Ceramic Surface:

[0036] Ag powder and CuO powder were weighed, mixed and ground to obtain an Ag-CuO cladding material, which was then dissolved in anhydrous ethanol to obtain an Ag-CuO cladding slurry. The Ag-CuO cladding slurry was then evenly coated on the surface of the Y2O3-MgO ceramic to be welded, and finally transferred to a muffle furnace for sintering.

[0037] The molar concentration of CuO in the Ag-CuO cladding material is 2 to 40%;

[0038] After the mixing, the mixture is ground for 5-30 minutes to obtain the Ag-CuO cladding material;

[0039] The mass fraction of the Ag-CuO cladding material in the Ag-CuO cladding slurry is 10-50%;

[0040] The sintering process is as follows: heating to 970-1100°C at a heating rate of 3-7°C / min, keeping the temperature for 10-30min, and cooling to room temperature at a cooling rate of 3-7°C / min; after sintering, CuO reacts with Y2O3 to generate Y2Cu2O5, and CuO reacts with MgO to generate Mg 0.8 Cu 0.2 O; firstly, the Y2O3-MgO ceramic side interface is metallurgically bonded with the Ag-CuO cladding layer, so as to achieve good overall interface bonding with the titanium alloy during the subsequent vacuum brazing process;

[0041] 4. Pre-treatment of silver-based solder foil:

[0042] Both surfaces of the silver-based solder foil were polished to remove the surface oxide film, and then ultrasonically cleaned and solvent cleaned;

[0043] The solvent cleaning is repeated 2 to 3 times with anhydrous ethanol or acetone;

[0044] 5. Assembly of welding specimens:

[0045] A silver-based brazing filler metal foil is placed between the surface of the titanium alloy to be welded and the Ag-CuO cladding layer on the surface of the Y2O3-MgO ceramic, with the Ag-CuO cladding layer on the surface of the Y2O3-MgO ceramic facing downward, to obtain a weldment;

[0046] 6. Place the parts to be welded into a vacuum brazing furnace for vacuum brazing to complete the indirect brazing of Y2O3-MgO ceramics and titanium alloy;

[0047] The vacuum brazing process comprises: under vacuum conditions, heating to 820°C to 900°C at a heating rate not exceeding 10°C / min and keeping the temperature for 10min to 40min, and then cooling to room temperature at a cooling rate not exceeding 10°C / min.

[0048] This embodiment has the following beneficial effects:

[0049] In this embodiment, a Ag-CuO cladding layer is first prepared on the surface of Y2O3-MgO ceramics, and Y2Cu2O5 and Mg2O3 are formed at the interface of the ceramic side. 0.8 Cu 0.2 The O reaction layer ensures a good metallurgical bond at the ceramic interface. During the vacuum brazing process, the Ti element in the titanium alloy diffuses through the brazing filler metal. Upon reaching the original cladding boundary, it combines with O atoms decomposed from the cladding layer, ultimately forming a TiO2 layer at the original cladding boundary, thus achieving a brazed joint connection. The resulting joint can achieve a shear strength of 46 MPa.

[0050] Specific embodiment 2: This embodiment differs from specific embodiment 1 in that: in step 1, 400-3000 mesh diamond sandpaper is used for the step-by-step grinding of the surface to be welded.

[0051] Specific embodiment three: This embodiment differs from specific embodiment one or two in that: the ultrasonic cleaning in step one is performed in an ultrasonic cleaning instrument, and the cleaning time is 10-20 minutes.

[0052] Specific embodiment 4: This embodiment differs from any one of specific embodiments 1 to 3 in that: the solvent used in the solvent cleaning in step 1 is anhydrous ethanol or acetone.

[0053] Specific embodiment 5: This embodiment differs from any one of specific embodiments 1 to 4 in that: in step 2, 400-3000 mesh diamond sandpaper is used for the stepwise grinding of the surface to be welded.

[0054] Specific embodiment 6: This embodiment differs from any one of specific embodiments 1 to 5 in that: the ultrasonic cleaning in step 2 is performed in an ultrasonic cleaning instrument, and the cleaning time is 5-60 minutes.

[0055] Specific embodiment seven: This embodiment differs from any one of specific embodiments one to six in that the solvent used in the solvent cleaning in step two is anhydrous ethanol or acetone.

[0056] Specific embodiment eight: This embodiment differs from any one of specific embodiments one to seven in that the titanium alloy in step two is TC4 alloy.

[0057] Specific embodiment 9: This embodiment differs from any one of specific embodiments 1 to 8 in that: in step 4, 400-3000 grit sandpaper is used for polishing both surfaces of the silver-based solder foil.

[0058] Specific embodiment ten: This embodiment differs from any one of specific embodiments one to nine in that: the ultrasonic cleaning time in step four is 5-60 minutes.

[0059] Specific embodiment eleven: This embodiment differs from specific embodiments one to ten in that the silver-based solder foil is Ag-Cu solder foil, Ag-Cu-In solder foil, Ag-Cu-Ni solder foil or Ag-Cu-Ti solder foil.

[0060] Example 1:

[0061] The indirect brazing method of Y2O3-MgO ceramic and titanium alloy in this embodiment is carried out according to the following steps:

[0062] 1. Pre-welding treatment of Y2O3-MgO ceramics:

[0063] The Y2O3-MgO ceramics were cut into 4mm×4mm×3mm specimens, and then the surface to be welded was polished, ultrasonically cleaned, and then solvent cleaned in sequence.

[0064] The stepwise grinding of the surface to be welded uses 400 mesh, 800 mesh, 1500 mesh and 2000 mesh diamond sandpaper;

[0065] The ultrasonic cleaning is carried out in an ultrasonic cleaning instrument, and the cleaning time is 20 minutes;

[0066] The solvent used in the solvent cleaning is anhydrous ethanol;

[0067] 2. Pre-welding treatment of titanium alloy:

[0068] The titanium alloy was cut into specimens of 15 mm × 10 mm × 3 mm, and then the surface to be welded was subjected to step-by-step grinding, ultrasonic cleaning, and solvent cleaning in sequence;

[0069] The step-by-step grinding of the surface to be welded uses 400 mesh, 800 mesh, and 1500 mesh diamond sandpaper;

[0070] The ultrasonic cleaning is carried out in an ultrasonic cleaning instrument, and the cleaning time is 20 minutes;

[0071] The solvent used in the solvent cleaning is anhydrous ethanol;

[0072] The titanium alloy is TC4 alloy;

[0073] 3. Preparation of Ag-CuO Cladding Layer on Y2O3-MgO Ceramic Surface:

[0074] Ag powder and CuO powder were weighed, mixed and ground to obtain an Ag-CuO cladding material, which was then dissolved in anhydrous ethanol to obtain an Ag-CuO cladding slurry. The Ag-CuO cladding slurry was then evenly coated on the surface of the Y2O3-MgO ceramic to be welded, and finally transferred to a muffle furnace for sintering.

[0075] The molar concentration of CuO in the Ag-CuO cladding material is 8%;

[0076] After mixing, grinding is performed for 20 minutes to obtain the Ag-CuO cladding material;

[0077] The mass fraction of the Ag-CuO cladding material in the Ag-CuO cladding slurry is 40%;

[0078] The sintering process is as follows: heating to 1000°C at a heating rate of 5°C / min, keeping the temperature for 30 minutes, and cooling to room temperature at a cooling rate of 5°C / min;

[0079] 4. Pre-treatment of Ag-Cu solder foil:

[0080] Both surfaces of the Ag-Cu solder foil were polished to remove the surface oxide film, and then ultrasonically cleaned. The size of the Ag-Cu solder foil was 6 mm × 6 mm. The mass ratio of Ag to Cu in the Ag-Cu solder foil was 72:28.

[0081] The two surfaces of the Ag-Cu solder foil were polished with 1000-grit sandpaper;

[0082] The mass ratio of Ag to Cu in the Ag-Cu solder foil is 72:28;

[0083] The ultrasonic cleaning time is 20 minutes; the frequency of the ultrasonic cleaning machine is 100kHz;

[0084] The solvent cleaning was repeated 3 times with anhydrous ethanol;

[0085] 5. Assembly of welding specimens:

[0086] The Ag-Cu brazing filler metal foil is placed between the surface to be welded of the titanium alloy and the Ag-CuO cladding layer on the surface of the Y2O3-MgO ceramic, with the Ag-CuO cladding layer on the surface of the Y2O3-MgO ceramic facing downward, to obtain a workpiece to be welded;

[0087] 6. Place the parts to be welded into a vacuum brazing furnace for vacuum brazing to complete the indirect brazing of Y2O3-MgO ceramics and titanium alloy;

[0088] The vacuum brazing process is as follows: under vacuum conditions, heating to 860° C. at a heating rate of 10° C. / min and keeping the temperature for 20 minutes, and then cooling to room temperature at a cooling rate of 5° C. / min.

[0089] Comparative Example 1:

[0090] The indirect brazing method of Y2O3-MgO ceramic and titanium alloy in this embodiment is carried out according to the following steps:

[0091] 1. Pre-welding treatment of Y2O3-MgO ceramics:

[0092] The Y2O3-MgO ceramics were cut into 4mm×4mm×3mm specimens, and then the surface to be welded was polished, ultrasonically cleaned, and then solvent cleaned in sequence.

[0093] The stepwise grinding of the surface to be welded uses 400 mesh, 800 mesh, 1500 mesh and 2000 mesh diamond sandpaper;

[0094] The ultrasonic cleaning is carried out in an ultrasonic cleaning instrument, and the cleaning time is 20 minutes;

[0095] The solvent used in the solvent cleaning is anhydrous ethanol;

[0096] 2. Pre-welding treatment of titanium alloy:

[0097] The titanium alloy was cut into specimens of 15 mm × 10 mm × 3 mm, and then the surface to be welded was subjected to step-by-step grinding, ultrasonic cleaning, and solvent cleaning in sequence;

[0098] The step-by-step grinding of the surface to be welded uses 400 mesh, 800 mesh, and 1500 mesh diamond sandpaper;

[0099] The ultrasonic cleaning is carried out in an ultrasonic cleaning instrument, and the cleaning time is 20 minutes;

[0100] The solvent used in the solvent cleaning is anhydrous ethanol;

[0101] The titanium alloy is TC4 alloy;

[0102] 3. Pre-treatment of Ag-Cu solder foil:

[0103] Both surfaces of the Ag-Cu solder foil were polished to remove the surface oxide film, and then ultrasonically cleaned. The size of the Ag-Cu solder foil was 6 mm × 6 mm. The mass ratio of Ag to Cu in the Ag-Cu solder foil was 72:28.

[0104] The two surfaces of the Ag-Cu solder foil were polished with 1000-grit sandpaper;

[0105] The mass ratio of Ag to Cu in the Ag-Cu solder foil is 72:28;

[0106] The ultrasonic cleaning time is 20 minutes; the frequency of the ultrasonic cleaning machine is 100kHz;

[0107] The solvent cleaning was repeated 3 times with anhydrous ethanol;

[0108] 4. Assembly of welding specimens:

[0109] Placing an Ag-Cu brazing filler metal foil between the surface to be welded of the titanium alloy and the Ag-CuO cladding layer on the surface of the Y2O3-MgO ceramic to obtain a welded part;

[0110] 5. Place the parts to be welded into a vacuum brazing furnace for vacuum brazing to complete the indirect brazing of Y2O3-MgO ceramics and titanium alloy;

[0111] The vacuum brazing process is as follows: under vacuum conditions, heating to 860° C. at a heating rate of 10° C. / min and keeping the temperature for 20 minutes, and then cooling to room temperature at a cooling rate of 5° C. / min.

[0112] The shear test was carried out using an electronic universal testing machine at a loading speed of 0.5 mm / min. The room temperature shear strength of the connection joint obtained in Example 1 reached 46 MPa. Figure 1 This is a microstructure picture of the brazed joint between Y2O3-MgO ceramic and titanium alloy obtained in Example 1;

[0113] Figure 4 The element surface scan of the brazed joint of Y2O3-MgO ceramic and titanium alloy obtained in Example 1; Table 1 is the EDS analysis results of each phase in Example 1. Figure 1 、 Figure 4 As shown in Table 1, in Example 1, a Ag-CuO cladding layer was first prepared on the surface of Y2O3-MgO ceramics, and Y2Cu2O5 and Mg2O3-MgO ceramics were formed at the interface of the ceramics. 0.8 Cu 0.2 The O reaction layer ensures good metallurgical bonding on the ceramic side interface. Then, during the vacuum brazing process, the Ti element in the titanium alloy diffuses in the brazing filler metal. When it diffuses to the original cladding boundary, it combines with the O atoms decomposed in the cladding layer, eventually forming a TiO2 layer at the original cladding boundary, thus achieving brazed joint connection.

[0114] Table 1

[0115]

[0116] The shear test was carried out using an electronic universal testing machine with a loading speed of 0.5 mm / min. The room temperature shear strength of the connection joint obtained in Comparative Example 1 reached 22 MPa. Figure 2 The microstructure picture of the brazed joint of Y2O3-MgO ceramic and titanium alloy obtained in Comparative Example 1; Figure 2 As shown, Comparative Example 1 has a large number of unwelded areas at the ceramic interface. This is due to the very weak reaction between the Ag-Cu and Y2O3-MgO ceramic, which, under the action of large residual stress, leads to through-cracks on the Y2O3-MgO ceramic side. This is because the reaction between the Ag-Cu and Y2O3-MgO ceramic is very weak, and the resulting large residual stress causes cracking at the reaction interface on the Y2O3-MgO ceramic side, resulting in low shear strength of the joint.

[0117] Figure 3 The figure is a comparison of the shear strength of brazed joints. Due to the good interface bonding between the Y2O3-MgO ceramic with the Ag-CuO cladding layer in Example 1 and the TC4 brazed joint, the shear strength of the joint is increased by 109% compared to that of the comparative example 1 without the cladding layer.

Claims

1. A method for indirect brazing of Y2O3-MgO ceramics and titanium alloys, characterized by: The indirect brazing method of Y2O3-MgO ceramics and titanium alloy is carried out according to the following steps:

1. Pre-welding treatment of Y2O3-MgO ceramics: The Y2O3-MgO ceramic is cut into predetermined sizes, and then the surface to be welded is subjected to step-by-step grinding, ultrasonic cleaning, and solvent cleaning in sequence; 2. Pre-welding treatment of titanium alloy: The titanium alloy is cut into predetermined sizes, and then the surface to be welded is subjected to step-by-step grinding, ultrasonic cleaning and solvent cleaning in sequence; 3. Preparation of Ag-CuO Cladding Layer on Y2O3-MgO Ceramic Surface: Ag powder and CuO powder were weighed, mixed and ground to obtain an Ag-CuO cladding material, which was then dissolved in anhydrous ethanol to obtain an Ag-CuO cladding slurry. The Ag-CuO cladding slurry was then evenly coated on the surface of the Y2O3-MgO ceramic to be welded, and finally transferred to a muffle furnace for sintering. The molar concentration of CuO in the Ag-CuO cladding material is 2 to 40%; After the mixing, the mixture is ground for 5-30 minutes to obtain the Ag-CuO cladding material; The mass fraction of the Ag-CuO cladding material in the Ag-CuO cladding slurry is 10-50%; The sintering process is as follows: heating to 970-1100°C at a heating rate of 3-7°C / min, keeping the temperature for 10-30min, and cooling to room temperature at a cooling rate of 3-7°C / min; after sintering, CuO reacts with Y2O3 to generate Y2Cu2O5, and CuO reacts with MgO to generate Mg 0.8 Cu 0.2 O; firstly, the Y2O3-MgO ceramic side interface is metallurgically bonded with the Ag-CuO cladding layer, so as to achieve good overall interface bonding with the titanium alloy during the subsequent vacuum brazing process; 4. Pre-treatment of silver-based solder foil: Both surfaces of the silver-based solder foil were polished to remove the surface oxide film, and then ultrasonically cleaned and solvent cleaned; The solvent cleaning is repeated 2 to 3 times with anhydrous ethanol or acetone; 5. Assembly of welding specimens: A silver-based brazing filler metal foil is placed between the surface of the titanium alloy to be welded and the Ag-CuO cladding layer on the surface of the Y2O3-MgO ceramic, with the Ag-CuO cladding layer on the surface of the Y2O3-MgO ceramic facing downward, to obtain a weldment; 6. Place the parts to be welded into a vacuum brazing furnace for vacuum brazing to complete the indirect brazing of Y2O3-MgO ceramics and titanium alloy; The vacuum brazing process comprises: under vacuum conditions, heating to 820°C to 900°C at a heating rate not exceeding 10°C / min and keeping the temperature for 10min to 40min, and then cooling to room temperature at a cooling rate not exceeding 10°C / min.

2. The indirect brazing method of Y2O3-MgO ceramics and titanium alloy according to claim 1, characterized in that: When performing step-by-step grinding of the surface to be welded as described in step 1, 400-3000 mesh diamond sandpaper is used.

3. The indirect brazing method of Y2O3-MgO ceramics and titanium alloy according to claim 1, characterized in that: The ultrasonic cleaning in step 1 is carried out in an ultrasonic cleaning instrument, and the cleaning time is 10-20 minutes.

4. The indirect brazing method of Y2O3-MgO ceramics and titanium alloy according to claim 1, characterized in that: The solvent used in the solvent cleaning in step 1 is anhydrous ethanol or acetone.

5. The indirect brazing method of Y2O3-MgO ceramics and titanium alloy according to claim 1, characterized in that: In step 2, diamond sandpaper with a mesh size of 400 to 3000 is used for the step-by-step grinding of the surface to be welded.

6. The indirect brazing method of Y2O3-MgO ceramics and titanium alloy according to claim 1, characterized in that: The ultrasonic cleaning in step 2 is carried out in an ultrasonic cleaning instrument, and the cleaning time is 5-60 minutes.

7. The indirect brazing method of Y2O3-MgO ceramics and titanium alloy according to claim 1, characterized in that: The solvent used in the solvent cleaning in step 2 is anhydrous ethanol or acetone.

8. The indirect brazing method of Y2O3-MgO ceramics and titanium alloy according to claim 1, characterized in that: The titanium alloy in step 2 is TC4 alloy.

9. The indirect brazing method of Y2O3-MgO ceramics and titanium alloy according to claim 1, characterized in that: In step 4, the two surfaces of the silver-based solder foil are polished using 400-3000 grit sandpaper.

10. The indirect brazing method of Y2O3-MgO ceramics and titanium alloy according to claim 1, characterized in that: The ultrasonic cleaning time in step 4 is 5-60 minutes.

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