A process for the preparation of platinum gold jaws

Abstract

A manufacturing process for a platinum nozzle plate, relating to the field of nozzle plate technology, includes the following steps: S1. A base plate is made from a platinum-based material with a low oxide dispersion phase, and several mounting holes are machined on the base plate. Several leak nozzles are made from a platinum-based material with a high oxide dispersion phase. S2. After pretreatment of the base plate and the leak nozzles prepared in S1, the leak nozzles are interference-fitted one-to-one with the mounting holes on the base plate to obtain a nozzle plate assembly. S3. The nozzle plate assembly obtained in S2 is subjected to vacuum diffusion welding to weld and fix each leak nozzle to the corresponding mounting hole on the base plate to obtain a rough nozzle plate. S4. The base plate in the rough nozzle plate obtained in S3 is shaped. S5. The rough nozzle plate after the shaping treatment in S4 is subjected to automatic laser re-welding. After the welding is completed, a leakage test is performed. If the test is successful, the finished platinum nozzle plate is obtained.

Description

Technical Field

[0001] This invention relates to the field of sprue technology, and more specifically to a process for preparing a platinum nozzle plate. Background Technology

[0002] As the core and key device in glass fiber furnace drawing operations, the sprue plate mainly consists of a base plate and densely arranged sprues (400-8000). The performance of the sprue plate directly affects the output, quality, production stability, and production cost of glass fiber.

[0003] Currently, the forming processes for platinum nozzle plates mainly include integral stamping and welding. While integral stamping allows the base plate and nozzle to be integrated and achieves high strength, it suffers from drawbacks such as the scrapping of the entire plate due to damage to a single nozzle and poor mold versatility, and has been gradually replaced by welding. Commonly used welding processes in the industry mainly include non-filler argon arc welding and laser welding. Argon arc welding equipment is moderately priced and easy to operate, but it suffers from wide welds, large thermal deformation, and easy damage to the dispersed strengthening phase of the base plate. Laser welding, on the other hand, features concentrated heating, small thermal deformation, and high weld strength, but it results in significant loss of precious metals and lower weld toughness, making it prone to porosity and microcracks.

[0004] With the presence of oxide dispersions (ZrO2, rare earth oxides Re) x O y The widespread use of platinum-based materials in base plates and nozzles has presented significant challenges to existing welding processes. The presence of oxide-dispersed reinforcing phases greatly increases the difficulty of welding. Specifically, argon arc welding easily leads to oxide particles floating to the surface, resulting in the loss of dispersion reinforcement and causing uneven thermal deformation and microcracks; while laser welding suffers from difficulties in weld formation, insufficient coverage, incomplete penetration, and uneven distribution of dispersed phases. Summary of the Invention

[0005] In view of the shortcomings of the existing technology, the purpose of this invention is to provide a manufacturing process for platinum nozzle plates, so as to solve the problems of thermal deformation, unstable weld quality and material performance degradation that occur in the welding process of high-content dispersed reinforcing phase materials when using a single welding process to prepare platinum nozzle plates.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A manufacturing process for a platinum nozzle plate includes the following steps:

[0008] S1. Select a platinum-based material with low oxide dispersion phase to make a base plate, and process several mounting holes on the base plate. Select a platinum-based material with high oxide dispersion phase to make several nozzles.

[0009] S2. After pre-treating the base plate and several nozzles prepared in S1, the nozzles are interference-fitted one by one with the mounting holes on the base plate to obtain the nozzle plate assembly.

[0010] S3. Vacuum diffusion welding is performed on the nozzle plate assembly obtained in S2 to weld and fix each nozzle to the corresponding mounting hole on the base plate to obtain a rough nozzle plate.

[0011] S4. The bottom plate in the rough nozzle plate obtained in S3 is subjected to a shaping process;

[0012] S5. The rough nozzle plate after S4 calibration is automatically laser-welded. After the welding is completed, a leakage test is performed. If the test is successful, the finished platinum nozzle plate is obtained.

[0013] Preferably, in step S1, the content of oxide dispersed phase in the platinum-based material with low oxide dispersed phase is 0.02~0.35wt%, the content of oxide dispersed phase in the platinum-based material with high oxide dispersed phase is 0.35~1.0wt%, and the rhodium content in both platinum-based materials is 0~20wt%.

[0014] Preferably, in step S1, one end of the leak nozzle is a straight pipe section and the other end is a tapered pipe section. The straight pipe section of the leak nozzle is used to make an interference fit with the corresponding mounting hole. The length of the straight pipe section of the leak nozzle is the same as the thickness of the base plate, and the outer diameter of the straight pipe section of the leak nozzle is 0.01~0.02mm larger than the diameter of the mounting hole.

[0015] Preferably, in step S2, the pretreatment method is as follows: the base plate is placed in a magnetic polishing machine for grinding and polishing, the nozzle is placed on a vibration testing machine platform for grinding and polishing, and then the treated base plate and nozzle are chemically purified respectively.

[0016] Preferably, the specific parameters for the grinding and polishing treatment of the base plate are as follows: the polishing medium is a 0.2~0.5mm fine-diameter stainless steel needle, paired with W3.5~W5 fine-grained polishing paste; the mass ratio of stainless steel needle, workpiece and polishing paste is controlled at 8:1:0.03; the polishing fluid is deionized water; the power of the polishing equipment is set to 300~500W; the magnetic field strength is adjusted to 0.15~0.3T; the polishing time is 20~30min; and the polishing speed is controlled at 1000~1500r / min.

[0017] Preferably, the specific parameters for the grinding and polishing treatment of the nozzle are as follows: the polishing medium is ZrO2 balls with a diameter of 2.0~3.0mm, paired with W3.5~W5 fine-grained polishing paste, the mass ratio of ZrO2, workpiece and polishing paste is controlled at 4:1:0.03, the polishing fluid is deionized water, the vibration test machine has an adjustable amplitude of 0~5mm under no-load, and the vibration time is 10~20min for polishing.

[0018] Preferably, the specific operation of chemical purification is as follows: ultrasonic cleaning of the base plate and the nozzle is performed using a mixed solution of acetone and anhydrous ethanol, wherein the volume ratio of acetone to anhydrous ethanol is 1:1, the ultrasonic power is 200~300W, and the ultrasonic cleaning time is 15~20min.

[0019] Preferably, in step S3, the specific operation of vacuum diffusion welding is as follows: the nozzle plate assembly is fed into the vacuum diffusion welding furnace, and the vacuum degree inside the furnace is evacuated to ≤2×10 -2 Pa, with a uniform heating rate of 10~15℃ / min, the furnace temperature is raised to 1240~1750℃, held for 60~120min, and then the furnace temperature is reduced to below 500℃ at a cooling rate of 5~10℃ / min. Subsequently, the furnace is cooled to room temperature. The welding depth of vacuum diffusion welding is 1.3~2.0mm.

[0020] Preferably, in step S5, a fiber laser welding machine is used for automatic laser re-welding. The laser wavelength is 1030nm, the laser power is 700~900W, the welding speed is 0.5~2.0m / min, the pulse width is 10~20ms, the shielding gas is high-purity argon with a purity ≥99.999%, and the shielding gas flow rate is 10~20L / min. The weld width of the automatic laser re-welding is controlled between 0.8~1.5mm, and the welding depth is 1~2mm.

[0021] Preferably, in step S5, a permeate is used for leakage detection.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] 1. This invention employs a combined approach of "interference fit + vacuum diffusion welding + automatic laser re-welding" to ensure that the oxide dispersion strengthening phase is uniformly distributed and undamaged during the welding process. This achieves a density of ≥99.8% at the connection between the base plate and the nozzle, and guarantees that the connection strength reaches over 90% of the strength of the platinum-based material. Simultaneously, it retains the high-temperature oxidation resistance, wear resistance, and high-temperature strength of the platinum-based material, filling the technological gap in welding nozzles to base plates using platinum-based materials with high oxide dispersion phases.

[0024] 2. This invention achieves atomic-level metallurgical bonding through vacuum diffusion welding. Combined with the compressive stress formed by interference fit, it effectively eliminates microscopic gaps at the interface and effectively avoids defects such as porosity and incomplete welding. Then, laser automatic re-welding is used to precisely repair hidden defects and ensure sealing, thus completely solving the problem of medium leakage during the service of the nozzle plate.

[0025] 3. The preparation process provided by this invention significantly reduces the frequency of nozzle plate failure and replacement due to welding defects or nozzle wear, and reduces the high preparation and rework costs of precious metal platinum and platinum-based materials with high oxide dispersion phase, thereby effectively reducing the overall cost of glass fiber production, enhancing the market competitiveness of the product, and possessing outstanding cost advantages and industrial application potential.

[0026] Other advantages, objectives and features of the present invention will become apparent in part from the following description, and in part from those skilled in the art through study and practice of the invention. Attached Figure Description

[0027] Figure 1 This is a process flow diagram of the present invention.

[0028] Figure 2 These are the top and right views of the nozzle plate in this invention.

[0029] Figure 3 This is a partial cross-sectional view of the base plate in this invention.

[0030] Figure 4 This is a cross-sectional view of the leak nozzle in this invention.

[0031] The numbers in the diagram are as follows: 1. Base plate; 11. Mounting hole; 2. Drain nozzle. Detailed Implementation

[0032] To make the technical means, creative features, objectives, and effects of this invention clearer and easier to understand, the invention will be further described below in conjunction with the accompanying drawings and specific embodiments:

[0033] Example 1

[0034] S1. A base plate 1 is made of a platinum-based material with an oxide dispersed phase content of 0.3wt%. The base plate 1 is a single base plate with 3200 mounting holes 11, denoted as SB3200. The thickness of the base plate 1 is 1.4mm, and the diameter of each mounting hole 11 is 2.7mm.

[0035] The leak nozzle 2 is made of a platinum-based material with an oxide dispersed phase content of 0.9 wt%. The inner diameter of the leak nozzle 2 is 1.65 mm, the outer diameter of the straight pipe section of the leak nozzle 2 is 2.72 mm, the length of the straight pipe section of the leak nozzle 2 is 1.4 mm, the length of the tapered pipe section of the leak nozzle 2 is 3.1 mm, and the wall thickness at the thinnest point of the leak nozzle 2 is 0.30 mm.

[0036] The rhodium content in the above platinum-based material is 0 wt%;

[0037] S2. Pre-treatment of base plate 1: Base plate 1 is placed in a magnetic polishing machine for polishing. The specific parameters are as follows: polishing medium is 0.4mm stainless steel needle, W5.0 fine-grained polishing paste, deionized water is used as polishing fluid, the mass ratio of steel needle, workpiece and polishing paste is 8:1:0.03, polishing power is 400W, magnetic field strength is 0.30T, polishing time is 15min, and rotation speed is 1200r / min. Subsequently, base plate 1 is ultrasonically cleaned with a mixed solution of acetone and anhydrous ethanol, wherein the volume ratio of acetone to anhydrous ethanol is 1:1, the ultrasonic power is 250W, and the ultrasonic cleaning time is 15min.

[0038] Pre-treatment of several nozzles 2: The nozzles 2 were placed on the vibration testing machine platform for grinding and polishing. The specific parameters were as follows: the polishing medium was 2.5mm ZrO2 balls, W4.0 fine-grained polishing paste, and deionized water was used as the polishing liquid. The mass ratio of ZrO2, workpiece and polishing paste was 4:1:0.03. The no-load amplitude of the vibration machine was 3.0mm. The polishing time was 15min. Subsequently, the base plate 1 was ultrasonically cleaned with a mixed solution of acetone and anhydrous ethanol. The volume ratio of acetone to anhydrous ethanol was 1:1. The ultrasonic power was 300W. The ultrasonic cleaning time was 15min.

[0039] An automatic nozzle assembly device is used to fit and position the pre-treated nozzles 2 one-to-one with the mounting holes 11 opened on the base plate 1 to obtain the nozzle plate assembly.

[0040] S3. The nozzle plate assembly prepared in S2 is placed into a vacuum diffusion welding furnace, and the vacuum level inside the furnace is evacuated to 2.0 × 10⁻⁶. -2 Pa, with a uniform heating rate of 15℃ / min, the furnace temperature is raised to 1350℃ and held for 120min. Then, the furnace temperature is lowered to below 500℃ at a cooling rate of 10℃ / min and then cooled to room temperature with the furnace to obtain the crude nozzle plate.

[0041] S4. Perform a shaping process on the bottom plate 1 in the rough product of the nozzle plate obtained in S3;

[0042] S5. The rough nozzle plate after S4 calibration is automatically laser-welded using a fiber laser welding machine. The specific parameters are: laser wavelength 1030nm; laser power 700W; welding speed 2.0m / min; pulse width 10ms; shielding gas is high-purity argon with a purity ≥99.999% and a flow rate of 10L / min; the weld width of the automatic laser re-welding is 1.0mm.

[0043] S6. Use penetrating fluid to test the weld for leakage. After the test is successful, the finished platinum nozzle plate is obtained.

[0044] Example 2

[0045] S1. A base plate 1 is made of a platinum-based material with an oxide dispersed phase content of 0.25wt%. The base plate 1 is a double base plate with 4800 mounting holes 11, denoted as DB4800. The thickness of the base plate 1 is 1.5mm, and the diameter of each mounting hole 11 is 2.7mm.

[0046] The leak nozzle 2 is made of a platinum-based material with an oxide dispersed phase content of 0.8 wt%. The inner diameter of the leak nozzle 2 is 1.45 mm, the outer diameter of the straight pipe section of the leak nozzle 2 is 2.72 mm, the length of the straight pipe section of the leak nozzle 2 is 1.5 mm, the length of the tapered pipe section of the leak nozzle 2 is 3.0 mm, and the wall thickness at the thinnest point of the leak nozzle 2 is 0.25 mm.

[0047] The rhodium content in the above platinum-based material is 5 wt%;

[0048] S2. Pre-treatment of base plate 1: Base plate 1 is placed in a magnetic polishing machine for polishing. The specific parameters are as follows: polishing medium is 0.5mm stainless steel needle, W4.0 fine-grained polishing paste, deionized water is used as polishing fluid, the mass ratio of steel needle, workpiece and polishing paste is 8:1:0.03, polishing power is 350W, magnetic field strength is 0.20T, polishing time is 20min, and rotation speed is 1000r / min. Subsequently, base plate 1 is ultrasonically cleaned with a mixed solution of acetone and anhydrous ethanol, wherein the volume ratio of acetone to anhydrous ethanol is 1:1, the ultrasonic power is 200W, and the ultrasonic cleaning time is 20min.

[0049] Pre-treatment of several nozzles 2: The nozzles 2 are placed on the vibration testing machine platform for grinding and polishing. The specific parameters are as follows: the polishing medium is 3.0 mm ZrO2 balls, W3.5 fine-grained polishing paste, deionized water is used as polishing liquid, the mass ratio of ZrO2, workpiece and polishing paste is 4:1:0.03, the no-load amplitude of the vibration machine is 3.5 mm, and the polishing time is 20 min. Subsequently, the base plate 1 is ultrasonically cleaned with a mixed solution of acetone and anhydrous ethanol, wherein the volume ratio of acetone to anhydrous ethanol is 1:1, the ultrasonic power is 200 W, and the ultrasonic cleaning time is 20 min.

[0050] An automatic nozzle assembly device is used to fit and position the pre-treated nozzles 2 one-to-one with the mounting holes 11 opened on the base plate 1 to obtain the nozzle plate assembly.

[0051] S3. The nozzle plate assembly prepared in S2 is placed into a vacuum diffusion welding furnace, and the vacuum level inside the furnace is evacuated to 5.0 × 10⁻⁶. -3 Pa, the furnace temperature is raised to 1500℃ at a uniform heating rate of 10℃ / min, held for 90min, and then the furnace temperature is lowered to below 500℃ at a cooling rate of 15℃ / min. The furnace is then cooled to room temperature to obtain the crude nozzle plate.

[0052] S4. Perform a shaping process on the bottom plate 1 in the rough product of the nozzle plate obtained in S3;

[0053] S5. The rough nozzle plate after S4 calibration is automatically laser-welded using a fiber laser welding machine. The specific parameters are: laser wavelength 1030nm; laser power 800W; welding speed 1.5m / min; pulse width 10ms; shielding gas is high-purity argon with a purity ≥99.999% and a flow rate of 8L / min; the weld width of the automatic laser re-welding is 1.2mm.

[0054] S6. Use penetrating fluid to test the weld for leakage. After the test is successful, the finished platinum nozzle plate is obtained.

[0055] Example 3

[0056] S1. A base plate 1 is made of a platinum-based material with an oxide dispersed phase content of 0.22 wt%. The base plate 1 is a single base plate with 1200 mounting holes 11, denoted as SB1200. The thickness of the base plate 1 is 1.4 mm, and the diameter of each mounting hole 11 is 2.24 mm.

[0057] The leak nozzle 2 is made of a platinum-based material with an oxide dispersed phase content of 0.55 wt%. The inner diameter of the leak nozzle 2 is 1.15 mm, the outer diameter of the straight pipe section of the leak nozzle 2 is 2.25 mm, the length of the straight pipe section of the leak nozzle 2 is 1.4 mm, the length of the tapered pipe section of the leak nozzle 2 is 4.1 mm, and the wall thickness at the thinnest point of the leak nozzle 2 is 0.22 mm.

[0058] The rhodium content in the above platinum-based material is 10 wt%;

[0059] S2. Pre-treatment of base plate 1: Base plate 1 is placed in a magnetic polishing machine for polishing. The specific parameters are as follows: polishing medium is 0.2mm stainless steel needle, W3.5 fine-grained polishing paste, deionized water is used as polishing fluid, the mass ratio of steel needle, workpiece and polishing paste is 8:1:0.03, polishing power is 300W, magnetic field strength is 0.25T, polishing time is 25min, and rotation speed is 1300r / min. Subsequently, base plate 1 is ultrasonically cleaned with a mixed solution of acetone and anhydrous ethanol, wherein the volume ratio of acetone to anhydrous ethanol is 1:1, the ultrasonic power is 300W, and the ultrasonic cleaning time is 15min.

[0060] Pre-treatment of several nozzles 2: The nozzles 2 are placed on the vibration testing machine platform for grinding and polishing. The specific parameters are as follows: the polishing medium is 2.0 mm ZrO2 balls, W3.5 fine-grained polishing paste, deionized water is used as polishing liquid, the mass ratio of ZrO2, workpiece and polishing paste is 4:1:0.03, the no-load amplitude of the vibration machine is 3.0 mm, and the polishing time is 15 min. Subsequently, the base plate 1 is ultrasonically cleaned with a mixed solution of acetone and anhydrous ethanol, wherein the volume ratio of acetone to anhydrous ethanol is 1:1, the ultrasonic power is 250 W, and the ultrasonic cleaning time is 15 min.

[0061] An automatic nozzle assembly device is used to fit and position the pre-treated nozzles 2 one-to-one with the mounting holes 11 opened on the base plate 1 to obtain the nozzle plate assembly.

[0062] S3. The nozzle plate assembly prepared in S2 is placed into a vacuum diffusion welding furnace, and the vacuum level inside the furnace is evacuated to 6.0 × 10⁻⁶. -3 Pa, with a uniform heating rate of 13℃ / min, the furnace temperature is raised to 1600℃ and held for 60min. Then, the furnace temperature is lowered to below 500℃ at a cooling rate of 8℃ / min and then cooled to room temperature with the furnace to obtain the crude nozzle plate.

[0063] S4. Perform a shaping process on the bottom plate 1 in the rough product of the nozzle plate obtained in S3;

[0064] S5. The rough nozzle plate after S4 calibration is automatically laser-welded using a fiber laser welding machine. The specific parameters are: laser wavelength 1030nm; laser power 800W; welding speed 1.8m / min; pulse width 13ms; shielding gas is high-purity argon with a purity ≥99.999% and a flow rate of 14L / min; the weld width of the laser-automatic re-welding is 0.9mm.

[0065] S6. Use penetrating fluid to test the weld for leakage. After the test is successful, the finished platinum nozzle plate is obtained.

[0066] Example 4

[0067] S1. A base plate 1 is made of a platinum-based material with an oxide dispersed phase content of 0.15wt%. The base plate 1 is a single base plate with 600 mounting holes 11, denoted as SB600. The thickness of the base plate 1 is 1.5mm, and the diameter of each mounting hole 11 is 2.26mm.

[0068] The leak nozzle 2 is made of a platinum-based material with an oxide dispersed phase content of 0.35 wt%. The inner diameter of the leak nozzle 2 is 1.25 mm, the outer diameter of the straight pipe section of the leak nozzle 2 is 2.28 mm, the length of the straight pipe section of the leak nozzle 2 is 1.5 mm, the length of the tapered pipe section of the leak nozzle 2 is 4.5 mm, and the wall thickness at the thinnest point of the leak nozzle 2 is 0.35 mm.

[0069] The rhodium content in the above platinum-based material is 20 wt%;

[0070] S2. Pre-treatment of base plate 1: Base plate 1 is placed in a magnetic polishing machine for polishing. The specific parameters are as follows: the polishing medium is a 0.3mm stainless steel needle, W3.5 fine-grained polishing paste, deionized water is used as the polishing fluid, the mass ratio of steel needle, workpiece and polishing paste is 8:1:0.03, the polishing power is 500W, the magnetic field strength is 0.30T, the polishing time is 20min, and the rotation speed is 1400r / min. Subsequently, the base plate 1 is ultrasonically cleaned with a mixed solution of acetone and anhydrous ethanol, wherein the volume ratio of acetone to anhydrous ethanol is 1:1, the ultrasonic power is 350W, and the ultrasonic cleaning time is 20min.

[0071] Pre-treatment of several nozzles 2: The nozzles 2 were placed on the vibration testing machine platform for grinding and polishing. The specific parameters were as follows: the polishing medium was 2.5mm ZrO2 balls, W3.5 fine-grained polishing paste, and deionized water was used as the polishing liquid. The mass ratio of ZrO2, workpiece and polishing paste was 4:1:0.03. The no-load amplitude of the vibration machine was 2.5mm. The polishing time was 20min. Subsequently, the base plate 1 was ultrasonically cleaned with a mixed solution of acetone and anhydrous ethanol. The volume ratio of acetone to anhydrous ethanol was 1:1. The ultrasonic power was 300W. The ultrasonic cleaning time was 10min.

[0072] An automatic nozzle assembly device is used to fit and position the pre-treated nozzles 2 one-to-one with the mounting holes 11 opened on the base plate 1 to obtain the nozzle plate assembly.

[0073] S3. The nozzle plate assembly prepared in S2 is placed into a vacuum diffusion welding furnace, and the vacuum level inside the furnace is evacuated to 8.0 × 10⁻⁶. -3 Pa, the furnace temperature was raised to 1700℃ at a uniform heating rate of 14℃ / min, held for 60min, and then the furnace temperature was lowered to below 500℃ at a cooling rate of 6℃ / min. The furnace was then cooled to room temperature to obtain the crude nozzle plate.

[0074] S4. Perform a shaping process on the bottom plate 1 in the rough product of the nozzle plate obtained in S3;

[0075] S5. The rough nozzle plate after S4 calibration is automatically laser-welded using a fiber laser welding machine. The specific parameters are: laser wavelength 1030nm; laser power 900W; welding speed 2.0m / min; pulse width 17ms; shielding gas is high-purity argon with a purity ≥99.999% and a flow rate of 15L / min; the weld width of the laser-automatic re-welding is 1.0mm.

[0076] S6. Use penetrating fluid to test the weld for leakage. After the test is successful, the finished platinum nozzle plate is obtained.

[0077] Comparative Example 1

[0078] Compared with Example 1, the difference is that step S5 is not performed, while the other steps are the same.

[0079] Comparative Example 2

[0080] Compared with Example 1, in step S1, the leak nozzle 2 is made of a platinum-based material without oxide dispersion phase, and after step S2 is completed, steps S3 and S4 are not performed, but step S5 is performed directly, and the remaining steps are the same.

[0081] Comparative Example 3

[0082] Compared with Example 4, in step S1, the leak nozzle 2 is made of a platinum-based material without oxide dispersion phase, and the outer diameter of the straight pipe section of the leak nozzle 2 is the same as the diameter of the mounting hole 11. The remaining steps are the same.

[0083] The nozzle plates prepared in Examples 1-4 and Comparative Examples 1-3 were applied to production for performance verification. The specific results are shown in the table below.

[0084]

[0085] As can be seen from the table above, firstly, all embodiments exhibit excellent welding quality: except for Embodiment 2, which had one leaking nozzle 2 during operation, the other embodiments did not have any leaking nozzle 2 after welding or during operation, indicating that the "interference fit + vacuum diffusion welding + laser automatic re-welding" process route adopted is stable and reliable.

[0086] Second, the materials are reasonably selected: both the base plate 1 and the leak nozzle 2 are made of platinum-based materials containing oxide dispersion phases, and the rhodium content is between 0 and 20 wt%, which effectively improves the high temperature strength, creep resistance and oxidation volatilization resistance of the leak nozzle 2.

[0087] Third, thorough pretreatment: magnetic polishing combined with vibratory grinding and ultrasonic cleaning effectively removes the surface oxide layer and contaminants, providing a clean and activated interface for diffusion welding and ensuring the metallurgical bonding quality of the welding interface.

[0088] Fourth, the diffusion welding process is well-matched: Different embodiments adjusted the welding temperature (1350~1700℃), holding time (60~120 min), and vacuum degree (2.0×10⁻⁶) according to the material composition (e.g., rhodium content) and structural dimensions. -2 ~8.0×10 -3 Pa) achieves good interface diffusion and integration.

[0089] Fifth, laser re-welding further strengthens the weld: Laser automatic re-welding is performed on the basis of diffusion welding, forming a secondary metallurgical bond, which significantly improves the sealing performance and structural strength of the weld.

[0090] As can be seen from the comparison between Comparative Example 1 and Example 1, vacuum diffusion welding alone cannot guarantee a long-term reliable connection between a large number of high-density nozzles 2 and the base plate 1, indicating that automatic laser re-welding is a key process to ensure the reliability of the connection between the nozzles 2 and the base plate 1.

[0091] As can be seen from Comparative Example 2 compared with Example 1, the leak nozzle 2 is made of a platinum-based material without oxide dispersion phase, which results in insufficient high-temperature strength and a significant decrease in wear resistance and oxidation volatilization resistance. Furthermore, the subsequent connection is only achieved by automatic laser re-welding, which cannot achieve a complete metallurgical bond between the leak nozzle 2 and the mounting hole 11 of the base plate 1. The interface connection strength is insufficient, which leads to leakage of the leak nozzle 2.

[0092] As can be seen from the comparison between Comparative Example 3 and Example 4, the defect of the leak nozzle 2 in Comparative Example 3 is the same as that in Comparative Example 2. However, the subsequent assembly does not use interference fit, resulting in no preload in the initial assembly and poor interface contact. Even if vacuum diffusion welding and laser automatic re-welding are performed later, effective full metallurgical bonding cannot be achieved, causing the leak nozzle 2 to leak.

[0093] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A manufacturing process for a platinum nozzle plate, characterized in that, Includes the following steps: S1. Select a platinum-based material with low oxide dispersion phase to make a base plate (1), and process several mounting holes (11) on the base plate (1). Select a platinum-based material with high oxide dispersion phase to make several leak nozzles (2). S2. After pre-treating the base plate (1) and several nozzles (2) prepared in S1, the several nozzles (2) are press-fitted one-to-one with the several mounting holes (11) on the base plate (1) to obtain the nozzle plate assembly. S3. Vacuum diffusion welding is performed on the nozzle plate assembly obtained in S2 to weld and fix each nozzle (2) to the corresponding mounting hole (11) on the base plate (1) to obtain a rough nozzle plate. S4. The bottom plate (1) in the rough product of the nozzle plate obtained in S3 is subjected to a shaping process; S5. The rough nozzle plate after S4 calibration is automatically laser-welded. After the welding is completed, a leakage test is performed. If the test is successful, the finished platinum nozzle plate is obtained.

2. The manufacturing process of a platinum nozzle plate according to claim 1, characterized in that, In step S1, the content of oxide dispersed phase in the platinum-based material with low oxide dispersed phase is 0.02~0.35wt%, the content of oxide dispersed phase in the platinum-based material with high oxide dispersed phase is 0.35~1.0wt%, and the rhodium content in both platinum-based materials is 0~20wt%.

3. The manufacturing process of a platinum nozzle plate according to claim 1, characterized in that, In step S1, one end of the leak nozzle (2) is a straight pipe section and the other end is a tapered pipe section. The straight pipe section of the leak nozzle (2) is used to make an interference fit with the corresponding mounting hole (11). The length of the straight pipe section of the leak nozzle (2) is the same as the thickness of the base plate (1). The outer diameter of the straight pipe section of the leak nozzle (2) is 0.01~0.02mm larger than the diameter of the mounting hole (11).

4. The manufacturing process of a platinum nozzle plate according to claim 1, characterized in that, In step S2, the pretreatment method is as follows: the base plate (1) is placed in a magnetic polishing machine for grinding and polishing, the nozzle (2) is placed on a vibration testing machine platform for grinding and polishing, and then the treated base plate (1) and nozzle (2) are chemically purified respectively.

5. The manufacturing process of a platinum nozzle plate according to claim 4, characterized in that, The specific parameters for the grinding and polishing treatment of the base plate (1) are as follows: the polishing medium is a 0.2~0.5mm fine-diameter stainless steel needle, paired with W3.5~W5 fine-grained grinding paste, the mass ratio of stainless steel needle, workpiece and grinding paste is controlled at 8:1:0.03, the polishing liquid is deionized water, the power of the polishing equipment is set to 300~500W, the magnetic field strength is adjusted to 0.15~0.3T, the polishing time is 20~30min, and the polishing speed is controlled at 1000~1500r / min.

6. The manufacturing process of a platinum nozzle plate according to claim 4, characterized in that, The specific parameters for grinding and polishing the leak nozzle (2) are as follows: the polishing medium is ZrO2 balls with a diameter of 2.0~3.0mm, and is paired with W3.5~W5 fine-grained polishing paste. The mass ratio of ZrO2, workpiece and polishing paste is controlled at 4:1:0.

03. The polishing liquid is deionized water. The vibration test machine has an adjustable amplitude of 0~5mm under no-load conditions. The vibration time is 10~20min for polishing.

7. The manufacturing process of a platinum nozzle plate according to claim 4, characterized in that, The specific operation of chemical purification is as follows: the base plate (1) and the nozzle (2) are ultrasonically cleaned with a mixed solution of acetone and anhydrous ethanol, wherein the volume ratio of acetone to anhydrous ethanol is 1:1, the ultrasonic power is 200~300W, and the ultrasonic cleaning time is 15~20min.

8. The manufacturing process of a platinum nozzle plate according to claim 1, characterized in that, In step S3, the specific operation of vacuum diffusion welding is as follows: the nozzle plate assembly is sent into the vacuum diffusion welding furnace, and the vacuum degree inside the furnace is evacuated to ≤2×10. -2 Pa, with a uniform heating rate of 10~15℃ / min, the furnace temperature is raised to 1240~1750℃, held for 60~120min, and then the furnace temperature is reduced to below 500℃ at a cooling rate of 5~10℃ / min. Subsequently, the furnace is cooled to room temperature. The welding depth of vacuum diffusion welding is 1.3~2.0mm.

9. The manufacturing process of a platinum nozzle plate according to claim 1, characterized in that, In step S5, a fiber laser welding machine is used for automatic laser re-welding. The laser wavelength is 1030nm, the laser power is 700~900W, the welding speed is 0.5~2.0m / min, the pulse width is 10~20ms, the shielding gas is high-purity argon with a purity ≥99.999%, and the gas flow rate is 10~20L / min. The weld width of the automatic laser re-welding is controlled between 0.8~1.5mm, and the welding depth is 1~2mm.

10. The manufacturing process of a platinum nozzle plate according to claim 1, characterized in that, In step S5, a permeate solution is used for leakage detection.

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