Iridium source filament and preparation method thereof

Abstract

The invention discloses an iridium source filament in the field of filament preparation and a preparation method thereof, including welding the filament to a bracket using a welding machine; the filament is sequentially subjected to pickling treatment, alcohol washing treatment, and water washing treatment, and placed in an oven for drying for standby use; yttrium oxide composite slurry is applied to the surface of the filament, and the coating thickness is 50-80 μm; the oven is preheated to 120-150° C. in advance, and the filament prepared in step S3 is placed in an oven for drying treatment for 1.5-3 hours to obtain an iridium source filament. The present invention provides a stable coating system by mixing yttrium oxide nanopowder with yttrium sol, using nanoparticles with different particle sizes and powder morphologies, and applying it on the surface of the iridium wire to form a filament, which can increase the service life of the filament.

Description

Technical Field

[0001] The invention belongs to the technical field of filament preparation, and specifically relates to an iridium source filament and a preparation method thereof. Background Art

[0002] A mass spectrometer can analyze the composition and structure of a substance by measuring its mass-to-charge ratio. Its main working principle is to ionize the sample to be tested into charged ions, and produce temporal and spatial separation under the action of an electric field or a magnetic field, so as to perform qualitative or quantitative analysis on the ions. A mass spectrometer generally consists of an injection system, an ion source, a mass analyzer, a detector, and a data analysis system. The ion source is the core component of the mass spectrometer, which can emit ion beams and use ion beams with different mass-to-charge ratios to strip off the outer electrons of atoms, thereby forming charged ions. Types of mass spectrometry ion sources include electron bombardment sources, chemical ionization sources, electrospray ionization sources, and inductively coupled plasma ion sources. Among them, electron bombardment sources are the most widely used. They form an electron beam between the filament and the receiving electrode to electrically charge the sample. Ion; The filament of the mass spectrometer ion source can generate an ion source under a high vacuum environment. It is a key component in the mass spectrometer and has a direct impact on the sensitivity, accuracy and resolution of the mass spectrometer. The filament is usually a metal wire, such as metal rhenium, metal iridium, metal tungsten, etc. It needs to have high temperature stability, electrical conductivity, high melting point and good mechanical properties. Using a single metal as a filament is difficult to meet multiple requirements. Metal rhenium has two properties, but the resources of metals are scarce and the cost component is high. Metal tungsten has a high melting point and good high temperature stability, but the vapor pressure of tungsten metal is also high, which has a certain impact on the accuracy of the mass spectrometer. Although metal molybdenum and metal titanium have good electrical conductivity and thermal stability, their thermal expansion coefficients are large and they are prone to deformation in high temperature environments. Summary of the invention

[0003] In view of the above situation, in order to overcome the defects of the prior art, the present invention provides an iridium source filament and a preparation method thereof. By mixing yttrium oxide nanopowder with yttrium sol, a stable coating system is provided with nanoparticles with different particle sizes and powder morphologies, which are coated on the surface of the iridium wire to make a filament, thereby increasing the service life of the filament.

[0004] In order to achieve the above object, the technical solution adopted by the present invention is as follows: The present invention proposes a method for preparing an iridium source filament, which specifically comprises the following steps:

[0005] S1. Use a welding machine to weld the filament to the bracket;

[0006] S2, sequentially performing acid washing, alcohol washing, and water washing on the filament, placing the filament in an oven for drying, and setting aside;

[0007] S3, coating the yttrium oxide composite slurry on the surface of the filament, with a coating thickness of 50-80 μm;

[0008] S4, preheating the oven to 120-150°C, placing the filament prepared in step S3 in the oven for drying for 1.5-3h to obtain an iridium source filament.

[0009] Preferably, in step S1, the filament raw material is iridium wire, and the diameter of the filament is 0.15-0.25 mm;

[0010] Preferably, in step S1, the welding method is spot welding;

[0011] Preferably, in step S2, the pickling solution for pickling treatment is a sulfuric acid aqueous solution, wherein the mass fraction of sulfuric acid is 5%-20%, and the pickling treatment time is 10-15min;

[0012] Preferably, in step S2, the alcohol washing liquid in the alcohol washing treatment is anhydrous ethanol, and the alcohol washing time is 20-30 minutes;

[0013] Preferably, in step S2, the water washing treatment time is 10-15 minutes;

[0014] Preferably, in step S3, the method for preparing the yttrium oxide composite slurry specifically comprises the following steps:

[0015] S31, dissolving oxalic acid and polyacrylic acid with deionized water, placing on a magnetic stirrer for mixing, heating to 40-50° C., adding yttrium nitrate hexahydrate solution, stirring at 200-300 rpm for 30-60 min, standing for 2-3 h, centrifuging at 4000-5000 rpm for 10-15 min, discarding the supernatant, collecting the precipitate, washing, filtering, placing in a vacuum drying oven for drying, and grinding to obtain yttrium oxide precursor powder;

[0016] Preferably, in step S31, the mass ratio between the oxalic acid and the polyacrylic acid is 2-3:1;

[0017] Preferably, in step S31, the mass concentration of oxalic acid in deionized water is 2-4 g / L;

[0018] Preferably, in step S31, the molar concentration of the yttrium nitrate hexahydrate solution is 0.1-0.2 mol / L;

[0019] Preferably, in step S31, the mass ratio between the oxalic acid and the yttrium nitrate hexahydrate is 3-4:1;

[0020] S32, placing the yttrium oxide precursor powder prepared in step S31 in a corundum crucible, calcining it in a muffle furnace at 700-900° C. for 2-4 hours, and naturally cooling it to room temperature to obtain yttrium oxide nanopowder;

[0021] S33, dissolving yttrium nitrate hexahydrate in deionized water, adding citric acid, mixing evenly, adding urea, stirring to a uniform system, adjusting the pH to 7 with aqueous ammonia, raising the temperature to 70-80° C., stirring at 300-350 rpm, and after 30-60 min, evaporating and removing excess deionized water to obtain yttrium sol;

[0022] Preferably, in step S33, the molar concentration of the yttrium nitrate hexahydrate in deionized water is 0.2-0.4 mol / L;

[0023] Preferably, in step S33, the molar ratio between the citric acid and the yttrium nitrate hexahydrate is 1:1.5-2;

[0024] Preferably, in step S33, the mass of urea added is 0.5-1% of the mass of yttrium nitrate hexahydrate;

[0025] S34, mixing the yttrium oxide nanopowder prepared in step S32 and the yttrium sol prepared in step S33, stirring in a homogenizer at 15000-20000 rpm to obtain an yttrium oxide composite slurry;

[0026] Preferably, in step S34, the mass ratio between the yttrium oxide nanopowder and the yttrium sol is 1:0.9-1.1;

[0027] The present invention also provides an iridium source filament prepared according to the above method, wherein the lamp holder A is arranged through the top of the lamp holder fixing plate, the lamp holder B is arranged through the top of the lamp holder fixing plate, one end of the filament is connected to the lamp holder A, and the other end of the filament is connected to the lamp holder B.

[0028] The beneficial effects achieved by the present invention are as follows:

[0029] The invention provides an iridium source filament and a preparation method thereof. Yttrium oxide nanopowder is mixed with yttrium sol to form a filament with nanoparticles of different particle sizes and powder morphologies, thereby providing a stable coating system, which is coated on the surface of the iridium wire to form a filament, thereby improving the service life of the filament. In the invention, polyacrylic acid is added as a stabilizer to the yttrium oxide precursor solution. The molecular structure of polyacrylic acid has both hydrophilic groups and hydrophobic groups. Yttrium oxide nanoparticles have high surface energy and can be adsorbed on the surface of polyacrylic acid to inhibit the growth of crystal nuclei and provide a steric hindrance effect. , effectively preventing the agglomeration of nanoparticles and forming yttrium oxide nanoparticles with multi-angular shapes; citric acid is used as a complexing agent in the yttrium sol, and the polyvalent carboxyl structure of citric acid presents multi-level ionization. After the carboxyl anions and yttrium ions are coordinated, a stable gel system is formed; after the yttrium sol and yttrium oxide nanopowder are mixed, they are coated on the surface of the filament. The particles in the yttrium sol are mainly spherical particles, and the yttrium oxide nanopowder is mainly multi-angular structure, which can effectively reduce the contact area between yttrium oxide nanoparticles and avoid the occurrence of agglomeration, thereby increasing the life of the filament. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a schematic diagram of the assembly structure of the iridium source filament and the lamp holder in Example 1 of the present invention;

[0031] Figure 2 The SEM images of yttrium oxide nanopowders prepared in Example 1 and Comparative Example 2;

[0032] Figure 3 The SEM images of the surfaces of the iridium source filaments prepared in Example 1 and Comparative Example 1;

[0033] Figure 4 This is a cross-sectional SEM image of the iridium source filament prepared in Example 1;

[0034] Among them, 1. filament, 2. lamp stand A, 3. lamp stand fixing plate, 4. lamp stand B.

[0035] The accompanying drawings are used to provide further understanding of the present invention and constitute a part of the specification. They are used to explain the present invention together with the embodiments of the present invention and do not constitute a limitation of the present invention. DETAILED DESCRIPTION

[0036] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments; based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0037] Unless otherwise defined, all professional and scientific terms used herein have the same meanings as those familiar to those skilled in the art. In addition, any methods and materials similar or equivalent to those described herein may be applied to the present invention. The preferred implementation methods and materials described herein are for demonstration purposes only and are not intended to limit the content of this application.

[0038] The experimental methods in the following examples are conventional methods unless otherwise specified; the experimental materials and test strains used in the following examples are purchased from commercial channels unless otherwise specified.

[0039] Example 1

[0040] This embodiment provides a method for preparing an iridium source filament, which specifically includes the following steps:

[0041] S1. Place an iridium wire with a diameter of 0.15 mm as a filament on a lamp holder, fix one end of the filament with a clamp, and use a spot welder to weld the other end of the filament to the lamp holder. Then, remove the clamp and weld the rest of the lamp holder into shape.

[0042] S2, immersing the filament welded in step S1 in a 10wt% sulfuric acid aqueous solution for pickling for 10 min, transferring it to anhydrous ethanol, ultrasonically treating it at a power of 400 W, after 20 min, placing it in deionized water for ultrasonic treatment for 15 min, and drying it in an oven for standby use;

[0043] S3, adding yttrium oxide composite slurry into the sprayer, fixing the lamp holder, and spraying the yttrium oxide composite slurry on the filament, with a coating thickness of 50 μm;

[0044] S31. Accurately weigh 4 g of oxalic acid and 2 g of polyacrylic acid and place them in a beaker. Add 1000 mL of deionized water to the beaker, stir with a glass rod until the oxalic acid and polyacrylic acid are completely dissolved, place on a magnetic stirrer, stir at 300 rpm, raise the temperature to 40°C, accurately weigh 7.66 g of yttrium nitrate hexahydrate and dissolve in 100 mL of deionized water, take 13 mL and add to the mixed solution of oxalic acid and polyacrylic acid, react for 45 min, let stand for 2 h at room temperature, centrifuge at 4000 rpm for 15 min, remove the supernatant, wash the precipitate three times with deionized water and anhydrous ethanol respectively, filter, dry the solid in a vacuum drying oven at 80°C, and grind to obtain yttrium oxide precursor powder;

[0045] S32, placing the yttrium oxide precursor powder prepared in step S31 in a corundum crucible, heating to 700° C. at a rate of 5° C. / min for calcination for 3 hours, and cooling naturally to room temperature after calcination to obtain yttrium oxide nanopowder;

[0046] S33, accurately weigh 7.66 g of yttrium nitrate hexahydrate and dissolve it in 50 mL of deionized water, add 5.76 g of citric acid, mix well, add 0.038 g of urea, stir and mix at a speed of 300 rpm, after mixing well, add ammonia water dropwise to adjust the pH of the reaction system to 7, increase the reaction temperature to 80° C., react for 45 min, evaporate excess deionized water, and obtain yttrium sol:

[0047] S34, mixing 2 g of the yttrium oxide nanopowder prepared in step S32 with 2 g of the yttrium sol prepared in step S33, stirring in a homogenizer at 15000 rpm to obtain an yttrium oxide composite slurry;

[0048] S4, preheating the oven to 150°C, placing the filament prepared in step S3 in the oven for drying for 2 hours to obtain an iridium source filament.

[0049] This embodiment also provides an iridium source filament prepared according to the above preparation method, wherein the assembly structure of the filament and the lamp holder is as follows: Figure 1 As shown, the lamp holder A2 and the lamp holder B4 penetrate the lamp holder fixing plate 3, one end of the filament 1 is connected to the lamp holder A2, and the other end of the filament 1 is connected to the lamp holder B4.

[0050] Example 2

[0051] This embodiment provides a method for preparing an iridium source filament, which specifically includes the following steps:

[0052] S1. Place an iridium wire with a diameter of 0.20 mm as a filament on a lamp holder, fix one end of the filament with a clamp, and use a spot welder to weld the other end of the filament to the lamp holder. Then, remove the clamp and weld the rest of the lamp holder into shape.

[0053] S2, immersing the filament after welding in step S1 in a 5wt% sulfuric acid aqueous solution for pickling for 15 min, transferring it to anhydrous ethanol, ultrasonically treating it at a power of 400 W, after 30 min, placing it in deionized water for ultrasonic treatment for 10 min, placing it in an oven for drying, and setting it aside;

[0054] S3, adding yttrium oxide composite slurry into the sprayer, fixing the lamp holder, and spraying the yttrium oxide composite slurry on the filament, with a coating thickness of 80 μm;

[0055] S31. Accurately weigh 3 g of oxalic acid and 1 g of polyacrylic acid and place them in a beaker. Add 1000 mL of deionized water to the beaker, stir with a glass rod until the oxalic acid and polyacrylic acid are completely dissolved, place on a magnetic stirrer, stir at 250 rpm, raise the temperature to 40°C, accurately weigh 3.83 g of yttrium nitrate hexahydrate and dissolve in 100 mL of deionized water, take 26 mL and add it to the mixed solution of oxalic acid and polyacrylic acid, react for 60 min, let stand for 3 h at room temperature, centrifuge at 5000 rpm for 10 min, remove the supernatant, wash the precipitate three times with deionized water and anhydrous ethanol respectively, filter, dry the solid matter in a vacuum drying oven at 80°C, and grind to obtain yttrium oxide precursor powder;

[0056] S32, placing the yttrium oxide precursor powder prepared in step S31 in a corundum crucible, heating it to 900° C. at a rate of 5° C. / min for calcination for 2 hours, and cooling it naturally to room temperature after calcination to obtain yttrium oxide nanopowder;

[0057] S33, accurately weigh 3.83 g of yttrium nitrate hexahydrate and dissolve it in 50 mL of deionized water, add 3.84 g of citric acid, mix well, add 0.038 g of urea, stir and mix at 350 rpm, after mixing well, add ammonia water dropwise to adjust the pH of the reaction system to 7, increase the reaction temperature to 80° C., react for 30 min, evaporate excess deionized water, and obtain yttrium sol:

[0058] S34, mixing 2 g of the yttrium oxide nanopowder prepared in step S32 with 1.8 g of the yttrium sol prepared in step S33, stirring in a homogenizer at 20,000 rpm to obtain an yttrium oxide composite slurry;

[0059] S4, preheating the oven to 120°C, placing the filament prepared in step S3 in the oven for drying for 3 hours to obtain an iridium source filament.

[0060] This embodiment also provides an iridium source filament prepared according to the above preparation method.

[0061] Example 3

[0062] This embodiment provides a method for preparing an iridium source filament, which specifically includes the following steps:

[0063] S1. Place an iridium wire with a diameter of 0.25 mm as a filament on a lamp holder, fix one end of the filament with a clamp, and use a spot welder to weld the other end of the filament to the lamp holder. Then, remove the clamp and weld the rest of the lamp holder into shape.

[0064] S2, immersing the filament welded in step S1 in a 20wt% sulfuric acid aqueous solution for pickling for 10 min, transferring it to anhydrous ethanol, ultrasonically treating it at a power of 400 W, after 20 min, placing it in deionized water for ultrasonic treatment for 10 min, and drying it in an oven for standby use;

[0065] S3, adding yttrium oxide composite slurry into the sprayer, fixing the lamp holder, and spraying the yttrium oxide composite slurry on the filament, with a coating thickness of 50 μm;

[0066] S31. Accurately weigh 4 g of oxalic acid and 2 g of polyacrylic acid and place them in a beaker. Add 500 mL of deionized water to the beaker, stir with a glass rod until the oxalic acid and polyacrylic acid are completely dissolved, place on a magnetic stirrer, stir at 200 rpm, raise the temperature to 40°C, accurately weigh 3.83 g of yttrium nitrate hexahydrate and dissolve in 100 mL of deionized water, take 12 mL and add it to the mixed solution of oxalic acid and polyacrylic acid, react for 30 min, let stand for 3 h at room temperature, centrifuge at 5000 rpm for 10 min, remove the supernatant, wash the precipitate three times with deionized water and anhydrous ethanol respectively, filter, dry the solid in a vacuum drying oven at 80°C, and grind to obtain yttrium oxide precursor powder;

[0067] S32, placing the yttrium oxide precursor powder prepared in step S31 in a corundum crucible, heating it to 800° C. at a rate of 5° C. / min for calcination for 4 hours, and naturally cooling it to room temperature after calcination to obtain yttrium oxide nanopowder;

[0068] S33, accurately weigh 3.83 g of yttrium nitrate hexahydrate and dissolve it in 50 mL of deionized water, add 3.84 g of citric acid, mix well, add 0.038 g of urea, stir and mix at 350 rpm, after mixing well, add ammonia water dropwise to adjust the pH of the reaction system to 7, increase the reaction temperature to 80° C., react for 60 min, evaporate excess deionized water, and obtain yttrium sol:

[0069] S34, mixing 1 g of the yttrium oxide nanopowder prepared in step S32 with 1.1 g of the yttrium sol prepared in step S33, stirring in a homogenizer at 20,000 rpm to obtain an yttrium oxide composite slurry;

[0070] S4, preheating the oven to 120°C, placing the filament prepared in step S3 in the oven for drying for 3 hours to obtain an iridium source filament.

[0071] This embodiment also provides an iridium source filament prepared according to the above preparation method.

[0072] Comparative Example 1

[0073] This comparative example provides an iridium source filament and a preparation method thereof, which differs from Example 1 only in that the preparation method of the iridium source filament does not include steps S1 and S2, and actually uses yttrium sol as a coating to coat the iridium wire, and the remaining components and component contents are the same as those in Example 1.

[0074] Comparative Example 2

[0075] This comparative example provides an iridium source filament and a preparation method thereof, which differs from Example 1 only in that step S1 of the preparation method of the iridium source filament does not contain polyacrylic acid, and the remaining components and component contents are the same as those in Example 1.

[0076] Experimental Example 1

[0077] This experimental example analyzes the powder morphology of the yttrium oxide nanopowder prepared in step S32 mentioned in Example 1 and the yttrium oxide nanopowder prepared in Comparative Example 2, and observes the morphology of the above two yttrium oxide nanopowders by using an S-4800 field scanning electron microscope;

[0078] Figure 2 The SEM images of the yttrium oxide nanopowders prepared in Example 1 and Comparative Example 2 are shown in FIG. A is the yttrium oxide nanopowder prepared in Example 1, Figure 2 The yttrium oxide nanopowder prepared in Comparative Example 2, according to image analysis, the powder shape of the yttrium oxide nanopowder prepared in Example 1 presents a multi-angular structure, with high dispersibility, while the yttrium oxide nanopowder prepared in Comparative Example 2 is spherical, with poor powder dispersibility and serious agglomeration.

[0079] Experimental Example 2

[0080] In this experimental example, the cross-section of the iridium source filament prepared in Example 1 and Comparative Example 1 was observed for microstructure. As in Experimental Example 1, the observation was performed using a S-4800 field scanning electron microscope;

[0081] Figure 3 The SEM images of the surfaces of the iridium source filaments prepared in Example 1 and Comparative Example 1, wherein A is the SEM image of the surface of the iridium source filament prepared in Example 1, and B is the SEM image of the surface of the iridium source filament prepared in Comparative Example 2. As shown in the figure, it can be clearly seen that the surface coating of the iridium source filament prepared in Example 1 is smoother, while the surface of the iridium source filament prepared in Comparative Example 1 has obvious bumps and a rough surface, which is easy to adsorb corrosive substances, resulting in a reduction in the service life of the filament.

[0082] Figure 4 This is a cross-sectional SEM image of the iridium source filament prepared in Example 1. As shown in the figure, the yttrium oxide composite slurry forms a coating structure on the surface of the iridium filament, and has a high degree of bonding with the collection point of the iridium filament.

[0083] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

[0084] The present invention and its implementation methods are described above, which is not restrictive. The drawings are only one of the implementation methods of the present invention, and the actual application is not limited thereto. In short, if ordinary technicians in the field are inspired by it and design methods and embodiments similar to the technical solution without creativity without departing from the purpose of the invention, they should all fall within the protection scope of the present invention.

Claims

1. A method for preparing an iridium source filament, characterized in that: The specific steps include: S1. Use a welding machine to weld the filament to the bracket; S2, sequentially performing acid washing, alcohol washing, and water washing on the filament, placing the filament in an oven for drying, and setting aside; S3, coating the yttrium oxide composite slurry on the surface of the filament, with a coating thickness of 50-80 μm; S31, dissolving oxalic acid and polyacrylic acid in deionized water, the mass ratio of oxalic acid to polyacrylic acid being 2-3:1, placing on a magnetic stirrer for mixing, heating to 40-50°C, adding yttrium nitrate hexahydrate solution, the molar concentration of yttrium nitrate hexahydrate solution being 0.1-0.2 mol / L, stirring at 200-300 rpm for 30-60 min, standing for 2-3 h, centrifuging at 4000-5000 rpm for 10-15 min, discarding the supernatant, collecting the precipitate, washing, filtering, placing in a vacuum drying oven for drying, and grinding to obtain yttrium oxide precursor powder; S32, placing the yttrium oxide precursor powder prepared in step S31 in a corundum crucible, calcining it in a muffle furnace at 700-900° C. for 2-4 hours, and naturally cooling it to room temperature to obtain yttrium oxide nanopowder; S33, dissolving yttrium nitrate hexahydrate in deionized water, wherein the molar concentration of yttrium nitrate hexahydrate in deionized water is 0.2-0.4 mol / L, adding citric acid, wherein the molar ratio of citric acid to yttrium nitrate hexahydrate is 1:1.5-2, and after mixing evenly, adding urea, stirring to a uniform system, adjusting the pH to 7 with aqueous ammonia, raising the temperature to 70-80° C., stirring at a speed of 300-350 rpm, and after 30-60 min, evaporating and removing excess deionized water to obtain yttrium sol; S34, mixing the yttrium oxide nanopowder prepared in step S32 and the yttrium sol prepared in step S33, stirring in a homogenizer at 15000-20000 rpm to obtain an yttrium oxide composite slurry; S4, preheating the oven to 120-150°C, placing the filament prepared in step S3 in the oven for drying for 1.5-3h to obtain an iridium source filament.

2. The method for preparing an iridium source filament according to claim 1, characterized in that: In step S1, the filament material is iridium wire, and the diameter of the filament is 0.15-0.25 mm; the welding method is spot welding.

3. The method for preparing an iridium source filament according to claim 2, characterized in that: In step S2, the pickling solution of the pickling treatment is a sulfuric acid aqueous solution, wherein the mass fraction of sulfuric acid is 5%-20%, and the pickling treatment time is 10-15 minutes; the alcohol washing solution of the alcohol washing treatment is anhydrous ethanol, and the alcohol washing time is 20-30 minutes; the water washing treatment time is 10-15 minutes.

4. The method for preparing an iridium source filament according to claim 3, characterized in that: In step S31, the mass concentration of oxalic acid in deionized water is 2-4 g / L; the mass ratio of oxalic acid to yttrium nitrate hexahydrate is 3-4:

1.

5. The method for preparing an iridium source filament according to claim 4, characterized in that: In step S33, the mass of urea added is 0.5-1% of the mass of yttrium nitrate hexahydrate.

6. The method for preparing an iridium source filament according to claim 5, characterized in that: In step S34, the mass ratio of the yttrium oxide nanopowder to the yttrium sol is 1:0.9-1.

1.

7. An iridium source filament, characterized in that: According to the preparation method according to any one of claims 1 to 6, one end of the filament (1) is connected to the lamp holder A (2), and the other end of the filament (1) is connected to the lamp holder B (4), the lamp holder A (2) is penetrated through the top of the lamp holder fixing plate (3), and the lamp holder B (4) is penetrated through the top of the lamp holder fixing plate (3).

Images