KR890004833B1 - Method of making heater in crt - Google Patents

Abstract

The heater of CRT electron gun is manufactured by steps of : a) winding Mo coil around W core; b) baking the core at 1350≰C under wet H2 atmosphere to improve the plasticity ; c) cutting the core with one unit; d) forming the core to be arranged that the both input taps are in parallel such that the heater is inserted into the cylindrical inline cathode easily ; e) electrostatic coating the heater in the alumina solution to form a first insulation layer ; f) drying the heater with hot air of 150-250≰C to vaporise the solution ; g) coating the heater again ; h) blackening the heater to form a blackened layer ; i) sintering at 1600≰C ;and j) dissolving and removing the Mo wire.

Description

Manufacturing method of electron gun heater of water pipe

1 (a) to 1 (g) are manufacturing process diagrams of a heater for an electron gun of a conventional water tube.

2 (a) to 2 (n) are manufacturing process diagrams of the heater of the electron gun of the water pipe according to the present invention.

* Explanation of symbols for main parts of the drawings

1: heater material 2: molybdenum wire

3: tungsten wire 4: input part

5: heating part 6: welding part

7: primary insulating film 8: secondary insulating film

9: blackening film 10: wet hydrogen

15: solution 16: infrared lamp

18: hot air dryer 23: tungsten mesh boat

24: plastic tank 25: funnel

27: discharge hose

The present invention relates to a method for narrowing a heater for an electron gun used in a water tube of a television receiver or a monitor.

In general, the electron gun of the water tube is equipped with a heater for heating the cathode. The heater is inserted into the inline heating type cathode and reaches about 800 ° C. after about 2-3 seconds after the rated voltage is applied, and about 6-8 seconds have elapsed. In this case, the cathode emits high heat to emit electrons from the electron-emitting material of the cathode, and it is composed of a heating part that generates heat, an input part that serves as a support and power supply for the heating part, and a welding part that is not coated with alumina particles. It is about 2mg and its total weight is only about 7mg, so it is very small and requires careful attention to its manufacturing process.

In manufacturing a heater for an electron gun of a conventional water tube, it is manufactured through many processes as follows.

1st process: Single coil winding process

The tungsten wire 3 having a diameter of 0.025-0.044 mm, which is a hot wire, is formed so that the input portion 4 and the heat generating portion 5 are alternately formed around the molybdenum wire 2 having a diameter of 0.125 mm, which is a mandrel wire, as shown in FIG. The coil is wound to obtain the heater material 1.

The input part 4 and the heat generating part 5 are wound with a constant pitch and a winding length.

Second Step: Baking Process

In order to maintain the pitch of the single coil wound in the first step, the baking of the raw material 1 is increased by baking at 1350 ° C. with the wet hydrogen 10 as shown in the first (b).

3rd process: cutting process

As the optical automatic cutting machine, the raw material 1 is cut in the state in which the input unit 4 is connected to the length of one heater, that is, both sides of the heat generating unit 5 as shown in FIG. 1 (c).

4th process: shaping process

The cut material 1 is folded at the center of the heat generating part 5 so as to be easily inserted into the cylindrical inline heat dissipating negative electrode as shown in FIG. 1 (d), so that both input parts 4 are formed side by side.

5th process: 1st alignment process

30 pieces of the shaped materials 1 are arranged on the alignment table 11 as shown in FIG. 1 (e) for improving work efficiency and quality control.

6th process: 1st electrodeposition process

The primary raw insulating film 7 is formed on the heat generating part 5 and the input part 4 as shown in FIG. The weld 6 extending from does not electrodeposit.

7th process: 2nd alignment process

The electrodeposited material 1 is aligned and stored in the boat 12 made of molybdenum plate as shown in FIG. 1 (g).

8th process: 1st sintering process

The raw material 1 aligned with the boat 12 is first sintered in a dry hydrogen atmosphere (13) at 1600 ° C. as in the first (h) degree.

Here, the primary electrodeposition and the primary sintering process are for maintaining the shape and insulation of the tungsten wire (3), and the welding portion (6) should not be insulated, so that only the heat generating portion (5) and the input portion (4) except the portion are electrodeposited. To sinter.

Step 9: molybdenum dissolving process

Molybdenum wire, which is a mandrel wire, is taken out of the boat 12 and the primary tank and the sintered raw material 1 are put in a solution 15, which is a mixed solution of mixed acid and oxidant injected into the glass beaker 14 as shown in FIG. 1 (i). (2) is dissolved and removed.

Here, the molybdenum wire 2 is supported internally for the single coil winding of the tungsten wire 3 and its shape maintenance, and is removed because it is not necessary for the completed heater.

The molybdenum wire dissolving solution 15 is a mixture of mixed acid and an oxidizing agent, and dissolves only the molybdenum wire 2 and does not dissolve the primary insulating film 7 and the tungsten wire 3. If the glass beaker (14) 6 is for 1000 ml, inject a solution (15) mixed with 200 ml of mixed acid and 300 ml of oxidant, and immerse 850-1000 primary sintered materials (1), which are 6 parts, into the boat (12). The molten denser 2 is dissolved by leaving the chamber in forced exhaust (ventilation) for 1 hour, and then the beaker 14 is tilted to discharge the solution 15.

Then pour 600ml of cold pure water in a beaker (14) and shake several times to wash and then wash several times.

200 ml of ammonia water in the beaker 14 was poured into the beaker 14, neutralized for 10 minutes, and recovered by ammonia water, washed again with cold pure water four times as described above, repeated several times, Allow to dry for several minutes.

Injecting, discharging, washing, neutralizing, and drying the solution 15 in such a manner several times to completely dissolve and remove the molybdenum wire 2, which is a mendrel wire, to the tungsten wire 3 as shown in FIG. 1 (j). Only the input part 4, the heat generating part 5, and the welding part 6 are left.

The 10th step: modification and sorting process

In the molybdenum wire melting process, the entangled and deformed or the crack in the insulating film 7 is corrected and selected.

Here, the first (j) is also modified and selected as unmodified and modifiable.

Step 11: 3rd alignment

The sorted material 1 is aligned with the alignment table 11 as shown in FIG. 1 (k) to proceed to the next step.

12th process: 2nd electrodeposition process

The secondary insulating film 8 is deposited on the input part 4 and the fume part 5 as the first (l) degree by second electrodeposition of the raw material (1) which has undergone the molybdenum dissolution step in the mixed alumina fine particle liquid having a particle size of 900 and 2000 hours. ) Is not formed on the welded portion 6 even in this step.

Step 13: Insulating Film Drying

The secondary insulating material 8 is dried on the secondary material 1 by the front of the infrared lamp 16 using the clip 17 as shown in the first (m).

Process 14: blackening process

The dried material 1 is immersed in blackening solution for several seconds to blacken to increase radiant heat, thereby forming only blackening 9 as in the first (n).

Process 15: blackening alcohol cleaning process

The blackening film 9 of the blackened material 1 is washed with alcohol as shown in FIG. 1 (o) using a metering pump to manage the degree of blackening treatment.

Step 16: blackening film drying process

The alcohol wash and the raw material 1 are dried for several minutes by the infrared lamp 16 as shown in the first (p).

Process 17: 2nd Sintering Process

The electrodeposited and blackened material 1 was placed in the molybdenum boat 12 as shown in FIG. 1 (q) and subjected to secondary sintering in a dry hydrogen atmosphere at 1600 ° C. to form the secondary insulating film 8 and the blackened film 9. ) To complete the heater.

The completed heater as described above has an external diameter of only 0.32-0.34 mm, and the outer diameter of the smoke part 5 is about 1.2 mm, which is very small and very weak. There are many problems in the conventional manufacturing method as follows. .

That is, in the process of dissolving molybdenum wire (2), which is a mandrel wire, the dissolution liquid (15), cold pure water, ammonia water and hot pure water are discharged and discharged dozens or tens of times, respectively, thereby tangling the materials (1). By virtue of the material 1 being severely deformed and completed, the heater cannot be inserted at the cathode.

When the deformed heater is forcibly pushed to the cathode by welding tooth driving, cracks or breakage of the insulating film occur, and the inside of the cathode and the ring stand line 3 are directly touched by thermal shock and electric shock, thereby causing a critical disconnection of the heater. .

In addition, when the heat generating part 5 and the input part 4 are twisted by 6 ° or more, a normal gap (void) cannot be formed in the inside of the cathode, so that the cathode becomes a heat transfer by conduction rather than a heat transfer amount due to radiation, and the cathode is caused by overheating of the cathode. There is a problem in that the distance between the cathode electron radiation surface and the first electrode is continuously changed to change the characteristics of the electron gun.

In addition, the molybdenum wire 2 is removed after the first strategy and the first sintering process, so that the molybdenum wire 2 is removed and the tungsten wire 4 is formed only by the primary insulating film 7. In the process of completing the remaining steps (8 steps) in the state of maintaining the shape holding power is weak, the shape deformation is additionally issued.

In addition, since the material 1 must be aligned several times with the alignment table 11 and the boat 12 through the previous process, the shape change factor for the material 1 is applied to each process as well as in the above-described melting process. The problem with the change of shape is more serious.

As a result, the number of manufacturing processes is complicated, the productivity is reduced until the heater is completed, and the yield rate of the finished heater by the above-described shape deformation is only 60-70%, resulting in a cost increase.

Therefore, the object of the present invention is to improve the dissolution process which caused the most shape change in the heater material and to consider the alignment process between the sintering process and the dissolution process using tungsten mesh. By reducing the number of processes such as reducing the number of processes, and dissolving molybdenum wire, which is a mandrel wire after the second electrodeposition and blackening treatment, it is possible to minimize the shape deformation factor of the material to minimize the incidence of defective products, and to increase the productivity and cost by simplifying the process. To provide a manufacturing method of the electron gun heater of the award-winning tube.

Hereinafter, a method of manufacturing a heater of the water tube according to the present invention will be described in detail with reference to one embodiment shown in FIGS. 2 (a) to 2 (m).

1st process: Single coil winding process

A tungsten wire 3 having a diameter of 0.025-0.044 mm, which is a hot wire, and a molybdenum wire 2 having a diameter of 0.125 mm, which is a mandrel, have a single coil wound around it, so that the input portion 4 and the heat generating portion 5 The heater material 1 formed alternately is obtained.

The input unit 4 and the heat generating unit 5 are wound with a constant pitch and winding length.

Second Step: Baking Process

In order to maintain the pitch of the input portion 4 and the heat generating portion 5 of the tungsten wire 3 wound by the single coil in the first process, the raw material 1 is wetted with wet hydrogen 10 as shown in FIG. Baking at 1350 ° C. increases the firing of material 1.

3rd process: cutting process

The raw material 1, which has undergone the baking process, is cut with an optical cutter in the state in which the input unit 4 is connected to the length of one heater, that is, both shafts of the heat generating unit 5, as shown in FIG. 2C.

4th process: shaping process

The cut material 1 is folded at the center of the heat generating part 5 so as to be easily inserted into the cylindrical in-line heat dissipating cathode as shown in FIG. 2 (d), so that both input parts 4 are formed side by side.

5th process: 1st alignment process

30 pieces of the shaped materials 1 are arranged on the alignment table 11 as shown in FIG. 2 (e) for improving work efficiency and quality control.

6th process: 1st electrodeposition process

The primary raw insulating film 7 is formed on the heat generating part 5 and the input part 4 as shown in FIG. The weld 6 extending from does not electrodeposit.

The first to sixth steps are performed in the same manner as in the conventional manufacturing method.

7th step: primary insulating film strength conventional process

As shown in FIG. 2 (g), the first electrodeposited material 1 is hooked with a clip 22 in a drying chamber 21 of a hot air dryer 18 provided with a heating heater 19 and a blower 20. Hot air is dried for tens of seconds with hot air at 150-250 ° C. to evaporate the solvent remaining between the alumina particles during electrodeposition and increase the determination strength of the primary insulating film 7.

In this step, the primary insulating film 7 has alumina breaking strength of about 100 g / psi, which is the minimum required, so that the primary sintering step can be omitted and simply processed by the simple hot air dryer 18 in the conventional method.

8th process: 2nd electrodeposition process

The hot air dried material (1) is second electrodeposited in the mixed alumina particulate matter of 900 sheets and 2000 meshes in size to form the input section 4 and the smoke section 5 as shown in the second (h). (6) It is not electrodeposited.

Step 9: Blackening Process

The second electrodeposited material 1 is immersed in blackening liquid for about 4 seconds and blackened for radiant heat increase to form a blackening film 9 as shown in FIG. 2 (i).

Step 10: dry side film drying process

The blackened film 9 of the blackened material 1 is dried for about 1 to 2 minutes as the infrared lamps 1 and 6 as shown in FIG. 2 (j).

11th process: 2nd alignment process

Next, the raw material 1 is aligned and stored in a tungsten mesh boat 23 which is not dissolved in the molybdenum wire dissolving solution 15 described later as shown in FIG. 2 (k).

Step 12: Sintering Process

After secondary electrodeposition and blackening, the secondary insulating film is sintered from the sintered soil 13 in a dry hydrogen atmosphere at 1600 ° C. like the second (L), the material 1 aligned and stored in the tungsten mesh boat 23. (8) and the blackening film 9 are sintered.

Step 13: molybdenum wire melting process

The dissolution liquid injected into the plastic tank 24 resistant to the dissolution liquid 15 as shown in FIG. 2 (M) with the secondary electrodeposition, blackening and sintered material 1 aligned with the tungsten mash boat 23. Dipping in (15) dissolves and removes the molybdenum wire 2 which is a mandrel wire.

Here, the molybdenum wire dissolving solution 15 dissolves only the molybdenum wire 2 by mixing a mixed oxidizing agent and cannot dissolve the insulating film 7, 8, tungsten wire 3, and tungsten mash boat 23. will be.

In addition, when the capacity of the plastic tank 24 is 10 (l) is injected through the funnel 25 installed in the side wall of the tank 24, the dissolved solution 15 mixed with mixed acid 2 (l) and oxidant (3l) And 60 tungsten mash boats 23 containing the material 1 are wound on the solution 15.

In this state, the molten dendritic wire 2 is dissolved in the forced-exhausted chapter for 1 hour, and then the discharge valve 26 installed in the tank 24 is opened to discharge the dissolved liquid 15 through the discharge hose 27. .

Next, immerse the discharge valve (26) and inject about 6 (l) of cold pure water through the funnel (25) into the tank (24), wash it, discharge it with the discharge hose (27), and wash it several times. It is injected into the tank 24 through the separator 25 and neutralized for about 10 minutes, discharged through the discharge hose 27, recovered, and then washed several times with the above-described baggati cold pure water, and the hot pure water 6 above 820 ° C. It is injected into the tank 24 through the separator 25 and left for several minutes, and then repeatedly washed in a manner of being discharged through the discharge hose 27 and dried in a dryer at 100-150 ° C. for several ten minutes.

The input part 4 made of tungsten wire 3 and the heat generation by completely dissolving and removing the molybdenum wire 2, which is a mendrel wire, are repeatedly subjected to the dosing, discharging, washing, neutralization, and drying processes of the dissolution solution 15 several times. It is to obtain a heater finished product so that only the part 5 and the fusion part 6 remain.

As described above, in the dissolution process, the solution 15 and the pure ammonia are not poured in the dissolution process, but instead flow down along the inner surface of the tank 24 through the funnel 25. In order to minimize the impact on (1), and discharge them through the discharge hose 27 without tilting the tank 24, it is possible to minimize the shape deformation of the material (1) in the dissolution process.

In addition, in the prior art, molybdenum wire (M), which is a mandrel wire, is dissolved immediately after primary electrodeposition and primary sintering, so that molybdenum wire (M) is removed and the shape of the tungsten wire (3) is maintained only by the primary insulating film (7), In other words, in the present invention, the molybdenum wire (2) is dissolved and removed in the final process after the 12th and 2nd electrodeposition and sintering, so that the shape change can be minimized. .

In addition, in the second electrodeposition, blackening and dissolution process, the materials (1) are not rearranged for each process one by one, but these three processes are processed as they are once aligned in the second electrodeposition, thereby reducing the number of alignments of the materials (1) to a minimum. It can contribute to minimizing the shape change.

In addition, since the sintering process in the conventional method is replaced by the hot air drying process by the simple hot air dryer 18, and the alignment process of the aberration is omitted, the process is simplified and the defect rate can be reduced to 5% or less, thereby improving productivity and reducing cost. You can not.

On the other hand, in the prior art, the reforming and modification were carried out after the melting process, but in the present invention, since it was dissolved in the final process, high finished products can be obtained without the reforming and modification.

In addition, in the present invention, since the blackness (saturation) of the blackening film 9 is impaired due to the dissolution in the final process, the number of which is not completely released between the alumina particles is generated during the continuous heat run. Intensive inspection of emission time and vacuum degree to check whether there is a possibility of affecting the pipe, and discharge, direct current, voltage rise test to check whether sintering strength may affect electric and thermal shock. As a result of the withstand voltage test, it was confirmed that there was no difference compared with the heater manufactured by the conventional method.

Claims (1)

The length of one heater through a baking process and a process of obtaining a material 1 having an input portion 4 and a heat generating portion 5 alternately wound by winding a tungsten wire 3 of a heating wire and a molybdenum wire 2 of a mandrel wire of a single coil. The process of cutting with a die, a shaping process, a primary alignment process, and a primary electrodeposition process for electrodepositing the primary insulating film 7 on the input unit 4 and the heat generating unit 5 by a known method are carried out, and then the material 1 is subjected to a hot air dryer. Hot-air dry at 200-220 ° C. at 18 to increase the strength of the primary insulating film 7, and electrodeposit the secondary insulating film 8 by secondary electrodeposition, thereby forming a blackening film 9 thereon. After drying, the material 1 is aligned and stored in the tungsten mash boat 23 to sinter the secondary insulating film 8 and the blackening film 9, and the material 1 is placed on the tungsten mash boat 23. In the plastic tank 24 having the funnel 25 and the discharge hose 27 installed therein, the solution 15, the pure water, and the funnel 25 and the discharge hose 27 are stored. A method for producing an electron gun heater for a water tube, characterized by dissolving and removing molybdenum wire (2) while sequentially injecting and discharging ammonia.

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