KR20210099071A - discharge electrode plate - Google Patents

Abstract

(Objective) The present invention relates to a discharge electrode plate for forming an elongated discharge electrode for corona discharge.
(Configuration) A heat-resistant plate made of a heat-resistant material, and a discharge electrode formed by coating and firing a conductive glass in an elongated or elongated groove formed on the heat-resistant plate, wherein the discharge electrode is formed of an electronically conductive conductive glass It is formed to reduce the deterioration caused by corona discharge, so that the lifespan is prolonged.

Description

discharge electrode plate

The present invention relates to a discharge electrode plate for forming an elongated discharge electrode for corona discharge.

In the prior art, as one of the methods of modifying the surface of a polymer resin to make a smooth surface into small irregularities or rough shapes, there is a method in which corona discharge is generated in the air.

By causing the corona discharge to pass through the polymer resin in this way, the activated ions in the plasma appropriately make the surface of the resin uneven or jagged.

When the surface of the polymer resin has a small concavo-convex shape, it changes from water repellency to hydrophilic property. For example, as an application product, the surface of a foot for drying steam should be made with small concavities and convexities. Accordingly, the laver pulled from the seawater has a corresponding adhesion, but in a state where the surface of the polymer resin is smooth, this adhesion is not obtained and the laver does not adhere to the foot.

As described above, the surface modification treatment of the polymer resin is performed by generating a corona discharge in the air. As the material of the discharge electrode, metals (eg, stainless steel, tungsten) have been conventionally used.

However, in the prior art, when metals (stainless steel, tungsten) are used as a discharge material for corona discharge, the surface is oxidized in a very short time (about one week at the earliest) due _{to ozone (O 3 ) generated in a large amount under the corona discharge plasma.} However, there was a problem in that the supply of electrons from the surface of the discharge electrode was not performed smoothly, so that it could not be used.

Also, the surface of the discharge electrode is oxidized in a short period of time (about one week), so that discharge cannot be made, and there is a problem that replacement of the discharge electrode is required.

The present inventors have discovered through experiments that the supply of electrons is smoothly performed over a long period of time even when conductive glass as a discharge electrode material is subjected to corona discharge.

Therefore, the present invention relates to a discharge electrode plate for forming an elongated discharge electrode for corona discharge, a heat-resistant plate made of a heat-resistant material, and a conductive glass in an elongated groove formed on the heat-resistant plate or on the heat-resistant plate. A discharge electrode formed by coating and firing is provided, and the discharge electrode is formed of electroconductive conductive glass to reduce deterioration due to corona discharge, thereby prolonging the lifespan.

At this time, the conductive glass is made of vanadate glass composed of vanadium, barium, and iron.

Further, the heat-resistant plate is made of heat-resistant glass.

In addition, a lead wire is connected by soldering to the discharge electrode.

The soldering of the lead wire to the discharge electrode is performed by ultrasonic soldering.

In addition, in forming a discharge electrode by coating and firing conductive glass, a paste containing a powder of conductive glass is generated, and the resulting paste is applied and fired to form an electronically conductive discharge electrode.

In addition, a high-frequency voltage within a range of 10 KHz to 30 KHz is applied between the discharge electrode and the other electrode facing the discharge electrode or between the discharge electrode and the other electrode facing the discharge electrode to cause corona discharge around the discharge electrode.

[Fig. 1] A configuration example of the discharge electrode plate of the present invention.
[Fig. 2] It is a flowchart of the manufacturing process of the present invention.
[Figure 3] A flowchart of the ABL glass paste application method of the present invention.
4 is an explanatory view of the ABL glass paste of the present invention.
[Fig. 5] It is explanatory drawing of the example of screen printing conditions of this invention.
[Fig. 6] It is explanatory drawing of the example of ultrasonic soldering conditions of this invention.
[Fig. 7] It is an explanatory diagram of an example of the operation condition of corona discharge according to the present invention.
[Fig. 8] An example of a sample specification of the present invention.
[Fig. 9] It is an explanatory diagram of the crystallinity difference according to the firing conditions of the present invention.
[Fig. 10] It is explanatory drawing of the presence or absence of a groove|channel of this invention.
11] It is explanatory drawing of the electrode material of this invention.
12 is a structural example of the electrode part of the present invention.

(Example 1)

Fig. 1 shows a configuration example of a discharge electrode plate of the present invention.

In Fig. 1, a heat-resistant glass plate 1 supports the discharge electrode 3, and is a heat-resistant plate that can withstand high temperature due to corona discharge.

The hole 2 is a hole for fixing the heat-resistant glass plate 1 to an apparatus (not shown).

The discharge electrode 3 is an electrode for corona discharge, and is an elongated electrode formed by coating and firing conductive glass. In the experiment, the width is about 1 mm to 30 mm, the length is 10 cm, and as long as it can be realized, it may be as long as possible.

Soldering 5 schematically shows that lead wire 6 is soldered. Here, since the discharge electrode 3 is made of conductive glass, the lead wire 6 is soldered by ultrasonic soldering. Soldering without ordinary ultrasonic waves is difficult.

The lead wire 6 supplies power for corona discharge around the discharge electrode 3 by soldering it to the discharge electrode 3 and applying a high-frequency voltage.

Next, the manufacturing process of FIG. 1 will be described in detail according to the sequence of the flowchart of FIG.

Fig. 2 shows a flowchart of the manufacturing process of the present invention.

In Figure 2, in S1, ABL glass paste (ABL glass paste) is prepared. That is, ABL glass paste (name of conductive glass paste) which is a conductive paste for forming the discharge electrode (conductive glass) 3 of FIG. 1 is prepared (refer to FIG. 4 to be described later).

In S2, ABL glass paste is applied. That is, the ABL glass paste prepared in S1 is screen-printed in a pattern for forming the discharge electrode 3 of FIG. 1 and applied to a thickness of about 500 μm.

In S3, the ABL glass paste is dried. That is, since the ABL glass paste was applied by screen printing in the pattern of the discharge electrode 3 of FIG. 1 in S2, the ABL glass paste of the applied pattern was dried with hot air at 100° C. for 1 hour.

At S4, firing is carried out. That is, after hot air drying in S3, firing is carried out at 500°C to 600°C. Firing may be performed by irradiating it with an infrared lamp or putting it in a kiln (refer to Fig. 8).

In S5, a lead wire is attached to the electrode. The lead wire 6 is ultrasonically soldered to the discharge electrode 3 of Fig. 1 after firing in S4.

As described above, the ABL glass paste is screen-printed on the heat-resistant glass plate 1 of FIG. 1, dried and fired, and the discharge electrode 3 is electrically conductive and is not deteriorated by corona discharge and has a long lifespan. ) can be formed.

Hereinafter, it will be described in detail sequentially.

3 shows a flowchart of the ABL glass paste application method of the present invention. That is, detailed flowcharts of S2, S3, and S4 of FIG. 2 described above are shown.

3, in S11, ABL glass paste is screen-printed and applied to the substrate. That is, the ABL glass paste is screen-printed to form the pattern of the discharge electrode 3 of FIG.

In S12, it is left in a dry atmosphere. That is, after screen printing in S11, it is left to stand in a dry atmosphere for 2 to 24 hours to dry naturally.

In S13, the solvent is removed. That is, after natural drying in S12, in order to completely evaporate the solvent, it is dried in an electric furnace at 40-100° C. for 100 minutes.

At S14, firing is performed. That is, annealing is performed so that the pattern (ABL glass paste is applied) of the discharge electrode 3 is completely conductive glass by putting it in an electric furnace at 500°C to 600°C or by irradiating an infrared lamp and firing (see FIG. ) while being fixed to the heat-resistant glass plate (1).

As described above, the pattern of the discharge electrode 3 is screen-printed on the heat-resistant glass plate 1 of FIG. 1 using the ABL glass paste, and is naturally dried, hot air dried, and fired to obtain low resistance. Furthermore, it became possible to form the discharge electrode 3 of conductive glass with a long service life without being deteriorated by corona discharge.

Fig. 4 shows an explanatory view of the ABL glass paste of the present invention. That is, the explanatory drawing of the ABL glass paste (conductive glass paste) used for screen printing is shown.

The component example in FIG. 4 shows the example of the component required in order to create an ABL glass paste. Components, concentration ranges (wt%), and remarks shown in the drawings are as follows.

Here, the vanadate glass of the component example consists of 60-85 weight% of powder of about 2-3 micrometers as a main material. The following diethylene glycol monobutyl acetate is an organic material, which binds the main particles, and consists of 10 to 30% by weight. The following terpineol is an organic solvent, which adjusts the paste concentration and consists of 5 to 15% by weight. The following cellulosic resin is for adhering to a coating material (here, the heat-resistant glass plate 1 in Fig. 1), and is composed of 1 to 10% by weight.

ABL glass paste can be prepared by mixing and kneading in the above ratio.

Fig. 5 shows an explanatory diagram of an example of screen printing conditions of the present invention. Fig. 5 is an outline of the printing conditions when screen printing the pattern of the discharge electrode (conductive glass) 3 on the heat-resistant glass plate 1 of Fig. 1 using the ABL glass paste in S11 of Fig. 3 will be.

In Fig. 5, the items are items for screen printing, the example conditions are the conditions for screen printing of each item, and the remarks describe information such as each item, material required for the condition, particle size, and the like. As one thing, it is as follows shown in drawing, for example.

Here, the screen wire diameter is the wire diameter of the screen mesh at the time of screen printing, and the thing of 16 micrometers was used here. The screen mesh needs to be a material that is not affected by corrosion by the solvent of the ABL glass paste.

A mesh of 325 pieces/inch was used. As the aperture, a 62 μm thing was used as the aperture of the mesh. The mesh space ratio was 63%.

By screen printing having the above items, conditions, and remarks, the screen printing of S11 in Fig. 3 described above was performed.

Fig. 6 shows an explanatory diagram of an example of ultrasonic soldering conditions of the present invention. FIG. 6 is an explanatory diagram of an example of conditions when the lead wire 6 is ultrasonically soldered to the discharge electrode (conductive glass) 3 of FIG.

In Fig. 6, an example item is an item at the time of ultrasonic soldering, and an example condition is a condition at the time of ultrasonic soldering of each item.

Here, the ultrasonic power was used within the range of 1 to 10 W (preferably about 2 W or less) as the output of the ultrasonic wave during ultrasonic soldering. The solder material is a solder material used for ultrasonic soldering, and a tin-zinc lead-free solder is used here. As the temperature of the tip of the soldering iron for ultrasonic soldering, a temperature within the range of 250°C to 450°C was used (the optimum temperature of the tip is determined by experimentation because the temperature depends on the solder material used). As the ultrasonic frequency, an ultrasonic frequency within the range of 20 to 60 KHz was used in the experiment.

By ultrasonic soldering provided with the above items and conditions, it was possible to cleanly ultrasonically solder the lead wire 6 to the discharge electrode (conductive glass) 3 of FIG. With normal soldering without ultrasonic waves, soldering was not possible due to poor soldering.

Fig. 7 is an explanatory diagram showing an example of the operating conditions of the corona discharge according to the present invention. That is, discharge of the previously described discharge electrode (conductive glass) 3 of FIG. 1 and the opposing flat flat plate (larger area than the discharge electrode 3; not shown) or the heat-resistant glass plate 1 A high-frequency voltage (about 10 KHz to 40 KHz) is applied between a flat plate (larger in area than the discharge electrode 3, not shown) opposite to the surface on which the electrode 3 is formed, and the discharge electrode ( 3) An example of operating conditions for corona discharge to cover the phase is shown (refer to Fig. 10).

In Fig. 7, the example item is an item at the time of corona discharge, and the example condition is the condition at the time of corona discharge of each item.

Here, the applied voltage is a voltage applied during corona discharge, and was used within the range of 2 to 10 KV. In addition, the frequency is the frequency at the time of corona discharge, and when the frequency is 10 KHz or less, atoms such as oxygen and nitrogen in the air collide with the electrode, and the probability of sputtering the electrode to wear out increases, so here it is 10 KHz to 40 KHz did.

By providing the above items and conditions, it was possible to perform corona discharge so as to cover the discharge electrode (conductive glass) 3 of FIG. 1 (refer to FIG. 10 to be described later).

8 shows an example of a sample of the present invention. That is, an example in which firing conditions, presence or absence of grooves, and resistivity were measured for a sample of the discharge electrode (conductive glass) 3 prepared according to the procedure of the flowchart in FIG. 2 is shown.

In Fig. 8, No is the number of the sample, the firing conditions are the temperature conditions in which the ABL glass paste is applied and fired, the grooves are the presence or absence of grooves on the heat-resistant glass plate 1 of Fig. 1, and the resistivity is the lead wire 6 is the resistivity (Ω·cm) from to the end of the discharge electrode 3 .

Here, the firing conditions of the sample (1) indicate a sample which is heated at 600° C. for 30 minutes, then quenched, and then cooled naturally after heating at 550° C. for 30 minutes. The other samples are shown in the same manner.

In all of samples (1) to (7), the resistivity from the lead wire 6 to the end of the discharge electrode (conductive glass) 3 in Fig. 1 was 200 to 47 Ω·cm as shown in the figure, and the corona discharge could be generated well. In addition, since the discharge electrode 3 is made of electroconductive glass, deterioration due to corona discharge is very small, and the lifespan can be prolonged compared to the conventional stainless steel discharge electrode. In addition, the resistivity of the heat-resistant glass plate 1 with or without grooves for the discharge electrode 3 on the heat-resistant glass plate 1 of Fig. 1 was slightly different, but the resistivity was sufficient for corona discharge.

Fig. 9 shows an explanatory diagram of the crystallinity difference according to the firing conditions of the present invention.

Fig. 9(a) shows an example of an optical micrograph of the surface of the discharge electrode 3 which is rapidly cooled after heating at 600°C for 30 minutes, and FIG. 9(b) is a discharge that is naturally cooled after heating at 570°C for 30 minutes An example of an optical micrograph of the surface of the electrode 3 is shown, and FIG. 9(c) shows an example of an optical micrograph of the surface of the discharge electrode 3 which is naturally cooled after heating at 600° C. for 30 minutes.

In Fig. 9, as shown in the upper side, the crystal grains in Fig. 9 (a) are the smallest, and the crystal grains are larger in the directions of Figs. 9 (b) and 9 (c). That is, in Fig. 9(a), although the temperature is as high as 600°C, the high-temperature state is maintained as it is due to rapid cooling, and the crystal grains are small. On the other hand, in (b) and (c) of FIG. 9 , the temperature is high at 570° C. and 600° C., and natural cooling is performed, so that the crystal grains grow and become larger during cooling. By selecting a good firing temperature and rapid cooling/natural cooling for corona discharge, it is possible to adjust the size of the crystal grains on the surface of the discharge electrode 3 from small to large. Alternatively, natural cooling may be selected for firing.

Fig. 10 is an explanatory diagram showing the presence or absence of a groove according to the present invention. That is, the presence or absence of the groove of the discharge electrode 3 formed on the heat-resistant glass plate 1 of FIG. 1 is schematically described.

Fig. 10 (a) schematically shows a cross-sectional side view of the heat-resistant glass plate 1 of Fig. 1 when there is a groove, and Fig. 10 (b) is the heat-resistant glass of Fig. 1 when there is no groove. A cross-sectional side view of the plate 1 is schematically shown.

In Fig. 10(a), after the conductive glass paste is applied and fired (2 to 3 times) in the groove, the conductive glass 31 shown in the figure enters the inside of the heat-resistant glass plate 1, , as the angle of the corona discharge becomes narrower than that of Fig. 10(b) as shown in the figure, it becomes possible to irradiate the corona discharge by focusing the corona discharge on the object to be treated with the corona discharge.

In Fig. 10(b), after the conductive glass paste is directly coated and fired on the heat-resistant glass plate 1 without grooves, the conductive glass 32 shown in the figure has a convex shape on the heat-resistant glass plate 1 state, and the angle of the corona discharge is wider than that in Fig. 10(a) as shown in the figure, so that it is possible to irradiate the corona discharge to a wide range of the object to be treated with the corona discharge.

Fig. 10(c) is a table showing characteristics of grooving and non-grooving in a table, and is as follows.

Here, the case with grooving is the case of Fig. 10(a) with grooves, and the case without grooving shows the case of Fig. 10(b) without the grooving. The number of prints indicates the number of times the conductive glass paste is applied and fired. In the case of grooving, since the conductive glass paste printed inside the groove is greatly reduced by firing, printing is performed twice (3 times as necessary). Needs to be. If there is no groove, even if it is reduced, only the thickness is reduced, and there is no problem in particular, so one printing is good.

As for the discharge directionality, as described above, grooving (with) has a discharge directionality in which the irradiation direction of the corona discharge is narrow. On the other hand, grooving (none) has no discharge direction.

Storage is easy when there is grooving because it is easy to stack and store. On the other hand, when there is no grooving, the discharge electrode 3 protrudes on the heat-resistant glass plate 1, and storage is difficult because it cannot be stacked on top of each other.

The electrode thickness depends on the depth of the groove in the case of grooving. In the case where there is no grooving, as shown in Fig. 10(b), a semi-circular shape is obtained, and it is usually 500 µm or less.

Fig. 11 shows an explanatory view of the electrode material of the present invention. That is, the initial voltage V for corona discharge when various materials are used as the discharge electrode 3 in FIG. 1 is obtained.

In Fig. 11, the electrode material is the material of the discharge electrode for corona discharge, and the initial voltage V is the initial voltage for starting the corona discharge. For example, as shown in the figure below.

Here, conventional tungsten and stainless steel had an initial voltage of 5 to 6 KV. The discharge electrode 3 of the ABL glass (electroconductive glass) of the present invention is 3.7 to 4.0 KV for coarse crystals, 4.5 to 4.8 KV for slightly coarse crystals, and 4.9 to 5.0 KV for fine crystals, either of which is a conventional stainless steel or the like. It was found that the corona discharge was started and maintained at a lower initial voltage compared to the metal of

12 shows a structural example of the electrode part of the present invention. That is, it schematically shows a structure in which a hole is drilled in the heat-resistant glass plate 1 of FIG. 1 and the lead wire 6 is directly ultrasonically soldered from the hole to the back surface of the discharge electrode (conductive glass) 3 .

In Fig. 12, a hole 9 is a hole formed from the rear surface of the heat-resistant glass plate 1 toward the rear surface of the discharge electrode (conductive glass) 3 .

By forming the holes 9 as described above, after coating and firing the discharge electrodes (conductive glass) 3 with grooves (or without grooves) on the heat-resistant glass plate 1, the lead wires 6 are inserted into the holes. Ultrasonic soldering (8) is applied to the discharge electrode (conductive glass) (3) through the inside of (9), and the lead wire (6) is connected to the discharge electrode (3). Accordingly, as shown in the figure, on the surface of the heat-resistant glass plate 1, only the discharge electrode 3 is exposed. By eliminating protrusions and the like in the case of soldering, irregular corona discharge at the tip of the discharge electrode 3 is eliminated, and uniform corona discharge can be realized even at the tip of the discharge electrode 3 .

1: Heat-resistant glass plate
2, 9: Hall
3: Discharge electrode (conductive glass, ABL glass)
31, 32: conductive glass
5: Soldering (ultrasonic soldering)
6: lead wire
8: Ultrasonic Soldering

Claims (7)

In a discharge electrode plate forming a long and thin discharge electrode for corona discharge,
A heat-resistant plate made of heat-resistant material,
Discharge electrodes formed by coating and firing conductive glass in a long, elongated groove on the heat-resistant plate or formed on the heat-resistant plate
provided,
A discharge electrode plate, characterized in that the discharge electrode is formed of electrically conductive conductive glass to reduce deterioration due to corona discharge, thereby prolonging the lifespan.
According to claim 1,
The conductive glass is a discharge electrode plate, characterized in that it is made of vanadate glass composed of vanadium, barium, and iron.
3. The method of claim 1 or 2,
The heat-resistant plate is a discharge electrode plate, characterized in that it is made of heat-resistant glass.
4. The method according to any one of claims 1 to 3,
Discharge electrode plate, characterized in that the lead wire (lead wire) is connected by soldering to the discharge electrode.
5. The method according to any one of claims 1 to 4,
A discharge electrode plate, characterized in that the soldering of the lead wire to the discharge electrode is carried out by ultrasonic soldering.
6. The method according to any one of claims 1 to 5,
Forming a discharge electrode by coating and firing conductive glass is characterized in that a paste containing a powder of conductive glass is generated, and the resulting paste is applied and fired to form an electronically conductive discharge electrode. discharge electrode plate.
7. The method according to any one of claims 1 to 6,
A high-frequency voltage within the range of 10 KHz to 30 KHz is applied between the other electrode facing the discharge electrode or the other electrode facing the discharge electrode to cause corona discharge around the discharge electrode. discharge electrode with

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