TWI832526B - Antistatic protection components - Google Patents

Abstract

The present invention provides an antistatic protection element, which includes a substrate, a first internal electrode, a second internal electrode, an antistatic protection layer and a barrier layer; wherein the barrier layer contains a porous structure. The substrate has an opposite top surface and a bottom surface; a first internal electrode and a second internal electrode are respectively disposed on the top surface of the substrate, and there is a gap between the first internal electrode and the second internal electrode; an antistatic protective layer is disposed on On the top surface of the substrate, and located between the first internal electrode and the second internal electrode, the antistatic protective layer is in contact with the first internal electrode and the second internal electrode respectively. By setting the barrier layer and adjusting its formula, the present invention can reduce the risk of internal explosion of the anti-static protection element and improve the anti-static shock resistance of the anti-static protection element.

Description

Antistatic protection components

The present invention relates to an anti-static protection component, especially an anti-static protection component used in communication equipment or vehicles.

Static electricity is a natural phenomenon caused by the uneven distribution of charge on an object. In today's era of miniaturization of integrated circuits, due to the compression of wiring intervals, the anti-static ability of the circuit itself is also weakened. Therefore, in the face of the ubiquitous electrostatic discharge (ESD) problem, it is necessary to install anti-static protection components. Gradually gaining attention, the more common anti-static protection components include transient voltage suppression diodes and varistors, etc., which will present a high resistance state at normal operating voltage and will be in a state of high resistance during surges, abnormal voltages or electrostatic discharges. When a higher voltage appears, it instantly changes to a low-resistance state to conduct overcurrent away from the protected circuit to achieve circuit protection.

However, when anti-static protection components face unexpected situations such as surges, lightning strikes or electrostatic discharges, they can easily cause internal explosion of the anti-static protection components and lose their circuit protection effect. Therefore, how to improve the reliability and durability of anti-static protection components is still a challenge. It is a subject that requires continued research.

In order to solve the above problems, the present invention provides an antistatic protection element, which includes a substrate, a first internal electrode, a second internal electrode, an antistatic protection layer and a barrier layer; wherein, the substrate has an opposite a top surface and a bottom surface; the first internal electrode and the second internal electrode are respectively disposed on the top surface of the substrate, and there is a gap between the first internal electrode and the second internal electrode; The antistatic protective layer is disposed on the top surface of the substrate and is located between the first internal electrode and the second internal electrode; the antistatic protective layer is respectively connected with the first internal electrode and the third internal electrode. Two internal electrodes are in contact; and the barrier layer covers the antistatic protective layer; wherein the firing temperature of the antistatic protective layer is higher than the firing temperature of the barrier layer, and the barrier layer The layer contains a porous structure.

The present invention reduces the risk of internal explosion of the antistatic protective element by providing a barrier layer containing a porous structure, and by limiting the relationship between the firing temperature of the antistatic protective layer and the firing temperature of the barrier layer, This prevents the antistatic protective layer from being damaged during the sintering process of the barrier layer, thereby improving the reliability and durability of the antistatic protective component of the present invention.

According to the present invention, the firing temperature of the antistatic protective layer means that the firing temperature that the antistatic protective layer can withstand or is suitable for is higher than the firing temperature that the barrier layer can withstand or is suitable for. The sintering temperature refers to the highest temperature reached by the heating system during the sintering process.

Preferably, the barrier layer containing a porous structure means that the barrier layer is a porous sintered body.

In some implementations, the first internal electrode and the second internal electrode each include silver, palladium, or a combination thereof.

According to the present invention, the first internal electrode has an opposite first surface and a second surface, and the first surface of the first internal electrode is away from the substrate; the antistatic protective layer has an opposite first surface. One side and a second side, and the first side of the antistatic protective layer is away from the substrate; and the second inner electrode has an opposite first side and a second side, and the second inner electrode The first side of the electrode is away from the substrate.

In some embodiments, the first internal electrode and the second internal electrode are respectively provided at opposite ends of the top surface of the substrate.

In some implementations, the antistatic protective layer covers the first internal electrode and the second internal electrode. Preferably, the second surface of the antistatic protective layer covers the first surface of the first internal electrode and the first surface of the second internal electrode. More preferably, the second surface of the antistatic protective layer covers part of the first surface of the first internal electrode and part of the first surface of the second internal electrode.

Preferably, the total area of the first surface of the first internal electrode includes all surface areas not in direct contact with the substrate, and the total area of the second surface of the first internal electrode includes the first internal electrode. The contour area of the surface in direct contact with the substrate.

Preferably, the total area of the first surface of the second internal electrode includes all surface areas not in direct contact with the substrate, and the total area of the second surface of the second internal electrode includes the second internal electrode. The contour area of the surface in direct contact with the substrate.

The "contour area" is calculated based on the outer contour of the surface, for example: side length 1 cm * 1 cm = 1 square centimeter.

Preferably, the total area of the first surface of the antistatic protective layer includes all surface areas not in direct contact with the substrate.

Preferably, the total area of the second surface of the antistatic protective layer refers to the projection of the first surface of the antistatic protective layer to the second surface of the antistatic protective layer (ie, the top surface of the substrate) the projected area. More preferably, the projection area is along a direction perpendicular to the second surface of the antistatic protective layer (ie, the top surface of the substrate), and projects the first surface of the antistatic protective layer to the antistatic surface. The second side of the electrostatic protective layer.

Preferably, based on the total area of the second surface of the first internal electrode, the second surface of the antistatic protective layer covers the first surface of the first internal electrode and is projected to the first internal electrode. The projected area of the second surface (ie, the top surface of the substrate) accounts for 3% to 30%, for example: 3%, 5%, 10%, 15%, 20%, 25% or 30%. More preferably, the projection area is along a direction perpendicular to the second surface of the first internal electrode, so that the second surface of the antistatic protective layer covering the first surface of the first internal electrode is projected to the the second side of the first internal electrode.

Preferably, based on the total area of the second surface of the second internal electrode, the second surface of the antistatic protective layer covers the first surface of the second internal electrode and is projected to the second internal electrode. The projected area of the second side accounts for 3% to 30%, for example: 3%, 5%, 10%, 15%, 20%, 25% or 30%. More preferably, the projected area is along a direction perpendicular to the second surface of the second internal electrode (ie, the top surface of the substrate), and the second surface of the antistatic protective layer covers the second surface of the second inner electrode. The first side of the internal electrode projects onto the second side of the second internal electrode.

In some embodiments, the first surface of the first internal electrode is the top surface, the first surface of the second internal electrode is the top surface, and the second surface of the antistatic protective layer covers the third surface. A partial area of the top surface of one internal electrode and a partial area of the top surface of the second internal electrode.

The present invention improves the charging and discharging performance of the antistatic protection element by increasing the contact area of the antistatic protective layer with the first internal electrode and the second internal electrode, thereby improving the antistatic protection layer of the present invention. Anti-static protection effect of electrostatic protection components.

In other embodiments, the antistatic protective layer covers the first internal electrode, and the second internal electrode covers the antistatic protective layer. Specifically, the second surface of the antistatic protective layer covers the first surface of the first internal electrode, and the second surface of the second internal electrode covers the first surface of the antistatic protective layer. Preferably, the second surface of the antistatic protective layer covers part of the first surface of the first internal electrode, and the second surface of the second internal electrode covers the first surface of the antistatic protective layer. part of the area.

The present invention further improves the anti-static protection layer by extending the anti-static protective layer to the first surface of the first internal electrode, and the second internal electrode extends to the first surface of the anti-static protective layer. The contact area between the electrostatic protective layer and the first internal electrode and the second internal electrode. Preferably, the second surface of the antistatic protective layer extends to the first surface of the first internal electrode, and the second surface of the second internal electrode extends to the first surface of the antistatic protective layer. .

Preferably, based on the total area of the second surface of the antistatic protective layer, the second surface of the second internal electrode covers the first surface of the antistatic protective layer and is projected to the antistatic protective layer. The projected area of the second side accounts for 10% to 70%, for example: 10%, 20%, 30%, 40%, 50%, 60% or 70%. More preferably, the projected area is along a direction perpendicular to the second surface of the antistatic protective layer (ie, the top surface of the substrate), covering the second surface of the second internal electrode with the antistatic layer. The first side of the protective layer projects onto the second side of the antistatic protective layer.

In some embodiments, the first surface of the first internal electrode is the top surface, the first surface of the antistatic protective layer is the top surface, the first surface of the second internal electrode is the top surface, and The second surface of the antistatic protective layer covers a partial area of the top surface of the first internal electrode, and the second surface of the second internal electrode covers a partial area of the top surface of the antistatic protective layer.

In some implementations, the barrier layer includes a ceramic material and a first glass material.

Preferably, based on the total weight of the barrier layer, the content of the ceramic material is greater than 50 weight percent. More preferably, based on the total weight of the barrier layer, the content of the ceramic material is greater than 50 weight percent and less than or equal to 83 weight percent, for example: 50.1 weight percent, 50.5 weight percent, 51 weight percent, 55 weight percent. percent, 60 weight percent, 65 weight percent, 70 weight percent, 75 weight percent, 80 weight percent or 83 weight percent. Preferably, the content of the first glass material is greater than or equal to 17 weight percent and less than 50 weight percent, for example: 17 weight percent, 20 weight percent, 25 weight percent, 30 weight percent, 35 weight percent, 40 weight percent. , 45 weight percent, 49 weight percent, 49.5 weight percent or 49.9 weight percent.

According to the present invention, when the content of the ceramic material contained in the barrier layer is greater than the content of the first glass material, the number of times of anti-static shock resistance of the anti-static protection element of the present invention can be significantly improved, and the anti-static protection element of the present invention can also be reduced. The risk of internal explosion of components further enhances the reliability and durability of anti-static protection components.

In some embodiments, the ceramic material includes any one or a combination of aluminum oxide, silicon carbide, silicon nitride, and aluminum nitride.

According to the present invention, the ceramic material contained in the barrier layer has a melting point significantly higher than the softening point of the first glass material and can withstand higher temperatures during the sintering process without affecting the efficacy of the barrier layer. The firing temperature that the barrier layer can withstand or is suitable for depends on the softening point of the first glass material, and the firing temperature that the barrier layer can withstand or is suitable for is higher than the softening point of the first glass material. 10 ^○ C to 100 ^○ C, for example: 10 ^○ C, 25 ^○ C, 50 ^○ C, 75 ^○ C or 100 ^○ C. In addition, the firing temperature that the barrier layer can withstand or is suitable for may be determined by the glass transition temperature (Tg), transformation point or deformation point of the first glass material. .

In an embodiment, the firing temperature of the barrier layer is 400 ^○ C to 550 ^○ C, such as: 400 ^○ C, 430 ^○ C, 460 ^○ C, 470 ^○ C, 490 ^○ C, 520 ^○ C or 550 ^○ C; preferably, the firing temperature of the barrier layer is 450 ^○ C to 510 ^○ C; more preferably, the firing temperature of the barrier layer is 480 ^○ C to 500 ^○ C.

In an embodiment, the first glass material contained in the barrier layer has a softening point of 350 ^○ C to 540 ^○ C, such as: 350 ^○ C, 400 ^○ C, 450 ^○ C, 500 ^○ C or 540 ^○ C ; Preferably, the softening point of the first glass material is 420 ^○ C to 445 ^○ C; more preferably, the softening point of the first glass material is 430 ^○ C to 436 ^○ C.

In one implementation, the glass transition temperature of the first glass material contained in the barrier layer is 350 ^○ C to 375 ^○ C, for example: 350 ^○ C, 355 ^○ C, 360 ^○ C, 365 ^○ C, 370 ^○ C or 375 ^○ C; preferably, the glass transition temperature of the first glass material is 360 ^○ C to 366 ^○ C.

In an embodiment, the sintering temperature of the barrier layer is 360 ^○ C to 550 ^○ C, for example: 360 ^○ C, 400 ^○ C, 430 ^○ C, 460 ^○ C, 490 ^○ C, 520 ^○ C or 550 ^○ C; preferably, the sintering temperature of the barrier layer is 360 ^○ C to 510 ^○ C; more preferably, the sintering temperature of the barrier layer is 400 ^○ C to 510 ^○ C.

According to the present invention, the upper and lower limits of the sintering temperature refer to the highest temperature and the lowest temperature reached by the heating system during the sintering process.

In some embodiments, the first glass material contained in the barrier layer includes bismuth trioxide (Bi ₂ O ₃ ), boron trioxide (B ₂ O ₃ ), and zinc oxide (ZnO). Preferably, based on the total weight of the first glass material contained in the barrier layer, the content of bismuth trioxide is 70 to 90 weight percent, for example: 70 weight percent, 73 weight percent, 75 weight percent, 78% by weight, 81% by weight, 84% by weight, 87% by weight or 90% by weight; the content of boron trioxide is 1% by weight to 15% by weight, for example: 1% by weight, 3% by weight, 5% by weight, 7 weight percent, 9 weight percent, 12 weight percent or 15 weight percent; and the content of zinc oxide is 1 weight percent to 15 weight percent, for example: 1 weight percent, 3 weight percent, 5 weight percent, 7 weight percent, 9 weight percent , 12 weight percent or 15 weight percent.

In some embodiments, the barrier layer further includes glass fibers. Preferably, the length of the glass fiber is 100 microns to 200 microns. The inclusion of glass fiber in the barrier layer can further reduce the risk of internal explosion of the antistatic protection element.

In some embodiments, the antistatic protective layer includes metal, metal carbide, and filler.

In some embodiments, the metal includes any one or a combination of palladium, silver, platinum, and gold.

In some embodiments, the metal carbide includes any one of iron carbide, nickel carbide, titanium carbide, tungsten carbide, zirconium carbide, chromium carbide and vanadium carbide or a combination thereof.

In some embodiments, the filler includes a second glass material.

According to the present invention, when both the barrier layer and the antistatic protective layer contain an appropriate amount of glass components, the adhesion between the barrier layer and the antistatic protective layer can be further improved, thereby improving the antistatic properties of the present invention. The structural strength of the protection element is used to reduce the breakdown rate, so as to improve the anti-static shock resistance, reliability and durability of the anti-static protection element of the present invention.

According to the present invention, the melting point of the metal and metal carbide contained in the antistatic protective layer is significantly higher than the softening point of the second glass material, and can withstand higher temperatures during the sintering process without affecting the antistatic layer. The function of the protective layer, so the firing temperature that the antistatic protective layer can withstand or is suitable for depends on the softening point of the second glass material, and the firing temperature that the antistatic protective layer can withstand or is suitable for is compared to The softening point of the second glass material is 10 ^○ C to 100 ^○ C higher, for example: 10 ^○ C, 25 ^○ C, 50 ^○ C, 75 ^○ C or 100 ^○ C. In addition, the firing temperature that the antistatic protective layer can withstand or is suitable for may be determined by the glass transition temperature, transition point or deformation point of the second glass material.

In other words, the firing temperature of the antistatic protective layer is higher than the firing temperature of the barrier layer, which can be replaced by the softening point, glass transition temperature, The transition point or deformation point is higher than the softening point, glass transition temperature, transition point or deformation point of the first glass material contained in the barrier layer.

In an embodiment, the firing temperature of the antistatic protective layer is 650 ^○ C to 750 ^○ C, such as: 650 ^○ C, 670 ^○ C, 690 ^○ C, 710 ^○ C, 730 ^○ C or 750 ^○ C; Preferably, the firing temperature of the antistatic protective layer is 680 ^○ C to 720 ^○ C; More preferably, the firing temperature of the antistatic protective layer is 695 ^○ C to 705 ^○ C.

In one embodiment, the transition point of the second glass material contained in the filler is 560 ^○ C to 740 ^○ C, for example: 560 ^○ C, 590 ^○ C, 620 ^○ C, 650 ^○ C, 680 ^○ C, 710 ^○ C or 740 ^○ C; preferably, the transition point of the second glass material contained in the filler is 570 ^○ C to 640 ^○ C; more preferably, the transition point of the second glass material contained in the filler is 587 ^○ C to 627 ^○ C.

In an embodiment, the second glass material contained in the filler has a deformation point of 600 ^○ C to 740 ^○ C, such as: 600 ^○ C, 620 ^○ C, 650 ^○ C, 680 ^○ C, 710 ^○ C or 740 ^○ C; preferably, the deformation point of the second glass material contained in the filler is 667 ^○ C to 707 ^○ C.

According to the present invention, the transition point of the second glass material contained in the filler is at least 560 ^○ C, and the deformation point is at least 600 ^○ C. Therefore, when the barrier layer is subsequently sintered, due to the sintering of the barrier layer The maximum temperature is 550 ^○ C, so it will no longer substantially affect the structure and efficacy of the antistatic protective layer.

In an embodiment, the sintering temperature of the antistatic protective layer is 400 ^○ C to 750 ^○ C, for example: 400 ^○ C, 450 ^○ C, 500 ^○ C, 550 ^○ C, 600 ^○ C, 650 ^○ C , 700 ^○ C or 750 ^○ C; preferably, the sintering temperature of the antistatic protective layer is 400 ^○ C to 700 ^○ C.

Preferably, the linear expansion coefficient of the second glass material contained in the filler is 5.6*10 ^-6 / ^○ C to 6.4*10 ^-6 / ^○ C.

In some embodiments, the second glass material contained in the filler includes zinc oxide (ZnO), aluminum oxide (Al ₂ O ₃ ), silicon dioxide (SiO ₂ ), and calcium carbonate (CaCO ₃ ).

In some embodiments, based on the total weight of the antistatic protective layer, the content of the metal is 10 to 20 weight percent, for example: 10 weight percent, 13 weight percent, 15 weight percent, 18 weight percent percentage or 20 weight percent; the content of the metal carbide is 50 to 70 weight percent, for example: 50 weight percent, 55 weight percent, 60 weight percent, 65 weight percent or 70 weight percent; and the content of the filler It is 20 weight percent to 30 weight percent, for example: 20 weight percent, 23 weight percent, 25 weight percent, 28 weight percent or 30 weight percent.

In some embodiments, the antistatic protection element of the present invention further includes at least one insulating protective layer, and the at least one insulating protective layer covers the barrier layer; wherein the at least one insulating protective layer includes a third glass material Or polymer materials to further reduce the risk of internal explosion of anti-static protection components.

Preferably, the at least one insulating protective layer includes a first insulating protective layer and a second insulating protective layer; the first insulating protective layer covers the barrier layer; and the second insulating protective layer covers the The first insulating protective layer.

In some implementations, the first insulating protective layer includes a third glass material.

Preferably, the third glass material contained in the first insulating protective layer includes zinc oxide (ZnO), aluminum oxide (Al ₂ O ₃ ), silicon dioxide (SiO ₂ ) and calcium carbonate (CaCO ₃ ).

According to the present invention, the barrier layer can effectively reduce the risk of bursting of the first insulating protective layer. In addition, when the barrier layer contains an appropriate amount of glass components, the adhesion between the barrier layer and the first insulating protective layer can be further improved, and the structural strength of the antistatic protection element of the present invention can be improved to reduce breakdown. efficiency to improve the anti-static impact resistance, reliability and durability of the anti-static protection component of the present invention.

In some implementations, the second insulating protective layer includes a polymer material. Preferably, the polymer material includes any one of epoxy resin, silicone resin and phenolic resin or a combination thereof.

In some embodiments, the antistatic protection component of the present invention further includes a first external electrode and a second external electrode; wherein the first external electrode and the second external electrode are respectively disposed on the substrate. On opposite sides, the first external electrode is electrically connected to the first internal electrode, and the second external electrode is electrically connected to the second internal electrode.

In some embodiments, the first external electrode and the second external electrode each include any one or a combination of silver, nickel, and tin.

In summary, the present invention reduces the risk of internal explosion of the antistatic protection element by providing a barrier layer containing a porous structure and adjusting its formula, and by limiting the firing temperature of the antistatic protective layer and the firing temperature of the barrier layer The relationship between temperatures prevents the antistatic protective layer from being damaged during the sintering process of the barrier layer, thereby improving the reliability and durability of the antistatic protective element of the present invention. In addition, when the antistatic protective layer, the barrier layer and the first insulating protective layer all contain an appropriate amount of glass components, the antistatic protective layer, the barrier layer and the first insulating protective layer can be further improved. The adhesion between the layers can improve the structural strength of the anti-static protection component of the present invention to reduce the breakdown rate, thereby improving the anti-static shock resistance, reliability and durability of the anti-static protection component of the present invention.

Several examples are provided below to illustrate the implementation of the present invention; those skilled in the art can easily understand the advantages and effects achieved by the present invention through the content of this specification, and can make various modifications and improvements without departing from the spirit of the present invention. Modifications to implement or apply the contents of the present invention.

Example 1: Antistatic protection component

As shown in FIG. 1 , the antistatic protection component 1 includes a substrate 10 , a first internal electrode 11 , a second internal electrode 12 , an antistatic protection layer 13 and a barrier layer 14 . The substrate 10 has an opposite top surface 100 and a bottom surface 101; the first internal electrode 11 and the second internal electrode 12 are respectively disposed on the top surface 100 of the substrate 10, and the first internal electrode There is a gap between the first internal electrode 11 and the second internal electrode 12; the antistatic protective layer 13 is provided on the top surface 100 of the substrate 10 and is located between the first internal electrode 11 and the second internal electrode 12. 12 (that is, disposed in the aforementioned gap) and in direct contact with the first internal electrode 11 and the second internal electrode 12 ; the barrier layer 14 completely covers the antistatic protective layer 13 . In addition, the firing temperature of the antistatic protective layer 13 is higher than the firing temperature of the barrier layer 14 , and the barrier layer 14 includes a porous structure.

Example 2: Antistatic protection component

The antistatic protection element 1 in FIG. 2 is similar to the antistatic protection element 1 in FIG. 1 . The main difference lies in the positional relationship between the first internal electrode 11 , the second internal electrode 12 and the antistatic protection layer 13 . Specifically, as shown in FIG. 2 , in the antistatic protection element 1 , the first internal electrode 11 has a first surface 110 and a second surface 111 that are opposite to each other, and the third surface of the first internal electrode 11 is One side 110 is away from the substrate 10, and the second side 111 of the first internal electrode 11 is in direct contact with the top surface 100 of the substrate 10; the second internal electrode 12 has an opposite first side 120 and a first side. Two sides 121, and the first side 120 of the second internal electrode 12 is away from the substrate 10, and the second side 121 of the second internal electrode 12 is in direct contact with the top surface 100 of the substrate 10; the anti-static The protective layer 13 has an opposite first surface 130 and a second surface 131 , and the first surface 130 of the antistatic protective layer 13 is away from the substrate 10 , and the second surface 131 of the antistatic protective layer 13 and The top surface 100 of the substrate 10 is in direct contact.

The second surface 131 of the antistatic protective layer 13 covers part of the first surface 110 (ie, the top surface) of the first internal electrode 11 . The second surface 121 of the second internal electrode 12 covers part of the first surface 130 (ie, the top surface) of the antistatic protective layer 13 .

Example 3: Antistatic protection component

As shown in FIG. 3 , the antistatic protection element 1 further includes a first insulating protective layer 15 and a second insulating protective layer 16 . The first insulating protective layer 15 covers all of the barrier layer 14 and part of the second insulating protective layer 14 . An internal electrode 11, and part of the second internal electrode 12; and the second insulating protective layer 16 covers all of the first insulating protective layer 15, part of the first internal electrode 11, and part of the second internal electrode 12 .

In addition, the antistatic protection element 1 further includes a first external electrode 17 and a second external electrode 18; wherein the first external electrode 17 and the second external electrode 18 are respectively disposed on opposite sides of the substrate 10. 102A, 102B, and the first external electrode 17 is electrically connected to the first internal electrode 11 , and the second external electrode 18 is electrically connected to the second internal electrode 12 .

Preparation Example 1: Antistatic Protection Component

Step 1: Prepare a substrate, and form a first internal electrode and a second internal electrode on the top surface of the substrate through screen printing or electroplating, and then dry them; wherein the substrate is an alumina ceramic substrate, and the The first internal electrode and the second internal electrode are both silver-palladium alloy electrodes.

Step 2: Form an antistatic protective layer on part of the first internal electrode, part of the second internal electrode and part of the substrate through screen printing, and sinter at 400 ^○ C to 700 ^○ C to The antistatic protective layer is fixed on the first internal electrode, the second internal electrode and the substrate; wherein, based on the total weight of the antistatic protective layer, the antistatic protective layer It contains 15 weight percent of platinum, 60 weight percent of nickel carbide and 25 weight percent of filler; wherein, the filler is the first commercially available glass, and the ingredients include zinc oxide (ZnO), aluminum oxide (Al ₂ O ₃ ), Silicon oxide (SiO ₂ ) and calcium carbonate (CaCO ₃ ), and the product label shows that the transition point of the first commercial glass is 587 ^○ C to 627 ^○ C; the deformation point is 667 ^○ C to 707 ^○ C; and the line The expansion coefficient is 56*10 ^-7 / ^○ C to 64*10 ^-7 / ^○ C.

Step 3: Form a barrier layer through screen printing to cover all of the antistatic protective layer, part of the first internal electrode, part of the second internal electrode and part of the substrate.

Step 4: Form a first insulating protective layer through screen printing to cover all of the barrier layer, part of the first internal electrode, part of the second internal electrode and part of the substrate, and heat it at 400 ^○ C to 510 ^○ C for sintering; wherein the material used for the first insulating protective layer includes the above-mentioned first commercially available glass.

Step 5: Form a second insulating protective layer through screen printing to cover all of the first insulating protective layer, part of the first internal electrode, part of the second internal electrode and part of the substrate, and Heating is performed at 100 ^○ C to 300 ^○ C to obtain a half finished product; wherein the second insulating protective layer contains epoxy.

Step 6: Form a first external electrode and a second external electrode respectively on the opposite sides of the semi-finished product through dipping and electroplating, and the first external electrode is electrically connected to the first internal electrode, and the The second external electrode is electrically connected to the second internal electrode to obtain a finished antistatic protection element as shown in Figure 3; wherein the first external electrode and the second external electrode are both three-layer Structure: The electrode materials of the first to third layers (from the inside out) are silver, nickel and tin in order.

Finally, terpineol and ethyl cellulose are added to the raw materials of the antistatic protective layer, barrier layer and first insulating protective layer to facilitate the mixing and adhesion of the raw materials, and the terpineol and ethyl cellulose are removed during the sintering process. .

Preparation Example 2: Antistatic Protection Component

Step 1: Prepare a substrate, form a first internal electrode on the top surface of the substrate through screen printing or electroplating, and then dry it; wherein the substrate is an alumina ceramic substrate, and the first internal electrode is silver. Palladium alloy electrode.

Step 2: Form an antistatic protective layer on part of the first internal electrode and part of the substrate through screen printing, and sinter at 400 ^○ C to 700 ^○ C to make the antistatic protective layer solid. Adhered to the first internal electrode and the substrate; wherein, the antistatic protective layer is the same as Preparation Example 1.

Step 3: Form a second internal electrode on part of the antistatic protective layer and part of the substrate through screen printing or electroplating and then dry it to obtain an antistatic protection element structure as shown in Figure 2; wherein , the second internal electrode is a silver-palladium alloy electrode.

Steps 4 to 7: Follow steps 3 to 6 of Preparation Example 1, respectively, to sequentially form a barrier layer, a first insulating protective layer and a second insulating protective layer on the first internal electrode, the antistatic protective layer and the second internal electrode. And forming a first external electrode and a second external electrode respectively on two opposite sides of the semi-finished product.

Test Example 1: Anti-static shock test

Test Example 1 includes Comparative Example A, Example A and Example B, and each group contains 20 finished products. The differences in each group are shown in Table 1.

Table 1: Description of differences among Comparative Example A, Example A and Example B Group Difference description Comparative example A The finished product of the antistatic protection element of Preparation Example 1 is similar, but the difference is that Comparative Example A does not provide a barrier layer (that is, step 3 is omitted). Example A The finished product of the antistatic protection element prepared by the method of Preparation Example 1, and based on the total weight of the barrier layer, the barrier layer (firing temperature is 510 ^○ C) contains: 20% by weight of aluminum oxide (Al ₂ O ₃ ) and 80 weight percent of the first glass material. Example B The finished product of the antistatic protection element prepared by the method of Preparation Example 1, and based on the total weight of the barrier layer, the barrier layer (firing temperature is 510 ^○ C) contains: 83% by weight of aluminum oxide (Al ₂ O ₃ ) and 17 weight percent of the first glass material.

The first glass material of the above-mentioned barrier layer is the second commercially available glass. Its composition includes bismuth trioxide (Bi ₂ O ₃ ), diboron trioxide (B ₂ O ₃ ) and zinc oxide (ZnO), and the product label shows The second glass has a softening point of 433 ^○ C, a firing temperature of 480 ^○ C to 500 ^○ C, a glass transition temperature of 363 ^○ C, and a diameter of 3 to 4.5 microns.

Test method:

The first stage: Each group is tested according to the electrostatic discharge immunity test standard of IEC61000-4-2; among them, the test voltage of contact discharge is set to 15 kilovolts (kV), and each finished product in each group is provided Perform forward and reverse electrostatic discharge shocks 100 times each, and check the appearance of each finished product in each group. If no breakdown occurs, mark O. On the contrary, if breakdown does occur, mark X. The test results of each group are recorded in Table 2.

After that, each finished product in each group is provided with a maximum continuous working voltage (Maximum allowable continuous DC voltage, Vdc) of 12 V, and the leakage current is measured with a Keithley meter, and two situations are distinguished: (1) When the measured When the measured leakage current ≦10 μA, mark it as O, which means that the finished product has not been damaged by electrostatic discharge impact and does not cause leakage current problems; (2) When the measured leakage current >10 μA, mark it If it is The test results of each group are recorded in Table 2; among them, the average leakage current is the average leakage current measured by the 20 finished products in each group; and the maximum leakage current is the average leakage current measured by the 20 finished products in each group. The maximum value of the measured leakage current.

Table 2: Electrostatic discharge immunity test results of Comparative Example A, Example A and Example B Group Comparative example A Example A Example B Finished product number Appearance Leakage current Appearance Leakage current Appearance Leakage current 1 O O O O O O 2 O O O O O O 3 O O O O O O 4 O O X O O O 5 O O O O O O 6 X X O O O O 7 X O O O O O 8 X O O O O O 9 X O O O O O 10 O O X X O O 11 O O X O O O 12 X O O O O O 13 O O O O O O 14 O O O O O O 15 O O O O O O 16 O O X O O O 17 X O O O O O 18 O O O O O O 19 O O O O O O 20 X O X X O O average current -- 0.7μA -- 3.5 μA -- 0.13μA Maximum current -- 12.7 μA -- 20.1μA -- 1.2μA

From the experimental results in Table 2, it can be seen that the breakdown rate of Comparative Example A is 35%, the breakdown rate of Example A is 25%, and the breakdown rate of Example B is 0%. It can be seen that the breakdown rate of Example A and Example B is It is equipped with a barrier layer, so the breakdown rate can be reduced, which means the risk of internal explosion of the anti-static protection element is reduced.

In addition, it can be seen from the difference in breakdown rate and current between Example A and Example B that when the content of the ceramic material (ie, alumina) is greater than 50% by weight, the breakdown rate can be further significantly reduced, that is, the anti-static protection can be significantly reduced. Reduce the risk of internal component explosion and avoid leakage current problems.

Finally, the reason for the breakdown of the appearance of the finished product is that the anti-static protective layer failed to conduct the energy of electrostatic discharge in time, causing the first insulating protective layer to burst. Although the anti-static protective layer did not burst, the anti-static protective layer The layers may still be damaged at the same time, and the loop connected to the finished product of the present invention cannot be maintained in an open circuit state, that is, the low current state of the loop can be maintained, resulting in subsequent leakage current problems. Therefore, adding a barrier layer in the present invention can improve the structural strength of the anti-static protection element to reduce the breakdown rate, thereby improving the anti-static shock resistance, reliability and durability of the anti-static protection element in the present invention.

Second stage:

Based on the excellent test results of Example B in the first stage, the 20 finished products of Example B were further subjected to more forward and reverse electrostatic discharge impact tests (200 times each and 500 times each). The remaining test methods were the same. In the first stage, the results are explained in Table 3:

Table 3: Electrostatic discharge immunity test results of Example B Test conditions 200 times of forward and reverse electrostatic discharge shocks 500 forward and reverse electrostatic discharge shocks each Breakdown rate 0% 0% average current 0.28μA 0.055μA Maximum current 2.74 μA 0.65μA

It can be seen from the results in Table 3 that even if Example B withstands electrostatic discharge shocks up to 500*2=1000 times, it can still operate normally.

Finally, the 20 finished products based on Comparative Example A, Example A and Example B were able to withstand 10 forward and reverse electrostatic discharge impacts each, that is, the breakdown rates of Comparative Example A, Example A and Example B were all the same. is 0%, and the average current and maximum current of each group are both ≦10 μA, so no additional experimental data is provided.

In summary, the number of electrostatic discharge shocks that Comparative Example A and Embodiment A can withstand is at least 10*2=20 times. Furthermore, since Embodiment A further provides a barrier layer, the risk of internal explosion of the anti-static protection element can be reduced, that is, the breakdown rate can be reduced. In Example B, after further adjusting the formula of the barrier layer (that is, the content of the ceramic material contained in the barrier layer is greater than 50% by weight), the number of anti-static discharge shocks of the anti-static protection element is increased from 20 times to at least 1000 times. That is to say, the anti-static protection element can still operate normally even after experiencing 1,000 times of 15 kV electrostatic shocks without breakdown or derived leakage current problems, thereby improving the anti-static shock resistance of the anti-static protection element of the present invention. , reliability and durability.

1: Anti-static protection components

10:Substrate

100:Top surface

101: Bottom

11: First internal electrode

110: Side 1

111:Second side

102A,102B: Side

12: Second internal electrode

120: First side

121:Second side

13: Antistatic protective layer

130: Side 1

131:Second side

14: Barrier layer

15: First insulation protective layer

16: Second insulation protective layer

17: First external electrode

18: Second external electrode

Figure 1 is a schematic diagram of Embodiment 1 of the present invention.

Figure 2 is a schematic diagram of Embodiment 2 of the present invention.

Figure 3 is a schematic diagram of Embodiment 3 of the present invention.

without

1: Anti-static protection components

10:Substrate

100:Top surface

101: Bottom

11: First internal electrode

12: Second internal electrode

13: Antistatic protective layer

14: Barrier layer

Claims (9)

An antistatic protection component, which includes a substrate, a first internal electrode, a second internal electrode, an antistatic protection layer and a barrier layer; wherein the substrate has an opposite top surface and a bottom surface; the The first internal electrode and the second internal electrode are respectively disposed on the top surface of the substrate, and there is a gap between the first internal electrode and the second internal electrode; the antistatic protective layer is disposed on the top surface of the substrate. The top surface of the substrate is located between the first internal electrode and the second internal electrode, the antistatic protective layer is in contact with the first internal electrode and the second internal electrode respectively; and the The barrier layer covers the antistatic protective layer; wherein the firing temperature of the antistatic protective layer is higher than the firing temperature of the barrier layer, and the barrier layer includes a porous structure, and the barrier layer includes ceramics material and the first glass material, and based on the total weight of the barrier layer, the content of the ceramic material is greater than 50 weight percent. The antistatic protection element according to claim 1, wherein the antistatic protection layer covers the first internal electrode, and the second internal electrode covers the antistatic protection layer. The antistatic protection element according to claim 1, wherein the ceramic material includes any one of aluminum oxide, silicon carbide, silicon nitride and aluminum nitride or a combination thereof. The antistatic protection element according to claim 1, wherein the first glass material includes bismuth trioxide, boron trioxide and zinc oxide. The antistatic protection element according to claim 1, wherein based on the total weight of the barrier layer, the content of the ceramic material is greater than 50 weight percent and less than or equal to 83 weight percent, and the first glass material The content is greater than or equal to 17 weight percent and less than 50 weight percent. The antistatic protection element according to claim 1, wherein the barrier layer further includes glass fiber, and the length of the glass fiber is 100 microns to 200 microns. The antistatic protection element according to claim 1, wherein the antistatic protection element further includes at least one insulating protective layer, and the at least one insulating protective layer covers the barrier layer; wherein the at least one insulating protective layer The layer contains a third glass material or polymer material. The antistatic protection element according to claim 7, wherein the at least one insulating protective layer includes a first insulating protective layer and a second insulating protective layer; the first insulating protective layer covers the barrier layer; The second insulating protective layer covers the first insulating protective layer; wherein the first insulating protective layer includes a third glass material; the second insulating protective layer includes a polymer material, and the polymer material includes a ring Any one or combination of oxygen resin, silicone resin and phenolic resin. The antistatic protection component according to claim 1, wherein the antistatic protection component further includes a first external electrode and a second external electrode; wherein the first external electrode and the second external electrode respectively Disposed on opposite sides of the substrate, the first external electrode is electrically connected to the first internal electrode, and the second external electrode is electrically connected to the second internal electrode.

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