Double-sided enamel ceramic ozone generator dielectric sheet

Abstract

The utility model belongs to ozone generating equipment technical field discloses a kind of double-faced glaze ceramic ozone generator dielectric sheet, including ceramic substrate, still including the printed sintering conductive silver layer above ceramic substrate, the first glass glaze layer covering conductive silver layer and the second glass glaze layer being set to substrate other side, conductive silver layer is equipped with solder point area;Solder point area is exposed to the surface of first glass glaze layer, outer periphery forms annular insulating groove, limit platform is coaxially arranged outside groove;Conductive silver layer is equipped with hierarchical transition layer between first glass glaze layer;Ceramic substrate perimeter is equipped with composite edge band, and composite edge band includes step insulating band.The utility model has the effect of limiting solder diffusion and electric breakdown, improves the voltage resistance of dielectric sheet, and also can improve heat exchange, so that discharge temperature is more stable under water cooling condition.

Description

Technical Field

[0001] This utility model belongs to the technical field of ozone generating equipment, and relates to a single-sided conductive ceramic ozone generator dielectric sheet with double-sided glaze protection for plate ozone generators. Background Technology

[0002] Ozone generators are widely used in water treatment, air purification, and food preservation. In traditional plate-type ozone generators, the dielectric sheet is usually made of glass or ceramic. Ceramic dielectrics have advantages such as high dielectric constant, high temperature resistance, and good insulation properties, but they still have some problems under long-term high-voltage discharge environments.

[0003] The conductive layer is typically formed using screen-printed silver paste. Silver has high chemical reactivity and is easily oxidized under high temperature and humidity conditions, leading to decreased conductivity and reduced discharge efficiency. The significant difference in thermal expansion coefficients between the ceramic substrate and the glass glaze layer makes them prone to stress cracking during repeated thermal cycling, causing the glaze layer to peel off or crack. Without anti-diffusion design in the solder joint area, solder may overflow into the insulating area during high-temperature soldering, causing electrical breakdown.

[0004] The electric field concentration at the edges of the ceramic sheet is a major potential cause of breakdown; poor contact between the back side and the water-cooling plate can lead to localized temperature increases, affecting the stability of ozone generation. A ceramic dielectric sheet is needed that can structurally address the problems of conductive layer oxidation, glaze cracking, solder diffusion, and edge breakdown simultaneously.

[0005] Based on this, this utility model designs a single-sided conductive ceramic ozone generator dielectric sheet with double-sided glaze protection to solve the above problems. Utility Model Content

[0006] The purpose of this invention is to provide a dielectric sheet for a double-sided glazed ceramic ozone generator, thereby solving the problems in the prior art.

[0007] To solve the above-mentioned technical problems, this utility model is achieved through the following technical solution: A dielectric sheet for a double-sided glazed ceramic ozone generator includes a ceramic substrate, a conductive silver layer printed and sintered on the ceramic substrate, a first glass glaze layer covering the conductive silver layer, and a second glass glaze layer disposed on the other side of the substrate. The conductive silver layer has solder joint areas. An annular insulating trench is formed around the solder joint areas, and a limiting stage is coaxially disposed on the outside of the trench. A graded transition layer is provided between the conductive silver layer and the first glass glaze layer. A composite edge band is provided around the perimeter of the ceramic substrate, and the composite edge band includes a stepped insulating band.

[0008] To better achieve the desired technical effect, further steps are needed: The depth of the annular insulating groove is 5-30μm, and the height of the limiting stage is 10-50μm.

[0009] The hierarchical transition layer consists of a low-expansion glass sublayer and a microcrystalline ceramic sublayer.

[0010] A micro-rib heat dissipation array is formed on the outer surface of the second glass glaze layer.

[0011] The solder joint area is an independent solid pad, which is connected to the main body of the conductive silver layer through the neck. The silver lines of the conductive silver layer are in the form of a grid or concentric rings, and the width of the silver lines is 0.3-1.0 mm.

[0012] This utility model has the following beneficial effects: 1. By setting an annular insulating groove and a limiting stage, the diffusion of solder can be restricted and electrical breakdown can be prevented; 2. By setting a graded transition layer, a transition in the coefficient of thermal expansion is formed between the conductive layer and the glaze layer, which improves the interfacial bonding force and relieves thermal stress. 3. By extending the electric field creepage path through composite sidebands, the electric field concentration caused by right angles or sharp edges is avoided, thereby improving withstand voltage performance; 4. The heat exchange is improved by the micro-convex rib heat dissipation array of the second glass glaze layer, making the discharge temperature more stable under water cooling conditions. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the overall structure; Figure 2 Schematic diagram of cross-section structure Figure 3 This is a top-down structural diagram.

[0014] The following are the labels in the diagram: 1. Ceramic substrate; 2. Conductive silver layer; 3. First glass glaze layer; 4. Second glass glaze layer; 5. Solder joint area; 6. Low-expansion glass sublayer; 7. Microcrystalline ceramic sublayer; 8. Annular groove; 9. Limiting stage; 10. Composite side strip; 11. Micro-convex rib heat dissipation array; 12. Neck; 13. Stepped insulating strip. Detailed Implementation

[0015] like Figure 1 As shown, the dielectric sheet consists of a ceramic substrate 1, a conductive silver layer 2, a first glass glaze layer 3, a second glass glaze layer 4, and a solder joint area 5. The ceramic substrate 1 is alumina ceramic with a thickness ranging from 0.5 to 2.0 mm, and its surface is precision polished to achieve a surface roughness of less than or equal to 0.5 μm.

[0016] A conductive silver layer 2 is sintered on top of the ceramic substrate 1. The conductive silver layer 2 can be produced using screen printing. The silver paste used for printing has a silver content of ≥80%, and 1-3% glass powder is added to the silver paste as a binder phase. The silver lines in the conductive silver layer 2 are arranged in a grid or concentric rings, with a line width of 0.3-1.0 mm. After printing, it is sintered at 600-800℃ for 20-40 minutes to ensure a strong bond between the silver layer and the ceramic. A solder joint area 5 is retained in the center of the conductive silver layer 2. The solder joint area 5 is a solid disc-shaped region with a diameter of 2-5 mm, used for soldering high-voltage conductors.

[0017] An annular insulating trench 8 with a depth of 5-30 μm and a width of 0.2-0.8 mm is formed around the outer periphery of the solder joint area 5. A limiting stage 9 with a height of 10-50 μm is set on the outer side of the annular insulating trench 8. The annular insulating trench 8 and the limiting stage 9 are used to block the flow of solder. The solder joint area 5 is an independent solid pad, which is connected to the main body of the conductive silver layer 2 through the neck 12. A low-expansion glass sublayer 6 is sintered on top of the conductive silver layer 2, and a microcrystalline ceramic sublayer 7 is sintered on top of the low-expansion glass sublayer 6. The two are collectively called the graded transition layer, with a total thickness of 5-25 μm. The difference in the coefficient of thermal expansion between ceramic and glass glaze is the cause of glaze cracking or peeling. The coefficient of linear expansion of the graded transition layer decreases stepwise along the thickness direction. The low-expansion glass sublayer 6 and the microcrystalline ceramic sublayer 7 can be used as intermediate media to buffer internal stress. The thickness of the first glass glaze layer 3 is 10-30 μm. A transparent or semi-transparent lead-free glaze is used to observe the state of the conductive silver layer 2. The second glass glaze layer 4 is disposed on the back side of the ceramic substrate 1. The open end of the second glass glaze layer 4 has a regular micro-protrusion rib heat dissipation array 11 with a spacing of 0.5-2.0 mm and a height of 20-80 μm.

[0018] The ceramic substrate 1 has a composite edge strip 10 around its four edges. The composite edge strip 10 includes a stepped insulating strip 13 with a step width of 0.1-0.5 mm. The outer edge of the stepped insulating strip 13 is rounded. The second glass glaze layer 4 on the back of the ceramic substrate 1 covers the stepped area of ​​the composite edge strip 10.

[0019] Performance testing: Performed according to GB / T 1408.1-2016 "Test Method for Electrical Strength of Solid Insulating Materials" and IEC 60243 standard. Under an environment of 25℃ and 60% relative humidity, the dielectric sheet of this invention showed no discharge marks after being discharged at 20kV AC for 1000 hours. The breakdown voltage increased by 10-15%, the thermal cycle life was extended by 50%, and no solder overflow occurred. It can be used in high-concentration ozone output equipment and achieves the expected results.

[0020] The preferred embodiments of the present invention disclosed above are only used to help illustrate the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the present invention to specific implementation methods.

Claims

1. A dielectric sheet for a double-sided glazed ceramic ozone generator, comprising a ceramic substrate (1), characterized in that: It also includes a printed and sintered conductive silver layer (2) on top of the ceramic substrate (1), a first glass glaze layer (3) covering the conductive silver layer (2), and a second glass glaze layer (4) disposed on the other side of the substrate. The conductive silver layer (2) is provided with a solder joint area (5). The solder joint area (5) is exposed on the surface of the first glass glaze layer (3), and an annular insulating groove (8) is formed on its outer periphery. A limiting platform (9) is coaxially disposed on the outside of the groove. A graded transition layer is provided between the conductive silver layer (2) and the first glass glaze layer (3). A composite edge band (10) is provided around the periphery of the ceramic substrate. The composite edge band (10) includes a stepped insulating band (13).

2. The dielectric sheet for a double-sided glazed ceramic ozone generator according to claim 1, characterized in that: The depth of the annular insulating groove is 5-30μm, and the height of the limiting stage (9) is 10-50μm.

3. The dielectric sheet for a double-sided glazed ceramic ozone generator according to claim 1, characterized in that: The graded transition layer consists of a low-expansion glass sublayer (6) and a microcrystalline ceramic sublayer (7).

4. The dielectric sheet for a double-sided glazed ceramic ozone generator according to claim 1, characterized in that: The outer surface of the second glass glaze layer (4) forms a micro-convex rib heat dissipation array (11).

5. The dielectric sheet for a double-sided glazed ceramic ozone generator according to claim 1, characterized in that: The solder joint area (5) is an independent solid solder pad, which is connected to the main body of the conductive silver layer (2) through the neck (12). The silver lines of the conductive silver layer (2) are in the form of a grid or concentric rings, and the width of the silver lines is 0.3-1.0 mm.

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