A ceramic and metal connecting structure with detachable function

Abstract

The utility model relates to a kind of ceramic and metal connecting structure with detachable function, including metal top disc, metal bottom disc, ceramic tube and several heterogeneous bolts, metal top disc, metal bottom disc and ceramic tube coaxially stack, ceramic tube is located between metal top disc and metal bottom disc, the end face of metal top disc and metal bottom disc is equipped with several through holes, heterogeneous bolt is sequentially passed through the through hole of metal bottom disc and the through hole of metal top disc, ceramic tube circumference and heterogeneous bolt circumference gap, heterogeneous bolt is coaxially brazed by metal fixing rod and ceramic fixing rod, the end of heterogeneous bolt is threadedly connected with nut, the top end and bottom end of ceramic tube are equipped with annular groove.The utility model is good sealing at different temperatures, in addition, it is easy to disassemble, replace parts, so as to greatly reduce its manufacturing, use cost.

Description

Technical Field

[0001] This utility model relates to the field of solid oxide fuel cell technology, and specifically to a ceramic-metal connection structure with detachable functionality. Background Technology

[0002] Ceramic materials possess excellent physical and chemical properties such as high-temperature resistance, corrosion resistance, wear resistance, and high insulation, playing a vital role in modern societal development. However, due to their high brittleness, ceramics are difficult to process into complex and precise structures, thus often requiring bonding with metals. From the perspective of bonding methods, ceramic-metal bonding can be divided into physical bonding and chemical bonding. Physical bonding includes mechanical bonding and adhesive bonding, while chemical bonding includes brazing, solid-phase diffusion bonding, transient liquid-phase diffusion bonding, and self-propagating high-temperature welding.

[0003] In fields such as nuclear energy and chemical engineering, ceramic-metal connectors need to operate for extended periods in high-temperature environments containing corrosive or special gases, posing significant challenges to their lifespan performance. The connection points, in particular, are not only stress concentration points but also vulnerable to gas corrosion, making them a primary cause of sealing failure. Currently, brazing is a widely used technique for joining ceramics and metals; however, this technique often results in the inability to disassemble or replace the connector when performance fails at the connection point. Therefore, in harsh environments such as high temperatures, precious metal brazing fillers (gold-based, platinum-based, etc.) are typically used to connect metals and ceramics to ensure a longer lifespan for the connection points, but this leads to prohibitively high costs. Utility Model Content

[0004] The purpose of this invention is to provide a ceramic-metal connection structure with a detachable function, which has good sealing performance at different temperatures. In addition, it is easy to disassemble and replace parts, thereby greatly reducing its manufacturing and usage costs.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A detachable ceramic-metal connection structure includes a metal top plate, a metal base plate, a ceramic tube, and several dissimilar bolts. The metal top plate, metal base plate, and ceramic tube are coaxially stacked, with the ceramic tube positioned between the metal top plate and the metal base plate. Both the metal top plate and the metal base plate have several through holes on their end faces. The dissimilar bolts pass sequentially through the through holes in the metal base plate and the metal top plate. A gap exists between the circumference of the ceramic tube and the circumference of the dissimilar bolts. The dissimilar bolts are formed by coaxially brazing a metal fixing rod and a ceramic fixing rod. The ends of the dissimilar bolts are threaded together. The ceramic tube is fitted with a nut. Both the top and bottom ends of the ceramic tube have annular grooves. The bottom wall of the metal top plate has annular grooves. The annular grooves on the bottom wall of the metal top plate and the top wall of the ceramic tube are positioned corresponding to each other and are fitted together with a sealing ring, leaving a gap between the bottom wall of the metal top plate and the top wall of the ceramic tube. The top wall of the metal bottom plate has annular grooves. The annular grooves on the top wall of the metal bottom plate and the bottom wall of the ceramic tube are positioned corresponding to each other and are fitted together with a sealing ring, leaving a gap between the top wall of the metal bottom plate and the bottom wall of the ceramic tube.

[0007] Specifically, the top end of the metal fixing rod is threaded, the bottom end of the metal fixing rod is countersunk, the top end of the ceramic fixing rod matches the countersunk of the metal fixing rod, the top end of the ceramic fixing rod and the countersunk of the metal fixing rod are brazed by copper-tin-titanium brazing filler metal or nickel-based brazing filler metal, and the bottom end of the ceramic fixing rod is provided with a base plate.

[0008] Specifically, the metal retaining rod is made of stainless steel, nickel-based high-temperature alloy or iron-chromium-aluminum alloy, while the ceramic retaining rod is made of aluminum nitride, silicon nitride, silicon carbide, aluminum nitride or silicon nitride or silicon carbide.

[0009] Specifically, the end faces of both the metal top plate and the metal bottom plate are provided with four to eight through holes, which are evenly distributed along the circumference.

[0010] Specifically, the metal top plate and metal bottom plate are made of stainless steel, nickel-based high-temperature alloy or iron-chromium-aluminum alloy, and the ceramic tube is made of zirconia ceramic, alumina ceramic, yttrium oxide ceramic or magnesium olivine.

[0011] Specifically, the sealing ring is a nickel ring, copper ring, silver ring, graphite sealing ring, or vermiculite sealing ring, and the sealing ring is flexible.

[0012] Specifically, the radial width of the sealing ring is smaller than the radial width of the annular groove, and the axial thickness of the sealing ring is greater than the sum of the axial thicknesses of the annular grooves on its upper and lower sides.

[0013] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0014] I. The designed ceramic-metal connector uses a flexible material such as pure nickel as the sealing layer (sealing ring 3). As the temperature of the connector rises, the difference in thermal expansion between the dissimilar bolt and the sealing ring 3 is utilized: during the same heating process, the axial thermal expansion of the dissimilar bolt is less than the sum of the axial thermal expansions of the metal top plate 1, the metal bottom plate 2, the sealing ring 3, and the ceramic tube 4. This allows the dissimilar bolt to provide sufficient axial locking force to the metal bottom plate 2, the ceramic tube 4, and the metal top plate 1, thereby ensuring the sealing performance at the sealing ring 3 and enabling the ceramic-metal connector to have good sealing performance at different temperatures.

[0015] Second, unlike ceramic-metal connectors that use brazing or bonding, the dissimilar bolts and sealing modules (metal base 2, ceramic tube 4, and metal top plate 1) of this utility model, as well as the sealing parts (groove and sealing ring 3) within the sealing module, are all mechanically connected. This achieves insulation and sealing functions while also providing a detachable design, greatly improving flexibility. Furthermore, the reusability of the ceramic-metal connector is achieved by easily replacing the sealing layer, significantly reducing manufacturing and usage costs.

[0016] Third, the combination of metal fixing rod 5 and ceramic fixing rod 6 in the dissimilar bolt effectively utilizes the advantages of both materials, avoiding the drawbacks of using only metal or ceramic materials. On one hand, the ceramic fixing rod 6 reduces the overall thermal expansion coefficient of the dissimilar bolt, ensuring that its thermal expansion at high temperatures is less than that of the sealing module (metal base 2, ceramic tube 4, and metal top plate 1), thus guaranteeing a tight connection between the dissimilar bolt and the sealing module at high temperatures. Furthermore, the ceramic fixing rod 6 provides overall insulation for the dissimilar bolt. On the other hand, the metal fixing rod 5 can achieve a simple yet tight connection between the dissimilar bolt and the sealing module through designs such as threaded structures. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 A half-section view of the ceramic-metal connection structure;

[0019] Figure 2 A schematic diagram showing the combination of the metal fixing rod 5 and the ceramic fixing rod 6;

[0020] Figure 3Top view and sectional view of the metal top plate and metal base plate;

[0021] Figure 4 This is a half-section view of the ceramic tube.

[0022] In the picture:

[0023] 1. Metal top plate; 2. Metal base plate; 3. Sealing ring; 4. Ceramic tube; 5. Metal fixing rod; 6. Ceramic fixing rod; 7. Nut. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0025] See Figures 1 to 4 A ceramic-metal connection structure with detachable functionality includes a metal top plate 1, a metal base plate 2, a ceramic tube 4, and several dissimilar bolts (see...). Figure 2 Metal top plate 1, metal bottom plate 2, and ceramic tube 4 are coaxially stacked. Ceramic tube 4 is positioned between metal top plate 1 and metal bottom plate 2. Both metal top plate 1 and metal bottom plate 2 have several through holes on their end faces (see...). Figure 3 The dissimilar bolts pass sequentially through the through holes in the metal base plate 2 and the metal top plate 1. A gap is left between the circumference of the ceramic tube 4 and the circumference of the dissimilar bolts.

[0026] The dissimilar bolt is made by coaxial brazing of a metal retaining rod 5 and a ceramic retaining rod 6 (see...). Figure 2 The end of the heterogeneous bolt is threaded with a nut 7. Both the top and bottom of the ceramic tube 4 are provided with annular grooves (see...). Figure 4 The bottom wall of the metal top plate 1 is provided with an annular groove, which corresponds to the annular groove on the top wall of the ceramic tube 4, and together they clamp a sealing ring 3, leaving a gap between the bottom wall of the metal top plate 1 and the top wall of the ceramic tube 4 (see...). Figure 1 The top wall of the metal chassis 2 is provided with an annular groove. The annular groove on the top wall of the metal chassis 2 corresponds to the annular groove on the bottom wall of the ceramic tube 4, and together they are fitted with a sealing ring 3, so that there is a gap between the top wall of the metal chassis 2 and the bottom wall of the ceramic tube 4.

[0027] Specifically, the top end of the metal fixing rod 5 is threaded, and the bottom end of the metal fixing rod 5 is countersunk (for connection). Figure 2 The top end of the ceramic fixing rod 6 matches the countersunk hole of the metal fixing rod 5, and the top end of the ceramic fixing rod 6 and the countersunk hole of the metal fixing rod 5 are brazed together using copper-tin-titanium brazing filler metal or nickel-based brazing filler metal. The bottom end of the ceramic fixing rod 6 is provided with a base plate.

[0028] Specifically, the metal fixing rod 5 is made of stainless steel, nickel-based high-temperature alloy or iron-chromium-aluminum alloy, and the ceramic fixing rod 6 is made of aluminum nitride, silicon nitride, silicon carbide, aluminum nitride or silicon nitride or silicon carbide.

[0029] Specifically, the end faces of both the metal top plate 1 and the metal bottom plate 2 are provided with four to eight through holes, which are evenly distributed along the circumference.

[0030] Specifically, the metal top plate 1 and the metal base plate 2 are made of stainless steel, nickel-based high-temperature alloy, or iron-chromium-aluminum alloy. The ceramic tube 4 is made of zirconia ceramic, alumina ceramic, yttrium oxide ceramic, or magnesium olivine.

[0031] Specifically, the sealing ring 3 is a nickel ring, copper ring, silver ring, graphite sealing ring, or vermiculite sealing ring, and the sealing ring 3 is flexible.

[0032] Specifically, the radial width of the sealing ring 3 is smaller than the radial width of the annular groove, and the axial thickness of the sealing ring 3 is greater than the sum of the axial thicknesses of the annular grooves on its upper and lower sides.

[0033] The assembly process of this utility model is as follows:

[0034] Copper-tin-titanium brazing filler metal is applied to the countersunk hole of the metal retaining rod 5 and the tip of the ceramic retaining rod 6, respectively. Then, the tip of the ceramic retaining rod 6 coated with brazing filler metal is inserted into the countersunk hole of the metal retaining rod 5, and the fitted retaining rod is placed in a vacuum brazing furnace. First, the brazing furnace is evacuated to a vacuum level of 10. -4 -10 -5 Then, heat the material to 450℃ at a rate of 5℃ / min and hold for 15-20 minutes. Immediately afterward, heat it to 900℃ and hold for 5-15 minutes. After cooling, remove the material to obtain the heterogeneous bolt.

[0035] Taking sealing ring 3 as a pure nickel sealing ring as an example: Place the pure nickel sealing ring in a vacuum furnace, and evacuate the vacuum furnace to a vacuum degree of 10. -4 -10 -5 The temperature is increased to 900℃ at a rate of 5℃ / min and held for 5-10 minutes. After natural cooling, it is removed for later use. The purpose is to improve the flexibility of the pure nickel sealing ring, thereby enhancing the compatibility of the pure nickel sealing ring as a sealing layer with metals and ceramics.

[0036] The metal base plate 2, ceramic tube 4 and metal top plate 1 are stacked in sequence, so that the groove on the top wall of the metal base plate 2 and the groove on the bottom wall of the ceramic tube 4 together clamp the pure nickel sealing ring (sealing ring 3), and the groove on the top wall of the ceramic tube 4 and the groove on the bottom wall of the metal top plate 1 together clamp the pure nickel sealing ring (sealing ring 3). Then, multiple dissimilar bolts are used to fasten the metal base plate 2, ceramic tube 4 and metal top plate 1 to form a seal at the pure nickel sealing ring (sealing ring 3).

[0037] The beneficial effects of this utility model are as follows:

[0038] I. The designed ceramic-metal connector uses a flexible material such as pure nickel as the sealing layer (sealing ring 3). As the temperature of the connector rises, the difference in thermal expansion between the dissimilar bolt and the sealing ring 3 is utilized: during the same heating process, the axial thermal expansion of the dissimilar bolt is less than the sum of the axial thermal expansions of the metal top plate 1, the metal bottom plate 2, the sealing ring 3, and the ceramic tube 4. This allows the dissimilar bolt to provide sufficient axial locking force to the metal bottom plate 2, the ceramic tube 4, and the metal top plate 1, thereby ensuring the sealing performance at the sealing ring 3 and enabling the ceramic-metal connector to have good sealing performance at different temperatures.

[0039] Second, unlike ceramic-metal connectors that use brazing or bonding, the dissimilar bolts and sealing modules (metal base 2, ceramic tube 4, and metal top plate 1) of this utility model, as well as the sealing parts (groove and sealing ring 3) within the sealing module, are all mechanically connected. This achieves insulation and sealing functions while also providing a detachable design, greatly improving flexibility. Furthermore, the reusability of the ceramic-metal connector is achieved by easily replacing the sealing layer, significantly reducing manufacturing and usage costs.

[0040] Third, the combination of metal fixing rod 5 and ceramic fixing rod 6 in the dissimilar bolt effectively utilizes the advantages of both materials, avoiding the drawbacks of using only metal or ceramic materials. On one hand, the ceramic fixing rod 6 reduces the overall thermal expansion coefficient of the dissimilar bolt, ensuring that its thermal expansion at high temperatures is less than that of the sealing module (metal base 2, ceramic tube 4, and metal top plate 1), thus guaranteeing a tight connection between the dissimilar bolt and the sealing module at high temperatures. Furthermore, the ceramic fixing rod 6 provides overall insulation for the dissimilar bolt. On the other hand, the metal fixing rod 5 can achieve a simple yet tight connection between the dissimilar bolt and the sealing module through designs such as threaded structures.

[0041] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with reference to preferred embodiments, it is not intended to limit the present utility model. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present utility model. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present utility model without departing from the scope of the present utility model shall still fall within the scope of the present utility model.

Claims

1. A ceramic-metal connection structure with detachable functionality, characterized in that: The device includes a metal top plate, a metal base plate, a ceramic tube, and several dissimilar bolts. The metal top plate, metal base plate, and ceramic tube are coaxially stacked, with the ceramic tube positioned between the metal top plate and the metal base plate. Both the metal top plate and the metal base plate have several through holes on their end faces. The dissimilar bolts pass sequentially through the through holes in the metal base plate and the metal top plate. A gap exists between the circumference of the ceramic tube and the circumference of the dissimilar bolts. The dissimilar bolts are formed by coaxially brazing a metal fixing rod and a ceramic fixing rod. A nut is threaded onto the end of each dissimilar bolt. The top of the ceramic tube... Both the top and bottom ends are provided with annular grooves. The bottom wall of the metal top plate is provided with annular grooves. The annular grooves on the bottom wall of the metal top plate and the annular grooves on the top wall of the ceramic tube are positioned to correspond to each other and are jointly clamped with a sealing ring, so that there is a gap between the bottom wall of the metal top plate and the top wall of the ceramic tube. The top wall of the metal bottom plate is provided with annular grooves. The annular grooves on the top wall of the metal bottom plate and the annular grooves on the bottom wall of the ceramic tube are positioned to correspond to each other and are jointly clamped with a sealing ring, so that there is a gap between the top wall of the metal bottom plate and the bottom wall of the ceramic tube.

2. The ceramic-metal connection structure with detachable function according to claim 1, characterized in that: The top of the metal fixing rod is threaded, and the bottom of the metal fixing rod is countersunk. The top of the ceramic fixing rod matches the countersunk of the metal fixing rod. The top of the ceramic fixing rod and the countersunk of the metal fixing rod are brazed by copper-tin-titanium brazing filler metal or nickel-based brazing filler metal. The bottom of the ceramic fixing rod is equipped with a base plate.

3. The ceramic-metal connection structure with detachable function according to claim 2, characterized in that: The metal retaining rod is made of stainless steel, nickel-based high-temperature alloy or iron-chromium-aluminum alloy, while the ceramic retaining rod is made of aluminum nitride, silicon nitride, silicon carbide, or aluminum nitride, silicon nitride or silicon carbide.

4. The ceramic-metal connection structure with detachable function according to claim 1, characterized in that: Both the metal top plate and the metal bottom plate have four to eight through holes on their end faces, which are evenly distributed along the circumference.

5. The ceramic-metal connection structure with detachable function according to claim 1, characterized in that: The metal top plate and metal base plate are made of stainless steel, nickel-based high-temperature alloy or iron-chromium-aluminum alloy, and the ceramic tube is made of zirconia ceramic, alumina ceramic, yttrium oxide ceramic or magnesium olivine.

6. The ceramic-metal connection structure with detachable function according to claim 1, characterized in that: The sealing ring is made of nickel, copper, silver, graphite, or vermiculite, and it is flexible.

7. The ceramic-metal connection structure with detachable function according to claim 1, characterized in that: The radial width of the sealing ring is smaller than the radial width of the annular groove, and the axial thickness of the sealing ring is greater than the sum of the axial thicknesses of the annular grooves on its upper and lower sides.

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