Spliced ceramic air brick

Abstract

The application discloses a spliced ceramic air brick, which comprises a brick body, the brick body is stacked by at least two ceramic sheets, a plurality of air through grooves for passing inert gas clean molten steel are arranged on at least one of two contact surfaces of each two adjacent ceramic sheets, and a plurality of blowing channels for passing inert gas are formed between the two adjacent ceramic sheets through the plurality of air through grooves. A plurality of air through grooves are milled on one surface of a ceramic sheet, and the air through grooves are matched with the surface of another ceramic sheet, so that the air through grooves and the surface form blowing channels for blowing argon or other inert gas, the strength of the surface of the channels is high, the anti-peeling property is strong, the molten steel washing resistance is strong, and the service life is long, so that the argon blowing process is stable, reliable and safe.

Description

Technical Field

[0001] This utility model relates to the field of breathable brick technology, and in particular to a spliced ​​ceramic breathable brick. Background Technology

[0002] Ladle refining technology is an important refining process in steelmaking. In ladle refining technology, permeable bricks are mainly used to rapidly disperse and promote the melting of alloys, deoxidizers, desulfurizers, etc. added to molten steel, promote the removal of gases and non-metallic inclusions in steel, and have the function of uniformizing the temperature and composition of molten steel, cleaning the molten steel, improving the quality of steel, and thus achieving the refining purpose.

[0003] As the most critical functional component in the bottom-blown argon (inert gas) process, the performance of the permeable brick ensures the smooth implementation of the bottom-blown argon process and guarantees the reliability and safety of the ladle refining process.

[0004] Existing permeable bricks mainly consist of a permeable brick core, a steel shell, and an air blowing pipe. During the casting process, polyester strips are inserted into the molding mold to form the permeable brick core. After the permeable brick core is cast and molded, it is baked at high temperature. The polyester strips burn off, forming a channel for blowing argon gas upwards.

[0005] Because the channels of existing permeable bricks are formed by casting and sintering, their surface strength is insufficient, their resistance to argon gas erosion is reduced, their anti-stripping properties are poor, which affects the service life of the permeable elements. The permeable bricks are also prone to delamination (fracture), which affects their permeability.

[0006] Therefore, it is crucial to design a ceramic permeable brick that is high in strength, long in service life, strong in resistance to peeling, and stable and reliable. Utility Model Content

[0007] The technical problem to be solved by this utility model is to provide a spliced ​​ceramic breathable brick.

[0008] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is: a spliced ​​ceramic permeable brick, including a brick body, which is composed of at least two stacked ceramic sheets. Multiple penetrating ventilation grooves for passing inert gas through molten steel are formed on at least one of the two contact surfaces of each pair of adjacent ceramic sheets. Multiple air blowing channels for inert gas are formed between adjacent ceramic sheets through these ventilation grooves. By milling multiple ventilation grooves on one surface of a ceramic sheet and fitting it to the plane of another ceramic sheet, air blowing channels for argon or other inert gases are formed between the ventilation grooves and the plane. The channel surface has high strength, strong resistance to peeling, strong resistance to molten steel erosion, and a long service life, making the argon blowing process stable, reliable, and safe.

[0009] In some embodiments, at least one end of the brick body has a plug-in structure, and the plug-in structures of two brick bodies can be matched and plugged in, allowing the air-blowing channels within the two brick bodies to be connected through the plug-in structure. This splicing method combines multiple shorter brick bodies into a longer breathable brick, replacing traditional one-piece breathable bricks. It is less prone to breakage, and if damaged, only a damaged section of the brick body can be replaced, eliminating the need for complete replacement and reducing maintenance costs. Furthermore, it can be spliced ​​into breathable bricks of different lengths to meet various needs, making it highly adaptable.

[0010] In some embodiments, the interlocking structure consists of mutually matching protrusions or recesses. During splicing, the protrusion of one of the two brick bodies and the recess of the other are matched and interlocked. The end faces of adjacent brick bodies are sealed together. The depth of the recess is greater than the height of the protrusion, forming a gap cavity between the two brick bodies after splicing. All the air blowing channels of the two brick bodies are connected to the gap cavity. Even if the air grooves in adjacent brick bodies are not aligned, they can be connected through the intermediate gap cavity without affecting the air blowing efficiency. The gap cavity design reduces the precision requirements for opening the air grooves, thus lowering processing costs.

[0011] In some embodiments, one of the two brick bodies has an outer raised edge on its end face, within which the recess is formed. The other brick body has an outer groove on its end face that matches the raised edge, with a protrusion in the center of the groove. During splicing, the raised edge and the periphery of the protrusion are sealed and engaged, with the protrusion inserted into the recess. This splicing method ensures a tight connection at the edges, facilitating subsequent sealing after grinding. A gap cavity is formed in the center to prevent leakage of argon or other inert gases, resulting in good gas blowing performance.

[0012] In some embodiments, multiple fixing grooves for securing fixing rods are formed on both sides of the brick body. The length direction of the fixing grooves is perpendicular to the stacking direction of the ceramic pieces, and the length direction of the fixing rods is consistent with the length direction of the fixing grooves. Each fixing groove is formed by aligning and stacking notches at the edges of the ceramic pieces. The fixing grooves are designed to secure the fixing rods, ensuring a tighter stacking of multiple ceramic pieces and preventing air leakage.

[0013] In some embodiments, the width of the gap cavity is 0.4-0.6 mm, and the width of the vent groove is 1.5-2.5 mm, and the depth is 0.15-0.25 mm.

[0014] In some embodiments, the brick body is made of ≥90% alumina.

[0015] The scope of this utility model is not limited to technical solutions formed by specific combinations of the above-mentioned technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-mentioned technical features or their equivalent features. For example, technical solutions formed by substituting the above-mentioned features with (but not limited to) technical features with similar functions disclosed in this application.

[0016] Due to the application of the above technical solution, this utility model has the following advantages compared with the prior art: 1. This utility model mills multiple ventilation grooves on one surface of a ceramic sheet and attaches it to the plane of another ceramic sheet, so that a channel for blowing argon or other inert gas is formed between the ventilation grooves and the plane. The channel surface has high strength, strong anti-peeling properties, strong anti-steel erosion performance, and long service life, making the argon blowing process stable, reliable and safe. 2. By using a splicing method, multiple shorter brick bodies are spliced ​​together to form a longer breathable brick module, replacing the traditional one-piece breathable brick. This method is less prone to breakage, and if damaged, only a damaged section of the brick body can be replaced instead of replacing the entire brick, thus reducing maintenance costs. Furthermore, it can be spliced ​​together to form breathable bricks of different lengths according to different needs, making it highly adaptable. 3. The gap cavity design allows the ventilation grooves in two adjacent brick bodies to be connected through the middle gap cavity even if they are not aligned, without affecting the blowing efficiency. The gap cavity also reduces the precision requirements for opening the ventilation grooves, thus reducing processing costs. 4. During splicing, the outer protruding edge of one brick body engages with the protruding periphery of another brick body. This splicing method ensures a tight connection at the edges, facilitating sealing after subsequent grinding. A gap cavity is formed in the middle to prevent leakage of argon or other inert gases, resulting in good air blowing effect. 5. The fixing groove is designed to hold the fixing rod in place, allowing multiple ceramic pieces to be stacked more tightly and preventing air leakage. Attached Figure Description

[0017] Figure 1 A 3D schematic diagram of the assembled ceramic breathable bricks; Figure 2 A three-dimensional schematic diagram of ceramic sheets after the ceramic breathable bricks are spliced ​​together; Figure 3 for Figure 2 Enlarged view of point B; Figure 4 This is a front view of the assembled ceramic breathable bricks. Figure 5 for Figure 4 AA cross-sectional diagram; Figure 6 for Figure 5 Enlarged view of point C; Among them: 1. Ceramic sheet; 11. Ventilation groove; 12. Fixing groove; 2. Joint. Detailed Implementation

[0018] The following is a detailed description of this solution in conjunction with the accompanying drawings.

[0019] like Figure 1-5 The ceramic breathable brick shown includes a brick body, which is made of ≥90% alumina. In this embodiment, the ceramic sheet body includes 90-98% alumina and 2-10% chromium oxide. The chromium oxide content in the sheet body is very small, or it can be made entirely of alumina, that is, the alumina content is 100%.

[0020] In this embodiment, the brick body is a cuboid made of 10 ceramic sheets 1 stacked together. The thickness of the first and last ceramic sheets 1 of each brick body is greater than the thickness of the middle ceramic sheets 1, which facilitates the subsequent formation of the outer edge protrusion.

[0021] like Figure 2 As shown, multiple penetrating ventilation grooves 11 are formed on one of the two contact surfaces of every two adjacent ceramic plates 1. These ventilation grooves 11 are used to pass inert gas to clean molten steel. The side of one ceramic plate 1 with the ventilation grooves 11 is attached to the flat surface of another plate, so that the ventilation grooves 11 can form multiple air blowing channels for inert gas to pass through. The width of the ventilation grooves 11 is 1.5-2.5mm and the depth is 0.15-0.25mm. In this embodiment, the width is 2mm and the depth is 0.2mm.

[0022] In certain situations where a longer air blowing channel is required, multiple bricks can be joined together and the air blowing channel connected for use.

[0023] Therefore, this utility model provides an insertion structure at the end of the brick body, such as... Figure 5 , 6 As shown, the plug-in structure of the two brick bodies can be matched and plugged in, and the air blowing channels inside the two brick bodies can be connected through the plug-in structure.

[0024] The plug-in structure consists of mutually matching protrusions or recesses, as detailed below: like Figure 5 As shown, one of the two brick bodies has an outer convex edge formed on its end face, with a recess formed inside the outer convex edge. The other brick body has an outer groove formed on its end face that matches the outer convex edge, with a protrusion formed in the middle of the outer groove. When splicing, the outer convex edge and the periphery of the protrusion engage. The protrusion of one of the two brick bodies and the recess of the other match and insert, achieving a sealed connection at the edges of the two adjacent brick bodies.

[0025] To ensure that the air blowing channels of the two brick bodies can be connected and to guarantee air blowing efficiency, the depth of the recess is designed to be greater than the height of the protrusion, with a height difference of 0.4-0.6mm. This allows the two brick bodies to be joined together to form a gap cavity 2, the width of which is 0.4-0.6mm. In this embodiment, the width of the gap cavity 2 is 0.5mm. All air vents 11 are penetrating, meaning that all air blowing channels of the two brick bodies can be connected to the gap cavity 2.

[0026] The gap cavity design allows the ventilation grooves in two adjacent brick bodies to be connected through the middle gap cavity even if they are not aligned, without affecting the blowing efficiency. The gap cavity also reduces the precision requirements for opening the ventilation grooves, thus lowering the processing cost.

[0027] like Figure 1 , 2 As shown in Figure 4, multiple fixing grooves 12 are provided on both sides of the brick body to hold the fixing rods. The length direction of the fixing grooves 12 is perpendicular to the stacking direction of the ceramic pieces 1, and the length direction of the fixing rods is consistent with the length direction of the fixing grooves 12. Each fixing groove 12 is formed by aligning and stacking the notches at the edges of the ceramic pieces 1. The fixing grooves 12 are designed to hold the fixing rods, making the multiple ceramic pieces stack more tightly and preventing air leakage.

[0028] The specific steps for preparing interlocking ceramic permeable bricks are as follows: Step S1: Prepare multiple ceramic sheet blanks, each with a length of 180.7 mm, a width of 78.3 mm, and a thickness of 8.4 mm. Step S2: Place multiple ceramic sheet blanks into a sintering furnace for sintering at a temperature of 900°C for 2 hours to obtain a semi-finished ceramic sheet. Step S3: Process the ceramic sheet semi-finished product by milling multiple through ventilation grooves on the front or back using a milling machine. In this embodiment, all ventilation grooves 11 extend in the same direction and are consistent with the length direction of the ceramic sheet semi-finished product. Multiple notches for splicing into a fixing groove are opened on both sides. Step S4: In this embodiment, multiple ceramic sheet semi-finished products are stacked and pressed together, and then placed into a sintering furnace for sintering at a temperature of 1650°C. After sintering into one piece, the pieces are polished to obtain the brick body. In this embodiment, a maximum of five pieces are fired together. If more than five pieces are fired together, cracks will occur. In addition to the above method, each ceramic sheet can also be placed into a sintering furnace for sintering at a temperature of 1650°C. Multiple sintered ceramic sheets are stacked and glued together. The notches on each ceramic sheet are aligned vertically to form a fixing groove. A fixing rod made of ceramic fiber is inserted into the fixing groove to fix the brick body. Step S5: Process the end face of the brick body for interlocking two adjacent brick bodies. Use a splicing method to splice two shorter brick bodies into a longer brick module, replacing the traditional one-piece breathable brick. It is less prone to breakage. If damaged, only a damaged section of the brick body can be replaced, without replacing the whole brick body, reducing maintenance costs. It can also be spliced ​​into breathable bricks of different lengths according to different needs, making it highly adaptable. Process a recess in the middle of one end face of one brick body, forming an outer raised edge around the recess. Process an outer groove in the middle of the outer groove on one end face of the other brick body, forming a protrusion in the middle of the outer groove. The depth of the recess is greater than the height of the protrusion. Interlock the outer raised edges of the two adjacent brick bodies with the corresponding protrusions around the periphery to connect the two brick bodies. Step S6: Use a grinder to grind the surfaces of the two brick bodies that are inserted, so that the periphery of the end faces of the two adjacent brick bodies are sealed and connected to prevent argon gas leakage and improve the argon blowing effect.

[0029] like Figure 2 , 5 6. In this embodiment, the end face of the brick body is processed for the horizontal splicing of two adjacent brick bodies. A concave part is processed in the middle of the end face of one brick body, and an outer convex edge is formed around the concave part. An outer groove is processed in the end face of the other brick body, and a convex part is formed in the middle of the outer groove. The depth of the concave part is greater than the height of the convex part. The outer convex edges of the two adjacent brick bodies are engaged with the corresponding convex parts around the convex parts to form a spliced ​​ceramic breathable brick.

[0030] In this embodiment, as Figure 1 As shown, the module is made by inserting two bricks together. The final module has a length of 300mm (a), a width of 65mm (c), and a height of 70mm (b).

[0031] The above embodiments are only for illustrating the technical concept and features of this utility model, and are intended to enable those skilled in the art to understand the content of this utility model and implement it accordingly. They should not be construed as limiting the scope of protection of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be included within the scope of protection of this utility model.

Claims

1. A type of interlocking ceramic breathable brick, characterized in that: The brick body is composed of at least two ceramic pieces (1) stacked together. At least one of the two contact surfaces of each pair of adjacent ceramic pieces (1) is provided with multiple penetrating ventilation grooves (11) for passing inert gas to clean molten steel. Multiple air blowing channels for inert gas to pass through are formed between the two adjacent ceramic pieces (1) through the multiple ventilation grooves (11).

2. The interlocking ceramic breathable brick according to claim 1, characterized in that: The brick body has a plug-in structure at at least one end, and the plug-in structures of two brick bodies can be matched and plugged in, and the air blowing channels in the two brick bodies can be connected through the plug-in structure.

3. The interlocking ceramic permeable brick according to claim 2, characterized in that: The insertion structure consists of protrusions or recesses that can match each other. When splicing, the protrusion of one of the two brick bodies and the recess of the other are matched and inserted. The periphery of the end faces of the two adjacent brick bodies are sealed and connected. The depth of the recess is greater than the height of the protrusion, so that a gap cavity (2) is formed between the two brick bodies after splicing. All the air blowing channels of the two brick bodies are connected to the gap cavity (2).

4. The interlocking ceramic permeable brick according to claim 3, characterized in that: One of the two brick bodies has an outer convex edge formed on its end face, and a recess is formed inside the outer convex edge. The other brick body has an outer groove formed on its end face that matches the outer convex edge, and a protrusion is formed in the middle of the outer groove. When splicing, the outer convex edge and the periphery of the protrusion are sealed and engaged, and the protrusion is inserted into the recess.

5. The interlocking ceramic permeable brick according to claim 1, characterized in that: The brick body has multiple fixing grooves (12) on both sides for securing the fixing rod. The length direction of the fixing groove (12) is perpendicular to the stacking direction of the ceramic sheet (1). The length direction of the fixing rod is consistent with the length direction of the fixing groove (12). Each fixing groove (12) is formed by stacking the notches at the edges of the ceramic sheet (1).

6. The interlocking ceramic permeable brick according to claim 3, characterized in that: The gap cavity (2) has a width of 0.4-0.6 mm, and the ventilation groove (11) has a width of 1.5-2.5 mm and a depth of 0.15-0.25 mm.

7. The interlocking ceramic permeable brick according to claim 1, characterized in that: The brick body is made of ≥90% alumina.

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