Mullite brick with high breaking strength

Abstract

The mullite brick with the high breaking strength comprises a stone brick body and a connecting part, the stone brick body comprises a base layer, a first strength layer and a second strength layer, the base layer is made of mullite, high alumina, industrial alumina and refractory clay, the manufacturing method is an electric melting method, and the first strength layer is made of high alumina. By means of the design, the integrity and the overall strength of the stone brick can be effectively enhanced, the first strength layer is a mullite light heat insulation brick manufactured through a foam method, the second strength layer is made of the same material as the base layer, the second strength layer is formed by splicing a plurality of square blocks, honeycomb holes are further formed in the square blocks, and the honeycomb holes are formed in the base layer. Due to the design, the compression resistance and fracture resistance of the stone brick are effectively improved, the connecting part comprises a connecting protrusion and a connecting groove, the connecting protrusion and the connecting groove are fixedly connected to the two sides of the stone brick body respectively, and the connecting protrusion and the connecting groove are matched so that a plurality of stone bricks can be conveniently spliced together.

Description

Technical Field

[0001] This utility model relates to the field of mullite brick technology, and in particular to a mullite brick with high flexural strength. Background Technology

[0002] Mullite bricks are a type of high-alumina refractory material with mullite as the main crystalline phase. The main manufacturing methods are sintering and electrofusion. Mullite bricks have excellent high-temperature stability, mechanical strength and thermal shock resistance, making them an indispensable refractory material in high-temperature industrial applications such as blast furnaces and glass melting furnaces.

[0003] Mullite bricks are used in furnaces with high temperatures of over 1,000 degrees Celsius due to their good fire resistance and mechanical strength. The harsh working environment and the shape of the furnaces they are assembled into require that mullite bricks also have excellent flexural and compressive strength. However, existing mullite brick designs rarely address these aspects, so there is a need to modify mullite bricks. Utility Model Content

[0004] The purpose of this invention is to address the shortcomings of existing technologies by proposing a mullite brick with high flexural strength.

[0005] To achieve the above objectives, this utility model adopts the following technical solution: A high flexural strength mullite brick includes a brick body and a connecting part. The brick body includes a base layer, a first strength layer, and a second strength layer. The base layer is the outermost layer and is directly in contact with the high-temperature environment. The first strength layer is an intermediate layer and is fixedly connected to the base layer. The second strength layer is fixedly connected to the other end of the first strength layer. The base layer is made of mullite as the main material and high-alumina clay, industrial alumina, and refractory clay as auxiliary materials. The manufacturing method is electrofusion. High-alumina clay and refractory clay can improve the bonding ability of the various materials in the mullite brick, thereby enhancing the overall integrity of the brick. The preparation method using industrial alumina combined with electrofusion can form larger mullite crystals, thereby enhancing the overall strength of the stone brick. The first strength layer is a lightweight heat-insulating brick made of mullite using the foaming method. Its uniform round pore structure effectively disperses the stress it receives, thereby improving the overall flexural and compressive strength of the stone brick. The second strength layer is made of the same material as the base layer and is composed of multiple square blocks. This design disperses the stress on the stone brick body, thereby improving its compressive and flexural strength. All corners of the blocks are rounded to avoid sharp corners concentrating stress and damaging the stone brick structure, thus affecting its flexural and compressive strength.

[0006] Preferably, the connecting part includes a connecting protrusion and a connecting groove, which are fixedly connected to both sides of the stone brick body. The connecting protrusion consists of two parallel protrusions with an arc-shaped front end. A groove is provided between the protrusions that is recessed into the stone brick body. There are two connecting grooves in total. The connecting grooves of two adjacent mullite bricks match the connecting protrusions, so that two adjacent mullite bricks can be perfectly spliced ​​together through the connecting protrusions and connecting grooves.

[0007] Preferably, foamed silicone is added to the seams between the blocks of the second strength layer to improve the connection stability of the second strength layer and avoid cracking caused by thermal expansion and contraction.

[0008] Preferably, the connecting part is made of the same material as the base layer, which can better fix it to both sides of the stone brick body.

[0009] Preferably, all blocks in the second strength layer are provided with honeycomb holes, the honeycomb holes have small diameters and thick walls, which further enhances the flexural and compressive strength of the stone bricks.

[0010] Preferably, a special refractory mortar is added at the connection between the second strength layer and the other two layers of the stone brick body to ensure the overall stability and airtightness of the stone brick body.

[0011] Compared with the prior art, the beneficial effects of this utility model are as follows: the base layer gives the mullite brick better integrity and overall strength; the first strength layer improves the heat insulation effect of the mullite brick; the uniform round pore structure effectively disperses the stress and improves the compressive and flexural strength of the mullite brick; the first strength layer can effectively slow down the heat transfer rate of the base layer that is in direct contact with the high temperature environment, thereby reducing the thermal stress caused by temperature changes; the reduction of thermal stress helps the overall flexural strength of the mullite brick; the second strength layer effectively disperses the stress on the brick by using multiple spliced ​​blocks and the honeycomb holes in the blocks. Attached Figure Description

[0012] Figure 1 This is a structural schematic diagram of the high flexural strength mullite brick of this utility model;

[0013] Figure 2 This is a structural diagram of the mullite brick body of the high flexural strength of this utility model;

[0014] Figure 3 This is a block structure diagram of the second strength layer of the high flexural strength mullite brick of this utility model;

[0015] Figure 4 This is a schematic diagram of the connection of the high flexural strength mullite brick of this utility model. Detailed Implementation

[0016] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Figure 1 and Figure 4 As shown, a high flexural strength mullite brick includes a brick body 1 and a connecting part 2. The connecting part 2 includes a connecting protrusion 210 and a connecting groove 220. The connecting protrusion 210 and the connecting groove 220 are respectively fixedly connected to both sides of the brick body 1. The connecting protrusion 210 consists of two parallel protrusions with an arc-shaped front end. A groove is provided between the protrusions, which is recessed into the brick body 1. The arc-shaped front end can prevent the connecting part 2 from dispersing the stress, thereby avoiding damage to the connecting part 2 caused by sharp angular stress concentration. There are two connecting grooves 220. The connecting grooves 220 of two adjacent mullite bricks match the connecting protrusions 210, which facilitates the perfect splicing of two adjacent mullite bricks together through the connecting protrusions 210 and the connecting grooves 220. The structure of multiple protrusions can provide more support points, thereby enhancing the flexural strength of the connecting part 2.

[0017] like Figure 2 As shown, the stone brick body 1 includes a base layer 110, a first strength layer 120, and a second strength layer 130. The base layer 110 is the outermost layer and is directly in contact with the high-temperature environment. The first strength layer 120 is an intermediate layer and is fixedly connected to the base layer 110. The second strength layer 130 is fixedly connected to the other end of the first strength layer 120. The base layer 110 is made of mullite as the main material, with high-alumina, industrial alumina, and refractory clay as auxiliary materials, and is manufactured by electrofusion. The first strength layer 120 is a lightweight heat-insulating brick made of mullite using a foaming method. Its uniform pore structure effectively disperses the stress, thereby improving the overall flexural and compressive strength of the stone brick. The uniform circular pores of the first strength layer 120 can effectively slow down the heat transfer of the base layer 110, thereby reducing the impact of thermal stress on the compressive and flexural strength of the mullite brick. The second strength layer 130 is made of the same material as the base layer 110. The second strength layer 130 is composed of multiple blocks 131 spliced ​​together. This design disperses the stress on the brick body, thereby improving the compressive and flexural strength. All corners of the blocks 131 are rounded to avoid sharp corners concentrating stress and damaging the brick structure, thereby affecting the compressive and flexural strength. Foamed silicone is added to the joints between the blocks 131 of the second strength layer 130 to improve the connection stability of the second strength layer 130 and avoid cracking caused by thermal expansion and contraction.

[0018] like Figure 3As shown, all blocks 131 of the second strength layer 130 are provided with honeycomb holes. The honeycomb holes have small diameters and thick walls, which further enhances the flexural and compressive strength of the stone bricks.

[0019] In use, the connecting protrusion 210 of one stone brick is inserted into the connecting groove 220 of another stone brick, and multiple stone bricks are spliced ​​together in this way. The base layer 110 of the stone brick body 1 enhances the bonding ability of the various materials of the mullite brick by using high alumina and refractory clay, thereby enhancing the integrity of the brick body. The preparation method of using industrial alumina combined with electrofusion can form larger mullite crystals, thereby enhancing the overall strength of the stone brick. Excellent integrity and overall strength can give the stone brick body 1 excellent flexural strength. The uniform round pores of the first strength layer 120 can both disperse the stress and slow down heat transfer. The second strength layer 130 further enhances the compressive and flexural strength of the stone brick body 1 through the block 131 and the honeycomb pores inside the block 131.

[0020] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A mullite brick with high flexural strength, comprising a brick body and a connecting part, characterized in that: The stone brick body includes a base layer, a first strength layer, and a second strength layer. The base layer is the outermost layer and is in direct contact with the high-temperature environment. The first strength layer is an intermediate layer and is fixedly connected to the base layer. The second strength layer is fixedly connected to the other end of the first strength layer. The first strength layer is a lightweight mullite heat-insulating brick made using the foaming method. The second strength layer is made of the same material as the base layer. The second strength layer is composed of multiple square blocks, all corners of which are rounded. All square blocks of the second strength layer have honeycomb holes with small pore diameters and thick walls.

2. The high flexural strength mullite brick as described in claim 1, characterized in that: The connecting part includes a connecting protrusion and a connecting groove. The connecting protrusion and the connecting groove are fixedly connected to both sides of the stone brick body. The connecting protrusion consists of two parallel protrusions, and the front end of the connecting protrusion is arc-shaped. A groove is provided between the protrusions that is recessed into the stone brick body. There are two connecting grooves in total. The connecting grooves of two adjacent mullion bricks match the connecting protrusions.

3. The high flexural strength mullite brick as described in claim 1, characterized in that: Foamed silicone was added to the seams between the blocks of the second strength layer.

4. The high flexural strength mullite brick as described in claim 1, characterized in that: Special refractory mortar is added at the connection between the second strength layer and the other two layers of the stone brick body.

5. The high flexural strength mullite brick as described in claim 1, characterized in that: The connecting part is made of the same material as the base layer.

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