Long service life high-strength low-carbon microporous magnesium-carbon brick

Abstract

The utility model discloses a long service life's high strength low carbon micropore magnesite carbon brick relates to low carbon micropore magnesite carbon brick technical field, including no. The no. The metal - ceramic composite coating is closely attached to the outer surface of base body, and the fiber braided net reinforced shell is closely coated outside the metal - ceramic composite coating, and the gradient gap buffer layer is closely coated outside the fiber braided net reinforced shell. The utility model discloses a base body is coated with metal - ceramic composite coating, fiber braided net reinforced shell and gradient gap buffer layer in proper order outside, and multilayer collaborative promotion magnesite carbon brick strength and life, and the coating metal - ceramic composite coating resists high temperature and is anti -erosion, and the fiber braided net reinforced shell increases mechanical property, and the gradient gap buffer layer adapts thermal expansion, and the internal stress is prevented from cracking.

Description

Technical Field

[0001] This utility model relates to the field of low-carbon microporous magnesia-carbon brick technology, specifically to a high-strength low-carbon microporous magnesia-carbon brick with a long service life. Background Technology

[0002] Low-carbon microporous magnesia-carbon bricks are refractory materials prepared through optimized formulation and processes. The carbon content is generally controlled below 8% to reduce performance degradation caused by carbon oxidation. By introducing additives such as nano-carbon black and magnesium lactate, combined with special processes, uniformly distributed micropores (pore size is usually in the micrometer range) are formed, improving the material's resistance to thermal shock and slag erosion. While reducing the carbon content, the mechanical strength of the material is maintained or improved by optimizing the matrix structure, and the thermal conductivity is reduced to reduce heat loss. Low-carbon microporous magnesia-carbon bricks are widely used in the fields of steel and non-ferrous metal smelting.

[0003] Existing magnesia-carbon bricks have low structural strength and cannot effectively resist the impact of external pressure. For example, the magnesia-carbon brick with a limiting steel ladle disclosed in CN210412510U has insufficient strength. When subjected to external pressure and impact, the magnesia-carbon brick will affect its performance and service life, and damage its internal structure.

[0004] Therefore, it is necessary to invent a high-strength, low-carbon, microporous magnesia-carbon brick with a long service life to solve the above problems. Utility Model Content

[0005] The purpose of this invention is to provide a high-strength, low-carbon, microporous magnesia-carbon brick with a long service life, which solves the problem of low structural strength and inability to effectively resist the impact of external pressure on magnesia-carbon bricks.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a high-strength, low-carbon, microporous magnesia-carbon brick with a long service life, comprising a first magnesia-carbon brick body and a second magnesia-carbon brick body. Both the first and second magnesia-carbon brick bodies include a matrix. The outer side of the matrix is ​​sequentially covered with a metal-ceramic composite coating layer, a fiber woven mesh reinforcing shell, and a gradient void buffer layer. The metal-ceramic composite coating layer is tightly attached to the outer surface of the matrix. The fiber woven mesh reinforcing shell is tightly wrapped around the outer side of the metal-ceramic composite coating layer. The gradient void buffer layer is tightly wrapped around the outer side of the fiber woven mesh reinforcing shell.

[0007] Preferably, a second magnesia-carbon brick body is spliced ​​to one side of the first magnesia-carbon brick body, and the two are connected by a tenon and mortise structure to achieve multi-directional locking. The multi-directional locking connection makes the bricks form a tight whole, which can more evenly distribute and transmit external forces, improve the load-bearing capacity of the entire structure, and adapt to more severe working environments.

[0008] Preferably, the metal-ceramic composite coating layer is composed of aluminum-alumina composite material, which can effectively block the erosion of the internal matrix by high temperature, improve the high temperature resistance of magnesia-carbon bricks, and ensure their normal operation under high temperature conditions.

[0009] Preferably, the fiber woven mesh reinforcing shell is formed by a three-dimensional weaving process using silicon carbide fibers to create a three-dimensional woven structure. This structure is then fully impregnated and cured with phenolic resin, which can effectively improve the tensile, compressive, and flexural strength of the magnesia-carbon bricks, while also enhancing their toughness and reducing cracks and fractures caused by stress during use.

[0010] Preferably, the porosity of the gradient void buffer layer increases from 10% to 30% from the inside to the outside. The gradient porosity design of the gradient void buffer layer can adapt to this thermal expansion difference to a certain extent, and alleviate the internal stress caused by thermal expansion mismatch through the deformation of the pores, thus preventing the brick from cracking due to thermal stress.

[0011] Preferably, the mortise and tenon structure includes a first dovetail tenon and a first mortise on the top surface of the first and second magnesia-carbon brick bodies, a second dovetail tenon and a second mortise on the side wall, and a third dovetail tenon and a third mortise on the front and rear sides. By setting dovetail tenons and mortises in different positions, the first and second magnesia-carbon brick bodies can be locked and connected from multiple directions to form a more stable overall structure.

[0012] Preferably, the first dovetail tenon, the second dovetail tenon, and the third dovetail tenon are all designed with a trapezoidal structure. The first dovetail tenon matches the first mortise, the second dovetail tenon matches the second mortise, and the third dovetail tenon matches the third mortise. This matching design also helps to reduce errors and deviations during the installation process.

[0013] The technical effects and advantages provided by this utility model in the above technical solution are as follows:

[0014] 1. This utility model improves the strength and lifespan of magnesia-carbon bricks by sequentially coating the base with a metal-ceramic composite coating layer, a fiber woven mesh reinforcing shell, and a gradient void buffer layer. The metal-ceramic composite coating layer resists high temperature and corrosion, the fiber woven mesh reinforcing shell enhances mechanical properties, and the gradient void buffer layer adapts to thermal expansion, relieves internal stress, and prevents cracking.

[0015] 2. This utility model achieves the effect of easy splicing and stable connection of each surface by setting a multi-directional locking tenon and mortise structure between the No. 1 magnesia-carbon brick body and the No. 2 magnesia-carbon brick body. The tenon and mortise structure includes dovetail tenons and corresponding mortises set on the bottom, top, side walls and front and back sides. This multi-position and multi-directional connection method can lock the brick body from multiple angles, so that the brick body forms a tight integral structure, which is convenient for construction personnel to splice quickly and accurately. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0017] Figure 2 This is a schematic diagram of the exploded front view of the No. 1 magnesia-carbon brick body and the No. 2 magnesia-carbon brick body of this utility model.

[0018] Figure 3 This is a three-dimensional structural diagram of the No. 3 dovetail tenon of this utility model;

[0019] Figure 4 This is a three-dimensional cross-sectional structural diagram of the No. 1 magnesia-carbon brick body of this utility model;

[0020] Figure 5 This is a cross-sectional three-dimensional structural diagram of the metal-ceramic composite coating layer, the fiber woven mesh reinforcing shell, and the gradient void buffer layer of this utility model.

[0021] Explanation of reference numerals in the attached figures:

[0022] 1. Magnesia-carbon brick body No. 1; 101. Matrix; 102. Metal-ceramic composite coating layer; 103. Fiber woven mesh reinforcing shell; 104. Gradient void buffer layer; 2. Magnesia-carbon brick body No. 2; 3. Dovetail tenon No. 1; 4. Mortise No. 1; 5. Dovetail tenon No. 2; 6. Mortise No. 2; 7. Dovetail tenon No. 3; 8. Mortise No. 3. Detailed Implementation

[0023] To enable those skilled in the art to better understand the technical solution of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings.

[0024] This utility model provides, for example Figure 1-5The invention relates to a high-strength, low-carbon, microporous magnesia-carbon brick with a long service life, comprising a first magnesia-carbon brick body 1 and a second magnesia-carbon brick body 2. Both the first magnesia-carbon brick body 1 and the second magnesia-carbon brick body 2 include a matrix 101. The outer side of the matrix 101 is sequentially covered with a metal-ceramic composite coating layer 102, a fiber woven mesh reinforcing shell 103, and a gradient void buffer layer 104. The metal-ceramic composite coating layer 102 is tightly attached to the outer surface of the matrix 101, the fiber woven mesh reinforcing shell 103 is tightly covered to the outside of the metal-ceramic composite coating layer 102, and the gradient void buffer layer 104 is tightly covered to the outside of the fiber woven mesh reinforcing shell 103.

[0025] One side of the No. 1 magnesia-carbon brick body 1 is spliced ​​with the No. 2 magnesia-carbon brick body 2. The two are connected by a tenon and mortise structure to achieve multi-directional locking. The metal-ceramic composite coating layer 102 is made of aluminum-alumina composite material. The fiber woven mesh reinforcing shell 103 is formed by three-dimensional weaving process of silicon carbide fiber to form a three-dimensional woven structure. The structure is fully impregnated and cured with phenolic resin. The porosity of the gradient void buffer layer 104 increases from 10% to 30% from the inside to the outside.

[0026] In this embodiment, the aluminum-alumina composite material exhibits excellent high-temperature stability and good oxidation resistance. The metal-ceramic composite coating layer 102 not only effectively blocks the corrosion of the internal matrix 101 by high temperature, preventing the matrix 101 from softening, deforming, or even being damaged due to high temperature, thus ensuring the normal operation of the magnesia-carbon brick under high-temperature conditions, but also reduces the reaction of the magnesia-carbon brick with oxidizing gases such as oxygen at high temperatures, reducing oxidation loss. Furthermore, the fiber woven mesh reinforcement shell 103 can significantly improve the tensile, compressive, and flexural strength of the magnesia-carbon brick, reducing cracks and fractures caused by stress. In addition, the gradient void buffer layer 104 can adapt to thermal expansion differences to a certain extent. When the brick expands due to heat, the pores will deform, thereby alleviating the internal stress caused by the mismatch of thermal expansion, preventing the brick from cracking due to thermal stress, and further improving the heat resistance and service life of the magnesia-carbon brick.

[0027] The mortise and tenon structure includes a first dovetail tenon 3 at the bottom of the first magnesia-carbon brick body 1 and the second magnesia-carbon brick body 2, a first mortise 4 on the top surface, a second dovetail tenon 5 and a second mortise 6 on the side wall, and a third dovetail tenon 7 and a third mortise 8 on the front and back sides. The first dovetail tenon 3, the second dovetail tenon 5 and the third dovetail tenon 7 are all designed in a trapezoidal structure. The first dovetail tenon 3 matches the first mortise 4, the second dovetail tenon 5 matches the second mortise 6, and the third dovetail tenon 7 matches the third mortise 8.

[0028] In this embodiment, the mortise and tenon structure locks the No. 1 magnesia-carbon brick body 1 and the No. 2 magnesia-carbon brick body 2 from multiple directions, including the bottom, top, side walls, and front and rear sides, forming a tight whole. This multi-directional locking method effectively restricts the relative displacement of the bricks in various directions, preventing the bricks from becoming loose, misaligned, or even falling off, thus ensuring the integrity and stability of the furnace wall structure.

[0029] Working principle of this utility model:

[0030] Refer to the instruction manual appendix Figure 1-5 When using this utility model, firstly, when splicing the No. 1 magnesia-carbon brick body 1 and the No. 2 magnesia-carbon brick body 2, for the bottom connection, the construction worker accurately inserts the No. 1 dovetail tenon 3 at the bottom of the No. 1 magnesia-carbon brick body 1 into the No. 1 mortise 4 at the corresponding position on the top surface of the No. 2 magnesia-carbon brick body 2; at the side wall connection, the No. 2 dovetail tenon 5 on the side wall of the No. 1 magnesia-carbon brick body 1 is pushed into the corresponding No. 2 mortise 6 on the side wall of the No. 2 magnesia-carbon brick body 2; when connecting the front and rear sides, the No. 3 dovetail tenon 7 on the front and rear sides of the No. 1 magnesia-carbon brick body 1 is embedded into the No. 3 mortise 8 on the front and rear sides of the No. 2 magnesia-carbon brick body 2. Since each dovetail tenon matches the corresponding mortise, and the dovetail tenon is trapezoidal in design, the trapezoidal structure gradually tightens during insertion, achieving a tight connection. In this way, multiple magnesia-carbon brick bodies are spliced ​​in sequence, and finally the construction of the entire furnace wall is completed.

[0031] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0032] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A high-strength, low-carbon, microporous magnesia-carbon brick with a long service life, comprising a first magnesia-carbon brick body (1) and a second magnesia-carbon brick body (2), characterized in that: Both the No. 1 magnesia-carbon brick body (1) and the No. 2 magnesia-carbon brick body (2) include a matrix (101). The outer side of the matrix (101) is sequentially covered with a metal-ceramic composite coating layer (102), a fiber woven mesh reinforcing shell (103), and a gradient void buffer layer (104). The metal-ceramic composite coating layer (102) is tightly attached to the outer surface of the matrix (101). The fiber woven mesh reinforcing shell (103) is tightly covered on the outside of the metal-ceramic composite coating layer (102). The gradient void buffer layer (104) is tightly covered on the outside of the fiber woven mesh reinforcing shell (103).

2. The high-strength, low-carbon, microporous magnesia-carbon brick with a long service life according to claim 1, characterized in that: The No. 1 magnesia-carbon brick body (1) is spliced ​​with the No. 2 magnesia-carbon brick body (2) on one side, and the two are connected by a tenon and mortise structure to achieve multi-directional locking.

3. The high-strength, low-carbon, microporous magnesia-carbon brick with a long service life according to claim 1, characterized in that: The metal-ceramic composite coating (102) is composed of aluminum-alumina composite material.

4. The high-strength, low-carbon, microporous magnesia-carbon brick with a long service life according to claim 1, characterized in that: The fiber woven mesh reinforced shell (103) is formed by three-dimensional weaving of silicon carbide fibers to form a three-dimensional woven structure, and the structure is fully impregnated and cured with phenolic resin.

5. The high-strength, low-carbon, microporous magnesia-carbon brick with a long service life according to claim 1, characterized in that: The porosity of the gradient void buffer layer (104) increases from 10% to 30% from the inside to the outside.

6. The high-strength, low-carbon, microporous magnesia-carbon brick with a long service life according to claim 2, characterized in that: The mortise and tenon structure includes a first dovetail tenon (3) and a first mortise (4) on the top surface of the first magnesia-carbon brick body (1) and the second magnesia-carbon brick body (2), a second dovetail tenon (5) and a second mortise (6) on the side wall, and a third dovetail tenon (7) and a third mortise (8) on the front and back sides.

7. A high-strength, low-carbon, microporous magnesia-carbon brick with a long service life according to claim 6, characterized in that: The first dovetail tenon (3), the second dovetail tenon (5), and the third dovetail tenon (7) are all designed in a trapezoidal structure. The first dovetail tenon (3) is matched with the first mortise (4), the second dovetail tenon (5) is matched with the second mortise (6), and the third dovetail tenon (7) is matched with the third mortise (8).

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