Slag resistant corundum-silicon carbide honeycomb brick

Abstract

The utility model provides a kind of corundum-silicon carbide honeycomb brick of slag erosion resistance, including brick body, the brick body includes corundum-silicon carbide matrix, transition layer and working layer and is sequentially layered and spread compaction molding, the working layer is equipped with several holes, the hole is hexagonal trapezoidal and is arranged in honeycomb shape, the hole orifice big one end is located at working layer top end, and the hole orifice small one end is located at working layer bottom end.The utility model melts slag and seeps into from the hole orifice big one end, with its downward penetration, the cross-sectional area of passageway gradually reduces, effectively slows down the penetration rate of molten slag, quickly forms a natural blocking layer, prevents the further penetration of subsequent molten slag.

Description

Technical Field

[0001] This utility model relates to the field of refractory and thermal insulation materials, and in particular to a corundum-silicon carbide honeycomb brick resistant to slag erosion. Background Technology

[0002] Under capillary action, molten slag penetrates deep into the refractory material along its pores and microcracks. This penetrating slag reacts with the refractory material, altering its chemical composition and forming a low-melting-point modified layer. Because the modified layer differs in physical properties from the original layer, it generates significant stress during temperature changes, causing the material to peel off from the working surface in flakes or blocks, resulting in a short service life. Summary of the Invention

[0003] To address the above problems, this utility model provides a slag-resistant corundum-silicon carbide honeycomb brick.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: a corundum-silicon carbide honeycomb brick resistant to slag erosion, comprising a brick body, wherein the brick body comprises a corundum-silicon carbide matrix, a transition layer and a working layer, which are laid and pressed layer by layer in sequence. The working layer is provided with a plurality of channels, wherein the channels are hexagonal frustums arranged in a honeycomb pattern, and the end with the larger opening of the channel is located at the top of the working layer, and the end with the smaller opening of the channel is located at the bottom of the working layer.

[0005] Preferably, the channel penetrates only the working layer, the diameter of the larger end of the channel opening is 2.5-3.5mm, the diameter of the smaller end of the channel opening is 1.5-2.5mm, and the wall thickness of the channel is 0.8-1.2mm.

[0006] Preferably, the working layer comprises more than 85% silicon carbide, 1%-3% sintering aid, 1%-2% antioxidant and 1%-3% binder, and the corundum-silicon carbide matrix comprises 60%-70% tabular corundum, 25%-35% silicon carbide, 1%-2% sintering aid and 1%-2% antioxidant.

[0007] Preferably, the working layer has a thickness of 10-20 mm, and the transition layer has a thickness of 4-6 mm.

[0008] Preferably, the transition layer includes an upper transition layer, an intermediate transition layer and a lower transition layer arranged in sequence, the top surface of the upper transition layer is connected to the bottom surface of the working layer, and the bottom surface of the lower transition layer is connected to the top surface of the corundum-silicon carbide substrate.

[0009] Preferably, the upper transition layer comprises 20%-30% tabular corundum and 70%-80% silicon carbide, the intermediate transition layer comprises 40%-60% tabular corundum and 40%-60% silicon carbide, the lower transition layer comprises 70%-80% tabular corundum and 20%-30% silicon carbide, and the transition layer further comprises 2%-4% sintering aid and 1-2% binder.

[0010] Compared with the prior art, the beneficial effects of this utility model are as follows: the slag seeps in from the larger end of the orifice, and as it seeps downward, the cross-sectional area of ​​the channel gradually decreases, effectively slowing down the slag's penetration rate and quickly forming a natural blocking layer to prevent further penetration of the slag; the channel only penetrates the working layer, ensuring the strength and stability of the corundum-silicon carbide matrix and preventing the channel from penetrating the transition layer. The slag directly attacks the corundum-silicon carbide matrix through the channel, effectively preventing the slag that has penetrated the working layer from continuing to erode inward, thus protecting the relatively slag-corrosion-sensitive corundum-silicon carbide matrix. Attached Figure Description

[0011] Figure 1 This is a top view of the slag-resistant corundum-silicon carbide honeycomb brick of this utility model.

[0012] Figure 2 This is a cross-sectional view of the slag-resistant corundum-silicon carbide honeycomb brick of this utility model.

[0013] Figure descriptions: 1. Brick body, 2. Working layer, 3. Transition layer, 31. Upper transition layer, 32. Middle transition layer, 33. Lower transition layer, 4. Corundum-silicon carbide matrix, 5. Channel. Detailed Implementation

[0014] To provide a better understanding of the purpose, structure, features, and functions of this utility model, detailed descriptions are provided below with reference to specific embodiments.

[0015] Please refer to the reference. Figure 1 and Figure 2 An embodiment of the present invention provides a slag-resistant corundum-silicon carbide honeycomb brick, comprising a brick body 1, wherein the brick body 1 comprises a corundum-silicon carbide matrix 4, a transition layer 3 and a working layer 2, which are laid and pressed in sequence. The working layer 2 is provided with a plurality of channels 5, wherein the channels 5 are hexagonal frustums arranged in a honeycomb pattern, wherein the larger end of the channel 5 is located at the top of the working layer 2 and the smaller end of the channel 5 is located at the bottom of the working layer 2.

[0016] The working layer 2 is used to directly resist slag erosion, the transition layer 3 is used to prevent interlayer peeling, the corundum-silicon carbide matrix 4 is used to provide the overall structural strength, volume stability and certain thermal insulation performance of the brick, the channel 5 is preferably a regular hexagonal frustum shape, which facilitates uniform stress distribution. The slag seeps in from the larger end of the orifice. As it seeps downward, the cross-sectional area of ​​the channel gradually decreases, which effectively slows down the slag seepage rate and quickly forms a natural blocking layer to prevent further penetration of subsequent slag. The connection between the working layer 2 and the transition layer 3 is a smooth slope, which effectively relieves and releases the thermal stress at the interface and greatly reduces the risk of the working layer 2 peeling off.

[0017] In one embodiment, such as Figure 2 As shown, the channel 5 only penetrates the working layer 2, ensuring the strength and stability of the corundum-silicon carbide matrix 4 and preventing the channel 5 from penetrating the transition layer 3. The slag directly attacks the corundum-silicon carbide matrix 4 through the channel 5, effectively preventing the slag that has penetrated the working layer 2 from continuing to erode inward, thus protecting the relatively slag-sensitive corundum-silicon carbide matrix 4. The diameter of the larger end of the channel 5 is 2.5-3.5 mm, and the diameter of the smaller end of the channel 5 is 1.5-2.5 mm. This avoids the possibility that the diameter is too small and easily blocked by the slag, thus losing the physical barrier effect, and avoids the possibility that the diameter is too large and will increase the slag penetration force, thus reducing the number of channels 5 per unit area. The wall thickness of the channel 5 is 0.8-1.2 mm, ensuring that the single wall strength is sufficient to resist slag erosion and thermal stress, while also ensuring that the overall structure has an open area ratio of 40%-50%.

[0018] In one embodiment, the working layer 2 comprises more than 85% silicon carbide, 1%-3% sintering aid, 1%-2% antioxidant, and 1%-3% binder, and the corundum-silicon carbide matrix 4 comprises 60%-70% tabular corundum, 25%-35% silicon carbide, 1%-2% sintering aid, and 1%-2% antioxidant. The sintering aid is preferably SiO2 micro powder, the antioxidant is preferably metallic Si powder, and the binder is preferably resin.

[0019] In one embodiment, such as Figure 2 As shown, the working layer 2 has a thickness of 10-20mm, and the transition layer 3 has a thickness of 4-6mm, ensuring the stability of the erosion resistance of the working layer 2 and the anti-delamination effect of the transition layer 3.

[0020] In one embodiment, such as Figure 2 As shown, the transition layer 3 includes an upper transition layer 31, an intermediate transition layer 32 and a lower transition layer 33 arranged in sequence. The top surface of the upper transition layer 31 is connected to the bottom surface of the working layer 2, and the bottom surface of the lower transition layer 33 is connected to the top surface of the corundum-silicon carbide substrate 4.

[0021] In one embodiment, such as Figure 1 and Figure 2As shown, the upper transition layer 31 comprises 20%-30% tabular corundum and 70%-80% silicon carbide, with a composition similar to the coating, ensuring that the two can achieve strong sintering through abundant SiC-SiC bonding and matching thermal expansion coefficients. The middle transition layer 32 comprises 40%-60% tabular corundum and 40%-60% silicon carbide, with a thermal expansion coefficient and elastic modulus between the two, serving as the core area for buffering and dispersing thermal stress. The lower transition layer 33 comprises 70%-80% tabular corundum and 20%-30% silicon carbide, with a composition similar to the matrix, ensuring a strong Al2O3-Al2O3 and mullite bond with the matrix. The transition layer 3 also includes 2%-4% sintering aids and 1-2% binders.

[0022] Usage: Combine Figures 1-2 As shown, the working layer 2 is used to directly resist slag erosion, the transition layer 3 is used to prevent interlayer peeling, the corundum-silicon carbide matrix 4 is used to provide the overall structural strength, volume stability and certain thermal insulation performance of the brick, the channel 5 is preferably a regular hexagonal frustum shape, which facilitates uniform stress distribution. The molten slag seeps in from the larger end of the orifice. As it seeps downward, the cross-sectional area of ​​the channel gradually decreases, effectively slowing down the molten slag seepage rate and quickly forming a natural blocking layer to prevent further seepage of subsequent molten slag.

[0023] This utility model has been described by the above-described embodiments; however, these embodiments are merely examples for implementing this utility model. It must be noted that the disclosed embodiments do not limit the scope of this utility model. Conversely, any modifications and refinements made without departing from the spirit and scope of this utility model are within the scope of patent protection of this utility model.

Claims

1. A slag-resistant corundum-silicon carbide honeycomb brick, characterized in that: The brick body (1) includes a corundum-silicon carbide matrix (4), a transition layer (3) and a working layer (2), which are laid and pressed in sequence. The working layer (2) is provided with a number of channels (5). The channels (5) are hexagonal frustums arranged in a honeycomb pattern. The larger end of the channel (5) is located at the top of the working layer (2), and the smaller end of the channel (5) is located at the bottom of the working layer (2).

2. The slag-erosion-resistant corundum-silicon carbide honeycomb brick as described in claim 1, characterized in that: The channel (5) penetrates only the working layer (2). The diameter of the larger end of the channel (5) is 2.5-3.5 mm, the diameter of the smaller end of the channel (5) is 1.5-2.5 mm, and the wall thickness of the channel (5) is 0.8-1.2 mm.

3. The slag-erosion-resistant corundum-silicon carbide honeycomb brick as described in claim 1, characterized in that: The working layer (2) has a thickness of 10-20 mm, and the transition layer (3) has a thickness of 4-6 mm.

4. The slag-resistant corundum-silicon carbide honeycomb brick as described in claim 1, characterized in that: The transition layer (3) includes an upper transition layer (31), an intermediate transition layer (32) and a lower transition layer (33) arranged in sequence. The top surface of the upper transition layer (31) is connected to the bottom surface of the working layer (2), and the bottom surface of the lower transition layer (33) is connected to the top surface of the corundum-silicon carbide substrate (4).

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