A high-strength ceramic slag slurry pump guard plate and a preparation method thereof

Abstract

The application relates to the technical field of ceramic materials, and discloses a high-strength ceramic slag slurry pump guard plate and a preparation method thereof.A high-strength ceramic slag slurry pump guard plate is prepared from the following components by weight: 85-95 parts of silicon carbide, 3-5 parts of modified silicon carbide whisker, 4-6 parts of petroleum coke powder, 6-8 parts of a binder, 3-8 parts of a sintering aid, 3-5 parts of a dispersing agent and 50-60 parts of water; wherein the modified silicon carbide whisker is obtained by modifying silicon carbide whisker with 3-amino-2-hydroxyacetophenone.The above technical scheme solves the problem of insufficient strength of the ceramic slag slurry pump guard plate in the related art.

Description

Technical Field

[0001] This invention relates to the field of ceramic materials technology, specifically to a high-strength ceramic slurry pump protective plate and its preparation method. Background Technology

[0002] In industrial sectors such as mining and metallurgy, slurry pumps are core equipment for conveying slurries containing solid particles. Their internal protective plates not only need to withstand the scouring of high-speed slurry but also play a crucial role in optimizing flow channel characteristics and ensuring conveying efficiency. Due to their excellent wear resistance and chemical stability, ceramic materials are the preferred material for these protective plates. However, ceramic slurry pump protective plates must withstand the continuous impact of slurry over long periods of use, thus placing higher demands on their strength. Currently available ceramic protective plates generally suffer from insufficient strength. During service, this insufficiency easily leads to cracking, chipping, and other failures, resulting in pump impeller jamming, seal leakage, and other critical component malfunctions, potentially even safety accidents. Furthermore, it can damage the integrity of the flow channel, causing a significant decrease in conveying efficiency and an increase in energy consumption. Therefore, it is necessary to propose a high-strength ceramic slurry pump protective plate and its preparation method. Summary of the Invention

[0003] This invention proposes a high-strength ceramic slurry pump guard plate and its preparation method, which solves the problem of insufficient strength of ceramic slurry pump guard plates in related technologies.

[0004] The technical solution of the present invention is as follows:

[0005] This invention proposes a high-strength ceramic slurry pump guard plate, comprising the following raw materials in parts by weight: 85-95 parts silicon carbide powder, 3-5 parts modified silicon carbide whiskers, 4-6 parts petroleum coke powder, 6-8 parts binder, 3-8 parts sintering aid, 3-5 parts dispersant, and 50-60 parts water; wherein the modified silicon carbide whiskers are obtained by modifying silicon carbide whiskers with 3-amino-2-hydroxyacetophenone.

[0006] As a further technical solution, in the raw materials of the modified silicon carbide whiskers, the mass of 3-amino-2-hydroxyacetophenone is 4.3% to 6.1% of the mass of the silicon carbide whiskers, preferably 5.2%.

[0007] In the high-strength ceramic slurry pump guard plate of the present invention, when the mass of 3-amino-2-hydroxyacetophenone in the modified silicon carbide whiskers is 4.3% to 6.1% of the mass of silicon carbide whiskers, the bending strength of the ceramic slurry pump guard plate can be significantly improved. When the mass of 3-amino-2-hydroxyacetophenone is less than 4.3% of the mass of silicon carbide whiskers, 3-amino-2-hydroxyacetophenone cannot fully cover the surface of silicon carbide whiskers, resulting in limited improvement in its dispersibility. When the mass of 3-amino-2-hydroxyacetophenone is greater than 6.1% of the mass of silicon carbide whiskers, excessive 3-amino-2-hydroxyacetophenone will form multilayer adsorption on the surface of silicon carbide whiskers, which will destroy the dispersibility of silicon carbide whiskers and aggravate agglomeration. When the amount of 3-amino-2-hydroxyacetophenone is between 4.3% and 6.1%, it can just evenly cover the surface of silicon carbide whiskers, maximize its dispersibility, ensure that modified silicon carbide is evenly distributed in the ceramic slurry pump liner material, and thus further improve the bending strength of the high-strength ceramic slurry pump liner.

[0008] As a further technical solution, the preparation method of the modified silicon carbide whiskers includes the following steps: dispersing 3-amino-2-hydroxyacetophenone in a solvent, then adding silicon carbide whiskers, mixing, and drying to obtain modified silicon carbide whiskers.

[0009] As a further technical solution, the mixing temperature is 40~50℃ and the time is 2~4h.

[0010] As a further technical solution, the solvent is anhydrous ethanol, and the mass-to-volume ratio of the silicon carbide whiskers to anhydrous ethanol is 1g:10mL.

[0011] As a further technical solution, the length of the silicon carbide whisker is 10~50μm and the diameter is 0.1~1μm.

[0012] As a further technical solution, the raw materials for the sintering aid include gallium nitride and yttrium oxide.

[0013] In this invention, gallium nitride and yttrium oxide are used as sintering aids in the high-strength ceramic slurry pump liner, which significantly improves the fracture toughness of the liner. Yttrium oxide forms a low-melting-point liquid phase during sintering, which fully wets the surface of silicon carbide particles, fills the gaps between particles, reduces particle diffusion resistance, and promotes densification of the high-strength ceramic slurry pump liner. Gallium nitride synergistically adjusts the liquid phase composition with yttrium oxide to enhance the wetting effect and can also form a solid solution with silicon carbide. The synergistic effect of gallium nitride and yttrium oxide further enhances the fracture toughness of the high-strength ceramic slurry pump liner.

[0014] As a further technical solution, the mass ratio of gallium nitride to yttrium oxide is 3~6:10, preferably 2:5.

[0015] As a further technical solution, the dispersant includes one or two of ammonium citrate and polyethylene glycol.

[0016] As a further technical solution, the adhesive includes one or both of polyvinyl alcohol and sodium carboxymethyl cellulose.

[0017] This invention also proposes a method for preparing a high-strength ceramic slurry pump protective plate, comprising the following steps:

[0018] S1. After mixing silicon carbide, modified silicon carbide whiskers, petroleum coke powder, and sintering aid evenly, add dispersant, binder, and water to mix and obtain a mixture.

[0019] S2. After casting the mixture into a mold, it is sintered to obtain a high-strength ceramic slurry pump protective plate.

[0020] As a further technical solution, the sintering temperature is 1700~2000℃ and the sintering time is 0.5~1.5h.

[0021] The working principle and beneficial effects of this invention are as follows:

[0022] This invention significantly improves the strength of ceramic slurry pump liners by adding 3-amino-2-hydroxyacetophenone to modify silicon carbide whiskers. While the addition of silicon carbide whiskers can increase the strength of ceramic slurry pump liners, silicon carbide is prone to agglomeration and entanglement, hindering the full realization of the strength improvement effect. This invention uses 3-amino-2-hydroxyacetophenone to modify silicon carbide whiskers, effectively improving the agglomeration and entanglement problem. The modified silicon carbide whiskers exhibit better dispersibility in the matrix, further enhancing the strength of the ceramic slurry pump liners. Detailed Implementation

[0023] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0024] In the following examples and comparative examples, silicon carbide powder had a particle size of 74 μm; silicon carbide whiskers had a diameter of 0.1~0.6 μm and a length of 10~50 μm; petroleum coke powder had a particle size of 45 μm; yttrium oxide had a particle size of 1 μm; gallium nitride had a particle size of 74 μm and a purity of 99%; polyvinyl alcohol (PVA-1788); polyethylene glycol (PEG-400); sodium carboxymethyl cellulose (LT-011) was purchased from Renqiu Litian Chemical Co., Ltd.; and aluminum nitride had a particle size of 70 μm.

[0025] Example 1

[0026] A method for preparing a high-strength ceramic slurry pump protective plate includes the following steps:

[0027] S1. By weight, 85 parts silicon carbide powder, 3 parts modified silicon carbide whiskers, 4 parts petroleum coke powder, and 3 parts sintering aid are mixed evenly, and then 3 parts ammonium citrate, 6 parts polyvinyl alcohol, and 50 parts water are added and mixed to obtain a mixture; the sintering aid is yttrium oxide.

[0028] S2. After casting the mixture into a mold, sinter it at 1900℃ for 1 hour to obtain a high-strength ceramic slurry pump protective plate.

[0029] The method for preparing modified silicon carbide whiskers includes the following steps: dispersing 3-amino-2-hydroxyacetophenone in anhydrous ethanol, then adding silicon carbide whiskers, mixing at 45°C for 3 hours, and drying to obtain modified silicon carbide whiskers; wherein, the mass of 3-amino-2-hydroxyacetophenone is 4.3% of the mass of silicon carbide whiskers, and the mass-to-volume ratio of silicon carbide whiskers to anhydrous ethanol is 1 g: 10 mL.

[0030] Example 2

[0031] Compared with Example 1, the only difference in Example 2 is that in the preparation method of a high-strength ceramic slurry pump guard plate in this example, step S1 is as follows: by weight, 90 parts of silicon carbide powder, 4 parts of modified silicon carbide whiskers, 5 parts of petroleum coke powder, and 5 parts of sintering aid are mixed evenly, and then 2 parts of polyethylene glycol, 2 parts of ammonium citrate, 7 parts of sodium carboxymethyl cellulose and 55 parts of water are added and mixed to obtain a mixture.

[0032] Example 3

[0033] Compared with Example 1, the only difference in Example 3 is that in the preparation method of a high-strength ceramic slurry pump guard plate in this example, step S1 is as follows: by weight, 95 parts of silicon carbide powder, 5 parts of modified silicon carbide whiskers, 6 parts of petroleum coke powder, and 8 parts of sintering aid are mixed evenly, and then 5 parts of polyethylene glycol, 8 parts of polyvinyl alcohol, and 60 parts of water are added and mixed to obtain a mixture.

[0034] Example 4

[0035] Compared with Example 1, the only difference in Example 4 is that the mass of 3-amino-2-hydroxyacetophenone in this example is 5.2% of the mass of silicon carbide whiskers.

[0036] Example 5

[0037] Compared with Example 1, the only difference in Example 5 is that the mass of 3-amino-2-hydroxyacetophenone in this example is 6.1% of the mass of silicon carbide whiskers.

[0038] Example 6

[0039] Compared with Example 1, the only difference in Example 6 is that the sintering aid in this example is gallium nitride.

[0040] Example 7

[0041] Compared with Example 1, the only difference in Example 7 is that the sintering aid in this example is gallium nitride and yttrium oxide in a mass ratio of 3:10.

[0042] Example 8

[0043] Compared with Example 1, the only difference in Example 8 is that the sintering aid in this example is gallium nitride and yttrium oxide in a mass ratio of 2:5.

[0044] Example 9

[0045] Compared with Example 1, the only difference in Example 9 is that the sintering aid in this example is gallium nitride and yttrium oxide in a mass ratio of 3:5.

[0046] Example 10

[0047] Compared with Example 7, the only difference in Example 10 is that gallium nitride is replaced with an equal amount of aluminum nitride in this example.

[0048] Comparative Example 1

[0049] Compared with Example 1, the only difference in Comparative Example 1 is that the modified silicon carbide whiskers were replaced with an equal amount of silicon carbide whiskers.

[0050] The high-strength ceramic slurry pump guard plates prepared in Examples 1-10 and Comparative Example 1 were tested according to the following method:

[0051] 1. Bending strength test: The bending strength test shall be conducted in accordance with the test method (three-point bending method) specified in standard GB / T6569-2006 "Test Method for Bending Strength of Fine Ceramics";

[0052] 2. Fracture toughness test: The fracture toughness test shall be conducted in accordance with the test method specified in standard GB / T 23806-2009 "Test Method for Fracture Toughness of Fine Ceramics - Single-sided Precracked Beam (SEPB) Method";

[0053] The test results are shown in Tables 1 and 2:

[0054] Table 1. Test results of bending strength of the protective plate for high-strength ceramic slurry pumps.

[0055]

[0056] As shown in Table 1, the comparison between Examples 1-5 and Comparative Example 1 indicates that the high-strength ceramic slurry pump guard plate of the present invention can significantly improve the bending strength of the ceramic slurry pump guard plate by adding 3-amino-2-hydroxyacetophenone modified silicon carbide whiskers.

[0057] Table 2. Test results of fracture toughness of the protective plate for high-strength ceramic slurry pumps.

[0058]

[0059] As shown in Table 2, the comparison between Examples 7-9 and Examples 1, 6, and 10 indicates that the high-strength ceramic slurry pump guard plate of the present invention can significantly improve the fracture toughness of the ceramic slurry pump guard plate by adding a sintering aid composed of gallium nitride and yttrium oxide.

[0060] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A high-strength ceramic slurry pump protective plate, characterized in that, The raw material comprises the following components in parts by weight: 85-95 parts silicon carbide powder, 3-5 parts modified silicon carbide whiskers, 4-6 parts petroleum coke powder, 6-8 parts binder, 3-8 parts sintering aid, 3-5 parts dispersant, and 50-60 parts water; wherein the modified silicon carbide whiskers are obtained by modifying silicon carbide whiskers with 3-amino-2-hydroxyacetophenone. The sintering aid consists of gallium nitride and yttrium oxide in a mass ratio of 2:

5.

2. The high-strength ceramic slurry pump protective plate according to claim 1, characterized in that, In the raw materials for the modified silicon carbide whiskers, the mass of 3-amino-2-hydroxyacetophenone is 4.3% to 6.1% of the mass of the silicon carbide whiskers.

3. The high-strength ceramic slurry pump protective plate according to claim 1, characterized in that, The method for preparing the modified silicon carbide whiskers includes the following steps: dispersing 3-amino-2-hydroxyacetophenone in a solvent, then adding silicon carbide whiskers, mixing, and drying to obtain modified silicon carbide whiskers.

4. The high-strength ceramic slurry pump protective plate according to claim 1, characterized in that, The silicon carbide whiskers have a length of 10~50μm and a diameter of 0.1~1μm.

5. A high-strength ceramic slurry pump protective plate according to claim 1, characterized in that, The dispersant includes one or both of ammonium citrate and polyethylene glycol.

6. A high-strength ceramic slurry pump protective plate according to claim 1, characterized in that, The adhesive includes one or both of polyvinyl alcohol and sodium carboxymethyl cellulose.

7. A method for preparing a high-strength ceramic slurry pump protective plate, used to prepare a high-strength ceramic slurry pump protective plate as described in any one of claims 1 to 6, characterized in that, Includes the following steps: S1. After mixing silicon carbide powder, modified silicon carbide whiskers, petroleum coke powder, and sintering aid evenly, add dispersant, binder, and water to mix and obtain a mixture. S2. After casting the mixture into a mold, it is sintered to obtain a high-strength ceramic slurry pump protective plate.

8. The method for preparing a high-strength ceramic slurry pump protective plate according to claim 7, characterized in that, The sintering temperature is 1700~2000℃, and the sintering time is 0.5~1.5h.

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