A preparation method of mixed ceramic corundum abrasive

Abstract

The present invention belongs to the field of abrasive preparation, and specifically relates to a method for preparing a mixed ceramic corundum abrasive, which is characterized by the following steps: 1) placing alumina powder into a ball mill, adding water of equal mass, and ball milling until the powder is d 50 The particle size is 8-12 μm to obtain slurry A; 2) boehmite powder, phosphoric acid with a mass concentration of 20-30%, and water are mixed in a mass ratio of 1:4.5:4.5, and stirred until a sol state is obtained to obtain slurry B. The particles d in slurry B are 50 Particle size is less than 1μm; 3) slurry A, slurry B, d 50 White corundum particles with a particle size of 25-35 μm are mixed in a mass ratio of 2.8-3.2:4.5-5.5:3, a shrinkage binder and a sintering aid are added and mixed again, and the mixed slurry is dried in an 80°C drying chamber; 4) calcined to obtain a block abrasive; 5) crushed and graded. Advantages of this invention include: 1) a simple process, low equipment investment, and low production cost; 2) the abrasive has good microscopic compactness and high density.

Description

Technical Field

[0001] The invention belongs to the field of abrasive preparation, and in particular relates to a method for preparing a hybrid ceramic corundum abrasive between single crystal corundum abrasive and ceramic corundum abrasive. Background Art

[0002] Alumina is widely used in production and daily life due to its vast mineral reserves. Alpha alumina (corundum), a type of alumina, has been used as an abrasive since the late 19th century due to its exceptional hardness. While subsequent developments in society and technology have led to the development of superior abrasives such as diamond and silicon carbide, their production costs remain competitive with corundum. Furthermore, corundum abrasives still offer significant advantages in machining titanium alloys, nickel-based superalloys, and precision components such as bearings and turbine blades. Currently, corundum abrasives are primarily classified into two categories. The first category includes white corundum produced through traditional electrofusion processes, as well as brown corundum and chrome corundum derived through the addition of mineral elements. These products primarily feature single crystal structures. The second category includes ceramic corundum abrasives, produced by sol-gel methods using nano-sized alumina particles and then sintered. These particles are typically aggregates of microcrystals measuring tens to hundreds of nanometers.

[0003] The production of the first type of corundum abrasive represented by white corundum is relatively simple. For example, the invention patent technology with publication number CN107541189A, published on January 5, 2018, is titled "A production method for ensuring stable particle size composition of zirconium corundum abrasive". It uses an electric arc furnace to melt alumina powder and then cools, crushes and grades it. However, this process has high temperature and high energy consumption, and the single crystal corundum abrasive will undergo transcrystalline fracture and fall off as a whole during the grinding process, resulting in high wear rate and poor grinding life. On the other hand, passivation may also occur during the grinding process of the single crystal corundum abrasive, resulting in ineffective grinding and then burning the workpiece surface.

[0004] The particles of ceramic corundum abrasive are formed by the aggregation of nano-scale microcrystals. For example, the invention patent technology of a nanocrystalline blue ceramic corundum abrasive and its preparation method, published on November 9, 2016, with publication number CN106083001A, adopts the sol-gel method to prepare the aluminum-containing precursor, introduces additives, and then obtains the ceramic corundum abrasive through granulation, screening, calcination and other processes. The ceramic corundum abrasive has sufficient toughness and a long grinding life. In addition, as the particles fail and fall off during the grinding process, a large amount of heat is taken away. Therefore, the protection of the workpiece surface is also significantly better than that of white corundum abrasive. However, there are also several problems in the production and use of ceramic corundum abrasives:

[0005] First, in terms of production, the production technology patents for mature products are still mainly in the hands of foreign companies. Faced with these patent technology barriers, domestic companies can only make major changes based on the corresponding technology to circumvent the restrictions of these patents. In fact, the reason why foreign patented technologies are certain formulas or methods is because foreign researchers have verified and optimized them through experiments. In other words, methods that are significantly different from existing patented technologies are often difficult to achieve the same results as existing patented technologies in terms of product performance. This means that it is difficult to surpass or achieve the performance of existing patented products by developing new technologies based on the existing sol-gel method.

[0006] Secondly, in terms of actual application performance, although ceramic corundum abrasives are significantly better than single crystal corundum abrasives, they are not without disadvantages. Although ceramic corundum abrasives are self-sharpening, because their constituent particles are nanocrystalline, the scale of the new grinding edge produced by the shedding of small particles is usually relatively small. This has a positive impact on the flatness of the workpiece being ground, but its grinding speed is also limited, resulting in low grinding efficiency.

[0007] Finally, in terms of product price, the price of ceramic corundum abrasive is much higher than that of traditional single crystal corundum abrasive, resulting in no significant improvement in the cost-effectiveness of its use. Summary of the Invention

[0008] The present invention aims to provide a method for preparing a hybrid ceramic corundum abrasive. The hybrid ceramic corundum abrasive is prepared by mixing white corundum single crystal particles and alumina microcrystals prepared by a sol-gel method, adding industrial alumina powder and other additives, and sintering the mixture at high temperature. The hybrid ceramic corundum abrasive combines the advantages of high toughness and long grinding life of ceramic corundum abrasive with the high hardness and low price of single crystal corundum abrasive. The hybrid ceramic corundum abrasive has low production cost, a grinding speed superior to that of white corundum abrasive and microcrystalline ceramic corundum abrasive, a grinding life significantly longer than that of white corundum abrasive, and a good grinding cost-effectiveness.

[0009] The present invention is achieved through the following technical solutions:

[0010] That is, a method for preparing a hybrid ceramic corundum abrasive, comprising the following steps:

[0011] 1) Place industrial grade alumina powder into a ball mill, add water of equal mass, and mill until the powder is d 50 The particle size is 8~12μm, and slurry A is obtained;

[0012] 2) Boehmite powder, phosphoric acid with a mass concentration of 20-30%, and water were mixed in a mass ratio of 1:4.5:4.5, and stirred by high-speed shearing until a sol state was obtained to obtain slurry B. Particles d in slurry B 50 Particle size less than 1 μm;

[0013] 3) Mix slurry A, slurry B, and d 50White corundum particles with a particle size of 25-35 μm are mixed in a mass ratio of 2.8-3.2:4.5-5.5:3, and then shrinkage binder and sintering aid are added and mixed again. The mixed slurry is placed in a drying room at 80°C for drying;

[0014] 4) The dried solid block is transferred to a high-temperature furnace for calcination to obtain a block-shaped hybrid ceramic corundum abrasive;

[0015] 5) The sintered blocky mixed ceramic corundum abrasive is crushed and graded to obtain mixed ceramic corundum abrasives of different particle sizes.

[0016] In step 2) of the present invention, the sol-like slurry B is prepared by using phosphoric acid which is not commonly used in the art. Phosphoric acid is a medium-strong acid, has no volatile pollution, is easy to purchase, safe to use, and environmentally friendly.

[0017] In step 2) of the present invention, it is preferred but not limited to use a propeller stirrer for high-speed shear stirring.

[0018] Furthermore, the main components of the product of the present invention are: 50 White corundum particles with a particle size of 25~35μm, d 50 Industrial alumina powder with a particle size of 8-12μm, d 50 The alumina sol has a particle size of 0.8~1.0μm, and the mass ratio of alumina among the three is 6:2.8~3.2:0.9~1.1.

[0019] Furthermore, the white corundum particles in step 3) of the present invention are obtained by crushing and screening fused white corundum.

[0020] Furthermore, the present invention uses the mass of aluminum oxide in slurry A, slurry B and white corundum particles as a benchmark, and the shrinkage binder is 0.1% by mass of sweet potato starch.

[0021] The sweet potato starch in the present invention has the advantages of high drying shrinkage and high powder density.

[0022] Furthermore, the present invention uses the mass of alumina in slurry A, slurry B and white corundum particles as a benchmark, and the sintering aids are 4-6% by mass of glass powder and 0.2% by mass of fluorite powder.

[0023] The function of the glass powder in the present invention is to promote the bonding strength between particles during the sintering process.

[0024] The function of the fluorite powder in the present invention is to reduce the sintering temperature and improve the fluidity and permeability of the melt.

[0025] Furthermore, the heating process of the high-temperature furnace during calcination in step 4) of the present invention is as follows: starting from room temperature, heating to 900°C over 3 hours, maintaining at 900°C for 1 hour, then heating to 1500-1550°C over 2 hours, maintaining for 3-4 hours, and then stopping heating, and the material is cooled along with the furnace.

[0026] During calcination, the temperature is first raised to 900°C and kept at this temperature for 1 hour to allow the fluid formed by the molten glass powder to evenly penetrate the interfaces of the alumina particles and to remove gases that may be generated during the heating process, such as gas products generated by the high-temperature decomposition of starch.

[0027] 1500~1550℃ is the final sintering temperature, which forms a strong bond between the alumina particles, thus becoming a block abrasive with high hardness, high density and good toughness.

[0028] The beneficial effects of the present invention are:

[0029] 1) Simple process, low equipment investment, and low production cost. Industrial alumina powder has low cost, and processing it into industrial alumina powder slurry with a d50 particle size of 8-12μm only requires a ball mill. The processing technology is simple and the equipment investment is small. White corundum particles have low cost, and you can directly purchase the finished product or obtain white corundum particles with a d50 particle size of 25~35μm through simple crushing and screening. The processing technology is simple and the equipment investment is small. Alumina sol with a d50 particle size of 0.8~1.0μm can be produced by using a conventional reactor equipped with a high-speed propeller stirrer. The processing technology is simple and the equipment investment is small. The sintering temperature does not exceed 1600℃, and conventional rotary kilns and tunnel kilns can be used, reducing equipment investment. The amount of boehmite and phosphoric acid used is not large, which further reduces costs, and phosphoric acid is not subject to restrictions on hazardous chemical procurement.

[0030] 2) The hybrid ceramic corundum abrasive prepared by the present invention has good microscopic compactness and high density. In short-term grinding applications, the grinding speed is better than that of white corundum abrasive and microcrystalline ceramic corundum abrasive, and the grinding ratio is slightly lower than that of microcrystalline ceramic corundum abrasive, but significantly better than that of white corundum abrasive. In long-term grinding applications, it can still maintain a good grinding speed. Although the grinding ratio is lower than that of microcrystalline ceramic corundum abrasive, it has a cost advantage, that is, a good grinding cost-effectiveness ratio. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 This is a SEM image of the micromorphology of the hybrid ceramic corundum abrasive prepared in Example 1 of the present invention;

[0032] Figure 2 This is a SEM image of the micromorphology of the hybrid ceramic corundum abrasive prepared in Example 2 of the present invention;

[0033] Figure 3 This is a SEM image of the micromorphology of the hybrid ceramic corundum abrasive prepared in Example 3 of the present invention;

[0034] Figure 4 This is a SEM image of the microstructure of comparative sample 1 prepared in comparative example 1 of the present invention;

[0035] Figure 5 This is a SEM image of the microstructure of comparative sample 2 prepared in comparative example 2 of the present invention;

[0036] Figure 6 This is a graph showing the laser particle size analyzer test results of the particle size distribution of white corundum particles in the raw materials of Example 3 of the present invention;

[0037] Figure 7 This is a graph showing the test results of the laser particle size analyzer on the alumina powder in slurry A of Example 3 of the present invention;

[0038] Figure 8 This is a graph showing the test results of the laser particle size analyzer on the aluminum oxide particles in slurry B of Example 3 of the present invention. DETAILED DESCRIPTION

[0039] The present invention will be further described below with reference to the embodiments.

[0040] Example 1: A method for preparing a hybrid ceramic corundum abrasive described in this embodiment comprises the following steps:

[0041] 1) Weigh 100 g of industrial-grade alumina powder and place it in a 1 L ball mill. Add 100 ml of water, 20 20 mm diameter alumina grinding balls, 40 15 mm diameter grinding balls, and 40 10 mm diameter grinding balls, and ball mill to obtain slurry A.

[0042] After the laser particle size analyzer test, the powder size of alumina powder in slurry A is d 50 Particle size is 8 μm;

[0043] 2) Weigh 40 g of boehmite powder, add 180 ml of 20% phosphoric acid and 180 ml of water, and stir with a high-speed stirrer to obtain a sol-like slurry B;

[0044] After the laser particle size analyzer test, the powder size of the alumina powder in slurry B is d 50 Particle size less than 1 μm;

[0045] 3) Mix 168g of slurry A, 270g of slurry B and 180g of particle size d 50 Stir and mix 30μm white corundum particles, then add 0.3g sweet potato starch, 0.6g fluorite powder and 17.5g glass powder and stir and mix again. The resulting slurry is placed in a drying room at 80℃ and dried for 10 hours;

[0046] The calculation method for the addition amount of sweet potato starch, fluorite powder and glass powder is as follows:

[0047] 168g of slurry A contains 84g of aluminum oxide, 270g of slurry B contains 27g of aluminum oxide, and 180g of particle size d 50 The 30μm white corundum particles are regarded as 180g of aluminum oxide, and the total amount of aluminum oxide is 291g;

[0048] The amount of sweet potato starch added is 291×0.1%=0.291g≈0.3g;

[0049] The amount of fluorite powder added is 291×0.2%=0.582g≈0.6g;

[0050] The amount of glass powder added is 291×6%=17.46g≈17.5g;

[0051] After the laser particle size analyzer test, the powder d of alumina powder in white corundum particles 50 Particle size is 35 μm;

[0052] 4) The dried solid block is transferred to a high-temperature furnace for calcination. The heating program is as follows: starting from room temperature, the temperature is raised to 900°C over 3 hours, then maintained at 900°C for 1 hour, then raised to 1550°C over 2 hours, and then maintained at 1550°C for 4 hours before heating is stopped. The material is cooled in the furnace to obtain a block-shaped hybrid ceramic corundum abrasive.

[0053] 5) The sintered blocky mixed ceramic corundum abrasive is crushed and graded to obtain mixed ceramic corundum abrasives of different particle sizes.

[0054] Figure 1 This is the SEM image of the micromorphology of the hybrid ceramic corundum abrasive prepared in this example.

[0055] Example 2, a method for preparing a hybrid ceramic corundum abrasive described in this example, the steps are as follows:

[0056] 1) Weigh 100 g of industrial-grade alumina powder and place it in a 1 L ball mill. Add 100 ml of water, 20 20 mm diameter alumina grinding balls, 40 15 mm diameter grinding balls, and 40 10 mm diameter grinding balls, and ball mill to obtain slurry A.

[0057] After the laser particle size analyzer test, the powder size of alumina powder in slurry A is d 50 Particle size is 12 μm;

[0058] 2) Weigh 40 g of boehmite powder, add 180 ml of 25% phosphoric acid and 180 ml of water, and stir with a high-speed stirrer to obtain a sol-like slurry B;

[0059] After the laser particle size analyzer test, the powder size of the alumina powder in slurry B is d 50 Particle size less than 1 μm;

[0060] 3) Mix 192g slurry A, 330g slurry B and 180g particle size d 50 Stir and mix 30μm white corundum particles, then add 0.3g sweet potato starch, 0.6g fluorite powder and 12.4g glass powder and stir and mix again. The resulting slurry is placed in a drying room at 80℃ and dried for 10 hours;

[0061] The calculation method for the addition amount of sweet potato starch, fluorite powder and glass powder is as follows:

[0062] 192g of slurry A contains 96g of aluminum oxide, 330g of slurry B contains 33g of aluminum oxide, and 180g of particle size d 50 The 30μm white corundum particles are regarded as 180g of aluminum oxide, and the total amount of aluminum oxide is 309g;

[0063] The amount of sweet potato starch added is 309×0.1%=0.309g≈0.3g;

[0064] The amount of fluorite powder added is 309×0.2%=0.618g≈0.6g;

[0065] The amount of glass powder added is 309×4%=12.36g≈12.4g;

[0066] After the laser particle size analyzer test, the powder d of alumina powder in white corundum particles 50 Particle size is 30 μm;

[0067] 4) The dried solid block is transferred to a high-temperature furnace for calcination. The heating program is as follows: starting from room temperature, the temperature is raised to 900°C over 3 hours, then kept at 900°C for 1 hour, then raised to 1500°C over 2 hours, and kept at 1500°C for 3 hours before heating is stopped. The material is cooled in the furnace to obtain a block-shaped hybrid ceramic corundum abrasive.

[0068] 5) The sintered blocky mixed ceramic corundum abrasive is crushed and graded to obtain mixed ceramic corundum abrasives of different particle sizes.

[0069] Figure 2 This is the SEM image of the micromorphology of the hybrid ceramic corundum abrasive prepared in this example.

[0070] Example 3, a method for preparing a hybrid ceramic corundum abrasive described in this embodiment, the steps are as follows:

[0071] 1) Weigh 100 g of industrial-grade alumina powder and place it in a 1 L ball mill. Add 100 ml of water, 20 20 mm diameter alumina grinding balls, 40 15 mm diameter grinding balls, and 40 10 mm diameter grinding balls, and ball mill to obtain slurry A.

[0072] like Figure 7 As shown: After the laser particle size analyzer test, the powder d of alumina powder in slurry A50 Particle size is 10 μm;

[0073] 2) Weigh 40 g of boehmite powder, add 180 ml of commercially available 30% phosphoric acid and 180 ml of water, and stir with a high-speed stirrer to obtain a sol-like slurry B;

[0074] like Figure 8 As shown: After the laser particle size analyzer test, the powder d of alumina powder in slurry B 50 Particle size less than 1 μm;

[0075] 3) Mix 180g slurry A, 300g slurry B and 180g particle size d 50 Stir and mix 30μm white corundum particles, then add 0.3g sweet potato starch, 0.6g fluorite powder and 15g glass powder and stir and mix again, and place the formed slurry in an 80℃ drying room to dry for 10 hours;

[0076] The calculation method for the addition amount of sweet potato starch, fluorite powder and glass powder is as follows:

[0077] 180g of slurry A contains 90g of aluminum oxide, 300g of slurry B contains 30g of aluminum oxide, and the particle size of 180g is d 50 The 30μm white corundum particles are regarded as 180g of aluminum oxide, and the total amount of aluminum oxide is 300g.

[0078] The amount of sweet potato starch added is 300×0.1%=0.3g;

[0079] The amount of fluorite powder added is 300×0.2%=0.6g;

[0080] The amount of glass powder added is 300×5%=15g;

[0081] like Figure 6 As shown: After the laser particle size analyzer test, the powder d of alumina powder in white corundum particles 50 Particle size is 30 μm;

[0082] 4) The dried solid block is transferred to a high-temperature furnace for calcination. The heating program is as follows: starting from room temperature, the temperature is raised to 900°C over 3 hours, then maintained at 900°C for 1 hour, then raised to 1520°C over 2 hours, and then maintained at 1520°C for 3.5 hours before heating is stopped. The material is cooled in the furnace to obtain a block-shaped hybrid ceramic corundum abrasive.

[0083] 5) The sintered blocky mixed ceramic corundum abrasive is crushed and graded to obtain mixed ceramic corundum abrasives of different particle sizes.

[0084] Figure 3 This is the SEM image of the micromorphology of the hybrid ceramic corundum abrasive prepared in this example.

[0085] Comparative Example 1, as a comparative sample of Example 3, under the condition that other conditions remain unchanged, no d 50 The abrasive prepared from industrial alumina powder with a particle size of 10 μm is recorded as comparative sample 1.

[0086] Figure 4 This is the SEM image of the microstructure of comparison sample 1.

[0087] Comparative Example 2, as a comparison sample of Example 3, only slurry B in Example 3 was used to prepare a ceramic corundum abrasive by a sol-gel method, which was recorded as Comparative Sample 2.

[0088] Figure 5 This is the SEM image of the microstructure of comparison sample 2.

[0089] Performance test analysis:

[0090] 1. Microscopic morphology observation:

[0091] Depend on Figure 1 、 Figure 2 、 Figure 3 It can be seen that by combining three types of aluminum oxide particles with different particle size distributions, the hybrid ceramic corundum abrasives obtained in Examples 1-3 have very good microscopic density and no obvious pores.

[0092] Figure 4 The SEM image of the microstructure of sample 1 is shown in Figure d. 50 There are a lot of pores in the sintered body of white corundum particles with a diameter of 30 μm, which will inevitably affect its volume density and bonding strength.

[0093] Figure 5 This is the SEM image of the microstructure of comparison sample 2. The microstructural uniformity of comparison sample 2 is very good, which reflects the advantages of microcrystalline ceramic corundum abrasive in microstructure. However, it cannot be ignored that the relatively single particle size distribution makes it impossible for the particles to completely fill the pores between the particles.

[0094] 2. Density test:

[0095] The density of the hybrid ceramic corundum abrasive prepared in Example 3 was 3.92 g / cm 3 The density of comparative sample 1 is 2.96 g / cm 3 The density of comparison sample 3 is 3.90g / cm 3 .

[0096] It can be seen that by combining alumina particles of different sizes, the medium particles fill the gaps between large particles, while the small particles fill the gaps between the medium particles, thereby ensuring the bonding density of the sintered body to the greatest extent.

[0097] 3. Grinding performance test

[0098] The mixed ceramic corundum abrasive obtained in Example 3 was crushed and sieved, and the particles that passed through a 45-mesh sieve but could not pass through a 50-mesh sieve were made into a 20 mm diameter circular grinding disc, which was recorded as grinding disc 1;

[0099] The microcrystalline ceramic corundum abrasives made from the same particle size of fused white corundum abrasive and comparative sample 2 were also made into circular grinding discs with a diameter of 20 mm, marked as grinding disc 2 and grinding disc 3, as a comparative group.

[0100] A 4-inch diameter woodworking saw blade was used as the test specimen to be ground. The three grinding discs were placed in contact with the saw blade at a contact pressure of 0.5 kgf. The contact area was a circular area 20 to 40 mm from the center of the saw blade. The saw blade was rotated at 600 rpm. The mass loss of the saw blade and the grinding disc was measured after grinding for 10 and 60 minutes, respectively. The grinding performance of the abrasives was evaluated based on this. The saw blade grinding performance test results are shown in Table 1:

[0101] Table 1

[0102]

[0103] The data in the table shows that in short-term grinding applications such as 10 minutes, the saw blade mass removal effect of Grinding Plate 1 and Grinding Plate 2 is better than that of Grinding Plate 3. Grinding Plate 1 and Grinding Plate 2 both contain single crystals with larger particles. Large particles lead to more surface protrusions per unit contact area, so the material removal rate will be higher.

[0104] As shown in Table 1, for the short-term grinding of 10 minutes, from the perspective of grinding ratio (i.e. the mass loss ratio of saw blade to grinding wheel), grinding wheel 3 is better, reaching 3.77; grinding wheel 1 also reaches 3.75, while grinding wheel 2 is only 2.76 due to factors such as transgranular fracture and falling of the fused white corundum abrasive.

[0105] That is, the grinding tools made of white corundum abrasive have a fast grinding speed and high loss, while the grinding tools made of microcrystalline ceramic corundum have a slightly slower grinding speed but very low loss. The hybrid ceramic corundum abrasive prepared by the present invention combines the high hardness of white corundum particles and the high toughness of microcrystalline corundum abrasive to achieve a fast grinding speed while maintaining low loss, and its comprehensive grinding performance is significantly better than that of the three abrasives.

[0106] As shown in Table 1, for 60 minutes of long-term grinding, grinding disc 2 exhibits the worst grinding performance, with the slowest grinding speed and the worst grinding ratio of only 1.93. In contrast, the microcrystalline ceramic corundum abrasive of grinding disc 3 benefits from its self-sharpening and shedding microparticles that take away grinding heat. While achieving high-speed grinding and removal, its own wear is very low, and the grinding ratio is still 3.35. Although the hybrid ceramic corundum abrasive prepared by the present invention still has the fastest grinding speed, its advantage over the microcrystalline ceramic corundum abrasive is no longer obvious, and the grinding ratio has dropped from 3.75 at 10 minutes to 2.88.

[0107] That is, actual tests show that the hybrid ceramic corundum abrasive prepared by the present invention has a better grinding speed than white corundum abrasive and microcrystalline ceramic corundum abrasive in short-term grinding applications, and a grinding ratio slightly lower than that of microcrystalline ceramic corundum abrasive, but significantly better than white corundum abrasive; in long-term grinding applications, it can still maintain a good grinding speed, but the grinding ratio is significantly reduced, which is lower than that of microcrystalline ceramic corundum abrasive. However, due to the low cost of the present invention, it has a cost advantage compared with microcrystalline ceramic corundum abrasive.

[0108] The present invention is described above by way of example. It should be noted that, without departing from the core of the present invention, any simple modification and equivalent replacement that can be made by those skilled in the art without inventive effort fall within the scope of protection of the present invention.

Claims

1. A method for preparing a hybrid ceramic corundum abrasive, characterized in that: The following steps are involved: 1) Place industrial grade alumina powder into a ball mill, add water of equal mass, and mill until the powder is d 50 The particle size is 8~12μm, and slurry A is obtained; 2) Boehmite powder, phosphoric acid with a mass concentration of 20-30%, and water were mixed in a mass ratio of 1:4.5:4.5, and stirred by high-speed shearing until a sol state was obtained to obtain slurry B. Particles d in slurry B 50 Particle size less than 1 μm; 3) Mix slurry A, slurry B, and d 50 White corundum particles with a particle size of 25~35μm are mixed in a mass ratio of 2.8~3.2:4.5~5.5:3, and then shrinkage binder and sintering aid are added and mixed again. The mixed slurry is placed in a drying room at 80℃ for drying. 50 White corundum particles with a particle size of 25~35μm, d 50 Industrial alumina powder with a particle size of 8-12μm, d 50 Alumina sol with a particle size of less than 1 μm, the mass ratio of aluminum oxide among the three is 6:2.8~3.2:0.9~1.1; 4) The dried solid block is transferred to a high-temperature furnace for calcination to obtain a block-shaped hybrid ceramic corundum abrasive; 5) The sintered blocky mixed ceramic corundum abrasive is crushed and graded to obtain mixed ceramic corundum abrasives of different particle sizes.

2. The method for preparing a hybrid ceramic corundum abrasive according to claim 1, wherein: The white corundum particles in step 3) are obtained by crushing and screening the fused white corundum.

3. The method for preparing a hybrid ceramic corundum abrasive according to claim 1, wherein: Based on the mass of alumina in slurry A, slurry B and white corundum particles, the shrinkage binder is 0.1% by mass of sweet potato starch.

4. The method for preparing a hybrid ceramic corundum abrasive according to claim 1, wherein: Based on the mass of alumina in slurry A, slurry B and white corundum particles, the sintering aids are 4-6% by mass of glass powder and 0.2% by mass of fluorite powder.

5. The method for preparing a hybrid ceramic corundum abrasive according to claim 1, wherein: During the calcination in step 4), the temperature of the high-temperature furnace is raised from room temperature to 900° C. over 3 hours, then kept at 900° C. for 1 hour, then raised to 1500-1550° C. over 2 hours, kept at that temperature for 3-4 hours, and then stopped heating. The material is cooled in the furnace.

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