Agglomerated ceramic abrasive and preparation method thereof

Abstract

The invention relates to an agglomerated ceramic abrasive which is prepared from the following raw materials in percentage by weight: 25-30% of a ceramic bond, 65-70% of diamond micro-powder, 1-3% of titanium powder, 2.5-5% of nitrate, 0.3-0.5% of nickel sulfate and 1-3% of aluminum zirconate, and is prepared by the following steps: adding water into the raw materials, uniformly mixing, and grinding; and then carrying out spray granulation, impurity drying and sintering to obtain the agglomerated ceramic abrasive material. Compared with a common ceramic bond diamond agglomerated abrasive material, the agglomerated ceramic abrasive material prepared by the method has the advantages of high hardness, uniform particle distribution, good grinding performance and the like. When the agglomerated ceramic abrasive is used for polishing marble tiles, no obvious scratches appear on the surfaces of the tiles, the surface consistency is good, and the polishing efficiency of the marble tiles is high.

Description

Technical Field

[0001] The invention relates to agglomerated ceramic abrasive and a preparation method thereof, belonging to the field of ceramic abrasives. Background Art

[0002] Agglomerated ceramic abrasive is a new type of abrasive that uses a special process to bond a large number of fine, irregular abrasives together to form a combined abrasive agglomerate with a certain size, shape and strength. This abrasive has significant advantages in grinding, especially in improving grinding efficiency and reducing the surface roughness of workpieces. Agglomerated ceramic abrasives are mainly composed of three elements: abrasives, pores and binders. Abrasives are the main materials for grinding; binders are used to bond fine abrasives together to form large abrasive agglomerates with a certain strength; pores have the function of temporarily storing grinding chips and coolant to prevent grinding chips from being retained on the surface of the workpiece or the workpiece from being burned due to excessive grinding temperature. Agglomerated ceramic abrasives are widely used in the processing of silicon carbide, sapphire and semiconductors due to their excellent self-sharpening, high temperature resistance, chemical corrosion resistance and high cutting force that can maintain stable grinding tools. Common preparation technologies for agglomerated ceramic abrasives include molding or casting crushing method, rolling method, spray drying method, inverse microemulsion polymerization method, and sieve plate extrusion method. In the existing agglomerated ceramic abrasives, due to the unreasonable ratio of binder and agglomerated ceramic abrasive, the diamond particles are unevenly coated and the holding force is low, which affects the service life of the abrasive. At the same time, the prepared ceramic abrasive particles are large in size, resulting in high surface roughness of the workpiece being polished during the polishing process of the accumulated abrasive. Summary of the invention

[0003] The invention provides an agglomerated ceramic abrasive and a preparation method thereof, which solves the problems that the existing agglomerated ceramic abrasive has uneven coating on diamond particles, low holding force, and affects the service life of the abrasive; and the prepared ceramic abrasive particles are large in size, resulting in high surface roughness of the workpiece being polished during the polishing process when the abrasive is accumulated.

[0004] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0005] The invention discloses an agglomerated ceramic abrasive. The raw materials of the agglomerated ceramic abrasive include, by weight percentage, 25-30% ceramic binder, 65-70% diamond powder, 1-3% titanium powder, 2.5-5% nitrate, 0.3-0.5% nickel sulfate and 1-3% aluminum zirconate.

[0006] Furthermore, preferably: the raw materials of the agglomerated ceramic abrasive, by weight percentage, include 25% ceramic binder, 65% diamond powder, 3% titanium powder, 5% nitrate, 0.5% nickel sulfate, and 1.5% aluminum zirconate.

[0007] Further, preferably: the ceramic binder is composed of the following raw materials: Na 2 O 9%, silane coupling agent 0.5%, titanate coupling agent 0.5%, Al 2 O 3 12%, B 2 O 3 33%, SiO 2 45%.

[0008] Furthermore, preferably: the silane coupling agent is KH-550 or KH-560.

[0009] Furthermore, preferably: the titanate coupling agent is TMC-301 or TMC-401.

[0010] Further, preferably: the preparation method of the ceramic binder is as follows:

[0011] (1) using pseudo-boehmite as an aluminum source and 10% HNO3 as a peptizing agent, preparing aluminum sol under the conditions of n(H+) / n(AlOOH) of 0.06, a temperature of 50°C, and a solid content of 10%;

[0012] (2) using tetraethyl orthosilicate as a silicon source and anhydrous ethanol as a peptizing agent, preparing silica sol under the conditions of n(TEOS):n(EtOH):n(H2O):n(HNO3)=1:3.2:6.5:0.087, reaction temperature 60°C, rotation speed 200r / min, reaction time 2h;

[0013] (3) Adding boric acid and sodium nitrate to the aluminum sol in sequence and stirring to mix evenly, then adding the silica sol, continuing to heat, maintaining the temperature at 70°C, rotating at 200 r / min, stirring for 1 hour, allowing the substances in the solution to fully hydrolyze, then adding the silane coupling agent and titanate coupling agent, rotating at 200 r / min, stirring for 30 minutes, and mixing evenly;

[0014] (4) The mixed sol is aged at 100-120° C. for 24-36 h, and then ball-milled through a 200-mesh sieve to obtain a ceramic binder.

[0015] The method for preparing the agglomerated ceramic abrasive of the present invention comprises the following steps:

[0016] (1) mixing ceramic binder, diamond powder, titanium powder, molten salt, nickel sulfate and aluminum zirconate in proportion, then adding water so that the solid content of the liquid is 65-70%, and using a ball mill or ultrasonic dispersing equipment to evenly disperse the mixture to ensure that each component is evenly distributed;

[0017] (2) spray granulation; the spray pressure is 0.4-0.6MPa, the air inlet temperature is 200-220°C, the outlet temperature is 100-110°C, the spray hole diameter is 0.4-0.5mm, and the spray granulation is performed;

[0018] (3) After spray granulation, dry at 80-100°C for 1 hour, then heat to 500-550°C at a heating rate of 2°C / min under nitrogen protection, keep warm for 1.5-2 hours, heat to 650-700°C at a heating rate of 5°C / min, keep warm for 0.5-1 hour, and finally cool naturally;

[0019] (4) The cooled particles are sieved with a 180 mesh to obtain agglomerated ceramic abrasives.

[0020] Beneficial effects of the present invention:

[0021] The present invention uses ceramic binder, diamond powder, titanium powder, nitrate, nickel sulfate and aluminum zirconate as raw materials to prepare agglomerated ceramic abrasives, which have the advantages of high hardness, uniform particle distribution, good grinding performance, etc. Compared with ordinary ceramic binder diamond agglomerated abrasives, the agglomerated ceramic abrasives of the present invention have the advantages of high hardness, uniform particle distribution, good grinding performance, etc. When the agglomerated ceramic abrasives of the present invention are used to polish marble tiles, no obvious scratches appear on the surface of the tiles, the surface consistency is good, and the polishing efficiency of the marble tiles is high. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] The pseudo-boehmite used in the present invention has the chemical composition (%): SiO2≤0.3%, Fe2O3≤0.03%, Na2O≤0.30, moisture≤20%, ignition loss≤24%, physical and chemical properties, peptization index: ≥95%, trihydrate%≤5%, pore volume≥0.3mL / g, and specific surface area≥250m2 / g.

[0024] Diamond differential uses 180-200 mesh RVD diamond powder as a single particle abrasive for agglomerated abrasives.

[0025] The ceramic binder used in the following examples of the present invention is prepared by the above method.

[0026] Example 1

[0027] A kind of agglomerated ceramic abrasive, the raw materials of the agglomerated ceramic abrasive, according to weight percentage, include 23% ceramic binder, 70% diamond powder, 2% titanium powder, 2.6% nitrate, 0.4% nickel sulfate, 2% aluminum zirconate,

[0028] The ceramic binder is composed of the following raw materials: Na 2 O 9%, silane coupling agent 0.5%, titanate coupling agent 0.5%, Al 2 O 3 12%, B 2 O 3 33%, SiO 2 45%.

[0029] The silane coupling agent is KH-560, and the titanate coupling agent is TMC-401. This embodiment uses TMC-401.

[0030] The preparation method of the ceramic binder is as follows:

[0031] (1) Using pseudo-boehmite as aluminum source and 10% HNO 3 As a peptizing agent, in n(H + Aluminum sol was prepared under the conditions of ) / n(AlOOH)=0.06, temperature=50°C and solid content=10%;

[0032] (2) Using tetraethyl orthosilicate as the silicon source and anhydrous ethanol as the peptizing agent, in the mixture of n(TEOS):n(EtOH):n(H 2 O)∶n(HNO 3 )=1∶3.2∶6.5∶0.087, reaction temperature 60°C, rotation speed 200r / min, time 2h, to obtain silica sol;

[0033] (3) Adding boric acid and sodium nitrate to the aluminum sol in sequence and stirring to mix evenly, then adding the silica sol, continuing to heat, maintaining the temperature at 70°C, rotating at 200 r / min, stirring for 1 hour, allowing the substances in the solution to fully hydrolyze, then adding the silane coupling agent and titanate coupling agent, rotating at 200 r / min, stirring for 30 minutes, and mixing evenly;

[0034] (4) The mixed sol was aged at 110° C. for 24 h and then ball-milled through a 200-mesh sieve to obtain a ceramic binder.

[0035] The method for preparing agglomerated ceramic abrasive comprises the following steps:

[0036] (1) Ceramic binder, diamond powder, titanium powder, molten salt, nickel sulfate and aluminum zirconate were mixed in proportion, and then water was added to make the solid content of the liquid 65%. The mixture was evenly dispersed using a ball mill (ball milling conditions: corundum balls were added in a ratio of 1:1 ball-to-material mass ratio, 30% of the balls were larger than Φ50 mm, and 70% of the balls were smaller than Φ50 mm; the speed was 60 r / min, and the grinding was performed for 1 h) to ensure that the components were evenly distributed;

[0037] (2) spray granulation; the spray pressure is 0.4 MPa, the air inlet temperature is 210°C, the outlet temperature is 110°C, and the spray hole diameter is 0.5 mm;

[0038] (3) After spray granulation, dry at 100°C for 1 h, then heat to 550°C at a heating rate of 2°C / min under nitrogen protection, keep warm for 2 h, heat to 700°C at a heating rate of 5°C / min, keep warm for 0.5 h, and finally cool naturally;

[0039] (4) The cooled particles are sieved with a 180-mesh sieve to obtain agglomerated ceramic abrasives.

[0040] Comparative Examples 1-5 Investigate the Effect of Different Vitrified Binder Compositions on Agglomerated Abrasives

[0041] It is basically the same as Example 1, except that the raw material ratio of the ceramic binder is different, as shown in Table 1.

[0042] The polishing performance and polishing efficiency of the obtained agglomerated abrasive were measured, and the specific method is as follows:

[0043] (1) Accumulated abrasive grinding and polishing performance:

[0044] The agglomerated abrasives prepared in different embodiments were used as abrasives to prepare polishing liquids. The specific composition of the polishing liquids was: 5 parts of agglomerated abrasives, 1 part of oleic acid, 1.5 parts of polyoxypropylene mannitol, 0.5 parts of methyl cellulose, 0.5 parts of fatty alcohol polyoxyethylene ether, and 91.5 parts of water.

[0045] The marble tiles were polished using a polishing test machine, with the speed set at 150r / min and the polishing time set at 5min. The surface morphology of the marble tiles after grinding and polishing was observed; at the same time, the roughness of the polished workpiece surface was tested, and the specific results are shown in Table 1.

[0046] (2) Polishing efficiency of polishing liquid:

[0047] The mass of marble tiles before and after polishing was measured respectively, and the polishing efficiency of the polishing liquid on marble tiles was calculated by the following formula. The specific results are shown in Table 1:

[0048] Polishing efficiency = (m1-m2) / m1*h.

[0049] In the formula: m1, m2 are the mass of glass before and after processing, respectively, in g; h is the grinding time, in min.

[0050] Table 1 Experimental results of the effects of different vitrified binder compositions on agglomerated abrasives

[0051]

[0052] As shown in Table 1, the agglomerated ceramic abrasive prepared in Example 1 has no obvious scratches on the surface of the marble tile after polishing the marble tile, and the surface consistency is good, and its roughness is Ra0.786μm, and the polishing efficiency of the marble tile is 0.95g / min. The agglomerated ceramic abrasive prepared in Comparative Examples 1-3 has more scratches on the surface of the marble tile, the surface consistency is poor, and its roughness is Ra1.079-1.125μm, and the polishing efficiency of the marble tile is 0.68-0.71g / min. It can be seen that the ceramic binder of the agglomerated ceramic abrasive of the present invention is added with silane coupling agent and titanate coupling agent, which can significantly improve the performance of the diamond agglomerated abrasive containing titanium powder. Compared with Comparative Example 1 without adding silane coupling agent and titanate coupling agent, the roughness is reduced by 30%, the polishing efficiency is increased by 34%, and the improvement effect is obvious. The present invention adds silane coupling agent and titanate coupling agent to the ceramic binder. The silane coupling agent mainly strengthens the interface bonding through chemical bonding with the inorganic phase and the organic phase, while the titanate coupling agent further strengthens the bonding effect through interfacial activation and improved dispersibility. The two are complementary in mechanism of action and can more comprehensively improve the performance of the binder. The silanol group of the silane coupling agent and the titanium element of the titanate coupling agent can form a more complex chemical bond network with the inorganic phase in the ceramic binder, thereby significantly improving the mechanical strength and holding force of the binder. The combined action of the two coupling agents can optimize the interface structure between the ceramic binder and the diamond agglomerated abrasive, reduce interface defects, and improve the uniformity and stability of the binder. Such a ceramic binder coats the diamond particles well to form a uniform holding force, and the sol-gel binder particle size is fine, which can make the stability of the agglomerated ceramic abrasive in the polishing process, and can effectively reduce the surface roughness of the workpiece being ground.

[0053] Comparative Examples 6-9 Investigate the Effect of Different Raw Material Compositions on Agglomerated Abrasives

[0054] It is basically the same as Example 1, except that the raw material ratio of the agglomerated abrasive is different, as shown in Table 2.

[0055] The polishing performance and polishing efficiency of the obtained agglomerated abrasive were measured, as shown in Table 2.

[0056] Table 2 Experimental results of the effect of different raw material compositions on agglomerated abrasives

[0057]

[0058] As shown in Table 2, after polishing the marble tile, the agglomerated ceramic abrasive prepared in Example 1 has no obvious scratches on the surface of the tile, the surface consistency is good, and its roughness is Ra0.812μm, and the polishing efficiency of the marble tile is 0.97g / min. The agglomerated ceramic abrasive prepared in Comparative Examples 6-93 has many scratches on the surface of the marble tile, the surface consistency is poor, and its roughness is Ra0.964-1.243μm, and the polishing efficiency of the marble tile is 0.71-0.85g / min. It can be seen that the performance of the agglomerated ceramic abrasive prepared in the present invention is significantly better than that of Comparative Examples 6-9.

[0059] The present invention uses a ceramic binder and diamond composite agglomerated abrasive, adds titanium powder, nitrate, nickel sulfate and aluminum zirconate, interacts through different mechanisms, thereby improving the holding force of diamond particles and improving the surface roughness of the abrasive, titanium powder reacts with the diamond surface during high-temperature sintering to generate titanium carbide, forms a strong chemical bond, significantly improves the interface bonding force between the ceramic binder and the diamond particles, thereby enhancing the holding force, and titanium powder improves the toughness of the ceramic binder through a dispersion strengthening mechanism, reducing the fragmentation and shedding of the abrasive during use. Nitrate decomposes at high temperature, releases oxygen and nitrogen, promotes the redox reaction during the sintering process, forms a uniform microstructure, improves the compactness and strength of the binder, and the gas generated by the decomposition of nitrate helps to reduce surface defects during the sintering process, thereby improving the surface roughness of the abrasive. Nickel sulfate, as a sintering aid, can reduce the sintering temperature of the ceramic binder, promote the densification of the binder, and improve its strength and hardness. Nickel sulfate reacts with titanium powder to generate compounds such as nickel-titanium alloy, further enhancing the interface bonding force between the binder and the diamond particles. Aluminum zirconate is a high melting point ceramic material that can significantly improve the thermal stability and mechanical properties of the binder, ensuring the stability of the abrasive under high temperature and high pressure conditions. At the same time, the addition of aluminum zirconate can refine the grains of the ceramic binder and reduce surface roughness, thereby improving the surface quality of the abrasive.

[0060] Titanium powder and nickel sulfate synergistically enhance the interface bonding: Titanium powder and nickel sulfate react during the sintering process to form compounds such as nickel-titanium alloy, further enhancing the interface bonding between the binder and diamond particles. The gas produced by the decomposition of nitrates and the sintering aid of nickel sulfate work synergistically to promote the uniform densification of the binder and improve the surface roughness. The thermal stability and mechanical properties of aluminum zirconate combined with the interface strengthening effect of titanium powder and nickel sulfate significantly improve the overall performance of the abrasive.

[0061] Titanium powder, nitrate, nickel sulfate and aluminum zirconate, through their respective characteristics and synergistic effects, make the abrasive have higher diamond particle holding force and lower surface roughness, thereby improving the overall performance and service life of the abrasive.

[0062] Example 2

[0063] A kind of agglomerated ceramic abrasive, the raw materials of the agglomerated ceramic abrasive, according to weight percentage, include 25% ceramic binder, 65% diamond powder, 3% titanium powder, 5% nitrate, 0.5% nickel sulfate, 1.5% aluminum zirconate,

[0064] The ceramic binder is composed of the following raw materials: Na 2 O 9%, silane coupling agent 0.5%, titanate coupling agent 0.5%, Al 2 O 3 12%, B 2 O 3 33%, SiO 2 45%.

[0065] The silane coupling agent is KH-550, and the titanate coupling agent is TMC-301.

[0066] The preparation method is as follows:

[0067] (1) Using pseudo-boehmite as aluminum source and 10% HNO 3 As a peptizing agent, in n(H + Aluminum sol was prepared under the conditions of ) / n(AlOOH)=0.06, temperature=50°C and solid content=10%;

[0068] (2) Using tetraethyl orthosilicate as the silicon source and anhydrous ethanol as the peptizing agent, in the mixture of n(TEOS):n(EtOH):n(H2O):n(HNO 3 )=1∶3.2∶6.5∶0.087, reaction temperature 60°C, rotation speed 200r / min, reaction time 2h, to prepare silica sol;

[0069] (3) Adding boric acid and sodium nitrate to the aluminum sol in sequence and stirring to mix evenly, then adding the silica sol, continuing to heat, maintaining the temperature at 70°C, rotating at 200 r / min, stirring for 1 hour, allowing the substances in the solution to fully hydrolyze, then adding the silane coupling agent and titanate coupling agent, rotating at 200 r / min, stirring for 30 minutes, and mixing evenly;

[0070] (4) The mixed sol was aged at 100°C for 36 h and then ball-milled through a 200-mesh sieve to obtain a ceramic binder.

[0071] The preparation method thereof comprises the following steps:

[0072] (1) mixing ceramic binder, diamond powder, titanium powder, molten salt, nickel sulfate and aluminum zirconate in proportion, then adding water so that the solid content of the liquid is 65%, and using a ball mill to evenly disperse the mixture to ensure that the components are evenly distributed;

[0073] (2) spray granulation; the spray pressure is 0.5 MPa, the air inlet temperature is 220°C, the outlet temperature is 110°C, and the spray hole diameter is 0.5 mm;

[0074] (3) After spray granulation, the mixture was dried at 100°C for 1 h, then heated to 550°C at a heating rate of 2°C / min under nitrogen protection, kept at this temperature for 2 h, then heated to 650°C at a heating rate of 5°C / min, kept at this temperature for 0.5 h, and finally cooled naturally;

[0075] (4) The cooled particles are sieved with a 180-mesh sieve to obtain agglomerated ceramic abrasives.

[0076] After polishing marble tiles with the prepared agglomerated ceramic abrasive, no obvious scratches appeared on the tile surface, the surface consistency was good, and its roughness was Ra0.678μm. After calculation, the polishing efficiency of marble tiles was 1.08g / min.

[0077] Example 3

[0078] A kind of agglomerated ceramic abrasive, the raw materials of the agglomerated ceramic abrasive, according to weight percentage, include 25% ceramic binder, 65% diamond powder, 3% titanium powder, 3.7% nitrate, 0.3% nickel sulfate, 3% aluminum zirconate,

[0079] The ceramic binder is composed of the following raw materials: Na 2 O 9%, silane coupling agent 0.5%, titanate coupling agent 0.5%, Al 2 O 3 12%, B 2 O 3 33%, SiO 2 45%.

[0080] The silane coupling agent is KH-550 or KH-560, and this embodiment uses KH-560. The titanate coupling agent is TMC-301 or TMC-401, and this embodiment uses TMC-401.

[0081] The preparation method is as follows:

[0082] (1) Using pseudo-boehmite as aluminum source and 10% HNO 3 As a peptizing agent, in n(H +Aluminum sol was prepared under the conditions of ) / n(AlOOH)=0.06, temperature=50°C and solid content=10%;

[0083] (2) Using tetraethyl orthosilicate as the silicon source and anhydrous ethanol as the peptizing agent, in the mixture of n(TEOS):n(EtOH):n(H 2 O)∶n(HNO 3 )=1∶3.2∶6.5∶0.087, reaction temperature 60°C, rotation speed 200r / min, reaction time 2h, to prepare silica sol;

[0084] (3) Adding boric acid and sodium nitrate to the aluminum sol in sequence and stirring to mix evenly, then adding the silica sol, continuing to heat, maintaining the temperature at 70°C, rotating at 200 r / min, stirring for 1 hour, allowing the substances in the solution to fully hydrolyze, then adding the silane coupling agent and titanate coupling agent, rotating at 200 r / min, stirring for 30 minutes, and mixing evenly;

[0085] (4) The mixed sol was aged at 120° C. for 24 h and then ball-milled through a 200-mesh sieve to obtain a ceramic binder.

[0086] The preparation method thereof comprises the following steps:

[0087] (1) mixing ceramic binder, diamond powder, titanium powder, molten salt, nickel sulfate and aluminum zirconate in proportion, then adding water so that the solid content of the liquid is 65%, and using a ball mill to evenly disperse the mixture to ensure that the components are evenly distributed;

[0088] (2) spray granulation; the spray pressure is 0.6 MPa, the air inlet temperature is 200°C, the outlet temperature is 100°C, and the spray hole diameter is 0.4 mm;

[0089] (3) After spray granulation, the mixture was dried at 100 °C for 1 h, then heated to 500 °C at a heating rate of 2 °C / min under nitrogen protection, kept at this temperature for 2 h, then heated to 700 °C at a heating rate of 5 °C / min, kept at this temperature for 0.5 h, and finally cooled naturally;

[0090] (4) The cooled particles are sieved with a 180-mesh sieve to obtain agglomerated ceramic abrasives.

[0091] After polishing marble tiles with the prepared agglomerated ceramic abrasive, no obvious scratches appeared on the tile surface, the surface consistency was good, and its roughness was Ra0.906μm. The polishing efficiency of marble tiles was 0.95g / min.

[0092] Example 4

[0093] A kind of agglomerated ceramic abrasive, the raw materials of the agglomerated ceramic abrasive, according to weight percentage, include 30% ceramic binder, 65% diamond powder, 1% titanium powder, 2.5% nitrate, 0.5% nickel sulfate, 1% aluminum zirconate,

[0094] The ceramic binder is composed of the following raw materials: Na 2 O 9%, silane coupling agent 0.5%, titanate coupling agent 0.5%, Al 2 O 3 12%, B 2 O 3 33%, SiO 2 45%.

[0095] The silane coupling agent is KH-550 or KH-560, and this embodiment uses KH-560. The titanate coupling agent is TMC-301 or TMC-401, and this embodiment uses TMC-401.

[0096] The preparation method is as follows:

[0097] (1) Using pseudo-boehmite as aluminum source and 10% HNO 3 As a peptizing agent, in n(H + Aluminum sol was prepared under the conditions of ) / n(AlOOH)=0.06, temperature=50°C and solid content=10%;

[0098] (2) Using tetraethyl orthosilicate as the silicon source and anhydrous ethanol as the peptizing agent, in the mixture of n(TEOS):n(EtOH):n(H 2 O)∶n(HNO 3 )=1∶3.2∶6.5∶0.087, reaction temperature 60°C, rotation speed 200r / min, reaction time 2h, to prepare silica sol;

[0099] (3) Adding boric acid and sodium nitrate to the aluminum sol in sequence and stirring to mix evenly, then adding the silica sol, continuing to heat, maintaining the temperature at 70°C, rotating at 200 r / min, stirring for 1 hour, allowing the substances in the solution to fully hydrolyze, then adding the silane coupling agent and titanate coupling agent, rotating at 200 r / min, stirring for 30 minutes, and mixing evenly;

[0100] (4) The mixed sol was aged at 110° C. for 24 h and then ball-milled through a 200-mesh sieve to obtain a ceramic binder.

[0101] The preparation method thereof comprises the following steps:

[0102] (1) mixing ceramic binder, diamond powder, titanium powder, molten salt, nickel sulfate and aluminum zirconate in proportion, then adding water so that the solid content of the liquid is 70%, and uniformly dispersing the mixture using a ball mill to ensure uniform distribution of each component;

[0103] (2) spray granulation; the spray pressure is 0.4 MPa, the air inlet temperature is 210°C, the outlet temperature is 110°C, and the spray hole diameter is 0.5 mm;

[0104] (3) After spray granulation, the mixture was dried at 100 °C for 1 h, then heated to 550 °C at a heating rate of 2 °C / min under nitrogen protection, kept at this temperature for 2 h, then heated to 650 °C at a heating rate of 5 °C / min, kept at this temperature for 0.5 h, and finally cooled naturally;

[0105] (4) The cooled particles are sieved with a 180-mesh sieve to obtain agglomerated ceramic abrasives.

[0106] After polishing marble tiles with the prepared agglomerated ceramic abrasive, no obvious scratches appeared on the tile surface, the surface consistency was good, and its roughness was Ra0.785μm. The polishing efficiency of marble tiles was 0.93g / min.

[0107] Example 5

[0108] A kind of agglomerated ceramic abrasive, the raw materials of the agglomerated ceramic abrasive, according to weight percentage, include 26% ceramic binder, 66% diamond powder, 2% titanium powder, 3.2% nitrate, 0.3% nickel sulfate, 2.5% aluminum zirconate,

[0109] The ceramic binder is composed of the following raw materials: Na 2 O 9%, silane coupling agent 0.5%, titanate coupling agent 0.5%, Al 2 O 3 12%, B 2 O 3 33%, SiO 2 45%.

[0110] The silane coupling agent is KH-550 or KH-560, and this embodiment uses KH-560. The titanate coupling agent is TMC-301 or TMC-401, and this embodiment uses TMC-401.

[0111] The preparation method is as follows:

[0112] (1) Using pseudo-boehmite as aluminum source and 10% HNO 3 As a peptizing agent, in n(H + Aluminum sol was prepared under the conditions of ) / n(AlOOH)=0.06, temperature=50°C and solid content=10%;

[0113] (2) Using tetraethyl orthosilicate as the silicon source and anhydrous ethanol as the peptizing agent, in the mixture of n(TEOS):n(EtOH):n(H 2 O)∶n(HNO 3 )=1∶3.2∶6.5∶0.087, reaction temperature 60°C, rotation speed 200r / min, reaction time 2h, to prepare silica sol;

[0114] (3) Adding boric acid and sodium nitrate to the aluminum sol in sequence and stirring to mix evenly, then adding the silica sol, continuing to heat, maintaining the temperature at 70°C, rotating at 200 r / min, stirring for 1 hour, allowing the substances in the solution to fully hydrolyze, then adding the silane coupling agent and titanate coupling agent, rotating at 200 r / min, stirring for 30 minutes, and mixing evenly;

[0115] (4) The mixed sol was aged at 100°C for 36 h and then ball-milled through a 200-mesh sieve to obtain a ceramic binder.

[0116] The preparation method thereof comprises the following steps:

[0117] (1) mixing ceramic binder, diamond powder, titanium powder, molten salt, nickel sulfate and aluminum zirconate in proportion, then adding water so that the solid content of the liquid is 65-70%, and using a ball mill to evenly disperse the mixture to ensure that the components are evenly distributed;

[0118] (2) spray granulation; the spray pressure is 0.4 MPa, the air inlet temperature is 210°C, the outlet temperature is 110°C, and the spray hole diameter is 0.5 mm;

[0119] (3) After spray granulation, the mixture was dried at 100°C for 1 h, and then heated to 550°C at a heating rate of 2°C / min under nitrogen protection, kept at this temperature for 1.5 h, and then heated to 650°C at a heating rate of 5°C / min, kept at this temperature for 0.5 h, and finally cooled naturally;

[0120] (4) The cooled particles are sieved with a 180-mesh sieve to obtain agglomerated ceramic abrasives.

[0121] After polishing marble tiles with the prepared agglomerated ceramic abrasive, no obvious scratches appeared on the tile surface, the surface consistency was good, and its roughness was Ra0.801μm. The polishing efficiency of marble tiles was 0.93g / min.

[0122] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An agglomerated ceramic abrasive, characterized in that: The raw materials of the agglomerated ceramic abrasive include, by weight percentage, 25-30% ceramic binder, 65-70% diamond powder, 1-3% titanium powder, 2.5-5% nitrate, 0.3-0.5% nickel sulfate and 1-3% aluminum zirconate.

2. The agglomerated ceramic abrasive according to claim 1, characterized in that: The raw materials of the agglomerated ceramic abrasive include, by weight percentage, 25% ceramic binder, 65% diamond powder, 3% titanium powder, 5% nitrate, 0.5% nickel sulfate and 1.5% aluminum zirconate.

3. The agglomerated ceramic abrasive according to claim 1, characterized in that: The ceramic binder is composed of the following raw materials: 9% Na2O, 0.5% silane coupling agent, 0.5% titanate coupling agent, 12% Al2O3, 33% B2O3 and 45% SiO2.

4. The agglomerated ceramic abrasive according to claim 3, characterized in that: The silane coupling agent is KH-550 or KH-560.

5. The agglomerated ceramic abrasive according to claim 3, characterized in that: The titanate coupling agent is TMC-301 or TMC-401.

6. The method for preparing agglomerated ceramic abrasive according to claim 3, characterized in that: The preparation method of the ceramic binder is as follows: (1) Using pseudo-boehmite as aluminum source and 10% HNO3 as peptizing agent, in n(H + Aluminum sol was prepared under the conditions of ) / n(AlOOH)=0.06, temperature=50°C and solid content=10%; (2) using tetraethyl orthosilicate as a silicon source and anhydrous ethanol as a peptizing agent, preparing silica sol under the conditions of n(TEOS):n(EtOH):n(H2O):n(HNO3)=1:3.2:6.5:0.087, reaction temperature 60°C, rotation speed 200r / min, reaction time 2h; (3) Adding boric acid and sodium nitrate to the aluminum sol in sequence and stirring to mix evenly, then adding the silica sol, continuing to heat, maintaining the temperature at 70°C, rotating at 200 r / min, stirring for 1 hour, allowing the substances in the solution to fully hydrolyze, then adding the silane coupling agent and titanate coupling agent, rotating at 200 r / min, stirring for 30 minutes, and mixing evenly; (4) The mixed sol is aged at 100-120° C. for 24-36 h, and then ball-milled through a 200-mesh sieve to obtain a ceramic binder.

7. A method for preparing the agglomerated ceramic abrasive according to any one of claims 1 to 6, characterized in that: The following steps are involved: (1) mixing ceramic binder, diamond powder, titanium powder, molten salt, nickel sulfate and aluminum zirconate in proportion, then adding water so that the solid content of the liquid is 65-70%, and using a ball mill or ultrasonic dispersing equipment to evenly disperse the mixture to ensure that each component is evenly distributed; (2) spray granulation; the spray pressure is 0.4-0.6MPa, the air inlet temperature is 200-220°C, the outlet temperature is 100-110°C, the spray hole diameter is 0.4-0.5mm, and the spray granulation is performed; (3) After spray granulation, dry at 80-100°C for 1 hour, then heat to 500-550°C at a heating rate of 2°C / min under nitrogen protection, keep warm for 1.5-2 hours, heat to 650-700°C at a heating rate of 5°C / min, keep warm for 0.5-1 hour, and finally cool naturally; (4) The cooled particles are sieved with a 180-mesh screen to remove large particles, thereby obtaining agglomerated ceramic abrasives.

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