Metal ceramic granulating cutter and preparation process thereof

Abstract

The application discloses a kind of preparation raw materials of cermet granulating cutter, including TiC, NiCr, sintering auxiliary agent and binder, the binder includes phenolic resin and the modified polypropylene carbonate that group is grafted on polypropylene carbonate tertiary carbon;The beneficial effects of the application are that: the cermet granulating cutter prepared by the application has smooth product surface, high hardness, good corrosion resistance, long service life, and good strength and toughness, and the whole process flow is smooth from mixing to sintering in the production process, and the product qualified rate.

Description

Technical Field

[0001] This invention relates to the field of granulation cutter preparation, and more particularly to a metal-ceramic granulation cutter and its preparation process. Background Technology

[0002] As the core moving component of an underwater pelletizing system, the pelletizer blade, together with the pelletizing template (fixed blade), forms a shearing unit. Its performance directly determines the molding accuracy, production efficiency, and equipment operational stability of the plastic pellets. Currently, pelletizer blades include test-run blades, iron-based cermet composite pelletizer blades, nickel-based cermet composite pelletizer blades, and special melt index blades. Among them, the nickel-based cermet composite pelletizer blade uses conductors and cutting edges separately, and employs vacuum diffusion welding or vacuum brazing composite methods. Its interface bonding strength is ≥340MPa, with the hard phase TiC uniformly dispersed in the NiCr solid solution. The interface bonding is free of pores and cracks, and its wear resistance, corrosion resistance, and high temperature resistance far exceed those of the iron-based system. The single-blade life is ≥720 hours, and the cutting edge stability is superior.

[0003] However, the production of nickel-based metal ceramic composite pelletizers is quite difficult. The adhesive removal process is crucial for bonding, molding, and sintering. Poor control of the adhesive removal process can easily lead to product quality problems, such as defects in the green body and uneven compaction density. Some adhesives decompose too quickly during removal and sintering, causing uneven shrinkage, deformation, or cracking of the product. If the adhesive removal is incomplete, it will remain in the material, potentially forming free carbon or excessive carbides, contaminating the TiC-NiCr solid solution, and reducing the purity and high-temperature performance of the material.

[0004] To address the shortcomings of existing technologies, this invention provides a metal-ceramic granulation cutter. Summary of the Invention

[0005] The raw materials for preparing a metal-ceramic granulation cutter include TiC, NiCr, sintering aids, and binders. The binders include phenolic resin and groups grafted onto tert-carbon polypropylene carbonate. Modified polypropylene carbonate.

[0006] In one possible implementation, the mass ratio of phenolic resin to modified polypropylene carbonate is (1-5):(10-30).

[0007] In one possible implementation, the sintering aid is aluminum powder, boron powder, or silicon powder.

[0008] In one possible implementation, the raw materials for preparing modified polypropylene carbonate include polypropylene carbonate and bromophenylacetone.

[0009] In one possible implementation, the preparation steps of modified polypropylene carbonate include:

[0010] 1) Dissolve polypropylene carbonate in a solvent to prepare a polypropylene carbonate solution, then add the polypropylene carbonate solution into a reaction vessel and stir;

[0011] 2) NBS and CCl4 were added to the polypropylene carbonate solution, and the reaction was carried out under the first process conditions to obtain the first intermediate product.

[0012] 3) Dissolve bromophenylacetone and the first intermediate product in a solvent to prepare bromophenylacetone solution and the first intermediate product solution, respectively;

[0013] 4) Add metallic sodium to the reactor under the protection of an inert gas, and then add solvent to the reactor and stir at reflux temperature;

[0014] 5) The bromophenylacetone solution was added to a reaction vessel containing metallic sodium, and then the first intermediate product solution was added to the reaction vessel. After the reaction was completed and purified, modified polypropylene carbonate was obtained.

[0015] In one possible implementation, the first process conditions in step 1) are a temperature of 70-85°C and a reaction time of 1-5 hours.

[0016] The preparation process of a metal-ceramic granulation cutter includes the following steps:

[0017] 1) Dissolve polypropylene carbonate in a solvent to prepare a polypropylene carbonate solution, then add the polypropylene carbonate solution into the reaction vessel and stir;

[0018] 2) NBS and CCl4 were added to the polypropylene carbonate solution, and the reaction was carried out under the first process conditions to obtain the first intermediate product.

[0019] 3) Dissolve bromophenylacetone and the first intermediate product in a solvent to prepare bromophenylacetone solution and the first intermediate product solution, respectively;

[0020] 4) Add metallic sodium to the reactor under the protection of an inert gas, and then add solvent to the reactor and stir under the second process.

[0021] 5) The bromophenylacetone solution was added to a reaction vessel containing metallic sodium, and then the first intermediate product solution was added to the reaction vessel. After the reaction was completed and purified, the modified polypropylene carbonate was obtained.

[0022] 6) Prepare a phenolic resin solution and a modified polypropylene carbonate solution, and mix them in a certain proportion to form an adhesive;

[0023] 7) Mix TiC powder and NiCr alloy powder in a certain proportion, add an appropriate amount of sintering aid, and mix evenly using a planetary ball mill to obtain a premix.

[0024] 8) Feed the premixed material into the granulator, add the binder, and granulate using a rolling granulation method;

[0025] 9) Press the prepared particles into shape on a press to obtain a cutting board;

[0026] 10) The blade is debonded in a vacuum furnace using a segmented debonding process to obtain a TiC-NiCr solid solution structure metal ceramic granulated blade semi-finished product;

[0027] 11) The semi-finished metal-ceramic granulation cutting blade is finely ground with a diamond grinding wheel to obtain the metal-ceramic granulation cutting blade.

[0028] In one possible implementation, the manufacturing process also includes welding the blade body and the metal-ceramic granulation cutting edge to prepare a metal-ceramic granulation cutting tool.

[0029] In one possible implementation, the TiC powder has a particle size of 5-10 μm, and the mass ratio of Ni to Cr in the NiCr alloy powder is (5-7):(1-3).

[0030] In one possible implementation, the debonding process is carried out in stages, first holding at 200-600℃ for 2 hours, then sintering at 1250-1350℃ for 3 hours, with the vacuum degree inside the furnace ≤1×10-3Pa.

[0031] The beneficial effects of this invention are as follows: The metal ceramic granulation cutter prepared by this invention has a smooth surface, high hardness, good corrosion resistance, long service life, and good toughness. In the production process, from mixing to sintering, the entire process is smooth and the product qualification rate is high. Detailed Implementation

[0032] To clearly illustrate the technical features of this solution, the following detailed implementation method will be used to describe the solution.

[0033] Example 1:

[0034] Preparation of adhesive:

[0035] 1) Dissolve polypropylene carbonate in acetone to prepare a polypropylene carbonate solution, then add the polypropylene carbonate solution to the reaction vessel and stir.

[0036] 2) Add NBS and CCl4 to the polypropylene carbonate solution and react at a reflux temperature of 70°C for 1 hour. After the reaction is complete, purify to obtain the first intermediate product.

[0037] 3) Dissolve bromophenylacetone and the first intermediate product in diethyl ether to prepare bromophenylacetone solution and the first intermediate product solution, respectively.

[0038] 4) Add metallic sodium to the reactor under the protection of inert nitrogen gas, and then add diethyl ether solvent to the reactor and stir at a reflux temperature of 45°C.

[0039] 5) The bromophenylacetone solution was slowly added dropwise to the reaction vessel containing metallic sodium, and then the first intermediate product solution was slowly added dropwise to the reaction vessel. After the reaction was completed and purified, modified polypropylene carbonate was obtained.

[0040] 6) Dissolve phenolic resin in acetone to prepare a phenolic resin solution with a mass fraction of 20%, dissolve modified polypropylene carbonate in acetone to prepare a polypropylene carbonate solution with a mass fraction of 20%, and then mix the phenolic resin solution and the modified polypropylene carbonate solution at a mass ratio of 1:10 to prepare an adhesive.

[0041] Preparation of granulated metal-ceramic cutting blades:

[0042] 1) Mix 60 parts of TiC powder and 20 parts of NiCr alloy powder (Ni and Cr mass ratio is 5:1), add 0.5% of the total weight of TiC powder and NiCr alloy powder as an appropriate amount of sintering aid aluminum powder, and mix using a planetary ball mill for 4 hours. The mixing uniformity is ≥95% to obtain a premix.

[0043] 2) Feed the premix into the granulator and add 5% of the total weight of the premix as binder. Then granulate by rolling granulation to achieve a particle size of 0.1 mm.

[0044] 3) The prepared particles are pressed into shape on a 60-ton press at a molding pressure of 200MPa to obtain the knife handle.

[0045] 4) The molded parts are debonded using a segmented debonding process in a vacuum furnace. First, the furnace is heated to 200℃ for 2 hours, then sintered at 1250℃ for 3 hours. The vacuum degree inside the furnace is ≤1×10⁻⁶. -3 Pa, finally yielded a TiC-NiCr solid solution structure metal ceramic granulated blade semi-finished product;

[0046] 5) The semi-finished metal-ceramic granulation blade is finely ground with a diamond grinding wheel, with a cutting edge runout ≤0.01mm and a surface roughness Ra≤0.2μm, to obtain the metal-ceramic granulation cutting blade.

[0047] 6) The 40Cr material blade and the metal ceramic granulation cutting blade are welded under the process conditions of welding temperature of 1050℃, holding time of 1.5 hours and welding pressure of 5MPa to prepare the metal ceramic granulation cutting blade.

[0048] Example 2:

[0049] Preparation of adhesive:

[0050] 1) Dissolve polypropylene carbonate in dichloromethane to prepare a polypropylene carbonate solution, and then add the polypropylene carbonate solution into a reaction vessel and stir.

[0051] 2) Add NBS and CCl4 to the polypropylene carbonate solution and react at a reflux temperature of 85°C for 5 hours. After the reaction is complete, purify to obtain the first intermediate product.

[0052] 3) Dissolve bromophenylacetone and the first intermediate product in tetrahydrofuran to prepare bromophenylacetone solution and the first intermediate product solution, respectively.

[0053] 4) Add metallic sodium to the reactor under the protection of inert helium gas, and then add tetrahydrofuran solvent to the reactor and stir at a reflux temperature of 75°C.

[0054] 5) The bromophenylacetone solution was slowly added dropwise to the reaction vessel containing metallic sodium, and then the first intermediate product solution was slowly added dropwise to the reaction vessel. After the reaction was completed and purified, modified polypropylene carbonate was obtained.

[0055] 6) Phenolic resin is dissolved in dichloromethane to prepare a phenolic resin solution with a mass fraction of 40%. Modified polypropylene carbonate is dissolved in dichloromethane to prepare a polypropylene carbonate solution with a mass fraction of 40%. The phenolic resin solution and the modified polypropylene carbonate solution are then mixed in a mass ratio of 5:30 to prepare an adhesive.

[0056] Preparation of granulated metal-ceramic cutting blades:

[0057] 1) Mix 80 parts of TiC powder and 40 parts of NiCr alloy powder (Ni and Cr mass ratio is 7:3), add an appropriate amount of sintering aid boron powder at 1% of the total weight of TiC powder and NiCr alloy, and mix using a planetary ball mill for 6 hours. The mixing uniformity is ≥95% to obtain a premix.

[0058] 2) Feed the premix into the granulator and add 8% of the total weight of the premix as binder. Then granulate by rolling granulation to achieve a particle size of 0.3 mm.

[0059] 3) The prepared particles are pressed into shape on a 60-ton press under a molding pressure of 250MPa to obtain the knife handle.

[0060] 4) The molded parts are debonded using a segmented debonding process in a vacuum furnace. First, the furnace is heated to 600℃ for 2 hours, then sintered at 1350℃ for 3 hours. The vacuum level inside the furnace is ≤1×10⁻⁶. -3 Pa, finally yielded a TiC-NiCr solid solution structure metal ceramic granulated blade semi-finished product;

[0061] 5) The semi-finished metal-ceramic granulation blade is finely ground with a diamond grinding wheel, with a cutting edge runout ≤0.01mm and a surface roughness Ra≤0.2μm, to obtain the metal-ceramic granulation cutting blade.

[0062] 6) The 40Cr material blade body and the metal ceramic granulation cutting blade are welded under the process conditions of welding temperature of 1100℃, holding time of 2 hours and welding pressure of 8MPa to prepare the metal ceramic granulation cutting blade.

[0063] Example 3:

[0064] Preparation of adhesive:

[0065] 1) Dissolve polypropylene carbonate in chloroform to prepare a polypropylene carbonate solution, then add the polypropylene carbonate solution to the reaction vessel and stir.

[0066] 2) Add NBS and CCl4 to the polypropylene carbonate solution and react at a reflux temperature of 80°C for 1-5 hours. After the reaction is complete, purify to obtain the first intermediate product.

[0067] 3) Dissolve bromophenylacetone and the first intermediate product in diethyl ether to prepare bromophenylacetone solution and the first intermediate product solution, respectively.

[0068] 4) Add metallic sodium to the reactor under the protection of inert helium gas, and then add diethyl ether as solvent to the reactor and stir at a reflux temperature of 45°C.

[0069] 5) The bromophenylacetone solution was slowly added dropwise to the reaction vessel containing metallic sodium, and then the first intermediate product solution was slowly added dropwise to the reaction vessel. After the reaction was completed and purified, modified polypropylene carbonate was obtained.

[0070] 6) Dissolve phenolic resin in chloroform to prepare a phenolic resin solution with a mass fraction of 30%. Dissolve modified polypropylene carbonate in chloroform to prepare a polypropylene carbonate solution with a mass fraction of 30%. Then mix the phenolic resin solution and the modified polypropylene carbonate solution with a mass ratio of 3:20 to prepare an adhesive.

[0071] Preparation of granulated metal-ceramic cutting blades:

[0072] 1) Mix 70) parts of TiC powder and 30) parts of NiCr alloy powder (Ni and Cr mass ratio is 3:1), add an appropriate amount of sintering aid silicon powder of 0.8% of the total weight of TiC powder and NiCr alloy, and mix with a planetary ball mill for 5 hours. The mixing uniformity is ≥95% to obtain a premix.

[0073] 2) Feed the premix into the granulator and add 6% of the total weight of the premix as binder. Then granulate by rolling granulation to achieve a particle size of 0.2 mm.

[0074] 3) The prepared particles are pressed into shape on a 60-ton press under a molding pressure of 230MPa to obtain the knife handle.

[0075] 4) The molded parts are debonded using a segmented debonding process in a vacuum furnace. First, the furnace is held at 400℃ for 2 hours, then sintered at 1300℃ for 3 hours. The vacuum level inside the furnace is ≤1×10⁻⁶. -3 Pa, finally yielded a TiC-NiCr solid solution structure metal ceramic granulated blade semi-finished product;

[0076] 5) The semi-finished metal-ceramic granulation blade is finely ground with a diamond grinding wheel, with a cutting edge runout ≤0.01mm and a surface roughness Ra≤0.2μm, to obtain the metal-ceramic granulation cutting blade.

[0077] 6) The 40Cr material blade and the metal ceramic granulation cutting blade are welded under the process conditions of welding temperature of 108℃, holding time of 1.8 hours and welding pressure of 7MPa to prepare the metal ceramic granulation cutting blade.

[0078] Comparative Example 1:

[0079] Preparation of adhesive:

[0080] 1) Dissolve phenolic resin in chloroform to prepare a phenolic resin solution with a mass fraction of 30% as an adhesive.

[0081] Preparation of granulated metal-ceramic cutting blades:

[0082] 1) Mix 70 parts of TiC powder and 30 parts of NiCr alloy powder (Ni and Cr mass ratio is 3:1), add an appropriate amount of sintering aid silicon powder of 0.8% of the total weight of TiC powder and NiCr alloy, and mix using a planetary ball mill for 5 hours. The mixing uniformity is ≥95% to obtain a premix.

[0083] 2) Feed the premix into the granulator and add 6% of the total weight of the premix as binder. Then granulate by rolling granulation to achieve a particle size of 0.2 mm.

[0084] 3) The prepared particles are pressed into shape on a 60-ton press under a molding pressure of 230MPa to obtain the knife handle.

[0085] 4) The molded parts are debonded using a segmented debonding process in a vacuum furnace. First, the furnace is held at 400℃ for 2 hours, then sintered at 1300℃ for 3 hours. The vacuum level inside the furnace is ≤1×10⁻⁶. -3 Pa, finally yielded a TiC-NiCr solid solution structure metal ceramic granulated blade semi-finished product;

[0086] 5) The semi-finished metal-ceramic granulation blade is finely ground with a diamond grinding wheel, with a cutting edge runout ≤0.01mm and a surface roughness Ra≤0.2μm, to obtain the metal-ceramic granulation cutting blade.

[0087] 6) The 40Cr material blade and the metal ceramic granulation cutting blade are welded under the process conditions of welding temperature of 108℃, holding time of 1.8 hours and welding pressure of 7MPa to prepare the metal ceramic granulation cutting blade.

[0088] Comparative Example 2:

[0089] Preparation of adhesive:

[0090] 1) Dissolve polypropylene carbonate in chloroform to prepare a polypropylene carbonate solution, then add the polypropylene carbonate solution to the reaction vessel and stir.

[0091] 2) Add NBS and CCl4 to the polypropylene carbonate solution and react at a reflux temperature of 80℃ for 1-5 hours. After purification, the modified polypropylene carbonate is obtained.

[0092] 6) Dissolve phenolic resin in chloroform to prepare a phenolic resin solution with a mass fraction of 30%. Dissolve modified polypropylene carbonate in chloroform to prepare a polypropylene carbonate solution with a mass fraction of 30%. Then mix the phenolic resin solution and the modified polypropylene carbonate solution with a mass ratio of 3:20 to prepare an adhesive.

[0093] Preparation of granulated metal-ceramic cutting blades:

[0094] 1) Mix 70 parts of TiC powder and 30 parts of NiCr alloy powder (Ni and Cr in a mass ratio of 3:1), add an appropriate amount of sintering aid silicon powder at 0.8% of the total weight of TiC powder and NiCr alloy, and mix using a planetary ball mill for 5 hours. The mixing uniformity is ≥95% to obtain a premix.

[0095] 2) Feed the premix into the granulator and add 6% of the total weight of the premix as binder. Then granulate by rolling granulation to achieve a particle size of 0.2 mm.

[0096] 3) The prepared particles are pressed into shape on a 60-ton press under a molding pressure of 230MPa to obtain the knife handle.

[0097] 4) The molded parts are debonded using a segmented debonding process in a vacuum furnace. First, the furnace is held at 400℃ for 2 hours, then sintered at 1300℃ for 3 hours. The vacuum level inside the furnace is ≤1×10⁻⁶. -3 Pa, finally obtained the TiC-NiCr solid solution structure metal ceramic granulated blade semi-finished product;

[0098] 5) The semi-finished metal-ceramic granulation blade is finely ground with a diamond grinding wheel, with a blade runout ≤0.01mm and a surface roughness Ra≤0.2μm, to obtain the semi-finished metal-ceramic granulation cutting blade.

[0099] 6) The 40Cr material blade and the metal ceramic granulation cutting blade are welded under the process conditions of welding temperature of 108℃, holding time of 1.8 hours and welding pressure of 7MPa to prepare the metal ceramic granulation cutting blade.

[0100] Comparative Example 3:

[0101] Preparation of adhesive:

[0102] 1) Dissolve polypropylene carbonate in chloroform to prepare a polypropylene carbonate solution, then add the polypropylene carbonate solution to the reaction vessel and stir.

[0103] 2) Add NBS and CCl4 to the polypropylene carbonate solution and react at a reflux temperature of 80°C for 1-5 hours. After the reaction is complete, purify to obtain the first intermediate product.

[0104] 3) Dissolve bromophenylacetone and the first intermediate product in diethyl ether to prepare bromophenylacetone solution and the first intermediate product solution, respectively.

[0105] 4) Add metallic sodium to the reactor under the protection of inert helium gas, and then add diethyl ether as solvent to the reactor and stir at a reflux temperature of 45°C.

[0106] 5) The bromophenylacetone solution was slowly added dropwise to the reaction vessel containing metallic sodium, and then the first intermediate product solution was slowly added dropwise to the reaction vessel. After the reaction was completed and purified, modified polypropylene carbonate was obtained.

[0107] 6) The modified polypropylene carbonate was dissolved in chloroform to prepare a 30% polypropylene carbonate solution, which was then used to prepare the adhesive.

[0108] Preparation of metal-ceramic granulation blades:

[0109] 1) Mix 70 parts of TiC powder and 30 parts of NiCr alloy powder (Ni and Cr mass ratio is 3:1), add an appropriate amount of sintering aid silicon powder of 0.8% of the total weight of TiC powder and NiCr alloy, and mix using a planetary ball mill for 5 hours. The mixing uniformity is ≥95% to obtain a premix.

[0110] 2) Feed the premix into the granulator and add 6% of the total weight of the premix as binder. Then granulate by rolling granulation to achieve a particle size of 0.2 mm.

[0111] 3) The prepared particles are pressed into shape on a 60-ton press at a molding pressure of 200MPa to obtain the knife handle.

[0112] 4) The molded parts are debonded using a segmented debonding process in a vacuum furnace. First, the furnace is held at 400℃ for 2 hours, then sintered at 1300℃ for 3 hours. The vacuum level inside the furnace is ≤1×10⁻⁶. -3 Pa, finally yielded a TiC-NiCr solid solution structure metal ceramic granulated blade semi-finished product;

[0113] 5) The semi-finished metal-ceramic granulation blade is finely ground with a diamond grinding wheel, with a cutting edge runout ≤0.01mm and a surface roughness Ra≤0.2μm, to obtain the metal-ceramic granulation cutting blade.

[0114] 6) The 40Cr material blade and the metal ceramic granulation cutting blade are welded under the process conditions of welding temperature of 108℃, holding time of 1.8 hours and welding pressure of 7MPa to prepare the metal ceramic granulation cutting blade.

[0115] Comparative Example 4:

[0116] Preparation of adhesive:

[0117] 1) Dissolve polypropylene carbonate in chloroform to prepare a polypropylene carbonate solution, then add the polypropylene carbonate solution to the reaction vessel and stir.

[0118] 2) Add NBS and CCl4 to the polypropylene carbonate solution and react at a reflux temperature of 80°C for 1-5 hours. After the reaction is complete, purify to obtain the first intermediate product.

[0119] 3) Dissolve bromoacetophenone and the first intermediate product in diethyl ether to prepare bromoacetophenone solution and the first intermediate product solution, respectively.

[0120] 4) Add metallic sodium to the reactor under the protection of inert helium gas, and then add diethyl ether as solvent to the reactor and stir at a reflux temperature of 45°C.

[0121] 5) The bromophenylacetone solution was slowly added dropwise to the reaction vessel containing metallic sodium, and then the first intermediate product solution was slowly added dropwise to the reaction vessel. After the reaction was completed and purified, modified polypropylene carbonate was obtained.

[0122] 6) Dissolve phenolic resin in chloroform to prepare a phenolic resin solution with a mass fraction of 30%. Dissolve modified polypropylene carbonate in chloroform to prepare a polypropylene carbonate solution with a mass fraction of 30%. Then mix the phenolic resin solution and the modified polypropylene carbonate solution with a mass ratio of 3:20 to prepare an adhesive.

[0123] Preparation of granulated metal-ceramic cutting blades:

[0124] 1) Mix 70) parts of TiC powder and 30) parts of NiCr alloy powder (Ni and Cr mass ratio is 3:1), add an appropriate amount of sintering aid silicon powder of 0.8% of the total weight of TiC powder and NiCr alloy, and mix with a planetary ball mill for 5 hours. The mixing uniformity is ≥95% to obtain a premix.

[0125] 2) Feed the premix into the granulator and add 6% of the total weight of the premix as binder. Then granulate by rolling granulation to achieve a particle size of 0.2 mm.

[0126] 3) The prepared particles are pressed into shape on a 60-ton press under a molding pressure of 230MPa to obtain the knife handle.

[0127] 4) The molded parts are debonded using a segmented debonding process in a vacuum furnace. First, the furnace is held at 400℃ for 2 hours, then sintered at 1300℃ for 3 hours. The vacuum level inside the furnace is ≤1×10⁻⁶. -3 Pa, finally yielded a TiC-NiCr solid solution structure metal ceramic granulated blade semi-finished product;

[0128] 5) The semi-finished metal-ceramic granulation blade is finely ground with a diamond grinding wheel, with a cutting edge runout ≤0.01mm and a surface roughness Ra≤0.2μm, to obtain the metal-ceramic granulation cutting blade.

[0129] 6) The 40Cr material blade and the metal ceramic granulation cutting blade are welded under the process conditions of welding temperature of 108℃, holding time of 1.8 hours and welding pressure of 7MPa to prepare the metal ceramic granulation cutting blade.

[0130] Five semi-finished metal-ceramic granulated blades from Examples 1-3 and Comparative Examples 1-4 were taken respectively, and their appearance was observed. Their hardness, corrosion resistance, red hardness, bending strength, and service life were tested respectively. The red hardness was tested by measuring the decrease in hardness after holding at 800°C for 3 hours.

[0131] Table 1 Test Results

[0132]

[0133] The results above show that the appearance of Examples 1-3 is 100% smooth, without any pitting or wrinkling, and the service life of the blade is over 800 hours.

[0134] Comparing Comparative Example 1 and Example 3, it can be seen that Comparative Example 1 has a significantly worse appearance, with multiple pits and wrinkles appearing. Its hardness and flexural strength are also reduced, and its corrosion resistance is worse, resulting in a much shorter service life. After insulation at 800℃, the hardness decreases considerably. This indicates that using only phenolic resin as an adhesive yields very poor product performance.

[0135] Comparing Comparative Example 2 and Example 3, it can be seen that the appearance of Comparative Example 2 is also worse, with pitting appearing. Furthermore, its hardness and flexural strength are reduced, its corrosion resistance is also worse, and its service life is shortened. This indicates that the absence of bromoacetone grafted onto the modified polypropylene carbonate has a significant impact on the product preparation effect.

[0136] Comparing Comparative Example 3 and Example 3, it can be seen that the appearance of Comparative Example 3 is slightly worse, with only 20% showing pitting, and the corrosion resistance, service life, and flexural strength are slightly reduced. This comparative example shows that only phenolic resin and modified polypropylene carbonate in the adhesive have a synergistic effect. Although phenolic resin is a conventional adhesive, it is indispensable.

[0137] Comparing Comparative Example 4 and Example 3, it can be seen that after heat treatment at 800℃, the hardness reduction of Comparative Example 4 is less than that of Example 3, indicating that the red hardness of Comparative Example 4 is better than that of Example 3. However, 40% of the products in Comparative Example 4 have defects, while 60% have a smooth appearance. This indicates that the overall performance of Comparative Example 4 is still not as good as that of Example 3, and its service life is significantly reduced.

[0138] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within the present invention.

[0139] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A metal-ceramic granulation cutter, characterized in that, The raw materials for preparing the granulation cutter include TiC, NiCr, sintering aids, and binders. The binder includes phenolic resin and groups grafted onto tertiary carbon of polypropylene carbonate. Modified polypropylene carbonate.

2. The metal-ceramic granulation cutter according to claim 1, characterized in that... The mass ratio of the phenolic resin to the modified polypropylene carbonate is (1-5):(10-30).

3. The metal-ceramic granulation cutter according to claim 1, characterized in that, The raw materials for preparing the modified polypropylene carbonate include polypropylene carbonate and bromophenylacetone.

4. The metal-ceramic granulation cutter according to claim 3, characterized in that, The preparation steps of the modified polypropylene carbonate include: 1) Dissolve polypropylene carbonate in a solvent to prepare a polypropylene carbonate solution, then add the polypropylene carbonate solution into a reaction vessel and stir; 2) NBS and CCl4 are added to the polypropylene carbonate solution, and the reaction is carried out under the first process conditions to obtain the first intermediate product after purification. 3) Dissolve bromophenylacetone and the first intermediate product in a solvent to prepare bromophenylacetone solution and the first intermediate product solution, respectively; 4) Add metallic sodium to the reactor under the protection of an inert gas, and then add solvent to the reactor and stir at reflux temperature; 5) The bromophenylacetone solution was added to a reaction vessel containing metallic sodium, and then the first intermediate product solution was added to the reaction vessel. After the reaction was completed and purified, modified polypropylene carbonate was obtained.

5. The metal-ceramic granulation cutter according to claim 4, characterized in that, The first process conditions in step 1) are a reflux temperature of 70-85℃ and a reaction time of 1-5h.

6. A preparation process for a metal-ceramic granulation cutter, characterized in that, The preparation process includes the following steps: 1) Dissolve polypropylene carbonate in a solvent to prepare a polypropylene carbonate solution, then add the polypropylene carbonate solution into the reaction vessel and stir; 2) NBS and CCl4 are added to the polypropylene carbonate solution, and the reaction is carried out under the first process conditions to obtain the first intermediate product after purification. 3) Dissolve bromophenylacetone and the first intermediate product in a solvent to prepare bromophenylacetone solution and the first intermediate product solution, respectively; 4) Add metallic sodium to the reactor under the protection of an inert gas, and then add solvent to the reactor and stir at reflux temperature; 5) The bromophenylacetone solution was added to a reaction vessel containing metallic sodium, and then the first intermediate product solution was added to the reaction vessel. After the reaction was completed and purified, the modified polypropylene carbonate was obtained. 6) Prepare a phenolic resin solution and a modified polypropylene carbonate solution, and mix them in a certain proportion to form an adhesive; 7) Mix TiC powder and NiCr alloy powder in a certain proportion, add an appropriate amount of sintering aid, and mix evenly using a planetary ball mill to obtain a premix. 8) Feed the premixed material into the granulator, add the binder, and granulate using a rolling granulation method; 9) Press the prepared particles into shape on a press to obtain a cutting board; 10) The blade is debonded in a vacuum furnace using a segmented debonding process to obtain a TiC-NiCr solid solution structure metal ceramic granulated blade semi-finished product; 11) The semi-finished metal-ceramic granulation cutting blade is finely ground with a diamond grinding wheel to obtain the metal-ceramic granulation cutting blade.

7. The preparation process of the metal-ceramic granulation cutter according to claim 6, characterized in that, The manufacturing process also includes welding the blade body and the metal-ceramic granulation cutting edge to prepare a metal-ceramic granulation cutting blade.

8. The preparation process of the metal-ceramic granulation cutter according to claim 6, characterized in that, The TiC powder has a particle size of 5-10 μm, and the mass ratio of Ni to Cr in the NiCr alloy powder is (5-7):(1-3).

9. The preparation process of the metal-ceramic granulation cutter according to claim 6, characterized in that, The debonding process employs a segmented debonding technique, first holding at 200-600℃ for 2 hours, then sintering at 1250-1350℃ for 3 hours, with a furnace vacuum degree ≤1×10⁻⁶. -3 Pa.

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