High-temperature-resistant and wear-resistant diamond saw blade and preparation process thereof

Abstract

The application discloses a high-temperature-resistant and wear-resistant diamond saw blade and a preparation process thereof, and relates to the technical field of diamond saw blades. The saw blade is composed of a diamond cutter head and a steel base body, the diamond cutter head is made of an iron-based alloy matrix and diamond particles through hot-pressing sintering, and the iron-based alloy matrix is composed of the following components in a mass ratio: Fe 45-65 parts, Cu 10-20 parts, Ni 5-10 parts, Co 3-8 parts, Sn 2-6 parts, Cr 2-8 parts, Mn 1-5 parts, WC 5-12 parts, rare earth elements 0.1-0.5 parts and high-temperature solid lubricant 0.5-2 parts. Through the addition of the high-temperature solid lubricant, a self-lubricating film can be formed on the surface during the cutting of the saw blade, the friction coefficient is greatly reduced, the generation of cutting heat is effectively reduced, the high temperature generated during the cutting of the cutter head can be quickly conducted to the steel base body and dissipated, and the local overhigh temperature of the cutter head is prevented from causing the carbonization failure of the diamond.

Description

Technical Field

[0001] This invention relates to the field of diamond saw blade technology, specifically to a high-temperature resistant and wear-resistant diamond saw blade and its manufacturing process. Background Technology

[0002] Diamond saw blades are widely used in the processing of hard and brittle materials such as stone, concrete, and ceramics, as well as high-wear-resistant steel, due to their high cutting efficiency and long service life. Their performance hinges on the wear resistance, high-temperature resistance, and bonding strength between the diamond cutting head and the steel matrix. Current diamond saw blade technology often uses iron-based or copper-based alloy matrices combined with diamond particles to create the cutting head; however, this still presents several technical shortcomings in actual high-speed cutting operations.

[0003] The intense friction between the saw blade and the workpiece during cutting generates a large amount of heat, easily causing a sudden rise in the local temperature of the saw blade. This leads to carbonization and thermal erosion failure of the diamond particles. Simultaneously, the poor thermal conductivity of ordinary matrix materials prevents rapid heat dissipation, further exacerbating diamond wear. Furthermore, conventional saw blades lack highly efficient high-temperature lubricants, resulting in a high coefficient of friction. This not only increases cutting energy consumption but also accelerates matrix wear, causing premature diamond particle detachment. In addition, the bonding strength between the steel matrix and the saw blade in some saw blades is insufficient, leading to weld cracking and blade detachment under high-temperature and high-load conditions. Inadequate surface modification of the diamond particles also reduces their interfacial bonding with the matrix. Moreover, the alloy ratio design of traditional matrixes is often flawed, making it difficult to balance wear resistance and high-temperature resistance. This results in a shorter overall saw blade lifespan, and frequent blade replacements not only increase processing costs but also reduce production efficiency.

[0004] Therefore, developing a diamond saw blade that is resistant to high temperatures, wear, and has excellent overall performance, along with its supporting manufacturing process, has become an urgent technical problem to be solved in the field of hard and brittle material processing. Summary of the Invention

[0005] The purpose of this invention is to address the problems existing in the prior art by providing a high-temperature and wear-resistant diamond saw blade and its manufacturing process. This saw blade can effectively reduce the coefficient of friction during cutting, reduce heat generation during cutting, improve heat conduction and heat dissipation, enhance the bonding strength between diamond particles and the matrix, and between the blade tip and the steel substrate, while balancing high-temperature resistance and high wear resistance, extending the overall service life of the saw blade, reducing processing costs, and improving production efficiency.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0007] A high-temperature and wear-resistant diamond saw blade, the saw blade being composed of a diamond cutting head and a steel substrate;

[0008] The diamond cutting tip is made of an iron-based alloy matrix and diamond particles by hot pressing and sintering.

[0009] The iron-based alloy matrix is ​​composed of the following components in the indicated mass ratios: Fe 45-65 parts, Cu 10-20 parts, Ni 5-10 parts, Co 3-8 parts, Sn 2-6 parts, Cr 2-8 parts, Mn 1-5 parts, WC 5-12 parts, rare earth elements 0.1-0.5 parts, and high-temperature solid lubricant 0.5-2 parts.

[0010] The high-temperature solid lubricant is composed of an organic phase coated on the surface of the internal load material, and the two are connected by an interfacial coupling agent.

[0011] The internal load material is at least one of hexagonal boron nitride, graphene, and molybdenum disulfide;

[0012] The organic phase is at least one of phenolic resin, polydopamine, and epoxy resin;

[0013] The structure of the interfacial coupling agent is as follows: .

[0014] Furthermore, the preparation method of the high-temperature solid lubricant is as follows:

[0015] 1) Place the internal load material in a mixed solvent of ethanol and water in a volume ratio of (6-9):1, ultrasonically disperse for 10-40 min, filter, and then dry at 60-100℃ to obtain the pretreated internal load material;

[0016] 2) The pretreated internal load material is added to anhydrous ethanol containing an interfacial coupling agent and stirred at 40-80℃ for 1-4 hours. After the reaction is completed, the material is centrifuged, washed and dried to obtain the modified internal load material.

[0017] 3) Add the modified internally loaded material to a solution containing an organic phase precursor, adjust the pH to 8-9, reflux and stir at 60-80°C for 4-8 hours, and after filtration and washing, obtain the coated product;

[0018] 4) The coated product is dried at 80-150°C and then pulverized by airflow to obtain the high-temperature solid lubricant.

[0019] Furthermore, the steel matrix is ​​65Mn spring steel or 50Mn alloy steel, and the surface is subjected to quenching and tempering treatment.

[0020] Furthermore, the diamond particles have a particle size of 30 / 35 mesh to 50 / 60 mesh, and the surface is coated with a metal coating. The coating material is selected from at least one of Ti or Cr, and the amount added is 14%-16% of the total mass of the iron-based alloy matrix.

[0021] Furthermore, the rare earth element is at least one of La or Ce.

[0022] A method for preparing a high-temperature and wear-resistant diamond saw blade includes the following steps:

[0023] S1. Weigh the Fe, Cu, Ni, Co, Sn, Cr, Mn, WC, rare earth elements and high-temperature solid lubricant, mix them evenly, then add the diamond particles, and continue mixing at the same speed for 10-30 minutes to obtain diamond cutting head mixed powder;

[0024] S2. The mixed powder is loaded into a mold and cold-pressed under a pressure of 150-300MPa to produce a diamond cutter head segment green blank;

[0025] S3. The green blank is placed in a graphite mold and hot-pressed and sintered under an argon protective atmosphere. After cooling to room temperature, it is demolded to obtain a diamond cutting head.

[0026] S4. Weld or sinter the diamond cutting head to the outer edge of the steel substrate to form an integral saw blade;

[0027] S5. The integral saw blade is subjected to stress relief treatment and surface finishing treatment to obtain a high-temperature resistant and wear-resistant diamond saw blade.

[0028] Furthermore, in step S1, the mixing method is a three-dimensional mixer, the rotation speed during the mixing process is 30-60 r / min, and the mixing time is 2-4 hours.

[0029] Furthermore, the specific process parameters for hot pressing sintering in step S3 are as follows: sintering temperature is 800-950℃, holding time is 3-8min, and sintering pressure is 25-40MPa.

[0030] Furthermore, in step S4, the diamond tip and the steel substrate are connected by high-frequency induction brazing, the brazing filler metal is Ag-Cu-Ti active brazing filler metal, and the brazing temperature is 780-880℃.

[0031] Furthermore, the stress relief treatment in step S5 is a tempering treatment performed by holding at 200-300℃ for 2-4 hours.

[0032] Application of a high-temperature and wear-resistant diamond saw blade in fields such as high wear-resistant steel processing.

[0033] This invention achieves a multi-dimensional synergistic effect through precise formulation of the iron-based alloy matrix, customized preparation and addition of high-temperature solid lubricant, surface modification of diamond particles, and special treatment of the steel matrix. It specifically addresses technical problems in existing diamond saw blade cutting, such as diamond carbonization failure, rapid matrix wear, low bonding strength between the cutter head and matrix, and poor heat dissipation. The iron-based alloy matrix, with Fe as its core, is compounded with metals such as Cu, Ni, and Co, as well as a WC hard phase, balancing the matrix's strength, wear resistance, and thermal conductivity. The addition of Cr and Mn enhances the alloy's oxidation resistance and high-temperature stability, while La / Ce rare earth elements optimize the alloy microstructure and strengthen the interfacial bonding between the matrix and diamond particles, preventing premature diamond detachment. The customized high-temperature solid lubricant uses hexagonal boron nitride and graphene as internal loading materials, modified with an interfacial coupling agent and coated with an organic phase. In the formulation, it not only forms a self-lubricating film during saw blade cutting but also... The reduced friction coefficient minimizes cutting heat and allows for rapid heat transfer from the cutter head to the steel substrate, preventing diamond carbonization at the source. Its high-temperature resistance also makes it suitable for high-speed cutting conditions. Diamond particles coated with a Ti / Cr metal layer form a metallurgical bond with the matrix, further enhancing interfacial bonding strength and ensuring effective cutting edge extension and durability. The quenched and tempered 65Mn spring steel or 50Mn alloy steel matrix forms a strong metallurgical bond with the diamond cutter head, which is brazed using Ag-Cu-Ti active solder at high frequency. This solves the problems of weld cracking and cutter head detachment under high temperature and high load. Furthermore, the synergistic effect of the various components ensures both wear resistance and high-temperature resistance of the matrix, significantly reducing cutting energy consumption and extending the overall lifespan of the saw blade. This addresses the issues of high processing costs and low production efficiency caused by performance defects in existing saw blades.

[0034] Compared with the prior art, the beneficial effects of the present invention are:

[0035] 1. Significantly reduces the coefficient of friction and reduces cutting heat generation: By adding a high-temperature solid lubricant, a self-lubricating film can be formed on the surface during saw blade cutting, which greatly reduces the coefficient of friction and thus effectively reduces the generation of cutting heat. At the same time, it can quickly conduct the high temperature generated by the cutting head to the steel substrate to dissipate, preventing the diamond from carbonizing and failing due to excessive local temperature of the cutting head.

[0036] 2. Comprehensive improvement of saw blade wear resistance and high-temperature stability: Through precise formulation of iron-based alloy matrix, modification of the metal coating on the surface of diamond particles, and the synergistic effect of high-temperature solid lubricant, the wear resistance and oxidation resistance of the matrix are significantly improved, enabling the saw blade to maintain good cutting efficiency under high-temperature conditions and avoiding the problem of premature diamond detachment caused by excessive wear of the matrix.

[0037] 3. Significantly enhances the bonding strength between the cutter head and the steel substrate: By using Ag-Cu-Ti series active brazing filler metal for high-frequency induction brazing, combined with the quenching and tempering treatment of the steel substrate, a strong metallurgical bond is achieved between the diamond cutter head and the steel substrate, effectively solving the problems of weld cracking and cutter head detachment under high temperature and high load conditions, and extending the overall service life of the saw blade. Attached Figure Description

[0038] Figure 1 This is a comparison of the infrared spectra of hexagonal boron nitride and high-temperature solid lubricants. Detailed Implementation

[0039] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are merely some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0040] Example 1

[0041] Preparation of a high-temperature and wear-resistant diamond saw blade:

[0042] 1. Preparation of interfacial coupling agents:

[0043] ;

[0044] Under argon atmosphere, 3.17 g of compound 2 and 8.93 g of 2-(7-azabenzotriazole)-N,N,N',N'-tetramethylurea hexafluorophosphate were added sequentially to the reaction flask. Then, 80 mL of anhydrous DMF was injected using a dry syringe. Stirring was started, and the reaction flask was placed in an ice-water bath to cool to 0°C. 10.2 mL of N,N-diisopropylethylamine was slowly added through a syringe, and stirring continued at 0°C for 15 minutes to activate the carboxyl groups. Subsequently, 5.00 g of compound 1 was dissolved in 20 mL of anhydrous DMF and slowly added dropwise to the reaction system at 0°C using a constant-pressure dropping funnel over approximately 20 minutes. After the addition was complete, the ice bath was removed, and the reaction system was allowed to naturally rise to room temperature. The reaction was then stirred continuously under argon atmosphere for 12 hours. After the reaction was complete, most of the solvent was removed by rotary evaporation under reduced pressure, yielding a viscous oily residue. The residue was dissolved in ethyl acetate, washed with 5% cold LiCl aqueous solution, and then washed with cold semi-saturated brine. The layers were separated, and the organic layer was immediately transferred to an anhydrous Na2SO4 conical flask for drying. The desiccant was removed by filtration, and the filtrate was concentrated to dryness under reduced pressure to obtain the crude product. The crude product was purified by silica gel column chromatography using a mixed solvent of n-hexane and ethyl acetate as the mobile phase. The fraction containing the target product was collected, concentrated under reduced pressure, and drained under a high-vacuum oil pump to obtain 6.02 g of interfacial coupling agent.

[0045] Structural assessment:

[0046] NMR of interfacial bridging agents 1 HNMR(Chloroform-d)δ:9.00(s,1H),8.43(s,1H),7.59-7.43(m,5H),7.39-7.29(m,2H),6.86(d,1H),3.91(q,6H),1.22(t,9H).

[0047] 2. Preparation of high-temperature solid lubricants:

[0048] 1) Place hexagonal boron nitride in a mixed solvent of ethanol and water in a volume ratio of 9:1, and ultrasonically disperse it in an ultrasonic disperser for 30 minutes to ensure that the hexagonal boron nitride is fully dispersed and free from agglomeration. Filter the solution and dry it at a constant temperature of 80°C to a constant weight to obtain pretreated hexagonal boron nitride.

[0049] 2) Add all the pretreated hexagonal boron nitride to an anhydrous ethanol solution containing the interfacial coupling agent, place it in a constant temperature water bath stirrer, and stir at 60°C for 2.5 h to allow the interfacial coupling agent to be fully grafted onto the surface of the hexagonal boron nitride. After the reaction is completed, centrifuge the reaction solution, collect the solid product, wash it repeatedly with anhydrous ethanol 3 times, and then dry it at 80°C to constant weight to obtain the modified hexagonal boron nitride.

[0050] 3) Add the modified hexagonal boron nitride to an ethanol solution containing a phenolic resin precursor, adjust the pH of the system to 8.5 with dilute ammonia, and reflux and stir at 70°C for 6 hours to make the phenolic resin uniformly coat the surface of the modified hexagonal boron nitride. Filter and wash with ethanol and deionized water alternately until the filtrate is neutral to obtain the coated product.

[0051] 4) Place the coated product in a forced-air drying oven and dry it at a constant temperature of 120°C until it reaches a constant weight. Then, place the dried solid in an air jet mill to pulverize it and obtain a high-temperature solid lubricant with uniform particle size.

[0052] 3. Raw material components by weight:

[0053] Fe: 55 portions;

[0054] Cu: 15 parts;

[0055] Ni: 8 portions;

[0056] Co: 5 portions;

[0057] Sn: 4 portions;

[0058] Cr: 5 parts;

[0059] Mn: 3 parts;

[0060] WC: 8 portions;

[0061] Rare earth elements: 0.3 parts, in the form of La;

[0062] High-temperature solid lubricant: 1 part, which is the high-temperature solid lubricant prepared in the above steps;

[0063] Diamond particles: 16 parts, particle size 40 / 45 mesh, surface coated with Ti metal coating;

[0064] Steel matrix: 65Mn spring steel, quenched and tempered at high temperature.

[0065] 4. Preparation method:

[0066] S1. Weigh out Fe, Cu, Ni, Co, Sn, Cr, Mn, WC, rare earth elements and high-temperature solid lubricant and add them all into a three-dimensional mixer. Adjust the mixer speed to 45 r / min and mix at room temperature for 3 hours to ensure that the raw materials are fully mixed. Then add diamond particles and continue mixing at 45 r / min for 20 minutes to obtain diamond cutter head mixed powder.

[0067] S2. The diamond cutter head mixture powder is loaded into a custom steel mold, placed in a cold press, and cold-pressed under a pressure of 220MPa. After holding the pressure for 2 minutes, the mold is removed to obtain a diamond cutter head segment green blank.

[0068] S3. Place the diamond cutter head segment green blank in a graphite mold, put it into a hot pressing sintering furnace, introduce argon gas into the furnace to form a protective atmosphere, set the sintering process parameters: sintering temperature 850℃, holding time 5min, sintering pressure 32MPa, after hot pressing sintering is completed, cool to room temperature with the furnace and demold to obtain the finished diamond cutter head.

[0069] S4. The diamond cutting head is welded to the outer edge of the 65Mn spring steel substrate using a high-frequency induction brazing process. The brazing filler metal is Ag-Cu-Ti active brazing filler metal. The brazing temperature is controlled at 830℃. After holding at the temperature for 1 minute, it is naturally cooled to form a strong metallurgical bond between the diamond cutting head and the steel substrate, resulting in an integral saw blade.

[0070] S5. Place the entire saw blade in a tempering furnace and keep it at 250℃ for 3 hours to relieve stress. After stress relief, use a CNC grinding machine to perform surface finishing on the saw blade, and finally obtain a high-temperature and wear-resistant diamond saw blade.

[0071] Example 2-Example 3

[0072] The preparation of a high-temperature and wear-resistant diamond saw blade involves replacing the mass fractions of the raw materials, while keeping other operations the same as in Example 1. See Table 1 for details.

[0073] Table 1. Mass fractions of each raw material in Examples 2 and 3

[0074] Fe Cu Ni Co Sn Cr Mn WC Rare earth elements High-temperature solid lubricants diamond particles Example 2 45 copies 10 copies 5 copies 3 copies 2 copies 2 copies 1 copy 5 copies 0.1 copies 0.5 copies 11 copies Example 3 65 copies 20 copies 10 copies 8 copies 6 copies 8 copies 5 copies 12 copies 0.5 copies 2 copies 21 copies

[0075] Comparative Example 1

[0076] The preparation of a high-temperature and wear-resistant diamond saw blade is carried out by referring to the preparation method of Example 1, except that the high-temperature solid lubricant is replaced with hexagonal boron nitride, and the rest is the same as in Example 1.

[0077] Comparative Example 2

[0078] The preparation of a high-temperature and wear-resistant diamond saw blade is the same as in Example 1, except that the high-temperature solid lubricant is not added.

[0079] Comparative Example 3

[0080] The preparation of a high-temperature and wear-resistant diamond saw blade is carried out by referring to the preparation method of Example 1, wherein the diamond particles are selected as 40 / 45 mesh uncoated Ti / Cr metal particles, and the rest are the same as in Example 1.

[0081] Comparative Example 4

[0082] The preparation of a high-temperature and wear-resistant diamond saw blade is carried out according to the preparation method of Example 1. When preparing the high-temperature solid lubricant, the specific interfacial coupling agent of the present invention is replaced with an equal amount of KH-550, and the rest is the same as in Example 1.

[0083] Performance testing

[0084] 1. Wear resistance test: Select standard granite test blocks (Mohs hardness 6-7, size 1000mm×500mm×50mm), mount the diamond saw blades prepared in each embodiment and comparative example on the wear resistance testing machine, and continuously cut the standard test blocks while maintaining stable working conditions during the cutting process; before cutting, dry the saw blade to constant weight and weigh it (recorded as m1), after cutting, clean the saw blade and dry it again to constant weight (recorded as m2), calculate the wear amount of the cutter head Δm=m1-m2, and the results are shown in Table 2.

[0085] 2. High temperature resistance test:

[0086] 2.1. Place the diamond saw blades prepared in each embodiment and comparative example in a muffle furnace, heat them to 800°C at 10°C / min, keep them at that temperature for 1 hour, and then cool them to room temperature with the furnace. Observe whether the saw blades have matrix oxidation or interface cracking.

[0087] 2.2. The cutting efficiency of the diamond saw blades prepared in each embodiment and the comparative example on the standard concrete specimen was tested at room temperature (denoted as v1); then the saw blades were kept in a muffle furnace at 600℃ for 30 min, and then immediately subjected to high-temperature cutting test. The cutting efficiency was measured under the same parameters (denoted as v2), and the high-temperature cutting efficiency retention rate η=v2 / v1×100% was calculated. The results are shown in Table 2.

[0088] 3. Bond strength test: The diamond saw blades prepared in each embodiment and comparative example were fixed on the fixture of a universal testing machine. A pull-out force perpendicular to the steel substrate was applied to the diamond saw head until the saw head separated from the steel substrate. The maximum pull-out force was recorded and the bond strength was calculated. The results are shown in Table 2.

[0089] Table 2. Performance Test Data Results

[0090] Wear amount (g) Saw blade condition after high temperature High-temperature cutting efficiency retention rate (%) Bond strength (MPa) Example 1 0.42 No matrix oxidation, no interface cracking 92.5 87 Example 2 0.49 No matrix oxidation, no interface cracking 89.2 82 Example 3 0.45 No matrix oxidation, no interface cracking 92.1 85 Comparative Example 1 1.56 Slight oxidation of the tire body, with no interface cracking. 82.6 77 Comparative Example 2 1.83 The tire body showed obvious oxidation, but no interface cracking. 65.4 58 Comparative Example 3 1.47 Slight oxidation of the tire body, with no interface cracking. 78.9 55 Comparative Example 4 1.19 Slight oxidation of the tire body, with no interface cracking. 85.7 68

[0091] According to the performance test data in Table 2, the diamond saw blade of the present invention is significantly superior to the comparative examples in terms of wear resistance, high-temperature resistance, and bonding strength. Compared with the comparative example using unmodified hexagonal boron nitride, the saw blade of the present invention shows significantly improved wear resistance and high-temperature stability; compared with the comparative example without the addition of high-temperature solid lubricant, the saw blade of the present invention shows significantly improved wear resistance, high-temperature resistance, and blade-substrate bonding strength; compared with the comparative example using diamond particles without metal coating, the saw blade of the present invention shows significantly improved wear resistance, high-temperature efficiency retention, and bonding strength; compared with the comparative example using conventional interface coupling agents instead of the specific coupling agent of the present invention, the saw blade of the present invention also shows significant advantages in various performance indicators. Overall, the present invention achieves a comprehensive improvement in the overall performance of the saw blade through the synergistic effect of rare earth elements, high-temperature solid lubricant, surface-modified diamond particles, and specific interface coupling agent.

[0092] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A high-temperature resistant and wear-resistant diamond saw blade, characterized in that, The saw blade consists of a diamond cutting head and a steel base; The diamond cutting tip is made of an iron-based alloy matrix and diamond particles by hot pressing and sintering. The iron-based alloy matrix is ​​composed of the following components in the indicated mass ratios: Fe 45-65 parts, Cu 10-20 parts, Ni 5-10 parts, Co 3-8 parts, Sn 2-6 parts, Cr 2-8 parts, Mn 1-5 parts, WC 5-12 parts, rare earth elements 0.1-0.5 parts, and high-temperature solid lubricant 0.5-2 parts. The high-temperature solid lubricant is composed of an organic phase coated on the surface of the internal load material, and the two are connected by an interfacial coupling agent. The internal load material is at least one of hexagonal boron nitride, graphene, and molybdenum disulfide; The organic phase is at least one of phenolic resin, polydopamine, and epoxy resin; The structure of the interfacial coupling agent is as follows: .

2. The high-temperature resistant and wear-resistant diamond saw blade according to claim 1, characterized in that, The preparation method of the high-temperature solid lubricant is as follows: 1) Place the internal load material in a mixed solvent of ethanol and water in a volume ratio of (6-9):1, ultrasonically disperse for 10-40 min, filter, and then dry at 60-100℃ to obtain the pretreated internal load material; 2) The pretreated internal load material is added to anhydrous ethanol containing an interfacial coupling agent and stirred at 40-80℃ for 1-4 hours. After the reaction is completed, the material is centrifuged, washed and dried to obtain the modified internal load material. 3) Add the modified internally loaded material to a solution containing an organic phase precursor, adjust the pH to 8-9, reflux and stir at 60-80°C for 4-8 hours, and after filtration and washing, obtain the coated product; 4) The coated product is dried at 80-150°C and then pulverized by airflow to obtain the high-temperature solid lubricant.

3. The high-temperature resistant and wear-resistant diamond saw blade according to claim 1, characterized in that, The steel matrix is ​​65Mn spring steel or 50Mn alloy steel, and the surface is quenched and tempered.

4. The high-temperature resistant and wear-resistant diamond saw blade according to claim 1, characterized in that, The diamond particles have a particle size of 30 / 35 mesh to 50 / 60 mesh and are coated with a metal coating. The coating material is selected from at least one of Ti or Cr and is added in an amount of 14%-16% of the total mass of the iron-based alloy matrix.

5. The high-temperature resistant and wear-resistant diamond saw blade according to claim 1, characterized in that, The rare earth element is at least one of La or Ce.

6. A method for preparing a high-temperature resistant and wear-resistant diamond saw blade according to any one of claims 1-5, characterized in that, Includes the following steps: S1. Weigh the Fe, Cu, Ni, Co, Sn, Cr, Mn, WC, rare earth elements and high-temperature solid lubricant, mix them evenly, then add the diamond particles, and continue mixing at the same speed for 10-30 minutes to obtain diamond cutting head mixed powder; S2. The mixed powder is loaded into a mold and cold-pressed under a pressure of 150-300MPa to produce a diamond cutter head segment green blank; S3. The green blank is placed in a graphite mold and hot-pressed and sintered under an argon protective atmosphere. After cooling to room temperature, it is demolded to obtain a diamond cutting head. S4. Weld or sinter the diamond cutting head to the outer edge of the steel substrate to form an integral saw blade; S5. The integral saw blade is subjected to stress relief treatment and surface finishing treatment to obtain a high-temperature resistant and wear-resistant diamond saw blade.

7. The method for preparing a high-temperature and wear-resistant diamond saw blade according to claim 6, characterized in that, In step S1, the mixing method is a three-dimensional mixer, the rotation speed during the mixing process is 30-60 r / min, and the mixing time is 2-4 hours.

8. The method for preparing a high-temperature and wear-resistant diamond saw blade according to claim 6, characterized in that, The specific process parameters for hot pressing sintering in step S3 are as follows: sintering temperature is 800-950℃, holding time is 3-8min, and sintering pressure is 25-40MPa.

9. The method for preparing a high-temperature resistant and wear-resistant diamond saw blade according to claim 6, characterized in that, In step S4, the diamond tip and the steel substrate are connected by high-frequency induction brazing. The brazing filler metal is Ag-Cu-Ti active brazing filler metal, and the brazing temperature is 780-880℃.

10. The method for preparing a high-temperature resistant and wear-resistant diamond saw blade according to claim 6, characterized in that, The stress relief treatment in step S5 is a tempering treatment that involves holding the temperature at 200-300℃ for 2-4 hours.

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