BE1026934B1 - Powder mixture for diamond saw blade - Google Patents

Abstract

The present disclosure discloses a powder mixture for a diamond saw blade, which has the following composition in percent by mass: 75% -96% copper, 1.5% -19% iron, 0.5% -5% cobalt, 0.4% -1.5 % Chromium, 0.1% -1% zirconium, and 0.01% -0.1% graphene oxide, the powder mixture produced having a grain size smaller than 300 mesh, and the production process therefor being as follows, using a copper alloy by vacuum melting of Copper, chromium and zirconium, weighed in a certain ratio, are obtained in a vacuum melting furnace; pre-alloyed powders are prepared from the copper alloy using a combined atomization of gas and water process; the pre-alloyed powder and iron powder coated with cobalt and dispersing liquid of graphene oxide are placed in a ball mill and mixed there under the protection of nitrogen for 6 hours, whereby a powder mixture is obtained; and the powder mixture is then dried, then a final powder mixture is obtained.

Description

Powder mixture for diamond saw blade

Technical field

The present disclosure relates to the technical field of manufacturing diamond saw blades, and more particularly relates to a powder mixture for a diamond saw blade.

Technical background

A saw blade made from diamonds is widely used in grinding

19 different metal materials and stone materials are used, however, the working conditions for diamond saw blades are relatively harsh, and high speeds, vibrations and high temperatures place severe demands on the welding of the diamond cutting head; in addition, with continuously increasing cutting speed and cutting depth of saw blades, ever higher

Requirements placed on strength, life and cost of diamond saw blades, At present, the most conspicuous problem that limits the diamond saw blade is that the matrix has poor holding strength against diamond blades, which makes the diamond blades difficult to protrude and easy are to fail

and therefore the tool life and machining efficiency are significantly reduced, The interface state between diamond abrasive grains and the matrix, and the microstructure of the matrix and its mechanical properties are major factors that determine the properties and life of a diamond tool,

At present, the matrix materials for diamond saw blades mainly include resin-based materials, ceramic-based materials, and metal-based materials, with metal-based materials being widely used because of their good thermoforming properties, high adhesive strength, and quick heat dissipation.

Sintered metal-based matrix materials can according to the

Main components of the matrix can be divided into cobalt-based, tungsten-based, iron-based and copper-based materials.

Copper-based matrix materials have good toughness, corrosion resistance, good sintering performance at low temperature, low price, high protusion, but poor wettability and poor hardness and strength, currently used matrix materials

Copper base mainly include the following arias:

(1) Bronze-based metals: alloys primarily based on copper and tin have narrow applications, mostly in grinding tools; and the flexural strength thereof is not high, and their mechanical properties are to be changed in applications by adding further trace elements;

40 (2) White Copper-Based Metals: Nickel-silver and manganese-white-copper are more commonly used, among them, nickel-silver is an alloy composed mainly of copper and nickel, and manganese-white-copper is an alloy composed mainly of three elements of copper , Nickel, and manganese, and the two have applications mostly in drill bits for oil drilling and geological drilling. In applications, an appropriate amount of cobalt, chromium, tin and tungsten based on a range of copper base can be added to alter the properties of the base alloys; (3) Brass-based metals: Brass-based matrix materials are a copper and zinc-based alloy, which have high brittleness; and an appropriate amount of elements such as iron, nickel, and tin is to be added in applications to increase strength and decrease sintering temperature; Cobalt-based matrix materials have good adhesion properties at low temperatures, are resistant to high temperatures, and have good wettability to diamonds, low thermal erosion, high adhesive strength, and can maintain good mechanical properties even in a high-temperature application environment, while having good abrasion resistance. However, cobalt resources are scarce in China, so cobalt is expensive and limited in applications. Subject of Application To solve the above problems, the present disclosure provides a powder mixture for a diamond saw blade, thus eliminating the problems such as low strength of a copper-based diamond saw blade, deteriorated properties of applications at a high temperature and high cost of cobalt powders are to be solved.

The present disclosure is implemented by the following technical solutions: A powder mixture for a diamond saw blade has the following composition in percent by mass: 75% -96% copper, 1.5% -19% iron, 0.5% -5% cobalt, 0.4 % -1.5% chromium, 0.1% -1% zirconium, and 0.01% -0.1% graphene oxide.

Furthermore, the powder mixture for a diamond saw blade has the following composition in percent by mass: 80% -96% copper, 1.5% -14.5% iron, 0.5% -3.5% cobalt, 0.4% -1.5 % Chromium, 0.1% -0.7% zirconium, and 0.01% -0.1% graphene oxide.

Furthermore, the powder mixture for a diamond saw blade has the following composition in percent by mass: 81% -93% copper, 4.8% -14.5% iron, 1.2% -3.5% cobalt, 0.4% -1.1 % Chromium, 0.1% -0.5% zirconium, and 0.01% -0.1% graphene oxide.

A method for producing a powder mixture for a diamond saw blade comprises the following steps:

Step 1: Weighing copper, chromium and zirconium according to the above mass proportions, and vacuum melting the mixture in a vacuum melting furnace, thereby obtaining a copper alloy, in preparation for the following steps; Step 2: preparing pre-alloy powders from the copper alloy using a combined atomization of gas and water process to prepare for the following steps; Step 3: Manufacture iron powders coated with cobalt to prepare for the following steps; Step 4: Preparing a dispersing liquid of graphene oxide to prepare for the following steps; Step 5: Place the pre-alloyed powder prepared in Step 2, the Elsen powder coated with cobalt prepared in Step 3, and the graphene oxide dispersing liquid prepared in Step 4 in a ball mill, mix the powders there under the protection of nitrogen for 6 hours, and obtain a mixture of materials to prepare for the following steps, the ball mill having a speed of 500 rimin; and Step 6: placing the material mixture obtained in Step 5 in a vacuum drying cabinet for drying, and obtaining a final powder mixture, wherein the drying temperature is in the range of 60-120 ° C, drying takes 6-24 hours, and the degree of vacuum is not lower than 5x 10 ° Pa.

Furthermore, the atomization gas in the combined atomization of gas and water in step 2 is nitrogen, furthermore the pre-alloyed powders which are produced after the atomization in step 2 are filtered by means of a 300-mesh sieve, furthermore the oxygen content is in the pre-alloyed powders made after atomization in step 2, under control below 1000 ppm.

Furthermore, the method for producing the iron powder coated with cobalt in step 3 comprises the following sub-step: 31: Adding cobalt chloride hexahydrate, citric acid, hydrazine and a dispersant PEG deionized water for complete dissolution, and adjusting the pH to 13 by adding of NaOH for making an electroplating bath, wherein in the electroplating bath, the mass concentration of cobalt chloride hexahydrate is 25 g / L, the concentration of citric acid is 25 g / L, and the concentration of hydrazine is 0.8 mol / L; S2: Adding 500-mesh iron powder to the plating bath, and heating the solution in a water bath at 80 ° C for one hour, whereby a reacted plating bath is obtained, and while heating the mixture is continuously stirred, and the mass-to- Volume ratio between the iron powders and the electroplating bath is 15 g: 1 L; and

S3: filtering and washing the reacted plating bath, placing the plating bath in a vacuum drying cabinet to dry, and then obtaining iron powders coated with cobalt, the drying temperature being 90 ° C, drying taking 2 hours, and the degree of vacuum not lower than 5x103 Pa Yeg

Furthermore, the method for producing the dispersing liquid of graphene oxide in step 3 comprises the following substeps: 31: Laying graphene oxide in anhydrous acetic acid, stirring the mixture with a magnetic stirrer for 10 minutes, and then obtaining a uniformly mixed solution by supersonic vibration with heating at 80 ° C for one hour after stirring to prepare for the following steps, wherein the mass-to-volume ratio between the graphene oxide and the anhydrous acetic acid is 1 g: 500 ml; and 52: Mixing the solution mixture obtained in S1 with acetone, and obtaining a dispersing liquid of graphene oxide by supersonic vibration with heating at 80 ° C. for one hour, the volume ratio between the solution mixture and acetone being 1: 1.

The present disclosure has the following advantageous effects: First, the powder mixture according to the invention mainly contains copper, cobalt, iron, chromium, zirconium and graphene oxide; based on copper powders, iron powder coated with cobalt is added, with cobalt in the outer layer of the iron powder enabling a solid metallurgical bond between the matrix and diamond, and improving the adhesive strength between the matrix and diamond; Iron in the inner layer helps to reduce costs and iron has physical properties similar to those of cobalt; by adding chromium, a copper alloy of copper and chromium is formed and the wettability of the matrix with respect to diamonds is thereby improved; a mixed crystal with the copper alloy is formed by adding zirconium, and thereby the strength of the matrix is increased; and graphene oxide is also added, which is evenly distributed on sintered matrix, the use of graphene oxide in the diamond saw blade realizes good lubrication, thereby increasing the cutting performance, reducing the frictional heat, and extending the life of the diamond saw blade, while graphene oxide is sine contains an oxygen-containing functional group that forms a dispersed metal oxide with the metal during sintering, thereby improving the strength of the matrix; Second, in comparison with cobalt powders, the powder mixture according to the invention enables a strong metallurgical bond between diamond and the matrix, the adhesive strength being high and the adhesive force for diamond being high; The manufacture of the cutting head of the diamond saw blade requires a low temperature and therefore causes little thermal damage to the diamond, therefore, if used at a high temperature, diamond can still maintain good mechanical properties, and little heat is generated during use which is damage to the diamond low; and only a low cobali metal content and low cost are required, the date being an example

Nov 14, 2018 is called when the average price for electrolytic copper is 49,000 5 RMB / ton, and the average price for electrolytic cobalt is 432,000 RMB / ton, therefore the cost can be significantly reduced, which facilitates extensive applications, Detailed Description of the Embodiments The present The disclosure is to be described in more detail below with reference to specific embodiments: Embodiment 1: First, a powder mixture for a diamanise blade was prepared, and the powder mixture had the following composition in percent by mass. 93% copper, 4.8% iron, 1.2% cobalt, 0.6% chromium, 0.38% zirconium, and 0.02% graphene oxide, with no aggregation occurring. A method for preparing the powder mixture comprises the following steps: Step 1: Weighing copper, chromium and zirconium according to the above mass proportions, and vacuum melting the mixture in a vacuum melting furnace, thereby obtaining a copper alloy, in preparation for the following steps; Step 2: Prepare pre-alloyed powders from the copper alloy using a combined atomization of gas and water process to prepare for the following steps; wherein the atomization gas in the combined atomization of gas and water is nitrogen, and the pre-alloyed powders produced after the atomization are filtered by means of a 300-mesh sieve so that the oxygen content in the pre-alloyed powders produced after the atomization is under control below 1000 ppm ; Step 3: Manufacture of iron powders coated with cobalt, the process for the manufacture of iron powders coated with cobalt comprising the following sub-steps: Si: Adding cobalt chloride hexahydrate, citric acid, hydrazine and a dispersant PEG a deionized water for complete dissolution, and adjusting the pH value to 13 by adding NaOH to produce an electroplating bath, where in the electroplating bath, the mass concentration of cobalt chloric hexahydrate is 25 g / L, the concentration of citric acid is 25 g / L, and the concentration of hydrazine is 0, Is 8 mol / L; SZ: adding 500-mesh iron powders to the plating bath, and heating the solution in a water bath at 80 ° C for one hour, thereby obtaining a reacted plating bath, and while heating, the mixture is continuously stirred and the mass-closed - Volume ratio between the iron powders and the electroplating bath 15 g: 1 L contributes; and

83: Filtering and washing of the reacted electroplating bath, the electroplating bath being washed first twice with deionized water and then washed once with acetone; Put the electroplating bath after washing in a vacuum drying cabinet, and then get iron powder 5 coated with cobalt, the drying temperature being 90 ° C, drying takes 2 hours, and the degree of vacuum is not lower than 5x103 Pa, step 4: Producing a dispersing liquid of graphene oxide, the method for producing the dispersing liquid of graphene oxide comprising the following steps: St: placing graphene oxide in anhydrous acetic acid, stirring the mixture by means of a magnetic stirrer for 10 minutes, and then obtaining a uniformly mixed solution mixture by supersonic vibration with heating at 80 ° C for one hour after stirring to prepare for the following steps, where the mass-to-volume ratio between the graphene oxide and the anhydrous acetic acid is 1 g: 500 mL, and the carboxyl group of the anhydrous acetic acid with the active functional group in to react with the graphene oxide, wodu The polarity of the graphene oxide is increased and the aggregation is reduced; and 82: Mixing the solution mixture obtained in Si with acetone, and obtaining a dispersing liquid of graphene oxide by supersonic vibration with heating at 80 ° C for one hour, the volume ratio between the solution mixture and acetone being 1: 1, and the time for the powder mixing for Complete mixing of graphene oxide with the pre-alloyed powders is shortened, and the dispersing liquid of graphene oxide is to be used within one hour after preparation; Step 5: Place the pre-alloyed powder produced in step 2, the iron powder coated with cobalt produced in step 3, and the graphene oxide dispersing liquid produced in step 4 in a ball mill, mix the powder there under the protection of nitrogen for 6 hours, and then Obtaining a material mixture to prepare for the following steps, wherein the ball mill has a speed of 600 r / min; and Step 6: placing the material mixture obtained in Step 5 in a vacuum drying cabinet for drying, and obtaining a final powder mixture, wherein the drying temperature is in the range of 60-120 ° C, drying takes 6-24 hours, and the degree of vacuum is not lower than 5x10% Pa.

The powder mixture produced is copper-based matrix powder, and is applicable to the production of a diamond composite block, the process steps for producing the diamond composite block being as follows: (1) Mixing: The copper-based matrix powder and diamond particles! were placed in a mixer at a volume ratio of 7: 3 and mixed there uniformly to obtain a mixture;

(2) Hot press sintering: The mixture was sintered at a temperature of 850 ° C for 2 minutes using a vacuum hot press sintering machine, thereby obtaining a diamond composite block; The above diamond composite block was soldered to a granite saw blade with low quality, and in comparison with a diamond composite block, which is currently mainly used cobali-based matrix powders, the service life of the granite saw blade reaches 80% of its service life, embodiment 2: First was a powder mixture for a diamond saw blade, and the powder mixture had the following composition in percent by mass: 87% copper, 9.6% iron, 2.4% cobalt, 0.6% chromium, 0.35% zirconium, and 0.05% graphene oxide, with no aggregation taking place. A method for preparing the powder mixture comprises the steps of: Step 1: Weighing copper, chromium and zirconium, and vacuum melting the mixture in a vacuum melting furnace, thereby obtaining a copper alloy to prepare for the following steps; Step 2: preparing pre-alloy powders from the copper alloy using a combined atomization of gas and water process to prepare for the following steps; wherein the atomizing gas in the combined atomization of gas and water is nitrogen, and the pre-alloyed powders produced after the atomization are filtered by means of a 300-mesh sieve so that the oxygen content in the pre-alloyed powders produced after the atomization is under control below 1000 ppm ; Step 3: Production of iron powders coated with cobalt, the method for producing iron powders coated with cobalt comprising the following sub-steps.

Si: Adding cobalt chloride hexahydrate, citric acid, hydrazine and a dispersing agent! PEG a deionized material for complete dissolution, and adjusting the pH value to 13 by adding NaCH to produce an electroplating bath, the mass concentration of cobalt chlorohexahydrate being 25 g / L, the concentration of citric acid being 25 g / l in the electroplating bath. L is and the concentration of hydrazine is 0.8 mol / L; S2: Adding 500-mesh iron powder to the electroplating bath, and heating the solution in a water bath at 80 ° C for one hour, whereby a reactive electroplating bath is obtained, and while heating the mixture is continuously stirred, and the mass-to- Volume ratio between the iron powders and the electroplating bath is 15 g: 1 L; and S3: filtering and washing the reacted electroplating bath, the electroplating bath being washed first twice with deionized water and then washed once with acetone; After washing, placing the electroplating bath in a vacuum drying cabinet to dry, and then obtaining iron powder coated with cobalt, the drying temperature being 90 ° C, drying taking 2 hours, and the degree of vacuum not lower than 5x105 Pa.

Step 4: preparing a dispersing liquid of graphene oxide, the method for preparing the dispersing liquid of graphene oxide comprising the following sub-step: S1: placing graphene oxide in anhydrous acetic acid, stirring the mixture with a magnetic stirrer for 10 minutes, and then obtaining a uniformly mixed solution mixture by supersonic vibration Heat at 80 ° C for one hour after stirring to prepare for the following steps, where the mass-to-volume ratio between the graphene oxide and the anhydrous acetic acid is 1 g: 500 ml, and the carboxyl group of the anhydrous acetic acid with the active functional group in the graphene oxide is to react, thereby increasing the polarity of the graphene oxide and reducing the aggregation; 32: Mixing the solution mixture obtained in Si with acetone, and obtaining a dispersing liquid of graphene oxide by supersonic vibration with heating at 80 ° C for one hour, the volume ratio between the solution mixture and acetone being 1: 1, and the time for the powder mixture to be complete Mixing graphene oxide with the pre-alloyed powders is shortened and the graphene oxide dispersing liquid is to be used within one hour of preparation; Step 5: Place the pre-alloyed powder produced in step 2, the iron powder coated with cobalt produced in step 3, and the graphene oxide dispersing liquid produced in step 4 in a ball mill, mix the powders there under the protection of nitrogen for 6 hours, and obtain a material mixture to prepare for the following steps, wherein the ball mill has a speed of 600 min; and step 6: placing the material mixture obtained in step 5 in a vacuum skirting cabinet for drying, and obtaining a final powder mixture, wherein the drying temperature is in the range of 60-120 ° C, drying takes 6-24 hours, and the degree of vacuum is not lower than 5x 105 Pa.

The powder mixture produced is copper-based matrix powder, and is applicable to the production of a diamond composite block, the process steps for producing the diamond composite block being as follows: (1) Mixing: The copper-based matrix powder and diamond particles! were placed in a mixer at a volume ratio of 7: 3 and mixed there uniformly to obtain a mixture; (2) Hot press sintering: The mixture was sintered at a temperature of 850 ° C for 2 minutes using a vacuum hot press sintering machine, thereby obtaining a diamond composite block; 40 The above diamond composite block was soldered to a granite saw blade with low quality, and in comparison with a diamond composite block, which is currently mainly used cobalt-based matrix powders, the life of the granite saw blade reaches 84% of its life. Embodiment 3: First, a powder mixture for a diamond saw blade was prepared, and the powder mixture had the following composition in percent by mass: 81% copper, 14.5% iron, 3.5% cobalt, 0.8% chromium, 0.3% zirconium, and 0.1% graphene oxide, with no aggregation taking place. A method for preparing the powder mixture comprises the following steps: Step 1: Weighing copper, chromium and zirconium, and vacuum melting the mixture in a vacuum melting furnace, thereby obtaining a copper alloy, to the following steps Prepare steps; Step 2: Making pre-alloyed powders from the copper alloy using a combined gas and water atomization process to prepare for the following steps; wherein the atomizing gas in the combined atomization of gas and water is nitrogen, and the pre-alloyed powders produced after the atomization are filtered by means of a 300-mesh sieve so that the oxygen content in the pre-alloyed powders produced after the atomization is under control below 1000 ppm ; Step 3: Production of iron powders coated with cobalt, the process for producing iron powders coated with cobalt comprising the following sub-steps: Si: adding cobalt chloride hexahydrate, citric acid, hydrazine and a dispersant PEG a deionized material for complete dissolution, and setting the pH to 13 by adding NaOH to make an electroplating bath, where in the electroplating bath, the mass concentration of cobalt chloride hexahydrate is 25 g / L, the concentration of citric acid is 25 g / L, and the concentration of hydrazine is 0.8 mol / L is; 32: Adding 500-mesh iron powders to the electroplating bath, and heating the solution in a water bath at 80 ° C for one hour, whereby a reacted electroplating bath is obtained, and while heating the mixture is continuously stirred, and the mass-to- Volume ratio between the iron powder and the electroplating bath is 15 g: 1 L; and 53: filtering and washing the reacted electroplating bath, the electroplating bath being washed first with deionized water twice and then washed once with acetone; After washing, placing the electroplating bath in a vacuum drying cabinet to dry, and then obtaining iron powders coated with cobalt, the drying temperature being 90 ° C, drying taking 2 hours, and the degree of vacuum not lower than 5 * 10 ° Pa.

Step 4: producing a dispersing liquid of graphene oxide, the method for producing the dispersing liquid of graphene oxide comprising the following 40 substeps:

St: Put graphene oxide in anhydrous acetic acid, stir the mixture by means of a magnetic stirrer for 10 minutes, and then obtain an evenly mixed solution mixture by supersonic vibration with heating at 80 ° C for one hour after stirring to prepare for the following steps, wherein the mass- to volume ratio between the graphene oxide and the anhydrous acetic acid 1 g: 500 ml contributes, and the carboxy group of the anhydrous acetic acid is to react with the active functional group in the graphene oxide, whereby the polarity of the graphene oxide is increased, and the aggregation is reduced ; and S2: Mixing the mixed solution obtained in S1 with acetone, and obtaining a dispersing liquid of graphene oxide by supersonic vibration with heating at 80 ° C for one hour, the volume ratio between the mixed solution and acetone being 1: 1, and the time for the powder mixture for Complete mixing of graphene oxide with the prealloyed powders is shortened, and the dispersing liquid of graphene oxide is to be used within one hour after preparation; Step 5: Place the pre-alloyed powder prepared in Step 2, the Elsen powder coated with cobalt prepared in Step 3, and the graphene oxide dispersing liquid prepared in Step 4 in a ball mill, mix the powders there under the protection of nitrogen for 6 hours, and obtain a material mixture to prepare for the following steps, wherein the ball mill has a speed of 600 rimin; and step 6: placing the material mixture obtained in step 5 in a vacuum drying cabinet for drying, and obtaining a final powder mixture, wherein the drying temperature is in the range of 60-120 ° C, drying takes 8-24 hours, and the degree of vacuum is not lower than 5x 107 Pa.

The powder mixture produced is copper-based matrix powder, and is applicable to the production of a diamond composite block, the process steps for producing the diamond composite block being as follows: (1} Mixing: The copper-based matrix powder and diamond particles were mixed according to a volume ratio of 7: 3 in a mixing machine and uniformly mixed there to obtain a mixture; (2) hot press sintering: the mixture was sintered at a temperature of 850 ° C for 2 minutes using a vacuum healing press sintering machine, thereby obtaining a diamond composite block; the above Diamond composite block was soldered to a granite saw blade with low quality, and in comparison with a diamond composite block, which is currently mainly used cobalt-based matrix powder, the life of the granite saw blade reaches 90% of its life, 40fn BE2019 / 5340 control embodiment Die Diamant -Compound blocks manufactured i n Embodiments 1-3 were taken, and a diamond composite block was also used for comparison, which is made from cobalt-based matrix powders, and indices for the hardness and abrasion resistance thereof were determined, a Brinell hardness tester was used for determining the hardness, and the samples measured 40 x 8 x 3.2 mm.

An abrasion testing machine was used to determine the abrasion resistance, and the samples were 12 × 12 × 20 mm in size, the speed of rotation was 500 rpm, the load was 200 N, and the test lasted 8 minutes, and the test results were shown in Table 1 below are: Tables 1 Test results of the properties of various diamond composite blocks Projects Hardness (HB) Weight loss through | Abrasion (mg) | Embodiment 1 88 | Embodiment 2 [212 B Embodiment 3 | 229 59 | Check example 54 | It can be seen from Table 1 that the hardness and abrasion resistance of the composite diamond blocks made from copper-based matrix powders in Examples 1-3 are all approximately the same as those of the composite diamond block made from cobalt-based matrix powders for comparison.

Shown and described above are only the basic principles, main features, and advantages of the present disclosure, and it will be understood by those skilled in the art that the present disclosure is not limited to the above embodiments.

The foregoing embodiments and description are only illustrative of the principles of this disclosure, and various changes and modifications to this disclosure may be made without departing from the spirit and scope of this disclosure, and these changes and modifications are also within the scope of the present disclosure and the The scope of the disclosure is defined by the appended claims and their equivalents.

Claims (9)

Expectations 1. Powder mixture for a diamond saw blade, characterized in that the powder mixture has the following composition in percent by mass: 75% -96% copper, 1.5% -19% iron, 0.5% -5% cobalt, 0.4% -1 , 5% chromium, 0.1% -1% zirconium, and 0.01% -0.1% graphene oxide. 2. Powder mixture for a diamond saw blade according to claim 1, characterized in that the powder mixture has the following composition in percent by mass: 80% -96% copper, 1.5% -14.5% iron, 0.5% -3.5% cobalt , 0.4% -1.5% chromium, 0.1% -0.7% zirconium, and 0.01% -0.1% graphene oxide. 3. Powder mixture for a diamond saw blade according to claim 2, characterized in that the powder mixture has the following composition in percent by mass: 81% -93% copper, 4.8% -14.5% iron, 1.2% -3.5% cobalt , 0.4% -1.1% chromium, 0.1% -0.5% zirconium, and 0.01% -0.1% graphene oxide. 4. A method for producing a powder mixture for a diamond saw blade according to any one of claims 1-3, characterized in that the method comprises the following steps: Step 1: Weighing of copper, chromium and zirconium, and vacuum melting the mixture in a vacuum melting furnace, whereby a copper alloy is obtained to prepare for the following; Step 2: preparing pre-alloyed powders from the copper alloy using a combined atomization of gas and water process to prepare for the following steps; Step 3: making iron powders coated with cobalt to prepare for the following steps; Step 4: preparing a dispersing liquid of graphene oxide to prepare for the following steps; Step 5: Place the pre-alloyed powder prepared in Step 2, the iron powder coated with cobalt prepared in Step 3, and the graphene oxide dispersing liquid prepared in Step 4 in a ball mill, mix the powders there under the protection of nitrogen for 6 hours, and obtain a mixture of materials to prepare for the following steps, the ball mill having a speed of 600 r / min; and Step 6: placing the material mixture obtained in Step 5 in a vacuum drying cabinet for drying, and obtaining a final powder mixture, wherein the drying temperature is in the range of 60-120 ° C, drying takes 6-24 hours, and the degree of vacuum is not lower than 5x10 ° 3 Pa. 5. A method for producing a powder mixture for a diamond saw blade according to claim 4, characterized in that the atomization gas in the combined atomization of gas and water in step 2 is nitrogen. 6. A method for producing a powder mixture for a diamond saw blade according to claim 4, characterized in that the pre-alloyed powders which are produced after the atomization in step 2 are filtered by means of a 300-mesh sieve. 7. A method for producing a powder mixture for a diamond saw blade according to claim 4, characterized in that the oxygen content in the pre-alloyed powders which are produced after the atomization in step 2 is under control below 1000 ppm. 8. The method for producing a powder mixture for a diamond saw blade according to claim 4, characterized in that the method for producing the iron powder coated with cobalt in step 3 comprises the following sub-steps: S1: adding cobalt chloride hexahydrate, citric acid, hydrazine and a dispersant PEG a deionized material for complete dissolution, and adjusting the pH value to 13 by adding NaOH to produce an electroplating bath, the mass concentration of the cobalt chloride hexahydrate in the electroplating bath being 25 g / L, the concentration of citric acid 25 g / L is and the concentration of hydrazine is 0.8 mol / L; S2: Adding 500-mesh iron powders to the plating bath, and heating the solution in a water bath at 80 ° C for one hour, whereby a reacted plating bath is obtained, and while heating the mixture is continuously stirred, and the mass-to- Volume ratio between the iron powders and the electroplating bath is 15 g: 1 L; and S3: filtering and washing the reacted plating bath, placing the plating bath in a vacuum drying cabinet to dry, and obtaining iron powders coated with cobalt, the drying temperature being 90 ° C, drying taking 2 hours, and the degree of vacuum not lower than 5x10% Pa lies. 9. The method for producing a powder mixture for a diamond saw blade according to claim 4, characterized in that the method for producing the dispersing liquid of graphene oxide comprises the following sub-steps in step 4: S1: placing graphene oxide in anhydrous acetic acid, stirring the mixture using a magnetic stirrer for 10 minutes , and then obtaining a uniformly mixed mixed solution by supersonic vibration with heating at 80 ° C for one hour after stirring to prepare for the following steps, wherein the mass-to-volume ratio between the graphene oxide and the anhydrous acetic acid is 1 g: 500 mL is; and S2: Mixing the mixed solution obtained in S1 with acetone, and obtaining a dispersing liquid of graphene oxide by supersonic vibration with heating at 80 ° C for one hour, the volume ratio between the mixed solution and acetone being 1: 1.