CN114318163B - Superfine multi-element prealloy powder for diamond tool and preparation method thereof - Google Patents
Superfine multi-element prealloy powder for diamond tool and preparation method thereof Download PDFInfo
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Abstract
The invention discloses superfine multi-element pre-alloyed powder for a diamond tool, which consists of the following components in percentage by mass: copper: 10-30%, zinc: 20-40%, titanium: 2-6%, zirconium: 0.5 to 1.5%, boron: 0.005-0.025%, silicon: 0.4-2%, and the balance of iron and inevitable impurity elements; the invention also discloses a preparation method of the superfine multi-element prealloying powder, which comprises the steps of mixing the metal component raw materials, carrying out ball milling, melting and pouring all the materials, atomizing the materials into powder by using high-pressure water gas, reducing the powder by using mixed gas of hydrogen and nitrogen, preserving the heat at low temperature and screening. The superfine multi-element pre-alloyed powder prepared by the method disclosed by the invention is fine in grain size, uniform in alloy elements, easy to press and form, capable of reducing the sintering temperature, improving the mechanical strength of the alloy, high in density and hardness after sintering and capable of promoting the performance of a diamond tool.
Description
Technical Field
The invention belongs to the technical field of powder metallurgy, and particularly relates to superfine multi-element pre-alloy powder for a diamond tool and a preparation method thereof.
Background
Since the advent of synthetic diamonds, diamond tools have begun to be widely used in material processing and geological drilling. With the improvement of the requirements of drilling, stone and the like in China, the material processing is developed towards the direction of finish machining, and higher requirements are put forward on diamond tools. Because the existing artificial diamond is mainly in a fine particle shape, the diamond particles and matrix powder are generally mixed and sintered to be used. In diamond tools, where diamond is the cutting element, the matrix serves two primary functions: firstly, the diamond is dispersedly held by the matrix through mechanical embedding, metallurgical bonding and other modes, and meanwhile, the wear rate matched with a working object is provided to ensure the edge cutting rate of the diamond during working, so that the working efficiency is ensured; secondly, the heat dissipation effect, the temperature in the working area can be sharply increased due to grinding in the processing process, and the heat needs to be dispersed in time to avoid damaging the material. Therefore, whether the diamond can be fully and effectively utilized and plays a decisive role in the matrix, the performance of the matrix mainly depends on the material of the matrix, the embedding capacity, the cutting capacity, the heat dissipation capacity and other characteristics of the matrix material, and the processing efficiency and the service life of the diamond tool are directly determined.
At present, the carcass is mainly made of metal, resin and ceramic materials, wherein the metal carcass materials are widely applied with excellent comprehensive properties. The metal matrix mainly comprises components such as a framework material, a binder and the like, wherein the framework material mainly plays a supporting role in the matrix in the form of hard particles, and the binder is a main functional phase for consolidating and holding diamond abrasive particles to ensure the effect of diamond, and needs to be sintered, densified and alloyed at a higher temperature. In the traditional diamond tool industry, the binder uses simple substance mixed powder, which is beneficial to adjusting the proportion of the whole components of the tire body, but the sintering temperature is high, the powder surface is easy to oxidize, the material grains after sintering are relatively coarse, the tire body components are not uniform and are mostly pseudo-alloys. In order to further improve the mechanical properties of diamond tools and prolong the service life, the use of prealloyed powder as a binder has been studied. Compared with the mixing of simple substance metal powder, the adoption of pre-alloyed powder avoids the problems of specific gravity segregation, low-melting-point metal melting, enrichment, loss and the like. In the manufacturing of diamond tools, cobalt (Co) is an excellent binder metal, Co and common framework material tungsten carbide (WC) show complete wetting at 1500 ℃, the diamond embedding force is good, and Co has good alloying degree and mechanical property, so that the WC-Co-based diamond tool has good wear resistance, self-sharpening property and high-temperature performance, but the Co is expensive and has few resources, and the application of the Co is limited. Low Co or Co-free pre-alloyed powders are a research trend in the field of diamond articles.
Fe (Fe) and Co are in the same subgroup, the structure and many properties of Fe are similar to those of Co, Fe is rich in resource and low in price, but Fe-based binders are easy to bond and wear and easy to corrode diamonds, so that the sharpness of tools is influenced, and Fe-based binders are still in a development stage in diamond composite materials. The engineering application effect of the prealloyed powder depends on the performance characteristics determined by the microstructure of the sintered powder body. The prior document discloses that prealloy powder such as Fe-Ni-Cu, Fe-Ni-Cu-Sn, Fe-Cu-Co and the like is prepared, and a sintered matrix has higher bending strength, hardness and compactness. Based on the previous research of the applicant, the zinc (Zn) is added into the Fe-Cu-based pre-alloyed powder, so that the melting point of the alloy can be reduced, the homogenization and the alloying degree of the structure are improved, and the solid solution strengthening effect on the copper (Cu) in the alloy can be realized, but the strength and the wear resistance of the alloy can be reduced; although the Fe-Cu-Zn-based pre-alloy powder has uniform particle size distribution and can prevent the loss of Zn element in the subsequent sintering process, the problem of graphitization of diamond during high-temperature sintering is still not completely solved. At present, the technical difficulty existing in the research of Fe-based pre-alloyed powder is still how to improve the sintering activity of the Fe-based powder, and simultaneously, the problems of high-temperature oxidation and uneven components are solved, so that the diamond can be effectively wetted, and the graphitization on the surface of the diamond in the sintering process is reduced and avoided.
Disclosure of Invention
Based on the defects of the prior art, the invention aims to provide the superfine multi-element pre-alloyed powder for the diamond tool, which improves the utilization rate of zinc, reduces the sintering temperature of the superfine multi-element pre-alloyed powder, improves the mechanical strength after sintering and improves the holding force on diamond by multi-element combination; the invention also discloses a preparation method of the superfine multi-element prealloying powder for the diamond tool, which combines mechanical grinding and high-pressure water gas atomization to ensure component homogenization and granularity refinement.
In order to achieve the purpose, the invention adopts the technical scheme that:
an ultrafine multi-element prealloyed powder for a diamond tool, which comprises the following components in percentage by mass: copper (Cu): 10-30%, zinc (Zn): 20-40%, titanium (Ti): 2-6%, zirconium (Zr): 0.5 to 1.5%, boron (B): 0.005 to 0.025%, silicon (Si): 0.4-2%, and the balance of iron (Fe) and inevitable impurity elements.
Preferably, the superfine multi-element prealloyed powder for diamond tools consists of the following components in percentage by mass: copper: 10-20%, zinc: 25-30%, titanium 3-5%, zirconium: 0.5 to 1.5%, boron: 0.01 to 0.02%, silicon: 0.4-2%, and the balance of iron and inevitable impurity elements; wherein the mass ratio of iron to zinc is controlled to be 1: 0.4-0.6.
Further, ferroboron powder with boron content of 1-20 wt% is used as a boron raw material for the component boron, and ferrosilicon powder with silicon content of 40-80 wt% is used as a silicon raw material for the component silicon.
The preparation method of the superfine multi-element prealloying powder for the diamond tool comprises the following steps:
(1) preparing raw materials of each component, weighing the raw materials of each component according to the mass percentage, and preparing copper and zinc raw materials into copper-zinc alloy powder;
(2) under a protective atmosphere, mixing raw materials of iron, zirconium and titanium and the copper-zinc alloy powder obtained in the step (1), and performing ball milling for 2-4 hours to obtain intermediate alloy powder;
(3) heating the intermediate alloy powder obtained in the step (2) to be completely melted under a protective atmosphere, adding a boron raw material and a silicon raw material, heating to 1000-1200 ℃ at a speed of 3-10 ℃/min, stirring for 2-5 minutes, standing for 2-5 minutes under heat preservation, and removing slag to obtain an intermediate alloy liquid;
(4) and (3) heating the intermediate alloy liquid obtained in the step (3) to 1300-1500 ℃ for casting, atomizing the intermediate alloy liquid into powder by high-pressure water vapor, drying, reducing the powder for 3-5 hours at 400-500 ℃ in a hydrogen-nitrogen mixed atmosphere, preserving the heat for 2-3 hours at 200-300 ℃, cooling to room temperature, and screening to obtain the superfine multi-element pre-alloy powder with the granularity of 500-600 meshes.
Preferably, the preparation steps of the copper-zinc alloy powder in the step (1) are as follows: heating a copper raw material at 1000-1200 ℃ to be completely melted in a nitrogen atmosphere, adding a zinc raw material, then cooling to 800-900 ℃ at a speed of 3-10 ℃/min, stirring for 5-15 minutes, then keeping the temperature and standing for 2-5 minutes, and removing slag to obtain a copper-zinc alloy liquid; and heating the copper-zinc alloy liquid to 950-1050 ℃ for pouring, atomizing the copper-zinc alloy liquid into powder by high-pressure water vapor, drying the powder in a nitrogen atmosphere, and screening the powder to obtain the copper-zinc alloy.
Further, during high-pressure water gas atomization, the pouring speed of the copper-zinc alloy liquid is controlled to be 8-12 kg/min, the water pressure is 80-100 MPa, and the nitrogen flow is controlled to be 45-60L/min; the drying control temperature is 100-150 ℃, and the drying time is 2-4 hours.
Preferably, the ball-material ratio during ball milling in the step (2) is 8-20: 1, absolute ethyl alcohol is used as a grinding aid, the ball milling rotation speed is 300-600 r/min, and drying is carried out at 60-90 ℃ after ball milling.
Preferably, inert gas is used in the protective atmosphere in step (2) and step (3).
Preferably, in the step (4), during the high-pressure water atomization, the pouring speed of the master alloy liquid is controlled to be 8-12 kg/min, the water pressure is controlled to be 90-120 MPa, and the nitrogen flow is controlled to be 50-65L/min.
Preferably, the drying in the step (4) is performed in a hydrogen-nitrogen mixed atmosphere, the volume ratio of hydrogen to nitrogen in the hydrogen-nitrogen mixed atmosphere is 1: 3-6, the drying control temperature is 200-400 ℃, and the drying time is 1-2 hours.
Preferably, the volume ratio of the hydrogen to the nitrogen in the hydrogen-nitrogen mixed atmosphere in the step (4) is 3-6: 1.
The raw materials of the superfine multi-element pre-alloy powder and the equipment used in the preparation process are all common commercial products.
The invention introduces copper and zinc elements in the form of copper-zinc alloy, solves the problem of weak intersolubility of iron and copper, reduces the activation energy required by metal atom diffusion in the iron-based alloy, effectively improves the diffusion among powder particles and the migration rate among atoms at lower sintering temperature, and improves the organization uniformity of the iron-based alloy. Titanium is used as second phase particles to generate a dispersion strengthening effect and effectively improve the bending strength of the sintered body, in addition, titanium can form a carbide layer on the surface of diamond in the sintering process, and the introduction of the titanium element can improve the infiltration and the bonding of the prealloyed powder to the diamond. Zirconium can be in solid solution with other metals or nonmetals, and zirconium has the functions of degassing and grain refinement, promotes alloy sintering densification, and further ensures the strength of the iron-based alloy. The addition of trace boron can form metal boride, increase the hardness of the iron-based alloy, play a role in modification and refinement, inhibit excessive growth of hard phase particles, facilitate change of the form of a second phase on a crystal boundary, and improve the compactness and the wear resistance. The expansion coefficient of silicon is close to that of diamond, the volume effect is small when the cold and hot changes, the size is ensured, and the brittle fracture is avoided. Through multi-component combination, the superfine multi-component pre-alloyed powder has good brittleness and toughness at the same time, and is suitable for processing objects with hard texture and strong grinding performance.
The preparation method adopts a method of firstly performing mechanical ball milling and then performing water vapor atomization, so that the prealloy powder can be effectively refined, the ball milling enables the material to have larger surface energy and lattice distortion energy, and the diffusion of atoms, the solid solution of the alloy, the migration elimination of pores and the like can be promoted at lower temperature; the water-gas combined atomization ensures that the material has low oxygen content, fine granularity, good powder sphericity, larger specific surface area and high surface energy, so that the superfine multi-element pre-alloy powder can provide higher sintering driving force in a sintering state and is easy to generate micro-liquid phase sintering; reducing at high temperature (400-500 ℃) in a hydrogen-nitrogen mixed atmosphere, then preserving at low temperature (200-300 ℃), improving the texture, homogenizing the components, improving the processing performance, and finally obtaining a high-density, high-hardness and high-strength sintered block.
The grain size of the superfine multi-element pre-alloy powder prepared by the invention is less than 500 meshes, the refining of the pre-alloy powder can not only reduce the sintering temperature and ensure that the grain size of the matrix material is fine, the alloy elements are easier to homogenize, but also can better wet the diamond and avoid the damage of high-temperature sintering to the diamond; meanwhile, under the sintering condition of low pressure and short time, the diffusion depth is faster, higher density is easier to achieve, and the method also has a promoting effect on improving the performance of the diamond tool. The superfine multi-element pre-alloyed powder prepared by the method has irregular micro-morphology and narrow particle size distribution, and is easy to press and form; after sintering, the structure is uniform, the density is high (the relative density is more than 98%), and the hardness is 28-34 HRC.
Drawings
FIG. 1 is a scanning electron micrograph (200 times) of the ultrafine multi-element prealloyed powder of example 1;
FIG. 2 is a scanning electron micrograph (2000 times) of the ultrafine multi-element prealloyed powder of example 1.
Detailed Description
In order to make the technical purpose, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention are further described with reference to specific examples, which are intended to explain the present invention and are not to be construed as limiting the present invention, and those who do not specify a specific technique or condition in the examples follow the techniques or conditions described in the literature in the art or follow the product specification.
In the following examples, reduced iron powder was used as a raw material for the component iron, ferroboron powder having a boron content of 5 wt% was used as a boron raw material for the component boron, and ferrosilicon powder having a silicon content of 45 wt% was used as a silicon raw material for the component silicon, and the particle sizes were all about 300 mesh. The component copper adopts electrolytic copper powder as a raw material, the component zinc adopts gas atomized zinc powder, and the preparation steps of the copper-zinc alloy powder are as follows: heating a copper raw material at 1100 ℃ to be completely melted in a nitrogen atmosphere, adding a zinc raw material, then cooling to 850 ℃ at 4 ℃, stirring for 10 minutes, standing for 2 minutes at a constant temperature, and removing slag to obtain a copper-zinc alloy liquid; heating the copper-zinc alloy liquid to 1000 ℃ for pouring, atomizing the copper-zinc alloy liquid into powder by high-pressure water vapor, drying the powder for 2 hours at 150 ℃ in the nitrogen atmosphere, and sieving the powder by a 300-mesh sieve to obtain the copper-zinc alloy powder; and during the water vapor atomization, the pouring speed of the copper-zinc alloy liquid is controlled to be 10kg/min, the water pressure is 85MPa, and the nitrogen flow is controlled to be 55L/min.
Example 1
An ultrafine multi-element prealloyed powder for a diamond tool, which comprises the following components in percentage by mass: copper: 15%, zinc: 25%, titanium 5%, zirconium: 1.5%, boron: 0.01%, silicon: 1.5 percent, and the balance of iron and inevitable impurity elements.
The preparation method of the superfine multi-element prealloy powder for the diamond tool comprises the following steps:
(1) preparing raw materials of each component, weighing the raw materials of each component according to the mass percentage, and preparing copper and zinc raw materials into copper-zinc alloy powder;
(2) mixing iron, zirconium and titanium raw materials and the copper-zinc alloy powder obtained in the step (1) in an argon atmosphere, and performing ball milling for 2-4 hours to obtain intermediate alloy powder; ball-milling at a ball-material ratio of 10:1, using absolute ethyl alcohol as a grinding aid, performing ball-milling at a rotation speed of 400r/min, and drying at 80 ℃ after ball-milling;
(3) heating the intermediate alloy powder obtained in the step (2) at 900 ℃ to be completely melted in argon atmosphere, adding a boron raw material and a silicon raw material, heating to 1100 ℃ at 5 ℃, stirring for 3 minutes, keeping the temperature and standing for 2 minutes, and removing slag to obtain an intermediate alloy liquid;
(4) heating the intermediate alloy liquid obtained in the step (3) to 1350 ℃ for pouring (the pouring speed is 10kg/min), pouring into a tundish at the temperature of 750-850 ℃, and passing through the bottom of the tundish
The ceramic guide pipe flows out, under the protection of nitrogen (the flow is 60L/min), the ceramic guide pipe is smashed into powder through high-pressure water with the pressure of 95MPa, the powder naturally falls into cooling water for cooling, and then alloy powder with the water content of 10-15% is obtained through precipitation and solid-liquid separation; drying at 300 ℃ for 1 hour under the protection of mixed gas with the volume ratio of hydrogen to nitrogen of 1: 4; then placing the alloy powder into a steel belt type reduction furnace, wherein the thickness of the alloy powder is about 20mm, and reducing for 4 hours at 450 ℃ in a mixed atmosphere with the volume ratio of hydrogen to nitrogen being 5: 1; cooling to 250 deg.C, holding for 2 hr, cooling to room temperature, and sieving with 500 mesh sieve.
The superfine multi-element pre-alloyed powder prepared by the method is characterized by adopting a scanning electron microscope, and the result is shown in figures 1 and 2, the micro-morphology of the powder is irregular, the powder exists in the form of fine particle conglomerate, the particle size distribution is narrow, the powder is easy to be pressed and molded, and the powder has lower apparent density (1.81 g/cm) 3 ) The cold press molding of the follow-up tool bit is facilitated, and the sharpness of the diamond tool can be improved.
Example 2
An ultrafine multi-element prealloyed powder for a diamond tool, which comprises the following components in percentage by mass: copper: 15%, zinc: 25%, titanium 4%, zirconium: 1%, boron: 0.01%, silicon: 1.5 percent, and the balance of iron and inevitable impurity elements.
Example 3
An ultrafine multi-element prealloyed powder for a diamond tool, which comprises the following components in percentage by mass: copper: 10%, zinc: 30%, titanium 6%, zirconium: 1%, boron: 0.02%, silicon: 1% and the balance of iron and inevitable impurity elements.
Example 4
An ultrafine multi-element prealloyed powder for a diamond tool, which comprises the following components in percentage by mass: copper: 20%, zinc: 30%, titanium 3%, zirconium: 1%, boron: 0.02%, silicon: 1% and the balance of iron and inevitable impurity elements.
Comparative example 1
An ultrafine multi-element prealloyed powder for a diamond tool, which comprises the following components in percentage by mass: copper: 15%, zinc: 25%, titanium 5%, boron: 0.01%, silicon: 1.5 percent, and the balance of iron and inevitable impurity elements.
The difference compared to example 1 is that the composition does not contain zirconium.
Comparative example 2
An ultrafine multi-element prealloyed powder for a diamond tool, which comprises the following components in percentage by mass: copper: 15%, zinc: 25%, titanium 5%, zirconium: 1.5%, silicon: 1.5 percent, and the balance of iron and inevitable impurity elements.
The difference compared to example 1 is that no boron is present in the composition.
Examples 2-4 and comparative examples 1 and 2 were prepared according to the method of example 1.
Comparative example 3
Comparative example 3 an ultra-fine multi-component prealloyed powder was prepared according to the composition of example 1 except that step (2) was omitted from the preparation, i.e., after compounding, direct smelting without ball milling.
Pre-pressing the superfine multi-element pre-alloy powder prepared in the examples 1 to 4 and the comparative examples 1 to 3 at 20MPa for 3 minutes to obtain a pressed blank; the pressed blank is sintered for 5 minutes under the conditions of 50MPa and 750 ℃ by hot pressing in vacuum (the vacuum degree is maintained at 2 multiplied by 10) -2 Pa), cooling to room temperature to obtain a sintered blank; placing the sintered blank in a vacuum heating furnace, vacuumizing until the pressure in the furnace is less than 2 multiplied by 10 -2 Pa, heating to 450 ℃, keeping the constant temperature for 1 hour, stopping heating, taking out and cooling to room temperature after the temperature in the furnace is reduced to below 90 ℃, thus obtaining the sintered body.
Measuring the density of the sintered body by adopting a drainage method, and testing and calculating to obtain the relative density of the sintered body; the hardness of the sintered body was measured by an HRS-150 digital display rockwell hardness tester, and the bending strength of the sintered body was measured by a universal testing machine. The results of the performance parameters of the sintered superfine multi-element pre-alloy powder are shown in table 1.
TABLE 1 Properties of the ultrafine Multi-element Pre-alloyed powder after sintering
As can be seen from table 1, when zirconium is not contained in the composition, both the relative density and the flexural strength of the sintered body are significantly reduced, and when boron is not contained in the composition, the hardness of the sintered body is significantly reduced. The invention adopts the multiple combination and prepares the prealloy powder by a mechanical ball milling coupling water vapor atomization method, after sintering at 750 ℃, the relative density is more than 98 percent, the hardness is more than 28HRC, and simultaneously, the prealloy powder has better bending strength.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (9)
1. The superfine multi-element pre-alloyed powder for the diamond tool is characterized by comprising the following components in percentage by mass: copper: 10-30%, zinc: 20-40%, titanium: 2-6%, zirconium: 0.5 to 1.5%, boron: 0.005-0.025%, silicon: 0.4-2%, and the balance of iron and inevitable impurity elements;
the preparation method of the superfine multi-element prealloying powder comprises the following steps:
(1) preparing raw materials of each component, weighing the raw materials of each component according to the mass percentage, and preparing copper and zinc raw materials into copper-zinc alloy powder;
(2) under a protective atmosphere, mixing raw materials of iron, zirconium and titanium and the copper-zinc alloy powder obtained in the step (1), and performing ball milling for 2-4 hours to obtain intermediate alloy powder;
(3) heating the intermediate alloy powder obtained in the step (2) to be completely melted under a protective atmosphere, adding a boron raw material and a silicon raw material, heating to 1000-1200 ℃ at a speed of 3-10 ℃/min, stirring for 2-5 minutes, standing for 2-5 minutes under heat preservation, and removing slag to obtain an intermediate alloy liquid;
(4) and (4) heating the intermediate alloy liquid obtained in the step (3) to 1300-1500 ℃ for pouring, atomizing the intermediate alloy liquid into powder by high-pressure steam, drying, reducing the powder for 3-5 hours at 400-500 ℃ in a hydrogen-nitrogen mixed atmosphere, preserving the heat for 2-3 hours at 200-300 ℃, cooling to room temperature, and screening to obtain the superfine multi-element pre-alloy powder with the particle size of 500-600 meshes.
2. The ultra-fine multi-element prealloyed powder for diamond tools as defined in claim 1, wherein: the boron component adopts ferroboron powder with boron content of 1-20 wt% as a boron raw material, and the silicon component adopts ferrosilicon powder with silicon content of 40-80 wt% as a silicon raw material.
3. The ultra fine multi-element pre-alloyed powder for diamond tools according to claim 1, wherein the copper zinc alloy powder in the step (1) is prepared by the steps of: heating a copper raw material at 1000-1200 ℃ to be completely melted in a nitrogen atmosphere, adding a zinc raw material, then cooling to 800-900 ℃ at a speed of 3-10 ℃/min, stirring for 5-15 minutes, then keeping the temperature and standing for 2-5 minutes, and removing slag to obtain a copper-zinc alloy liquid; and heating the copper-zinc alloy liquid to 950-1050 ℃ for pouring, atomizing the copper-zinc alloy liquid into powder by high-pressure water vapor, drying the powder in a nitrogen atmosphere, and screening the powder to obtain the copper-zinc alloy.
4. The ultra-fine multi-element prealloyed powder for diamond tools as defined in claim 3 wherein: during high-pressure water gas atomization, the pouring speed of the copper-zinc alloy liquid is controlled to be 8-12 kg/min, the water pressure is 80-120 MPa, and the nitrogen flow is controlled to be 45-65L/min; the drying control temperature is 100-150 ℃, and the drying time is 2-4 hours.
5. The ultra-fine multi-element prealloyed powder for diamond tools as defined in claim 1 wherein: and (3) performing ball milling in the step (2) at a ball-material ratio of 8-20: 1, taking absolute ethyl alcohol as a grinding aid, performing ball milling at a rotating speed of 300-600 r/min, and drying at 60-90 ℃ after ball milling.
6. The ultra-fine multi-element prealloyed powder for diamond tools as defined in claim 1, wherein: and (3) adopting inert gas in the protective atmosphere in the steps (2) and (3).
7. The ultra-fine multi-element prealloyed powder for diamond tools as defined in claim 1, wherein: and (4) controlling the pouring speed of the intermediate alloy liquid to be 8-12 kg/min, the water pressure to be 90-120 MPa and the nitrogen flow to be 50-65L/min during high-pressure water gas atomization in the step (4).
8. The ultra-fine multi-element prealloyed powder for diamond tools as defined in claim 1, wherein: and (4) drying in a hydrogen-nitrogen mixed atmosphere, wherein the volume ratio of hydrogen to nitrogen in the hydrogen-nitrogen mixed atmosphere is 1: 3-6, the drying control temperature is 200-400 ℃, and the drying time is 1-2 hours.
9. The ultra-fine multi-element prealloyed powder for diamond tools as defined in claim 1, wherein: and (4) the volume ratio of hydrogen to nitrogen in the hydrogen-nitrogen mixed atmosphere in the step (4) is 3-6: 1.
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