CN111168591B - Diamond grinding tool and preparation method thereof - Google Patents

Diamond grinding tool and preparation method thereof Download PDF

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CN111168591B
CN111168591B CN202010052523.6A CN202010052523A CN111168591B CN 111168591 B CN111168591 B CN 111168591B CN 202010052523 A CN202010052523 A CN 202010052523A CN 111168591 B CN111168591 B CN 111168591B
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powder
amorphous alloy
diamond
grinding tool
temperature amorphous
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CN111168591A (en
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谢盛辉
涂先猛
廖相
曾燮榕
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Shenzhen University
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Shenzhen University
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
    • B24D18/00—Manufacture of grinding tools or other grinding devices, e.g. wheels, not otherwise provided for
    • B24D18/0009—Manufacture of grinding tools or other grinding devices, e.g. wheels, not otherwise provided for using moulds or presses

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Abstract

The invention belongs to the technical field of manufacturing of diamond grinding tools, and particularly relates to a diamond grinding tool and a preparation method thereof, wherein the preparation method of the diamond grinding tool comprises the following steps: providing Ir-Ni-Ta- (B) high-temperature amorphous alloy powder, MBD diamond powder and metal bond powder; uniformly mixing Ir-Ni-Ta- (B) high-temperature amorphous alloy powder, MBD diamond powder and metal bond powder together to obtain diamond grinding tool powder; and filling the diamond grinding tool powder into a forming die, and forming by ultrasonic vibration under certain pressure to obtain the diamond grinding tool. Under the action of ultrasonic vibration and pressure, a large amount of friction heat is instantaneously generated at the powder interface, so that the instantaneous temperature of the interface is instantaneously raised, the atom flow and diffusion at the powder interface are promoted, and the plastic rheology is easily generated at the interface of the high-temperature amorphous alloy and the crystal so that the powder interface achieves metallurgical bonding, thereby enhancing the bonding force between the diamond and the metal interface and greatly improving the holding force of the diamond grinding tool.

Description

Diamond grinding tool and preparation method thereof
Technical Field
The invention belongs to the technical field of manufacturing of diamond grinding tools, and particularly relates to a diamond grinding tool and a manufacturing method thereof.
Background
At present, technical reports of high-speed grinding of superhard materials such as hard alloy, tungsten alloy or ceramics with hardness of more than 90HRA are few, and diamond grinding tools are formed by adopting a powder metallurgy mode at present and can be divided into three types according to bonding agents, namely resin bonding agent diamond grinding tools, metal bonding agent diamond grinding tools and ceramic bonding agent diamond grinding tools. The three bonding agent diamond grinding tools are respectively good and bad, and the resin bonding agent diamond grinding tool is not high enough in hardness and high temperature resistant, so that the resin bonding agent is quickly worn by being heated and is difficult to grind due to the fact that the superhard ceramic is ground and processed at high speed, and the hardness is not enough. Although ceramic has high hardness and is suitable for grinding, the ceramic bond diamond grinding tool is often insufficient in binding force between the ceramic bond and the diamond, that is, insufficient in holding force. Meanwhile, the development of the ceramic bond diamond grinding tool is greatly limited by the contradiction that the temperature is usually higher in the sintering process of the ceramic bond, usually higher than 800 ℃ for sintering, the temperature can reach more than one thousand degrees, and the oxidation performance of diamond is easy to deteriorate above 800 ℃. For the metal bond diamond grinding tool, the main problem is to improve the bonding force (holding force) between metal and diamond grinding material, and the main theory for improving the holding force is to select metal material with high wettability to diamond, so that the metal material can be well bonded with the metal interface in the sintering process, and the interface bonding force of the metal material is enhanced. Secondly, the metal bond diamond grinding tool has poor self-sharpening performance in the use process, and the grinding efficiency is influenced.
In order to improve the holding force of the metal bond diamond grinding tool, research is currently focused on processes such as vacuum micro-evaporation, electroplating and the like, so that metal is enriched on the surface of the diamond grinding tool, and then sintering molding is performed. Although the process is beneficial to improving the holding force of the metal bond diamond grinding tool, the process is complicated, the control of the uniformity of a surface coating is very difficult, the energy consumption is high, and the like, so that the industrial application of the process is greatly limited.
In addition, the diamond grinding superhard material needs to be cooled by cooling liquid due to the fact that the rotating speed is high in the grinding process, the performance of a common diamond grinding tool is greatly reduced even cannot be used at all when the temperature is higher than 500 ℃, at present, the diamond grinding tool is less in high-temperature condition application report, and in few cases, grinding and trimming of the superhard material in the service process are inconvenient for the use of the cooling liquid, so that the diamond grinding tool for grinding the superhard material under the high-temperature condition has a certain development space. The grinding efficiency is directly related to the rotating speed of the motor during grinding, and the higher the rotating speed of the motor is, the higher the grinding efficiency is. At present, the magnetic suspension motor is gradually applied in various industries, the rotating speed of the magnetic suspension motor is greatly improved, and the limit rotating speed can reach 4 ten thousand revolutions per minute. Therefore, when the magnetic suspension motor is applied to the diamond grinding tool, the diamond grinding tool used under the high-temperature condition can meet the use condition of the diamond grinding tool.
The existing diamond grinding tool mainly has the following defects:
1. the problems that when the superhard material is processed, for example, the superhard ceramic with the holding force of more than 90HRA is not enough, the edge is easy to break, fall off and the abrasion is too fast are solved.
2. Its hardness is not sufficient and the grinding of superhard materials, such as superhard ceramics above 90HRA, is too rapid. Because the hardness of the bonding agent is far lower than that of diamond and much lower than that of 90HRA, the hardness value of the grinding tool is often insufficient after the diamond and the general bonding agent are compounded, sintered and molded, and the grinding tool is worn too fast when grinding the superhard ceramic of 90 HRA.
3. At present, the service performance of the diamond grinding tool is greatly reduced under the high-temperature condition, and when the diamond grinding tool is used for high-speed grinding under the action of higher load, although the production efficiency is improved, the loss of the diamond grinding tool is larger. The specific expression is that the diamond grinding tool has high heat generation during grinding, the mechanical property of the matrix material is reduced, and the softening is accelerated, so that the matrix material is abraded too fast. The binding force between the diamond particles and the matrix material is insufficient, and the falling is rapid.
In the prior technical scheme, the formed diamond grinding tool is generally sintered by hot pressing, the sintering temperature is high (650-1100 ℃), and the energy consumption is high. To enhance the holding force of diamond grinding tools, diamond surface plating is often used. The diamond surface plating means that one metal or a plurality of metals are deposited, spread or coated on the surface of the diamond abrasive material in the form of a metal film layer by a physical or chemical method by means of a certain special process or equipment, so as to achieve the purpose of changing the physical and chemical properties and the form of the surface of the diamond abrasive material. The method for plating the surface of the diamond abrasive material is mainly as follows: wet plating, vacuum physical vapor deposition, vacuum chemical vapor deposition, vacuum micro-evaporation plating, powder coating sintering, salt bath. The holding force is enhanced by plating the surface of the diamond, so that the forming process of the diamond grinding tool is complicated, and the energy consumption is increased.
Disclosure of Invention
The invention aims to provide a diamond grinding tool and a preparation method thereof, and aims to solve the technical problems of low holding force, excessive wear and no high temperature resistance of the diamond grinding tool in the prior art.
In order to achieve the purpose, the invention adopts the technical scheme that: a method for preparing a diamond grinding tool comprises the following steps:
providing Ir-Ni-Ta- (B) high-temperature amorphous alloy powder, MBD diamond powder and metal bond powder; uniformly mixing the Ir-Ni-Ta- (B) high-temperature amorphous alloy powder, the MBD diamond powder and the metal bond powder together to obtain diamond grinding tool powder;
and filling the diamond grinding tool powder into a forming die, and forming by ultrasonic vibration under certain pressure to obtain the diamond grinding tool.
Alternatively, the ultrasonic vibration molding operation is performed at normal temperature.
Optionally, after the diamond powder is filled into a forming die, the forming die and the diamond powder are heated to 200-550 ℃, and after heat preservation for a period of time, the ultrasonic vibration forming operation is performed.
Optionally, the Ir-Ni-Ta- (B) high-temperature amorphous alloy powder is prepared by the following method:
providing a raw material for preparing Ir-Ni-Ta- (B) high-temperature amorphous alloy, and putting the raw material into an electric arc melting furnace for melting under the protection atmosphere of argon to obtain Ir-Ni-Ta- (B) high-temperature amorphous alloy master alloy;
mechanically crushing the Ir-Ni-Ta- (B) high-temperature amorphous alloy master alloy, putting the Ir-Ni-Ta- (B) high-temperature amorphous alloy master alloy into a copper roller belt throwing machine, heating the Ir-Ni-Ta- (B) high-temperature amorphous alloy master alloy to a molten state, throwing the Ir-Ni-Ta- (B) high-temperature amorphous alloy melt out by using a rotating copper roller, cooling and solidifying the Ir-Ni-Ta- (B) high-temperature amorphous alloy master alloy melt to obtain an Ir-Ni-Ta- (;
and shearing the Ir-Ni-Ta- (B) high-temperature amorphous alloy strip, grinding the Ir-Ni-Ta- (B) high-temperature amorphous alloy strip in a ball mill, and sieving the Ir-Ni-Ta- (B) high-temperature amorphous alloy strip after grinding is finished to obtain Ir-Ni-Ta- (B) high-temperature amorphous alloy powder.
Optionally, the Ir-Ni-Ta- (B) high-temperature amorphous alloy powder is IrxNiyTazBkPowder, wherein the numerical range of x is 20-35%, the numerical range of y is 20-40%, the numerical range of z is 35-40%, the numerical range of k is 0-5%, and the following relational expression is satisfied: x + y + z + k is 100.
Optionally, the metal bond powder includes a first metal powder selected from at least one of Cu powder and CuSn powder, a second metal powder selected from at least one of Fe powder and Co powder, and graphite powder.
Optionally, the weight ratio of the Ir-Ni-Ta- (B) high temperature amorphous alloy powder, the MBD diamond powder, the first metal powder, the second metal powder and the graphite powder is (30-60): (15-45): (10-30): (3-7): (3-7).
Alternatively, the first metal powder has a particle size ranging from 10 μ to 30 μ, the second metal powder has a particle size ranging from 10 μ to 30 μ, and the graphite powder has a particle size ranging from 5 μ to 20 μ. Optionally, the MBD diamond powder has a particle size ranging from 10 mu to 60 mu, and the Ir-Ni-Ta- (B) high-temperature amorphous alloy powder has a particle size ranging from 20 mu to 40 mu.
One or more technical schemes in the preparation method of the diamond grinding tool provided by the invention have at least one of the following technical effects: under the action of ultrasonic vibration and pressure, a large amount of friction heat is instantaneously generated at the powder interface, the interface temperature is instantaneously raised by the friction heat, so that atom flowing and diffusion at the powder interface are promoted, the interface achieves metallurgical bonding, the bonding between the powders is tighter, and the bonding force among the Ir-Ni-Ta- (B) high-temperature amorphous alloy powder, the MBD diamond powder and the metal bond powder is increased, so that the holding force of the diamond grinding tool can be greatly improved.
The invention adopts another technical scheme that: a diamond grinding tool prepared by the method.
When the diamond grinding tool is manufactured, under the action of the vibration and pressure of ultrasonic waves, a large amount of friction heat is instantly generated at the powder interface, the interface temperature is instantly increased by the friction heat, so that the atom flow and diffusion at the powder interface are promoted, the interface is metallurgically bonded, the bonding between the powders is tighter, and the bonding force among the Ir-Ni-Ta- (B) high-temperature amorphous alloy powder, the MBD diamond powder and the metal bond powder is increased, so that the holding force of the diamond grinding tool can be greatly improved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
Fig. 1 is a schematic flow chart of a method for manufacturing a diamond abrasive tool according to an embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
In one embodiment of the present invention, as shown in fig. 1, there is provided a method for manufacturing a diamond abrasive tool, comprising the steps of:
providing Ir-Ni-Ta- (B) high-temperature amorphous alloy powder, MBD diamond powder and metal bond powder; uniformly mixing the Ir-Ni-Ta- (B) high-temperature amorphous alloy powder, the MBD diamond powder and the metal bond powder together to obtain diamond grinding tool powder;
and filling the diamond powder into a forming die, and then carrying out ultrasonic vibration forming to obtain the diamond grinding tool.
Specifically, according to the preparation method of the diamond grinding tool provided by the embodiment of the invention, under the action of ultrasonic vibration and pressure, a large amount of friction heat is instantaneously generated at the powder interface, and the interface temperature is instantaneously raised (the powder can be heated to 300-450 ℃ by specific ultrasonic vibration molding), so that atom flowing and diffusion at the powder interface are promoted, the interface is metallurgically bonded, the bonding between the powders is tighter, the bonding force among the Ir-Ni-Ta- (B) high-temperature amorphous alloy powder, the MBD diamond powder and the metal bond powder is increased, and the holding force of the diamond grinding tool can be greatly improved.
In the embodiment, when the diamond grinding tool is ground at a high pressure and a high speed or a workpiece is processed in a high-temperature environment, compared with a conventional crystalline metal bond diamond grinding tool, the diamond grinding tool manufactured by the method for manufacturing the diamond grinding tool according to the embodiment of the invention has the advantages that the addition of the Ir-Ni-Ta- (B) high-temperature amorphous alloy powder ensures that the diamond grinding tool still has high holding force and other properties when working at a temperature below 800 ℃, and the service life of the diamond grinding tool is prolonged, mainly because the Ir-Ni-Ta- (B) high-temperature amorphous alloy is still in an amorphous state at a temperature below 800 ℃, and the high strength and the high hardness of the amorphous Ir-Ni-Ta- (B) high-temperature amorphous alloy are utilized.
In this example, the Ir-Ni-Ta- (B) high temperature amorphous alloy powder means one or more powder materials contained in an Ir-Ni-Ta- (B) high temperature amorphous alloy system.
In the present example, the diamond grinding tool made of Ir-Ni-Ta- (B) high temperature amorphous alloy was compared with the conventional diamond grinding tool made of Zr-based amorphous alloy powder, the two methods are different essentially, when the diamond grinding tool made of Zr-based amorphous alloy powder is manufactured, the Zr-based amorphous alloy needs to be crystallized, the holding force of the diamond grinding tool is improved by utilizing the crystallized Zr-based amorphous alloy, when the diamond grinding tool made of Ir-Ni-Ta- (B) high-temperature amorphous alloy is manufactured, the Ir-Ni-Ta- (B) high-temperature amorphous alloy is in an amorphous state by utilizing ultrasonic vibration, and the holding force of the diamond grinding tool is improved by utilizing the high strength and the high hardness of the amorphous Ir-Ni-Ta- (B) high-temperature amorphous alloy; in addition, the Zr-based amorphous alloy has lower use temperature and is generally crystallized during processing and consolidation, at the moment, the Zr-based amorphous alloy does not belong to an amorphous material, but Ir-Ni-Ta- (B) high-temperature amorphous alloy still belongs to an amorphous material after processing and consolidation.
In this embodiment, the ultrasonic vibration molding machine with a large power may be used, the power of the ultrasonic vibration molding machine is 1K W-10 KW, the vibration frequency is 20KHz, the vibration molding time is 0.2 s-10 s, and the pressure during molding is 100N-1000N.
Further, it should be noted that the mold used can be made of heat-resistant steel, mold steel or graphite, wherein the graphite exterior still needs to be fastened by steel mold.
In another embodiment of the present invention, as shown in fig. 1, there is provided a method of manufacturing the diamond abrasive tool, in which the ultrasonic vibration molding operation is performed at a normal temperature. Specifically, compared with the conventional method for forming the diamond grinding tool, which needs to be heated to 650-1100 ℃, the temperature is kept for a period of time, and even the plating process needs to be carried out on the surface of the diamond, the diamond grinding tool can be formed at room temperature, the energy consumption for manufacturing is greatly reduced, meanwhile, the forming time is extremely short, the production and preparation efficiency is greatly improved, and the forming process is simple. The ultrasonic vibration operation is carried out at normal temperature, and an ultrasonic vibration molding machine with higher power needs to be selected.
In another embodiment of the present invention, as shown in fig. 1, the diamond powder is filled into a forming mold, the forming mold is heated to 200 to 500 ℃, and after a certain period of heat preservation, the ultrasonic vibration forming operation is performed. Specifically, when the ultrasonic wave is vibrated, the energy generated by the ultrasonic wave and the heat absorbed by the heating of the molding abrasive, the Ir-Ni-Ta- (B) high-temperature amorphous alloy powder can reach an overcooling liquid phase region, the viscosity of the Ir-Ni-Ta- (B) high-temperature amorphous alloy is sharply reduced, the surface of the Ir-Ni-Ta- (B) high-temperature amorphous alloy generates plastic flow, the Ir-Ni-Ta- (B) high-temperature amorphous alloy powder enhances the wetting of the surface of the diamond, can greatly improve the bonding capability of Ir-Ni-Ta- (B) high-temperature amorphous alloy and MBD diamond, so that the Ir-Ni-Ta- (B) high-temperature amorphous alloy can be well combined with the MBD diamond, and the holding force of the diamond grinding tool is further improved. More specifically, the heating temperature of the forming die can be 200 ℃, 300 ℃, 400 ℃, 500 ℃ or 550 ℃, the temperature is lower than that of the existing heating stability, and when the forming die is combined with the subsequent ultrasonic vibration forming operation, the ultrasonic vibration forming machine with lower power can be selected in the step of heating the forming die and then carrying out ultrasonic vibration forming, so that the energy consumption is greatly reduced.
Furthermore, it should be noted that the supercooled liquid region is a temperature range, specifically, a temperature range above the glass transition Tg temperature and below the crystallization temperature of the amorphous alloy.
In the embodiment, the diamond grinding tool prepared by the preparation method of the diamond grinding tool of the embodiment of the invention is suitable for processing hard alloy, tungsten alloy or ceramics and other superhard materials with the hardness of more than 90HRA, when Ir-Ni-Ta- (B) high-temperature amorphous alloy powder is heated by ultrasonic vibration and heat absorbed by a forming grinding tool, the temperature of the Ir-Ni-Ta- (B) high-temperature amorphous alloy powder can be increased more quickly, the time required for increasing the temperature to the supercooled liquid region of the Ir-Ni-Ta- (B) high-temperature amorphous alloy powder is short, the time for forming by ultrasonic vibration is short, the formed diamond grinding tool is quickly cooled to room temperature, the Ir-Ni-Ta- (B) high-temperature amorphous alloy powder is not ready for crystallization, and the excellent mechanical properties of the Ir-Ni-Ta- (B) high-temperature amorphous alloy can be reserved, the diamond grinding tool has the advantages of extremely high strength, better toughness, excellent wear resistance and corrosion resistance and higher hardness, thereby greatly prolonging the service life of the diamond grinding tool; the mechanical properties such as high strength and hardness ensure the abrasion resistance of the matrix of the diamond grinding tool, especially the excellent mechanical properties at high temperature, ensure the service life of the diamond grinding tool under the action of high speed and large pressure, ensure the high temperature resistance of the diamond grinding tool, and in addition, the amorphous alloy has better self-sharpening property, has excellent performance as the matrix of the diamond grinding tool and is suitable for grinding superhard materials.
In another embodiment of the invention, the Ir-Ni-Ta- (B) high temperature amorphous alloy powder of the method for preparing the diamond grinding tool is prepared by the following method:
providing raw materials for preparing Ir-Ni-Ta- (B) high-temperature amorphous alloy, and putting the raw materials into an electric arc melting furnace for melting to obtain Ir-Ni-Ta- (B) high-temperature amorphous alloy master alloy;
mechanically crushing the Ir-Ni-Ta- (B) high-temperature amorphous alloy master alloy, putting the Ir-Ni-Ta- (B) high-temperature amorphous alloy master alloy into a copper roller melt spinning machine, heating the Ir-Ni-Ta- (B) high-temperature amorphous alloy master alloy to a molten state, and spinning the Ir-Ni-Ta- (B) high-temperature amorphous alloy master alloy melt by using a rotating copper roller to rapidly cool the Ir-Ni-Ta- (B) high-temperature amorphous alloy master alloy melt spinning machine to obtain an Ir-Ni-Ta- (B) high-temperature amorphous alloy strip;
and shearing the Ir-Ni-Ta- (B) high-temperature amorphous alloy belt, grinding the Ir-Ni-Ta- (B) high-temperature amorphous alloy belt in a ball mill, and sieving the ground Ir-Ni-Ta- (B) high-temperature amorphous alloy belt to obtain Ir-Ni-Ta- (B) high-temperature amorphous alloy powder.
Specifically, firstly, selecting raw materials for preparing Ir-Ni-Ta- (B) high-temperature amorphous alloy, wherein the raw materials comprise various components of metals Ir, Ni, Ta and nonmetal B with the purity of more than 99.9%, weighing according to specific atomic percentage, and putting into an electric arc melting furnace for melting uniformly to form Ir-Ni-Ta- (B) high-temperature amorphous alloy master alloy. And mechanically crushing the Ir-Ni-Ta- (B) high-temperature amorphous alloy master alloy, putting the Ir-Ni-Ta- (B) high-temperature amorphous alloy master alloy into a copper roller melt spinning machine for melt spinning to form an Ir-Ni-Ta- (B) high-temperature amorphous alloy strip, cutting the Ir-Ni-Ta- (B) high-temperature amorphous alloy strip into pieces, and putting the Ir-Ni-Ta- (B) high-temperature amorphous alloy strip into a ball mill for ball milling to prepare Ir-Ni-Ta- (B) high-temperature amorphous alloy powder. The powder preparation method is simple and convenient to operate. Of course, in other embodiments, the Ir-Ni-Ta- (B) high temperature amorphous alloy powder may also be obtained by other pulverization methods, such as: ultrasonic atomization powder preparation, vibration ball milling, vibration milling, stirring milling, colloid milling and the like.
In another embodiment of the invention, the Ir-Ni-Ta- (B) high-temperature amorphous alloy powder of the preparation method of the diamond grinding tool is IrxNiyTazBkPowder, wherein the numerical range of x is 20-35%, the numerical range of y is 20-40%, the numerical range of z is 35-40%, the numerical range of k is 0-5%, and the following relational expression is satisfied: x + y + z + k is 100. Specifically, the Ir-Ni-Ta- (B) high-temperature amorphous alloy powder can be Ir35Ni20Ta40B5Powder, Ir35Ni20Ta40Powder, Ir33Ni28Ta39Powder, Ir30Ni30Ta40Powder, Ir25Ni35Ta40Powder, Ir25Ni40Ta35Powder or Ir25Ni40Ta40The powder is located in an Ir-Ni-Ta- (B) high-temperature amorphous alloy system, and the amorphous alloy in the Ir-Ni-Ta- (B) high-temperature amorphous alloy system within the range has high glass transition temperature, a large supercooling liquid phase region, a low thermal expansion coefficient, relatively high resistance, high-temperature hardness and strong corrosion resistance, so that the holding force, the strength and the hardness of the diamond grinding tool are greatly improved. Of course, other metal powders in the Ir-Ni-Ta- (B) high-temperature amorphous alloy system can be selected according to actual needs.
More specifically, the parameters of the Ir-Ni-Ta- (B) high-temperature amorphous alloy are as follows, Ir35Ni25Ta40Glass transition temperature T ofgAt 889 c, is the highest glass transition temperature amorphous alloy known at present. The addition of B element slightly lowers the glass transition temperature to 874 ℃. Ir35Ni20Ta40B5The supercooled liquid region of (a) was 136 ℃. Ir35Ni25Ta40The room temperature strength of the nano-indentation testing is 5.1GPa, the nano-indentation testing can still maintain 3.7GPa at 767 ℃, the room temperature hardness of the nano-indentation testing is 15GPa, the Young modulus E is 263GPa, and the linear thermal expansion coefficient is 8.6 multiplied by 10 when the testing result is lower than 557 DEG C-6K-1Above 557 deg.C, it was found to be 6.5X 10-6K-1The high-temperature oxidation resistance can resist the high temperature of 800 ℃, and the alloy has high corrosion resistance under the corrosion conditions of strong acid, strong alkali, aqua regia and the like, according to the experimental result, 304 stainless steel, Zr-based amorphous alloy and iron-based amorphous alloy are corroded within 1 hour after being soaked in the aqua regia, but the Ir-Ni-Ta high-temperature amorphous alloy in a complete glass state cannot be corroded after being soaked in the aqua regia for 112 days.
Further, Ir is35Ni20Ta40B5Powder, Ir35Ni20Ta40Powder, Ir33Ni28Ta39Powder, Ir30Ni30Ta40Powder, Ir25Ni35Ta40Powder, Ir25Ni40Ta35Powder or Ir25Ni40Ta40The numerical subscripts in the powder represent atomic percent.
In another embodiment of the present invention, the metal bond powder of the method for manufacturing a diamond grinding tool includes a first metal powder, a second metal powder and graphite powder, wherein the first metal powder is at least one selected from Cu powder and CuSn powder, and the second metal powder is at least one selected from Fe powder and Co powder. Specifically, the Cu powder or the CuSn powder mainly buffers the impact force of ultrasonic vibration, so that the diamond grinding tool is uniformly stressed in the ultrasonic vibration bonding process, heat conduction is facilitated, the bonded diamond grinding tool is uniform in performance, and meanwhile, the Cu powder and the CuSn powder are softened firstly during ultrasonic vibration, so that Ir-Ni-Ta- (B) high-temperature amorphous alloy and the MBD diamond are bonded together stably, and the holding force of the obtained diamond grinding tool is better; specifically, when the diamond grinding tool is used at high temperature, Cu powder is selected; when the alloy is used at low temperature, Cu-Sn alloy powder is selected; the Fe powder and the Co powder are beneficial to increasing the holding force of the diamond grinding tool; the graphite powder is beneficial to playing the roles of lubrication and chip removal in the grinding process.
In the present embodiment, the first metal powder may be a Cu powder, a CuSn powder, or a mixed powder in which a Cu powder and a CuSn powder are mixed.
In this embodiment, the second metal powder may be Fe powder, Co powder, or a mixed powder in which Fe powder and Co powder are mixed.
In another embodiment of the present invention, the weight ratio of the Ir-Ni-Ta- (B) high temperature amorphous alloy powder, the MBD diamond powder, the first metal powder, the second metal powder, and the graphite powder of the method for manufacturing a diamond grinding tool is (30 to 60): (15-45): (10-30): (3-7): (3-7). Specifically, in the proportion configuration, the Ir-Ni-Ta- (B) high-temperature amorphous alloy powder and the diamond powder have high mass, and the diamond content with high proportion is realized, so that the prepared diamond grinding tool has high strength and hardness, is favorable for processing high-hardness workpieces such as ceramics, hard alloys and the like, and greatly prolongs the service life and improves the use effect of the diamond grinding tool.
Preferably, the weight ratio of the Ir-Ni-Ta- (B) high temperature amorphous alloy powder, the MBD diamond powder, the first metal powder, the second metal powder and the graphite powder is 40: 30: 20: 5: 5.
in another embodiment of the present invention, there is provided a method of manufacturing the diamond abrasive tool, wherein the first metal powder has a particle size ranging from 10 μ to 30 μ, the second metal powder has a particle size ranging from 10 μ to 30 μ, and the graphite powder has a particle size ranging from 5 μ to 20 μ. Specifically, the particle size of the first metal powder may be 10 μ, 20 μ or 30 μ, the particle size of the second metal powder is 10 μ, 20 μ or 30 μ, the particle size of the graphite powder is 5 μ, 10 μ, 15 μ or 20 μ, the particle size of the first metal powder, the particle size of the second metal powder and the particle size of the graphite powder are respectively located in corresponding particle size ranges, the sizes of the powders are suitable, so that the powders are mixed more uniformly, the diamond grinding tool obtained after bonding molding has higher hardness and larger holding force, processing difficulty caused by too small powder particle size is avoided, processing cost is high, and poor interface bonding during molding caused by too large gaps between the powders and insufficient holding force of the diamond grinding tool can also be avoided.
In another embodiment of the invention, the MBD diamond powder in the preparation method of the diamond grinding tool has a particle size range of 10 mu to 60 mu, and the Ir-Ni-Ta- (B) high-temperature amorphous alloy powder has a particle size range of 20 mu to 40 mu. Specifically, the particle size of the MBD diamond powder may be 10 μ, 20 μ, 30 μ, 40 μ, 50 μ or 60 μ, the particle size of the Ir-Ni-Ta- (B) high-temperature amorphous alloy powder may be 20 μ, 30 μ or 40 μ, the particle size of the MBD diamond powder and the particle size of the Ir-Ni-Ta- (B) high-temperature amorphous alloy powder are respectively in the corresponding particle size ranges, the sizes of the powders are suitable, so that the powders are uniformly and more mixed, the diamond grinding tool bonded by molding has higher strength and hardness, the difficulty in processing due to too small particle size of the powders is avoided, the processing cost is high, and the diamond grinding tool formed after bonding together due to too large particle size of the powders does not have higher holding force.
In another embodiment of the invention, a diamond abrasive article made by the above method is provided.
Specifically, during manufacturing of the diamond grinding tool of the embodiment of the invention, under the action of ultrasonic vibration and pressure, a large amount of friction heat is instantaneously generated at the powder interface of Ir-Ni-Ta- (B) high-temperature amorphous alloy powder, MBD diamond powder and metal bond powder, and the friction heat instantaneously raises the interface temperature, so that atom flow and diffusion at the powder interface are promoted, the interface is metallurgically bonded, the bonding between the powders is tighter, and the bonding force among the Ir-Ni-Ta- (B) high-temperature amorphous alloy powder, the MBD diamond powder and the metal bond powder is increased, so that the holding force of the diamond grinding tool can be greatly improved.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.

Claims (8)

1. The preparation method of the diamond grinding tool is characterized by comprising the following steps:
providing Ir-Ni-Ta- (B) high-temperature amorphous alloy powder, MBD diamond powder and metal bond powder; uniformly mixing the Ir-Ni-Ta- (B) high-temperature amorphous alloy powder, the MBD diamond powder and the metal bond powder together to obtain diamond grinding tool powder;
filling the diamond grinding tool powder into a forming die, heating the forming die and the diamond grinding tool powder to 200-550 ℃, preserving heat for a period of time, then carrying out ultrasonic vibration forming operation, and obtaining the diamond grinding tool under the action of ultrasonic vibration and pressure, wherein the pressure during forming is 100-1000N.
2. The method of manufacturing a diamond abrasive tool according to claim 1, wherein: the Ir-Ni-Ta- (B) high-temperature amorphous alloy powder is prepared by the following method:
providing a raw material for preparing Ir-Ni-Ta- (B) high-temperature amorphous alloy, and putting the raw material into an electric arc melting furnace for melting under the protection atmosphere of argon to obtain Ir-Ni-Ta- (B) high-temperature amorphous alloy master alloy;
mechanically crushing the Ir-Ni-Ta- (B) high-temperature amorphous alloy master alloy, putting the Ir-Ni-Ta- (B) high-temperature amorphous alloy master alloy into a copper roller belt throwing machine, heating the Ir-Ni-Ta- (B) high-temperature amorphous alloy master alloy to a molten state, throwing the Ir-Ni-Ta- (B) high-temperature amorphous alloy melt out by using a rotating copper roller, cooling and solidifying the Ir-Ni-Ta- (B) high-temperature amorphous alloy master alloy melt to obtain an Ir-Ni-Ta- (B) high-temperature amorphous alloy belt;
and shearing the Ir-Ni-Ta- (B) high-temperature amorphous alloy strip, grinding the Ir-Ni-Ta- (B) high-temperature amorphous alloy strip in a ball mill, and sieving the Ir-Ni-Ta- (B) high-temperature amorphous alloy strip after grinding is finished to obtain Ir-Ni-Ta- (B) high-temperature amorphous alloy powder.
3. The method of manufacturing a diamond abrasive tool according to claim 1 or 2, characterized in that: the Ir-Ni-Ta- (B) high-temperature amorphous alloy powder is IrxNiyTazBkPowder, wherein the numerical range of x is 20-35%, the numerical range of y is 20-40%, the numerical range of z is 35-40%, the numerical range of k is 0-5%, and the following relational expression is satisfied: x + y + z + k is 100.
4. The method of manufacturing a diamond abrasive tool according to claim 1 or 2, characterized in that: the metal bond powder comprises a first metal powder, a second metal powder and graphite powder, wherein the first metal powder is selected from at least one of Cu powder and CuSn powder, and the second metal powder is selected from at least one of Fe powder and Co powder.
5. The method of manufacturing a diamond abrasive tool according to claim 4, wherein: the weight ratio of the Ir-Ni-Ta- (B) high-temperature amorphous alloy powder, the MBD diamond powder, the first metal powder, the second metal powder and the graphite powder is (30-60): (15-45): (10-30): (3-7): (3-7).
6. The method of manufacturing a diamond abrasive tool according to claim 5, wherein: the first metal powder has a particle size ranging from 10 mu to 30 mu, the second metal powder has a particle size ranging from 10 mu to 30 mu, and the graphite powder has a particle size ranging from 5 mu to 20 mu.
7. The method of manufacturing a diamond abrasive tool according to claim 1 or 2, characterized in that: the granularity range of the MBD diamond powder is 10 mu-60 mu, and the granularity range of the Ir-Ni-Ta- (B) high-temperature amorphous alloy powder is 20 mu-40 mu.
8. A diamond grinding tool produced by the method of producing a diamond grinding tool according to any one of claims 1 to 7.
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