A diamond tool and a method of manufacturing the same

Abstract

The present application belongs to the technical field of diamond tools, and provides a diamond tool and a preparation method thereof.The preparation raw materials of the present application are sub-micron level, i.e., ultra-fine powder, which has good surface effect and volume effect, is more uniform in mixing, avoids component segregation, and makes the alloy performance more consistent; meanwhile, the ultra-fine powder has good wetting and bonding properties for diamond, and can improve the holding capacity of the matrix material for diamond.The rare earth oxide of the present application can improve the alloy density, refine the grain, improve the crystallinity of the alloy, and further improve the holding force of the matrix material for diamond particles, and improve the mechanical properties and sharpness of the diamond tool. The examples show that the wear ratio of the diamond tool of the present application is 80.317-88.41, the cutting efficiency is 0.62-0.66 g / s, and the bending strength is 868.76-1020.63 MPa.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of diamond tools, in particular to a diamond tool and a preparation method thereof. BACKGROUND

[0002] The diamond tool is composed of matrix material and diamond particles, and the matrix material and the diamond are worn synchronously in the cutting and grinding process. The compositions of the commonly used metal-based matrix material include Fe, Cu, Ni, Sn, Co, etc. The copper-based matrix material has a low sintering temperature and good comprehensive performance such as strength and wear resistance, and is widely used. The cobalt matrix material has good wear resistance and high holding force, and the tool has sharp processing and long service life, but the cobalt powder is expensive and harmful to the human body. The current development trend is to replace cobalt with iron. The iron-based matrix material has good mechanical properties similar to cobalt-based matrix material, but has poor toughness and self-sharpening property, and is easy to erode the diamond at high temperature.

[0003] A Chinese patent with publication number CN114653947A discloses a high-sharpness rare earth-iron-based diamond tool and a preparation method thereof. Specifically, the high-sharpness rare earth-iron-based diamond tool includes matrix material and diamond particles. The matrix material includes 0.25-1.5% of rare earth oxides and the balance of iron-based alloy by mass percentage. The raw materials for preparing the iron-based alloy include CuSn15 alloy, FeCu30 alloy and FeCu40Ni12Sn7Co10 alloy. The obtained rare earth-iron-based diamond tool has a sharpness to be further improved. SUMMARY

[0004] Therefore, the present application aims to provide a diamond tool and a preparation method thereof. The diamond tool provided by the present application has high sharpness.

[0005] To achieve the above-mentioned application purposes, the present application provides the following technical solutions.

[0006] The present application provides a diamond tool, and the preparation raw materials include matrix material and diamond particles. The matrix material includes rare earth oxides and FeCu30 alloy powder. The rare earth oxides and FeCu30 alloy powder are submicron.

[0007] Preferably, the mass content of the rare earth oxides in the matrix material is 0.5-2.0%, and the mass content of the FeCu30 alloy powder is 98-99.5%.

[0008] Preferably, the rare earth oxides include yttrium oxide and / or cerium oxide.

[0009] Preferably, the volume content of the diamond particles in the diamond tool is 18-35%.

[0010] Preferably, the particle size of the rare earth oxide and the FeCu30 alloy powder is independently 500-1000 nm.

[0011] The present application also provides a preparation method of the diamond tool as described in the above technical solution, comprising the following steps:

[0012] mixing the rare earth oxide, the FeCu30 alloy powder and the diamond particles and then ball milling to obtain a mixed powder;

[0013] sequentially performing press forming and pressure sintering on the mixed powder to obtain the diamond tool.

[0014] Preferably, the ball-to-material ratio of the ball milling is 2:1-4:1.

[0015] Preferably, the rotation speed of the ball milling is 500-800 r / min and the time is 10-13 h.

[0016] Preferably, the pressure of the press forming is 14-18 MPa.

[0017] Preferably, the pressure of the pressure sintering is 3-5 MPa, the temperature is 800-840 ℃ and the time is 300-460 s.

[0018] The present application provides a diamond tool, the preparation raw material of which comprises a matrix material and diamond particles, wherein the matrix material comprises rare earth oxide and FeCu30 alloy powder; and the rare earth oxide and the FeCu30 alloy powder are both submicron. The preparation raw material of the diamond tool of the present application is submicron, i.e. superfine powder, which has good surface effect and volume effect, and the mixture is more uniform, avoiding composition segregation, so that the alloy performance is more consistent; at the same time, the superfine powder has good wetting and bonding properties for diamond, and can improve the holding capacity of the matrix material for diamond. In addition, the superfine powder greatly reduces the activation energy required for metal atom diffusion during sintering, and has good sintering performance and low sintering temperature. The FeCu30 alloy powder of the present application exhibits excellent mechanical properties after hot-pressing sintering; at the same time, the use of the FeCu30 alloy powder avoids the use of Ni, Co and Sn, and simplifies the process steps. The rare earth oxide in the preparation raw material of the present application can improve the alloy density, refine the grain, improve the crystallinity of the alloy, and further improve the holding force of the matrix material for diamond particles, and improve the mechanical properties and sharpness of the diamond tool. The results of the examples show that the wear ratio of the diamond tool of the present application is 80.317-88.41, and the cutting efficiency is 0.62-0.66 g / s; which indicates that the diamond tool provided has high sharpness. At the same time, the bending strength is 868.76-1020.63 MPa. In addition, the loss of the diamond tool provided by the present application is small per unit time, but the loss of the grinding wheel is large, which indicates that the diamond tool provided has high cutting efficiency, good wear resistance and long service life.

[0019] The present application also provides a preparation method of the diamond tool, comprising the following steps: mixing rare earth oxide, FeCu30 alloy powder and diamond particles, and then ball milling to obtain a mixed powder; and then sequentially performing press forming and pressure sintering on the mixed powder to obtain the diamond tool. The preparation method provided by the present application is simple to operate. DETAILED DESCRIPTION

[0020] The present application provides a diamond tool, the preparation raw material of which comprises a matrix material and diamond particles, wherein the matrix material comprises rare earth oxide and FeCu30 alloy powder; and the rare earth oxide and the FeCu30 alloy powder are both submicron.

[0021] In the present application, the raw materials used in the present application are preferably commercially available products unless otherwise specified.

[0022] The preparation raw material of the diamond tool provided by the application comprises a matrix material, and the matrix material comprises rare earth oxide and FeCu30 alloy powder. In the application, the mass content of the rare earth oxide in the matrix material is preferably 0.5-2.0%, further preferably 1-1.5%, and the mass content of the FeCu30 alloy powder is preferably 98-99.5%, further preferably 98.5-99%. In the application, the particle size of the FeCu30 alloy powder is submicron, preferably 500-1000 nm, and the particle size of the rare earth oxide is submicron, preferably 500-1000 nm. In the application, the rare earth oxide preferably comprises yttrium oxide and / or cerium oxide.

[0023] The preparation raw material of the diamond tool provided by the application comprises diamond particles. In the application, the volume content of the diamond particles in the diamond tool is preferably 18-35%, further preferably 20-30%, and more preferably 25%. In the application, the grade of the diamond particles is preferably 40 / 45.

[0024] The application further provides a preparation method of the diamond tool described in the above technical solution, comprising the following steps:

[0025] The rare earth oxide, the FeCu30 alloy powder and the diamond particles are mixed and ball milled to obtain a mixed powder.

[0026] The mixed powder is sequentially subjected to compression molding and pressure sintering to obtain the diamond tool.

[0027] The rare earth oxide, the FeCu30 alloy powder and the diamond particles are mixed and ball milled to obtain a mixed powder.

[0028] In the application, the material of the grinding ball of the ball milling is preferably zirconium oxide. In the application, the ball-to-material ratio of the ball milling is preferably 2:1-4:1, and further preferably 3:1. In the application, the rotation speed of the ball milling is preferably 500-800 r / min, and further preferably 600-700 r / min, and the time is preferably 10-13 h. In the application, the ball milling is preferably carried out in a protective atmosphere, and the protective atmosphere is preferably argon or nitrogen. In the application, the ball milling is preferably carried out in a ball milling tank.

[0029] After obtaining the mixed powder, the mixed powder is sequentially subjected to compression molding and pressure sintering to obtain the diamond tool.

[0030] In the application, the pressure of the compression molding is preferably 14-18 MPa, and further preferably 15-17 MPa. In the application, the equipment of the compression molding is preferably a cold press.

[0031] In the present application, the pressure for pressure sintering is preferably 3-5 MPa, further preferably 3.0-4.0 MPa, and more preferably 3.5 MPa; the temperature is preferably 800-840°C, further preferably 810-830°C, and more preferably 820°C; and the time is preferably 300-460 s.

[0032] The diamond tool and the preparation method thereof provided by the present application will be described in detail below in combination with examples, but they should not be understood as limiting the protection scope of the present application.

[0033] Comparative Example 1

[0034] A diamond tool, wherein the matrix material is FeCu30 alloy powder with a particle size of 500-1000 nm, and grade 40 / 45 diamond particles with a volume concentration of 20% are added at the same time, and the preparation method comprises the following steps:

[0035] (1) The raw materials are weighed according to the above proportions, the diamond particles, FeCu30 alloy powder and zirconia grinding balls are added into a ball mill tank for ball milling, the ball-to-material ratio is 3:1, inert gas argon is introduced into the ball mill tank, the rotating speed is 600 r / min, and the ball milling is performed for 10 h to obtain a mixed powder.

[0036] (2) The mixed powder is pressed and formed on a cold press machine at a pressure of 15 MPa to obtain a green compact.

[0037] (3) The green compact is sintered at a temperature of 820°C and a pressure of 3.5 MPa for 300 s to obtain a diamond tool.

[0038] Sharpness detection: the diamond tool is placed on a rubbing wear testing machine and rubbed against a silicon carbide grinding wheel, and a pressure of 1 kg is applied, after 50 s, the grinding wheel loses 29.50 g, and the workpiece loses 0.41 g; the wear ratio is the grinding wheel loss / the workpiece loss, i.e. the wear ratio is 71.95.

[0039] The cutting efficiency is the mass loss of the grinding wheel per unit time, i.e. 0.59 g / s.

[0040] The bending strength is measured by the three-point bending method, and the result is 923.50 MPa.

[0041] Example 1

[0042] A diamond tool, wherein the matrix material is 99.5wt% FeCu30 alloy powder (with a particle size of 500-1000 nm) and 0.5wt% yttrium oxide powder (with a particle size of 500-1000 nm), and grade 40 / 45 diamond particles with a volume concentration of 20% are added at the same time, and the preparation method comprises the following steps:

[0043] (1) The raw materials are weighed according to the above-mentioned proportions, the yttrium oxide powder, diamond particles, FeCu30 alloy powder and zirconium oxide grinding balls are added into a ball mill tank for ball milling, the ball-to-material ratio is 3:1, inert gas argon is introduced into the ball mill tank, the rotating speed is 600 r / min, and the ball milling is performed for 10 h to obtain a mixed powder.

[0044] (2) The mixed powder is pressed and formed on a cold press at a pressure of 15 MPa to obtain a green compact.

[0045] (3) The green compact is sintered at a temperature of 820 ℃ and a pressure of 3.5 MPa for 300 s to obtain a diamond tool.

[0046] The sharpness detection is performed as follows: the diamond tool is placed on a rubbing wear testing machine, and is matched with a green silicon carbide grinding wheel for grinding, while a pressure of 1 kg is applied, after 50 s, the grinding wheel loses 30.91 g, and the workpiece loses 0.38 g; the wear ratio is equal to the grinding wheel loss / the workpiece loss, that is, the wear ratio is 81.34.

[0047] The cutting efficiency is the mass loss of the grinding wheel per unit time, that is, 0.62 g / s.

[0048] The bending strength is measured by the three-point bending method, and the result is 868.76 MPa.

[0049] Example 2

[0050] A diamond tool, the matrix material is 99.5 wt% of FeCu30 alloy powder (the particle size is 500-1000 nm) and 0.5 wt% of cerium oxide powder (the particle size is 500-1000 nm), and 20% of volume concentration of grade 40 / 45 diamond particles are added, and the preparation method comprises the following steps:

[0051] (1) The raw materials are weighed according to the above-mentioned proportions, the cerium oxide powder, diamond particles, FeCu30 alloy powder and zirconium oxide grinding balls are added into a ball mill tank for ball milling, the ball-to-material ratio is 3:1, inert gas is introduced into the ball mill tank, the rotating speed is 600 r / min, and the ball milling is performed for 10 h to obtain a mixed powder.

[0052] (2) The mixed powder is pressed and formed on a cold press at a pressure of 15 MPa to obtain a green compact.

[0053] (3) The green compact is sintered at a temperature of 820 ℃ and a pressure of 3.5 MPa for 300 s to obtain a diamond tool.

[0054] The sharpness detection is performed as follows: the diamond tool is placed on a rubbing wear testing machine, and is matched with a green silicon carbide grinding wheel for grinding, while a pressure of 1 kg is applied, after 50 s, the grinding wheel loses 32.93 g, and the workpiece loses 0.41 g; the wear ratio is equal to the grinding wheel loss / the workpiece loss, that is, the wear ratio is 80.317.

[0055] The cutting efficiency is the mass loss of the grinding wheel per unit time, i.e. 0.66 g / s.

[0056] The bending strength is measured by the three-point bending method, and the result is 948.75 MPa.

[0057] Example 3

[0058] A diamond tool, the matrix material is 98.0 wt% of FeCu30 alloy powder (particle size is 500-1000 nm) and 2.0 wt% of yttrium oxide powder (particle size is 500-1000 nm), and 20% of grade 40 / 45 diamond particles are added, and the preparation method comprises the following steps:

[0059] (1) The raw materials are weighed according to the above proportions, the yttrium oxide powder, the diamond particles, the FeCu30 alloy powder and the zirconium oxide grinding ball are added into the ball mill pot for ball milling, the ball-to-material ratio is 3:1, inert gas is introduced into the ball mill pot, the rotating speed is 600 r / min, and the ball milling is performed for 10 h to obtain the mixed powder.

[0060] (2) The mixed powder is pressed into a compact by a cold press at a pressure of 15 MPa to obtain a green compact.

[0061] (3) The green compact is sintered at a temperature of 820℃ and a pressure of 3.5 MPa for 300 s to obtain the diamond tool.

[0062] Sharpness detection: the diamond tool is placed on the rubbing wear testing machine, and is ground against the green silicon carbide grinding wheel while applying a pressure of 1 kg, after 50 s, the grinding wheel loses 32.71 g, and the workpiece loses 0.37 g; the wear ratio = grinding wheel loss / workpiece loss, i.e. the wear ratio is 88.41.

[0063] The cutting efficiency is the mass loss of the grinding wheel per unit time, i.e. 0.65 g / s.

[0064] The bending strength is measured by the three-point bending method, and the result is 1020.63 MPa.

[0065] Comparative Example 2

[0066] The high-sharpness rare earth-iron-based diamond tool is composed of a matrix material and diamond particles; the matrix material has a composition of 0.75% of yttrium oxide and the balance of iron-based alloy in terms of mass percentage; the yttrium oxide is yttrium oxide; the raw materials for preparing the iron-based alloy are 26.80% of CuSn15 alloy, 62.53% of FeCu30 alloy and 9.92% of FeCu40Ni12Sn7Co10 alloy in terms of mass percentage of the matrix material; the particle size of the yttrium oxide is 0.2-2.0 μm, and the D50 is 4.0-10.0 μm; the particle size of the CuSn15 alloy, the FeCu30 alloy and the FeCu40Ni12Sn7Co10 alloy is 300 mesh; the volume content of the diamond particles in the high-sharpness rare earth-iron-based diamond tool is 20%; and the grade of the diamond particles is 40 / 45.

[0067] The preparation method of the high-sharpness rare earth-iron-based diamond tool comprises the following steps:

[0068] (1) mixing yttrium oxide, CuSn15 alloy, FeCu30 alloy, FeCu40Ni12Sn7Co10 alloy and diamond particles and then ball milling to obtain a mixed powder; the ball milling uses zirconia milling balls; the ball-to-material ratio of the ball milling is 3:1; the rotating speed of the ball milling is 500 r / min; the ball milling time is 12 h; and the ball milling atmosphere is argon.

[0069] (2) sequentially performing press forming and pressure sintering on the mixed powder obtained in the step (1) to obtain the high-sharpness rare earth-iron-based diamond tool; the press forming pressure is 20 MPa; the pressure sintering temperature is 800 ℃; the pressure sintering time is 60 s; and the pressure sintering pressure is 15 MPa.

[0070] The sharpness of the prepared high-sharpness rare earth-iron-based diamond tool is detected: the high-sharpness rare earth-iron-based diamond tool is placed on a rubbing wear testing machine and rubbed against a green silicon carbide grinding wheel while applying a pressure of 1 kg; after 50 s, the grinding wheel loses 21.9 g, and the workpiece loses 0.27 g; and the wear ratio is equal to the grinding wheel loss divided by the workpiece loss, i.e. the wear ratio is 81.1.

[0071] The cutting efficiency is the mass loss of the grinding wheel per unit time, i.e. 0.44 g / s.

[0072] The three-point bending method is used to detect the bending strength of the high-sharpness rare earth-iron-based diamond tool, and the bending strength is measured to be 830.75 MPa.

[0073] The above merely describes the preferred embodiments of the present application, and it should be pointed out that, for those skilled in the art, several improvements and refinements can be made without departing from the principles of the present application, and these improvements and refinements should also be considered as falling within the protection scope of the present application.

Claims

1. A diamond tool, characterized by, The preparation raw materials include matrix material and diamond particles, the matrix material includes rare earth oxide and FeCu30 alloy powder; The rare earth oxide and FeCu30 alloy powder are both submicron; The mass content of the rare earth oxide in the matrix material is 0.5-2.0%, and the mass content of the FeCu30 alloy powder is 98-99.5%; The rare earth oxide includes yttrium oxide and / or cerium oxide; The volume content of the diamond particles in the diamond tool is 18-35%; The particle size of the rare earth oxide and FeCu30 alloy powder is independently 500-1000nm; The preparation method of the diamond tool includes the following steps: mixing the rare earth oxide, FeCu30 alloy powder and diamond particles and then ball milling to obtain mixed powder; sequentially performing pressing forming and pressure sintering on the mixed powder to obtain the diamond tool; The ball milling ball-to-material ratio is 2:1-4:1; The ball milling rotation speed is 500-800r / min, and the time is 10-13h; The pressing forming pressure is 14-18MPa; The pressure sintering pressure is 3-5MPa, the temperature is 800-840℃, and the time is 300-460s.

2. The method of producing a diamond tool according to claim 1, characterized by, The preparation method of the diamond tool includes the following steps: mixing the rare earth oxide, FeCu30 alloy powder and diamond particles and then ball milling to obtain mixed powder; sequentially performing pressing forming and pressure sintering on the mixed powder to obtain the diamond tool; The ball milling ball-to-material ratio is 2:1-4:1; The ball milling rotation speed is 500-800r / min, and the time is 10-13h; The pressing forming pressure is 14-18MPa; The pressure sintering pressure is 3-5MPa, the temperature is 800-840℃, and the time is 300-460s.