Composite diamond string bead, preparation method thereof, diamond string bead wire saw and application of diamond string bead wire saw

Abstract

The invention relates to the technical field of preparation of diamond string beads, in particular to a composite diamond string bead, a preparation method of the composite diamond string bead, a diamond string bead wire saw and application of the diamond string bead wire saw. The composite diamond string bead comprises the following raw materials: a first component and diamond, the first component comprises the following components in percentage by mass: 80%-95% of metal and 5%-20% of ceramic; the concentration of the diamond is 30%-60%; the metal comprises at least three of Fe, Co, Cu, Sn, Ni, Zn, Cr, Al and Pb; and the ceramic comprises at least one of Al2O3, SiC, SiO2, B4C and WC. The composite diamond string bead obtained through cooperation of all the components is high in strength and toughness, good in self-sharpening performance and long in service life.

Description

Technical Field

[0001] The present invention relates to the technical field of the preparation of diamond beads, and in particular, to a composite diamond bead and its preparation method, a diamond bead wire saw and its application. Background Art

[0002] In recent years, the number of blast furnaces below 1000m 3 has been continuously decreasing, while the number of large blast furnaces above 4000m 3 has been increasing rapidly. Before a blast furnace is shut down for maintenance, the remaining molten iron in the furnace needs to be discharged outside the furnace. For a large blast furnace of 4000m 3 , it is very difficult to completely drain the residual iron, and hundreds to thousands of tons of residual iron may remain in the furnace. Removing the residual iron in the blast furnace is an important link in the major overhaul project of the blast furnace. In the past, the blasting method was used to remove the residual iron in the blast furnace, which has high risks, long cycles, great difficulties, and is prone to damage the surrounding equipment. The diamond bead wire saw is a flexible cutting tool, which has been gradually popularized in recent years for cutting the residual iron in the blast furnace. However, traditional diamond beads use metal powder as the binder. Although metal binders have advantages such as strong holding force for diamonds and high impact resistance, they are mainly used for processing hard and brittle materials such as stone and concrete. When cutting the residual iron in the blast furnace, there are problems such as poor self-sharpening, slow speed, and low efficiency.

[0003] In view of this, the present invention is specifically proposed. Summary of the Invention

[0004] An object of the present invention is to provide a composite diamond bead, which has the characteristics of high impact resistance, high strength, high toughness, and long service life.

[0005] Another object of the present invention is to provide a preparation method for the above-mentioned composite diamond bead. The method is simple, efficient, highly safe, environmentally friendly, and the obtained composite diamond bead has excellent impact resistance, strength, toughness, and long service life.

[0006] Another object of the present invention is to provide a diamond bead wire saw, which has high self-sharpening, high cutting efficiency, and long service life.

[0007] In order to achieve the above objects of the present invention, the following technical solutions are specifically adopted:

[0008] A composite diamond bead, comprising raw materials: a first component and diamond; the first component comprises metal and ceramic. By mass percentage, the metal is 80% - 95%, and the ceramic is 5% - 20%; the concentration of the diamond is 30% - 60%;

[0009] The metal comprises at least three of Fe, Co, Cu, Sn, Ni, Zn, Cr, Al, and Pb;

[0010] The ceramic includes Al 2 O 3 、SiC, SiO 2 、B 4 C and at least one of WC.

[0011] In one embodiment, the metal includes the following components by mass percentage:

[0012] Fe 0 - 75%, Co 0 - 70%, Cu 5% - 30%, Sn 0.5% - 15%, Ni 1% - 15%, Zn 0 - 15%, Cr 0 - 8%, Al 0 - 12% and Pb 0 - 10%;

[0013] The ceramic includes the following components by mass percentage:

[0014] Al 2 O 3 0 - 30%, SiC 0 - 30%, SiO 2 0 - 30%, B 4 C 0 - 30% and WC 0.5% - 70%.

[0015] In one embodiment, the raw materials further include a dispersant and a mold release agent. The mass of the dispersant is 0.8 - 1.5‰ of the total mass of the metal, ceramic and diamond, and the mass of the mold release agent is 1.5 - 2.5‰ of the total mass of the metal, ceramic and diamond.

[0016] In one embodiment, the mold release agent includes zinc stearate.

[0017] In one embodiment, the dispersant includes paraffin wax.

[0018] In one embodiment, the mesh numbers of the Fe and Co are -1000 mesh to -500 mesh respectively; the mesh numbers of the Cu, Sn, Ni, Zn, Cr, Al, Pb and the ceramic are -500 mesh to -300 mesh respectively.

[0019] In one embodiment, the particle size of the diamond includes one or more combinations of 30 / 35 mesh, 35 / 40 mesh, 40 / 45 mesh, 45 / 50 mesh, 50 / 60 mesh and 70 / 80 mesh.

[0020] The preparation method of the composite diamond beads as described above includes the following steps:

[0021] Mix the metal, ceramic, diamond, mold release agent and dispersant, and then perform cold pressing to obtain a cold-pressed blank, and perform hot pressing on the cold-pressed blank.

[0022] In one embodiment, the time of the mixing treatment is 1.5 to 2.5 h.

[0023] In one embodiment, the pressure of the cold pressing treatment is 200 to 500 MPa.

[0024] In one embodiment, the temperature of the hot pressing treatment is 710 to 900 °C, and the heat preservation time of the hot pressing treatment is 3 to 8 min.

[0025] In one embodiment, post-treatment is performed on the material obtained by the hot pressing treatment, and the post-treatment includes sandblasting, drilling, cleaning, drying, and gluing.

[0026] A diamond bead wire saw includes the composite diamond beads described above or the composite diamond beads prepared by the preparation method of the composite diamond beads described above.

[0027] Application of the diamond bead wire saw in cutting the residual iron in a blast furnace.

[0028] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0029] (1) The composite diamond beads obtained by the cooperation of the components of the present invention have high impact resistance, high strength, high toughness, and long service life.

[0030] (2) The preparation method of the composite diamond beads of the present invention is simple, efficient, highly safe, environmentally friendly, and the obtained composite diamond beads have excellent impact resistance, strength, toughness, and long service life.

[0031] (3) The diamond bead wire saw of the present invention has high self-sharpening, high cutting efficiency, and long service life. Description of the Drawings

[0032] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the following drawings are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0033] Figure 1 It is the scanning electron microscope image of the composite diamond beads in Example 1 of the present invention;

[0034] Figure 2 It is the scanning electron microscope image of the composite diamond beads in Example 2 of the present invention;

[0035] Figure 3 It is the surface scanning distribution diagram of each element of the composite diamond beads in Example 1 of the present invention. Detailed Embodiments

[0036] The following will describe the implementation of the present invention in detail in conjunction with embodiments. However, those skilled in the art will understand that the following embodiments are only used to illustrate the present invention and should not be regarded as limiting the scope of the present invention. For those not specified in the embodiments, they are carried out under conventional conditions or conditions recommended by the manufacturer. For reagents or instruments not specified by the manufacturer, they are all conventional products that can be obtained through commercial purchase.

[0037] According to one aspect of the present invention, the present invention relates to a composite diamond bead, comprising raw materials: a first component and diamond; the first component comprises a metal and a ceramic. By mass percentage, the metal is 80% - 95%, and the ceramic is 5% - 20%; the concentration of the diamond is 30% - 60%.

[0038] The metal comprises at least three of Fe, Co, Cu, Sn, Ni, Zn, Cr, Al, and Pb.

[0039] The ceramic comprises Al 2 O 3 , SiC, SiO 2 , B 4 , C, and at least one of WC.

[0040] In the present invention, the metals Fe, Co, Ni, and Cr serve as the skeleton phase of the diamond bead, and their main functions are to improve the strength, hardness, and bonding characteristics of the bead, etc.; the metals Cu, Zn, and Sn serve as the bonding phase of the diamond bead, and their main functions are to lower the sintering temperature of the bead, improve the density and alloying degree of the bead; the metals Al and Pb serve as the additive phase of the diamond bead, and their main functions are to improve the interfacial bonding state between the diamond and the bead matrix, thereby enhancing the interfacial bonding strength between the two. The ceramics Al 2 O 3 , SiC, SiO 2 , BC, and WC serve as the wear-resistant phase of the diamond bead, and their main functions are to cooperate with the diamond to improve the wear resistance of the bead matrix and extend the service life of the bead. In one implementation, in the first component, by mass percentage, the metal is 80%, 82%, 85%, 88%, 90%, 92%, or 95%, etc., and the ceramic is 5%, 8%, 10%, 12%, 15%, 18%, or 20%, etc. According to the diamond concentration system of 400%, the concentration of the diamond is 30% - 60%, such as 30%, 35%, 40%, 45%, 50%, 55%, or 60%, etc. The composite diamond bead of the present invention has high impact resistance, high strength, high toughness, and long life through the cooperation of various components, and can be used for cutting the residual iron in blast furnaces.

[0041] In one embodiment, the metal is 85% - 90% and the ceramic is 10% - 15%; the concentration of diamond is 40% - 50%. Each component of the composite diamond beads of the present invention within the above ranges is more conducive to improving its self-sharpening ability, cutting efficiency and service life.

[0042] In one embodiment, the metal comprises the following components by mass percentage:

[0043] Fe 0 - 75%, Co 0 - 70%, Cu 5% - 30%, Sn 0.5% - 15%, Ni 1% - 15%, Zn 0 - 15%, Cr 0 - 8%, Al 0 - 12% and Pb 0 - 10%.

[0044] In one embodiment, by mass percentage, Fe is 0.5%, 1%, 5%, 8%, 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45%, 50%, 55%, 60%, 70%, 75%, etc.; Co is 1%, 5%, 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45%, 50%, 55%, 60% or 70%, etc.; Cu is 5%, 8%, 10%, 15%, 18%, 20%, 25%, 30%, etc.; Sn is 0.5%, 1%, 2%, 5%, 8%, 10%, 12% or 15%, etc.; Ni is 1%, 2%, 5%, 8%, 10%, 12% or 15%, Zn 1%, 2%, 3%, 5%, 8%, 10%, 12%, 15%, etc., Cr is 0.5%, 1%, 2%, 3%, 4%, 5%, 6%, 7% or 8%, Al 1%, 2%, 5%, 8%, 10% or 12%, Pb is 1%, 2%, 5%, 8%, 9% or 10%, etc. Within the suitable dosage ranges of the above metal elements of the present invention, the synergistic cooperation effect among the components is better, which is more conducive to enhancing the impact resistance, high strength and high toughness of the composite diamond beads.

[0045] In one embodiment, the ceramic comprises the following components by mass percentage:

[0046] Al 2 O 3 0 - 30%, SiC 0 - 30%, SiO 2 0 - 30%, B 4 C 0 - 30% and WC 0.5% - 100%.

[0047] In one embodiment, by mass percentage, Al 2 O 31%, 2%, 5%, 8%, 10%, 12%, 15%, 18%, 20%, 25% or 30%, etc.; SiC is 1%, 5%, 8%, 10%, 15%, 20%, 25%, 30%, etc.; SiO 2 is 1%, 2%, 5%, 10%, 15%, 20%, 25%, 28% or 30%, etc.; B 4 C is 1%, 2%, 5%, 8%, 10%, 15%, 18%, 20%, 25% or 30%, etc.; WC is 0.5%, 1%, 2%, 3%, 5%, 8%, 10%, 15%, 18%, 20%, 25%, 28%, 30%, 40%, 50%, 60% or 70%, etc. The dosage ratios of the above ceramic components in the present invention are within a suitable range, and the coordination and cooperation effects among the components are better, which is more conducive to improving the impact resistance, strength and toughness of the composite diamond beads.

[0048] In one embodiment, the raw materials further include a dispersant and a demolding agent; the mass of the dispersant is 0.8 - 1.5‰ of the total mass of the metal, ceramic and diamond, such as 0.8‰, 0.9‰, 1‰, 1.2‰, 1.3‰, 1.4‰ or 1.5‰, etc. Adding an appropriate amount of dispersant in the present invention is more conducive to the dispersion and mixing of each raw material. In one embodiment, the dispersant includes paraffin.

[0049] In one embodiment, the mass of the demolding agent is 1.5 - 2.5‰ of the total mass of the metal, ceramic and diamond, such as 1.5‰, 1.8‰, 2‰, 2.2‰ or 2.5‰, etc. In one embodiment, the demolding agent includes zinc stearate.

[0050] In one embodiment, the mesh numbers of the Fe and Co are respectively -1000 mesh to -500 mesh, such as -1000 mesh, -800 mesh, -500 mesh, etc. In one embodiment, the mesh numbers of the Cu, Sn, Ni, Zn, Cr, Al, Pb and ceramic are respectively -500 mesh to -300 mesh, such as -500 mesh, -400 mesh, -300 mesh, etc.

[0051] In one embodiment, diamond is used as an abrasive, and the particle size of the diamond includes one or more combinations of 30 / 35 mesh, 35 / 40 mesh, 40 / 45 mesh, 45 / 50 mesh, 50 / 60 mesh, 70 / 80 mesh. The particle size of the abrasive grain is the sieve hole size of two adjacent sieves through which the abrasive grain can pass and cannot pass.

[0052] In one embodiment, by mass percentage, the diamond comprises: 10% to 20% of diamond with a particle size of 30 / 35, 30% to 40% of diamond with a particle size of 35 / 40, 30% to 40% of diamond with a particle size of 45 / 50, and 10% to 20% of diamond with a particle size of 50 / 60.

[0053] According to another aspect of the present invention, the present invention also relates to a method for preparing the composite diamond beads, comprising the following steps:

[0054] Mix metals, ceramics, diamond, release agent and dispersant, and then perform cold pressing to obtain a cold-pressed blank, and perform hot pressing on the cold-pressed blank.

[0055] The method for the composite diamond beads of the present invention is simple and easy to operate, with high efficiency and high safety. The obtained composite diamond beads have higher impact resistance, strength and toughness, and longer service life.

[0056] In one embodiment, the time of the mixing treatment is 1.5 to 2.5 h, such as 1.5 h, 2 h or 2.5 h, etc.

[0057] In one embodiment, the pressure of the cold pressing treatment is 200 to 500 MPa;

[0058] In one embodiment, the temperature of the hot pressing treatment is 710 to 900 °C, such as 710 °C, 750 °C, 780 °C, 800 °C, 850 °C, 900 °C, etc., and the heat preservation time of the hot pressing treatment is 3 to 8 min, such as 3 min, 4 min, 5 min, 6 min, 7 min, 8 min, etc. In one embodiment, the cold-pressed blank is loaded into a graphite mold, and hot pressing treatment is performed using a hot pressing sintering machine. Infrared temperature measurement is used for the hot pressing treatment.

[0059] In one embodiment, post-treatment is performed on the material obtained by the hot pressing treatment. The post-treatment includes sandblasting, drilling, cleaning, drying and gluing. Through the above post-treatment steps, a foundation is laid for the subsequent preparation of the diamond bead wire saw.

[0060] According to another aspect of the present invention, the present invention also relates to a diamond bead wire saw, comprising the composite diamond beads described above or the composite diamond beads prepared by the method for preparing the composite diamond beads described above.

[0061] The diamond bead wire saw of the present invention has high self-sharpening property, high cutting efficiency and long service life.

[0062] In one embodiment, after the composite diamond string undergoes processes such as sandblasting, drilling, tapping, cleaning, drying, gluing, string threading, glue injection, and edge sharpening, it is prepared into a diamond string bead wire saw. The diamond string bead wire saw can be used for cutting the residual iron in a blast furnace.

[0063] The following will be further explained and illustrated in conjunction with specific examples, comparative examples, and drawings.

[0064] Example 1

[0065] A composite diamond string bead includes raw materials: a first component and diamond; by mass percentage, the first component includes: Co 58%, Cu 15%, Ni 11%, Zn 2%, Cr 2%, Sn 2%, and WC 10%; among them, the mesh number of Co is -800 mesh; the mesh numbers of Cu, Sn, Ni, Zn, Cr, Al, Pb, and WC are -300 mesh respectively; prepared according to a diamond concentration of 400%, with a diamond concentration of 50% added. By mass percentage, the diamond includes: 20% of diamond with a particle size of 30 / 35, 30% of diamond with a particle size of 35 / 40, 30% of diamond with a particle size of 45 / 50, and 20% of diamond with a particle size of 50 / 60.

[0066] The preparation method of the composite diamond string bead in this example includes the following steps:

[0067] Weigh the raw materials according to the above ratio. By mass percentage, add 1‰ paraffin wax as a dispersant and 2‰ zinc stearate as a demolding agent, and mix the materials with a three-dimensional mixer for 2 hours; after mixing evenly, cold press them into bead blanks. The cold pressing pressure is 350 MPa, the outer diameter of the bead is 11.6 mm, and the height is 9.2 mm; heat press and sinter the bead blanks. The highest sintering temperature is 850 °C (infrared temperature measurement), and the holding time is 5 minutes. The outer diameter of the bead is 11.7 mm, and the height is 6.5 mm.

[0068] The electron microscope picture of the composite diamond string bead in this example is as Figure 1 shown.

[0069] The surface scanning distribution of each element of the composite diamond string bead is as Figure 3 shown.

[0070] Table 1 shows the surface scanning content of each element of the composite diamond string bead.

[0071] Table 1 Surface Scanning Content of Elements of Composite Diamond String Beads

[0072] Element Mass fraction / % Co 57.24 Cu 15.66 Ni 11.79 WC 10.03 Cr 1.90 Sn 1.77 Zn 1.61

[0073] Example 2

[0074] A composite diamond bead, comprising raw materials: a first component and diamond; by mass percentage, the first component comprises: Fe 51%, Cu 12%, Ni1 12%, Sn 2%, Pb2%, Cr 1%, WC 18% and Al 2 O 3 2%; wherein, the mesh number of Fe is -800 mesh; the mesh numbers of Cu, Sn, Ni, Zn, Cr, Al, Pb, WC, Al 2 O 3 are -300 mesh respectively; prepared according to a diamond concentration of 400%, adding a diamond concentration of 55%, by mass percentage, the diamond comprises: 50% of diamond with a particle size of 30 / 35, 30% of diamond with a particle size of 35 / 40, and 20% of diamond with a particle size of 45 / 50.

[0075] The preparation method of the composite diamond bead of this embodiment comprises the following steps:

[0076] Weigh the raw materials according to the above ratio. By mass percentage, add 1‰ paraffin wax as a dispersant and 2‰ zinc stearate as a demolding agent, and mix the materials with a three-dimensional mixer for 2 h; after mixing evenly, cold press them into bead blanks. The cold pressing pressure is 350 MPa, the outer diameter of the bead is 11.6 mm, and the height is 9.2 mm; perform hot pressing sintering on the bead blanks. The highest sintering temperature is 860 °C (infrared temperature measurement), the holding time is 5 min, the outer diameter of the bead is 11.7 mm, and the height is 6.5 mm.

[0077] The electron microscope picture of the composite diamond bead of this embodiment is as Figure 2 shown.

[0078] Example 3

[0079] A composite diamond bead, comprising raw materials: a first component and diamond; by mass percentage, the first component comprises Fe 44%, Co 8%, Cu 12%, Sn 3%, Ni 8%, Zn 3%, Cr 5%, Al 2%, Pb1%, Al 2 O 3 2%, SiC 3%, SiO 2 2%, B 4 C 3% and WC 4%. Among them, in the first component, the mesh numbers of Fe and Co are -800 mesh respectively; the mesh numbers of the other components are -300 mesh respectively; prepared according to a diamond concentration of 400%, adding a diamond concentration of 50%, by mass percentage, the diamond comprises: 10% of diamond with a particle size of 30 / 35, 40% of diamond with a particle size of 35 / 40, 40% of diamond with a particle size of 45 / 50, and 10% of diamond with a particle size of 50 / 60.

[0080] The preparation method of the composite diamond beads in this embodiment includes the following steps:

[0081] Weigh the raw materials according to the above ratio. By mass percentage, add 1‰ paraffin wax as a dispersant and 2‰ zinc stearate as a demolding agent, and mix the materials with a three-dimensional mixer for 2 hours; after mixing evenly, cold-press them into bead blanks. The cold-pressing pressure is 350 MPa, the outer diameter of the beads is 11.6 mm, and the height is 9.2 mm; then heat-press and sinter the bead blanks. The highest sintering temperature is 810 °C (infrared temperature measurement), and the holding time is 6 minutes. The outer diameter of the beads is 11.7 mm, and the height is 6.5 mm.

[0082] The composite diamond beads in this embodiment are further made into diamond bead wire saws, which can be used for cutting the residual iron in blast furnaces.

[0083] Example 4

[0084] A kind of composite diamond beads, including raw materials: the first component and diamond; by mass percentage, the first component includes 40% Fe, 12% Co, 10% Cu, 2% Sn, 4% Ni, 5% Zn, 2% Cr, 5% Al, 5% Pb, Al 2 O 3 2%, SiC 3%, SiO 2 2%, B 4 C 3% and WC 5%. Among them, in the first component, the mesh numbers of Fe and Co are -800 mesh respectively; the mesh numbers of the other components are -300 mesh respectively; prepared according to a diamond concentration of 400%, add a diamond concentration of 50%. By mass percentage, the diamond includes: 10% diamond with a particle size of 30 / 35, 40% diamond with a particle size of 35 / 40, 40% diamond with a particle size of 45 / 50, and 10% diamond with a particle size of 50 / 60.

[0085] The preparation method of the composite diamond beads in this embodiment includes the following steps:

[0086] Weigh the raw materials according to the above ratio. By mass percentage, add 1‰ paraffin wax as a dispersant and 2‰ zinc stearate as a demolding agent, and mix the materials with a three-dimensional mixer for 2 hours; after mixing evenly, cold-press them into bead blanks. The cold-pressing pressure is 350 MPa, the outer diameter of the beads is 11.6 mm, and the height is 9.2 mm; then heat-press and sinter the bead blanks. The highest sintering temperature is 780 °C (infrared temperature measurement), and the holding time is 4 minutes. The outer diameter of the beads is 11.7 mm, and the height is 6.5 mm.

[0087] Example 5

[0088] A composite diamond bead, comprising raw materials: a first component and diamond; by mass percentage, the first component comprises Co 60%, Cu 18%, Ni 8%, Sn 4% and WC 10%, wherein, in the first component, the mesh number of Co is -800 mesh; the mesh number of the other components is -300 mesh; prepared according to a diamond concentration of 400%, with a diamond concentration of 50% added, and the diamond used is diamond with a particle size of 45 / 50.

[0089] The preparation method of the composite diamond bead of this embodiment comprises the following steps:

[0090] Weigh the raw materials according to the above ratio. By mass percentage, add 1‰ paraffin wax as a dispersant and 2‰ zinc stearate as a demolding agent, and mix the materials with a three-dimensional mixer for 2 h; after mixing evenly, cold press into bead blanks, with the cold pressing pressure being 350 MPa, the outer diameter of the bead being 11.6 mm, and the height being 9.2 mm; subject the bead blanks to hot press sintering, with the highest sintering temperature at 835 °C (infrared temperature measurement), the holding time being 6 min, the outer diameter of the bead being 11.7 mm, and the height being 6.5 mm.

[0091] Comparative Example 1

[0092] A composite diamond bead, comprising raw materials: a first component and diamond; by mass percentage, the first component comprises: Co 65%, Cu 15%, Ni 11%, Zn 2%, Cr 2%, Sn 2% and WC 3%; other conditions are the same as those in Example 1.

[0093] The preparation method of the composite diamond bead in this comparative example is the same as that in Example 1 except for the different raw material ratios.

[0094] Comparative Example 2

[0095] A composite diamond bead, except that the concentration of added diamond is 29%, and other conditions are the same as those in Example 1.

[0096] Experimental Example

[0097] Prepare the composite diamond beads obtained in each example and comparative example into diamond bead wire saws with a length of 10 m, with 40 beads per meter. Use an electric wire saw machine to conduct cutting experiments on a reinforced concrete column with a cross-sectional area of 1 m 2 The concrete grade is C30, and there are 32 steel bars with a diameter of 32 mm in the 1 m 2 cross-section. The results are shown in Table 2.

[0098] Table 2 Test results of cutting efficiency and life of diamond wire saw

[0099] Group <![CDATA[Cutting efficiency (m 2 / h)]]> <![CDATA[Cutting life (m 2 / m)]]> Example 1 3.2 3.8 Example 2 2.8 4.8 Example 3 2.9 4.5 Example 4 3.0 4.3 Example 5 3.3 3.6 Comparative Example 1 2.8 3.1 Comparative Example 2 2.6 2.1

[0100] As can be seen from Table 2, the diamond wire saws prepared from the composite diamond beads obtained in the embodiments of the present invention have high cutting efficiency and cutting life, with a cutting efficiency of more than 2.8 m per hour and a cutting life of more than 3.6 m per meter of the wire saw. 2 The cutting efficiency and cutting life of the diamond wire saws prepared from the composite diamond beads obtained by the methods of Comparative Examples 1-2 are relatively poor. 2 Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

[0101] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A composite diamond bead, characterized in that: The raw materials include: a first component and diamond; the first component includes metal and ceramic, in which the metal accounts for 80% to 95% by mass, the ceramic accounts for 5% to 20% by mass, and the concentration of diamond is 30% to 60% by mass; The metal includes at least three of Fe, Co, Cu, Sn, Ni, Zn, Cr, Al and Pb; The ceramic includes at least one of Al2O3, SiC, SiO2, B4C and WC.

2. The composite diamond bead according to claim 1, characterized in that: The metal comprises the following components in mass percentage: Fe 0~75%, Co 0~70%, Cu 5%~30%, Sn 0.5%~15%, Ni 1%~15%, Zn 0~15%, Cr 0~8%, Al 0~12% and Pb 0~10%; The ceramic comprises the following components in percentage by mass: Al2O3 0~30%, SiC 0~30%, SiO2 0~30%, B4C 0~30% and WC 0.5%~70%.

3. The composite diamond bead according to claim 1 or 2, characterized in that: Contains at least one of the following features (1) to (3): (1) The raw materials further include a dispersant and a release agent, the mass of the dispersant is 0.8 to 1.5‰ of the total mass of the metal, ceramic and diamond, and the mass of the release agent is 1.5 to 2.5‰ of the total mass of the metal, ceramic and diamond; (2) The release agent includes zinc stearate; (3) The dispersant includes paraffin.

4. The composite diamond bead according to claim 1, characterized in that: The mesh sizes of Fe and Co are respectively -1000 mesh to -500 mesh; the mesh sizes of Cu, Sn, Ni, Zn, Cr, Al, Pb and ceramics are respectively -500 mesh to -300 mesh.

5. The composite diamond bead according to claim 1, characterized in that: The particle size of the diamond includes one or more combinations of 30 / 35 mesh, 35 / 40 mesh, 40 / 45 mesh, 45 / 50 mesh, 50 / 60 mesh and 70 / 80 mesh.

6. The method for preparing a composite diamond bead according to any one of claims 1 to 5, characterized in that: The following steps are involved: The metal, ceramic, diamond, a release agent and a dispersant are mixed and then cold pressed to obtain a cold pressed blank, and the cold pressed blank is hot pressed.

7. The method for preparing composite diamond beads according to claim 6, characterized in that: The mixing treatment time is 1.5 to 2.5 hours.

8. The method for preparing composite diamond beads according to claim 6, characterized in that: Contains at least one of the following features (1) to (3): (1) The pressure of the cold pressing treatment is 200 to 500 MPa; (2) The temperature of the hot pressing treatment is 710-900° C., and the holding time of the hot pressing treatment is 3-8 minutes. (3) Post-processing the material obtained by the hot pressing treatment, wherein the post-processing includes sandblasting, drilling, cleaning, drying and gluing.

9. A diamond bead wire saw, characterized in that: The invention relates to a composite diamond bead according to any one of claims 1 to 5 or a composite diamond bead prepared by the method for preparing a composite diamond bead according to any one of claims 6 to 8.

10. Use of the diamond bead wire saw according to claim 9 in cutting residual iron in blast furnaces.

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