A rare earth doped tungsten powder for preparing diamond wire and preparation method thereof

Abstract

The present invention belongs to the technical field of powder metallurgy, and specifically relates to a rare earth-doped tungsten powder for preparing diamond wire and a preparation method thereof, wherein APT and rare earth metal salts are mixed and roasted in multiple steps to be converted into a composite oxide precursor with fine particle size and uniform mixing, and the metal tungsten is reduced under certain conditions, and rare earth oxides with good thermal stability still exist in the form of oxides, thereby obtaining rare earth-doped tungsten powder. The present invention broadens the raw materials and processes of rare earth-doped tungsten powder for diamond wire, and the preparation method does not generate waste liquid and waste gas, and solves the uniformity problem of solid-solid doping by quantitatively mixing in multiple steps, and easily realizes uniform mixing and dispersion of finer particles, and prepares doped tungsten powder with fine particle size and uniform composition, which has broad application prospects in practical applications.

Description

Technical Field

[0001] The invention belongs to the technical field of powder metallurgy, and specifically relates to rare earth doped tungsten powder for preparing diamond wire and a preparation method thereof. Background Art

[0002] Doped tungsten wire has higher tensile strength, better anti-sagging performance, flexibility and processing performance than pure tungsten wire. Therefore, tungsten wire diamond wire mostly uses doped tungsten wire as the mother wire of diamond wire. Doped tungsten powder is a key link in determining the performance of doped tungsten wire. To obtain high-performance tungsten wire diamond wire, it is first necessary to prepare doped tungsten powder with fine particle size and uniform distribution of doping elements. At present, the main methods of doping tungsten powder are: liquid-liquid doping, liquid-solid doping, and solid-solid doping. Among them, liquid-liquid doping and liquid-solid doping will produce a large amount of waste liquid, increasing the subsequent processing cost, while solid-solid doping avoids the generation of waste liquid from the source, and the raw material recovery rate is high. Traditional solid-solid doping uses one-time mixing to mechanically mix and introduce doping substances. For example, patent CN117026045A proposes a hafnium oxide co-doped tungsten alloy and its preparation method. The raw materials are mixed by mechanical alloying to obtain a mixed powder, and the hafnium oxide co-doped tungsten alloy is obtained by sintering and hot processing. This process has few steps and is simple to operate, but it is easy to have uneven distribution of doping elements in tungsten, making it difficult to achieve the effect of dispersed phase strengthening. Therefore, it is urgent to provide a new process to improve this problem. In addition, the tungsten-containing raw materials used in the current solid-solid doping process are mostly tungsten powder. There has been no report on the use of ammonium paratungstate (APT) as a tungsten raw material and the use of a solid-solid doping process to prepare rare earth-doped tungsten powder for diamond wire by rare earth doping APT. Rare earth-doped tungsten powder is prepared by directly doping rare earths with APT as a tungsten source. The prepared doped tungsten powder has the advantage of good formability, which lays the foundation for the subsequent preparation of tungsten wire for diamond wire with a high yield and high tensile strength, good flexibility and processing performance. However, using solid-phase APT as a tungsten source has the defect of uneven distribution of rare earth elements in tungsten. Summary of the invention

[0003] In order to solve the problems existing in the prior art, the main purpose of the present invention is to provide a rare earth-doped tungsten powder for preparing diamond wire and a preparation method thereof.

[0004] To solve the above technical problems, according to one aspect of the present invention, the present invention provides the following technical solutions:

[0005] A method for preparing rare earth-doped tungsten powder for preparing diamond wire comprises the following steps:

[0006] S1. Weigh a certain amount of rare earth metal salt and APT;

[0007] S2, mechanically mixing the rare earth metal salt and APT in multiple steps to obtain a mixed powder;

[0008] S3, calcining the mixed powder obtained after mechanical mixing;

[0009] S4. The calcined powder is reduced to obtain rare earth-doped tungsten powder for preparing diamond wire.

[0010] As a preferred embodiment of the method for preparing rare earth-doped tungsten powder for diamond wire described in the present invention, wherein: in the step S1, the mass ratio of the rare earth metal salt to APT is (0.1-5):100.

[0011] As a preferred embodiment of the method for preparing rare earth-doped tungsten powder for diamond wire described in the present invention, wherein: in the step S1, the rare earth metal salt is at least one of rare earth carbonates and rare earth nitrates; the rare earth carbonate is at least one of cerium carbonate, yttrium carbonate, lanthanum carbonate, europium carbonate, gadolinium carbonate, and scandium carbonate; the rare earth nitrate is at least one of cerium nitrate, yttrium nitrate, lanthanum nitrate, europium nitrate, gadolinium nitrate, and scandium nitrate.

[0012] As a preferred embodiment of the method for preparing rare earth-doped tungsten powder for diamond wire described in the present invention, wherein: in the step S2, the number of times of mechanical mixing in steps is 2 to 10 times, and the mechanical mixing method is grinding or ball milling.

[0013] As a preferred embodiment of the method for preparing rare earth-doped tungsten powder for diamond wire described in the present invention, wherein: in the step S2, the grinding time is 0.5 to 3 hours; the ball milling process parameters are: the ball-to-material ratio is (1 to 10): 1, the rotation speed is 300 to 400 r / min, and the single ball milling time is 0.5 to 3 hours.

[0014] As a preferred embodiment of the method for preparing rare earth-doped tungsten powder for diamond wire described in the present invention, in step S2, the multiple mechanical mixing is specifically as follows: the first mechanical mixing is to mix all the rare earth metal salts with part of APT, and then part of APT is added to the previously mixed powder again for mixing until all the APT is mixed.

[0015] As a preferred embodiment of the method for preparing rare earth-doped tungsten powder for diamond wire described in the present invention, wherein: in the step S2, the mass ratio of the rare earth metal salt to APT during the first mechanical mixing is 1:(1-10), and during subsequent mixing, the mass ratio of the previously mixed powder to the re-added portion of APT is 1:3-4.5:1.

[0016] As a preferred embodiment of the method for preparing rare earth-doped tungsten powder for diamond wire described in the present invention, in step S3, the powder is calcined in a box-type resistance furnace at a temperature of 600 to 1200° C. for a calcination time of 0.5 to 4 hours.

[0017] As a preferred embodiment of the method for preparing rare earth-doped tungsten powder for diamond wire described in the present invention, wherein: in the step S4, the reduction is carried out in a hydrogen-based reduction furnace, the reduction temperature is 700-1300° C., and the reduction time is 0.5-4 hours.

[0018] To solve the above technical problem, according to another aspect of the present invention, the present invention provides the following technical solution:

[0019] A rare earth doped tungsten powder for preparing diamond wire is prepared by adopting the preparation method of the rare earth doped tungsten powder for preparing diamond wire.

[0020] As a preferred solution for preparing rare earth-doped tungsten powder for diamond wire described in the present invention, the average particle size of the rare earth-doped tungsten powder for diamond wire is ≤2.5μm, and the surface of the rare earth-doped tungsten powder for diamond wire is smooth and has good consistency.

[0021] To solve the above technical problem, according to another aspect of the present invention, the present invention provides the following technical solution:

[0022] A tungsten diamond wire is prepared by using the above-mentioned rare earth-doped tungsten powder for preparing diamond wire as raw material, and the finished product rate of the 35μm drawn wire diameter is ≥88%, and the tensile strength of the 35μm tungsten diamond wire is ≥6800MPa.

[0023] The beneficial effects of the present invention are as follows:

[0024] The present invention provides a rare earth doped tungsten powder for preparing diamond wire and a preparation method thereof, wherein APT and rare earth metal salt are mixed and roasted in multiple steps to be converted into a composite oxide precursor with fine particle size and uniform mixing, and the precursor is reduced under certain conditions to obtain metal tungsten, and rare earth oxides with good thermal stability still exist in the form of oxides, thereby obtaining rare earth doped tungsten powder. The present invention broadens the raw materials and processes of rare earth doped tungsten powder for diamond wire, and the preparation method does not generate waste liquid and waste gas, and solves the uniformity problem of solid-solid doping by quantitatively mixing in multiple steps, and easily realizes uniform mixing and dispersion of finer particles, and prepares doped tungsten powder with fine particle size and uniform composition, which has broad application prospects in practical applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0026] Figure 1This is a scanning electron microscope image of the rare earth-doped tungsten powder for diamond wire prepared in Example 1 of the present invention.

[0027] Figure 2 This is a scanning electron microscope image of the rare earth-doped tungsten powder for diamond wire prepared in Example 2 of the present invention.

[0028] Figure 3 This is a scanning electron microscope image of the rare earth-doped tungsten powder for diamond wire prepared in Comparative Example 1.

[0029] Figure 4 This is a scanning electron microscope image of the rare earth-doped tungsten powder for diamond wire prepared in Comparative Example 2.

[0030] Figure 5 This is a scanning electron microscope image of the rare earth-doped tungsten powder for diamond wire prepared in Comparative Example 3.

[0031] The realization of the effects, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0032] The following will be described clearly and completely in conjunction with the technical solutions in the embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] According to one aspect of the present invention, the present invention provides the following technical solution:

[0034] A method for preparing rare earth-doped tungsten powder for preparing diamond wire comprises the following steps:

[0035] S1. Weigh a certain amount of rare earth metal salt and APT;

[0036] S2, mechanically mixing the rare earth metal salt and APT in multiple steps to obtain a mixed powder;

[0037] S3, calcining the mixed powder obtained after mechanical mixing;

[0038] S4. The calcined powder is reduced to obtain rare earth-doped tungsten powder for preparing diamond wire.

[0039] Preferably, in step S1, the mass ratio of the rare earth metal salt to APT is (0.1-5): 100. Specifically, the mass ratio of the rare earth metal salt to APT can be, for example, any one of 0.1:100, 0.2:100, 0.5:100, 1.0:100, 2.0:100, 3.0:100, 4.0:100, 5.0:100, or a range between any two thereof.

[0040] Preferably, in step S1, the rare earth metal salt is at least one of rare earth carbonate and rare earth nitrate; the rare earth carbonate is at least one of cerium carbonate, yttrium carbonate, lanthanum carbonate, europium carbonate, gadolinium carbonate and scandium carbonate; the rare earth nitrate is at least one of cerium nitrate, yttrium nitrate, lanthanum nitrate, europium nitrate, gadolinium nitrate and scandium nitrate.

[0041] Preferably, in step S2, the number of step-by-step mechanical mixing is 2 to 10 times, the mechanical mixing method is grinding or ball milling, and the grinding time is 0.5 to 3 hours; the ball milling process parameters are: ball-to-material ratio is (1 to 10): 1, the rotation speed is 300 to 400 r / min, and the single ball milling time is 0.5 to 3 hours.

[0042] Preferably, in step S2, the multiple mechanical mixing is specifically as follows: the first mechanical mixing is to mix all the rare earth metal salts with part of the APT, and then part of the APT is added to the previously mixed powder again for mixing, until all the APT is mixed.

[0043] Preferably, in step S2, the mass ratio of the rare earth metal salt to APT during the first mechanical mixing is 1:(1-10), and during the subsequent mixing, the mass ratio of the previously mixed powder to the re-added portion of APT is 1:3-4.5:1. Specifically, the mass ratio of the rare earth metal salt to APT during the first mechanical mixing can be, for example, any one of 1:1, 1:2, 1:3, 1:4, 1:5, 1:6, 1:7, 1:8, 1:9, 1:10 or a range between any two of them; the mass ratio of the previously mixed powder to the re-added portion of APT can be, for example, any one of 1:3, 2:3, 1:1, 2:1, 3:1, 4:1, 4.5:1 or a range between any two of them.

[0044] Preferably, in step S3, the calcination is carried out in a box-type resistance furnace at a temperature of 600 to 1200° C., preferably 750 to 950° C., and a calcination time of 0.5 to 4 hours, preferably 1 to 3 hours.

[0045] Preferably, in step S4, the reduction is carried out in a hydrogen-based reduction furnace, the reduction temperature is 700-1300° C., preferably 800-1100° C., and the reduction time is 0.5-4 h, preferably 1-3 h.

[0046] According to another aspect of the present invention, the present invention provides the following technical solution:

[0047] A rare earth doped tungsten powder for preparing diamond wire is prepared by the above-mentioned preparation method of rare earth doped tungsten powder for diamond wire; the average particle size of the rare earth doped tungsten powder for diamond wire is ≤2.5μm, and the surface of the rare earth doped tungsten powder for diamond wire is smooth and has good consistency.

[0048] To solve the above technical problem, according to another aspect of the present invention, the present invention provides the following technical solution:

[0049] A tungsten diamond wire is prepared by using the above-mentioned rare earth-doped tungsten powder for preparing diamond wire as raw material, and the finished product rate of the 35μm drawn wire diameter is ≥88%, and the tensile strength of the 35μm tungsten diamond wire is ≥6800MPa.

[0050] The technical solution of the present invention is further described below in conjunction with specific embodiments.

[0051] Example 1

[0052] A method for preparing rare earth-doped tungsten powder for preparing diamond wire comprises the following steps:

[0053] S1, weigh 1.4g cerium carbonate and 150g APT;

[0054] S2. Mechanically mix cerium carbonate and APT in 5 steps to obtain mixed powder; the amount of APT added during each grinding is 10g, 20g, 30g, 30g, and 60g respectively, and all the cerium carbonate is added during the first grinding and mixing, and the grinding time for each time is 1h.

[0055] S3, roasting the mixed powder obtained after mechanical mixing in a box-type resistance furnace at a roasting temperature of 750° C. for 3 h;

[0056] S4. The calcined powder is reduced in a hydrogen-based reduction furnace at a reduction temperature of 1000° C. for a reduction time of 2 h to obtain rare earth-doped tungsten powder for preparing diamond wire.

[0057] The scanning electron microscope image of the rare earth-doped tungsten powder for preparing diamond wire prepared in this embodiment is as follows: Figure 1 As shown, the average particle size is 1.88μm and the rare earth Ce content is 0.62wt%; the tungsten wire diamond wire is prepared by using the above-mentioned rare earth-doped tungsten powder for preparing diamond wire as raw material, and the finished product rate of 35μm drawn wire diameter is 89%, and the tensile strength of 35μm tungsten wire diamond wire is 6890MPa.

[0058] Example 2

[0059] A method for preparing rare earth-doped tungsten powder for preparing diamond wire comprises the following steps:

[0060] S1, weigh 1.2g cerium nitrate, 1.5g lanthanum carbonate, 200g APT;

[0061] S2. Mechanically mix cerium nitrate, lanthanum carbonate and APT in 8 steps to obtain a mixed powder; the amount of APT added in each ball milling is 5g, 10g, 15g, 20g, 20g, 30g, 40g and 60g respectively, cerium nitrate and lanthanum carbonate are all added during the first ball milling, the ball-to-material ratio during ball milling is 5:1, the rotation speed is 350r / min, and the single ball milling time is 0.5h.

[0062] S3, roasting the mixed powder obtained after mechanical mixing in a box-type resistance furnace at a roasting temperature of 950° C. for 2 h;

[0063] S4. The calcined powder is reduced in a hydrogen-based reduction furnace at a reduction temperature of 850° C. for a reduction time of 2 h to obtain rare earth-doped tungsten powder for preparing diamond wire.

[0064] The scanning electron microscope image of the rare earth-doped tungsten powder for preparing diamond wire prepared in this embodiment is as follows: Figure 2 As shown, its average particle size is 1.96μm, the rare earth Ce content is 0.41wt%, and the rare earth La content is 0.50wt%; the tungsten wire diamond wire is prepared by using the above-mentioned rare earth-doped tungsten powder for preparing diamond wire as raw material, and the finished product rate of 35μm drawn wire diameter is 91%, and the tensile strength of 35μm tungsten wire diamond wire is 7100MPa.

[0065] Example 3

[0066] A method for preparing rare earth-doped tungsten powder for preparing diamond wire comprises the following steps:

[0067] S1. Weigh 0.4 g of gadolinium nitrate and 60 g of APT;

[0068] S2. Mechanically mix gadolinium nitrate and APT in three steps to obtain a mixed powder; the amount of APT added during each grinding is 4g, 26g, and 30g respectively, and all of the gadolinium nitrate is added during the first grinding and mixing. The grinding time for each time is 0.5h.

[0069] S3, roasting the mixed powder obtained after mechanical mixing in a box-type resistance furnace at a roasting temperature of 800° C. for 1 h;

[0070] S4. The calcined powder is reduced in a hydrogen-based reduction furnace at a reduction temperature of 750° C. for 4 hours to obtain rare earth-doped tungsten powder for preparing diamond wire.

[0071] The average particle size of the rare earth-doped tungsten powder for preparing diamond wire prepared in this embodiment is 2.18μm, and the rare earth Gd content is 0.47wt%; the tungsten wire diamond wire is prepared by using the above-mentioned rare earth-doped tungsten powder for preparing diamond wire as raw material, and the finished product rate of 35μm drawn wire diameter is 88%, and the tensile strength of 35μm tungsten wire diamond wire is 6850MPa.

[0072] Example 4

[0073] A method for preparing rare earth-doped tungsten powder for preparing diamond wire comprises the following steps:

[0074] S1. Weigh 2.15 g europium carbonate, 3.88 g yttrium nitrate, and 350 g APT;

[0075] S2. Mechanically mix europium carbonate, yttrium nitrate and APT in 6 steps to obtain a mixed powder; the amount of APT added during each ball milling is 10g, 20g, 30g, 50g, 90g and 150g respectively, europium carbonate and yttrium nitrate are all added during the first ball milling, the ball-to-material ratio during ball milling is 3:1, the rotation speed is 400r / min, and the single ball milling time is 1.0h.

[0076] S3, roasting the mixed powder obtained after mechanical mixing in a box-type resistance furnace at a roasting temperature of 950° C. for 2 h;

[0077] S4. The calcined powder is reduced in a hydrogen-based reduction furnace at a reduction temperature of 850° C. for a reduction time of 2 h to obtain rare earth-doped tungsten powder for preparing diamond wire.

[0078] The average particle size of the rare earth-doped tungsten powder for preparing diamond wire prepared in this embodiment is 2.29μm, the rare earth Eu content is 0.39wt%, and the rare earth Y content is 0.67wt%; the tungsten wire diamond wire is prepared by using the above-mentioned rare earth-doped tungsten powder for preparing diamond wire as raw material, and the finished product rate of 35μm drawn wire diameter is 93%, and the tensile strength of 35μm tungsten wire diamond wire is 6900MPa.

[0079] Comparative Example 1

[0080] The difference from Example 2 is that 5 g of cerium nitrate, 10 g of lanthanum carbonate and 200 g of APT are weighed; the cerium nitrate, lanthanum carbonate and APT are mechanically mixed 8 times in steps to obtain a mixed powder; the amount of APT added during each ball milling is 15 g, 10 g, 15 g, 20 g, 20 g, 30 g, 30 g and 60 g respectively.

[0081] The scanning electron microscope image of the doped tungsten powder prepared in this comparative example is as follows: Figure 3 As shown, this comparative example increases the amount of rare earth compared to Example 2, and the particle size of the prepared doped tungsten powder is too large and there is serious agglomeration, the average particle size is 3.66μm, the rare earth Ce content is 1.60wt%, and the rare earth La content is 3.32wt%; the tungsten diamond wire is prepared using the above-mentioned doped tungsten powder as raw material, and the finished product rate of 35μm drawn wire diameter is 68%, and the tensile strength of 35μm tungsten diamond wire is 5700MPa.

[0082] Comparative Example 2

[0083] The difference from Example 1 is that the amount of APT added during each grinding is 2 g, 17 g, 110 g, 6 g, and 15 g respectively.

[0084] The scanning electron microscope image of the doped tungsten powder prepared in this comparative example is as follows: Figure 4 As shown, in this comparative example, the mixing ratio is changed, and the prepared doped tungsten powder has irregular large-sized particles, the average particle size of which is 1.79μm, and the rare earth Ce content is 0.48wt%; the tungsten diamond wire is prepared using the above-mentioned doped tungsten powder as raw material, and the finished product rate of 35μm drawn wire diameter is 42%, and the tensile strength of 35μm tungsten diamond wire is 6000MPa.

[0085] Comparative Example 3

[0086] The difference from Example 1 is that cerium carbonate and APT are mechanically mixed once to obtain a mixed powder, and the grinding time is 5 hours.

[0087] The scanning electron microscope image of the doped tungsten powder prepared in this comparative example is as follows: Figure 5 As shown, the doped tungsten powder prepared by one-time mixing in this comparative example has particles of various shapes, with an average particle size of 3.05μm and a rare earth La content of 0.53wt%; tungsten diamond wire is prepared using the above-mentioned doped tungsten powder as raw material, and the finished product rate of 35μm drawn wire diameter is 45%, and the tensile strength of 35μm tungsten diamond wire is 4900MPa.

[0088] It can be seen from the above embodiments and comparative examples that APT and rare earth metal salts are mixed and calcined in multiple steps to convert into a fine-particle-sized and uniformly mixed composite oxide precursor, which is reduced under certain conditions to obtain metallic tungsten, and rare earth oxides with good thermal stability still exist in the form of oxides, thereby obtaining rare earth-doped tungsten powder. The present invention broadens the raw materials and processes of rare earth-doped tungsten powder for diamond wires, and the preparation method does not generate waste liquid and waste gas. The uniformity problem of solid-solid doping is solved by quantitatively mixing in multiple steps, and it is easy to achieve uniform mixing and dispersion of finer particles, and prepare doped tungsten powder with fine particle size and uniform composition, which has broad application prospects in practical applications.

[0089] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A method for preparing tungsten diamond wire, characterized in that: Tungsten diamond wire is prepared by using rare earth doped tungsten powder for preparing diamond wire as raw material, and the finished product rate of 35μm drawn wire diameter is ≥88%, and the tensile strength of 35μm tungsten diamond wire is ≥6800MPa; The method for preparing rare earth-doped tungsten powder for preparing diamond wire comprises the following steps: S1. Weigh a certain amount of rare earth metal salt and APT, wherein the mass ratio of the rare earth metal salt to APT is (0.1-5):100; S2, mechanically mixing the rare earth metal salt and APT in multiple steps to obtain a mixed powder; the multiple step mechanical mixing is specifically: the first mechanical mixing is to mix all the rare earth metal salt and part of the APT, and then add part of the APT to the previously mixed powder again to mix until all the APT is mixed; the mass ratio of the rare earth metal salt to APT during the first mechanical mixing is 1: (1-10), and during the subsequent mixing, the mass ratio of the previously mixed powder to the part of the APT added again is 1: 3-4.5: 1; S3, calcining the mixed powder obtained after mechanical mixing at a temperature of 600-1200° C.; S4. The calcined powder is reduced at a reduction temperature of 700-1300° C. to obtain rare earth-doped tungsten powder for preparing diamond wire. The average particle size of the rare earth-doped tungsten powder for preparing diamond wire is ≤2.5 μm.

2. The method for preparing tungsten diamond wire according to claim 1, characterized in that: In step S1, the rare earth metal salt is at least one of rare earth carbonate and rare earth nitrate; the rare earth carbonate is at least one of cerium carbonate, yttrium carbonate, lanthanum carbonate, europium carbonate, gadolinium carbonate, and scandium carbonate; the rare earth nitrate is at least one of cerium nitrate, yttrium nitrate, lanthanum nitrate, europium nitrate, gadolinium nitrate, and scandium nitrate.

3. The method for preparing tungsten diamond wire according to claim 1, characterized in that: In step S2, the number of times of mechanical mixing in steps is 2 to 10 times, and the mechanical mixing method is grinding or ball milling.

4. The method for preparing tungsten diamond wire according to claim 3, characterized in that: In the step S2, the grinding time is 0.5 to 3 hours; the ball milling process parameters are: ball-to-material ratio is (1 to 10): 1, the rotation speed is 300 to 400 r / min, and the single ball milling time is 0.5 to 3 hours.

5. The method for preparing tungsten diamond wire according to claim 1, characterized in that: In the step S3, the sintered product is calcined in a box-type resistance furnace for a calcination time of 0.5 to 4 hours.

6. The method for preparing tungsten diamond wire according to claim 1, characterized in that: In the step S4, reduction is carried out in a hydrogen-based reduction furnace, and the reduction time is 0.5 to 4 hours.

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