CN115976387A - High-strength tungsten alloy wire and preparation method thereof - Google Patents

High-strength tungsten alloy wire and preparation method thereof Download PDF

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CN115976387A
CN115976387A CN202310096216.1A CN202310096216A CN115976387A CN 115976387 A CN115976387 A CN 115976387A CN 202310096216 A CN202310096216 A CN 202310096216A CN 115976387 A CN115976387 A CN 115976387A
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alloy wire
temperature
tungsten alloy
strength
tungsten
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CN115976387B (en
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李易凌
姜海
叶琴
朱玉祥
郑坤坤
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Zhenjiang Yuanshi Novel Material Co ltd
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Abstract

The invention discloses a tungsten alloy wire with high strength and a preparation method thereof, wherein 0.5-1.5wt% of the tungsten alloy wire is lanthanum, 0.1-1.0wt% of the tungsten alloy wire is cobalt or iron, and the balance is tungsten, the strength of the tungsten alloy wire is higher than 7000Mpa at room temperature and higher than 5000Mpa at 350 ℃, the wire breakage rate in the drawing process is lower than 2%, and the tungsten alloy wire has the advantages of high strength, high production yield and the like.

Description

High-strength tungsten alloy wire and preparation method thereof
Technical Field
The invention relates to a tungsten alloy wire and a preparation method thereof, in particular to a tungsten alloy wire with high strength and a preparation method thereof.
Background
Tungsten and its alloy have the advantages of high elastic modulus, high conductivity, high strength and good toughness and plasticity. Compared with a carbon steel wire saw, the diamond wire saw made of the tungsten alloy wire has the advantages of high thinning degree, small cutting loss, high yield and the like. The production technology of the raw material wire rod of the carbon steel diamond wire which is common in the market at present is monopolized in Japan, and the carbon steel diamond wire cannot be made in China at present, but the preparation technology of the tungsten alloy wire has a mature technology in China and can realize large-scale mass production, so that the development of the tungsten alloy wire diamond wire can not only improve the capacity and the quality, but also solve the problem of material supply.
Although the pure tungsten wire can be drawn to be less than 10 mu m, the strength is low, the pure tungsten wire cannot be used for producing diamond wires, other elements are required to be added to improve the performance, common added elements such as rhenium, molybdenum, cobalt, chromium, iron and the like can improve the strength to be more than 6000MPa, and if the strength is improved by changing a drawing die chain, wire breakage is easily caused in the drawing process, and certain problems exist.
Disclosure of Invention
The purpose of the invention is as follows: the invention aims to provide a tungsten alloy wire with low wire breakage rate in drawing and high strength; the invention also aims to provide a preparation method of the tungsten alloy wire.
The technical scheme is as follows: the high-strength tungsten alloy wire comprises 0.5-1.5wt% of lanthanum, 0.1-1.0wt% of cobalt or iron and the balance of tungsten, wherein the strength of the tungsten alloy wire is higher than 7000Mpa at the temperature of 0-40 ℃, the strength of the tungsten alloy wire is higher than 6000Mpa at the temperature of 40-200 ℃, the strength of the tungsten alloy wire is higher than 5500Mpa at the temperature of 200-300 ℃, and the strength of the tungsten alloy wire is higher than 5000Mpa at the temperature of 300-350 ℃.
Furthermore, the diameter of the tungsten alloy wire is 15-45 μm.
The preparation process of the tungsten alloy wire comprises the following steps:
(1) Preparing an alloy rod: mixing single metal powder according to the mass ratio of each element in the components of the alloy wire, then putting the mixture into a mould, and performing hot isostatic pressing twice to obtain an alloy rod;
(2) Carrying out rotary swaging to process an alloy rod;
(3) Drawing at 600-2500 deg.C;
(4) Low-temperature drawing is carried out at 200-350 ℃.
Further, the purity of the elementary metal powder in the step (1) is higher than 99.9%, and the particle size is 3-4 μm.
Further, the swaging temperature in the step (2) is 1400-1450 ℃.
Further, in the high-temperature drawing process in the step (3), the strength of the tungsten alloy wire is 50-70Mpa at 2300-2500 ℃, and is 200-1000Mpa at 10-40 ℃.
Further, the low-temperature drawing annealing in the step (4) adopts a step-type temperature rise, and the temperature rise rate is as follows: room temperature-500 deg.C: 100 ℃/min;500-750 ℃:80 ℃/min;750-800 ℃:50 ℃/min, and the total time is 30-45 minutes.
Further, the low-temperature drawing in the step (4) is carried out for 2 times of 45-60 times of drawing, and annealing treatment is carried out between two times of drawing at the temperature of 750-800 ℃.
Has the advantages that: compared with the prior art, the invention has the following remarkable advantages:
(1) The high-temperature strength is high, and the strength is higher than 5000Mpa at 300-350 ℃;
(2) The drawing broken wire rate is lower than 2 percent;
(3) The strength at room temperature exceeds 7000MPa, and higher cutting tension can be used after the diamond wire is manufactured;
(4) Can be processed to the diameter of 15 mu m, and reduces the cutting loss.
Detailed Description
The technical solution of the present invention is further illustrated by the following examples.
Example 1
The alloy of the embodiment comprises W-1La-1Co (lanthanum: 1.0wt%, cobalt: 1.0wt%, and tungsten in balance), the breaking force is 5.1N after being processed into a 15 μm alloy wire, the strength at room temperature is 7215Mpa actually measured, and the wire breakage rate in drawing is 1.2%.
The preparation method of the tungsten alloy wire comprises the following steps:
(1) Preparing an alloy rod: according to the mass ratio of each element in the components of the alloy wire, mixing pure metal powder with the purity higher than 99.9% and the grain diameter of 3-4 mu m, then putting the mixture into a steel mould with the diameter of 100mm, and carrying out hot isostatic pressing twice at 1200 ℃ and 1800 ℃ to obtain an alloy rod with the diameter of 35 mm;
(2) Rotary swaging: the rotary swaging temperature is 1400-1450 ℃, the total pass is 20, and the diameter of the alloy rod is processed from 35mm to 9mm by rotary swaging;
(3) High-temperature drawing: the drawing is carried out for 6 times and 40 times, the drawing is carried out for the first time from 9mm to 8mm at the temperature of 2450 ℃ for 1 time, the strength is higher than 50MPa at the temperature, and the strength is higher than 200MPa at room temperature after the drawing. Drawing from 8mm to 6mm for the second time at 700 ℃ for 10 times. Drawing from 6mm to 5mm for the third time at 2400 deg.C for 1 pass, wherein the strength is higher than 60MPa, and the strength is higher than 500MPa at room temperature after drawing. Drawing from 5mm to 3mm for the fourth time at 650 ℃ for 12 times. Drawing for the fifth time from 3mm to 2mm at 2350 deg.C for 1 time, wherein the strength is higher than 70MPa, and the strength at room temperature after drawing is higher than 1000MPa. Drawing the steel wire from 2mm to 0.60mm for the sixth time at 600 ℃ for 15 times;
(4) Low-temperature drawing: carrying out 45-60-pass drawing for 2 times, firstly drawing from 0.60mm to 0.15mm for 30 passes at 350 ℃, then carrying out primary annealing treatment at 800 ℃, adopting step-type temperature rise, wherein the temperature rise rate is as follows: room temperature-500 deg.C: 100 ℃/min;500-750 deg.C: 80 ℃/min;750-800 ℃:50 ℃/min, the total time is 30 minutes. After annealing, the steel is drawn from 0.15mm to less than 0.045mm for 15 to 30 times, and the temperature is 200 to 300 ℃.
Example 2
The alloy of the embodiment comprises W-0.7La-1Fe (lanthanum: 0.7wt%, iron: 1.0wt%, and the balance tungsten), the breaking force is 5.0N after being processed into alloy wires with the diameter of 15 mu m, the actual measured strength is 7073Mpa, and the drawing wire breakage rate is 1.8%.
(1) Preparing an alloy rod: according to the mass ratio of each element in the components of the alloy wire, mixing powder with purity higher than 99.9% and grain size of 3-4 μm, then placing the mixture into a steel mould with the diameter of 100mm, and carrying out hot isostatic pressing twice at 1200 ℃ and 1800 ℃ to obtain an alloy rod with the diameter of 35 mm;
(2) Rotary swaging: the rotary swaging temperature is 1400-1450 ℃, the total pass is 20, and the diameter of the alloy rod is processed from 35mm to 9mm by rotary swaging;
(3) High-temperature drawing: the drawing is carried out for 6 times and 40 times, the drawing is carried out for the first time from 9mm to 8mm at the temperature of 2450 ℃ for 1 time, the strength is higher than 50MPa at the temperature, and the strength is higher than 200MPa at room temperature after the drawing. Drawing from 8mm to 6mm for the second time at 700 ℃ for 10 times. Drawing from 6mm to 5mm for the third time at 2400 deg.C for 1 pass, wherein the strength is higher than 60MPa, and the strength is higher than 500MPa at room temperature after drawing. Drawing from 5mm to 3mm for the fourth time at 650 ℃ for 12 times. Drawing for the fifth time from 3mm to 2mm at 2350 deg.C for 1 time, wherein the strength is higher than 70MPa, and the strength at room temperature after drawing is higher than 1000MPa. Drawing from 2mm to 0.60mm for the sixth time at 600 ℃ for 15 times;
(4) Low-temperature drawing: carrying out 45-60-pass drawing for 2 times, firstly drawing from 0.60mm to 0.15mm for 30 passes at 350 ℃, then carrying out primary annealing treatment at 800 ℃, adopting step-type temperature rise, wherein the temperature rise rate is as follows: room temperature-500 deg.C: 100 ℃/min;500-750 ℃:80 ℃/min;750-800 ℃:50 ℃/min, and the total time length is 30 minutes. After annealing, the steel is drawn from 0.15mm to less than 0.045mm for 15 to 30 times, and the temperature is 200 to 300 ℃.
Comparative example 1
The alloy composition of this application example was W-1Re-1Co (Re: 0.7wt%, co: 1.0wt%, balance W), the breaking force after processing into 15 μm alloy wire was 4.5N, the measured strength was 6366MPa, and the wire breakage rate by drawing was 4.1%.
Comparative example 2
The alloy composition of the application example is high-carbon steel wire containing 0.92wt% of carbon, the breaking force is 6.2N after the steel wire is processed to be 40 mu m, the actual measured strength is 4933Mpa, and the drawing wire breakage rate is 5.2%.
After preparing diamond wires from examples 1 to 4, M10-sized silicon wafers were cut, respectively, with the cutting tension set at 3.0N and the number of cuts set at not less than 100, and the results are shown in Table 1.
TABLE 1
Figure BDA0004071736350000041
As can be seen from Table 1, the ultra-high strength tungsten alloy wire containing lanthanum has low breakage rate and high strength in the drawing production process, has low loss and high yield of products after being manufactured into a wire saw, and meets the requirements of high quality, high efficiency and low loss.

Claims (9)

1. A tungsten alloy wire with high strength is characterized in that: the components of the alloy comprise 0.5-1.5wt% of lanthanum, 0.1-1.0wt% of cobalt or iron and the balance of tungsten; the strength of the tungsten alloy wire is higher than 7000Mpa at the temperature of 0-40 ℃, higher than 6000Mpa at the temperature of 40-200 ℃, higher than 5500Mpa at the temperature of 200-300 ℃ and higher than 5000Mpa at the temperature of 300-350 ℃.
2. The tungsten alloy wire according to claim 1, wherein: the diameter is 15-45 μm.
3. A method for producing the tungsten alloy wire according to claim 1 or 2, characterized in that: the method comprises the following steps:
(1) Preparing an alloy rod: mixing single metal powder according to the mass ratio of each element in the components of the alloy wire, then putting the mixture into a mould, and performing hot isostatic pressing twice to obtain an alloy rod;
(2) Carrying out rotary swaging to process an alloy rod;
(3) Drawing at 600-2500 deg.C;
(4) Low-temperature drawing is carried out at 200-350 ℃.
4. The method for producing a tungsten alloy wire according to claim 3, wherein: the purity of the simple substance metal powder in the step (1) is higher than 99.9%, and the particle size is 3-4 μm.
5. The method for producing a tungsten alloy wire according to claim 3, wherein: the rotary swaging temperature in the step (2) is 1400-1450 ℃.
6. The method for producing a tungsten alloy wire according to claim 3, wherein: in the high-temperature drawing process in the step (3), the strength of the tungsten alloy wire is 50-70Mpa at 2300-2500 ℃, and is 200-1000Mpa at 10-40 ℃.
7. The method for producing a tungsten alloy wire according to claim 3, wherein: in the step (4), the low-temperature drawing annealing adopts step-type heating, and the heating rate is as follows: room temperature-500 deg.C: 100 ℃/min;500-750 ℃:80 ℃/min;750-800 ℃:50 ℃/min, and the total time is 30-45 minutes.
8. The method for producing a tungsten alloy wire according to claim 3, wherein: and (4) carrying out 45-60-pass drawing for 2 times in total in the low-temperature drawing process.
9. The method for producing a tungsten alloy wire according to claim 3, wherein: in the low-temperature drawing process in the step (4), annealing treatment is performed for one time between two times of drawing, and the temperature is 750-800 ℃.
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