Method for improving mixing uniformity of tungsten powder and element powder

Abstract

The invention belongs to the technical field of powder materials, and provides a method for improving the mixing uniformity of tungsten powder and element powder, and the method comprises the following steps: mixing the tungsten powder and the element powder, carrying out ball milling, and then carrying out ultrasonic cleaning to obtain first powder; sequentially carrying out three-dimensional mixing and ultrasonic cleaning on the first powder to obtain second powder; the second powder is subjected to double-cone mixing, and treatment is completed. Tungsten powder and element powder are mixed and then subjected to ball milling, different powder bodies are dispersed, and large particles are prevented from being agglomerated. Then, the mixed powder is cleaned in an ultrasonic cleaning mode, and a uniformly mixed system is obtained under the ultrasonic effect; under the action of three-dimensional mixing, mixed materials are accelerated to flow and diffuse, and agglomeration and accumulation caused by conventional mixing are avoided; and finally, under the action of double-cone mixing, the powder performs turbulent flow movement in the machine, and the materials are efficiently and uniformly mixed through complex impact, so that the tungsten powder and the element powder are mixed.

Description

Technical Field

[0001] The invention relates to the technical field of powder materials, and in particular to a method for improving the mixing uniformity of tungsten powder and element powder. Background Art

[0002] With the development of cemented carbide industry, the requirements for alloy raw materials are getting higher and higher, and it is necessary to improve the uniformity of powder particle size. Tungsten, as a metal element, is mainly added to superhard alloys to improve performance. The quality of tungsten powder directly determines the performance of the alloy, and tungsten powder with uniform coarseness and fineness once became the primary requirement of the metallurgical industry. However, in subsequent processing, it was found that the mixing of multiple powders would lead to the cohesion of the powders, making the composition of the alloy uneven, which would have a great impact on the appearance and even performance. In order to overcome the cohesion of the powders, researchers used high-energy ball milling to disperse them, but long-term ball milling would result in excess components and affect the performance of the alloy. Therefore, how to improve the uniformity of tungsten powder and other element powders has become an urgent problem to be solved. Summary of the invention

[0003] The purpose of the present invention is to overcome the defects in the prior art and provide a method for improving the mixing uniformity of tungsten powder and element powder.

[0004] In order to achieve the above-mentioned object of the invention, the present invention provides the following technical solutions:

[0005] The present invention provides a method for improving the mixing uniformity of tungsten powder and element powder, comprising the following steps:

[0006] (1) mixing tungsten powder and element powder, ball milling and ultrasonic cleaning to obtain a first powder;

[0007] (2) performing three-dimensional mixing and ultrasonic cleaning on the first powder in sequence to obtain a second powder;

[0008] (3) The second powder is subjected to double cone mixing to complete the process.

[0009] Preferably, the ball-to-material ratio of the ball mill in step (1) is 4 to 6:1, and the filling rate is 30 to 50%.

[0010] Preferably, the linear speed of the ball mill in step (1) is 500 to 1500 mm / s, and the time is 10 to 20 hours.

[0011] Preferably, the solvent for ultrasonic cleaning in step (1) is ethanol or acetone; and the mass ratio of the powder obtained by ball milling to the ultrasonic cleaning solvent is 1:2-4.

[0012] Preferably, the frequency of ultrasonic cleaning in step (1) is 30 to 40 kHz, and the time is 1 to 3 hours.

[0013] Preferably, the rotation speed of the three-dimensional mixing in step (2) is 15 to 25 r / min, and the time is 1 to 2.5 h.

[0014] Preferably, the solvent for ultrasonic cleaning in step (2) is ethanol or acetone; and the mass ratio of the powder obtained by three-dimensional mixing to the ultrasonic cleaning solvent is 1:2-4.

[0015] Preferably, the frequency of the ultrasonic cleaning in step (2) is 30 to 40 kHz, and the time is 1 to 3 hours.

[0016] Preferably, the baffle of the double cone mixing in step (3) is in the shape of a straight line or a cross, and the filling rate is 30-50%.

[0017] Preferably, the baffle width-to-diameter ratio of the double-cone mixing in step (3) is 0.3-0.4, the rotation speed is 30-60 rpm, and the time is 1-2 h.

[0018] The present invention provides a method for improving the mixing uniformity of tungsten powder and element powder, comprising the following steps: mixing tungsten powder and element powder, ball milling and then ultrasonic cleaning to obtain a first powder; performing three-dimensional mixing and ultrasonic cleaning on the first powder in sequence to obtain a second powder; performing double cone mixing on the second powder to complete the treatment. The present invention performs ball milling after mixing tungsten powder and element powder, and the purpose of ball milling is to initially mix, disperse different powders, and prevent large particles from agglomerating. Then, the mixed powder is cleaned by ultrasonic cleaning, and a uniformly mixed system is obtained under the action of ultrasound. After obtaining the first powder, under the action of three-dimensional mixing, the mixed material is accelerated to flow and diffuse, avoiding the agglomeration and accumulation caused by conventional mixing; the repeated ultrasonic cleaning method can improve the uniformity while cleaning the material. Finally, under the action of double cone mixing, the powder performs turbulent motion inside the machine, and through complex collisions, efficient and uniform mixing of the material is achieved, thereby completing the mixing of tungsten powder and element powder. The method provided by the present invention is efficient and can effectively achieve powder mixing based on tungsten powder, greatly improving the uniformity of the mixed system and improving the quality of the product. DETAILED DESCRIPTION

[0019] The present invention provides a method for improving the mixing uniformity of tungsten powder and element powder, characterized in that it comprises the following steps:

[0020] (1) mixing tungsten powder and element powder, ball milling and ultrasonic cleaning to obtain a first powder;

[0021] (2) performing three-dimensional mixing and ultrasonic cleaning on the first powder in sequence to obtain a second powder;

[0022] (3) The second powder is subjected to double cone mixing to complete the process.

[0023] In the present invention, the ball-to-material ratio of the ball mill in step (1) is preferably 4-6:1, more preferably 4.5-5.5:1, and more preferably 4.8-5.2:1; the filling rate is preferably 30-50%, more preferably 35-45%, and more preferably 38-42%.

[0024] In the present invention, the linear speed of the ball mill in step (1) is preferably 500-1500 mm / s, more preferably 600-1400 mm / s, more preferably 800-1200 mm / s; the time is preferably 10-20 h, more preferably 12-18 h, more preferably 14-16 h.

[0025] In the present invention, the solvent for ultrasonic cleaning in step (1) is ethanol or acetone; the mass ratio of the powder obtained by ball milling to the ultrasonic cleaning solvent is preferably 1:2-4, more preferably 1:2.5-3.5, and more preferably 1:2.8-3.2.

[0026] In the present invention, the frequency of ultrasonic cleaning in step (1) is preferably 30 to 40 kHz, more preferably 32 to 38 kHz, and more preferably 34 to 36 kHz; the time is preferably 1 to 3 h, more preferably 1.5 to 2.5 h, and more preferably 1.8 to 2.2 h.

[0027] In the present invention, after ultrasonic cleaning, the filtered system is dried at a temperature of preferably 80 to 100° C., more preferably 85 to 95° C., and more preferably 88 to 92° C.; the system is dried to a constant weight.

[0028] In the present invention, the rotation speed of the three-dimensional mixing in step (2) is preferably 15 to 25 r / min, more preferably 16 to 24 r / min, and more preferably 18 to 22 r / min; the time is preferably 1 to 2.5 h, more preferably 1.5 to 2 h, and more preferably 1.7 to 1.8 h.

[0029] In the present invention, the solvent for ultrasonic cleaning in step (2) is ethanol or acetone; the mass ratio of the powder obtained by three-dimensional mixing to the ultrasonic cleaning solvent is preferably 1:2-4, more preferably 1:2.5-3.5, and more preferably 1:2.8-3.2.

[0030] In the present invention, the frequency of the ultrasonic cleaning in step (2) is preferably 30 to 40 kHz, more preferably 32 to 38 kHz, and more preferably 34 to 36 kHz; the time is preferably 1 to 3 h, more preferably 1.5 to 2.5 h, and more preferably 1.8 to 2.2 h.

[0031] In the present invention, after ultrasonic cleaning, the filtered system is dried at a temperature of preferably 80 to 100° C., more preferably 85 to 95° C., and more preferably 88 to 92° C.; the system is dried to a constant weight.

[0032] In the present invention, the baffle shape of the double cone mixing in step (3) is straight or cross-shaped, and the filling rate is preferably 30-50%, more preferably 35-45%, and more preferably 38-42%.

[0033] In the present invention, the width-to-diameter ratio of the baffle of the double-cone mixing in step (3) is preferably 0.3-0.4, more preferably 0.32-0.38, and more preferably 0.34-0.36; the rotation speed is preferably 30-60 rpm, more preferably 35-55 rpm, and more preferably 40-50 rpm; the time is preferably 1-2 h, more preferably 1.2-1.8 h, and more preferably 1.4-1.6 h.

[0034] The technical solutions provided by the present invention are described in detail below in conjunction with the embodiments, but they should not be construed as limiting the protection scope of the present invention.

[0035] Example 1

[0036] Tungsten powder and carbon powder were mixed, the ball-to-material ratio was controlled to be 5:1, the filling rate was 40%, and the ball milling was performed at a speed of 1000mm / s for 15h; then the ball-milled powder was mixed with ethanol at a mass ratio of 1:3, washed at a frequency of 35kHz for 2h, and the filtered solid was dried at 85℃ to constant weight to obtain the first powder. The first powder was loaded into a three-dimensional mixer, the speed was controlled to be 20r / min, and mixed for 2h; then the three-dimensional mixed powder and ethanol were mixed at a mass ratio of 1:3, washed at a frequency of 32kHz for 1h, and the filtered solid was dried at 85℃ to constant weight to obtain the second powder. Then the second powder was loaded into a double cone mixer, the filling rate was 40%, the baffle was a straight line, the width-to-diameter ratio was 0.32, and the mixture was mixed at a speed of 50rpm for 2h to complete the mixing and obtain a uniform powder.

[0037] Example 2

[0038] Tungsten powder and carbon powder were mixed, the ball-to-material ratio was controlled to be 4:1, the filling rate was 34%, and the ball milling was performed at a speed of 850 mm / s for 12 hours; then the ball-milled powder was mixed with acetone at a mass ratio of 1:2.7, washed at a frequency of 38 kHz for 1 hour, and the filtered solid was dried at 80°C to constant weight to obtain the first powder. The first powder was loaded into a three-dimensional mixer, the speed was controlled to be 18 r / min, and mixed for 1.5 hours; then the three-dimensional mixed powder and ethanol were mixed at a mass ratio of 1:4, washed at a frequency of 35 kHz for 1.8 hours, and the filtered solid was dried at 95°C to constant weight to obtain the second powder. Then the second powder was loaded into a double cone mixer, the filling rate was 38%, the baffle was cross-shaped, the width-to-diameter ratio was 0.37, and it was mixed at a speed of 55 rpm for 1.5 hours to complete the mixing and obtain a uniform powder.

[0039] Example 3

[0040] Tungsten powder and carbon powder were mixed, the ball-to-material ratio was controlled to be 5.5:1, the filling rate was 46%, and the ball milling was performed at a speed of 1200mm / s for 17h; then the ball-milled powder was mixed with acetone at a mass ratio of 1:3.2, washed at a frequency of 36kHz for 2.6h, and the filtered solid was dried at 95℃ to constant weight to obtain the first powder. The first powder was loaded into a three-dimensional mixer, the speed was controlled to be 23r / min, and mixed for 1h; then the three-dimensional mixed powder and ethanol were mixed at a mass ratio of 1:2.5, washed at a frequency of 32kHz for 1h, and the filtered solid was dried at 92℃ to constant weight to obtain the second powder. Then the second powder was loaded into a double cone mixer, the filling rate was 42%, the baffle was cross-shaped, the width-to-diameter ratio was 0.36, and it was mixed at a speed of 60rpm for 1.8h to complete the mixing and obtain a uniform powder.

[0041] Example 4

[0042] Tungsten powder and carbon powder were mixed, the ball-to-material ratio was controlled to be 6:1, the filling rate was 31%, and the ball milling was performed at a speed of 600 mm / s for 12 hours; then the ball-milled powder was mixed with ethanol at a mass ratio of 1:4, washed at a frequency of 30 kHz for 3 hours, and the filtered solid was dried at 100 ° C to constant weight to obtain the first powder. The first powder was loaded into a three-dimensional mixer, the speed was controlled to be 17 r / min, and mixed for 2.3 hours; then the three-dimensional mixed powder and acetone were mixed at a mass ratio of 1:4, washed at a frequency of 38 kHz for 2.5 hours, and the filtered solid was dried at 80 ° C to constant weight to obtain the second powder. Then the second powder was loaded into a double cone mixer, the filling rate was 37%, the baffle was a straight line, the width-to-diameter ratio was 0.34, and it was mixed at a speed of 38 rpm for 2 hours to complete the mixing and obtain a uniform powder.

[0043] Example 5

[0044] Tungsten powder and carbon powder were mixed, the ball-to-material ratio was controlled to be 4.1:1, the filling rate was 46%, and the ball milling was carried out at a speed of 1440 mm / s for 17 hours; then the ball-milled powder was mixed with ethanol at a mass ratio of 1:2.2, washed at a frequency of 36 kHz for 2.4 hours, and the filtered solid was dried at 88°C to constant weight to obtain the first powder. The first powder was loaded into a three-dimensional mixer, the speed was controlled to be 21r / min, and mixed for 1.8 hours; then the three-dimensional mixed powder and ethanol were mixed at a mass ratio of 1:3, washed at a frequency of 40 kHz for 1.6 hours, and the filtered solid was dried at 95°C to constant weight to obtain the second powder. Then the second powder was loaded into a double cone mixer, the filling rate was 42%, the baffle was cross-shaped, the width-to-diameter ratio was 0.33, and mixed at a speed of 57 rpm for 1.8 hours to complete the mixing and obtain a uniform powder.

[0045] The uniform powders prepared in Examples 1 to 5 were subjected to the determination of the carbon content extreme value. The mixed powders were evenly loaded into a 250L stainless steel barrel, and a 300mm long sampling rod with an empty slot was inserted perpendicularly to the powder surface for sampling. Each barrel of powder had four sampling points, and each sampling point was a cross-shaped endpoint equidistant from the center on a cross section 200mm away from the edge of the stainless steel barrel. The powders were analyzed for carbon content using a large-capacity water tank carbon analyzer. The results are recorded in Table 1.

[0046] Table 1 Carbon content extreme value determination results

[0047] Example 1 Example 2 Example 3 Example 4 Example 5 Carbon content extreme value (%) 0.008 0.007 0.007 0.01 0.008

[0048] It can be seen from the above embodiments that the present invention provides a method for improving the uniformity of mixing tungsten powder and element powder, comprising the following steps: mixing tungsten powder and element powder, ball milling and then ultrasonic cleaning to obtain a first powder; three-dimensionally mixing and ultrasonic cleaning the first powder in sequence to obtain a second powder; and double cone mixing the second powder to complete the treatment. According to the results of the embodiment, it can be seen that using the method provided by the present invention, the extreme difference of carbon content is as low as 0.007%, achieving full mixing of the powder and improving the uniformity of the powder.

[0049] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A method for improving the uniformity of mixing tungsten powder and element powder, characterized in that: It includes the following steps: (1) mixing tungsten powder and element powder, ball milling and ultrasonic cleaning to obtain a first powder; (2) performing three-dimensional mixing and ultrasonic cleaning on the first powder in sequence to obtain a second powder; (3) The second powder is subjected to double cone mixing to complete the process.

2. The method for improving the uniformity of mixing tungsten powder and element powder according to claim 1, characterized in that: The ball-to-material ratio of the ball mill in step (1) is 4-6:1, and the filling rate is 30-50%.

3. The method for improving the uniformity of mixing tungsten powder and element powder according to claim 2, characterized in that: The linear speed of the ball mill in step (1) is 500 to 1500 mm / s, and the time is 10 to 20 hours.

4. The method for improving the uniformity of mixing tungsten powder and element powder according to claim 3, characterized in that: The solvent for ultrasonic cleaning in step (1) is ethanol or acetone; the mass ratio of the powder obtained by ball milling to the ultrasonic cleaning solvent is 1:2-4.

5. The method for improving the uniformity of mixing tungsten powder and element powder according to claim 4, characterized in that: The frequency of ultrasonic cleaning in step (1) is 30 to 40 kHz, and the time is 1 to 3 hours.

6. The method for improving the uniformity of mixing tungsten powder and element powder according to claim 5, characterized in that: The rotation speed of the three-dimensional mixing in step (2) is 15 to 25 r / min, and the time is 1 to 2.5 h.

7. The method for improving the uniformity of mixing tungsten powder and element powder according to claim 6, characterized in that: The solvent for ultrasonic cleaning in step (2) is ethanol or acetone; the mass ratio of the powder obtained by three-dimensional mixing to the ultrasonic cleaning solvent is 1:2-4.

8. The method for improving the uniformity of mixing tungsten powder and element powder according to claim 7, characterized in that: The frequency of the ultrasonic cleaning in step (2) is 30 to 40 kHz, and the time is 1 to 3 hours.

9. The method for improving the uniformity of mixing tungsten powder and element powder according to claim 8, characterized in that: The baffle of the double cone mixing in step (3) is in the shape of a straight line or a cross, and the filling rate is 30-50%.

10. The method for improving the uniformity of mixing tungsten powder and element powder according to claim 9, characterized in that: The baffle width-to-diameter ratio of the double-cone mixing in step (3) is 0.3-0.4, the rotation speed is 30-60 rpm, and the time is 1-2 hours.