CN117401682A - Gradient tungsten carbide particles and preparation method thereof - Google Patents
Gradient tungsten carbide particles and preparation method thereof Download PDFInfo
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- CN117401682A CN117401682A CN202311510551.8A CN202311510551A CN117401682A CN 117401682 A CN117401682 A CN 117401682A CN 202311510551 A CN202311510551 A CN 202311510551A CN 117401682 A CN117401682 A CN 117401682A
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- tungsten carbide
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- carbon black
- carbide particles
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- UONOETXJSWQNOL-UHFFFAOYSA-N tungsten carbide Chemical compound [W+]#[C-] UONOETXJSWQNOL-UHFFFAOYSA-N 0.000 title claims abstract description 112
- 239000002245 particle Substances 0.000 title claims abstract description 61
- 238000002360 preparation method Methods 0.000 title abstract description 12
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 20
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 12
- 239000000843 powder Substances 0.000 claims description 44
- 238000000034 method Methods 0.000 claims description 29
- 239000006229 carbon black Substances 0.000 claims description 24
- 238000002156 mixing Methods 0.000 claims description 16
- 239000000203 mixture Substances 0.000 claims description 15
- 238000003763 carbonization Methods 0.000 claims description 12
- 239000002994 raw material Substances 0.000 claims description 12
- 229910000831 Steel Inorganic materials 0.000 claims description 10
- 239000010959 steel Substances 0.000 claims description 10
- 238000010000 carbonizing Methods 0.000 claims description 5
- 238000004519 manufacturing process Methods 0.000 claims 1
- 239000000463 material Substances 0.000 abstract description 7
- 239000011159 matrix material Substances 0.000 abstract description 4
- 229910002804 graphite Inorganic materials 0.000 description 8
- 239000010439 graphite Substances 0.000 description 8
- 229910000990 Ni alloy Inorganic materials 0.000 description 3
- 238000011049 filling Methods 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 238000001514 detection method Methods 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 230000005496 eutectics Effects 0.000 description 1
- 238000007676 flexural strength test Methods 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 238000011031 large-scale manufacturing process Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- 239000010937 tungsten Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B32/00—Carbon; Compounds thereof
- C01B32/90—Carbides
- C01B32/914—Carbides of single elements
- C01B32/949—Tungsten or molybdenum carbides
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2004/00—Particle morphology
- C01P2004/01—Particle morphology depicted by an image
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2004/00—Particle morphology
- C01P2004/60—Particles characterised by their size
- C01P2004/61—Micrometer sized, i.e. from 1-100 micrometer
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Powder Metallurgy (AREA)
Abstract
The invention discloses gradient tungsten carbide particles and a preparation method thereof, and belongs to the technical field of tungsten carbide materials, wherein the tungsten carbide particles comprise saturated tungsten carbide shell layers and unsaturated tungsten carbide cores, the total carbon content of the saturated tungsten carbide shell layers is 4.5-6.2%, and the total carbon content of the unsaturated tungsten carbide cores is 3.8-4.5%. The tungsten carbide particles can effectively improve the strength of the drill bit in the preparation of the matrix drill bit.
Description
Technical Field
The invention belongs to the technical field of tungsten carbide materials, and particularly relates to gradient tungsten carbide particles and a preparation method thereof.
Background
The gradient tungsten carbide is a special tungsten carbide particle material with the same particle and multiple phase components; the material adopts cast tungsten carbide as a raw material, and realizes the improvement of the particle surface property through the control of the carbonization process, thereby obtaining a high-quality composite material. The material has better application performance because the surface and the center of the particles have different phase compositions and tissue structures.
Cast tungsten carbide is an unsaturated tungsten carbide with a molecular structure of W2C.WC and has a dendritic eutectic structure. Cast tungsten carbide is a surface application material with high hardness, high melting point, high wear resistance and other excellent performances. The cast tungsten carbide is mainly used for reinforcing the surface of petroleum drilling and mine tool materials; the matrix drill bit is prepared by mixing nickel alloy powder and other metal powder organically, or the surface wear-resistant coating of the mine tool is prepared by adopting a PTA overlaying process mode, so that the surface wear resistance of a workpiece and the service life of the workpiece are enhanced. However, in the use process, as the cast tungsten carbide and the nickel alloy powder form a fragile layer at the joint, the strength of the drill bit or the workpiece is lower in the use process, the service life of the drill bit or the workpiece is shortened, and other saturated tungsten carbide is not used in the application process.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides gradient tungsten carbide particles and a preparation method thereof, and the tungsten carbide particles can effectively improve the strength of a matrix drill bit or a workpiece in the use process.
In order to achieve the above purpose, the technical scheme adopted by the invention for solving the technical problems is as follows:
a gradient tungsten carbide particle comprises a saturated tungsten carbide shell layer and an unsaturated tungsten carbide core, wherein the total carbon content of the saturated tungsten carbide shell layer is 4.5-6.2%, and the total carbon content of the unsaturated tungsten carbide core is 3.8-4.5%.
Further, the gradient tungsten carbide particles had a particle size of-250+45 μm.
Further, the thickness of the saturated tungsten carbide shell layer is 2-40 μm, and the microhardness HV0.1 is 1400-2000kgf/mm 2 The method comprises the steps of carrying out a first treatment on the surface of the The microhardness HV0.1 of the unsaturated tungsten carbide core is 2000-2500kgf/mm 2 。
Further, the method comprises the following steps: taking cast tungsten carbide powder as a raw material, adding carbon black powder into the cast tungsten carbide powder, mixing until the carbon black powder is uniformly wrapped on the surface of the tungsten carbide powder, then carbonizing the mixture at high temperature, and removing redundant carbon black after carbonization is finished to obtain gradient tungsten carbide particles.
Further, the particle size of the cast tungsten carbide powder is-250+45 μm; the particle size of the carbon black powder is 1-10 μm.
Further, the addition amount of the carbon black powder is 0.5-10% of the weight of the cast tungsten carbide powder.
Further, a roller mixer is adopted for mixing, the diameter of the roller is 200-800mm, and the rotating speed is 5-30r/min.
Further, steel balls with the diameter of 10-50mm are added into the mixture during mixing, and the addition amount of the steel balls is 5-25% of the weight of the mixture.
Further, compacting the mixture prior to high temperature carbonization is required to bring the cast tungsten carbide surface into intimate contact with the carbon black powder.
Further, the high-temperature carbonization temperature is 1000-2000 ℃, and the carbonization time is 5-30min.
The beneficial effects of the invention are as follows:
1. in the using process of the gradient tungsten carbide, as the gradient tungsten carbide particles and the nickel alloy powder no longer form a fragile layer at the joint, the bonding strength of the bonding metal and the hard phase particles is greatly improved, and the overall bonding strength of a matrix drill bit or a workpiece is further improved.
2. The preparation method provided by the invention is simple, short in preparation time, high in preparation efficiency and suitable for large-scale production.
Drawings
FIG. 1 is a metallographic photograph of gradient tungsten carbide prepared in the examples of the present application;
fig. 2 is a schematic diagram of the arrangement of tungsten carbide particles and carbon black powder in the examples of the present application.
Detailed Description
The present invention will be described in further detail with reference to the following examples in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the particular embodiments described herein are illustrative only and are not intended to limit the invention, i.e., the embodiments described are merely some, but not all, of the embodiments of the invention.
Thus, the following detailed description of the embodiments of the invention, as provided, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be made by a person skilled in the art without making any inventive effort, are intended to be within the scope of the present invention.
It is noted that relational terms such as "first" and "second", and the like, are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises an element.
The features and capabilities of the present invention are described in further detail below with reference to the examples and figures.
Example 1
The gradient tungsten carbide particle has a particle size of-150+63 um, i.e. a particle size of greater than 63um and less than 150um, and the subsequent examples are treated correspondingly; the particle comprises a saturated tungsten carbide shell layer and an unsaturated tungsten carbide core, wherein the total carbon content of the saturated tungsten carbide shell layer is 6.13 percent, the thickness of the saturated tungsten carbide shell layer is 11 mu m, and the microhardness HV0.1 is 1723kgf/mm 2 The method comprises the steps of carrying out a first treatment on the surface of the The total carbon content of the unsaturated tungsten carbide core was 3.98%, and the microhardness HV0.1 of the unsaturated tungsten carbide core was 2109kgf/mm 2 。
The preparation method of the gradient tungsten carbide particles comprises the following steps: taking cast tungsten carbide powder with the particle size of-150+63 mu m as a raw material, adding carbon black powder with the particle size of 3.3 mu m, wherein the addition amount of the carbon black powder is 5.0 percent of the weight of the cast tungsten carbide powder, mixing by adopting a drum mixer, wherein the diameter of a drum is 350mm, the rotating speed is 12r/min, adding steel balls with the diameter of 10mm into the cast tungsten carbide powder during mixing, wherein the addition amount of the steel balls is 5 percent of the weight of the mixture, mixing for 2 hours until the carbon black powder is uniformly wrapped on the surface of the manufactured tungsten carbide powder, then filling the mixture into a graphite boat, compacting, then placing the graphite boat into a resistance heating furnace, carbonizing at the high temperature of 1000 ℃ for 15min, and removing redundant carbon black after carbonization is finished to obtain gradient tungsten carbide particles.
Example 2
A gradient tungsten carbide particle with a particle size of-250+100um; the particle comprises a saturated tungsten carbide shell layer and an unsaturated tungsten carbide core, wherein the total carbon content of the saturated tungsten carbide shell layer is 6.17 percent, the thickness of the saturated tungsten carbide shell layer is 27 mu m, and the microhardness HV0.1 is 1639kgf/mm 2 The method comprises the steps of carrying out a first treatment on the surface of the The total carbon content of the unsaturated tungsten carbide core was 4.05%, and the microhardness HV0.1 of the unsaturated tungsten carbide core was 2096kgf/mm 2 。
The preparation method of the gradient tungsten carbide particles comprises the following steps: taking cast tungsten carbide powder with the particle size of-250+100 mu m as a raw material, adding carbon black powder with the particle size of 6 mu m, wherein the addition amount of the carbon black powder is 10.0 percent of the weight of the cast tungsten carbide powder, mixing by adopting a drum mixer, wherein the diameter of a drum is 500mm, the rotating speed is 20r/min, adding steel balls with the diameter of 25mm into the cast tungsten carbide powder during mixing, wherein the addition amount of the steel balls is 20 percent of the weight of the mixture, mixing for 2 hours until the carbon black powder is uniformly wrapped on the surface of the manufactured tungsten carbide powder, then filling the mixture into a graphite boat, compacting, then placing the graphite boat into a resistance heating furnace, carbonizing for 30min at the high temperature of 1500 ℃, and removing redundant carbon black after carbonization is finished to obtain gradient tungsten carbide particles.
Example 3
A gradient tungsten carbide particle with a particle size of-100+45 um; the particle comprises a saturated tungsten carbide shell layer and an unsaturated tungsten carbide core, wherein the total carbon content of the saturated tungsten carbide shell layer is 6.14 percent, the thickness of the saturated tungsten carbide shell layer is 7 mu m, and the microhardness HV0.1 is 1707kgf/mm 2 The method comprises the steps of carrying out a first treatment on the surface of the The total carbon content of the unsaturated tungsten carbide core was 3.96%, and the microhardness HV0.1 of the unsaturated tungsten carbide core was 2197kgf/mm 2 。
The preparation method of the gradient tungsten carbide particles comprises the following steps: taking cast tungsten carbide powder with the particle size of-100+45 um as a raw material, adding carbon black powder with the particle size of 10 mu m into the raw material, wherein the addition amount of the carbon black powder accounts for 1% of the weight of the cast tungsten carbide powder, mixing the raw material by adopting a drum mixer, wherein the diameter of a drum is 500mm, the rotating speed is 30r/min, adding steel balls with the diameter of 50mm into the raw material during mixing, mixing the raw material for 2 hours until the addition amount of the steel balls accounts for 25% of the weight of the mixture, uniformly wrapping the surface of the manufactured tungsten carbide powder, then filling the mixture into a graphite boat, compacting the graphite boat, then placing the graphite boat into a resistance heating furnace, carbonizing the graphite boat at the high temperature of 2000 ℃ for 5min, and removing redundant carbon black after carbonization is finished to obtain gradient tungsten carbide particles.
Wherein, -100+45um means that the particle size is less than 100um and more than 45um.
Test examples
The gradient tungsten carbide particles prepared in examples 1 to 3 were used as examples, which were subjected to metallographic examination, and the properties of the gradient tungsten carbide particles were measured, and the specific results are shown in Table 1.
Table 1:
as can be seen from the data in the table above, the hardness of the tungsten carbide shell layer and the hardness of the tungsten carbide core prepared in the examples of the present application are both relatively high.
Taking the gradient tungsten carbide-180+45 um prepared in the example 1 as a raw material, and adding 10% of-75+20 um nickel powder; preparing a sample block by adopting a copper-based alloy through an infiltration process, and processing the sample block into a test block by means of wire cutting and the like for detection; the flexural strength test value is 799N/mm 2 The test block prepared by adopting the same process with cast tungsten carbide as the raw material has the detection value of 685N/mm 2 The method comprises the steps of carrying out a first treatment on the surface of the The bending strength is increased by 16.6% compared with that of the tungsten carbide, and the gradient tungsten carbide prepared by the method has higher strength.
Claims (10)
1. A gradient tungsten carbide particle, wherein the tungsten carbide particle comprises a saturated tungsten carbide shell and an unsaturated tungsten carbide core, wherein the saturated tungsten carbide shell has a total carbon content of 4.5-6.2% and the unsaturated tungsten carbide core has a total carbon content of 3.8-4.5%.
2. The gradient tungsten carbide particle of claim 1, wherein the gradient tungsten carbide particle size is-250+45 um.
3. The gradient tungsten carbide particles of claim 1, wherein the saturated tungsten carbide shell layer has a thickness of 2 to 40 μm and a microhardness HV0.1 of 1400 to 2000kgf/mm 2 The method comprises the steps of carrying out a first treatment on the surface of the The microhardness HV0.1 of the unsaturated tungsten carbide core is 2000-2500kgf/mm 2 。
4. A method of preparing the gradient tungsten carbide particles of any of claims 1-3, comprising the steps of: taking cast tungsten carbide powder as a raw material, adding carbon black powder into the cast tungsten carbide powder, mixing until the carbon black powder is uniformly wrapped on the surface of the tungsten carbide powder, then carbonizing the mixture at high temperature, and removing redundant carbon black after carbonization is finished to obtain gradient tungsten carbide particles.
5. The method for producing gradient tungsten carbide particles as claimed in claim 4, wherein the particle size of the cast tungsten carbide powder is-250+45 μm; the particle size of the carbon black powder is 1-10 μm.
6. The method of producing gradient tungsten carbide particles according to claim 4, wherein the carbon black powder is added in an amount of 0.5 to 10% by weight based on the weight of the cast tungsten carbide powder.
7. The method for preparing the gradient tungsten carbide particles according to claim 4, wherein the mixing is performed by a drum mixer, the diameter of the drum is 200-800mm, and the rotating speed is 5-30r/min.
8. The method for preparing gradient tungsten carbide particles according to claim 7, wherein steel balls with the diameter of 10-50mm are added into the mixture during mixing, and the addition amount of the steel balls is 5-25% of the weight of the mixture.
9. The method of preparing graded tungsten carbide particles according to claim 4 wherein the mixture is compacted prior to high temperature carbonization to bring the cast tungsten carbide surface into intimate contact with the carbon black powder.
10. The method for preparing the gradient tungsten carbide particles according to claim 4, wherein the high-temperature carbonization temperature is 1000-2000 ℃ and the carbonization time is 5-30min.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311510551.8A CN117401682A (en) | 2023-11-14 | 2023-11-14 | Gradient tungsten carbide particles and preparation method thereof |
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| CN202311510551.8A CN117401682A (en) | 2023-11-14 | 2023-11-14 | Gradient tungsten carbide particles and preparation method thereof |
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| CN117401682A true CN117401682A (en) | 2024-01-16 |
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| CN202311510551.8A Pending CN117401682A (en) | 2023-11-14 | 2023-11-14 | Gradient tungsten carbide particles and preparation method thereof |
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- 2023-11-14 CN CN202311510551.8A patent/CN117401682A/en active Pending
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