CN218882158U - High-wear-resistance polycrystalline diamond compact - Google Patents
High-wear-resistance polycrystalline diamond compact Download PDFInfo
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- CN218882158U CN218882158U CN202023297234.7U CN202023297234U CN218882158U CN 218882158 U CN218882158 U CN 218882158U CN 202023297234 U CN202023297234 U CN 202023297234U CN 218882158 U CN218882158 U CN 218882158U
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Abstract
The utility model provides a high wear-resisting polycrystalline diamond compact, includes polycrystalline diamond layer and the carbide base member that is located polycrystalline diamond layer below, and polycrystalline diamond layer is coarse grain polycrystalline diamond layer, and the inside axial of coarse grain polycrystalline diamond layer sets up the fine grain polycrystalline diamond cylinder that the granularity is less than polycrystalline diamond layer. The granularity of outside polycrystalline diamond layer is coarse grain size, has guaranteed the impact toughness who just gets into well drilling operation initial stage as the impact toughness layer, guarantees that the product does not break the tooth, has reduced the spoilage. The granularity of inside fine grain polycrystalline diamond cylinder is the fine grit, and the granularity is finer than polycrystalline diamond layer, and as the design of wearing layer, guarantee polycrystalline diamond compact from the beginning to use to accomplish the whole in-process of task index, the wearability keeps unanimous, has improved the comprehensive performance of product.
Description
Technical Field
The utility model relates to a polycrystalline diamond compact field, more specifically says, relates to a high wear-resisting polycrystalline diamond compact.
Background
Polycrystalline Diamond Compact (PDC) belongs to a novel functional material, is formed by sintering diamond micro powder and a hard alloy matrix under the condition of High Temperature and High Pressure (HTHP), generally has a cylindrical structure appearance, has the high hardness, high wear resistance and heat conductivity of diamond, has the strength and impact toughness of hard alloy, and is an ideal material for manufacturing cutting tools, drilling bits and other wear-resistant tools.
With the deep development of the geological drilling field in recent years, the drilling depth of the drilled well is deeper and deeper, and the requirement on the comprehensive performance of the material for geological drilling is higher and higher. Along with the deepening of the drilling depth, the service conditions of the polycrystalline diamond compact bit are more and more complex, the requirements on the wear resistance and the impact toughness of the compact are higher and higher, the wear loss of a plurality of polycrystalline diamond compact composite layers reaches 1/3, even more, and therefore the improvement of the wear resistance of the polycrystalline diamond compact composite layers becomes one of the key factors for improving the drilling capability of the bit. In addition, because the speed of the drill bit is high in the drilling operation, the geological formation environment is harsh and complicated, and the polycrystalline diamond composite layer also has enough impact toughness to avoid the situation of cracking, direct damage and failure when the drilling is started. However, from the perspective of the polycrystalline diamond layer, if the grain size of the composite layer is to be ensured to be finer in order to ensure better wear resistance and thermal stability, and if the grain size of the composite layer is to be coarser in order to ensure better impact toughness of the product, a contradiction is generated in the grain size selection of the polycrystalline diamond composite layer when the polycrystalline diamond compact is produced. Meanwhile, in the synthesis process of the polycrystalline diamond compact, the pressure transmission mode from outside to inside also causes an obvious pressure difference between the inside and the outer surface of the compact, so that the internal wear resistance of the polycrystalline diamond compact is obviously lower than that of the outer surface.
SUMMERY OF THE UTILITY MODEL
To the problem that exists among the above-mentioned prior art, the utility model aims at providing a high wear-resisting polycrystalline diamond compact to when solving the comprehensive properties such as the promotion in the above-mentioned background art and guaranteeing polycrystalline diamond layer wearability, thermal stability, impact toughness, the problem that the granularity of polycrystalline diamond composite bed set up.
In order to achieve the above purpose, the utility model provides a following technical scheme: the utility model provides a high wear-resisting polycrystalline diamond compact, includes polycrystalline diamond layer and is located the carbide base member of polycrystalline diamond layer below, polycrystalline diamond layer is coarse grain polycrystalline diamond layer, and the inside axial of coarse grain polycrystalline diamond layer sets up the fine grain polycrystalline diamond cylinder that the granularity is less than polycrystalline diamond layer.
The fine particle polycrystalline diamond cylinder is a cylinder, a transition layer is arranged between the fine particle polycrystalline diamond cylinder and the polycrystalline diamond layer, small particle polycrystalline diamonds are gradually reduced in the transition layer from the fine particle polycrystalline diamond cylinder to the direction of the polycrystalline diamond layer, and large particle polycrystalline diamonds are gradually increased.
The thickness of the transition layer is 0.3-0.8mm.
The fine-grained polycrystalline diamond cylinder is located in the center of the polycrystalline diamond layer.
The diameter of the fine-grained polycrystalline diamond cylinder is 0.5 to 0.8 times of the diameter of the polycrystalline diamond layer.
The fine particle polycrystalline diamond cylinder (8) may be configured as a hollow fine particle polycrystalline diamond cylinder, the hollow fine particle polycrystalline diamond cylinder being coaxial with the polycrystalline diamond layer (2) and diffusing in a radial direction.
The diameter of the hollow fine-particle polycrystalline diamond cylinder (8) is 0.1-0.5 times of the diameter of the polycrystalline diamond layer, and the preferred diameters are 0.4 times and 0.2 times from large to small.
The height of the fine-particle polycrystalline diamond cylinder (4) and the height of the hollow fine-particle polycrystalline diamond cylinder (8) are 0.5-1 times of the height of the polycrystalline diamond layer.
The grain size ratio of the polycrystalline diamond micro powder of the fine-grain polycrystalline diamond cylinder (4) to the polycrystalline diamond micro powder of the hollow fine-grain polycrystalline diamond cylinder (8) is as follows: 10% of 2-4 μm, 20% of 4-8 μm, 60% of 16-26 μm and 10% of 30-40 μm; the grain size ratio of the polycrystalline diamond micro powder of the coarse-grain polycrystalline diamond layer is as follows: 5% of 4-8 μm, 15% of 12-22 μm, 60% of 25-40 μm, 15% of 40-60 μm and 5% of 60-80 μm.
And carrying out deep cobalt removal treatment on the polycrystalline diamond layer, wherein the cobalt removal depth is more than 700 mu m.
Compared with the prior art, the beneficial effects of the utility model are that:
1. the granularity of outside polycrystalline diamond layer is coarse grain size, has guaranteed the impact toughness who just gets into well drilling operation initial stage as the impact toughness layer, guarantees that the product does not break the tooth, has reduced the spoilage. The granularity of the polycrystalline diamond cylinder with fine internal particles is fine, is finer than that of the polycrystalline diamond layer, and is used as a wear-resistant layer, so that the wear resistance of the polycrystalline diamond compact is kept consistent in the whole process from the beginning to the completion of task indexes, and the comprehensive use performance of the product is improved;
2. according to the laboratory detection effect, the impact toughness is kept unchanged, the abrasion loss from the outer surface to the center is reduced to 10% from the original 30%, and the abrasion resistance is improved by 20% compared with the prior product.
3. Carry out the deep cobalt (more than 700 um) of taking off to polycrystalline diamond layer, can improve the thermal stability of product, carry out the chamfer to polycrystalline diamond layer's up end, improve the impact toughness in the compound piece use.
4. The stability of well drilling quality has been guaranteed, has increased the well drilling degree of depth, has reduced the well drilling cost, has reduced the drill bit damage condition, has promoted the operating efficiency.
Drawings
Fig. 1 is a schematic cross-sectional view 1 of a polycrystalline diamond compact.
Fig. 2 is a schematic cross-sectional view 2 of a polycrystalline diamond compact.
Fig. 3 is a schematic cross-sectional view 3 of a polycrystalline diamond compact.
Fig. 4 is a schematic cross-sectional view 4 of a polycrystalline diamond compact.
FIG. 5 is the assembly process of FIG. 1 according to example 4.
FIG. 6 is the assembly process of FIG. 2 according to example 4.
FIG. 7 is the assembly process of FIG. 3 according to example 4.
FIG. 8 is a diagram of the assembly process of embodiment 4.
Fig. 9 is a top view of a polycrystalline diamond compact according to example 4.
Wherein, 1, a hard alloy matrix; 2. a polycrystalline diamond layer; 3. a transition layer; 4. a fine particle polycrystalline diamond cylinder; 5. a hollow cylinder; 6. a metal bottom cup; 7. a metal cap cup; 8. a hollow fine-grained polycrystalline diamond cylinder.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
The utility model provides a high wear-resisting polycrystalline diamond compact, includes polycrystalline diamond layer 2 and is located the carbide base member 1 of polycrystalline diamond layer below, polycrystalline diamond layer 2 is coarse grain polycrystalline diamond layer, and the inside axial of coarse grain polycrystalline diamond layer sets up the fine grain polycrystalline diamond cylinder 4 that the granularity is less than polycrystalline diamond layer.
The fine particle polycrystalline diamond cylinder 4 is a cylinder, the transition layer 3 is arranged between the fine particle polycrystalline diamond cylinder 4 and the polycrystalline diamond layer 2, small particle polycrystalline diamonds are gradually reduced in the transition layer from the fine particle polycrystalline diamond cylinder 4 to the polycrystalline diamond layer 2, and large particle polycrystalline diamonds are gradually increased.
The thickness of the transition layer 3 is 0.3-0.8mm; the transition layer 3 is beneficial to the combination of two polycrystalline diamonds with different granularities in the polycrystalline diamond composite layer to be more compact and firm.
The fine-grained polycrystalline diamond cylinder 4 is located in the center of the polycrystalline diamond layer 2.
The diameter of the fine-grained polycrystalline diamond cylinder 4 is 0.5 to 0.8 times the diameter of the polycrystalline diamond layer.
The fine particle polycrystalline diamond cylinder (8) may be configured as a hollow fine particle polycrystalline diamond cylinder, the hollow fine particle polycrystalline diamond cylinder being coaxial with the polycrystalline diamond layer (2) and diffusing in a radial direction.
The diameter of the hollow fine-particle polycrystalline diamond cylinder (8) is 0.1-0.5 times of the diameter of the polycrystalline diamond layer, and the preferred diameters are 0.4 times and 0.2 times from large to small.
The fine-particle polycrystalline diamond cylinder (4) and the hollow fine-particle polycrystalline diamond cylinder (8) are 0.5-1 times as high as the polycrystalline diamond layer.
The grain size ratio of the polycrystalline diamond micro powder of the fine-grain polycrystalline diamond cylinder (4) and the hollow fine-grain polycrystalline diamond cylinder (8) is as follows: 10% of 2-4 μm, 20% of 4-8 μm, 60% of 16-26 μm and 10% of 30-40 μm; the grain size ratio of the polycrystalline diamond micro powder of the coarse-grain polycrystalline diamond layer is as follows: 5% of 4-8 μm, 15% of 12-22 μm, 60% of 25-40 μm, 15% of 40-60 μm and 5% of 60-80 μm.
And carrying out deep cobalt removal treatment on the polycrystalline diamond layer 2, wherein the cobalt removal depth is more than 700 mu m.
Detailed description of the preferred embodiment 1
As shown in fig. 1, in the assembly structure of a highly wear-resistant polycrystalline diamond compact, during assembly, a polycrystalline diamond composite layer is assembled in a metal bottom cup, a hard alloy substrate is placed, and finally a metal cap cup is placed on the upper end of the hard alloy substrate.
When the polycrystalline diamond composite layer is assembled, a hollow cylinder is placed in the metal bottom cup, the wall thickness of the hollow cylinder is equal to the thickness of the transition layer, generally 0.5mm is selected, and the central axis of the hollow cylinder is overlapped with the central axis of the metal bottom cup. Place coarse grain polycrystalline diamond miropowder in the space that cup inboard and hollow cylinder outside formed at the metal end, place fine grain polycrystalline diamond miropowder on the hollow interior circle of hollow cylinder's bottom surface, and reserve a certain amount of miropowder, coarse grain polycrystalline diamond miropowder and the reserve volume of fine grain polycrystalline diamond miropowder respectively account for half, equal to half of the shared volume of the transition layer after duning the tie respectively, the volume of transition layer equals the area of bottom surface ring times the height of transition layer, then at the uniform velocity upwards lifts up hollow cylinder, the polycrystalline diamond miropowder border department of two kinds of different granularities mixes together, form the transition layer. And (3) twisting flat by using a T-shaped hammer, wherein the thickness of the twisted flat is equal to that of the polycrystalline diamond layer and also equal to that of the polycrystalline diamond column, then putting the polycrystalline diamond column into a hard alloy substrate, and covering a metal cap cup, or covering the metal cap cup after shaping.
Specific example 2
As shown in fig. 2, another assembly structure of a highly wear-resistant polycrystalline diamond compact is shown, in which a polycrystalline diamond composite layer is assembled in a metal bottom cup, a hard alloy substrate is placed, and a metal cap cup is placed on the upper end of the hard alloy substrate.
When the polycrystalline diamond composite layer is assembled, a hollow cylinder is placed in the metal bottom cup, the wall thickness of the hollow cylinder is equal to the thickness of the transition layer, generally 0.5mm is selected, and the central axis of the hollow cylinder is coincident with the central axis of the metal bottom cup. Placing coarse-particle polycrystalline diamond micro powder in a space formed by the inner side of a metal bottom cup and the outer side of a hollow cylinder, placing fine-particle polycrystalline diamond micro powder on the hollow inner circle of the bottom surface of the hollow cylinder, reserving a certain amount of micro powder, wherein the reserved amount of the coarse-particle polycrystalline diamond micro powder and the reserved amount of the fine-particle polycrystalline diamond micro powder respectively account for half of the volume of a flattened transition layer, the volume of the transition layer is equal to the area of a bottom surface ring multiplied by the height of the transition layer, then lifting the hollow cylinder upwards at a constant speed, mixing the boundaries of the two types of polycrystalline diamond micro powder with different particle sizes to form the transition layer, flattening by using a T-shaped hammer, the thickness at the moment is the required thickness of a polycrystalline diamond cylinder, then adding a coarse-particle polycrystalline diamond micro powder layer, flattening by using the T-shaped hammer, the flattened thickness is the thickness of a polycrystalline diamond composite layer, finally putting a hard alloy substrate, covering a metal cap cup, or covering a metal cap cup after shaping.
Specific example 3
As shown in fig. 3, another assembly structure of a highly wear-resistant polycrystalline diamond compact is obtained by assembling a polycrystalline diamond composite layer in a metal bottom cup, placing a hard alloy substrate, and finally placing a metal cap cup on the upper end of the hard alloy substrate.
When assembling the polycrystalline diamond composite layer, firstly placing 3 hollow cylinders in a metal bottom cup, wherein the wall thickness of each hollow cylinder is equal to the thickness of a transition layer, generally selecting 0.5mm, the hollow cylinders are distributed outwards from the center of the metal bottom cup along the radial direction, the outer diameter of the bottom surface of the hollow cylinder at the central part is 0.4 times of the diameter of the inner wall of the metal bottom cup, the outer diameter of the lower surface of the hollow cylinder at the middle part is 0.6 times of the diameter of the inner wall of the metal bottom cup, the outer diameter of the lower surface of the hollow cylinder at the outermost end is 0.8 times of the diameter of the inner wall of the metal bottom cup, placing fine polycrystalline diamond micropowder in the hollow cylinder at the central part, placing coarse polycrystalline diamond micropowder between the two hollow cylinders at the central part and the middle part, placing fine polycrystalline diamond micropowder between the two hollow cylinders at the middle part and the outermost end, and placing coarse polycrystalline diamond micropowder between the hollow cylinder at the outermost end and the inner wall of the metal bottom cup; that is, along the radial direction of the metal bottom cup, the fine grain polycrystalline diamond differential and the coarse grain polycrystalline diamond differential are distributed at annular intervals. A certain amount of micro powder is reserved during assembly, the reserved amount of coarse-particle polycrystalline diamond micro powder and the reserved amount of fine-particle polycrystalline diamond micro powder respectively account for half, the reserved amounts of the coarse-particle polycrystalline diamond micro powder and the fine-particle polycrystalline diamond micro powder are respectively equal to half of the volume of a transition layer after flattening, the volume of the transition layer is equal to the area of a bottom surface ring multiplied by the height of the transition layer, then 3 hollow cylinders are lifted upwards at a constant speed, the boundaries of two kinds of polycrystalline diamond micro powder with different particle sizes are mixed together to form the transition layer, the transition layer is twisted flat by a T-shaped hammer, the twisted flat thickness is equal to the thickness of a polycrystalline diamond composite layer and also equal to the thickness of the polycrystalline diamond cylinder, then a hard alloy substrate is placed, a metal cap cup is covered, or the metal cap cup is covered after shaping.
Specific example 4
As shown in fig. 4, another assembly structure of a highly wear-resistant polycrystalline diamond compact is that, during assembly, a polycrystalline diamond composite layer is assembled in a metal bottom cup, a hard alloy substrate is placed, and finally a metal cap cup is placed at the upper end of the hard alloy substrate.
As shown in fig. 5-8, when assembling the polycrystalline diamond composite layer, firstly placing 3 hollow cylinders in a metal bottom cup, wherein the wall thickness of each hollow cylinder is equal to the thickness of a transition layer, generally selecting 0.5mm, the hollow cylinders are distributed outwards from the center of the metal bottom cup along the radial direction, the outer diameter of the bottom surface of the hollow cylinder at the central part is 0.4 times of the diameter of the inner wall of the metal bottom cup, the outer diameter of the lower surface of the hollow cylinder at the middle part is 0.6 times of the diameter of the inner wall of the metal bottom cup, the outer diameter of the lower surface of the hollow cylinder at the outermost end is 0.8 times of the diameter of the inner wall of the metal bottom cup, placing fine polycrystalline diamond micropowder in the hollow cylinder at the central part, placing coarse polycrystalline diamond micropowder between the two hollow cylinders at the central part and the middle part, placing fine polycrystalline diamond micropowder between the two hollow cylinders at the middle part and the outermost end, and placing coarse polycrystalline diamond micropowder between the hollow cylinder at the outermost end and the inner wall of the metal bottom cup; that is, along the radial direction of the metal bottom cup, the fine grain polycrystalline diamond differential and the coarse grain polycrystalline diamond differential are distributed at annular intervals. A certain amount of micro powder is reserved during assembly, the reserved amount of coarse-particle polycrystalline diamond micro powder and the reserved amount of fine-particle polycrystalline diamond micro powder respectively account for half, and are respectively equal to half of the volume occupied by the flattened transition layer, the volume of the transition layer is equal to the area of the bottom surface ring multiplied by the height of the transition layer, then the hollow cylinder is lifted upwards at a constant speed, the boundaries of the two kinds of polycrystalline diamond micro powder with different particle sizes are mixed together to form the transition layer, the transition layer is flattened by using a T-shaped hammer, the thickness at the moment is the required thickness of the polycrystalline diamond cylinder, then the coarse-particle polycrystalline diamond micro powder layer is added, the hollow cylinder is flattened by using the T-shaped hammer, the flattened thickness is the thickness of the polycrystalline diamond composite layer, finally the hard alloy substrate is placed, the metal cap cup is covered, or the metal cap cup is covered after shaping.
In specific example 3 and specific example 4, the annular fine-particle polycrystalline diamond micro powder and the annular coarse-particle polycrystalline diamond micro powder which are distributed from inside to outside may be set to 4 different particle sizes, which are set from inside to outside: fine particle polycrystalline diamond micro powder layer, coarse particle polycrystalline diamond micro powder layer and coarse particle polycrystalline diamond micro powder layer. Are not listed one by one.
It is to be understood that the described embodiments are only a few embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
Claims (9)
1. A high wear-resistant polycrystalline diamond compact comprises a polycrystalline diamond layer (2) and a hard alloy substrate (1) positioned below the polycrystalline diamond layer, and is characterized in that: the polycrystalline diamond layer (2) is a coarse-particle polycrystalline diamond layer, and a fine-particle polycrystalline diamond cylinder (4) with the particle size smaller than that of the polycrystalline diamond layer is axially arranged in the coarse-particle polycrystalline diamond layer.
2. The highly wear resistant polycrystalline diamond compact of claim 1, wherein: the fine particle polycrystalline diamond cylinder (4) is a cylinder, a transition layer (3) is arranged between the fine particle polycrystalline diamond cylinder (4) and the polycrystalline diamond layer (2), and small particle polycrystalline diamonds are gradually reduced and large particle polycrystalline diamonds are gradually increased in the transition layer from the fine particle polycrystalline diamond cylinder (4) to the polycrystalline diamond layer 2.
3. The highly wear resistant polycrystalline diamond compact of claim 2, wherein: the thickness of the transition layer (3) is 0.3-0.8mm.
4. The highly wear resistant polycrystalline diamond compact of claim 1, wherein: the fine-particle polycrystalline diamond cylinder (4) is positioned in the center of the polycrystalline diamond layer (2).
5. The highly wear resistant polycrystalline diamond compact of claim 4, wherein: the diameter of the fine-particle polycrystalline diamond cylinder (4) is 0.5-0.8 times of the diameter of the polycrystalline diamond layer.
6. The highly wear resistant polycrystalline diamond compact of claim 1, wherein: the fine-particle polycrystalline diamond cylinder (4) can be set to be a hollow fine-particle polycrystalline diamond cylinder (8), and the hollow fine-particle polycrystalline diamond cylinder (8) is coaxial with the polycrystalline diamond layer (2) and diffuses in the radial direction.
7. The highly wear resistant polycrystalline diamond compact of claim 6, wherein: the diameter of the hollow fine-particle polycrystalline diamond cylinder (8) is 0.1-0.5 times of the diameter of the polycrystalline diamond layer, and the preferred diameters are 0.4 times and 0.2 times from large to small.
8. The highly wear resistant polycrystalline diamond compact of any one of claims 1 to 7, wherein: the fine-particle polycrystalline diamond cylinder (4) and the hollow fine-particle polycrystalline diamond cylinder (8) are 0.5-1 times as high as the polycrystalline diamond layer.
9. The highly wear resistant polycrystalline diamond compact of claim 1, wherein: and the polycrystalline diamond layer (2) is subjected to deep cobalt removal treatment, and the cobalt removal depth is more than 700 mu m.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112459724A (en) * | 2020-12-31 | 2021-03-09 | 河南晶锐新材料股份有限公司 | High-wear-resistance polycrystalline diamond compact |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112459724A (en) * | 2020-12-31 | 2021-03-09 | 河南晶锐新材料股份有限公司 | High-wear-resistance polycrystalline diamond compact |
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