A high-toughness biomimetic fiber polycrystalline diamond composite material, a preparation method and application thereof

Abstract

The application provides a high-toughness biomimetic fiber polycrystalline diamond composite material and a preparation method and application thereof, and belongs to the technical field of oil drilling and underground engineering. The application provides a high-toughness biomimetic fiber polycrystalline diamond composite material, which comprises a hard alloy base, a hard alloy / fiber composite layer, a transition layer / fiber composite layer, a transition layer and a polycrystalline diamond layer which are sequentially stacked; the hard alloy / fiber composite layer and the transition layer / fiber composite layer have a biomimetic fiber structure. The biomimetic fiber structure in the high-toughness biomimetic fiber polycrystalline diamond composite material can solve the problems of tooth collapse, tooth shedding and hard alloy tooth drop of the composite material caused by the insufficient toughness and wear resistance of the polycrystalline diamond layer of the PDC bit in hard rock strata, and can improve the drilling footage of the PDC bit and effectively improve the efficiency of unconventional oil and gas exploitation.

Description

Technical Field

[0001] This invention relates to the fields of oil drilling and extraction and underground engineering technology, and in particular to a high-strength and tough biomimetic fiber polycrystalline diamond composite material, its preparation method and application. Background Technology

[0002] For long-run drilling in unconventional oil and gas exploration and development, particularly in extremely hard, highly abrasive, and gravelly formations, the most commonly used drilling method is polycrystalline diamond composite (PDC) bits combined with turbine drill bits and impregnated diamond bits. However, with the continuous development of unconventional oil and gas resources, various types of rocks exhibit diverse properties. Traditional single-particle PDC bits are far from sufficient to solve the problem of rock breaking in diverse formations, often resulting in diamond cutting teeth chipping, breakage, and severe wear. Summary of the Invention

[0003] In view of this, the purpose of this invention is to provide a high-strength and toughness biomimetic fiber polycrystalline diamond composite material, its preparation method, and its application. The high-strength and toughness biomimetic fiber polycrystalline diamond composite material provided by this invention can solve the problems of easy tooth breakage, detachment, and carbide tooth loss in composite materials caused by insufficient toughness and wear resistance of polycrystalline diamond layers in hard rock formations in PDC drill bits, thereby improving the drilling footage of PDC drill bits and effectively increasing the efficiency of unconventional oil and gas extraction.

[0004] To achieve the above-mentioned objectives, the present invention provides the following technical solution:

[0005] This invention provides a high-strength and high-toughness biomimetic fiber polycrystalline diamond composite material, comprising a cemented carbide matrix, a cemented carbide / fiber composite layer, a transition layer / fiber composite layer, a transition layer and a polycrystalline diamond layer stacked sequentially.

[0006] The cemented carbide / fiber composite layer includes cemented carbide and fiber polymer loaded on the surface of the cemented carbide, wherein the cemented carbide substrate is in contact with the cemented carbide;

[0007] The transition layer / fiber composite layer includes a transition layer matrix and a fiber polymer loaded on one side surface of the transition layer matrix, wherein the fiber polymer in the transition layer / fiber composite layer is in contact with the fiber polymer in the cemented carbide / fiber composite layer.

[0008] The hard alloy / fiber composite layer and the transition layer / fiber composite layer have a biomimetic fiber structure.

[0009] Preferably, the biomimetic fiber structure is the macroscopic morphological structure of tree rings or biological scales.

[0010] Preferably, the fiber polymer in the transition layer / fiber composite layer and the fiber polymer in the cemented carbide / fiber composite layer are both carbon fibers.

[0011] Preferably, the transition layer comprises the following components by mass fraction: 3% to 28% cemented carbide powder, 5% to 20% carbon fiber, and the balance being diamond micron powder.

[0012] Preferably, the cemented carbide powder includes one or more of tungsten carbide, titanium carbide, tantalum carbide, and a binder.

[0013] Preferably, the raw materials for the polycrystalline diamond layer include diamond micro powder, nonionic surfactant and powdered binder, wherein the mass ratio of diamond micro powder to powdered binder is (50-80):(20-50), and the mass of the nonionic surfactant is not greater than 3% of the mass of diamond micro powder.

[0014] This invention also provides a method for preparing the high-strength and high-toughness biomimetic fiber polycrystalline diamond composite material described in the above technical solution, comprising the following steps:

[0015] After forming a biomimetic structure on the surface of a cemented carbide substrate, a first coating is applied to obtain a cemented carbide fiber composite material.

[0016] After mixing the raw materials for the transition layer, the first sintering, the formation of a biomimetic structure, and the second coating are carried out sequentially to obtain the transition layer composite material.

[0017] The raw materials for the polycrystalline diamond layer are mixed and then subjected to a second sintering to obtain the polycrystalline diamond layer.

[0018] The cemented carbide fiber composite material, the transition layer composite material, and the polycrystalline diamond layer are sequentially stacked and shaped to obtain a blank;

[0019] The preform is subjected to pressure sintering to obtain the high-strength and tough biomimetic fiber polycrystalline diamond composite material.

[0020] Preferably, the thickness of the first coating and the second coating is independently 5 to 15 μm.

[0021] Preferably, the temperature of the first sintering and the second sintering are independently 1100-2200°C, the time is independently 20-30 min, and the pressure is independently 5-20 GPa.

[0022] The present invention also provides the application of the high-strength and toughness biomimetic fiber polycrystalline diamond composite material described in the above technical solution or the high-strength and toughness biomimetic fiber polycrystalline diamond composite material prepared by the preparation method described in the above technical solution in oil drilling and mining.

[0023] This invention provides a high-strength and high-toughness biomimetic fiber polycrystalline diamond composite material, comprising a cemented carbide matrix, a cemented carbide / fiber composite layer, a transition layer / fiber composite layer, a transition layer, and a polycrystalline diamond layer stacked sequentially; the cemented carbide / fiber composite layer includes cemented carbide and a fiber polymer loaded on the surface of the cemented carbide, with the cemented carbide matrix in contact with the cemented carbide; the transition layer / fiber composite layer includes a transition layer matrix and a fiber polymer loaded on one side surface of the transition layer matrix, with the fiber polymer in the transition layer / fiber composite layer in contact with the fiber polymer in the cemented carbide / fiber composite layer; the cemented carbide / fiber composite layer and the transition layer / fiber composite layer have a biomimetic fiber structure.

[0024] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0025] This invention defines the cemented carbide / fiber composite layer as having a biomimetic fiber structure, using a tree ring structure design for the cemented carbide / fiber composite layer. This effectively enhances the effective interlocking area between the cemented carbide matrix and the transition layer. Simultaneously, the addition of fiber polymers to the surface effectively improves the flexibility and bonding strength of the composite material, enhancing the overall impact toughness and strength of the material and reducing the phenomenon of the diamond layer detaching due to excessive impact load or uneven stress. The cemented carbide / fiber composite layer and the transition layer / fiber composite layer are designed with a bioscale structure, and both the cemented carbide / fiber composite layer and the transition layer / fiber composite layer are loaded with fiber polymers. This effectively guides the directional cutting of the drill bit cutting teeth, regulates the strength and toughness of the transition layer material, reduces fracture and chipping at the cemented carbide portion of the cutting teeth, effectively improves the efficiency of unconventional oil and gas extraction, extends the service life of the cutting teeth, reduces extraction costs, and solves the problems of easy failure, short service life, and high cost of PDC drill bits in hard rock formations. Attached Figure Description

[0026] Figure 1 A schematic diagram of the structure of a cemented carbide matrix + cemented carbide / fiber composite layer;

[0027] Figure 2 A schematic diagram of the structure of the transition layer / fiber composite layer + transition layer + polycrystalline diamond layer;

[0028] Figure 3 A schematic diagram showing the fiber polymer connection in the cemented carbide / fiber composite layer and the transition layer / fiber composite layer;

[0029] Figure 4 A schematic diagram of the structure of the fiber polymer in the cemented carbide matrix + cemented carbide / fiber composite layer;

[0030] Figure 5 This is a schematic diagram of the structure of the transition layer / fiber composite layer + fiber polymer in the transition layer;

[0031] Figure 6 Top view of the transition layer / fiber composite layer;

[0032] Figure 7 This is a schematic diagram of the structure of a transition layer + polycrystalline diamond layer;

[0033] Figure 8 This is a graph showing the content variations of each component in the transition layer;

[0034] Figures 1-7 1 is the cemented carbide matrix, 2 is the cemented carbide / fiber composite layer, 3 is the transition layer / fiber composite layer, 4 is the transition layer, 5 is the polycrystalline diamond layer, and 6 is the fiber polymer. Detailed Implementation

[0035] This invention provides a high-strength and high-toughness biomimetic fiber polycrystalline diamond composite material, comprising a cemented carbide matrix, a cemented carbide / fiber composite layer, a transition layer / fiber composite layer, a transition layer and a polycrystalline diamond layer stacked sequentially.

[0036] The cemented carbide / fiber composite layer includes cemented carbide and fiber polymer loaded on the surface of the cemented carbide, wherein the cemented carbide substrate is in contact with the cemented carbide;

[0037] The transition layer / fiber composite layer includes a transition layer matrix and a fiber polymer loaded on one side surface of the transition layer matrix, wherein the fiber polymer in the transition layer / fiber composite layer is in contact with the fiber polymer in the cemented carbide / fiber composite layer.

[0038] The hard alloy / fiber composite layer and the transition layer / fiber composite layer have a biomimetic fiber structure.

[0039] The high-strength and tough biomimetic fiber polycrystalline diamond composite material provided by the present invention includes a cemented carbide matrix.

[0040] In this invention, the cemented carbide substrate is preferably YG8 or YG15. This invention does not have a special limitation on the thickness of the cemented carbide substrate, and commercially available products known to those skilled in the art can be used.

[0041] The high-strength and high-toughness biomimetic fiber polycrystalline diamond composite material provided by the present invention includes a cemented carbide / fiber composite layer and a transition layer / fiber composite layer.

[0042] In this invention, the biomimetic fiber structure is preferably a macroscopic morphological structure of tree rings or biological scales, with fish scales being the preferred biological scale. The design of the cemented carbide / fiber composite layer and the transition / fiber composite layer using a tree ring structure effectively enhances the effective interlocking area between the cemented carbide matrix and the transition layer. Simultaneously, the addition of fiber polymers to the surface effectively improves the flexibility and bonding strength of the composite material, enhancing the overall impact toughness and strength of the material and reducing the phenomenon of the diamond layer detaching due to excessive impact load or uneven stress. The use of biological scales in the design of the cemented carbide / fiber composite layer and the transition / fiber composite layer allows the fiber polymers on the surface of these layers to effectively guide the directional cutting of the drill bit's cutting teeth, regulate the strength and toughness of the transition layer material, reduce fracture and chipping at the cemented carbide portion of the cutting teeth, effectively improve the efficiency of unconventional oil and gas extraction, extend the service life of the cutting teeth, and reduce extraction costs.

[0043] In this invention, the biomimetic structure of the cemented carbide / fiber composite layer and the transition layer / fiber composite layer is preferably interlocking.

[0044] In this invention, the fiber polymer in the transition layer / fiber composite layer and the fiber polymer in the cemented carbide / fiber composite layer are both carbon fibers, and the carbon fibers are preferably formed by stacking sheet-like graphite microcrystals and / or long-chain fiber bundles along the fiber axial direction.

[0045] The high-strength and tough biomimetic fiber polycrystalline diamond composite material provided by the present invention includes a transition layer.

[0046] In this invention, the thickness of the transition layer is preferably 1.5 to 2.0 mm.

[0047] In this invention, the transition layer preferably comprises the following components by mass fraction: 3% to 28% cemented carbide powder, 5% to 20% carbon fiber, and the balance being diamond micro powder.

[0048] In this invention, the mass fraction of cemented carbide powder in the transition layer is preferably 10% to 25%, and most preferably 15%.

[0049] In this invention, the cemented carbide powder preferably includes one or more of tungsten carbide, titanium carbide, tantalum carbide, and a binder, wherein the binder includes cobalt and / or molybdenum binders.

[0050] In this invention, the particle size of the cemented carbide powder is preferably 2 to 6 μm.

[0051] In this invention, the mass fraction of carbon fibers in the transition layer is preferably 10%.

[0052] In this invention, the length of the carbon fiber is preferably 6-20 nm, and the diameter is preferably 7-15 μm.

[0053] In this invention, the particle size of the diamond micro powder is preferably 0.1 to 1 μm.

[0054] In this invention, from the transition layer to the polycrystalline diamond layer, the cemented carbide content preferably decreases in a gradient, while the diamond powder content preferably increases gradually. Specific content variations are as follows: Figure 8 As shown.

[0055] The high-strength and tough biomimetic fiber polycrystalline diamond composite material provided by the present invention includes a polycrystalline diamond layer.

[0056] In this invention, the thickness of the polycrystalline diamond layer is preferably 1.5 to 2.5 mm.

[0057] In this invention, the raw materials of the polycrystalline diamond layer preferably include diamond micro powder, nonionic surfactant and powdered binder. The mass ratio of diamond micro powder to powdered binder is preferably (50-80):(20-50), more preferably 60:40. The mass of the nonionic surfactant is preferably no more than 3% of the mass of diamond micro powder.

[0058] In this invention, the powdered binder is preferably iron powder, cobalt powder, molybdenum powder, boron powder, or silicon powder.

[0059] In this invention, the particle size of the powdered binder is preferably 0.5 to 3.0 μm.

[0060] In this invention, the particle size of the diamond micro powder is preferably 0.1 to 1 μm.

[0061] In this invention, the nonionic surfactant preferably includes one or more of alkylphenol polyoxyethylene ether, fatty alcohol polyoxyethylene ether, lauryl alcohol polyoxyethylene ether, and primary carbon alcohol polyoxyethylene ether (MOA series). The function of the nonionic surfactant is to improve the surface activity of diamond micro powder, so that it can be fully mixed and reacted with the binder.

[0062] Taking biomimetic fiber structures as tree rings as an example, combined with Figures 1-7 The structure of the high-strength and toughness biomimetic fiber polycrystalline diamond composite material is described below. Figures 1-7 1 is the cemented carbide matrix, 2 is the cemented carbide / fiber composite layer, 3 is the transition layer / fiber composite layer, 4 is the transition layer, 5 is the polycrystalline diamond layer, and 6 is the fiber polymer.

[0063] Figure 1 A schematic diagram of the structure of a cemented carbide matrix + cemented carbide / fiber composite layer; Figure 2 A schematic diagram of the structure of the transition layer / fiber composite layer + transition layer + polycrystalline diamond layer; Figure 3A schematic diagram showing the fiber polymer connection in the cemented carbide / fiber composite layer and the transition layer / fiber composite layer; Figure 4 A schematic diagram of the structure of the fiber polymer in the cemented carbide matrix + cemented carbide / fiber composite layer; Figure 5 This is a schematic diagram of the structure of the transition layer / fiber composite layer + fiber polymer in the transition layer; Figure 6 Top view of the transition layer / fiber composite layer; Figure 7 This is a schematic diagram of the structure of a transition layer + polycrystalline diamond layer.

[0064] This invention also provides a method for preparing the high-strength and high-toughness biomimetic fiber polycrystalline diamond composite material described in the above technical solution, comprising the following steps:

[0065] After forming a biomimetic structure on the surface of a cemented carbide substrate, a first coating is applied to obtain a cemented carbide fiber composite material.

[0066] After mixing the raw materials for the transition layer, the first sintering, the formation of a biomimetic structure, and the second coating are carried out sequentially to obtain the transition layer composite material.

[0067] The raw materials for the polycrystalline diamond layer are mixed and then subjected to a second sintering to obtain the polycrystalline diamond layer.

[0068] The cemented carbide fiber composite material, the transition layer composite material, and the polycrystalline diamond layer are sequentially stacked and shaped to obtain a blank;

[0069] The preform is subjected to pressure sintering to obtain the high-strength and tough biomimetic fiber polycrystalline diamond composite material.

[0070] The present invention involves forming a biomimetic structure on the surface of a cemented carbide substrate and then performing a first coating to obtain a cemented carbide fiber composite material.

[0071] In this invention, the method for forming the biomimetic structure is preferably laser engraving or mold hot pressing sintering of the cemented carbide substrate in a single process. This invention does not impose specific limitations on the parameters of the laser engraving and mold hot pressing sintering; methods well-known to those skilled in the art can be used.

[0072] In this invention, the thickness of the first coating is preferably 5 to 15 μm.

[0073] In this invention, the first coating is preferably carbon fiber coating, and the carbon fiber coating is preferably performed using a vacuum ion plating process.

[0074] In this invention, the cemented carbide fiber composite material forms the cemented carbide matrix and the cemented carbide / fiber composite layer after subsequent forming and pressure sintering.

[0075] The present invention involves mixing the raw materials of the transition layer and then sequentially performing a first sintering, forming a biomimetic structure, and a second coating to obtain a transition layer composite material.

[0076] In this invention, the temperature of the first sintering is preferably 1100-2200℃, more preferably 1400℃, the time is preferably 20-30 min, and the pressure is preferably 5-20 GPa.

[0077] In this invention, the method for forming the biomimetic structure is preferably the same as described above, and will not be repeated here.

[0078] In this invention, the thickness of the second coating is preferably 5 to 15 μm.

[0079] In this invention, the second coating is preferably carbon fiber coating, and the carbon fiber coating is preferably performed using a vacuum ion plating process.

[0080] In this invention, the transition layer composite material is formed into the transition layer / fiber composite layer and the transition layer after subsequent forming and pressure sintering.

[0081] In this invention, the raw materials for the polycrystalline diamond layer are mixed and then subjected to a second sintering to obtain the polycrystalline diamond layer.

[0082] In this invention, the temperature of the second sintering is preferably 1100-2200℃, more preferably 1450℃, the time is preferably 20-30min, more preferably 25min, and the pressure is preferably 5-20GPa, more preferably 6.5GPa.

[0083] In this invention, the diamond micro powder and nonionic surfactant are mixed evenly in a solvent to form a mixture, then the powdered binder is added and mixed evenly, and then the mixture is subjected to drying treatment and the second sintering in sequence.

[0084] After obtaining the cemented carbide fiber composite material, the transition layer composite material, and the polycrystalline diamond layer, the present invention sequentially stacks the cemented carbide fiber composite material, the transition layer composite material, and the polycrystalline diamond layer to form a blank.

[0085] After obtaining the blank, the present invention performs pressure sintering on the blank to obtain the high-strength and tough biomimetic fiber polycrystalline diamond composite material.

[0086] In this invention, the temperature of the pressure sintering is preferably 1000-2200℃, more preferably 1050℃, the time is preferably 10-30min, more preferably 15min, and the pressure is preferably 2GPa.

[0087] The present invention also provides the application of the high-strength and toughness biomimetic fiber polycrystalline diamond composite material described in the above technical solution or the high-strength and toughness biomimetic fiber polycrystalline diamond composite material prepared by the preparation method described in the above technical solution in oil drilling and mining.

[0088] The present invention does not impose any special limitation on the specific method of application, and any method known to those skilled in the art can be used.

[0089] The technical solutions of this invention will be clearly and completely described below with reference to the embodiments thereof. Obviously, the described embodiments are only a part of the embodiments of this invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0090] Example 1

[0091] The high-strength and tough biomimetic fiber polycrystalline diamond composite material provided in this embodiment includes the following raw materials by mass percentage: 10wt% cemented carbide powder (tungsten carbide) with a particle size of 2-6μm, 5wt% carbon fiber with a length distribution of 6-20nm and a diameter of 7-15μm, and the balance being diamond micro powder with a particle size of 0.1-1μm.

[0092] The cemented carbide matrix is ​​YG15.

[0093] The preparation method of high-strength and high-toughness biomimetic fiber polycrystalline diamond composite material includes the following steps:

[0094] Preparation of polycrystalline diamond layer: Diamond micro powder with a particle size of 0.1-1 μm and nonionic surfactant alkylphenol polyoxyethylene ether (3% of the mass of diamond micro powder) are mixed evenly in a solvent to prepare a mixture. Then, cobalt powder binder is added and mixed evenly, and then dried. The mass ratio of diamond micro powder to powder binder is 80:20. The sintering temperature is controlled at 1450℃ and held for 25 min. The sintering pressure is 6.5 GPa to prepare polycrystalline diamond layer.

[0095] Transition layer preparation: The transition layer raw material was held at a sintering temperature of 1400℃ for 20 min and the sintering pressure was 5 GPa. The thickness of the transition layer was 1.5 mm.

[0096] After laser engraving tree rings onto YG15 and the transition layer, vacuum ion plating is performed, controlling the vacuum level at 10. -3 Pa, the protective atmosphere is argon, the coating thickness is 10μm, the coating material is carbon fiber, and the tree rings formed by etching are interlocked.

[0097] Composite material synthesis and preparation: Hard alloy composite material, transition layer composite material and polycrystalline diamond layer were pressure sintered. The sintering temperature was controlled at 1050℃ and held for 15 min. The sintering pressure was 2 GPa to obtain high strength and toughness biomimetic fiber polycrystalline diamond composite material.

[0098] Example 2

[0099] The high-strength and tough biomimetic fiber polycrystalline diamond composite material provided in this embodiment includes the following raw materials by mass percentage: 15wt% cemented carbide powder (tungsten carbide) with a particle size of 2-6μm, 10wt% carbon fiber with a length distribution of 6-20nm and a diameter of 7-15μm, and the remainder is diamond micro powder with a particle size of 0.1-1μm.

[0100] The cemented carbide matrix is ​​YG15.

[0101] The preparation method of high-strength and high-toughness biomimetic fiber polycrystalline diamond composite material includes the following steps:

[0102] Preparation of polycrystalline diamond layer: Diamond micro powder with a particle size of 0.1-1 μm and nonionic surfactant alkylphenol polyoxyethylene ether (3% of the mass of diamond micro powder) are mixed evenly in a solvent to prepare a mixture. Then, cobalt powder binder is added and mixed evenly, and then dried. The mass ratio of diamond micro powder to powder binder is 80:20. The sintering temperature is controlled at 1450℃ and held for 25 min. The sintering pressure is 6.5 GPa to prepare polycrystalline diamond layer.

[0103] Transition layer preparation: The transition layer raw material was held at a sintering temperature of 1400℃ for 20 min and the sintering pressure was 5 GPa. The thickness of the transition layer was 1.5 mm.

[0104] After laser engraving tree rings onto YG15 and the transition layer, vacuum ion plating is performed, controlling the vacuum level at 10. -3 Pa, the protective atmosphere is argon, the coating thickness is 10μm, the coating material is carbon fiber, and the tree rings formed by etching are interlocked.

[0105] Composite material synthesis and preparation: Hard alloy composite material, transition layer composite material and polycrystalline diamond layer were pressure sintered. The sintering temperature was controlled at 1050℃ and held for 15 min. The sintering pressure was 2 GPa to obtain high strength and toughness biomimetic fiber polycrystalline diamond composite material.

[0106] Example 3

[0107] The high-strength and tough biomimetic fiber polycrystalline diamond composite material provided in this embodiment includes the following raw materials by mass percentage: 25wt% cemented carbide powder (tungsten carbide) with a particle size of 2-6μm, 20wt% carbon fiber with a length distribution of 6-20nm and a diameter of 7-15μm, and the balance being diamond micro powder with a particle size of 0.1-1μm.

[0108] The cemented carbide matrix is ​​YG15.

[0109] The preparation method of high-strength and high-toughness biomimetic fiber polycrystalline diamond composite material includes the following steps:

[0110] Preparation of polycrystalline diamond layer: Diamond micro powder with a particle size of 0.1-1 μm and nonionic surfactant alkylphenol polyoxyethylene ether (3% of the mass of diamond micro powder) are mixed evenly in a solvent to prepare a mixture. Then, cobalt powder binder is added and mixed evenly, and then dried. The mass ratio of diamond micro powder to powder binder is 80:20. The sintering temperature is controlled at 1450℃ and held for 25 min. The sintering pressure is 6.5 GPa to prepare polycrystalline diamond layer.

[0111] Transition layer preparation: The transition layer raw material was held at a sintering temperature of 1400℃ for 20 min and the sintering pressure was 5 GPa. The thickness of the transition layer was 1.5 mm.

[0112] After laser engraving tree rings onto YG15 and the transition layer, vacuum ion plating is performed, controlling the vacuum level at 10. -3 Pa, the protective atmosphere is argon, the coating thickness is 10μm, the coating material is carbon fiber, and the tree rings formed by etching are interlocked.

[0113] Composite material synthesis and preparation: Hard alloy composite material, transition layer composite material and polycrystalline diamond layer were pressure sintered. The sintering temperature was controlled at 1050℃ and held for 15 min. The sintering pressure was 2 GPa to obtain high strength and toughness biomimetic fiber polycrystalline diamond composite material.

[0114] Example 4

[0115] The high-strength and tough biomimetic fiber polycrystalline diamond composite material provided in this embodiment includes the following raw materials by mass percentage: 15wt% cemented carbide powder (tungsten carbide) with a particle size of 2-6μm, 10wt% carbon fiber with a length distribution of 6-20nm and a diameter of 7-15μm, and the remainder is diamond micro powder with a particle size of 0.1-1μm.

[0116] The cemented carbide matrix is ​​YG15.

[0117] The preparation method of high-strength and high-toughness biomimetic fiber polycrystalline diamond composite material includes the following steps:

[0118] Preparation of polycrystalline diamond layer: Diamond micro powder with a particle size of 0.1-1 μm and nonionic surfactant alkylphenol polyoxyethylene ether (3% of the mass of diamond micro powder) are mixed evenly in a solvent to form a mixture. Then, cobalt powder binder is added and mixed evenly, and then dried. The mass ratio of diamond micro powder to powder binder is 60:40. The sintering temperature is controlled at 1450℃ and held for 25 min. The sintering pressure is 6.5 GPa to prepare polycrystalline diamond layer.

[0119] Transition layer preparation: The transition layer raw material was held at a sintering temperature of 1400℃ for 20 min and the sintering pressure was 5 GPa. The thickness of the transition layer was 1.5 mm.

[0120] After laser engraving tree rings onto YG15 and the transition layer, vacuum ion plating is performed, controlling the vacuum level at 10. -3 Pa, the protective atmosphere is argon, the coating thickness is 10μm, the coating material is carbon fiber, and the tree rings formed by etching are interlocked.

[0121] Composite material synthesis and preparation: Hard alloy composite material, transition layer composite material and polycrystalline diamond layer were pressure sintered. The sintering temperature was controlled at 1050℃ and held for 15 min. The sintering pressure was 2 GPa to obtain high strength and toughness biomimetic fiber polycrystalline diamond composite material.

[0122] The high-strength and toughness biomimetic fiber polycrystalline diamond composite material prepared in the examples was subjected to performance tests, and the results are shown in Table 1. The test standard for mass wear was JB / T 3235-2013, the test standard for impact toughness was GB / T 19585-2004, and the test standard for cutting tooth service life was: the cutting teeth were used under actual working conditions, and the drill bit test showed no visible chipping, breakage, or severe wear. The presence of these phenomena indicated cutting tooth failure. As shown in Table 1, the polycrystalline diamond cutting teeth under the conditions of Example 2 possess both high shear strength and impact toughness. The material exhibits good wear resistance in actual working conditions, and its final service life is longer than that of cutting teeth prepared under other conditions.

[0123] Table 1. Performance test results of the high-strength and tough biomimetic fiber polycrystalline diamond composite material in the examples.

[0124]

[0125] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A high-strength and high-toughness biomimetic fiber polycrystalline diamond composite material, characterized in that, Specifically, it consists of a cemented carbide substrate, a cemented carbide / fiber composite layer, a transition layer / fiber composite layer, a transition layer, and a polycrystalline diamond layer stacked sequentially. The cemented carbide / fiber composite layer includes cemented carbide and carbon fibers loaded on the surface of the cemented carbide, with the cemented carbide matrix in contact with the cemented carbide. The transition layer / fiber composite layer includes a transition layer matrix and carbon fibers loaded on one side surface of the transition layer matrix, wherein the carbon fibers in the transition layer / fiber composite layer are in contact with the carbon fibers in the cemented carbide / fiber composite layer. The hard alloy / fiber composite layer and the transition layer / fiber composite layer have a biomimetic fiber structure; The transition layer comprises the following components by mass fraction: 15% cemented carbide powder, 10% carbon fiber, and the balance being diamond micro powder. The raw materials for the polycrystalline diamond layer include diamond micro powder, nonionic surfactant, and powdered binder. The mass ratio of diamond micro powder to powdered binder is 80:20, and the mass of the nonionic surfactant is 3% of the mass of the diamond micro powder. The biomimetic fiber structure is based on tree rings.

2. The high-strength and high-toughness biomimetic fiber polycrystalline diamond composite material according to claim 1, characterized in that, The cemented carbide powder includes one or more of tungsten carbide, titanium carbide, and tantalum carbide, as well as a binder.

3. The method for preparing the high-strength and toughness biomimetic fiber polycrystalline diamond composite material according to claim 1 or 2, characterized in that, Includes the following steps: After forming a biomimetic structure on the surface of a cemented carbide substrate, a first coating is applied to obtain a cemented carbide fiber composite material. After mixing the raw materials for the transition layer, the first sintering, the formation of a biomimetic structure, and the second coating are carried out sequentially to obtain the transition layer composite material. The raw materials for the polycrystalline diamond layer are mixed and then subjected to a second sintering to obtain the polycrystalline diamond layer. The cemented carbide fiber composite material, the transition layer composite material, and the polycrystalline diamond layer are sequentially stacked and shaped to obtain a blank; The preform is subjected to pressure sintering to obtain the high-strength and tough biomimetic fiber polycrystalline diamond composite material.

4. The preparation method according to claim 3, characterized in that, The thickness of the first coating and the second coating is independently 5~15μm.

5. The preparation method according to claim 3, characterized in that, The temperature of the first sintering and the second sintering are independently 1100~2200℃, the time is independently 20~30min, and the pressure is independently 5~20GPa.

6. The application of the high-strength and high-toughness biomimetic fiber polycrystalline diamond composite material according to claim 1 or 2, or the high-strength and high-toughness biomimetic fiber polycrystalline diamond composite material prepared by the preparation method according to any one of claims 3 to 5, in oil drilling and mining.

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