Manufacturing method of low-residual-stress polycrystalline diamond compact

A polycrystalline diamond and manufacturing method technology, applied in other manufacturing equipment/tools, turbines, engine components, etc., can solve problems such as interface delamination, and achieve the effects of improving heat resistance, improving service life, and reducing mining costs

Pending Publication Date: 2022-01-28
HENAN JINGRUI SUPERHARD MATERIAL
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of the above-mentioned problems in the prior art, the technical problem to be solved by the present invention is to solve the problem of interface delamination when heated during use due to the huge residual stress generated at the interface joint during the sintering process of the existing PDC composite sheet. A method for manufacturing a low residual stress polycrystalline diamond compact is provided, and the polycrystalline diamond manufactured by the method has the characteristics of high impact resistance and high interface bonding force

Method used

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  • Manufacturing method of low-residual-stress polycrystalline diamond compact
  • Manufacturing method of low-residual-stress polycrystalline diamond compact
  • Manufacturing method of low-residual-stress polycrystalline diamond compact

Examples

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Embodiment approach 1

[0036] Such as figure 1 and figure 2 shows a low residual stress polycrystalline diamond composite sheet, when assembling, first assemble the polycrystalline diamond layer 3 in the metal bottom cup 4, put tungsten carbide and at least one of metal cobalt, metal tungsten, and diamond powder to mix and form The formed micropowder is the transition layer 2, then put into the hard alloy layer 1, and finally place the metal cap cup 5 on the upper end of the hard alloy substrate.

[0037]The specific assembly process is: the first step is to put the mixed diamond powder with a particle size of 0.5~100 μm. The average characteristic particle size used in this invention is 16 μm. Or into a stepped structure or planar structure, the thickness of the micropowder is 3.5mm; the second step is to mix tungsten carbide and at least one of metal cobalt, metal tungsten, and diamond micropowder after high-temperature vacuum reduction treatment. , the characteristic particle size of the micr...

Embodiment approach 2

[0039] Such as image 3 and 4 As shown, this embodiment specifically discloses a method for manufacturing a low residual stress polycrystalline diamond composite with 5 layers of transition layers. When assembling, the polycrystalline diamond layer 3 is first assembled in the metal bottom cup 4, and a layer of tungsten carbide and diamond is put in. Mix the micropowder to form the transition layer 2, then put it into the cemented carbide layer 1, and finally place the metal cap cup 5 on the upper end of the cemented carbide substrate.

[0040] The specific assembly process is that the first step is to put the mixed diamond powder with a particle size of 0.5~100 μm. The average characteristic particle size used in this invention is 16 μm. Or turn it into a stepped structure or a flat structure, and the thickness of the micropowder in the cup is 3.5mm;

[0041] The second step is to mix the tungsten carbide micropowder that has undergone high-temperature vacuum reduction treat...

Embodiment approach 3

[0047] Such as image 3 and 4 As shown, this embodiment specifically discloses a method for manufacturing a low residual stress polycrystalline diamond composite with five transition layers. When assembling, the polycrystalline diamond layer 3 is first assembled in the metal bottom cup 5, and tungsten carbide and diamond are mixed. The micropowder is the transition layer 2, then put into the hard alloy layer 1, and finally place the metal cap cup 6 on the upper end of the hard alloy substrate.

[0048] The specific assembly process is that the first step is to put the mixed diamond powder with a particle size of 0.5~100 μm. The average characteristic particle size used in this invention is 16 μm. Or turn it into a stepped structure or a flat structure, and the thickness of the micropowder in the cup is 3.5mm;

[0049] The second step is to mix the tungsten carbide micropowder that has undergone high-temperature vacuum reduction treatment with at least one of metal cobalt, me...

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Abstract

The invention discloses a manufacturing method of a low-residual-stress polycrystalline diamond compact. The polycrystalline diamond compact is formed by sintering a diamond layer and a transition layer with a hard alloy matrix by using a traditional cubic press under the conditions that the pressure is 5-10 GPa and the temperature is 1200-1800 DEG C. The diamond layer is formed by mixing diamonds with the average particle size of 0.5-100 microns, the transition layer is formed by mixing tungsten carbide micro powder or tungsten carbide micro powder with at least one of metal cobalt, metal tungsten and diamond micro powder, and the micro powder of the transition layer is sequentially laid according to the particle size from small to large or according to the diamond duty ratio from large to small, and at least two layers are laid. The polycrystalline diamond compact with low residual stress and high impact toughness in the field of drilling is prepared, and the comprehensive performance of the PDC compact is improved. The impact toughness is further improved, the residual stress between the diamond layer and the alloy substrate is reduced, and the delamination risk of the PDC composite sheet is reduced so as to cope with geological drilling under more and more complex geological conditions.

Description

technical field [0001] The invention relates to the technical field of preparation of superhard composite materials used in oil and natural gas drilling and exploitation, in particular to a method for manufacturing a low residual stress polycrystalline diamond composite sheet. Background technique [0002] In oil and natural gas drilling and exploitation technology, improving the service life and mechanical speed of the drill bit and reducing the number of drill lifts have always been the goals pursued by all customers. Among them, the performance of polycrystalline diamond compact (PDC composite sheet) plays an important role. Key role. Part of the PDC composite sheet in the current prior art is composed of a polycrystalline diamond layer and a tungsten carbide cemented carbide substrate, and a part is added between the diamond layer and the carbide cemented carbide substrate to reduce the residual stress during sintering. But at present, the transition layer is composed o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F5/00B22F7/04B22F3/14
CPCB22F5/00B22F7/04B22F3/14B22F2005/001B22F2007/042
Inventor 王福龙李拥军赵彬
Owner HENAN JINGRUI SUPERHARD MATERIAL
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