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CN-224210723-U - Polycrystalline diamond compact with stable structure

CN224210723UCN 224210723 UCN224210723 UCN 224210723UCN-224210723-U

Abstract

The utility model relates to the field of polycrystalline diamond compact production and manufacturing, in particular to a polycrystalline diamond compact with a stable structure, which is cylindrical, and is characterized in that the cylindrical is sequentially composed of a cobalt-removed polycrystalline diamond layer, a transition polycrystalline diamond layer and a hard alloy matrix layer from top to bottom, the transition polycrystalline diamond layer is laminated and combined between the cobalt-removed polycrystalline diamond layer and the hard alloy matrix layer, the upper surface of the hard alloy matrix layer is provided with a bulge, and the lower surface of the transition diamond layer is provided with an indent matched with the bulge on the upper surface of the hard alloy matrix layer; the upper surface of the transition polycrystalline diamond layer is provided with a bulge, and the lower surface of the cobalt-free polycrystalline diamond layer is provided with a concave matched with the bulge on the upper surface of the transition polycrystalline diamond layer, so that the aim of reducing the interface stress of the polycrystalline diamond layer and the hard alloy layer is fulfilled.

Inventors

  • LIN NING

Assignees

  • 河南晶锐新材料股份有限公司

Dates

Publication Date
20260508
Application Date
20250603

Claims (7)

  1. 1. The polycrystalline diamond compact with the stable structure is cylindrical, and is characterized in that the cylindrical polycrystalline diamond compact is composed of a cobalt-removed polycrystalline diamond layer (1), a transition polycrystalline diamond layer (2) and a hard alloy matrix layer (3) which are compounded in sequence from top to bottom, the transition polycrystalline diamond layer (2) is combined between the cobalt-removed polycrystalline diamond layer (1) and the hard alloy matrix layer (3) in a stacked mode, protrusions are arranged on the upper surface of the hard alloy matrix layer (3), concave portions matched with the protrusions on the upper surface of the hard alloy matrix layer (3) are arranged on the lower surface of the transition polycrystalline diamond layer (2), protrusions are arranged on the upper surface of the transition polycrystalline diamond layer (2), and concave portions matched with the protrusions on the upper surface of the transition polycrystalline diamond layer (2) are arranged on the lower surface of the cobalt-removed polycrystalline diamond layer (1).
  2. 2. The polycrystalline diamond compact with the stable structure according to claim 1, wherein the protruding portion of the upper surface of the cemented carbide substrate layer (3) is a first flat-top boss (301), the periphery of the first flat-top boss (301) is transited from an arc to a first circular ring (302), the lower surface of the transitional polycrystalline diamond layer (2) is matched with the upper surface of the cemented carbide substrate layer (3), the protruding portion of the upper surface of the transitional polycrystalline diamond layer (2) is a second flat-top boss (201), the periphery of the second flat-top boss (201) is transited from an arc to a second circular ring (202), and the lower surface of the decobalted polycrystalline diamond layer (1) is matched with the upper surface of the transitional polycrystalline diamond layer (2).
  3. 3. The polycrystalline diamond compact of claim 2 wherein the arcuate transition at the periphery of the first flat top boss (301) or the second flat top boss (201) is a concave arcuate transition.
  4. 4. The polycrystalline diamond compact of claim 2, wherein the rounded transition upper edge of the perimeter of the first flat top boss (301) or the second flat top boss (201) is a convex-rounded connection lower edge concave-rounded transition.
  5. 5. A polycrystalline diamond compact of stable construction according to claim 3, wherein the planar diameter of the first flat top boss (301) or the second flat top boss (201) is 85-95% of the diameter of the polycrystalline diamond compact, and the difference in height between the first flat top boss (301) and the first annular ring (302) and the difference in height between the second flat top boss (201) and the second annular ring (202) are each 0.5-1.5mm.
  6. 6. The polycrystalline diamond compact of claim 5, wherein the transitional polycrystalline diamond layer (2) comprises a wear-resistant polycrystalline diamond layer (21) and an impact-resistant polycrystalline diamond layer (22), the wear-resistant polycrystalline diamond layer (21) is adjacent to the cobalt-free polycrystalline diamond layer (1), the impact-resistant polycrystalline diamond layer (22) is adjacent to the hard alloy substrate layer (3), the upper surface of the impact-resistant polycrystalline diamond layer (22) is provided with a bulge, and the lower surface of the wear-resistant polycrystalline diamond layer (21) is provided with a concave matched with the bulge of the upper surface of the impact-resistant polycrystalline diamond layer (22).
  7. 7. The polycrystalline diamond compact of claim 6, wherein the cobalt-free polycrystalline diamond layer (1) comprises diamond powder with a grain size of 12-20 um, the wear-resistant polycrystalline diamond layer (21) comprises diamond powder with a grain size of 20-30 um, and the impact-resistant polycrystalline diamond layer (22) comprises diamond powder with a grain size of 30-50 um.

Description

Polycrystalline diamond compact with stable structure Technical Field The utility model relates to the field of polycrystalline diamond compact production and manufacturing, in particular to a polycrystalline diamond compact with a stable structure. Background The Polycrystalline Diamond Compact (PDC) is formed by sintering diamond micro powder and a hard alloy (WC-Co) matrix under high temperature and high pressure, belongs to a composite material, has high hardness, high wear resistance and high thermal conductivity of diamond, has impact toughness of the hard alloy, and is an ideal material for manufacturing cutting tools, drilling bits and other wear-resistant tools. Along with the development of the market, the drilling area is enlarged, the drilling stratum is more and more complex, the drilling condition is more and more severe, the requirement of customers on the impact toughness and stability of the product is also more and more high, and the improvement of the impact toughness and stability of the product is always the goal of industry staff. The main components of the medium-high end Polycrystalline Diamond Compact (PDC) are diamond micro powder (the thermal expansion coefficient is about 0.8x10 < -6 >/K), tungsten carbide (the thermal expansion coefficient is about 4.5x10 < -6 >/K) and cobalt (the thermal expansion coefficient is about 13.3x10 < -6 >/K), and the PDC consists of a cobalt-free diamond layer (a pure diamond layer), a diamond layer (diamond and cobalt) and a hard alloy matrix (WC-Co), because the thermal expansion coefficient difference of the cobalt-free diamond layer, the diamond layer and the hard alloy matrix causes the gradual release of stress of the polycrystalline diamond compact in the force and heat environment in the actual drilling process, the stress concentration place can generate failure phenomena of surface collapse, delamination and the like, and the stress concentration place is mainly at the joint of the cobalt-free diamond layer and the joint of the diamond layer and the hard alloy, while the existence of the tungsten carbide and cobalt in the diamond layer can reduce the wear resistance and the thermal stability of the product, the cobalt is indispensable as a catalyst and a binder for diamond growth, and the impact toughness of the product is improved, so how reasonably utilizing the components becomes very critical in terms of improving the quality of the product. In order to ensure the impact toughness and stability of the polycrystalline diamond compact and improve the wear resistance of the polycrystalline diamond compact, a polycrystalline diamond compact with a stable structure is specially designed. Disclosure of utility model In view of the above-mentioned shortcomings of the prior art, the present utility model aims to provide a polycrystalline diamond compact with a stable structure, which not only ensures the impact toughness and stability of the polycrystalline diamond compact, but also improves the wear resistance of the polycrystalline diamond compact. The technical scheme of the utility model is as follows: The polycrystalline diamond compact with the stable structure is in a cylindrical shape, the cobalt-removed polycrystalline diamond layer 1, the transition polycrystalline diamond layer 2 and the hard alloy matrix layer 3 are sequentially compounded from top to bottom, the transition polycrystalline diamond layer 2 is combined between the cobalt-removed polycrystalline diamond layer 1 and the hard alloy matrix layer 3 in a stacked mode, the upper surface of the hard alloy matrix layer 3 is provided with protrusions, the lower surface of the transition diamond layer 2 is provided with concave matched with the protrusions of the upper surface of the hard alloy matrix layer 3, the upper surface of the transition polycrystalline diamond layer 2 is provided with protrusions, and the lower surface of the cobalt-removed polycrystalline diamond layer 1 is provided with concave matched with the protrusions of the upper surface of the transition polycrystalline diamond layer 2. The protruding portion of the upper surface of the hard alloy substrate layer 3 is a first flat-top boss 301, the periphery of the first flat-top boss 301 is transited from an arc to a first circular ring 302, the lower surface of the transitional polycrystalline diamond layer 2 is matched with the upper surface of the hard alloy substrate layer 3, the protruding portion of the upper surface of the transitional polycrystalline diamond layer 2 is a second flat-top boss 201, the periphery of the second flat-top boss 201 is transited from an arc to a second circular ring 202, and the lower surface of the cobalt-removed polycrystalline diamond layer 1 is matched with the upper surface of the transitional polycrystalline diamond layer 2. The circular arc transition of the periphery of the first flat top boss 301 or the second flat top boss 201 is a concave circular arc transition. Th