CN216277711U

CN216277711U - Polycrystalline diamond compact substrate

Info

Publication number: CN216277711U
Application number: CN202122586225.8U
Authority: CN
Inventors: 樊朝豪; 赵彬; 王晓; 王福龙
Original assignee: HENAN JINGRUI SUPERHARD MATERIAL CO Ltd
Current assignee: HENAN JINGRUI SUPERHARD MATERIAL CO Ltd
Priority date: 2021-10-26
Filing date: 2021-10-26
Publication date: 2022-04-12
Anticipated expiration: 2031-10-26

Abstract

The application discloses polycrystalline diamond compact base member, polycrystalline diamond compact base member's cell type includes by following two at least diameter convergent transition type steps that distribute gradually to the upper surface, and the top is the stage body. The polycrystalline diamond compact substrate can avoid the problem that cobalt is not sufficiently raised in the process of gradually heightening the composite layer, improve the yield of products, and improve the wear resistance of the composite layer and the impact resistance of the whole compact.

Description

Polycrystalline diamond compact substrate

Technical Field

The utility model relates to the technical field of drilling equipment, in particular to a polycrystalline diamond compact substrate.

Background

The polycrystalline diamond compact is formed by sintering diamond micro powder and a hard alloy substrate piece under the condition of ultrahigh pressure and high temperature, has the high hardness, high wear resistance and heat conductivity of diamond and the impact toughness of hard alloy, and is an ideal material for manufacturing cutting tools, drilling bits and other wear-resistant tools.

The composite sheet is developed and produced in large quantity due to excellent performance, the variety and the specification are many, along with the development of the industry of the polycrystalline diamond composite sheet, the polycrystalline diamond layer is thickened continuously and is developed from less than 1mm to 2-4mm, the service life of the product is prolonged, and through the optimization process or the processes of Co removal, heat-resistant layer addition and the like, the thermal stability can be improved, the interface structure can be optimized, the interface stress can be improved, the sintering effect can be improved, and the performance difference can be reduced. However, since the diamond compact itself is formed by sintering two materials at high temperature and high pressure, and the two materials have great difference in physical properties and mechanical properties, how to reduce the stress generated by the combination of the two materials and improve the wear resistance of the composite layer and the impact resistance of the compact as a whole is a problem to be solved by those skilled in the art.

SUMMERY OF THE UTILITY MODEL

In order to solve the technical problems, the utility model provides a polycrystalline diamond compact substrate which can avoid the problem of insufficient cobalt rise in the high-temperature and high-pressure synthesis process, improve the product yield, and improve the wear resistance of a composite layer and the impact resistance of the whole compact.

The groove type of the polycrystalline diamond compact substrate comprises at least two transition type steps with gradually reduced diameters, which are sequentially distributed from the lower surface to the upper surface, and the top of the polycrystalline diamond compact substrate is a stage body.

Preferably, in the polycrystalline diamond compact substrate, a side surface of the transition type step is an outwardly convex arc surface.

Preferably, in the polycrystalline diamond compact substrate, the number of the transition-type steps is 2 to 4.

Preferably, in the polycrystalline diamond compact substrate, the number of the transition-type steps is 3.

Preferably, in the polycrystalline diamond compact substrate, the table is a planar circular table.

Preferably, in the polycrystalline diamond compact substrate, a transition surface between the stage body and the transition-type step adjacent thereto is an arc-shaped surface.

According to the technical scheme, the groove type of the polycrystalline diamond compact substrate provided by the utility model comprises at least two transition type steps with gradually reduced diameters, which are sequentially distributed from the bottom to the top, and the top of the groove is provided with the stage body, so that the groove type gradually rises from outside to inside, and cobalt flows to a composite layer in a high-temperature and high-pressure synthesis process under the condition that an external wear-resistant layer is not influenced, so that the problem of insufficient cobalt rise in the process of gradually increasing the composite layer can be avoided, the product yield is improved, and the wear resistance of the composite layer and the overall impact resistance of the compact are improved.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.

Fig. 1 is a schematic view of an embodiment of a polycrystalline diamond compact substrate provided in accordance with the present disclosure;

fig. 2 is a front cross-sectional view of an embodiment of a polycrystalline diamond compact substrate.

Detailed Description

The core of the utility model is to provide a polycrystalline diamond compact substrate, which can avoid the problem of insufficient cobalt rise in the high-temperature and high-pressure synthesis process, improve the yield of products, and improve the wear resistance of a composite layer and the impact resistance of the whole compact.

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Fig. 1 is a schematic view of an embodiment of a polycrystalline diamond compact substrate according to the present invention, in which a groove shape of the polycrystalline diamond compact substrate includes at least two transition-type steps 1 with gradually reduced diameters, which are sequentially distributed from the bottom to the top, and a table body 2 is arranged at the top.

It should be noted that, the transition type step with the gradually reduced diameter makes the hard alloy matrix at the central part protrude into the composite layer, so as to improve the overall toughness of the polycrystalline diamond compact, the groove shape is completely consistent in the range of 360 degrees in the horizontal direction, the stress distribution is consistent, the problem of uneven stress distribution is avoided, the problem of the directionality of the compact in the process of welding and using the drill bit is further avoided, the number of the transition type steps shown in fig. 1 is 3, actually not limited to the number, when the number is 3, the stress distribution is more appropriate, the contact area can be increased by utilizing a plurality of the transition type steps, the combination of two materials is stronger, the impact resistance of the polycrystalline diamond compact is improved by more than 10%, the delamination and tooth collapse ratio of the polycrystalline diamond compact in the process of drilling and using can be greatly reduced, and the specific form of the transition type steps is not limited, the side surfaces may be flat or curved as shown in fig. 1. The groove shape can be suitable for a composite sheet with a higher composite layer, and the polycrystalline diamond composite sheet matrix with the groove shape can be used from 2.0mm to 4.0mm of the height of the composite layer.

According to the technical scheme, in the embodiment of the polycrystalline diamond compact substrate provided by the utility model, the groove type comprises at least two transition type steps with gradually reduced diameters, which are sequentially distributed from the bottom to the top, and the top is the stage body, so that the groove type gradually rises from outside to inside, and cobalt flows to the composite layer in the high-temperature and high-pressure synthesis process under the condition of not influencing an external wear-resistant layer, therefore, the problem of insufficient cobalt rise in the process of gradually increasing the composite layer can be avoided, the product yield is improved, and the wear resistance of the composite layer and the overall impact resistance of the compact are improved.

In an embodiment of the polycrystalline diamond compact substrate, referring to fig. 2, fig. 2 is a front cross-sectional view of an embodiment of the polycrystalline diamond compact substrate, and a side surface of the transition step may be an outwardly convex arc surface, so that a contact area of the two materials may be further increased, and a bonding strength of the two materials may be further improved. Of course, this is only one of the preferred solutions, and an inwardly concave arc surface may also be adopted, which also serves the purpose of improving the material bonding strength, and an inwardly concave arc surface and an outwardly convex arc surface may also appear alternately, that is, the lowermost transition type step may have a side surface in the form of an inwardly concave arc surface, and the upper transition type step may have a side surface in the form of an outwardly convex arc surface, and so on, which may be selected according to actual needs, and is not limited herein.

In another embodiment of the polycrystalline diamond compact substrate described above, the number of transition-type steps may be 2 to 4. It should be noted here that the contact area is larger when the number of transition steps is larger, but the production is not favorable, so that the number of transition steps can be set to 2 to 4 by taking both factors into consideration, which can be selected according to actual needs, and is not limited here. Further, the number of the transition type steps is preferably 3, and the stress distribution is optimal through finite element analysis.

In another specific embodiment of the polycrystalline diamond compact substrate, the table body may be a planar circular truncated cone, and further, a transition surface between the table body and the transition step adjacent to the table body may be preferably an arc surface, so as to avoid an acute angle, so that the two materials are combined more tightly, and a specific radian of the arc surface is not limited as long as an effective transition is formed.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the utility model. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. The polycrystalline diamond compact substrate is characterized in that the groove type of the polycrystalline diamond compact substrate comprises at least two transition steps with gradually reduced diameters, which are distributed from the lower surface to the upper surface in sequence, and the top of the polycrystalline diamond compact substrate is a stage body;

the side surface of the transition type step is an outward convex cambered surface;

the number of the transition type steps is 3.

2. The polycrystalline diamond compact substrate of claim 1, wherein the table body is a planar circular table.

3. The polycrystalline diamond compact substrate of claim 2, wherein a transition surface between the table body and the transition step adjacent thereto is an arcuate surface.