CN202467670U

CN202467670U - Substrate of polycrystalline diamond compact

Info

Publication number: CN202467670U
Application number: CN2012201241834U
Authority: CN
Inventors: 贺端威
Original assignee: CHENGDU B-TO-O SUPERHARD MATERIALS Co Ltd
Current assignee: CHENGDU B-TO-O SUPERHARD MATERIALS Co Ltd
Priority date: 2012-03-29
Filing date: 2012-03-29
Publication date: 2012-10-03
Anticipated expiration: 2022-03-29

Abstract

The utility model discloses a substrate of a polycrystalline diamond compact. The substrate comprises a hard alloy layer, wherein the hard alloy layer forms a cylinder shape; the upper end face of the hard alloy layer protrudes upwards to form a circular truncated cone; a plurality of layers of stair landings surrounding the side wall of the circular truncated cone are formed on the circular truncated cone; and the upper end face of the hard alloy layer between the circular truncated cone and the edge of the upper end face of the hard alloy layer forms a circular platform. By adopting the structure, the substrate for the polycrystalline diamond compact has a simple integral structure and is easy to realize. In addition, when the substrate is combined with a polycrystalline diamond layer to form the polycrystalline diamond compact, due to the actions of the circular truncated cone and the stair landings formed on the circular truncated cone, the stress at the interface combination position of the substrate and the hard alloy layer is reduced, and the binding strength is high.

Description

The substrate of composite polycrystal-diamond

Technical field

The utility model relates to the super-hard compound material field, specifically is the substrate of composite polycrystal-diamond.

Background technology

Along with the manufacturing science technology rapid development, various new materials, functional material and composite material continue to bring out, and its application constantly enlarges, and the economic and social benefit that is produced also significantly increases.Composite polycrystal-diamond is by polycrystalline diamond layer and the hard alloy layer super-hard compound material that sintering forms under HTHP; As a kind of important tool materials; Composite polycrystal-diamond not only has high hardness and abrasion resistance; And have high impact resistance and heat stability, therefore, composite polycrystal-diamond becomes the critical material of oil, natural gas and geological drilling.

When composite polycrystal-diamond is applied on the drill bit; It is the main working parts on the drill bit; Therefore; The quality of its performance has directly determined the oil-gas geology drilling efficiency, just becomes the direction that people mainly research and develop so how to improve the combination property of composite polycrystal-diamond, and design rational interface shape the combination property that improves composite polycrystal-diamond is had very large effect.As everyone knows, diamond and carbide alloy are two kinds of distinct materials, and both physics, chemical property all differ greatly; The former coefficient of thermal expansion is very little; Latter's coefficient of thermal expansion is very big, when HTHP synthesizes composite polycrystal-diamond, because be rapidly heated and temperature-fall period; So having bigger stress in the junction, interface of two kinds of materials exists; This stress is harmful stress, and its combination property infringement to composite polycrystal-diamond is very big, so the residual stress that how to reduce at the interface becomes present people's question of common concern.

The utility model content

The purpose of the utility model is to overcome the deficiency of prior art, provides when the polycrystalline diamond composite sheet to reduce stress at the interface, thus the substrate of the composite polycrystal-diamond of bond strength between enhancing and the polycrystalline diamond layer.

The purpose of the utility model mainly realizes through following technical scheme: the substrate of composite polycrystal-diamond; Comprise hard alloy layer; Said hard alloy layer constitutes cylindric; Said hard alloy layer upper surface epirelief constitutes the frustum of a cone, constitutes the halfpace of multilayer around its sidewall on the said frustum of a cone, the hard alloy layer upper surface looping platform between the said frustum of a cone and the edge, hard alloy layer upper surface.

The top indent of the said frustum of a cone constitutes groove, and the frustum of a cone constitutes convexity in groove, constitutes groove between the inside wall of said convexity and groove, and the horizontal level of protruding upper surface is identical with the horizontal level of frustum of a cone upper surface.

For the demand that satisfies general composite polycrystal-diamond and reduce processing cost, as the preferred a kind of embodiment of the utility model, the halfpace that the said frustum of a cone constitutes is two-layer.

Compared with prior art; The utlity model has following beneficial effect: the hard alloy layer upper surface epirelief of (1) the utility model constitutes the frustum of a cone; Constitute the multilayer halfpace on the frustum of a cone; And the hard alloy layer upper surface looping platform between the frustum of a cone and the edge, hard alloy layer upper surface, when the utility model and polycrystalline diamond layer carried out sintering, the frustum of a cone had increased the bonded area of the utility model and polycrystalline diamond layer; Reduced the stress of interface junction; The halfpace on the frustum of a cone and the frustum of a cone have constituted the even surface that contacts with polycrystalline diamond layer with ring-shaped platform between the hard alloy layer upper surface, and ring-shaped platform and halfpace have been realized the ladder fixed limit, and this has just strengthened the bond strength between the utility model and the polycrystalline diamond layer; Because of the effect of the frustum of a cone is arranged, this has just reduced the amount of the diamond dust of polycrystalline diamond layer to the utility model, more saves cost when constituting composite polycrystal-diamond.

(2) the top indent of the utility model frustum of a cone constitutes groove; The frustum of a cone constitutes convexity in groove; And constitute groove between the inside wall of protruding and groove, the utility model is set up groove through the top at the frustum of a cone, and this is when the utility model and polycrystalline diamond layer carry out sintering; The diamond dust of polycrystalline diamond layer embeds in the groove; This is further the enhancing the utility model and the joint construction of polycrystalline diamond interlayer just, and like this, the composite polycrystal-diamond structure of formation is more stable.

Description of drawings

Fig. 1 is the structural representation of the utility model embodiment;

Fig. 2 is the structural representation of the composite polycrystal-diamond of employing the utility model embodiment formation.

The pairing name of Reference numeral is called in the accompanying drawing: 1, hard alloy layer, 2, polycrystalline diamond layer, 3, the frustum of a cone, 4, convexity.

The specific embodiment

Below in conjunction with embodiment and accompanying drawing the utility model is done further to specify, but the embodiment of the utility model is not limited thereto.

Embodiment:

As shown in Figure 1, the substrate of composite polycrystal-diamond comprises hard alloy layer 1, and wherein, hard alloy layer 1 is to be main component with high rigidity refractory metal tungsten carbide (WC) micron powder, and is that the cementing agent sintering forms with cobalt (Co), and its formation is cylindric.Hard alloy layer 1 upper surface epirelief constitutes the frustum of a cone 3; The frustum of a cone 3 is positioned at the central part of hard alloy layer 1 upper surface; Hard alloy layer 1 upper surface looping platform between the hard alloy layer edge, 1 upper surface and the frustum of a cone 3, concrete structure are that the extraneous part looping platform that the frustum of a cone 3 covers is removed in hard alloy layer 1 upper surface.Constitute the multilayer halfpace on the frustum of a cone 3, all around the frustum of a cone 3 lateral wall settings, promptly the sidewall of the frustum of a cone 3 constitutes step structure to the multilayer halfpace.As preferably, the halfpace that the frustum of a cone 3 constitutes is two-layer.The top indent of the frustum of a cone 3 constitutes groove; The frustum of a cone 3 constitutes protruding 4 in groove; Constitute groove between the inside wall of convexity 4 and groove, for the ease of producing and using, the horizontal level of protruding 4 upper surfaces is identical with the horizontal level of the frustum of a cone 3 upper surfaces.

As shown in Figure 2; When the substrate of composite polycrystal-diamond and polycrystalline diamond layer 2 become one, the columned composite polycrystal-diamond of whole formation, so; When being applied in composite polycrystal-diamond on the drill bit; When composite polycrystal-diamond received external impacts, each position of composite polycrystal-diamond was stressed evenly, thereby can avoid composite polycrystal-diamond to separate with polycrystalline diamond layer 2 because of discontinuity between each position causes hard alloy layer 1.

As stated, then can well realize the utility model.

Claims

1. the substrate of composite polycrystal-diamond; It is characterized in that: comprise hard alloy layer (1); Said hard alloy layer (1) constitutes cylindric; Said hard alloy layer (1) upper surface epirelief constitutes the frustum of a cone (3), constitutes the halfpace of multilayer around its sidewall on the said frustum of a cone (3), hard alloy layer (1) the upper surface looping platform between the said frustum of a cone (3) and hard alloy layer (1) edge, upper surface.

2. the substrate of composite polycrystal-diamond according to claim 1; It is characterized in that: the top indent of the said frustum of a cone (3) constitutes groove; The frustum of a cone (3) constitutes convexity (4) in groove; Constitute groove between the inside wall of said convexity (4) and groove, the horizontal level of protruding (4) upper surface is identical with the horizontal level of the frustum of a cone (3) upper surface.

3. the substrate of composite polycrystal-diamond according to claim 1 and 2 is characterized in that: the halfpace that the said frustum of a cone (3) constitutes is two-layer.