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Impact-resistant diamond carbide composite sheet

A technology of cemented carbide and cemented carbide matrix, which is applied in the field of engineering excavation and oil drilling to achieve the effect of enhanced bonding force

Active Publication Date: 2017-04-26
WUHAN NINESTONES SUPERABRASIVES CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are still some things worth improving in this kind of conical convexity, especially under the impact of external force, the problem of stress expansion at the edge of the conical convexity still exists

Method used

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  • Impact-resistant diamond carbide composite sheet
  • Impact-resistant diamond carbide composite sheet
  • Impact-resistant diamond carbide composite sheet

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] The composite sheet of this embodiment has a diameter of 15.88mm and a total height of 13.2mm. The side surface of the interface boss is wavy, and there are a plurality of hemispherical small protrusions on the top surface of the interface. Use the finite element analysis software Abacus to analyze the residual thermal stress at the interface between the diamond layer and the cemented carbide structure, see Figure 4 . The circumferential stress of the interface of the present invention (the left of the figure) is from -4534MPa to 1347MPa, and the circumferential stress of the common boss structure of the comparative example (the right of the figure) is from -3480MPa to 1782MPa. Examples show that, compared with the comparative example, the present invention has increased circumferential compressive stress, decreased circumferential tensile stress, and improved circumferential stress distribution.

[0034] The composite sheet of Example 1 was clamped on the fixture wi...

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PUM

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Abstract

The invention discloses a novel-structure diamond hard alloy composite sheet, which comprises a polycrystalline diamond layer and a hard alloy base body, wherein diamond powder and the hard alloy base body are assembled together; the diamond powder is sintered under high-pressure and high-temperature conditions for forming the polycrystalline diamond layer, and the polycrystalline diamond layer and the hard alloy base body form the diamond hard alloy composite sheet; a cylindrical lug boss is arranged on an assembly interface of the hard alloy base body; the top end surface of the lug boss is provided with dot matrix type hemispherical bulges; the upper edge and the lower edge of the cylindrical lug boss are of wave-shaped step structures; and the lower edges are greater than the upper edges. The area of the lug boss of the interface of the composite sheet provided by the invention is greater than the area of a conventional cylindrical lug boss, and the bonding force between the polycrystalline diamond and the hard alloy is also enhanced. The stress expansion due to radial impact is also relieved through a continuous wave-shaped structure at the side surface of the lug boss, so that the impact-resistant performance of the composite sheet is improved.

Description

technical field [0001] The invention belongs to the technical field of petroleum drilling and engineering excavation, and in particular relates to a diamond carbide composite sheet with a new structure. Background technique [0002] Diamond carbide composite sheet (hereinafter referred to as "composite sheet") is sintered by diamond powder and cemented carbide substrate under ultra-high pressure and high temperature conditions, in which the polycrystalline diamond layer is the wear-resistant working layer, and the cemented carbide substrate plays a supporting role. . The composite sheet not only has the characteristics of high hardness and high wear resistance of diamond, but also has the characteristics of high strength, impact toughness and good weldability of cemented carbide. It is used in oil and gas drilling, geological drilling, engineering drilling, coal mining, etc. fields are widely used. [0003] With the development of the drilling and mining industry, higher r...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B10/46
Inventor 肖湘平
Owner WUHAN NINESTONES SUPERABRASIVES CO LTD