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Step type clad sheet of CVD diamond layer-diamond impregnated layer-polycrystalline diamond compact layer

A technology of impregnated diamond and polycrystalline diamond, which is applied in the field of stepped composite sheets, can solve problems such as slippery and non-feeding, weakly abrasive formations, and complex matrix, so as to improve the life of the drill bit, improve the service life, and improve the overall performance. Effect

Active Publication Date: 2021-04-06
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

CN105018780A proposes that the diamond bit matrix contains diamond particles, WC, YG6 and a small amount of metals such as Co, Mn, Ti, etc., and it is still necessary to add trace alloy elements and rare earth elements to improve the bonding performance, resulting in complex matrix, uneven mixing, and uneven performance; Easy to slip when drilling into hard, dense and weakly abrasive formations

Method used

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  • Step type clad sheet of CVD diamond layer-diamond impregnated layer-polycrystalline diamond compact layer
  • Step type clad sheet of CVD diamond layer-diamond impregnated layer-polycrystalline diamond compact layer

Examples

Experimental program
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Effect test

Embodiment 1

[0036] A stepped composite sheet comprising CVD diamond layer + impregnated diamond layer + polycrystalline diamond composite sheet, the stepped composite sheet consists of CVD diamond layer 1, impregnated diamond layer 2 and polycrystalline diamond composite sheet from top to bottom in sequence Layer 3 composition. The polycrystalline diamond composite sheet 3 is wrapped by the impregnated diamond layer 2, and the composite sheet of this shape is sintered by using a combination mold with a special configuration. At the same time, the upper surface of the impregnated diamond layer 2 has an exposed polycrystalline diamond composite sheet In the groove of the layer 3, the crystal is planted in the groove between the impregnated diamond layer 2 and the polycrystalline diamond composite sheet 3. The particle size of diamond micropowder used in crystal planting can be nanocrystalline (1-100nm), sub-microcrystalline (0.1-1μm), microcrystalline (1-10μm), fine-grained (10-100μm), coar...

Embodiment 2

[0039]A composite sheet of CVD diamond layer + impregnated diamond layer + polycrystalline diamond composite sheet, the stepped composite sheet is CVD diamond layer 1, impregnated diamond layer 2, and polycrystalline diamond composite sheet 3 in sequence from top to bottom . The CVD diamond layer 1 is in the shape of thin strips. At the same time, the number of thin strips of CVD diamond layers 1 can be 4, 6, 8, etc., and they are uniformly arranged in the impregnated diamond layer 2 in a ring shape. The polycrystalline diamond composite sheet 3 is wrapped by the impregnated diamond layer 2, and the composite sheet of this shape is sintered by using a combination mold with a special configuration. The polycrystalline diamond composite sheet 3 is wrapped by the impregnated diamond layer 2, and the composite sheet of this shape is sintered by using a combination mold with a special configuration. At the same time, the upper surface of the impregnated diamond layer 2 has an expos...

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Abstract

The invention relates to a step type clad sheet of a CVD diamond layer-diamond impregnated layer-polycrystalline diamond compact layer. The step type clad sheet is composed of the polycrystalline diamond compact layer, the diamond impregnated layer and the CVD diamond layer, wherein the diamond impregnated layer wraps around the polycrystalline diamond compact layer, along the drilling direction, a groove for exposing the polycrystalline diamond compact layer is formed in the surface of the front end of the diamond impregnated layer, the CVD diamond layer is arranged on the diamond impregnated layer, and it is ensured that the CVD diamond layer makes contact with a rock stratum firstly during drilling work. Compared with the prior art, the advantages of the CVD diamond layer, the diamond impregnated layer and the polycrystalline diamond compact layer are combined, rock can be quickly broken, the working efficiency is improved, the service life of the whole clad sheet is prolonged, the step type clad sheet has very high social value in the fields of oil drilling, geological drilling, coal field exploitation and the like in the future.

Description

technical field [0001] The invention belongs to the technical field of rock-breaking tool preparation, and relates to a stepped composite sheet comprising a CVD diamond layer-impregnated diamond layer-polycrystalline diamond composite sheet. Background technique [0002] Diamond coating is a new type of functional material in the 21st century. It has high strength, high friction and wear properties, high thermal conductivity and chemical stability, and has wide application prospects. Drill bits are used in drilling engineering to break rocks and form wells. The quality of rock tools seriously affects the quality and speed of drilling. At the same time, because the cost of drill bit replacement is relatively high, it is particularly important to improve the service life of the drill bit. At present, polycrystalline diamond compacts are mostly used in diamond drill tools. [0003] Polycrystalline diamond composite sheet is made by putting cemented carbide matrix and diamond p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B10/46
CPCE21B10/46
Inventor 简小刚胡吉博杨天彭薪颖
Owner TONGJI UNIV