CVD diamond layer overlapped diamond composite sheet for drilling and its production method

A technology of diamond composite sheet and diamond layer, which is applied in the field of diamond composite sheet for drilling and its production, can solve the problems of reduced impact resistance, PDC bit teeth that cannot achieve wear resistance and service life, and improve temperature resistance and durability. Effects of abrasiveness and service life improvement

Inactive Publication Date: 2009-07-08
陈继锋
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] Although the method of this patent has improved the performance of PDC bit teeth to a great extent, but because there are many micropores in the PCD surface, its i...

Method used

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  • CVD diamond layer overlapped diamond composite sheet for drilling and its production method

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Comparison scheme
Effect test

Embodiment 1

[0018] Embodiment 1: as figure 1 As shown, a diamond composite sheet for drilling covered with CVD diamond coating is deposited and covered with a 0.01-2mm thick CVD diamond film 3 on the PCD surface 2 of the PDC sheet 1 by chemical vapor deposition.

[0019] A method for manufacturing a diamond composite sheet for drilling covered with a CVD diamond layer, comprising the step of removing cobalt from the PCD layer before depositing the CVD diamond film;

[0020] Proceed as follows:

[0021] Immerse the diamond layer of PCD in 1:3 nitric acid aqueous solution (or other decobalt solution) for half an hour (or longer);

[0022] or with 2.5% CO-H 2 Plasma (other active plasma) selectively etches Co;

[0023] Or use Ar ion sputtering to etch the PCD surface to reduce the Co content;

[0024] A 0.01-2mm thick CVD diamond film is deposited on the PCD surface of the PDC sheet by chemical vapor deposition;

[0025] Proceed as follows:

[0026] Put the surface-treated PCD sheet on...

Embodiment 2

[0027] Embodiment 2: a kind of diamond composite sheet manufacturing method for drilling covering the CVD diamond layer does not carry out the cobalt-removing step to the PCD layer before depositing the CVD diamond film;

[0028] Proceed as follows:

[0029] Put the PCD sheet on the substrate table of the vacuum chamber, control the surface temperature of the PCD below 500°C, and use chemical vapor deposition methods such as microwave plasma, DC glow discharge plasma, plasma jet, hot wire method, etc., to deposit The carbon-containing gas source (or liquid source) is decomposed, and a 0.01-2mm thick CVD diamond film is deposited on the PCD surface.

Embodiment 3

[0030] Embodiment 3: A method for making a diamond composite sheet for drilling covered with a CVD diamond layer, deposited in an atmospheric environment;

[0031] Put the PCD sheet on the substrate table in the atmospheric atmosphere, use arc discharge, multi-laser beam and other chemical vapor deposition methods to decompose the carbon-containing gas source (or liquid source), and deposit a layer of 0.01-2mm thick on the PCD surface. CVD diamond film.

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Abstract

The invention relates to a diamond compact for drilling to cover a CVD diamond coating and a preparing method thereof. The novel diamond compact is prepared from a new material by depositing a layer of diamond film on the surface of the prior diamond compact through chemical vapor deposition methods. The preparing method is disclosed as figure 1, a CVD diamond film 3 with the thickness of between 0. 01 and 2 mm is deposited and covered on the PCD surface 2 of a PDC sheet. The method for preparing the diamond compact adopts the vapor deposition methods of a microwave plasma method, a direct current glow-discharged plasma method, a plasma injection method, a heat wire method, an arc discharge method, a multiple laser beam assistance decomposition method, and the like. Carbon-containing gas or carbon-containing liquid is decomposed, and a CVD diamond film with the thickness of bwteen 0.01 and 2mm is deposited on the PCD surface which is treated. The obtained new material greatly improves the temperature resistance and the wearability of the prior diamond compact, thereby the service life of a drill bit made of the new material is prolonged greatly. The diamond compact can be widely used in drilling industry, construction industry and machining operation industry.

Description

technical field [0001] The invention relates to a diamond composite sheet for drilling covered with a CVD diamond layer and a manufacturing method thereof, belonging to the field of machinery and tools. Background technique [0002] Diamond composite sheet (English Polycrystalline Diamond Composite, usually abbreviated as PDC), its structure is a cylindrical cemented carbide, one end of the cemented carbide is closely connected to a layer of flat or spherical polycrystalline diamond (Polycrystalline Diamond, usually referred to as PDC). for PCD). The manufacturing process is to use a special structure and method to assemble cemented carbide and diamond powder together, using high temperature and high pressure to make the cobalt in the cemented carbide become liquid and penetrate into the diamond powder, and make the diamond powder bond with each other to form cemented carbide Tightly bonded polycrystalline diamond layers. [0003] Cobalt is the catalyst for the mutual conv...

Claims

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Application Information

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IPC IPC(8): E21B10/46C23C16/27C23C16/44C23C16/50
Inventor 陈继锋
Owner 陈继锋
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