Polycrystalline diamond compact and preparation method thereof

A polycrystalline diamond and composite sheet technology, applied in drilling equipment, earthwork drilling, drill bits, etc., to achieve high social value and economic benefits, easy operation, and improved high temperature resistance.

Active Publication Date: 2015-08-26
FUNIK ULTRAHARD MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of this, the purpose of the present invention is to provide a polycrystalline diamond compact and preparation method thereof, to overcome the defects and deficiencies of existing polycrystalline diamond compacts

Method used

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Examples

Experimental program
Comparison scheme
Effect test

no. 1 example

[0027] Comparative test 1

[0028] Comparative test 1 provides a conventional method for preparing a conventional polycrystalline diamond composite sheet, which includes the following steps:

[0029] 1) After ball milling the diamond powder with a particle size of 6-12 μm and the metal catalyst Co powder with a particle size of 1 to 3 μm, put it into the shielding metal cup molybdenum, and then put it into the tungsten-cobalt cemented carbide matrix; and After other metal cups are assembled, an assembly block is formed; put the assembly block at a vacuum of 6.0×10 -2 Pa, a temperature of 500℃, and a vacuum heat treatment for 2 h to obtain a heat-treated assembly block;

[0030] 2) Put the heat-treated assembly block obtained in step 1) into the pressure transmission medium and perform high-temperature and high-pressure synthesis under the conditions of a sintering pressure of 5.2 GPa, a sintering temperature of 1400°C, and a holding time of 10 min. The polycrystalline diamond layer...

Embodiment 1

[0033] Embodiment 1 of the present invention provides a method for preparing a polycrystalline diamond composite sheet, which mainly includes the following steps:

[0034] Step 1. The conventional polycrystalline diamond composite sheet prepared by the method provided in the above comparative experiment 1 is used as the crude polycrystalline diamond composite sheet;

[0035] Step 2: Use liquid epoxy resin to first inject and form a layer of epoxy resin plastic on the surface of the crude polycrystalline diamond composite sheet, and then peel off and remove the epoxy plastic formed on the surface of the polycrystalline diamond layer Floor;

[0036] Step 3: Mix nitric acid and hydrofluoric acid in a volume ratio of 1:1 to make a mixed acid, boil the mixed acid, and rinse the upper surface of the polycrystalline diamond layer precursor for 8 h with the boiling mixed acid to remove all The metal catalyst Co in the upper surface of the polycrystalline diamond layer precursor transforms t...

no. 2 example

[0040] Comparative test 2

[0041] Comparative test 2 provides a conventional traditional polycrystalline diamond composite preparation method. The preparation method provided in Comparative Test 2 is basically the same as the preparation method provided in Comparative Test 1, except that: in step 1), The particle size of diamond powder is 15-25 μm, the cemented carbide substrate is tungsten-titanium-cobalt cemented carbide substrate, metal cup tantalum; the vacuum degree of vacuum heat treatment of the assembly block is 8.0×10 -2 Pa, temperature 700℃, heat treatment time 5 h; in step 2), the sintering pressure used is 5.5 GPa, the sintering temperature is 1500℃, and the holding time is 15 min.

[0042] The structure of the polycrystalline diamond layer precursor in the conventional polycrystalline diamond composite sheet obtained in Comparative Experiment 2 and Comparative Experiment 1 is basically the same. The transverse fracture toughness of the conventional polycrystalline di...

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Abstract

The invention provides a polycrystalline diamond compact and a preparation method thereof. The polycrystalline diamond compact comprises a cemented carbide substrate layer and a polycrystalline diamond layer synthesized on the cemented carbide substrate layer, wherein the upper surface of the polycrystalline diamond layer is a pure polycrystalline diamond layer formed by diamond. The invention further provides the preparation method of the polycrystalline diamond compact. The preparation method is characterized by adopting an acid pickling method for removing a metal catalyst on the upper surface of a precursor of the polycrystalline diamond in the conventional polycrystalline diamond compact. The polycrystalline diamond compact provided by the invention is better in abrasive resistance and higher in heat stability, and the preparation method provided by the invention is simple and easy to operate.

Description

Technical field [0001] The invention belongs to the field of superhard materials, and specifically relates to a polycrystalline diamond composite sheet and a preparation method thereof. Background technique [0002] Diamond composites are usually made by assembling diamond powder with a certain amount of catalyst and a cemented carbide matrix, and then mounted on a special diamond hydraulic press, and sintered under ultra-high temperature and high pressure conditions. It is composed of a polycrystalline diamond layer and a cemented carbide substrate. Due to the high hardness and wear resistance of the polycrystalline diamond layer, coupled with the good toughness and weldability of the cemented carbide substrate, it is used in petroleum drilling and geological drilling. It is widely used in coal mining applications. [0003] In the production process of the existing polycrystalline diamond composite sheet, cobalt, nickel, iron and other metals are often used as the bonding agent t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B10/46B22F7/06B22F1/00
Inventor 王彬彬
Owner FUNIK ULTRAHARD MATERIAL
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