Polycrystalline diamond composite sheet and its preparation method

A technology of polycrystalline diamond and composite sheet, which is applied in drilling equipment, earthwork drilling, drill bits, etc., to achieve high social value and economic benefits, good thermal stability, and simple methods

Active Publication Date: 2017-05-17
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 kind of preparation method of conventional traditional polycrystalline diamond compact sheet, and this preparation method comprises the following steps:

[0029] 1) The diamond powder with a particle size of 6-12 μm and the metal catalyst Co powder with a particle size of 1-3 μm are ball-milled and mixed, then put into a metal cup molybdenum that acts as a shield, and then put into a tungsten-cobalt cemented carbide matrix; and After other metal cups are assembled, an assembly block is formed; the assembly block is vacuumed at 6.0×10 -2 Pa, a temperature of 500°C, and a vacuum heat treatment for 2 hours 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 carry out high-temperature and high-pressure synthesis under the conditions of sintering pressure 5.2 GPa, sintering temperature 1400 ° C, and holding time 10 min....

Embodiment 1

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

[0034] Step 1, using the conventional polycrystalline diamond composite sheet prepared by the method provided in the above comparative test 1 as the crude polycrystalline diamond composite sheet;

[0035] Step 2, using liquid epoxy resin to inject and mold a layer of epoxy resin plastic layer on the surface of the crude polycrystalline diamond composite sheet, and then peel off and remove the epoxy resin plastic layer formed on the surface of the polycrystalline diamond layer. layer;

[0036] Step 3: Mix nitric acid and hydrofluoric acid at 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 with the boiled mixed acid for 8 h to remove all The metal catalyst Co in the upper surface of the polycrystalline diamond layer precursor makes t...

no. 2 example

[0040] Comparative test 2

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

[0042] The structures of the precursors of the polycrystalline diamond layer in the conventional polycrystalline diamond compact obtained in comparative test 2 and comparative test 1 are basically the same. The transverse fracture toughness of the conventional polycrystalline diamond composite sheet obtained...

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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 in particular relates to a polycrystalline diamond composite sheet and a preparation method thereof. Background technique [0002] Diamond compacts are usually made by assembling diamond powder with a certain amount of catalyst added to a cemented carbide substrate, then installing it on a special diamond hydraulic press, and sintering it under ultra-high temperature and high pressure conditions. It consists of a layer of polycrystalline diamond layer and cemented carbide substrate. Due to the high hardness and good wear resistance of the polycrystalline diamond layer, coupled with the good toughness and weldability of the cemented carbide substrate, it is used in oil drilling and geological drilling. And coal mining applications have been widely used. [0003] In the production process of the existing polycrystalline diamond composite sheet, cobalt, nickel, iron and other metals are often...

Claims

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Application Information

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