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A kind of high temperature and wear-resistant polycrystalline diamond composite sheet and its preparation method

A polycrystalline diamond and composite sheet technology, applied in the field of materials science, can solve the problems of low bulk density, poor impact resistance, low wear resistance, etc., and achieve the effects of increasing the footage capability, reducing chipping and prolonging the service life.

Active Publication Date: 2022-01-04
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The PDC composite sheet sintered with small particle size diamond powder has good wear resistance, but poor impact resistance; single particle size diamond powder has a small bulk density, and the sintered polycrystal has large pores and low wear resistance. The larger the proportion of , the more obvious this result

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] A method for preparing a high-temperature and wear-resistant polycrystalline diamond composite sheet, comprising the following steps:

[0055] Step 1. Prepare raw materials:

[0056] ① Treat the surface of the diamond powder to remove impurities on the surface of the diamond powder;

[0057] The specific process is as follows: firstly, the diamond powder and the concentrated NaOH solution with a mass fraction of 35% are placed in a beaker, the volume ratio of the diamond powder and the concentrated NaOH solution with a mass fraction of 35% is 1:2, and the ℃ for 45 minutes, rinse at room temperature until the solution is neutral; then concentrated hydrochloric acid (HCl) and concentrated nitric acid (HNO 3 ) The mixture composed of aqua regia and diamond powder treated with concentrated NaOH solution in a volume ratio of 3:1 is placed on a magnetic stirrer and heated for 80 minutes, and finally washed to neutrality under normal temperature conditions, dried, and set asi...

Embodiment 2

[0067] A method for preparing a high-temperature and wear-resistant polycrystalline diamond composite sheet, comprising the following steps:

[0068] Step 1. Prepare raw materials:

[0069] ① Treat the surface of the diamond powder to remove impurities on the surface of the diamond powder;

[0070] The specific process is as follows: firstly, the diamond powder and the concentrated NaOH solution with a mass fraction of 35% are placed in a beaker, the volume ratio of the diamond powder and the concentrated NaOH solution with a mass fraction of 35% is 1:2, and the ℃ for 45 minutes, rinse at room temperature until the solution is neutral; then concentrated hydrochloric acid (HCl) and concentrated nitric acid (HNO 3 ) The mixture composed of aqua regia and diamond powder treated with concentrated NaOH solution in a volume ratio of 3:1 is placed on a magnetic stirrer and heated for 80 minutes, and finally washed to neutrality under normal temperature conditions, dried, and set asi...

Embodiment 3

[0080] A method for preparing a high-temperature and wear-resistant polycrystalline diamond composite sheet, comprising the following steps:

[0081] Step 1. Prepare raw materials:

[0082] ① Treat the surface of the diamond powder to remove impurities on the surface of the diamond powder;

[0083] The specific process is as follows: firstly, the diamond powder and the concentrated NaOH solution with a mass fraction of 35% are placed in a beaker, the volume ratio of the diamond powder and the concentrated NaOH solution with a mass fraction of 35% is 1:2, and the ℃ for 45 minutes, rinse at room temperature until the solution is neutral; then concentrated hydrochloric acid (HCl) and concentrated nitric acid (HNO 3 ) The mixture composed of aqua regia and diamond powder treated with concentrated NaOH solution in a volume ratio of 3:1 is placed on a magnetic stirrer and heated for 80 minutes, and finally washed to neutrality under normal temperature conditions, dried, and set asi...

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Abstract

A high-temperature and wear-resistant polycrystalline diamond composite sheet and a preparation method thereof belong to the field of materials science. The polycrystalline diamond composite sheet is composed of fullerene-plated diamond fine powder, boron-doped diamond fine powder, boron carbide fine powder and nano-diamond fine powder The mixed powder is used as a raw material, and is prepared by sintering with cemented carbide under the conditions of a pressure of 6.2GPa~7.2GPa and a temperature of 1620℃~1780℃ by using a six-sided top press. 75wt% to 85wt% of diamond micropowder, 5wt% to 10wt% of boron-doped diamond micropowder, 5wt% to 10wt% of boron carbide micropowder and 2wt% to 5wt% of nano diamond micropowder. The polycrystalline diamond composite sheet used in the field of drilling is prepared by the invention, and the compactness, hardness, wear resistance and thermal stability of the polycrystalline diamond composite sheet are improved.

Description

technical field [0001] The invention belongs to the field of materials science, and in particular relates to a high-temperature and wear-resistant polycrystalline diamond composite sheet and a preparation method thereof. Background technique [0002] Diamond has various excellent properties and is widely used in various fields. However, diamond has poor thermal stability under normal pressure. Polycrystalline diamond compact (PDC) is a kind of superhard composite material made of diamond micropowder as raw material, which is firmly combined with cemented carbide substrate under high temperature and high pressure conditions. Because it has the high hardness of diamond And high wear resistance, but also has high toughness and weldability of cemented carbide, it is widely used in oil and gas drilling, mineral deposit exploration, cutting processing and other fields. During the drilling process of hard and abrasive formations, high contact pressure and high abrasiveness of the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B10/46B01J3/06C23C14/06C23C14/35
CPCE21B10/46B01J3/062B01J3/067C23C14/0605C23C14/35C23C14/223B01J2203/062
Inventor 刘宝昌陈朝然
Owner JILIN UNIV
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