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Method for strengthening polycrystalline diamond compact

A technology of polycrystalline diamond and composite sheet, which is applied in the field of materials, can solve the problems of high process risk factor, achieve the effects of reducing risk factor, reducing acidity and improving wear resistance

Active Publication Date: 2020-11-10
YANGTZE UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The existing cobalt removal technology uses the Lewis acid-ferric chloride-hydrochloric acid system or the aqua regia system to remove cobalt at a high temperature of about 200°C to achieve good results, but the process is dangerous under strong acid and strong oxidative high temperature conditions. The coefficient is high, so it is necessary to develop a safe and strong polycrystalline diamond process method

Method used

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  • Method for strengthening polycrystalline diamond compact
  • Method for strengthening polycrystalline diamond compact

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] The method for strengthening the polycrystalline diamond compact comprises the following steps:

[0045] Step S1: immerse the polycrystalline diamond compact in the first decobalt solution to remove cobalt, and soak in the first decobalt solution at 80°C for 20 hours;

[0046] Step S2: immerse the polycrystalline diamond composite sheet after the cobalt removal in step S1 into the first nanometer solution, and soak in the first nanometer solution at 80°C for 20 hours;

[0047] Step S3: immerse the polycrystalline diamond composite sheet impregnated with nanometers in step S2 to remove cobalt in the second decobalt solution, and soak in the second decobalt solution for 24 hours at room temperature;

[0048] Step S4: immerse the polycrystalline diamond composite sheet after the cobalt removal in the step S3 into the second nano solution, and soak in the second nano solution at 80°C for 20 hours;

[0049] Step S5: immerse the polycrystalline diamond composite sheet impreg...

Embodiment 2

[0054]The method for strengthening the polycrystalline diamond compact comprises the following steps at least:

[0055] Step S1: immerse the polycrystalline diamond compact in the first decobalt solution to decobalt, and soak in the first decobalt solution at 80°C for 20 hours;

[0056] Step S2: immerse the polycrystalline diamond composite sheet after the cobalt removal in step S1 into the first nanometer solution, and soak in the first nanometer solution at 80°C for 20 hours;

[0057] Step S3: immerse the polycrystalline diamond composite sheet impregnated with nanometers in step S2 to remove cobalt in the second decobalt solution, and soak in the second decobalt solution for 24 hours at room temperature;

[0058] Step S4: immerse the polycrystalline diamond composite sheet after the cobalt removal in the step S3 into the second nano solution, and soak in the second nano solution at 80°C for 20 hours;

[0059] Step S5: immerse the polycrystalline diamond composite sheet imp...

Embodiment 3

[0067] Example 3 and Example 1 use the same steps to strengthen the polycrystalline diamond composite sheet, but compared with Example 1, the difference is that the decobaltization process in step S1, step S3, and step S5 all uses the first decobalt solution Cobalt removal, the first cobalt removal solution includes a cobalt removal agent, the cobalt removal agent is a mixed solution prepared by dissolving Lewis acid-ferric chloride in hydrochloric acid, and the cobalt removal agent is boron trifluoride-ferric chloride - hydrochloric acid mixed solution, wherein, the addition amount of boron trifluoride-ferric chloride and hydrochloric acid is 14g / 100ml HCl.

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Abstract

The invention provides a method for strengthening a polycrystalline diamond compact. The method comprises the following steps of cobalt removal, specifically, immersing the polycrystalline diamond compact into a cobalt removal solution to remove cobalt; nano permeation, specifically, immersing the cobalt-removed polycrystalline diamond compact into a nano solution, wherein the nano solution is a nano BxCmNn solution; and repeatedly and alternately performing cobalt removal and nano permeation, wherein x is 1 or 4, M is 0, 1 or 2, N is 0 or 1, and m and n are not 0 at the same time. Compared with the prior art, the method disclosed by the invention has the beneficial effects that (1) the polycrystalline diamond compact is strengthened by adopting a cobalt removal and nano permeation alternating method, so that the wear resistance, the impact resistance and the thermal stability can be further improved; (2) the whole process flow is carried out under the condition that the temperature does not exceed 100 DEG C, the acidity of a whole cobalt removal liquid system is reduced, and the danger coefficient of the process is reduced; and (3) two kinds of cobalt removal solutions are adoptedfor alternately performing cobalt removal, so that the strengthening effect is further improved.

Description

technical field [0001] The invention belongs to the field of materials, and in particular relates to a method for strengthening a polycrystalline diamond composite sheet. Background technique [0002] Polycrystalline diamond compact (or PDC) is a composite superhard material with excellent performance. It is formed by sintering micron-sized diamond particles and sintering catalyst on the cemented carbide sink under high temperature and high pressure conditions. Polycrystalline diamond not only retains the high hardness of diamond particles, but also has weldability comparable to alloys. It is widely used in hard material processing, geological drilling, mineral mining, shield construction, oil and gas exploration and other fields. [0003] Sintering aid plays an important role in promoting the preparation of PDC, but it is also an important factor leading to the failure of PDC during use. The commonly used sintering aid for PDC is cobalt, and metal iron, nickel and their al...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B10/46
CPCE21B10/46
Inventor 易先中张仕帆
Owner YANGTZE UNIVERSITY