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A method for quickly removing residual cobalt in polycrystalline layer of diamond compact

A technology for a diamond composite sheet and a polycrystalline layer is applied in the field of rapidly removing residual cobalt in a polycrystalline layer of a diamond composite sheet, and can solve the problems of requiring hundreds of hours or more, being unsuitable for mass production, and having low decobalt efficiency. Achieve the effect of improving production efficiency, increasing infiltration, and promoting deep decobalt

Active Publication Date: 2019-04-30
河南亚龙金刚石制品股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the immersion method is often used at home and abroad to remove cobalt residues in the polycrystalline diamond layer. In traditional immersion, as the chemical reaction between acid and metal advances, the residual cobalt metal in the shallow layer of the polycrystalline layer is gradually dissolved by the acid solution, and A series of intricate microscopic pore channels are formed, but as the reaction progresses, the impurities (intermediate phase generated by diamond and metal, SiC, etc.) inside the polycrystalline layer that are not easy to react with acid continue to peel off and accumulate, blocking these pore channels. hindered the progress of deep decobalt
This has led to the low efficiency of the traditional method of cobalt removal. If you want to remove cobalt in deep layers (decobalt removal depth of 0.25mm or more), it often takes hundreds of hours or more, which is extremely unsuitable for mass production.

Method used

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  • A method for quickly removing residual cobalt in polycrystalline layer of diamond compact
  • A method for quickly removing residual cobalt in polycrystalline layer of diamond compact

Examples

Experimental program
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Effect test

Embodiment 1

[0022] A method for quickly removing residual cobalt in the polycrystalline layer of a diamond composite sheet. The specific steps are: put the diamond composite sheet into a closed container filled with an acidic solution system, feed compressed air, keep the pressure for 1-2 hours, and then pressurize the diamond composite sheet. Vacuumize and keep the pressure for 1-2h; then feed compressed air and keep the pressure for 1-2h, then evacuate it and keep the pressure for 1-2h; ..., cycle in turn, take out the diamond composite sheet after 20-30h and rinse it with water That's it.

[0023] That is to say, one cycle is: feed compressed air, keep the pressure for 1-2 hours, then evacuate it, and keep the pressure for 1-2 hours. A total of N such cycles are carried out, 5≤N≤15, N is an integer, and the sum of the holding time is 20-30h.

[0024] The acidic solution system is composed of aqua regia, hydrogen peroxide and nonionic surfactant.

[0025] The acidic solution system is...

Embodiment 2

[0030] A method for quickly removing residual cobalt in the polycrystalline layer of a diamond composite sheet, the specific steps are: put the diamond composite sheet into a closed container filled with an acidic solution system, feed compressed air, and when the pressure value reaches 10KPa, keep the pressure 1h, then evacuate it, when the pressure reaches -10KPa, keep the pressure for 1h; then pass in compressed air, when the pressure reaches 10KPa, keep the pressure for 1h, then evacuate it, when the pressure reaches -10KPa , keep the pressure for 1h; ..., cycle periodically in turn, take out the diamond composite sheet after 20h and rinse it with water, and the measured cobalt removal depth is 0.402mm.

[0031] The acidic solution system is made by mixing 7kg of aqua regia, 1.5kg of hydrogen peroxide and 0.5kg of PE6200.

Embodiment 3

[0033] A method for quickly removing residual cobalt in the polycrystalline layer of a diamond composite sheet, the specific steps are: put the diamond composite sheet into a closed container filled with an acidic solution system, feed compressed air, and when the pressure value reaches 12KPa, keep the pressure 1.2h, and then vacuumize it, when the pressure value reaches -12KPa, keep the pressure for 1.2h; then pass in compressed air, when the pressure value reaches 12KPa, keep the pressure for 1.2h, then evacuate it, when the pressure value reaches At -12KPa, keep the pressure for 1.2h; ..., cycle periodically in turn, take out the diamond composite sheet after 21.6h and rinse it with water, and the measured cobalt removal depth is 0.457mm.

[0034] The acidic solution system is made by mixing 7.2kg of aqua regia, 1.6kg of hydrogen peroxide and 0.6kg of PE6200.

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Abstract

The invention discloses a method for rapidly removing residual cobalt in a polycrystalline layer of diamond compact. The method comprises the specific steps that the diamond compact is put into an airtight container containing an acidic solution system, compressed air is introduced, pressure is maintained for 1-2 hours, then the diamond compact is vacuumized, and the pressure is maintained for 1-2hours; then the compressed air is introduced, the pressure is maintained for 1-2 hours, then the diamond compact is vacuumized, and the pressure is maintained for 1-2 hours; and the steps are repeated for many times, sequential pulse circulation is conducted, and after 20-30 hours, the diamond compact is taken out and rinsed with water. The method for rapidly removing the residual cobalt in the polycrystalline layer of the diamond compact has the beneficial effects that through the method of adding a nonionic surfactant and positive-negative pressure pulsing, deep infiltration of acid liquidto the PDC polycrystalline layer is improved, deep cobalt removal can be realized in a short time, and the production efficiency is greatly improved.

Description

technical field [0001] The invention belongs to the technical field of methods for removing residual metals, in particular to a method for rapidly removing residual cobalt in a polycrystalline layer of a diamond composite sheet. Background technique [0002] Diamond compact (referred to as PDC) is a composite superhard material made of diamond micropowder, cemented carbide matrix and a certain amount of metal catalyst (metal Co, Ni, etc.) as raw materials, sintered under ultra-high pressure and high temperature conditions. Due to its excellent performance, it has become an ideal material for manufacturing drilling bits, cutting tools and other wear-resistant tools. [0003] Although the addition of metal catalyst in the early stage reduces the synthesis conditions and promotes the formation of diamond-diamond bonds, the metal residue in polycrystalline diamond after sintering also has an adverse effect on the use of later products. When PDC is subjected to high temperature ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F3/24
CPCB22F3/24B22F2003/244
Inventor 花波波陈强张钲王恒李富玲
Owner 河南亚龙金刚石制品股份有限公司