A method for removing part of metal cobalt in polycrystalline diamond composite sheet by electrolysis

A technology of polycrystalline diamond and composite sheet, which is applied in the field of cobalt removal, to achieve the effects of improving heat resistance and wear resistance, small impact, and convenient operation

Inactive Publication Date: 2017-04-05
JILIN UNIV
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0003] The purpose of the present invention is to solve the above-mentioned problems existing in the method for removing part of the cobalt metal in the polycrystalline diamond compact, and provide a method for electrolytically removing part of the cobalt metal in the polycrystalline diamond compact

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  • A method for removing part of metal cobalt in polycrystalline diamond composite sheet by electrolysis

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Embodiment Construction

[0010] see figure 1 As shown in the figure, using the basic working principle of electrolytic metal, the polycrystalline diamond composite sheet is used as the object of electrolysis, and the cobalt in the polycrystalline diamond composite sheet is removed by using electrolyte, electrolysis device, inert cathode and regulating voltage to obtain a decobalt Polycrystalline diamond compacts.

[0011] The device used in the method is composed of an electrolysis device 1, an electrolyte 2 and a beaker 3, the electrolysis device 1 is arranged in the beaker 3, and the lower end of the electrolysis device 1 is immersed in the electrolyte;

[0012] The electrolysis device 1 includes a power source 11, a first wire 12, a second wire 13, a protective shielding material 14, a cemented carbide substrate 15, a polycrystalline diamond layer 16, an inert metal 17 and a cathode shielding material 18. The two wires 13 are respectively fixed on both ends of the power supply 11 , the lower end o...

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Abstract

The invention discloses a method for removing partial metal cobalt in a polycrystalline diamond compact by an electrolytic method. A device for the method comprises an electrolytic device, an electrolyte and a beaker, wherein the electrolytic device is arranged in the beaker, and the lower end of the electrolytic device is soaked in the electrolyte. The method comprises the steps of preparing the electrolyte, removing the cobalt in the diamond compact via the electrolytic device, taking a cathode as an inert metal and an anode as a polycrystalline diamond layer, regulating voltage according to the size of the diamond compact adopted in an electrolytic process, and gradually removing the partial metal cobalt in the polycrystalline diamond compact with normal proceeding of a reaction. The method is simple in structure and convenient to implement, and safer and more reliable than an acid etching technique, has high cobalt removal efficiency, short cobalt removal working time, small influence on other structures of the polycrystalline diamond compact and no pollution, and can improve thermal resistance and abrasive resistance of the polycrystalline diamond compact, a manufactured diamond tool has high overall performance and long service life, and the method is suitable for industrial production, popularization and application.

Description

technical field [0001] The invention relates to a method for removing cobalt, in particular to a method for removing part of metallic cobalt in a polycrystalline diamond composite sheet by an electrolytic method. Background technique [0002] Polycrystalline diamond compact (PDC) is made of high-quality diamond powder and cemented carbide matrix (WC-Co) as raw materials, sintered under ultra-high pressure and high temperature conditions. When the sintering temperature rises above 1300°C, the cobalt (Co) in the cemented carbide matrix begins to melt and enter the voids between the diamond powders, and at the same time, under the action of high pressure, the formation of diamond-diamond bonds (D-D bonds) is promoted. , that is, to form a polycrystalline diamond sintered body. After the sintering is completed, a certain amount of metallic cobalt will generally remain in the diamond layer of the composite sheet. When the PDC is subjected to high temperature again, since cobalt ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25F3/02
Inventor 刘宝昌刘时琦陈朝然孙永辉
Owner JILIN UNIV
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