Method for removing cobalt from polycrystalline diamond clad sheet

A polycrystalline diamond and composite sheet technology, which is applied in the field of cobalt removal from polycrystalline diamond composite sheets, can solve the problems of high sealing requirements for the substrate of the composite sheet, high volatility and corrosion of strong acids, and large irritation to operators. Achieve the effects of less corrosion, less damage to the working environment, and less destructiveness

Inactive Publication Date: 2016-05-25
CHANGSHA DIAT NEW MATERIAL SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The above method has a significant effect on removing cobalt from polycrystalline diamond composite sheets, but strong acids such as hydrochloric acid, nitric acid, and hydrofluoric acid are too volatile and corrosive, which is very irritating to operators and the working environment is harsh; Heating, which is more volatile and requires higher sealing requirements for the matrix part of the composite sheet, which is not conducive to application

Method used

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  • Method for removing cobalt from polycrystalline diamond clad sheet
  • Method for removing cobalt from polycrystalline diamond clad sheet
  • Method for removing cobalt from polycrystalline diamond clad sheet

Examples

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Effect test

Embodiment 1

[0036] Prepare a 1mol / L phosphoric acid solution, and add 10mL of 30% hydrogen peroxide solution per 100mL to prepare a decobalt acid solution.

[0037] The 1913 specification polycrystalline diamond composite sheet (Changsha Dailer New Material Technology Co., Ltd.) was used as the object of cobalt removal, and the cobalt content (mass percentage, the same below) in the polycrystalline layer of the composite sheet before decobalization was 8%. First, seal the base part of the composite sheet with tooling for anti-corrosion protection, then place the polycrystalline diamond layer of the above composite sheet in a decobalt solution and soak at 25°C for 48 hours.

[0038] The morphology of the composite sheet before and after cobalt removal was observed by scanning electron microscope, and the cobalt removal depth was measured. See results figure 1 , figure 2 and image 3 , figure 1 It is the scanning electron micrograph of the composite sheet before the cobalt removal in E...

Embodiment 2

[0043] Prepare a 1mol / L phosphoric acid solution, and add 20mL of 30% hydrogen peroxide solution per 100mL to prepare a decobalt acid solution.

[0044] Using the same decobalt object as in Example 1, the polycrystalline diamond layer was placed in the decobalt solution and soaked at 25° C. for 48 hours.

[0045] According to the same detection method as in Example 1, the measured cobalt removal depth was 350 μm. Continue to soak for 72 hours, the cobalt removal depth is 600 μm, and the remaining cobalt content is less than 2wt%.

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Abstract

The invention provides a method for removing cobalt from a polycrystalline diamond clad sheet. The method comprises the steps that acid liquor is provided and includes phosphoric acid and hydrogen peroxide; a polycrystalline diamond layer of the polycrystalline diamond clad sheet is soaked in the acid liquor to obtain a clad sheet without cobalt. According to the method, phosphoric acid is used for removing the cobalt phase in polycrystalline diamond, phosphate anions and cobalt ions can form stable soluble coordination ions, and therefore cobalt is promoted to continuously enter the solution to be removed from the clad sheet; moreover, hydrogen peroxide is added, so that the removal rate of cobalt is further increased. As a result, through the method for removing cobalt from the polycrystalline diamond clad sheet, the amount of volatilized irritant gas is small, corrosion to a seal of equipment and the clad sheet is small, damage to a base body seal is small, and harm to the working environment is small; meanwhile, a high cobalt removal rate is achieved, cost is lowered, and large-scale application is easy to realize.

Description

technical field [0001] The invention relates to the technical field of polycrystalline diamond composite sheets, in particular to a method for removing cobalt from polycrystalline diamond composite sheets. Background technique [0002] Polycrystalline diamond compact (PDC) is widely used in petroleum and geological drilling and metal cutting. Generally speaking, it is a cemented carbide matrix and diamond powder sintered at high temperature and high pressure (such as 1400 ° C, 4.5GPa ~ 7GPa). The resulting functional composite crystal material includes a cemented carbide substrate and a polycrystalline diamond layer (also called a polycrystalline layer) compounded on the substrate. In the production process, 5-10% cobalt powder is usually mixed in the diamond powder to promote the formation of polycrystalline diamond from the diamond powder. However, the cobalt phase in the polycrystalline layer is harmful when the composite sheet is used. Cobalt will accelerate the graphit...

Claims

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Application Information

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IPC IPC(8): C23F1/28
CPCC23F1/28
Inventor 周明段志明匡怡新
Owner CHANGSHA DIAT NEW MATERIAL SCI & TECH
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