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Method for manufacturing polycrystalline diamond compact (PDC) by using vacuum brazing technology

A technology of diamond composite sheet and diamond micropowder, which is applied in the process of applying ultra-high pressure, can solve the problems of unstable quality, low yield, and weak bonding between diamond and matrix, and achieves easy penetration, not easy to fall off, and bonding force. strong effect

Active Publication Date: 2011-05-04
HENAN FAMOUS DIAMOND IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is that there are a large number of pinholes on the surface of the existing diamond composite sheet, the combination of the diamond and the matrix is ​​not firm, the yield rate is low, and the quality is unstable. Stable method for manufacturing diamond compacts using vacuum brazing technology

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] The present invention is carried out with following steps:

[0015] (a) putting the cemented carbide substrate and the metal indium sheet that are added with diamond micropowder into the mold successively;

[0016] (b) Vacuum to 1×10 -3 pa;

[0017] (c) heating at 160° C. for 30 minutes;

[0018] (d) Synthesized using a six-sided diamond press at 1450°C and 5.5GPa pressure

[0019] The mass content of cobalt in the tungsten carbide-cobalt cemented carbide matrix is ​​10%.

[0020] In the step (a) of the present invention, the cemented carbide substrate is in the shape of a cup, and the diamond micropowder is put into the cup of the cemented carbide substrate, and metal indium is put into the cup mouth to make a binding agent, after steps (b), (c) , After heating and pressing in (d), a diamond composite sheet is formed. The bonding force between diamond and alloy matrix is ​​strong, and it is not easy to fall off.

Embodiment 2

[0022] The present invention is carried out with following steps:

[0023] (a) putting the cemented carbide substrate and the metal indium sheet that are added with diamond micropowder into the mold successively;

[0024] (b) Vacuum to 4×10 -3 pa;

[0025] (c) heating at 164° C. for 26 minutes;

[0026] (d) It was synthesized using a six-sided top diamond press at 1455°C and a pressure of 5.4GPa.

[0027] The mass content of cobalt in the tungsten carbide-cobalt cemented carbide matrix is ​​12%.

[0028] Others are with embodiment 1.

Embodiment 3

[0030] The present invention is carried out with following steps:

[0031] (a) putting the cemented carbide substrate and the metal indium sheet that are added with diamond micropowder into the mold successively;

[0032] (b) Vacuum to 8×10 -3 pa;

[0033] (c) heating at 168° C. for 22 minutes;

[0034] (d) It was synthesized using a six-sided top diamond press at 1460°C and a pressure of 5.4GPa.

[0035] The mass content of cobalt in the tungsten carbide-cobalt cemented carbide matrix is ​​14%.

[0036] Others are with embodiment 1.

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Abstract

The invention discloses a method for manufacturing a polycrystalline diamond compact (PDC) by using a vacuum brazing technology, belonging to the technical field of the manufacturing of superhard material tools. The method comprises the following steps of: (a) sequentially placing a hard alloy matrix added with diamond micropowder and a metal indium sheet in a mould; (b) vacuumizing; (c) heating; and (d) synthesizing by using a hexahedron diamond press under a temperature of 1450-1500DEG C and a pressure of 5.0-5.5GPa. In the invention, metal indium with low melting point is used as a binder, so that the brazing of a shielding material can be realized under a lower temperature and the diamond and the hard alloy matrix can be in a vacuum state. In the vacuum state, the penetration of cobalt is relatively easy, and the binding force between the diamond and the alloy matrix is strong and not easy to separate. For the PDC with a diamond grit less than 10 microns, the yield of the product in the prior art is within 60%; and by adopting the scheme in the invention, the yield can achieve 80% or more.

Description

technical field [0001] The invention belongs to the technical field of superhard material tool manufacturing, and in particular relates to a method for preparing a diamond composite sheet. Background technique [0002] As a new type of superhard material product, diamond compact (PDC) has been widely used in many fields of petroleum, geology, coal mining, drilling and mechanical processing. Brazing is a welding method that uses a metal material with a lower melting point than the substrate as a binder, and uses a liquid state to wet the substrate and fill the interface gap between the workpiece and make it interdiffused with the substrate. The manufacturing principle of the existing brazed PDC is as follows: under the conditions of high temperature (1450°C) and high pressure (5.5GPa), the diamond will be partially graphitized during the sintering process. The diamond transports the carbon, allowing the diamond grains to grow and overlap. The process of cobalt liquid infilt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J3/06
Inventor 李建林朱长福李洪波邹泽宏
Owner HENAN FAMOUS DIAMOND IND CO LTD
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