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Polycrystalline diamond clad sheet and preparation method thereof

A polycrystalline diamond and composite sheet technology, applied in chemical instruments and methods, metal layered products, layered products, etc., can solve the problems of improving the thermal conductivity of polycrystalline diamond sheets and reducing the wear resistance of polycrystalline diamond sheets, etc. To achieve the effect of weakening graphitization, the preparation method is simple and easy to operate, and the impact resistance is good

Pending Publication Date: 2018-04-03
SHENZHEN INST OF ADVANCED TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In view of the above problems, in the prior art, someone adds a self-supporting diamond film to the polycrystalline diamond layer to improve the thermal conductivity of the polycrystalline diamond sheet, but it still cannot uniformly improve the thermal conductivity of the polycrystalline diamond sheet, and the cemented carbide The cobalt element in the matrix will still have a graphite catalytic effect on the polycrystalline diamond layer, which greatly reduces the wear resistance of the polycrystalline diamond sheet

Method used

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  • Polycrystalline diamond clad sheet and preparation method thereof
  • Polycrystalline diamond clad sheet and preparation method thereof
  • Polycrystalline diamond clad sheet and preparation method thereof

Examples

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preparation example Construction

[0035] Please refer to image 3 , the preparation method of the polycrystalline diamond compact 100 according to the embodiment of the present invention provided by the embodiment of the present invention includes the following steps:

[0036] Step 1: cutting the self-supporting diamond film 21 into a first columnar self-supporting diamond film 211 and a plurality of second columnar self-supporting diamond films 212, the cross-sectional area of ​​the first columnar self-supporting diamond film 211 is greater than that of the second columnar self-supporting diamond film The area of ​​film 212 cross sections; Preferably, get commercially available self-supporting diamond film 21 or the self-supporting diamond film 21 prepared by chemical vapor deposition, it is cut into the first columnar self-supporting diamond film of different sizes to be used 211 and a plurality of second columnar self-supporting diamond films 212.

[0037] Step 2: Place a first columnar self-supporting dia...

Embodiment 1

[0043] A preparation method of a polycrystalline diamond compact, comprising the following steps:

[0044] Step 1: Using a laser cutting machine to cut the self-supporting diamond film 21 obtained by chemical vapor deposition into a first self-supporting diamond film cylinder 211 and a plurality of second self-supporting diamond film cylinders 212 . Wherein the first self-supporting diamond film cylinder 211 has a diameter of 4 mm and a height of 0.5 mm, and the second self-supporting diamond film cylinder has a diameter of 1 mm and a height of 0.5 mm.

[0045] Step 2: First mix the diamond micropowder and boron carbide powder evenly. Wherein the mass ratio of diamond powder and boron carbide powder is 3:1, the grain size of diamond powder is 5 μ m, and the grain size of boron carbide powder is 5 μ m; secondly, a first self-supporting diamond film cylinder 211 and a plurality of second A self-supporting diamond film cylinder 212 is placed vertically in a metallic molybdenum c...

Embodiment 2

[0048] A preparation method of a polycrystalline diamond compact, comprising the following steps:

[0049] Step 1: Using a laser cutting machine to cut the self-supporting diamond film 21 obtained by chemical vapor deposition into a first self-supporting diamond film cylinder 211 and a plurality of second self-supporting diamond film cylinders 212 . The first self-supporting diamond film cylinder 211 has a diameter of 6 mm and a height of 1.5 mm, and the second self-supporting diamond film cylinder has a diameter of 1.5 mm and a height of 1.5 mm.

[0050] Step 2: First mix the diamond micropowder and boron carbide powder evenly. Wherein the mass ratio of diamond powder and boron carbide powder is 6:1, the grain size of diamond powder is 35 μ m, and the grain size of boron carbide powder is 7 μ m; secondly, a first self-supporting diamond film cylinder 211 and a plurality of second A self-supporting diamond film cylinder 212 is placed vertically in a metallic molybdenum cup. ...

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Abstract

The invention provides a polycrystalline diamond clad sheet which comprises a hard alloy matrix and a polycrystalline diamond layer arranged on the hard alloy matrix, wherein the polycrystalline diamond layer comprises a self-supporting diamond film and mixed powder; the self-supporting diamond film comprises a first columnar self-supporting diamond film and multiple second columnar self-supporting diamond films distributed around the first columnar self-supporting diamond film; the first columnar self-supporting diamond film and the second columnar self-supporting diamond films are perpendicularly arranged on the surface of the hard alloy matrix; the area of the cross section of the first columnar self-supporting diamond film is larger than that of the cross section of each second columnar self-supporting diamond film; the mixed powder is uniformly dispersed around the first columnar self-supporting diamond film and the second columnar self-supporting diamond films; and the mixed powder comprises diamond powder and boron carbide powder. The polycrystalline diamond clad sheet provided by the invention is excellent in heat conductivity, impact resistance, film matrix binding force and wear resistance.

Description

technical field [0001] The invention belongs to the technical field of superhard composite materials, and in particular relates to a polycrystalline diamond composite sheet and a preparation method thereof. Background technique [0002] Due to the high hardness, good wear resistance and good weldability of polycrystalline diamond sheet, it has been widely used in cutting tool materials, but the thermal conductivity of polycrystalline diamond sheet prepared by traditional diamond powder is low, which reduces the Heat resistance of polycrystalline diamond chips. Moreover, during the preparation process, the cobalt element in the cemented carbide matrix will diffuse into the polycrystalline diamond layer, and the cobalt element will promote the transformation of diamond into graphite. The binding force between the cemented carbide substrate and the polycrystalline diamond layer is reduced, and the wear resistance of the polycrystalline diamond sheet is reduced. [0003] In vi...

Claims

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Application Information

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IPC IPC(8): B32B9/00B32B9/04B32B15/04
CPCB32B9/007B32B9/041B32B15/04
Inventor 唐永炳谷继腾杨扬
Owner SHENZHEN INST OF ADVANCED TECH
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