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A double-sided heat-resistant polycrystalline diamond composite sheet and its preparation process

The invention relates to a polycrystalline diamond and a preparation process technology, which is applied to the field of double-sided heat-resistant polycrystalline diamond composite sheets and their preparation technology, which can solve the problem of low heat resistance of ordinary polycrystalline diamond composite sheets, and achieve high hardness, strong toughness, The effect of enhancing the binding force

Active Publication Date: 2020-08-11
ZHONGNAN DIAMOND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to propose a preparation process of a double-sided heat-resistant polycrystalline diamond composite sheet. One is to solve the problem that the cutting tool made of a single-layer polycrystalline diamond composite sheet has only one-sided cutting performance. Titanium plating treatment is used to make up for the lack of heat resistance of ordinary polycrystalline diamond, and to solve the problem of low heat resistance of ordinary polycrystalline diamond composite sheets, so as to achieve the purpose of improving the service life and performance of tools

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] A preparation process for a double-sided heat-resistant polycrystalline diamond composite sheet, comprising the following steps:

[0037] 1) Cobalt removal on the surface of the cemented carbide substrate: wrap the polytetrafluoroethylene protective material on the side of the cemented carbide substrate, and then place it on the HNO 3 :H 2 Etch in a solution with a volume ratio of O of 1:2.5 for 30 min, take out the cemented carbide substrate and wash it with ion water to neutrality to obtain a cemented carbide substrate with decobalt on the upper and lower surfaces, and the thickness of the decobalt layer on the upper and lower surfaces Both are 100 μm, and the cobalt content of the decobaltized layer is 1.2% (weight percent);

[0038] The cemented carbide substrate is composed of 90% WC powder, 9% Co powder and 1% Ce powder composed of the following raw materials by weight percentage. The particle size of the WC powder is 0.8µm, and the specification of the cemented ...

Embodiment 2

[0053] A preparation process for a double-sided heat-resistant polycrystalline diamond composite sheet, comprising the following steps:

[0054] 1) Cobalt removal on the surface of the cemented carbide substrate: wrap the polytetrafluoroethylene protective material on the side of the cemented carbide substrate, and then place it on the HNO 3 :H 2 O volume ratio is 110min in the solution of 1: 3, takes out cemented carbide substrate and rinses to neutrality with ion water, obtains the cemented carbide substrate of upper and lower surface cobalt removal, the thickness of the decobalt layer of upper and lower surface is equal to 200 μm, the cobalt content on the surface of the decobaltized layer is 1.5% (weight percent);

[0055] The cemented carbide substrate is composed of 92.5% WC powder, 7% Co powder and 0.5% Ce powder composed of the following weight percentages. The particle size of the WC powder is 1.2µm, and the specification of the cemented carbide substrate is φ45mm×2....

Embodiment 3

[0070] 1) Cobalt removal on the surface of the cemented carbide substrate: wrap the polytetrafluoroethylene protective material on the side of the cemented carbide substrate, and then place it on the HNO 3 :H 2 Etch in a solution with O volume ratio of 1:2.75 for 70 min, take out the cemented carbide substrate and rinse it with ionized water until neutral to obtain a cemented carbide substrate with decobalt on the upper and lower surfaces, and the thickness of the decobalt layer on the upper and lower surfaces Both are 150 μm, and the cobalt content on the surface of the decobaltized layer is 1.4% (weight percent);

[0071] The cemented carbide substrate is composed of the following raw materials in weight percentage: 91.25% WC powder, 8% Co powder and 0.75% Ce powder. The particle size of the WC powder is 1µm, and the specification is φ45mm×2.0mm.

[0072] 2) Titanium coating on the surface of diamond micropowder: TiO 2 , MgO, NaCl and Al are mixed in a mass ratio of 40:23....

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Abstract

The invention discloses a double-sided heat-resistant polycrystalline diamond composite sheet and its preparation process. The preparation process includes: 1) decobalt on the surface of a hard alloy substrate; 2) titanium plating on the surface of diamond micropowder; 3) purification of titanium-coated diamond micropowder ; 4) Preparation of polycrystalline diamond layer powder mixture; 5) Preparation of composite components; 6) Preparation of composite sheets. The double-sided heat-resistant polycrystalline diamond composite sheet prepared by the present invention meets the high-precision and high-efficiency processing requirements of the superhard composite tool used in the cutting and milling process, and solves the heat resistance of ordinary polycrystalline diamond composite sheet The problem is not high, thereby improving the service life and performance of the tool.

Description

technical field [0001] The invention belongs to the technical field of superhard materials, and in particular relates to a double-sided heat-resistant polycrystalline diamond composite sheet and a preparation process thereof. Background technique [0002] Polycrystalline diamond composite sheet is a kind of superhard composite material sintered under high temperature and high pressure conditions with diamond micropowder and cemented carbide matrix as the substrate. Because it has the characteristics of high diamond hardness and good wear resistance, it is also It has the characteristics of strong impact resistance and good weldability of cemented carbide, so it is widely used in the field of machining tools. The traditional polycrystalline diamond composite sheet is generally composed of upper and lower layers of materials, the lower layer is a cemented carbide substrate, and the upper layer is a polycrystalline diamond layer attached to the substrate. The above-mentioned si...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23F1/28C23C14/18B22F1/02B22F1/00B22F9/04B22F3/10B22F3/14B22F7/04B22F5/00C22C29/16C22C26/00C22C29/08
CPCC22C26/00C23C14/18C23F1/28B22F3/001B22F3/101B22F3/14B22F5/00B22F7/04B22F9/04B22F2005/001B22F2009/043B22F1/105B22F1/142B22F1/17C23F1/02
Inventor 张涛卢灿华窦明刘俊涛
Owner ZHONGNAN DIAMOND CO LTD
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