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Sandwich-type polycrystalline diamond compact and preparation method thereof and used binding agent

A diamond polycrystalline and diamond polycrystalline layer technology, which is applied in the field of diamond and hard alloy composite tool materials, non-ferrous metals and difficult-to-machine non-metallic materials, can solve the problem of diamond polycrystalline layer chipping and reduce the composite sheet Problems such as service life, diamond polycrystalline layer damage, etc., to achieve the effect of not easy chipping, improved stress condition, and good sintering promotion effect

Active Publication Date: 2015-10-07
ZHONGNAN DIAMOND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the actual application process, when the drill bit made of this kind of composite sheet is drilled, due to various impact forces, the diamond polycrystalline layer is often prone to chipping, which greatly reduces the service life of the composite sheet, and even causes diamond damage. The polycrystalline layer was severely damaged, so that it was scrapped

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A sandwich-type polycrystalline diamond composite sheet sequentially includes an upper layer of hard alloy substrate, a middle layer of diamond polycrystalline layer and a lower layer of hard alloy substrate, and the three are composited through high-temperature and high-pressure sintering.

[0023] A nano-metal bond that makes the sandwich-type diamond polycrystalline composite sheet have high impact toughness and good wear resistance. It is composed of the following raw materials in weight percentage: Co powder 97%, Ni powder 1.8% , TaC powder 0.7%, B powder 0.5%. The raw materials of the binder are preferably analytically pure, the particle size of TaC powder and B powder is 20-30nm, and the particle size of Ni powder and Co powder is 30-40nm, which is beneficial to enhance the impact toughness, Wear resistance and heat resistance.

[0024] The diamond polycrystalline layer of the sandwich diamond polycrystalline composite sheet is composed of the following raw mate...

Embodiment 2

[0033] The difference between this example and Example 1 is that the nano-metal bonding agent is composed of the following raw materials in percentage by weight: Co powder 99%, Ni powder 0.78%, TaC powder 0.2%, B powder 0.02% .

[0034] The diamond polycrystalline layer is composed of the following raw materials in weight percentage: 96% of diamond powder with a particle size of 2-10 μm and 4% of the above-mentioned nano-metal bond.

[0035] The cemented carbide matrix is ​​composed of the following raw materials in weight percentage: 91% of WC powder, 0.5% of NbC powder and 8.5% of Co powder.

[0036] Its preparation method comprises the following steps:

[0037] 1) Purification and reduction treatment: Boil the diamond powder with 30% sodium hydroxide aqueous solution for 40 minutes, wash it with deionized water until neutral, boil it with a mixed acid solution of sulfuric acid and nitric acid with a volume ratio of 1:1 for 30 minutes, and wash it with deionized water Wash...

Embodiment 3

[0043] The difference between this example and Example 1 is that the nano-metal bond is composed of the following raw materials in weight percentage: Co powder 98%, Ni powder 1%, TaC powder 0.6%, B powder 0.4% .

[0044] The diamond polycrystalline layer is composed of the following raw materials in weight percentage: 95% of diamond powder and 5% of the above-mentioned nano-metal bond.

[0045] The cemented carbide matrix is ​​composed of the following raw materials in weight percentage: 90% of WC powder, 1% of NbC powder and 9% of Co powder.

[0046] Its preparation method comprises the following steps:

[0047] 1) Purification and reduction treatment: Boil the diamond powder with 25% sodium hydroxide aqueous solution for 35 minutes, wash it with deionized water until neutral, boil it with a mixed acid solution of sulfuric acid and nitric acid with a volume ratio of 1:1 for 25 minutes, and wash it with deionized water Wash with water until neutral, then boil with a mixed so...

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Abstract

The invention discloses a sandwich-type polycrystalline diamond compact and a preparation method thereof and a used binding agent. The binging agent is made through matching of Co powders, Ni powders, TaC powders and B powders according to a certain proportion. The sandwich-type polycrystalline diamond compact comprises two layers of cemented carbide matrixes and a polycrystalline diamond layer arranged between the two layers of cemented carbide matrixes. The polycrystalline diamond layer and diamond powders are matched in a certain proportion through the binding agent, the polycrystalline diamond layer and the substrate are composited with each other through high-temperature high-pressure sintering, and a superhard composite material with three layers of materials is formed. The cemented carbide layers play the role of a protecting layer, the stress state of the compact when the polycrystalline diamond layer is drilled in is improved, and tipping is avoided. The nanocrystalline metal binding agent can facilitate sintering in high temperature and high pressure, so that the boding density between the diamond (D-D bond) is improved, a good sintering promoting function is achieved, forming of a tough sintering body is facilitated, the impact toughness, the wear-resisting performance and the heat-resisting performance of the sandwich-type polycrystalline diamond compact are increased, and the technological difficulty of high-wearing feature and high impact toughness of the polycrystalline compact is overcome.

Description

technical field [0001] The invention belongs to the field of diamond and cemented carbide composite tool materials, and in particular relates to a sandwich diamond polycrystalline composite sheet, a preparation method thereof and a binder used, which can be used for cutting non-ferrous metals and difficult-to-machine non-metallic materials field. Background technique [0002] Diamond polycrystalline composite sheet is a composite material composed of diamond and cemented carbide. Because it has the characteristics of high diamond hardness and good wear resistance, it also has the characteristics of strong impact resistance and good weldability of cemented carbide. Therefore, it is widely used in industries such as oil drilling, geological exploration, drill bits and machining tools for coal drilling. The traditional polycrystalline diamond composite sheet generally consists of two layers, one is a cemented carbide substrate, and the other is a polycrystalline diamond layer ...

Claims

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Application Information

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IPC IPC(8): B22F7/04
Inventor 卢灿华张涛刘俊涛窦明
Owner ZHONGNAN DIAMOND CO LTD
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