Sandwich type diamond polycrystalline composite sheet and its preparation method and used binder

A technology of polycrystalline diamond and polycrystalline diamond layer, which is applied in the cutting of non-ferrous metals and difficult-to-machine non-metallic materials, and in the field of diamond and hard alloy composite tool materials, can solve the problem of reducing the service life of composite sheets and the damage of polycrystalline diamond layers. damage, easy chipping of the diamond polycrystalline layer, etc., to achieve the effect of improving the stress condition, good sintering promotion, and not easy to chip

Active Publication Date: 2017-09-29
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 composite sheet, a preparation method thereof and a binder used. The binder is made of Co powder, Ni powder, TaC powder and B powder in a certain proportion. The composite sheet It consists of two layers of hard alloy substrates and a diamond polycrystalline layer in the middle. The diamond polycrystalline layer uses the above-mentioned binder and diamond powder in a certain ratio, and then composites with the substrate through high-temperature and high-pressure sintering to form a three-layer superhard material. composite material. The cemented carbide layer acts as a protective layer, which greatly improves the force condition of the composite diamond polycrystalline layer when drilling, and avoids chipping. The nano-metal bond helps sintering under high temperature and high pressure to increase the bonding density between diamonds (D-D bonds), has a good sintering promotion effect, and is conducive to the formation of a strong and tough sintered body, increasing the sandwich diamond The impact toughness, wear resistance and heat resistance of the polycrystalline composite sheet have broken through the technical bottleneck of high wear resistance and high impact toughness of the diamond composite sheet.

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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Patent Type & Authority Patents(China)
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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