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A kind of preparation method of arched polycrystalline diamond composite sheet

A technology of polycrystalline diamond and composite sheet, which is applied in metal material coating process, vacuum evaporation plating, coating, etc., and can solve problems such as fatigue, fracture, and easy falling off of polycrystalline diamond layer

Active Publication Date: 2021-08-20
ZHONGNAN DIAMOND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Although bonding the polycrystalline diamond layer and the cemented carbide substrate can combine the advantages of these two materials in a single product, due to the inherent differences in the properties of the two materials, their interface becomes the In the most fragile area, during the high temperature and high pressure sintering process, the physical performance parameters such as thermal expansion coefficient and elastic modulus of the polycrystalline diamond layer and the cemented carbide substrate are quite different, so there is inevitably serious thermal residual stress at the interface. As a result, the adhesion between polycrystalline diamond and cemented carbide substrate is not strong, the impact resistance is poor, and interface cracks are easily formed, resulting in the polycrystalline diamond layer being easy to fall off and break during work, resulting in failure of the drill bit
At present, the traditional flat-tooth and special-shaped diamond composite sheets (such as shallow concave PDC, conical PDC and roof-shaped PDC, etc.) on the market are weak in the application of deep complex hard rock formations, frequent tooth chipping and lower drilling. The drilling efficiency seriously affects the development of drilling technology

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  • A kind of preparation method of arched polycrystalline diamond composite sheet

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Embodiment 1

[0034] A preparation method of a circular arched polycrystalline diamond composite sheet, comprising the following steps:

[0035] Step 1) Substrate purification treatment: the cemented carbide substrate is composed of the following raw materials in weight percentage: 5% cobalt, tantalum niobium solid solution (TaC:NbC=6:4) 3%, tungsten carbide 91% and samarium oxide 1 %, the hardness of the cemented carbide is 93.5HRA, and the bending strength is 2550N / mm; first, the cemented carbide substrate is immersed in deionized water and potassium hydroxide with a mass ratio of 1:0.1 in the lye solution and boiled for 2 minutes, and then the hard alloy The alloy substrate was immersed in a sulfuric acid solution prepared with a mass fraction of 98% sulfuric acid and deionized water at a volume ratio of 1:4 for ultrasonic vibration cleaning for 2 minutes, then immersed in an acetone solution for ultrasonic vibration cleaning for 5 minutes, and then the cemented carbide substrate was plac...

Embodiment 2

[0049] A preparation method of a circular arched polycrystalline diamond composite sheet, comprising the following steps:

[0050] Step 1) Purification treatment of cemented carbide substrate: The cemented carbide substrate is composed of the following raw materials in weight percentage: 8% cobalt, 2% tantalum-niobium solid solution (TaC:NbC=6:4), 89.5% tungsten carbide and Samarium oxide 0.5%, the hardness of the cemented carbide is 94HRA, and the bending strength is 2530N / mm; first, the cemented carbide substrate is immersed in deionized water and potassium hydroxide in a lye prepared with a mass ratio of 1:0.2 and boiled for 5 minutes, and then The cemented carbide substrate was immersed in a sulfuric acid solution prepared with a mass fraction of 98% sulfuric acid and deionized water at a volume ratio of 1:5 for ultrasonic vibration cleaning for 5 min, and then immersed in absolute ethanol for ultrasonic vibration cleaning for 10 min. Then place the cemented carbide substr...

Embodiment 3

[0065] A preparation method of a circular arched polycrystalline diamond composite sheet, comprising the following steps:

[0066] Step 1) Purification treatment of cemented carbide substrate: The cemented carbide substrate is composed of the following raw materials in weight percentage: 6.5% cobalt, 2.5% tantalum niobium solid solution (TaC:NbC=6:4), 90.25% tungsten carbide and Samarium oxide 0.75%, the hardness of the cemented carbide is greater than 93.8HRA, and the bending strength is 2510N / mm; first, the cemented carbide substrate is immersed in the lye prepared by deionized water and potassium hydroxide at a mass ratio of 1:0.15 and boiled for 2.5min , and then immerse the cemented carbide substrate in a sulfuric acid solution prepared with a mass fraction of 98% sulfuric acid and deionized water at a volume ratio of 1:4.5 for ultrasonic vibration cleaning for 2.5 min, and then immersed in acetone for 7.5 min for ultrasonic vibration cleaning. Then place the cemented car...

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Abstract

The invention discloses a method for preparing a circular arch-shaped polycrystalline diamond composite sheet. The preparation method comprises: 1) purification treatment of a cemented carbide substrate; 2) deposition of a transition layer on the surface of a cemented carbide substrate; 3) ion implantation into diamond; 4 ) mixing; 5) complex assembly; 6) complex purification; 7) high temperature and high pressure sintering. The present invention uses ion beam implantation technology to implant N on the diamond surface + and B + , make up for the structural defects of the surface of ordinary diamond particles and increase the performance compatibility, improve the thermal stability and wear resistance of the polycrystalline diamond composite sheet, and at the same time use chemical vapor deposition technology to sequentially deposit silicon carbide layers and The silicon carbide-diamond gradient composite layer reduces the stress between the polycrystalline diamond layer and the cemented carbide substrate, and improves the bonding strength between the polycrystalline diamond and the cemented carbide substrate.

Description

technical field [0001] The invention belongs to the technical field of superhard materials, and in particular relates to an arched polycrystalline diamond composite sheet and a preparation method thereof. Background technique [0002] Polycrystalline diamond composite sheet is a superhard composite material composed of polycrystalline diamond layer and cemented carbide matrix. Because this product combines the advantages of both polycrystalline diamond and cemented carbide, and the polycrystalline diamond layer can always keep sharp Therefore, it is widely used in geological and oil drilling, and has achieved very good results in soft to medium hard rock formations. [0003] Although bonding the polycrystalline diamond layer and the cemented carbide substrate can combine the advantages of these two materials in a single product, due to the inherent differences in the properties of the two materials, their interface becomes the In the most fragile area, during the high tempe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C16/32C23C16/30C23C14/48B22F7/08B22F3/14B22F5/00C22C49/00C22C101/04C22C101/02C22C101/14C22C101/20
CPCB22F3/14B22F5/00B22F7/08B22F2005/001C22C49/00C23C14/223C23C14/48C23C16/30C23C16/325
Inventor 张涛卢灿华宋子衡朱培邱林
Owner ZHONGNAN DIAMOND CO LTD