Circular-arch-shaped polycrystalline diamond composite sheet preparing method

A technology of polycrystalline diamond and composite sheet, which is applied in metal material coating technology, ion implantation plating, gaseous chemical plating, etc., can solve the problems of low drilling efficiency, poor impact resistance, interface cracks, etc., and achieve improvement The effect of excessive residual stress, enhanced bonding strength, and improved thermal stability

Active Publication Date: 2019-12-17
ZHONGNAN DIAMOND CO LTD
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  • Abstract
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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 adhes

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  • Circular-arch-shaped polycrystalline diamond composite sheet preparing method

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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 10 min for ultrasonic vibration cleaning. 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 circular-arch-shaped polycrystalline diamond composite sheet preparing method. The circular-arch-shaped polycrystalline diamond composite sheet preparing method comprises thesteps that firstly, hard alloy base body purification treatment is conducted; secondly, a transition layer is deposited on the surface of a hard alloy base body; thirdly, ion implantation of diamondis conducted; fourthly, material mixing is conducted; fifthly, composite body assembling is conducted; sixthly, composite body purification is conducted; and seventhly, high-temperature high-pressuresintering is conducted. N<+> and B<+> are injected into the surface of the diamond through the ion beam injection technology, structure defects existing in the ordinary diamond particle surface are overcome, performance compatibility is improved, and heat stability and abrasion resisting performance of a polycrystalline diamond composite sheet are improved. Meanwhile, the chemical vapor depositiontechnology is utilized for sequentially depositing a silicon carbide layer and a silicon carbide-diamond gradient composite layer on the hard alloy surface, stress between the polycrystalline diamondlayer and the hard alloy base body is reduced, and the bonding strength of the polycrystalline diamond layer and the hard alloy base body is improved.

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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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
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