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A polycrystalline diamond composite button for down-the-hole drilling and its preparation method

A polycrystalline diamond and composite ball technology, which is applied in drilling equipment, metal processing equipment, drill bits, etc., can solve the problem of large residual stress in the cemented carbide layer and the polycrystalline diamond layer, achieve a good sintering promotion effect, reduce micro Cracks, the effect of prolonging the service life

Active Publication Date: 2019-05-14
ZHONGNAN DIAMOND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a polycrystalline diamond composite button for down-the-hole drilling and its preparation method, which mainly solves the problem of relatively large residual stress between the cemented carbide layer and the polycrystalline diamond layer after sintering of the existing cemented carbide button

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  • A polycrystalline diamond composite button for down-the-hole drilling and its preparation method

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Experimental program
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Effect test

Embodiment 1

[0033] Such as figure 1 As shown, a polycrystalline diamond composite button for down-the-hole drilling includes a cemented carbide button 1 and a composite layer arranged on the cemented carbide button 1, and the composite layer includes sequentially arranged from the inside to the outside. The first transition layer 2 , the second transition layer 3 , the third transition layer 4 and the polycrystalline diamond layer 5 . The composition of the composite layer is: 60wt% polycrystalline diamond layer, 14wt% third transition layer, 13wt% second transition layer and 13wt% first transition layer. The raw material composition of the cemented carbide button 1 is: WC powder 84.5wt%, Co powder 14wt%, TiCN powder 1.5wt%, the particle size of the WC powder is 1.6-2.2µm, the particle size of the Co powder and TiCN powder The diameter is 0.8 ~ 1.2 µm. The raw material composition of the first transition layer 2 is: boron-containing diamond powder 20wt%, cubic boron nitride powder 8 wt%...

Embodiment 2

[0042] Such as figure 1 As shown, a polycrystalline diamond composite button for down-the-hole drilling includes a cemented carbide button 1 and a composite layer arranged on the cemented carbide button 1, and the composite layer includes sequentially arranged from the inside to the outside. The first transition layer 2 , the second transition layer 3 , the third transition layer 4 and the polycrystalline diamond layer 5 . The composition of the composite layer is: polycrystalline diamond layer 66wt%, third transition layer 12wt%, second transition layer 11wt%, and first transition layer 11wt%. The raw material composition of the cemented carbide button 1 is: WC powder 85.5wt%, Co powder 13.5wt%, TiCN powder 1wt%, the particle size of the WC powder is 1.6-2.2µm, the particle size of the Co powder and TiCN powder The diameter is 0.8 ~ 1.2 µm. The raw material composition of the first transition layer 2 is: boron-containing diamond powder 35wt%, cubic boron nitride powder 5 wt...

Embodiment 3

[0051] Such as figure 1As shown, a polycrystalline diamond composite button for down-the-hole drilling includes a cemented carbide button 1 and a composite layer arranged on the cemented carbide button 1, and the composite layer includes sequentially arranged from the inside to the outside. The first transition layer 2 , the second transition layer 3 , the third transition layer 4 and the polycrystalline diamond layer 5 . The composition of the composite layer is: 63wt% polycrystalline diamond layer, 13wt% third transition layer, 12wt% second transition layer and 12wt% first transition layer. The raw material composition of the cemented carbide button 1 is: WC powder 85wt%, Co powder 13.75wt%, TiCN powder 1.25wt%, the particle size of the WC powder is 1.6-2.2µm, the particle size of the Co powder and TiCN powder The diameter is 0.8 ~ 1.2 µm. The raw material composition of the first transition layer 2 is: boron-containing diamond powder 27.5wt%, cubic boron nitride powder 6....

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Abstract

The invention belongs to the technical field of drilling tools, and specifically relates to a polycrystalline diamond composite button for down-the-hole drilling and a preparation method thereof. The polycrystalline diamond composite button for down-the-hole drilling includes cemented carbide buttons and A composite layer on an alloy button, the composite layer includes a first transition layer, a second transition layer, a third transition layer and a polycrystalline diamond layer arranged in sequence from inside to outside. It mainly solves the problem of large residual stress between the cemented carbide layer and the polycrystalline diamond layer after sintering of the existing cemented carbide ball teeth, and has high strength, high hardness, high wear resistance, long service life and good impact resistance The performance parameters of the prepared polycrystalline diamond composite button for down-the-hole drilling are: wear ratio of 320,000 to 360,000, impact toughness of 950 to 1,000 joules; thermal stability: after roasting at 750°C for 15 minutes, the wear ratio of the product is 30 ~340,000, impact toughness 900~950 joules, service life 10~15 times that of cemented carbide buttons.

Description

technical field [0001] The invention belongs to the technical field of drilling tools, and in particular relates to a polycrystalline diamond composite button for down-the-hole drilling and a preparation method thereof. Background technique [0002] At present, the domestically produced down-the-hole drill bits all use cemented carbide buttons, which are widely used in down-the-hole drilling because of their high impact resistance and good hardness. When entering the hard abrasive rock formation, due to the extremely harsh underground working environment, the drill button not only bears the high impact force with the granite, but also bears the friction with the granite, as well as the friction of the bit end face flushing medium on the button , Therefore, the cemented carbide button wears out quickly due to insufficient wear resistance, causing the drill bit to be scrapped. Compared with cemented carbide buttons, polycrystalline diamond composite buttons have excellent mec...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F7/06B22F1/00C22C29/02C22C26/00E21B10/46
CPCE21B10/46C22C26/00C22C29/005C22C29/02B22F7/06B22F2998/10B22F1/10B22F2003/248B22F3/14B22F3/101B22F3/04
Inventor 张涛卢灿华刘俊涛窦明
Owner ZHONGNAN DIAMOND CO LTD