Polycrystalline diamond composite sheet

A polycrystalline diamond and composite sheet technology, which is used in metal layered products, drilling equipment, earth-moving drilling, etc. Improve wear resistance and impact toughness, reduce the effect of interface stress

Active Publication Date: 2013-09-25
中山市海明润超硬材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In view of the above-mentioned deficiencies in the prior art, the purpose of the present invention is to provide a polycrystalline diamond compact with a transition layer, aiming to solve the problem of using a single polycrystalline layer and a hard alloy layer in the existing polycrystalline diamond compact. existing problems

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] like figure 1 As shown, the polycrystalline diamond compact includes the following three components: a polycrystalline diamond layer 1 , a transition layer 2 , and a cemented carbide layer 3 . The composite interface between the transition layer 2 and the cemented carbide layer 3 is a plane or a concave-convex surface. For the transition layer 2, diamond particles, tungsten carbide particles and a binder are mixed, or an appropriate amount of titanium carbonitride particles is added. According to the mass ratio, select 60-70% of diamond particles with a particle size of 5-40um; 20-30% of tungsten carbide particles with a particle size of 1-10um; 5-15% of a binder with a particle size of 5-10um; Titanium carbonitride 0~10%. The thickness ratio of the transition layer 2 to the polycrystalline diamond layer 1 is 0.5-1. Laboratory tests have proved that compared with the existing polycrystalline diamond composite sheet of the same specification, the performance test of t...

Embodiment 2

[0060] like figure 2 As shown, the difference from Example 1 is that the transition layer is composed of a first transition layer 21 and a second transition layer 22, the first transition layer 21 is near the polycrystalline diamond layer 1, and the transition layer 2 is near the cemented carbide layer 3. The second transition layer 22 . The first transition layer 21 and the second transition layer 22 are composed of two layers of diamond grains, tungsten carbide grains and binders mixed with different proportions, or a small amount of titanium carbonitride grains are appropriately added. The composition of the first transition layer 21 composited with the polycrystalline diamond layer 1 is: 70-80% of diamond particles with a particle size of 5-40um; 10-20% of tungsten carbide particles with a particle size of 1-10um; a combination of Agent 5~15%; or add 0~10% of titanium carbonitride particles with a particle size of 1~5um. The composition of the second transition layer 22...

Embodiment 3

[0062] like image 3 As shown, the transition layer 2 in the polycrystalline diamond composite sheet is composed of diamond particles and a binder, wherein the polycrystalline diamond layer 1 selects diamond particles with a particle size of 5-20um; the transition layer 2 selects diamond particles with a particle size of 10-40um, and then according to Need to add the right amount of binder. The particle size of the binder in the transition layer 2 is 5-10um, and the addition ratio is 0-20%. The thickness ratio of the polycrystalline diamond layer 1 and the transition layer 2 is 0.5-1. The finer diamond particles of the polycrystalline diamond layer 1 can be selected to achieve the purpose of improving wear resistance, while the transition layer 2 selects thicker diamond particles to ensure higher impact toughness, and the polycrystalline diamond layer provides a higher impact resistance. good support. Laboratory tests show that compared with conventional and existing polycr...

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Abstract

The invention discloses a polycrystalline diamond composite sheet. In the polycrystalline diamond composite sheet provided by the invention, a polycrystalline diamond layer is not directly combined with a hard alloy layer, but a transitional layer is added between the polycrystalline diamond layer and the hard alloy layer. The transitional layer can be a single layer or formed by multiple layers, and the compositions of the transitional layer are different from one another according to different purposes. The transitional layer is added between the polycrystalline diamond layer and the hard alloy layer, so that the interface combination condition of the polycrystalline diamond composite sheet can be improved, interfacial stress can be reduced, and the abrasion resistance and the impact-resistant toughness of the polycrystalline diamond composite sheet can be synchronously improved.

Description

technical field [0001] The invention relates to the field of superhard materials, in particular to a polycrystalline diamond composite sheet with a transition layer. Background technique [0002] Polycrystalline Diamond Compacts (PDC for short) is a superhard composite material composed of a polycrystalline diamond layer and a cemented carbide layer. Because of its extremely high wear resistance of diamond polycrystalline layer and impact toughness of hard alloy, it is widely used in geological and oil drilling. Although the polycrystalline diamond layer (Polycrystalline Diamond, referred to as PCD) and cemented carbide together can combine the advantages of these two materials in a single product. But because of the inherent differences in the properties of the two materials, their interface is the most vulnerable area of ​​the product. However, the existing polycrystalline diamond compacts directly combine the polycrystalline diamond layer with the cemented carbide layer...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B10/46B32B9/04B32B15/00B32B33/00
Inventor 孔利军李尚劼
Owner 中山市海明润超硬材料有限公司
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