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Polycrystalline diamond compact with functional gradient structure and preparation method of polycrystalline diamond compact

A technology of polycrystalline diamond and functional gradient, applied in metal processing equipment, additive manufacturing, earthwork drilling and mining, etc., to achieve the effects of relieving residual thermal stress, improving production efficiency, and changing the state of stress distribution

Active Publication Date: 2022-05-20
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, there is no report on the preparation of functionally graded polycrystalline diamond composite sheets by 3D printing in the prior art.

Method used

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  • Polycrystalline diamond compact with functional gradient structure and preparation method of polycrystalline diamond compact
  • Polycrystalline diamond compact with functional gradient structure and preparation method of polycrystalline diamond compact
  • Polycrystalline diamond compact with functional gradient structure and preparation method of polycrystalline diamond compact

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Experimental program
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Effect test

Embodiment 1

[0032] Such as figure 1 As shown, the polycrystalline diamond compact with functionally graded structure includes three parts: a polycrystalline diamond layer, an n-layer PCD / tungsten carbide composite gradient layer, and a cemented carbide substrate. The diameter × height of the polycrystalline diamond composite sheet of the design model 1913 is 19.05mm × 13.20mm. The volume fraction of diamond in the polycrystalline diamond layer is 100%. In the cemented carbide matrix layer, WC-13wt%Co is used (YG13) alloy powder, its composition ratio is WC87%, Co13%, set 4 intermediate gradient layers, the volume content of YG13 in each gradient layer is 15%, 35%, 55%, 75%, and the corresponding gradient layers The volume content of diamond in the medium is 85%, 65%, 45%, and 25%, respectively. The particle size of the pre-alloyed powder is 0.038-0.044 mm, and the particle size of the diamond powder is 0.12-0.15 mm.

[0033] Its production process is as follows:

[0034] (1) Select an ap...

Embodiment 2

[0040] Such as figure 1 As shown, the functionally graded polycrystalline diamond compact structure includes three parts: a polycrystalline diamond layer, an n-layer PCD / tungsten carbide composite gradient layer, and a cemented carbide substrate. The diameter × height of the polycrystalline diamond composite sheet of the design model 1613 is 15.88mm × 13.20mm. The volume fraction of diamond in the polycrystalline diamond layer is 100%. In the cemented carbide matrix layer, WC-15wt%Co is used (YG15) alloy powder, its composition ratio is WC85%, Co15%, set 5 intermediate gradient layers, the volume content of YG15 in each gradient layer is 15%, 25%, 35%, 55%, 75%, corresponding The volume content of diamond in each gradient layer is 85%, 75%, 65%, 45%, and 25%, respectively. The particle size of the pre-alloyed powder is 0.061-0.074 mm, and the particle size of the diamond powder is 0.250-0.297 mm.

[0041] Its production process is as follows:

[0042] (1) Select an appropri...

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Abstract

According to the polycrystalline diamond compact of the functional gradient structure and the preparation method of the polycrystalline diamond compact, the polycrystalline diamond compact is divided into a hard alloy matrix, a PCD / hard alloy composite gradient layer and a polycrystalline diamond layer from bottom to top, in the PCD / hard alloy composite gradient layer, the PCD content is gradually increased from bottom to top, and the PCD content is gradually increased from bottom to top. And the content of the hard alloy is gradually reduced from bottom to top. According to the method, the slurry direct-writing 3D printing method is adopted for manufacturing the functionally gradient structure polycrystalline diamond compact, the polycrystalline diamond compact has a middle transition layer, the situation of poor adhesion between diamond and hard alloy is relieved, and the bonding strength between interfaces is improved. By adopting the slurry direct-writing 3D printing preparation method, flow line production of the functionally gradient structure polycrystalline diamond compact can be realized, and the production efficiency is improved; and the number of gradient layers and the powder mass ratio can be adjusted according to actual production, and personalized production of the functionally gradient structure polycrystalline diamond compact is completed.

Description

technical field [0001] The invention belongs to the technical field of polycrystalline diamond composite sheet preparation, and in particular relates to a polycrystalline diamond composite sheet with a functional gradient structure and a preparation method thereof. Background technique [0002] Polycrystalline diamond compact is an ideal material for making cutting tools, drilling bits and other wear-resistant tools. It not only has the high hardness, high wear resistance and thermal conductivity of diamond, but also has the strength and impact resistance toughness of cemented carbide. At present, the method of preparing polycrystalline diamond compact is mainly through the catalytic sintering method, that is, the cobalt in the cemented carbide matrix is ​​melted at high temperature, and then diffused from the matrix to the entire diamond powder layer under high pressure to melt part of the diamond, and then make it The molten diamond re-precipitates to form D-D bonds. Howe...

Claims

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Application Information

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IPC IPC(8): B22F5/00B22F3/14B22F10/16B22F1/10B22F10/85B22F10/64B22F10/66B33Y10/00B33Y70/10B33Y50/02B33Y80/00C22C26/00C22C29/08B22F10/38E21B10/46
CPCB22F5/00B22F3/14B22F10/16B22F10/85B22F10/64B22F10/66B33Y10/00B33Y70/10B33Y50/02B33Y80/00C22C26/00C22C29/08C22C29/067B22F10/38E21B10/46B22F2005/001B22F2998/00B22F2207/01Y02P10/25
Inventor 张绍和王娅妮何焘孔祥旺苏舟吴晶晶吴冬宇刘磊磊
Owner CENT SOUTH UNIV
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