Polycrystalline diamond cubic boron nitride composite sheet and preparation method thereof

A polycrystalline diamond, cubic boron nitride technology, applied in metal processing equipment, transportation and packaging, etc., can solve the problems of easy cracking, poor impact toughness, etc., to achieve good wear resistance and toughness, improved impact toughness, The effect of high impact toughness

Active Publication Date: 2020-04-24
FUNIK ULTRAHARD MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the difference in thermal expansion and thermal conductivity between polycrystalline diamond and polycrystalline boron nitride, and the residual stress between the matrix material and the polycrystalline layer during synthesis, the polycrystalline diamond cubic boron nitride composite material is easy to crack during cutting. Poor impact toughness

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  • Polycrystalline diamond cubic boron nitride composite sheet and preparation method thereof
  • Polycrystalline diamond cubic boron nitride composite sheet and preparation method thereof

Examples

Experimental program
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Embodiment 1

[0026] This embodiment provides a polycrystalline diamond cubic boron nitride composite sheet, such as figure 1 As shown, it includes cemented carbide substrate 1, polycrystalline diamond composite layer 3, polycrystalline cubic boron nitride composite layer 4 and cemented carbide protective layer 2 arranged in sequence from bottom to top. Composite to form a superhard composite material.

[0027] Wherein, in this embodiment, the cemented carbide substrate is a tungsten-cobalt alloy with a cobalt content of 10%. The thickness of the hard alloy substrate is 6mm, the thickness of the hard alloy protective layer is 3mm, the thickness of the polycrystalline diamond composite layer is 0.5mm, and the thickness of the polycrystalline cubic boron nitride composite layer is 1mm .

[0028] Specifically, the polycrystalline diamond composite layer is composed of diamond micropowder and nano-metal bonding agent, and is connected to the polycrystalline cubic boron nitride composite layer...

Embodiment 2

[0040] This embodiment provides a polycrystalline diamond cubic boron nitride composite sheet, such as figure 1 As shown, it includes cemented carbide substrate 1, polycrystalline diamond composite layer 3, polycrystalline cubic boron nitride composite layer 4 and cemented carbide protective layer 2 arranged in sequence from bottom to top. Composite to form a superhard composite material.

[0041] Wherein, in this embodiment, the cemented carbide substrate is a tungsten-cobalt alloy with a cobalt content of 3%. The thickness of the cemented carbide substrate is 12mm, the thickness of the cemented carbide protective layer is 5mm, the thickness of the polycrystalline diamond composite layer is 1mm, and the thickness of the polycrystalline cubic boron nitride composite layer is 2mm.

[0042] Specifically, the polycrystalline diamond composite layer is composed of diamond micropowder and nano-metal bonding agent, and is connected to the polycrystalline cubic boron nitride composi...

Embodiment 3

[0054] This embodiment provides a polycrystalline diamond cubic boron nitride composite sheet, such as figure 1 As shown, it includes cemented carbide substrate 1, polycrystalline diamond composite layer 3, polycrystalline cubic boron nitride composite layer 4 and cemented carbide protective layer 2 arranged in sequence from bottom to top. Composite to form a superhard composite material.

[0055] Wherein, in this embodiment, the cemented carbide substrate is a tungsten-cobalt alloy with a cobalt content of 5%. The thickness of the hard alloy substrate is 8mm, the thickness of the hard alloy protective layer is 3.5mm, the thickness of the polycrystalline diamond composite layer is 0.6mm, and the thickness of the polycrystalline cubic boron nitride composite layer is 1.5mm.

[0056] Specifically, the polycrystalline diamond composite layer is composed of diamond micropowder and nano-metal bonding agent, and is connected to the polycrystalline cubic boron nitride composite lay...

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Abstract

The invention provides a polycrystalline diamond cubic boron nitride composite sheet. The polycrystalline diamond cubic boron nitride composite sheet comprises a hard alloy substrate, a polycrystalline diamond composite layer, a polycrystalline cubic boron nitride composite layer and a hard alloy protective layer which are sequentially arranged from bottom to top, wherein the polycrystalline diamond composite layer is composed of diamond micro powder and a nano metal binding agent, and the polycrystalline cubic boron nitride composite layer is composed of cubic boron nitride micro powder and ametal ceramic bonding agent. The invention further provides a method for preparing the polycrystalline diamond cubic boron nitride composite sheet. The method comprises the following steps that the diamond micro powder and the nano metal bonding agent are used for preparing a diamond bonding agent mixture; the cubic boron nitride micro powder and the metal ceramic bonding agent are used for preparing a cubic boron nitride bonding agent mixture; the hard alloy substrate is put into a tantalum cup, and the diamond bonding agent mixture and the cubic boron nitride binding agent mixture are sequentially poured into the tantalum cup; and the hard alloy protective layer is put into the tantalum cup, then vacuum heat treatment is carried out, and then high-temperature high-pressure sintering treatment is carried out. The composite sheet has high impact toughness and high strength.

Description

technical field [0001] The invention belongs to the technical field of superhard materials, and in particular relates to a polycrystalline diamond cubic boron nitride composite sheet and a preparation method thereof. Background technique [0002] At present, diamond and cubic boron nitride are the two most widely used superhard materials in the field of industrial processing. Diamond has high hardness, wear resistance and thermal conductivity. The hardness of cubic boron nitride is second only to diamond, but it has high thermal stability and is not easy to chemically react with iron. However, since both single crystal diamond and single crystal cubic boron nitride are expensive and have cleavage plane defects, many of their functional applications are still limited, so many fields in the industry choose to use more cost-effective poly Crystalline diamond or polycrystalline cubic boron nitride instead of single crystal diamond or single crystal cubic boron nitride. [0003...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C26/00C22C1/05C22F1/16B22F1/00
CPCC22C26/00C22C1/05C22F1/16C22C2026/007B22F1/10
Inventor 陈培李和鑫孔帅斐李麟
Owner FUNIK ULTRAHARD MATERIAL
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