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Polycrystalline diamond cubic boron nitride composite sheet and preparation method thereof

A technology of polycrystalline diamond and cubic boron nitride, which is used in metal processing equipment, transportation and packaging, etc., can solve the problems of poor impact toughness and easy cracking.

Active Publication Date: 2021-08-20
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

Method used

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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

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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, which includes a cemented carbide substrate, a polycrystalline diamond composite layer, a polycrystalline cubic boron nitride composite layer and a hard alloy protective layer arranged sequentially from bottom to top; The polycrystalline diamond composite layer is composed of diamond micropowder and nano metal bonding agent, and the polycrystalline cubic boron nitride composite layer is composed of cubic boron nitride micropowder and metal ceramic bonding agent. The present invention also provides a method for preparing the polycrystalline diamond cubic boron nitride composite sheet, using diamond micropowder and nano-metal binder to prepare diamond bond mixture; using cubic boron nitride micropowder and cermet bond to prepare cubic nitride Boron binder mixture; put the cemented carbide substrate into the tantalum cup, pour the diamond bond mixture and the cubic boron nitride binder mixture in turn; and put the cemented carbide protective layer, and then carry out high temperature after vacuum heat treatment High pressure sintering. The composite sheet has high impact toughness and 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 Patents(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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