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Preparation method of high-toughness polycrystalline cubic boron nitride compound sheets

A technology of polycrystalline cubes and composite sheets, which is applied in the field of preparation of superhard composite cutting tools, can solve the problems of large chemical composition differences between the cemented carbide matrix and the polycrystalline layer, different thermal expansion coefficients, and easy cracking of the composite sheet, so as to avoid Chipping phenomenon, good fracture toughness, good workability

Inactive Publication Date: 2012-06-20
ZHONGYUAN ENGINEERING COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

(3) High chemical inertness
However, the chemical composition of the cemented carbide substrate and the polycrystalline layer are greatly different, and the thermal expansion coefficients are different. The composite sheet is easy to crack and delaminate, which is greatly restricted in use.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The matrix for preparing the composite sheet is tungsten-cobalt cemented carbide. Select polycrystalline cubic boron nitride polycrystalline layer raw material micropowder, cubic boron nitride micropowder accounts for the mass fraction ratio of raw material micropowder is 70%, three kinds of cubic boron nitride micropowders with different particle sizes change respectively in cubic boron nitride micropowder The mass fraction ratio is: 42% in the range of 1 micron to 4 microns, 45% in the range of 7 microns to 10 microns, and 13% in the range of 12 microns to 15 microns. The mass fraction ratio of tungsten-cobalt cemented carbide powder to the raw material powder is 16%, the mass fraction ratio of zirconia whiskers to the raw material powder is 0.8%, and the mass fraction ratio of the binder metal cobalt powder and titanium nitride to the raw material powder respectively It is 7.2% and 6%. Zirconia whiskers are 80 nanometers in diameter and 5 microns in length. The abo...

Embodiment 2

[0031] The matrix for preparing the composite sheet is tungsten-cobalt cemented carbide. Select polycrystalline cubic boron nitride polycrystalline layer raw material micropowder, cubic boron nitride micropowder accounts for the mass fraction ratio of raw material micropowder is 60%, three kinds of cubic boron nitride micropowders with different particle sizes change respectively in cubic boron nitride micropowder The mass fraction ratio is: 40% in the range of 1 micron to 4 microns, 50% in the range of 7 microns to 10 microns, and 10% in the range of 12 microns to 15 microns. The mass fraction ratio of tungsten-cobalt cemented carbide micropowder to raw material micropowder is 18.5%, the mass fraction ratio of alumina whisker to raw material micropowder is 0.5%, and the mass fraction ratio of binder metal cobalt powder is 20%. Zirconia whiskers are 80 nanometers in diameter and 5 microns in length. The above-mentioned raw material micropowder and matrix are respectively subj...

Embodiment 3

[0036] The matrix for preparing the composite sheet is tungsten-cobalt cemented carbide. Select polycrystalline cubic boron nitride polycrystalline layer raw material micropowder, cubic boron nitride micropowder accounts for the mass fraction ratio of raw material micropowder is 85%, three kinds of cubic boron nitride micropowders with different particle size changes respectively in cubic boron nitride micropowder The mass fraction ratio is: 50% in the range of 1 micron to 4 microns, 30% in the range of 7 microns to 10 microns, and 20% in the range of 12 microns to 15 microns. The mass fraction ratio of tungsten-cobalt cemented carbide powder to the raw material powder is 13%, the mass fraction ratio of silicon carbide whiskers to the raw material powder is 1%, and the mass fraction ratio of the binder metal nickel powder and aluminum nitride to the raw material powder is respectively It is 3% and 2%. Zirconia whiskers are 80 nanometers in diameter and 5 microns in length. T...

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Abstract

The invention relates to a preparation method of high-toughness polycrystalline cubic boron nitride compound sheets. The preparation method comprises the following steps that: various raw materials are respectively subjected to chemical acid-base treatment and physical vacuum treatment; micro powder of the treated raw materials is respectively mixed according to different mass percent ratios, mixed materials and base body material hard alloy base body sheets are pressed into test blocks according to a certain layer paving sequence; pressed and formed test blocks are put into a molybdenum cup separated by a salt tube shielding layer, then, filled salt tubes are put into a graphite mold, finally, the graphite mold is filled into a pyrophyllite cavity, ends are sealed, and synthesis blocks are obtained through assembling; and the synthesis blocks are sintered together at ultra-high pressure and high temperature to form the polycrystalline hard alloy compound sheets. The preparation method has the advantages that the toughness characteristic of the base body materials is fully utilized, the similar compatibility of the base body materials and polycrystalline layers of the prepared polycrystalline cubic boron nitride compound sheets is good, the fracture toughness property is good, the anti-impact performance is high, the knife breaking phenomenon can be greatly avoided, the knife change times are reduced, the service life is prolonged, and the processing efficiency and the processing precision of a knife tool are improved.

Description

technical field [0001] The invention relates to the technical field of preparation of superhard composite cutting tools for cutting and milling, in particular to a preparation method of a high-toughness polycrystalline cubic boron nitride composite sheet. Background technique [0002] Diamond is the hardest material known in the world. Cubic boron nitride has a diamond-like structure, and its hardness is second only to diamond. Diamond and cubic boron nitride are collectively called superhard materials. Superhard materials are widely used in sawing tools, grinding tools, drilling tools and cutting tools. Diamond is easy to oxidize at high temperature, especially has a good affinity with iron elements, so it is not suitable for ferrous metal processing. [0003] The thermal stability of cubic boron nitride is better than that of artificial diamond, and it can still maintain high enough mechanical properties and hardness at high temperatures, and has good red hardness; cubic b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C29/00C22C1/05B22F3/14
Inventor 王艳芝张旺玺蔡森刘磊
Owner ZHONGYUAN ENGINEERING COLLEGE
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