Diamond-cubic boron nitride type universal superhard cutter material, cutter and preparation method of material

A technology of cubic boron nitride and tool materials, applied in chemical instruments and methods, methods of chemically changing substances by using atmospheric pressure, chemical/physical processes, etc., can solve the problem of high-speed cutting of iron group metals and poor thermal stability and other problems, to achieve the effect of eliminating insufficient high temperature stability, high thermal stability, and uniform grains

Inactive Publication Date: 2015-07-08
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] As typical superhard materials, diamond and cubic boron nitride are widely used in industry, but both have natural shortcomings: in terms of inherent performance, diamond has the highest hardness, but its thermal stability is poor, so it cannot be applied to iron group metals. High-speed cutting; cubic boron nitride has high thermal stability, but its hardness is only about half that of diamond
[0004] Preparation of large-size (diameter greater than 2.5mm) diamond-cubic boron nitride superhard alloy with domestic hinged six-sided top press under ultra-high pressure and high temperature, which can be processed into turning tools and tested for its turning performance on hardened steel and granite Reports haven't appeared yet

Method used

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  • Diamond-cubic boron nitride type universal superhard cutter material, cutter and preparation method of material
  • Diamond-cubic boron nitride type universal superhard cutter material, cutter and preparation method of material
  • Diamond-cubic boron nitride type universal superhard cutter material, cutter and preparation method of material

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] (1) material preparation

[0038] The crystal grains are diamond with an average particle size of 2 μm and cubic boron nitride crystallites with an average particle size of 2 μm, forming a steel alloy substrate.

[0039] (2) Raw material processing and molding

[0040] Mix 5 parts of diamond micropowder and 5 parts of cubic boron nitride micropowder by weight, first treat with 5 parts of surface treatment agent sulfuric acid, dissolve the impurities in the initial material at room temperature, wash with deionized water until neutral, and then Drying; wet mixing with 10 parts of alcohol, and then mixing under ultrasonic vibration with a power of 20W, in a vacuum of 4x10 -3Pa, the temperature is 1000°C, treated for 1 hour, and pre-pressed for 5 minutes at room temperature and pressure of 10 MPa without adding any binder.

[0041] (3) High pressure sintering

[0042] Put the sintering unit of the pre-pressed blank in step (2) into a high-pressure device, sinter and stre...

Embodiment 2

[0046] (1) material preparation

[0047] Diamond with an average particle size of 0.5 μm and cubic boron nitride crystallites with an average particle size of 0.5 μm form a cemented carbide substrate.

[0048] (2) Raw material processing and molding

[0049] Mix 4 parts of diamond micropowder and 6 parts of cubic boron nitride micropowder by weight, first treat with 5 parts of surface treatment agent hydrochloric acid, dissolve the impurities in the initial material at room temperature, wash with deionized water until neutral, and dry Dry; wet mix with 16 parts of alcohol, and then mix under ultrasonic vibration with a power of 20W, in a vacuum of 4x10 -3 Pa, the temperature is 1000°C, treated for 2 hours, and pre-pressed for 5 minutes at room temperature and a pressure of 10 MPa without adding any binder.

[0050] (3) High pressure sintering

[0051] Put the sintering unit assembled with the pre-pressed blank in step (2) into a high-pressure device, sinter and strengthen a...

Embodiment 3

[0055] (1) material preparation

[0056] Diamond with an average particle size of 8 μm and cubic boron nitride crystallites with an average particle size of 0.5 μm form a cemented carbide substrate.

[0057] (2) Raw material processing and molding

[0058] Mix 9 parts of diamond micropowder and 1 part of cubic boron nitride micropowder by weight, first treat with 5 parts of surface treatment agent hydrofluoric acid, dissolve impurities in the initial material at a temperature of 100°C, and wash with deionized water to medium properties, drying; wet mixing with 16 parts of alcohol, and then mixing with a power of 20W ultrasonic vibration, in a vacuum of 4x10 -3 Pa, the temperature is 1200°C, treated for 1 hour, and pre-pressed for 5 minutes at room temperature and pressure of 10 MPa without adding any binder.

[0059] (3) High pressure sintering

[0060] Put the sintering unit assembled with the pre-pressed blank in step (2) into a high-pressure device, sinter and strengthen...

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Abstract

The invention discloses a diamond-cubic boron nitride type universal superhard cutter material, a cutter and a preparation method of the material. The material is characterized in that diamond and cubic boron nitride are used as raw materials, the pre-treatment and the forming are performed on the raw materials to obtain a blank; the blank assembled with a sintering unit is arranged in a high temperature and high pressure device, wherein the intensity of pressure is 7-25GPa, the temperature is 1000-2700 DEG C, the sintering solution strengthening lasts for 10s-30min, the sizes of obtained crystal grains are uniform, and interfaces of the crystal grains are tight and closed; the compact-structure diamond-cubic boron nitride type universal superhard cutter material which is high in atomic density, is in a three-dimensional network shape and has strong covalent bonds can be formed by boron atoms, carbon atoms and nitrogen atoms at the crystal interfaces between the diamond and the cubic boron nitride. The universal superhard material is processed into a cylinder with the same height; two ends of the cylinder are polished and finished and then are processed to be in triangular cylinder shapes with the side lengths and the thicknesses of 2-3mm, the processed cylinder and a steel alloy base body are welded under the vacuum degree being 1*10<-3>Pa at the temperature being 800 DEG C, and then the laser processing is performed, so that the superhard alloy cutter in which the radius of the circular arc of the knife point is 0.4-0.8mm is obtained.

Description

technical field [0001] The invention relates to a diamond-cubic boron nitride universal superhard tool material, a tool and a preparation method thereof, belonging to the field of superhard material preparation and application. technical background [0002] As typical superhard materials, diamond and cubic boron nitride are widely used in industry, but both have natural shortcomings: in terms of inherent performance, diamond has the highest hardness, but its thermal stability is poor, so it cannot be applied to iron group metals. High-speed cutting; cubic boron nitride has high thermal stability, but its hardness is only about half that of diamond. Diamond and cubic boron nitride have a high degree of structural similarity: both are face-centered cubic structures, and their unit cell parameters differ by only about 1% (the diamond lattice is: The cubic boron nitride lattice is: ), boron and nitrogen in cubic boron nitride are located on adjacent sides of carbon in the pe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J3/06
CPCB01J3/062B01J2203/062B01J2203/0645B01J2203/0655B01J2203/066B01J2203/0685
Inventor 贺端威王培寇自力
Owner SICHUAN UNIV
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