A preparation method of reinforced polycrystalline cubic boron nitride composite superhard material

A technology of cubic boron nitride and superhard materials, applied in the field of synthesis of polycrystalline cubic boron nitride composite superhard materials, to achieve the effect of broadening the application field

Active Publication Date: 2015-12-30
CHINA UNIV OF GEOSCIENCES (BEIJING) +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved in the present invention is to overcome the defects of the prior art and provide a method for preparing a reinforced polycrystalline cubic boron nitride composite superhard material. The reinforced PCBN composite superhard material prepared by the present invention has the toughness of PCBN , and comparable to the ultra-high hardness of natural diamond materials, it solves the increasingly high requirements of the modern machining industry for cutting tools and the embarrassing situation in the application of some ultra-hard materials, and broadens the application field of super-hard materials

Method used

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  • A preparation method of reinforced polycrystalline cubic boron nitride composite superhard material

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] 1. Use a laser cutting machine to cut cubic boron carbonitride into small square columns of 1×1×4mm.

[0028] 2. Powder configuration:

[0029] Proportion cBN according to the proportion of particle size of 1-2 μm, 5-10 μm, 20-30 μm and its mass proportion is 15%, 25% and 60% respectively; carry out purification treatment on cBN, first carry out alkali treatment and then carry out acid treatment; Alkali treatment is to mix solid NaOH or KOH with cBN according to the weight ratio of 1:1, put it into a muffle furnace, keep it warm at 350°C for 1 hour, and then rinse it with hot water until neutral; acid treatment is to mix alkali Pour the treated cBN into a large volume beaker, add nitric acid 2-3cm higher than cBN and boil for 20 minutes, pour off the nitric acid, add more hydrochloric acid and boil for 20 minutes, wash with distilled water until neutral.

[0030] Al and Al 2 o 3 , SiC is mixed according to the weight ratio of 2:1:1 as an adhesive, and the adhesive is...

Embodiment 2

[0035] 1. Use a laser cutting machine to cut boron carbide into small cylinders of Φ1×4mm.

[0036] 2. Powder configuration:

[0037] Proportion cBN according to the particle size of 1-2μm, 5-10μm, 20-30μm, and its mass proportion is 10%, 30% and 60% respectively; the cBN is purified, first alkali treatment and then acid treatment; Alkali treatment is to mix solid NaOH or KOH with cBN according to the weight ratio of 1:1, put it into a muffle furnace, keep it warm at 350°C for 1 hour, and then rinse it with hot water until neutral; acid treatment is to mix alkali Pour the treated cBN into a large volume beaker, add nitric acid 2-3cm higher than cBN and boil for 20 minutes, pour off the nitric acid, add more hydrochloric acid and boil for 20 minutes, wash with distilled water until neutral.

[0038] Mix Al and SiC in a ratio of 1:1 as a binder, and the binder is mechanically treated in a vacuum ball mill and ball milled for 48 hours;

[0039] Mix cBN and adhesive according to...

Embodiment 3

[0043] 1. Use a laser cutting machine to cut nano-twinned cubic boron nitride into triangular prisms with a side length of 1.2mm and a height of 4mm;

[0044] 2. Powder configuration:

[0045] Proportion cBN according to the particle size of 1-2 μm, 5-10 μm, 20-30 μm, and its mass proportion is 12%, 32% and 56% respectively; the cBN is purified, first alkali treatment and then acid treatment; Alkali treatment is to mix solid NaOH or KOH with cBN according to the weight ratio of 1:1, put it into a muffle furnace, keep it warm at 350°C for 1 hour, and then rinse it with hot water until neutral; acid treatment is to mix alkali Pour the treated cBN into a large volume beaker, add nitric acid 2-3cm higher than cBN and boil for 20 minutes, pour off the nitric acid, add more hydrochloric acid and boil for 20 minutes, wash with distilled water until neutral.

[0046] Al, Ti and SiC, Al 4 N 3 According to the weight ratio of 1:1:1:1, it is mixed as an adhesive, and the adhesive is m...

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Abstract

The invention discloses a method for preparing a reinforced polycrystalline cubic boron nitride composite superhard material. Such as cubic carbon boron nitride c-BC2N, boron carbide (B4C) and nano-twinned cubic boron nitride are added to the PCBN material. The reinforcing phase of superhard materials such as (nt-CBN) is a new method of high temperature and high pressure sintering to synthesize superhard composite materials, which belongs to the field of superhard materials. The steps are: cutting a material with extremely high hardness into reinforced core cylinders, embedding the reinforced core cylinders in the powder, putting pyrophyllite blocks into them, and synthesizing under high temperature and high pressure conditions to obtain PCBN materials with reinforced cores. The strengthened PCBN composite superhard material prepared by the present invention has both the toughness of PCBN and the ultrahigh hardness comparable to natural diamond materials, which solves the increasingly higher requirements of the modern machining industry for cutting tools and the application of some extremely superhard materials. The embarrassing situation in this field has broadened the application field of superhard materials.

Description

technical field [0001] The invention relates to a synthesis method of a polycrystalline cubic boron nitride composite superhard material added with a superhard material reinforcement phase under high temperature and high pressure, belonging to the field of superhard materials. Background technique [0002] Polycrystalline Cubic Boron Nitride (PCBN) is a superhard agglomerate made of fine cubic boron nitride as raw material and a certain amount of binder added under high temperature and high pressure conditions. [0003] Because PCBN has a variety of excellent properties, such as ultra-high hardness and wear resistance, high thermal stability, strong chemical stability and good thermal conductivity, etc., it has a long service life and high processing accuracy. It is widely used in the field of mechanical processing, such as high-precision systems such as CNC machine tools, multi-purpose machine tools, automatic lines, special high-speed machine tools, flexible production uni...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B32/00
Inventor 岳文颜刚王成彪吴宗毅林芳孟德忠付志强
Owner CHINA UNIV OF GEOSCIENCES (BEIJING)
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