Preparation method of strengthened polycrystalline cubic boron nitride composite super-hard material

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

Active Publication Date: 2014-04-30
CHINA UNIV OF GEOSCIENCES (BEIJING) +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] 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 extremely superhard materials, and broadens the application field of superhard materials

Method used

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  • Preparation method of strengthened polycrystalline cubic boron nitride composite super-hard material

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] 1. Use a laser cutting machine to cut cubic boron carbonitride into small square columns of 1×1×4mm.

[0029] 2. Powder configuration:

[0030] Proportion cBN according to the proportion of particle size of 1-2μm, 5-10μm, 20-30μm and its mass proportion is 15%, 25% and 60% respectively; Purify 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.

[0031] 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 mechanically treated in a vacuu...

Embodiment 2

[0036] 1. Use a laser cutting machine to cut boron carbide into small cylinders of Φ1×4mm.

[0037] 2. Powder configuration:

[0038] Proportion cBN according to the proportion of particle size of 1-2μm, 5-10μm, 20-30μm and its mass proportion is 10%, 30% and 60% respectively; Purify 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.

[0039] Mixing Al and SiC in a ratio of 1:1 as a binder, the binder is mechanically treated in a vacuum ball mill, and ball milled for 48h;

[0040] Mix cBN and ad...

Embodiment 3

[0044] 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;

[0045] 2. Powder configuration:

[0046] Proportion cBN according to the proportion of particle size 1-2μm, 5-10μm, 20-30μm and its mass proportion is 12%, 32% and 56% respectively; Purify 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.

[0047] Al, Ti and SiC, Al 4 N 3 According to the weight ratio of 1: 1: 1: 1, it is mixed as an adhesive, ...

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Abstract

The invention discloses a method for preparing a strengthened polycrystalline cubic boron nitride (PCBN) composite super-hard material by adding strengthened phases of super-hard materials such as cubic boron nitride c-BC2N, boron nitride (B4C) and nanometer twin crystal cubic boron nitride (nt-CBN) into a PCBN material, relating to a novel method for synthesizing a super-hard composite material by means of high-temperature and high-pressure sintering, and belongs to the field of super-hard materials. The method comprises the following steps: cutting a super-high-hardness material into a strengthened stem body; burying the strengthened stem body into powder, placing a pyrophyllite block and synthesizing under a high-temperature and high-pressure condition to obtain the PCBN material with a strengthened core. The strengthened PCBN composite super-hard material prepared by using the method has the toughness of PCBN as well as super high hardness which is comparable to that of a natural diamond material. The problems of higher and higher requirements on tools in the modern machining industry and the awkward situation of the application of certain super-high-hardness materials are solved, and the application field of the super-hard material is expanded.

Description

[0001] technical field [0002] 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 [0003] 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. [0004] 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 produ...

Claims

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Application Information

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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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