Polycrystalline diamond superhard material and preparation method thereof

A technology for polycrystalline diamond and superhard material, which is applied in the field of polycrystalline diamond superhard material and its preparation, can solve the problems of poor phase transformation of diamond and affect the thermal stability of polycrystalline diamond material, and achieves the effect of a simple preparation method

Inactive Publication Date: 2018-01-19
SF DIAMOND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, as the temperature continues to rise, the metal catalyst will also cause the diamond to undergo unfavorable phase transitions (such as carbon monoxide, carbon dioxide or graphite), which will affect the thermal stability of the polycrystalline diamond material, making polycrystalline diamond in practical applications. The use temperature of crystalline diamond material is limited to about 750°C

Method used

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  • Polycrystalline diamond superhard material and preparation method thereof
  • Polycrystalline diamond superhard material and preparation method thereof
  • Polycrystalline diamond superhard material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] A polycrystalline diamond superhard material obtained through the following preparation process:

[0038] (1) Raw material preparation

[0039] Mix cubic boron nitride single crystal powder and diamond single crystal powder with an average particle size of 1 micron in a mass ratio of 10:90, and gently grind and mix them with a grinding rod and an appropriate amount of alcohol in a mortar After mixing for about 4 hours, dry the powder after the alcohol volatilizes, weigh 1g of the mixed raw material, put the weighed raw material powder into the metal molybdenum cup, then put the metal molybdenum cup into the mold and press the powder Pre-compression molding is carried out on the tablet machine, the applied pressure is 8MPa, the holding time is 300s, and the size of the molybdenum cup after pre-compression is Φ13*5.0 / mm;

[0040] (2) Impurity removal

[0041] Heat-treat the metal molybdenum cup containing the powder raw material that has been pre-pressed in (1) at 900°C...

Embodiment 2

[0047] (1) Raw material preparation

[0048]Cubic boron nitride single crystal powder and diamond single crystal powder with an average particle size of 0.5 microns are mixed according to a mass ratio of 20:80, and gently ground and mixed with a grinding rod and an appropriate amount of alcohol in a mortar After mixing for about 4 hours, dry the powder after the alcohol volatilizes, weigh 1g of the mixed raw material, put the weighed raw material powder into the metal molybdenum cup, then put the metal molybdenum cup into the mold and press the powder Pre-compression molding is carried out on the tablet machine, the applied pressure is 8MPa, the holding time is 300s, and the size of the molybdenum cup after pre-compression is Φ13*5.0 / mm;

[0049] (2) Impurity removal

[0050] Heat-treat the metal molybdenum cup containing the powder raw material that has been pre-pressed in (1) at 1000°C to remove impurities contained in the powder raw material;

[0051] (3) Ultra-high press...

Embodiment 3

[0056] (1) Raw material preparation

[0057] Cubic boron nitride single crystal powder with an average particle size of 1 micron and diamond single crystal powder with an average particle size of 0.5 micron are mixed according to a mass ratio of 40:60, and mixed with a grinding rod in a mortar. Gently grind and mix an appropriate amount of alcohol. After mixing for about 4 hours, dry the powder after the alcohol volatilizes. Weigh 1g of the mixed raw material, put the weighed raw material powder into the metal molybdenum cup, and then put the metal molybdenum cup into the In the mold and on the powder tablet press for pre-compression molding, the applied pressure is 8MPa, the holding time is 300s, and the size of the molybdenum cup after pre-compression is Φ13*5.0 / mm;

[0058] (2) Impurity removal

[0059] Heat-treat the metal molybdenum cup containing the powder raw material that has been pre-pressed in (1) at 1000°C to remove impurities contained in the powder raw material;...

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Abstract

Belonging to the technical field of superhard materials, the invention in particular relates to a polycrystalline diamond superhard material with polycrystalline cubic boron nitride as the binder anda preparation method thereof. The superhard material is formed by combination of submicron scale single-crystal cubic boron nitride grains and single-crystal diamond grains, wherein the single-crystalcubic boron nitride grains form polycrystalline cubic boron nitride during sintering, and the polycrystalline cubic boron nitride acts as a binder for bonding with diamond particles together. The polycrystalline diamond superhard material with polycrystalline cubic boron nitride as the binder has both the high hardness of diamond and the inertness of cubic boron nitride to iron family elements. The preparation method is simple, the required temperature and pressure ranges are slightly higher than conventional products, and can be achieved by adjusting the assembly scheme properly, therefore the method is suitable for industrialized production.

Description

technical field [0001] The invention belongs to the technical field of superhard materials, in particular to a polycrystalline diamond superhard material using polycrystalline cubic boron nitride as a binder and a preparation method thereof. Background technique [0002] Polycrystalline diamond material is a superhard material with good wear resistance and hardness. It is commonly used in industrial applications as cutting tools and wear-resistant tools, as well as in underground mining and drilling applications. [0003] In order to synthesize polycrystalline diamond materials, it is necessary to sinter diamond particles under high temperature and high pressure conditions to obtain superhard polycrystalline materials. Catalyst materials need to be added to the mixture of diamond particles before sintering, so as to promote the formation of polycrystalline diamond structure during high temperature and high pressure sintering. The choice of catalyst is usually metals in grou...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/52C04B35/626
Inventor 陈金兰方海江马姗姗赵东鹏
Owner SF DIAMOND CO LTD
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