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Ultrahigh hard nano twin diamond block material and preparation method thereof

A bulk material and nano-twin technology, applied in the field of superhard materials, can solve the problems of poor thermal stability and low hardness of diamond polycrystalline, and achieve the effect of easy control of parameters and simple process

Active Publication Date: 2014-12-17
YANSHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] But due to the presence of binders, the hardness (50-70GPa) of this polycrystalline diamond is low and the thermal stability is poor

Method used

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  • Ultrahigh hard nano twin diamond block material and preparation method thereof
  • Ultrahigh hard nano twin diamond block material and preparation method thereof
  • Ultrahigh hard nano twin diamond block material and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0078] (1) Preparation of high-temperature and high-pressure raw materials: Spherical carbon (onion structure) powder (particle size: 5-30nm) is placed in a nitrogen-protected glove box and pressed into a block with a diameter of 1.6mm and a length of 3mm, and it is sealed in a difficult-to-contain Reserve in a metal Re crucible.

[0079] (2) High temperature and high pressure synthesis: put the above-mentioned pre-pressed block into a hexagonal boron nitride crucible, and then put it into a high temperature and high pressure assembly block (such as figure 2 shown), put the assembly block into a T25 (or cube) ultra-high pressure high temperature synthesis device, and heat it for 30 minutes at a pressure of 15 GPa and a temperature of 1850 ° C. The prepared nano-twinned diamond block is as follows image 3 As shown, the density of the nano-twinned diamond block is 3.5±0.1(g / cm 3 ).

[0080] (3) Properties of the nano-twinned diamond block: the X-ray diffraction spectrum of t...

Embodiment 2

[0082] (1) Preparation of high-temperature and high-pressure raw materials: Spherical carbon (onion structure) powder (particle size: 5-30nm) is placed in a nitrogen-protected glove box and pressed into a block with a diameter of 1.6mm and a length of 3mm, which is sealed in a difficult Put it in a metal hot crucible for later use.

[0083] 2) High temperature and high pressure synthesis: put the above pre-pressed block into a hexagonal boron nitride crucible and a high temperature and high pressure assembly block, and then put it into a T25 or cubic ultra-high pressure high temperature synthesis device, and heat it under 15GPa pressure and 2000°C for 30 minutes to prepare The formed nano-twinned diamond block such as Figure 8 shown.

[0084] (3) Properties of the nano-twinned diamond block: the X-ray diffraction spectrum (XRD) of the prepared nano-twinned diamond block is as follows Figure 9 As shown, its phase composition is pure phase cubic diamond, and the average grai...

Embodiment 3

[0086] (1) Preparation of high-temperature and high-pressure raw materials: Spherical carbon (onion structure) powder (particle size: 5-30nm) is placed in a nitrogen-protected glove box and pressed into a block with a diameter of 1.6mm and a length of 3mm, which is sealed in a difficult Put it in a metal hot crucible for later use.

[0087] (2) High-temperature and high-pressure synthesis: put the above-mentioned pre-pressed block into a hexagonal boron nitride crucible, then put it into a high-temperature and high-pressure assembly block, and then put it into a T25 or cubic ultra-high-pressure high-temperature synthesis device, under the conditions of 12GPa pressure and 1850°C Heating for 30 minutes, the prepared nano-twinned diamond block is as Figure 11 shown.

[0088] (3) Properties of the nano-twinned diamond block: the X-ray diffraction spectrum (XRD) of the prepared nano-twinned diamond block is as follows Figure 12 As shown, its phase composition is pure phase cubi...

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Abstract

The invention relates to an ultrahigh hard nano twin diamond block material and a preparation method thereof, and specifically discloses a nanocrystalline diamond block material containing high density twin crystals and a synthesis method thereof. Particles of nano spherical carbon without a diamond core (carbon with an onion structure is named as coreless onion carbon for short) are taken as the raw materials and then subjected to synthesis under a high pressure at a high temperature to obtain nano twin diamond blocks. The volume of obtained nano twin diamond block is 1-2000 mm3; the Vickers hardness is 155-350 GPa, the Knoop hardness is 140-240 GPa, and the twin width is 1-15 nm. Compared to the prior art, the hardness of the obtained nano twin diamond blocks is far higher than the hardness of diamond mono-crystal and ultrahigh hard polycrystalline diamond, wherein the Vickers hardness of diamond mono-crystal is just around 100 GPa, the highest Knoop hardness of ultrahigh polycrystalline diamond is 140 GPa, while the highest Vickers hardness of the nano twin diamond blocks can reach 350 GPa, and the highest Knoop hardness of the nano twin diamond blocks can reach 240 GPa. The nano twin diamond block has a wide application prospect in the machinery processing field such as geological drilling, high speed cutting, ultra precision processing, and the like, the grinding material and grinding tool field, the wire-drawing die field, and the special optical element field.

Description

technical field [0001] The invention relates to the field of superhard materials, in particular to an ultrahigh hardness nano-twinned diamond block material and a preparation method thereof. Background technique [0002] Diamond, also known as diamond, is not only a dazzling jewelry, but also a superhard material that is difficult to replace in industry because of its highest hardness among natural materials. Therefore, diamond is the hardest substance in nature and is known as the "King of Hardness". In addition to its ultra-high hardness, diamond also has excellent physical properties such as heat sensitivity, heat conduction, and semiconductor, which makes diamonds widely used, such as: handicrafts, semiconductor devices, drill bits for geological drilling, cutting and grinding in industry sharpening tools etc. However, due to the anisotropy of mechanical properties and the existence of cleavage planes, single crystal diamond encounters bottlenecks in practical applicat...

Claims

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Application Information

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IPC IPC(8): B01J3/06
Inventor 田永君黄权于栋利徐波何巨龙柳忠元胡文涛赵智胜
Owner YANSHAN UNIV
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