Synthesis process of ultrafine-grade diamond

A synthesis process and diamond technology, which is applied in the field of ultrafine diamond synthesis process, can solve the problems of no crystal shape, limited application range, and influence on mechanical properties of crystals, and achieve the effect of less impurities, consistent crystal form, and large nucleation amount

Inactive Publication Date: 2014-06-11
周存文
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the particle size of domestically synthesized fine-grained diamonds is generally greater than 200 mesh, and the proportion of single crystals is low, generally 30%-40%; fine-grained crystals smaller than 200 mesh are generally obtained by crushing coarse-grained diamonds. It is time-consuming and labor-intensive, and the obtained crystals do not have a complete crystal form, so that their mechanical properties are also seriously affected, and ultimately their application range is limited

Method used

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  • Synthesis process of ultrafine-grade diamond
  • Synthesis process of ultrafine-grade diamond

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Embodiment 1 Concrete synthetic steps are:

[0048] ① Take 400 mesh finer graphite powder and Fe-based alloy catalyst powder and mix them in a weight ratio of 8:5. The components and contents of the Fe-based alloy catalyst powder are calculated by weight percentage: Si: 0.5%, B: 0.2%, Cu: 6%, Zn: 3%, dispersant: 0.5%, the balance is Fe;

[0049] ②Put the raw material obtained in step ① into a three-dimensional mixer and mix for 2 hours. After isostatic pressing at 220MPa, crush it into particles smaller than 90 meshes to obtain the mixed material;

[0050] ③Put the mixed material into the mold, and then press it into a columnar stem on a four-column press. The size of the stem: Φ40mm×31.5mm, the density of the stem: 3.5g / cm 3 , put the formed core column into a vacuum furnace, vacuum treatment at 1000°C, fully remove oxygen, and cool down to room temperature naturally;

[0051] ④ Put the core column into the diamond synthesis block, and then put the diamond synthe...

Embodiment 2

[0057] Embodiment 2 Concrete synthetic steps are:

[0058] ① Take 400 mesh finer graphite powder and Fe-based alloy catalyst powder and mix them in a weight ratio of 8:7. The components and contents of the Fe-based alloy catalyst powder are calculated by weight percentage: Si: 1.7%, B: 1.4%, Cu: 7%, Zn: 7%, dispersant: 1%, the balance is Fe;

[0059] ②Put the raw material obtained in step ① into a three-dimensional mixer and mix for 2 hours. After isostatic pressing at 280MPa, crush it into particles smaller than 90 meshes to obtain the mixed material;

[0060] ③Put the mixed material into the mold, and then press it into a columnar core column on a four-column press. The size of the core column: Φ40mm×31.5mm, the density of the core column: 3.8g / cm 3 , put the formed core column into a vacuum furnace, vacuum treatment at 1000°C, fully remove oxygen, and cool down to room temperature naturally;

[0061] ④Put the core column into the diamond synthesis block, and then put ...

Embodiment 3

[0067] Embodiment 3 Concrete synthetic steps are:

[0068] ① Take 400 mesh finer graphite powder and Fe-based alloy catalyst powder and mix them in a weight ratio of 8:6. The composition and content of the Fe-based alloy catalyst powder are calculated by weight percentage: Si: 1.1%, B: 0.8%, Cu: 6.5%, Zn: 5%, dispersant: 0.75%, the balance is Fe;

[0069] ② Put the raw materials obtained in step ① into a three-dimensional mixer and mix them for 2 hours. After isostatic pressing at 250 MPa, they are crushed into particles smaller than 90 meshes to obtain the mixed materials;

[0070] ③Put the mixed material into the mold, and then press it into a columnar core column on a four-column press. The size of the core column: Φ40mm×31.5mm, the density of the core column: 3.7g / cm 3 , put the formed core column into a vacuum furnace, vacuum treatment at 1000°C, fully remove oxygen, and cool down to room temperature naturally;

[0071] ④ Put the core column into the diamond synthesis b...

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Abstract

The invention provides a synthesis process of ultrafine-grade diamond. The synthesis process comprises the steps: after mixing a graphite powder and an Fe-based alloy catalyst powder according to the weight ratio of 8:5-7, carrying out isostatic pressing treatment and vacuum treatment, then carrying out press forming in a four-column pressing machine, followed by putting the column core into a diamond synthetic block, next putting the diamond synthetic block into a six-side jacking press machine, and synthesizing, wherein the actual synthesis pressure is 6.1-6.6 GPa, the synthesis temperature is 1000-1100 DEG C, and the actual synthesis pressure and the synthesis temperature are completed respectively by adopting a control pressure curve and a power curve. The synthesized diamond with micron-sized fine particles has the characteristics of large nucleation amount, short growth time and the like; the product meets national artificial diamond standards, has the advantages of consistent crystal form, integral crystal faces, less impurities and high heat flush value, has the particle granularity with peak values of 270 / 325 and 325 / 400, allows the single crystal ratio to reach 70-80%, and can effectively meet the fields of high-end abrasive tools and the like having extremely high requirements on the particle fineness.

Description

technical field [0001] The invention relates to the field of diamond synthesis, in particular to an ultrafine diamond synthesis process. Background technique [0002] At present, with the continuous progress of synthesis technology, the quality of synthetic diamond single crystal is getting higher and higher. In the use of diamond tools, artificial micron-sized fine-grained diamond is a new type of ultra-hard ultra-fine abrasive, which is widely used in the fields of machinery, electronics, aerospace and military industry, and is ideal for grinding and polishing cemented carbide, ceramics, gemstones, optics, etc. Ideal material for high hardness materials such as glass. [0003] At present, the particle size of domestically synthesized fine-grained diamonds is generally greater than 200 mesh, and the proportion of single crystals is low, generally 30%-40%; fine-grained crystals smaller than 200 mesh are generally obtained by crushing coarse-grained diamonds. It is time-co...

Claims

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Application Information

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IPC IPC(8): B01J3/06
Inventor 周存文
Owner 周存文
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