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Method for synthesizing gem grade diamond by using cubic press

A technology of six-sided top press and synthetic gemstones, which is applied to the application of ultra-high pressure processes, etc., can solve the problems of explosive hammer caused by expansion stress and large temperature difference, so as to facilitate pressure transmission and small volume expansion rate change , the effect of prolonging the heating time

Inactive Publication Date: 2014-03-05
常熟市怡华金刚石有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

(3) When heated for a long time, the temperature difference between the front and rear ends of the anvil becomes larger, and the expansion stress can easily cause the hammer to explode.

Method used

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  • Method for synthesizing gem grade diamond by using cubic press
  • Method for synthesizing gem grade diamond by using cubic press

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] Synthesize gem-quality diamonds in a six-sided top diamond press with a cavity diameter of 23mm. The synthesis assembly includes:

[0054] Powder compact size: 38mm 3

[0055] High temperature protection tube: wall thickness 5mm, outer diameter 23mm, inner diameter 13mm, height 11.6 mm

[0056] Metal cup: metal molybdenum, wall thickness 0.2mm, outer diameter 13mm, height 11.6mm

[0057] High melting point metal conductive sheet: metal molybdenum, thickness 0.2mm, diameter 23mm

[0058] Composite conductive plug: steel shell: thickness 3mm, outer diameter 23mm, height 13mm

[0059] Alumina ceramic disc: diameter 17mm, thickness 5mm

[0060] Dolomite disc: 17mm in diameter, 5mm in thickness.

[0061] Synthesis conditions: temperature 1450°C (estimated by bismuth filament phase transition); pressure 52000 atmospheres; synthesis time: 55 hours.

[0062] Raw materials: 2.8g W14 diamond powder, 4 iron-nickel catalyst sheets.

[0063] The obtained p...

Embodiment 2

[0065] Synthesize gem-quality diamonds in a six-sided top diamond press with a cavity diameter of 23mm. The synthesis assembly includes:

[0066] Powder compact size: 38mm 3

[0067] High temperature protection tube: wall thickness 5mm, outer diameter 23mm, inner diameter 13mm, height 11.6 mm

[0068] Metal cup: metal molybdenum, wall thickness 0.2mm, outer diameter 13mm, height 11.6mm

[0069] High melting point metal conductive sheet: metal molybdenum, thickness 0.2mm, diameter 23mm

[0070] Composite conductive plug: steel shell: thickness 3mm, outer diameter 23mm, height 13mm

[0071] Alumina ceramic disc: diameter 17mm, thickness 5mm

[0072] Dolomite disc: 17mm in diameter, 5mm in thickness.

[0073] Synthesis conditions: temperature 1450°C (estimated by phase transition of bismuth filaments); pressure 52000 atmospheres; synthesis time: 76 hours.

[0074] Raw materials: 2.8g W14 diamond powder, 4 iron-nickel catalyst sheets.

[0075] The obtain...

Embodiment 3

[0077] Synthesize gem-quality diamonds in a six-sided top diamond press with a cavity diameter of 23mm. The synthesis assembly includes:

[0078] Powder compact size: 38mm 3

[0079] High temperature protection tube: wall thickness 5mm, outer diameter 23mm, inner diameter 13mm, height 11.6 mm

[0080] Metal cup: metal molybdenum, wall thickness 0.2mm, outer diameter 13mm, height 11.6mm

[0081] High melting point metal conductive sheet: metal molybdenum, thickness 0.2mm, diameter 23mm

[0082] Composite conductive plug: steel shell: thickness 3mm, outer diameter 23mm, height 13mm

[0083] Alumina ceramic disc: diameter 17mm, thickness 5mm

[0084] Dolomite disc: 17mm in diameter, 5mm in thickness.

[0085] Synthesis conditions: temperature 1450°C (estimated by bismuth filament phase transition); pressure 52000 atmospheres; synthesis time: 96 hours.

[0086] Raw materials: 2.8g W14 diamond powder, 4 iron-nickel catalyst sheets.

[0087] The obtained p...

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Abstract

The invention discloses a method for synthesizing a gem grade diamond by using a cubic press. The method comprises the steps of using high-quality diamond micro powder with grain size being less than 50 micrometers as raw materials, loading catalysts and the diamond micro powder into a metal cup in a stacking way, densifying under pressure being 200-400MPa, forming an indirect heating-type diamond synthesis assembly, and synthesizing for 20-240h at high temperature being 1450-2000 DEG C and under high pressure being 50000-60000 atmospheric pressure in the cubic press to obtain the gem grade diamond. The diamond synthesis assembly uses metal niobium, tantalum, molybdenum or tungsten to make the metal cup which is also used as a heating element, and aluminum oxide ceramic materials are additionally used for making a high-temperature protection pipe. By forming the indirect heating-type diamond synthesis assembly according to the method disclosed by the invention, the requirements of higher synthesizing temperature and longer heating time can be satisfied, the stability of diamond synthesis technology and equipment by using the cubic press is improved and the synthesis of the gem grade diamond under high pressure and at high temperature is realized.

Description

technical field [0001] The invention relates to a method for synthesizing artificial diamond, in particular to a method for synthesizing gem-grade diamond with a six-sided top diamond press. Background technique [0002] In the industrial production of artificial diamond, high-purity graphite is generally used as raw material, and alloy catalysts (such as alloys formed by Fe, Ni, Mn, Co, etc.) are added to convert graphite into diamond under high temperature and high pressure. According to the existing industrial diamond synthesis process, under the environment of high temperature and high pressure for 30 minutes, the particle size of the diamond synthesized by iron-nickel powder catalyst is about 100 microns. According to the theory of constant crystal growth, if the diamond with a diameter of 3 mm is grown by prolonging the synthesis time, the required synthesis time is 30 hours. But in fact, because the crystal growth is not constant, with the increase of the crystal par...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J3/06
Inventor 李坤李政杨青松沈建民俞建名
Owner 常熟市怡华金刚石有限公司
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