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Accelerant for synthesizing polycrystalline diamonds and preparation method thereof

A polycrystalline diamond and catalyst technology, applied in chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, etc., can solve inevitable porosity, porosity, component segregation, unfavorable quality Problems such as diamond growth and low material utilization rate can achieve the effect of wide synthesis temperature range, increased synthesis range, and good self-sharpness

Active Publication Date: 2015-07-01
HENAN FAMOUS DIAMOND IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This process has the problems of long process, high energy consumption, and low material utilization rate. At the same time, the contact coal produced inevitably contains defects such as pores, porosity, component segregation, and coarse crystals caused by casting, which is not conducive to the growth of high-quality diamonds.

Method used

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Examples

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Effect test

preparation example Construction

[0016] The preparation method of catalyst for synthesizing polycrystalline diamond of the present invention comprises the following steps:

[0017] 1) Weigh the catalyst raw materials iron, manganese, nickel, silicon and carbon according to the above ratio;

[0018] 2) The raw materials in 1) are prepared into original catalysts by means of water atomization;

[0019] 3) Use a catalyst sieve to select 3 particle sizes of the original catalyst in 2), and the 3 particle sizes are 80 / 100 mesh, 200 / 250 mesh, and 300 / 400 mesh;

[0020] 4) Mix the three particle sizes in 3) in a weight ratio of 1.9-2:2.8-3.1:5-5.3; preferably, mix the three particle sizes in a weight ratio of 2:3:5;

[0021] 5) Put the mixture obtained in 4) into a stainless steel box and bake at 600-680°C for 15-25 minutes to obtain a catalyst for synthesizing polycrystalline diamond.

Embodiment 1

[0024] The raw material formula of the catalyst in this embodiment: iron: 30%, manganese: 30%, nickel: 20%, silicon: 15%, carbon: 5%.

[0025] The preparation method of above-mentioned catalyst is: comprise the following steps:

[0026] 1) Weigh the catalyst raw materials iron, manganese, nickel, silicon and carbon according to the above ratio;

[0027] 2) The raw materials in 1) are prepared into original catalysts by means of water atomization;

[0028] 3) Use a catalyst sieve to select 3 particle sizes of the original catalyst in 2), and the 3 particle sizes are 80 / 100 mesh, 200 / 250 mesh, and 300 / 400 mesh;

[0029] 4) Mix the three particle sizes in 3) according to the weight ratio of 2:3:5;

[0030] 5) Put the mixture obtained in 4) into a stainless steel box and bake at 600°C for 15 minutes to obtain a catalyst for synthesizing polycrystalline diamond.

Embodiment 2

[0032] The raw material formula of the catalyst in this embodiment is: iron: 29%, manganese: 30%, nickel: 20.1%, silicon: 14.9%, carbon: 6%.

[0033] The preparation method of above-mentioned catalyst is: comprise the following steps:

[0034] 1) Weigh the catalyst raw materials iron, manganese, nickel, silicon and carbon according to the above ratio;

[0035] 2) The raw materials in 1) are prepared into original catalysts by means of water atomization;

[0036] 3) Use a catalyst sieve to select 3 particle sizes of the original catalyst in 2), and the 3 particle sizes are 80 / 100 mesh, 200 / 250 mesh, and 300 / 400 mesh;

[0037] 4) Mix the three particle sizes in 3) according to the weight ratio of 2:3:5;

[0038] 5) Put the mixture obtained in 4) into a stainless steel box and bake at 680°C for 24 minutes to obtain a catalyst for synthesizing polycrystalline diamond.

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Abstract

The invention discloses an accelerant for synthesizing polycrystalline diamonds and a preparation method thereof. The accelerant is prepared from the following raw materials in percentage by weight: 29-33.3% of iron, 28-30% of manganese, 19.7-20.1% of nickel, 14-15% of silicon and 5-6% of iron. The invention further discloses the preparation method of the accelerant. The accelerant disclosed by the invention has the beneficial effects that the accelerant for synthesizing polycrystalline diamonds provided by the invention has the advantages of wide range of synthetic pressure and temperature, high per unit yield, short time and easiness in control of synthetic process. The diamonds obtained have the characteristics of irregular shape, less impurity, bottle green color, thermal stability and good self-sharpening property. Meanwhile, in the preparation method of the accelerant, the grain structure of the accelerant is changed, and the synthetic range of the accelerant is increased. Generally, the yield of the accelerant is improved, the raw materials are saved, the production efficiency is improved and the production cost is lowered.

Description

technical field [0001] The invention relates to a catalyst for synthesizing superhard materials, in particular to a catalyst for synthesizing polycrystalline diamond and a preparation method thereof. Background technique [0002] Synthetic diamond is transformed from graphite under ultra-high pressure and high temperature conditions with the participation of catalytic metals. Synthesize high-grade synthetic diamond, use nickel-manganese or nickel-cobalt catalyst in the synthesis environment of ultra-high pressure and high temperature, the current general catalyst is Ni70-Mn25-Go5, convert graphite into single crystal diamond. Single crystal diamond has the defects of high magnetism and low strength, which can no longer meet the market demand. Polycrystalline diamond particles are composed of multiple subcrystals with embedded structures, which have high strength and can better meet the needs of high-end markets at home and abroad. In order to synthesize multiple Crystalline...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/889
Inventor 李建林李淑云王明赵春红李立司蕊
Owner HENAN FAMOUS DIAMOND IND CO LTD
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