Femn-based powder catalyst containing rare earth additives for synthetic diamond

A rare earth additive, artificial synthesis technology, applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problem of high cost of catalyst materials and reduce the overall production cost , The effect of reducing top hammer consumption and strengthening market competitiveness

Inactive Publication Date: 2011-12-28
石门县顺超科技发展有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The chemical composition of the above powder catalyst patents is NiMn-based or FeNi-based, containing a relatively high proportion of Ni, so the cost of catalyst materials is relatively high

Method used

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  • Femn-based powder catalyst containing rare earth additives for synthetic diamond
  • Femn-based powder catalyst containing rare earth additives for synthetic diamond
  • Femn-based powder catalyst containing rare earth additives for synthetic diamond

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] A FeMn-based powder catalyst containing rare earth additives in this embodiment has an alloy composition of 28.9% Mn, 0.16% C, 0.36% Ce, and the balance is Fe. The powder preparation method is as follows:

[0024] 1. Weigh Fe, Mn, C, and rare earth Ce according to the proportion specified in the formula, and use an intermediate frequency induction furnace to melt and make ingots under the protection of an inert gas. Considering the volatility of Mn and rare earth Ce, they should be added at the later stage of melting. The melting temperature of the ingredients is about At 1450-1480°C, add Mn and Ce to melt and keep it for about 5 minutes, and then cast it into an ingot.

[0025] 2. Remelt the alloy ingot at 1450-1650°C. During the melting process, pass through argon gas protection for 8-10 minutes. Finally, use high-pressure nitrogen gas (pressure 3.0-4.5Mpa) to crush and atomize the metal liquid flow into powder.

[0026] The catalyst powder of the formula was prepar...

Embodiment 2

[0029] The preparation equipment and operation method of the powder catalyst are the same as in Example 1, except that, by mass percentage, the ingredients of the catalyst alloy are 38.6% Mn, 0.16% C, 0.54% Ce, and the balance is Fe. The measured oxygen content of the catalyst powder was 218 ppm, and the nitrogen content was 120 ppm.

[0030] After sieving the alloy powder, take -200 mesh catalyst powder and graphite powder and mix uniformly at a ratio of 4:6 to prepare a synthetic rod. Also use a ∮39mm cavity at a pressure of about 5.2Gpa, a temperature above 1450°C, and heat for about 20 minutes The diamond synthesis was carried out under the specified time, and the particle size analysis and static pressure strength, TI, and TTI performance tests of the obtained diamond were carried out. The test results are shown in Table 1.

Embodiment 3

[0032] The preparation equipment and operation method of the powder catalyst are basically the same as in Example 1, except that, by mass percentage, the ingredients of the catalyst alloy are 38.5% Mn, 0.16% C, 0.76% Ce, and the balance is Fe. The measured oxygen content of the catalyst powder was 230 ppm, and the nitrogen content was 128 ppm.

[0033] After sieving the alloy powder, take -200 mesh catalyst powder and graphite powder and mix uniformly at a ratio of 4:6 to prepare a synthetic rod. Also use a ∮39mm cavity at a pressure of about 5.2Gpa, a temperature above 1450°C, and heat for about 20 minutes The diamond synthesis was carried out under the specified time, and the particle size analysis and static pressure strength, TI, and TTI performance tests of the obtained diamond were carried out. The results are shown in Table 1.

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Abstract

A FeMn-based powder catalyst containing rare earth additives for artificial synthetic diamond, its alloy composition is 28-40% Mn, 0-10% Ni, 0-5% Co, 0.1-0.5% C, 0.01- 1.0% rare earth additive, 50-800ppm O, 50-500ppm N, the balance is Fe, wherein the rare earth additive can choose one of Ce, La and Er. The preferred powder catalyst product of the present invention has an oxygen content of ≤300ppm, a nitrogen content of ≤150ppm, and is prepared by an inert gas gas atomization process. The catalyst powder is spherical or nearly spherical, and the alloy composition is uniform. The diamond synthesized by this catalyst has a mixed unit yield of ∮39mm cavity as high as 105 carats / block, the proportion of static pressure strength higher than 20kg is greater than 40%, the proportion of 35 / 60 particle size range in diamond is more than 76%, and the TI and TTI values Higher, better thermal stability and better wear resistance, it is an ideal raw material for making high-efficiency diamond abrasive tools.

Description

technical field [0001] The invention belongs to the technical field of catalyst materials for synthetic diamond, in particular to a FeMn-based powder catalyst containing rare earth additives. Background technique [0002] Synthetic diamond is converted from graphite by using graphite as a carbon source, using high temperature and high pressure equipment, and under the catalytic action of a catalyst (an alloy composed of elements such as Fe, Ni., Co, Mn). Common catalyst materials include flakes and powders. Due to its large specific surface area, high graphite conversion rate, high synthesis yield, uniform chemical composition, low diamond production cost, the synthesized diamond has high crystal integrity, relatively pure crystal, low inclusion content, good color, and diamond cold. , High thermal shock toughness, good thermal stability, high yield of high-strength diamond, etc., have been widely used by enterprises. The quality and output of diamond synthesis are mainly ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/889B01J23/83B01J35/08C01B31/06
Inventor 徐骏赵文东朱学新郭宏李成栋赵新明
Owner 石门县顺超科技发展有限公司
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