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A kind of iron-based powder catalyst for synthesizing ultrafine particle diamond

A technology of ultra-fine particles and iron-based powders, applied in the application of ultra-high pressure process, metal/metal oxide/metal hydroxide catalyst, physical/chemical process catalyst, etc., can solve the problem of high cost and achieve low cost , low temperature, and the effect of improving economic benefits

Inactive Publication Date: 2018-01-05
HEBEI UNIV OF ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The catalyst uses Ni-based metal as the main raw material, although the crystal quality of diamond can be controlled, but the cost is relatively high

Method used

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  • A kind of iron-based powder catalyst for synthesizing ultrafine particle diamond

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Experimental program
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Effect test

Embodiment 1

[0020] In this embodiment, an iron-based powder catalyst for synthesizing ultrafine-grained diamonds comprises 25% by weight of Mn, 15% of Ni, 10% of Zn, and the balance is Fe.

[0021] During preparation, the raw materials are prepared according to the formula, and the prepared raw materials are put into an argon-protected intermediate frequency furnace for melting and refining. The powdered alloy was prepared by high-pressure gas atomization process. The powdered alloy is sieved, and the powdered alloy with a particle size of 400 meshes is selected as a product. The screened powdered alloy is placed in a hydrogen reduction furnace for reduction. The catalyst alloy powder and graphite powder are evenly mixed in a certain proportion, and after high temperature treatment, the diamond is synthesized. The proportion of synthetic diamond particles with a particle size of ≤400 mesh accounts for about 82%, with high crystal integrity and good transparency.

Embodiment 2

[0023] The composition and preparation method of the catalytic alloy are basically the same as those in Example 1, except that the powdered alloy with a particle size of 500 meshes is selected as the product to synthesize diamond by sieving. The proportion of synthetic diamond particles with a particle size of ≤400 mesh accounts for about 85.3%, with high crystal integrity and good transparency.

Embodiment 3

[0025] Its preparation method is basically the same as Example 1, the difference is that, by weight percentage, the catalyst alloy ingredients are: Mn 30%, Ni 10%, Zn 8%, the balance is Fe, and the particle size selected by sieving is 600 mesh powder Shaped alloy is the product of synthetic diamond. The proportion of synthetic diamond particles with a particle size of ≤400 mesh accounts for about 87.6%, with high crystal integrity and good transparency.

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Abstract

The invention discloses an iron-based powder catalyst for synthesizing superfine-grain diamond. The alloy composition thereof is 25%-40% of Mn, 5-15% of Ni, 2-10% of Zn, and the balance is Fe. The invention adopts electronic theory as a guide to select the main components of the catalyst alloy, the product has good sphericity, uniform chemical composition, and the powder yield can reach more than 80% when the particle size is 400-600 mesh. The proportion of diamonds synthesized by the powder catalyst with a particle size of 400 mesh or finer can account for more than 85%, and the diamond crystal has a high integrity rate and good transparency. Compared with the current nickel-based catalyst for synthesizing fine-grained diamonds, the iron-based powder catalyst of the invention can obviously reduce the production cost and has remarkable economic benefits.

Description

technical field [0001] The invention relates to an iron-based powder catalyst for synthesizing ultrafine particle diamond. Background technique [0002] In the industry, diamonds finer than 400 mesh are called ultra-fine diamonds. Compared with diamond single crystals of the same particle size that have been crushed and reshaped, artificially synthesized ultra-fine diamond single crystals with complete crystal shapes have complete crystal shapes and fewer internal defects. It has a series of advantages such as high thermal stability, and has irreplaceable advantages of other materials in semi-finishing, finishing, high-finishing and precision polishing. There are many factors that affect the particle size of synthetic diamond. Among them, the catalyst, as an essential raw material for synthetic diamond, can effectively reduce the synthesis temperature and pressure of diamond, and has a decisive impact on the particle size and performance of diamond. However, the diamond par...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/889B01J3/06
Inventor 李丽王建民高术振
Owner HEBEI UNIV OF ENG
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